/* DeepMath - Clean Professional Design System */

/* CSS Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Root Variables */
:root {
    /* Custom Brand Colors - Used as Accents */
    --color-primary: #5F6366;
    --color-secondary: #4D6D9A;
    --color-tertiary: #86B3D1;
    --color-quaternary: #99CED3;
    --color-accent: #EDB5BF;
    
    /* Base Colors */
    --color-white: #ffffff;
    --color-black: #000000;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    
    /* Semantic Colors */
    --color-background: #FBF8F1;
    --color-surface: #FBF8F1;
    --color-surface-elevated: var(--color-white);
    --color-border: var(--color-gray-200);
    --color-border-light: var(--color-gray-100);
    
    /* Text Colors */
    --color-text-primary: var(--color-gray-900);
    --color-text-secondary: var(--color-gray-600);
    --color-text-tertiary: var(--color-gray-400);
    
    /* Typography */
    --font-family-sans: 'Perpetua', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', '微软雅黑', 'SimSun', '宋体', Georgia, 'Times New Roman', serif;
    --font-family-mono: 'SF Mono', Monaco, 'Inconsolata', 'Roboto Mono', 'Source Code Pro', monospace;
    
    /* Font Sizes */
    --font-size-xs: 1rem;       /* 16px */
    --font-size-sm: 1.125rem;   /* 18px */
    --font-size-base: 1.25rem;  /* 20px */
    --font-size-lg: 1.375rem;   /* 22px */
    --font-size-xl: 1.5rem;     /* 24px */
    --font-size-2xl: 1.875rem;  /* 30px */
    --font-size-3xl: 2.25rem;   /* 36px */
    --font-size-4xl: 2.75rem;   /* 44px */
    --font-size-5xl: 3.5rem;    /* 56px */
    --font-size-6xl: 4.25rem;   /* 68px */
    
    /* Line Heights */
    --line-height-tight: 1.25;
    --line-height-snug: 1.375;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    --line-height-loose: 2;
    
    /* Font Weights */
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* Base Styles */
html {
    line-height: var(--line-height-normal);
    -webkit-text-size-adjust: 100%;
    font-family: var(--font-family-sans);
}

body {
    margin: 0;
    font-family: var(--font-family-sans);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    width: 100%;
    max-width: 1600px;
    margin: 0 auto;
    padding-left: var(--space-6);
    padding-right: var(--space-6);
}

@media (max-width: 768px) {
    .container {
        padding-left: var(--space-4);
        padding-right: var(--space-4);
    }
}

/* Promotional Banner */
.promo-banner {
    background-color: var(--color-secondary);
    color: var(--color-white);
    padding: var(--space-3) 0;
    text-align: center;
    position: relative;
    z-index: 50;
}

.promo-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-6);
    flex-wrap: wrap;
}

.promo-text {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.promo-cta {
    background-color: rgba(255, 255, 255, 0.2);
    color: var(--color-white);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    transition: all 0.2s ease-in-out;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.promo-cta:hover {
    background-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-1px);
}

/* Navigation */
.navbar {
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    position: static;
    width: 100%;
    z-index: 40;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.nav-brand h1 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin: 0;
}

.nav-brand a {
    text-decoration: none;
    color: inherit;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-8);
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-menu a {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 0.2s ease-in-out;
}

.nav-menu a:hover {
    color: var(--color-secondary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.language-selector {
    position: relative;
}

.language-selector select {
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-background);
    color: var(--color-text-primary);
    font-family: var(--font-family-sans);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=US-ASCII,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 4 5'><path fill='%235F6366' d='M2 0L0 2h4zm0 5L0 3h4z'/></svg>");
    background-repeat: no-repeat;
    background-position: right 8px center;
    background-size: 12px;
    padding-right: var(--space-6);
}

.language-selector select:hover {
    border-color: var(--color-secondary);
    background-color: var(--color-surface);
}

.language-selector select:focus {
    outline: none;
    border-color: var(--color-secondary);
    box-shadow: 0 0 0 3px rgba(77, 109, 154, 0.1);
}

.nav-login {
    padding: var(--space-2) var(--space-4);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    transition: all 0.2s ease-in-out;
}

.nav-login:hover {
    background-color: var(--color-surface);
    border-color: var(--color-secondary);
}

.nav-signup {
    padding: var(--space-2) var(--space-4);
    background-color: var(--color-secondary);
    color: var(--color-white);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    transition: all 0.2s ease-in-out;
}

.nav-signup:hover {
    background-color: var(--color-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: var(--space-2);
}

.hamburger span {
    width: 20px;
    height: 2px;
    background-color: var(--color-text-primary);
    margin: 2px 0;
    transition: 0.3s;
    border-radius: 1px;
}

/* Hero Section */
.hero {
    padding: var(--space-24) 0;
    background-color: var(--color-background);
    position: relative;
}

.hero-content {
    text-align: center;
    max-width: 1200px;
    margin: 0 auto;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--color-text-primary);
    margin-bottom: var(--space-8);
    letter-spacing: -0.025em;
}

.hero-video-container {
    max-width: 900px;
    margin: 0 auto var(--space-12);
}

.video-placeholder {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-20) var(--space-12);
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease-in-out;
    min-height: 400px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.video-placeholder:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-secondary);
}

.play-button {
    width: 100px;
    height: 100px;
    background-color: var(--color-secondary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-8);
    font-size: var(--font-size-3xl);
    color: var(--color-white);
    transition: all 0.3s ease-in-out;
    box-shadow: var(--shadow-md);
}

.video-placeholder:hover .play-button {
    background-color: var(--color-primary);
    transform: scale(1.1);
}

.video-info h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.video-info p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
}

.hero-actions {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-6);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-family-sans);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    min-height: 44px;
}

.btn-primary {
    background-color: var(--color-secondary);
    color: var(--color-white);
}

.btn-primary:hover {
    background-color: var(--color-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--color-white);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background-color: var(--color-surface);
    border-color: var(--color-secondary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-secondary);
    border: 1px solid var(--color-secondary);
}

.btn-outline:hover {
    background-color: var(--color-secondary);
    color: var(--color-white);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-large {
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-base);
    min-height: 52px;
}

/* Section Styles */
.section-title {
    font-size: var(--font-size-5xl);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    text-align: center;
    color: var(--color-text-primary);
    margin-bottom: var(--space-6);
    letter-spacing: -0.025em;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.section-subtitle {
    font-size: var(--font-size-xl);
    line-height: var(--line-height-relaxed);
    text-align: center;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-12);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* Problems Section */
.problems-section {
    padding: var(--space-12) 0;
    background-color: var(--color-background);
}

/* Why Choose Section */
.why-choose-section {
    padding: var(--space-20) 0;
    background-color: var(--color-background);
}

.why-choose-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-8);
    margin: var(--space-12) 0;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.why-choose-card {
    background-color: var(--color-white);
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
    transition: all 0.3s ease-in-out;
    display: flex;
    gap: var(--space-6);
    align-items: flex-start;
}

.why-choose-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-secondary);
}

.why-choose-icon {
    width: 80px;
    height: 80px;
    background-color: var(--color-secondary);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    color: var(--color-white);
    flex-shrink: 0;
    box-shadow: var(--shadow-md);
}

.why-choose-content h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-3);
    line-height: var(--line-height-tight);
}

.why-choose-content p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    margin: 0;
}

.trust-indicators {
    display: flex;
    justify-content: center;
    gap: var(--space-12);
    margin-top: var(--space-16);
    padding: var(--space-8) 0;
    background-color: var(--color-surface);
    border-radius: var(--radius-xl);
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.trust-item {
    text-align: center;
}

.trust-number {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-secondary);
    line-height: var(--line-height-tight);
    margin-bottom: var(--space-2);
}

.trust-label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

@media (max-width: 768px) {
    .why-choose-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
    
    .why-choose-card {
        flex-direction: column;
        text-align: center;
        gap: var(--space-4);
    }
    
    .why-choose-icon {
        width: 60px;
        height: 60px;
        font-size: var(--font-size-xl);
        margin: 0 auto;
    }
    
    .trust-indicators {
        flex-direction: column;
        gap: var(--space-6);
    }
    
    .trust-number {
        font-size: var(--font-size-3xl);
    }
}

.problems-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-8);
    margin-top: var(--space-12);
}

.problem-card {
    background-color: var(--color-white);
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    transition: all 0.3s ease-in-out;
}

.problem-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.problem-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-6);
}

.problem-card:nth-child(1) .problem-icon {
    background-color: var(--color-secondary);
}

.problem-card:nth-child(2) .problem-icon {
    background-color: var(--color-tertiary);
}

.problem-card:nth-child(3) .problem-icon {
    background-color: var(--color-quaternary);
}

.problem-card:nth-child(4) .problem-icon {
    background-color: var(--color-accent);
}

.problem-card:nth-child(5) .problem-icon {
    background-color: var(--color-primary);
}

.problem-card:nth-child(6) .problem-icon {
    background-color: var(--color-tertiary);
}

.problem-card h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
}

.problem-card p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-6);
    font-style: italic;
}

.solution {
    padding: var(--space-4);
    background-color: var(--color-surface);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-quaternary);
}

.solution strong {
    color: var(--color-text-primary);
    font-weight: var(--font-weight-semibold);
}

/* Testimonials Section */
.testimonials-section {
    padding: 0 0 var(--space-12) 0;
    margin-top: -1rem;
    background-color: var(--color-surface);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-8);
    margin-top: var(--space-12);
}

.testimonial-card {
    background-color: var(--color-white);
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    transition: all 0.3s ease-in-out;
}

.testimonial-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.quote-icon {
    width: 40px;
    height: 40px;
    background-color: var(--color-secondary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-size: var(--font-size-base);
    margin-bottom: var(--space-4);
}

.testimonial-card blockquote {
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-primary);
    margin-bottom: var(--space-6);
}

.testimonial-author {
    border-top: 1px solid var(--color-border);
    padding-top: var(--space-4);
}

.testimonial-author strong {
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    display: block;
    margin-bottom: var(--space-1);
}

.testimonial-author span {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    display: block;
    margin-bottom: var(--space-2);
}

.rating {
    color: var(--color-accent);
    font-size: var(--font-size-sm);
}

/* Testimonials Stats */
.testimonials-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-8);
    margin-top: var(--space-16);
    padding: var(--space-12) var(--space-8);
    background-color: var(--color-white);
    border-radius: var(--radius-xl);
    text-align: center;
    box-shadow: var(--shadow-md);
}

.stat-item .stat-number {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-secondary);
    display: block;
    margin-bottom: var(--space-2);
    line-height: 1;
}

.stat-item .stat-label {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-1);
}

.stat-item .stat-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* Benefits Section */
.benefits-section {
    padding: var(--space-12) 0;
    background-color: var(--color-background);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-8);
    margin-top: var(--space-12);
}

.benefit-card {
    background-color: var(--color-white);
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    text-align: center;
    transition: all 0.3s ease-in-out;
}

.benefit-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.benefit-icon {
    width: 64px;
    height: 64px;
    background-color: var(--color-secondary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-6);
    color: var(--color-white);
    font-size: var(--font-size-xl);
}

.benefit-card h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
}

.benefit-card p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-4);
}

.benefit-features {
    display: flex;
    justify-content: center;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.badge {
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-primary {
    background-color: var(--color-secondary);
    color: var(--color-white);
}

.badge-success {
    background-color: var(--color-quaternary);
    color: var(--color-white);
}

/* Pricing Preview Section */
.pricing-preview {
    padding: var(--space-12) 0;
    background-color: var(--color-surface);
}

.pricing-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
    margin-top: var(--space-12);
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

@media (max-width: 900px) {
    .pricing-cards {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-6);
    }
}

@media (max-width: 768px) {
    .pricing-cards {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
}

.pricing-card {
    background-color: var(--color-white);
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    text-align: center;
    position: relative;
    transition: all 0.3s ease-in-out;
}

.pricing-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
    border: 2px solid var(--color-secondary);
    transform: scale(1.02);
}

.featured-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--color-secondary);
    color: var(--color-white);
    padding: var(--space-1) var(--space-4);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
}

.pricing-card h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
}

.price {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-secondary);
    margin-bottom: var(--space-4);
    line-height: 1;
}

.price span {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-normal);
}

.pricing-card p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-8);
    line-height: var(--line-height-relaxed);
}

.pricing-family-note {
    text-align: center;
    margin-top: var(--space-8);
    padding: var(--space-4);
    background-color: rgba(134, 179, 209, 0.1);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-tertiary);
}

.pricing-family-note p {
    margin: 0;
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
}

.pricing-family-note i {
    margin-right: var(--space-2);
    color: var(--color-tertiary);
}

/* CTA Section */
.cta-section {
    padding: var(--space-12) 0;
    background-color: var(--color-background);
    text-align: center;
}

.cta-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
    line-height: var(--line-height-tight);
}

.cta-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-8);
    line-height: var(--line-height-relaxed);
}

.cta-pricing {
    margin: var(--space-12) 0;
}

.price-highlight {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: var(--space-4);
}

.price-amount {
    font-size: var(--font-size-5xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    line-height: 1;
    margin-bottom: var(--space-2);
}

.price-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
}

.price-comparison {
    margin-top: var(--space-2);
}

.comparison-text {
    font-size: var(--font-size-base);
    color: var(--color-text-tertiary);
    text-decoration: line-through;
}

.cta-actions {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    margin: var(--space-12) 0;
    flex-wrap: wrap;
}

.cta-guarantee {
    margin-top: var(--space-8);
}

.cta-guarantee p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    flex-wrap: wrap;
}

/* Footer */
.footer {
    background-color: var(--color-gray-900);
    color: var(--color-white);
    padding: var(--space-16) 0 var(--space-8);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-8);
    margin-bottom: var(--space-8);
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: var(--space-4);
    font-weight: var(--font-weight-semibold);
}

.footer-section a {
    display: block;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    margin-bottom: var(--space-2);
    transition: color 0.2s ease-in-out;
    font-size: var(--font-size-sm);
}

.footer-section a:hover {
    color: var(--color-white);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-8);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.6);
    font-size: var(--font-size-sm);
}

/* Curriculum Page Styles */
.curriculum-flowchart {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-top: var(--space-12);
}

.curriculum-area {
    background-color: var(--color-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    overflow: hidden;
    transition: all 0.3s ease-in-out;
}

.curriculum-area:hover {
    box-shadow: var(--shadow-md);
}

.area-header {
    padding: var(--space-6);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--space-4);
    transition: all 0.3s ease-in-out;
    background-color: var(--color-surface);
}

.area-header:hover {
    background-color: var(--color-gray-100);
}

.curriculum-area[data-area="numbers"] .area-header {
    border-left: 4px solid var(--color-secondary);
}

.curriculum-area[data-area="geometry"] .area-header {
    border-left: 4px solid var(--color-tertiary);
}

.curriculum-area[data-area="statistics"] .area-header {
    border-left: 4px solid var(--color-quaternary);
}

.curriculum-area[data-area="integrated"] .area-header {
    border-left: 4px solid var(--color-accent);
}

.area-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-size: var(--font-size-xl);
    flex-shrink: 0;
}

.curriculum-area[data-area="numbers"] .area-icon {
    background-color: var(--color-secondary);
}

.curriculum-area[data-area="geometry"] .area-icon {
    background-color: var(--color-tertiary);
}

.curriculum-area[data-area="statistics"] .area-icon {
    background-color: var(--color-quaternary);
}

.curriculum-area[data-area="integrated"] .area-icon {
    background-color: var(--color-accent);
}

.area-info {
    flex: 1;
}

.area-info h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.area-info p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

.toggle-icon {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    transition: transform 0.3s ease-in-out;
}

.area-header.active .toggle-icon {
    transform: rotate(180deg);
}

.area-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-in-out;
    background-color: var(--color-white);
}

.area-content.active {
    max-height: 3000px;
}

.modules-grid {
    padding: var(--space-6);
    display: grid;
    gap: var(--space-4);
}

.module-card {
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    overflow: hidden;
    transition: all 0.3s ease-in-out;
}

.module-card:hover {
    box-shadow: var(--shadow-sm);
    transform: translateY(-2px);
}

.module-header {
    padding: var(--space-4) var(--space-6);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    transition: all 0.3s ease-in-out;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
}

.module-header:hover {
    background-color: var(--color-surface);
}

.module-number {
    width: 32px;
    height: 32px;
    background-color: var(--color-secondary);
    color: var(--color-white);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    flex-shrink: 0;
}

.module-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    flex: 1;
}

.module-toggle {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    transition: transform 0.3s ease-in-out;
}

.module-header.active .module-toggle {
    transform: rotate(90deg);
}

.module-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-in-out;
    background-color: var(--color-white);
}

.module-content.active {
    max-height: 1000px;
}

.module-secondary {
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid var(--color-border-light);
}

.module-secondary:last-child {
    border-bottom: none;
}

.module-secondary h4 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-3);
}

.learning-objectives {
    list-style: none;
    padding: 0;
    margin: 0;
}

.learning-objectives li {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2);
    padding-left: var(--space-4);
    position: relative;
    line-height: var(--line-height-relaxed);
}

.learning-objectives li::before {
    content: '•';
    color: var(--color-quaternary);
    font-weight: var(--font-weight-bold);
    position: absolute;
    left: 0;
    top: 0;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .promo-content {
        flex-direction: column;
        gap: var(--space-3);
    }
    
    .nav-menu {
        position: absolute;
        left: -100%;
        top: 100%;
        flex-direction: column;
        background-color: var(--color-white);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-md);
        padding: var(--space-6) 0;
        z-index: 999;
        border-top: 1px solid var(--color-border);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        margin: var(--space-3) 0;
    }

    .hamburger {
        display: flex;
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }

    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active span:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }

    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    .hero-actions,
    .cta-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-large {
        width: 100%;
        max-width: 280px;
    }
    
    .testimonials-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .area-header {
        padding: var(--space-4);
        flex-direction: column;
        text-align: center;
        gap: var(--space-3);
    }
    
    .area-info h3 {
        font-size: var(--font-size-lg);
    }
    
    .area-info p {
        font-size: var(--font-size-sm);
    }
    
    .module-header {
        padding: var(--space-3) var(--space-4);
    }
    
    .module-title {
        font-size: var(--font-size-sm);
    }
    
    .modules-grid {
        padding: var(--space-4);
    }
    
    .pricing-card.featured {
        transform: none;
    }
}

/* Auto-scrolling containers */
.testimonials-scroll-container {
    overflow: hidden;
    position: relative;
    width: 100%;
    margin: var(--space-8) 0;
}

.testimonials-scroll-container::before,
.testimonials-scroll-container::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    width: 100px;
    z-index: 10;
    pointer-events: none;
}

.testimonials-scroll-container::before {
    left: 0;
    background: linear-gradient(to right, 
        var(--color-surface) 0%, 
        var(--color-surface) 20%, 
        rgba(248, 250, 252, 0.8) 60%, 
        transparent 100%);
}

.testimonials-scroll-container::after {
    right: 0;
    background: linear-gradient(to left, 
        var(--color-surface) 0%, 
        var(--color-surface) 20%, 
        rgba(248, 250, 252, 0.8) 60%, 
        transparent 100%);
}

.testimonials-scroll-container .testimonials-grid {
    display: flex;
    width: max-content;
    animation: seamlessScroll 60s linear infinite;
    gap: var(--space-6);
}

.testimonials-scroll-container:hover .testimonials-grid {
    animation-play-state: paused;
}

.testimonials-scroll-container .testimonial-card {
    flex-shrink: 0;
    width: 400px;
    margin: 0;
}

@keyframes seamlessScroll {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}

/* Responsive adjustments for scrolling */
@media (max-width: 768px) {
    .testimonials-scroll-container {
        width: 100%;
        margin: var(--space-8) 0;
    }
    
    .testimonials-scroll-container::before,
    .testimonials-scroll-container::after {
        width: 60px;
    }
    
    .testimonials-scroll-container .testimonial-card {
        width: 320px;
    }
    
    .testimonials-scroll-container .testimonials-grid {
        animation-duration: 45s;
    }
}

/* Hero promotional content */
.hero-promo {
    margin: var(--space-8) 0 var(--space-12) 0;
    text-align: center;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.promo-big-text {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
    line-height: 1.2;
}

.promo-small-text {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin: 0;
}

@media (max-width: 768px) {
    .promo-big-text {
        font-size: var(--font-size-2xl);
    }
    
    .promo-small-text {
        font-size: var(--font-size-base);
    }
    
    .hero-promo {
        margin: var(--space-6) 0 var(--space-8) 0;
    }
}

/* How It Works Process Section */
.how-it-works {
    margin: var(--space-16) 0;
    padding: var(--space-12) var(--space-8);
    background: linear-gradient(135deg, rgba(95, 99, 102, 0.05), rgba(134, 179, 209, 0.05));
    border-radius: var(--radius-xl);
    border: 1px solid rgba(95, 99, 102, 0.1);
}

.process-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    text-align: center;
    margin-bottom: var(--space-12);
}

.curriculum-title {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    text-align: center;
    margin: var(--space-16) 0 var(--space-4) 0;
    letter-spacing: -0.025em;
}

.curriculum-subtitle {
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    text-align: center;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-12);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.curriculum-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-12);
    text-align: center;
}

.process-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    flex-wrap: wrap;
    max-width: 1200px;
    margin: 0 auto;
}

.process-step {
    flex: 1;
    min-width: 200px;
    max-width: 250px;
    text-align: center;
    padding: var(--space-6);
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    transition: all 0.3s ease;
}

.process-step:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.step-number {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--color-secondary), var(--color-tertiary));
    color: var(--color-white);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin: 0 auto var(--space-4) auto;
}

.step-content h4 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-3);
}

.step-content p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    margin: 0;
}

.process-arrow {
    color: var(--color-secondary);
    font-size: var(--font-size-xl);
    flex-shrink: 0;
    opacity: 0.6;
}

/* Responsive adjustments for process steps */
@media (max-width: 1024px) {
    .process-steps {
        flex-direction: column;
        gap: var(--space-6);
    }
    
    .process-arrow {
        transform: rotate(90deg);
        margin: var(--space-2) 0;
    }
    
    .process-step {
        max-width: 400px;
        width: 100%;
    }
}

@media (max-width: 768px) {
    .how-it-works {
        padding: var(--space-8) var(--space-4);
        margin: var(--space-12) 0;
    }
    
    .process-title {
        font-size: var(--font-size-xl);
        margin-bottom: var(--space-8);
    }
    
    .process-step {
        padding: var(--space-4);
    }
    
    .step-number {
        width: 40px;
        height: 40px;
        font-size: var(--font-size-lg);
    }
}

/* New Testimonials Section Styles */
.testimonials-section {
    background: var(--color-surface);
    padding: var(--space-16) 0;
}

.testimonials-container {
    margin: var(--space-8) 0;
    overflow: hidden;
    position: relative;
    /* Mask edges for smoother visual effect */
    mask-image: linear-gradient(
        to right,
        transparent 0%,
        black 5%,
        black 95%,
        transparent 100%
    );
    -webkit-mask-image: linear-gradient(
        to right,
        transparent 0%,
        black 5%,
        black 95%,
        transparent 100%
    );
}

/* Update testimonial scroll for infinite loop */
.testimonial-scroll {
    display: flex;
    gap: var(--space-6);
    animation: scroll-testimonials 120s linear infinite;
    width: max-content;
    will-change: transform;
    /* Ensure hardware acceleration */
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
}

.testimonial-scroll:hover {
    animation-play-state: paused;
}

/* Smooth transitions for testimonial cards */
.testimonials-section .testimonial-card {
    background: white;
    border-radius: var(--border-radius-lg);
    padding: var(--space-6);
    box-shadow: var(--shadow-md);
    min-width: 350px;
    max-width: 350px;
    flex-shrink: 0;
    /* Ensure cards don't blur during scroll */
    transform: translateZ(0);
}

/* Update the animation for seamless infinite scroll */
@keyframes scroll-testimonials {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}

/* Handle reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    .testimonial-scroll {
        animation: none;
        transform: translateX(0);
    }
    
    .testimonials-container {
        mask-image: none;
        -webkit-mask-image: none;
    }
}

.testimonial-content {
    margin-bottom: var(--space-4);
}

.testimonial-content p {
    font-style: italic;
    color: var(--color-gray-700);
    line-height: 1.6;
    margin: 0;
}

.testimonial-author {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.author-info h4 {
    color: var(--color-primary);
    margin: 0 0 var(--space-1) 0;
    font-size: var(--font-size-lg);
}

.author-info p {
    color: var(--color-gray-600);
    margin: 0;
    font-size: var(--font-size-sm);
}

.testimonial-rating {
    color: var(--color-warning);
    font-size: var(--font-size-sm);
}

.testimonial-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-8);
    margin-top: var(--space-12);
    text-align: center;
}

.testimonial-stats .stat-item {
    background: white;
    padding: var(--space-6);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
}

.testimonial-stats .stat-number {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    margin-bottom: var(--space-2);
}

.testimonial-stats .stat-label {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-gray-800);
    margin-bottom: var(--space-1);
}

.testimonial-stats .stat-description {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

/* Enhanced Navigation Styles */
.nav-brand a {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    text-decoration: none;
    color: var(--color-primary);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
}

.nav-brand i {
    font-size: var(--font-size-2xl);
}

.nav-menu li a {
    position: relative;
}

.nav-menu li a.active {
    color: var(--color-primary);
}

.nav-menu li a.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-primary);
}

.nav-login.active,
.nav-signup.active {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

/* Enhanced Problem Cards Styling for Sample Problems */
.problems-section .problem-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    border: 1px solid var(--color-border);
    height: 100%;
    display: flex;
    flex-direction: column;
    position: relative;
    cursor: pointer;
}

.problems-section .problem-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-secondary);
}

.problem-module {
    margin-bottom: var(--space-3);
}

.module-badge {
    background-color: var(--color-secondary);
    color: var(--color-white);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.problem-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-3);
    line-height: var(--line-height-tight);
}

.knowledge-points {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.knowledge-tag {
    background-color: var(--color-tertiary);
    color: var(--color-white);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
}

.problem-description {
    flex-grow: 1;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-4);
}

.problem-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-border-light);
    font-size: var(--font-size-xs);
}

.difficulty {
    color: var(--color-text-secondary);
}

.difficulty strong {
    color: var(--color-text-primary);
    font-weight: var(--font-weight-semibold);
}

.grade-level {
    color: var(--color-text-tertiary);
    font-weight: var(--font-weight-medium);
}

/* Problem Tabs Styling */
.problem-tabs {
    display: flex;
    justify-content: center;
    margin-bottom: var(--space-8);
    border-bottom: 2px solid var(--color-border);
    overflow-x: auto;
    padding-bottom: 0;
}

.tab-button {
    background: none;
    border: none;
    padding: var(--space-4) var(--space-6);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-normal);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
    white-space: nowrap;
    position: relative;
    font-family: var(--font-family-sans);
}

.tab-button:hover {
    color: var(--color-text-primary);
    background-color: var(--color-gray-50);
}

.tab-button.active {
    color: var(--color-secondary);
    border-bottom-color: var(--color-secondary);
    font-weight: var(--font-weight-medium);
}

.tab-content {
    display: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.tab-content.active {
    display: block;
    opacity: 1;
}

/* Responsive adjustments for problem cards */
@media (max-width: 768px) {
    .problems-section .problems-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
    
    .problems-section .problem-card {
        padding: var(--space-4);
    }
    
    .problem-title {
        font-size: var(--font-size-base);
    }
    
    .problem-footer {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }
    
    .problem-tabs {
        justify-content: flex-start;
        margin-bottom: var(--space-6);
    }
    
    .tab-button {
        padding: var(--space-3) var(--space-4);
        font-size: var(--font-size-xs);
    }
}

/* Learning Journey Section */
.learning-journey {
    margin: 4rem 0 0 0;
}

/* Phase Curriculum Styles */
.phase-curriculum {
    margin-top: 1rem;
    padding: 1rem;
    background: transparent;
    border-radius: 16px;
    border: 1px solid transparent;
}

.phase-curriculum h5 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    text-align: center;
}

.phase-curriculum p {
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.phase-curriculum .curriculum-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.phase-curriculum .stat-item {
    text-align: center;
    padding: 1rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.phase-curriculum .stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.phase-curriculum .stat-label {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.phase-curriculum .stat-description {
    font-size: 1rem;
    color: var(--text-secondary);
}

.phase-curriculum .curriculum-flowchart {
    background: transparent;
    border: 1px solid transparent;
    border-radius: 12px;
    padding: 0.75rem;
}

.phase-curriculum .curriculum-area {
    margin-bottom: 0.5rem;
}

.phase-curriculum .curriculum-area:last-child {
    margin-bottom: 0;
}

.phase-curriculum .area-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, #4338ca 100%);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.phase-curriculum .area-header:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.phase-curriculum .area-icon {
    color: white;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.phase-curriculum .area-info {
    flex: 1;
}

.phase-curriculum .area-info h3 {
    color: #000000;
    font-size: 1.3rem;
    font-weight: 600;
    margin: 0;
}

.phase-curriculum .area-info p {
    color: #000000;
    font-size: 1rem;
    margin: 0.25rem 0 0 0;
    text-align: left;
}

.phase-curriculum .toggle-icon {
    color: white;
}

.phase-curriculum .area-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-in-out;
    background-color: var(--color-white);
    margin-top: -20px;
}

.phase-curriculum .area-content.active {
    max-height: 3000px;
}

.phase-curriculum .modules-grid {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 0.5rem;
    padding: 0.5rem 0;
}

.phase-curriculum .module-card {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    overflow: hidden;
    position: relative;
}

.phase-curriculum .module-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem;
    background: white;
    border-bottom: 1px solid #e2e8f0;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.phase-curriculum .module-header:hover {
    background: #f1f5f9;
}

.phase-curriculum .module-header .module-info {
    flex: 1;
}

.phase-curriculum .module-number {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary-color);
}

.phase-curriculum .module-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.phase-curriculum .module-toggle {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.phase-curriculum .module-content {
    max-height: 0;
    overflow: hidden;
    padding: 0 1.5rem;
    background: #f8fafc;
    border-top: 1px solid #e2e8f0;
    transition: max-height 0.3s ease-out, padding 0.3s ease-out;
}

.phase-curriculum .module-content.active {
    max-height: 1000px;
    padding: 1.5rem;
}

.phase-curriculum .module-secondary {
    margin-bottom: 1.5rem;
}

.phase-curriculum .module-secondary:last-child {
    margin-bottom: 0;
}

.phase-curriculum .module-secondary h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #000000;
    margin: 0 0 0.75rem 0;
}

.phase-curriculum .learning-objectives {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.phase-curriculum .learning-objectives li {
    font-size: 1rem;
    color: #000000;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.5;
}

.phase-curriculum .learning-objectives li::before {
    content: "•";
    color: var(--primary-color);
    font-weight: bold;
    position: absolute;
    left: 0;
    top: 0;
}

.journey-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
    text-align: center;
    margin-bottom: 1rem;
}

.journey-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    text-align: center;
    margin-bottom: 3rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* Learning Flow */
.learning-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 4rem;
    padding: 2rem;
    background: linear-gradient(135deg, #f8fafc, #e2e8f0);
    border-radius: 16px;
}

.flow-step {
    display: flex;
    align-items: center;
    gap: 1rem;
    text-align: left;
}

.flow-number {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--color-secondary), var(--color-tertiary));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: bold;
    flex-shrink: 0;
}

.flow-content h4 {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0 0 0.5rem 0;
}

.flow-content p {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    margin: 0;
    max-width: 250px;
}

.flow-arrow {
    font-size: 1.5rem;
    color: var(--color-secondary);
}

/* Learning Phases */
.learning-phase {
    background: transparent;
    border-radius: 16px;
    border: 1px solid transparent;
    padding: 2.5rem;
    margin-bottom: 0;
}

/* Phase 1 Specific Styling */
.phase-1 {
    background: linear-gradient(135deg, rgba(77, 109, 154, 0.05), rgba(134, 179, 209, 0.08));
    border: 1px solid rgba(77, 109, 154, 0.1);
}

.phase-1 .phase-icon {
    background: linear-gradient(135deg, var(--color-secondary), var(--color-tertiary));
}

/* Phase 2 Specific Styling */
.phase-2 {
    background: linear-gradient(135deg, rgba(153, 206, 211, 0.05), rgba(237, 181, 191, 0.08));
    border: 1px solid rgba(153, 206, 211, 0.1);
}

.phase-2 .phase-icon {
    background: linear-gradient(135deg, var(--color-quaternary), var(--color-accent));
}

.phase-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 0.25rem;
}

.phase-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.phase-icon i {
    font-size: 2rem;
    color: white;
}

.phase-info h4 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin: 0 0 0.5rem 0;
}

.phase-info p {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    margin: 0;
}

/* Phase Method */
.phase-method {
    margin-bottom: 2rem;
}

.phase-method h5 {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 1.5rem;
    text-align: center;
}

.method-steps {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.method-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    max-width: 150px;
}

.step-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.method-step span {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 0.25rem;
}

.method-step small {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.step-arrow {
    font-size: 1.5rem;
    color: var(--color-secondary);
    font-weight: bold;
    margin-top: 1rem;
}

/* Curriculum Overview */
.curriculum-overview h5 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 1.5rem;
    text-align: center;
}

.core-modules {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.core-module {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--color-light-bg);
    border-radius: 12px;
    border: 1px solid var(--color-border);
}

.core-module i {
    color: var(--color-secondary);
    font-size: 1.2rem;
}

.core-module span {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text-primary);
}

/* Specialized Curriculum */
.specialized-curriculum {
    margin-top: 2rem;
}

.specialized-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.specialized-area {
    background: var(--color-light-bg);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--color-border);
}

.area-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.area-header i {
    color: var(--color-secondary);
    font-size: 1.2rem;
}

.area-header h6 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0;
}

.area-topics {
    list-style: none;
    padding: 0;
    margin: 0;
}

.area-topics li {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    padding: 0.4rem 0;
    position: relative;
    padding-left: 1.2rem;
    line-height: 1.4;
}

.area-topics li::before {
    content: "•";
    color: var(--color-secondary);
    font-weight: bold;
    position: absolute;
    left: 0;
}

/* Learning Outcomes */
.learning-outcomes {
    margin-top: 3rem;
    padding: 2rem;
    background: linear-gradient(135deg, #f0f9ff, #e0f2fe);
    border-radius: 16px;
    border: 1px solid var(--color-border);
}

.learning-outcomes h5 {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 1.5rem;
    text-align: center;
}

.outcomes-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.outcome-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--color-white);
    border-radius: 12px;
    border: 1px solid var(--color-border);
}

.outcome-item i {
    color: var(--color-success);
    font-size: 1.2rem;
    flex-shrink: 0;
}

.outcome-item span {
    font-size: 0.95rem;
    color: var(--color-text-primary);
    font-weight: 500;
}

/* Responsive Design */
@media (max-width: 768px) {
    .journey-title {
        font-size: 2rem;
    }
    
    .journey-subtitle {
        font-size: 1.1rem;
    }
    
    .learning-flow {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .flow-step {
        text-align: center;
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .flow-content {
        text-align: center;
    }
    
    .flow-content p {
        max-width: none;
    }
    
    .flow-arrow {
        transform: rotate(90deg);
    }
    
    .learning-phase {
        padding: 1.5rem;
    }
    
    .phase-header {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    
    .phase-icon {
        width: 60px;
        height: 60px;
    }
    
    .phase-icon i {
        font-size: 1.5rem;
    }
    
    .phase-info h4 {
        font-size: 1.5rem;
    }
    
    .method-steps {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .step-arrow {
        transform: rotate(90deg);
        margin-top: 0;
    }
    
    .core-modules {
        grid-template-columns: 1fr;
    }
    
    .specialized-grid {
        grid-template-columns: 1fr;
    }
    
    .outcomes-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .journey-title {
        font-size: 1.75rem;
    }
    
    .learning-phase {
        padding: 1rem;
    }
    
    .phase-info h4 {
        font-size: 1.3rem;
    }
    
    .phase-method h5 {
        font-size: 1.2rem;
    }
    
    .specialized-area {
        padding: 1rem;
    }
    
    .area-header h6 {
        font-size: 1rem;
    }
}

/* Phase 2 Curriculum Area Color Coordination */
.phase-2 .curriculum-area[data-area="calculations"] .area-icon {
    background: linear-gradient(135deg, var(--color-quaternary), var(--color-accent));
    color: white;
}

.phase-2 .curriculum-area[data-area="strategies"] .area-icon {
    background: linear-gradient(135deg, var(--color-accent), var(--color-quaternary));
    color: white;
}

.phase-2 .curriculum-area[data-area="word-problems"] .area-icon {
    background: linear-gradient(135deg, var(--color-quaternary), var(--color-accent));
    color: white;
}

.phase-2 .curriculum-area[data-area="olympiad"] .area-icon {
    background: linear-gradient(135deg, var(--color-accent), var(--color-quaternary));
    color: white;
}

/* Update Phase 2 curriculum area headers for better visual consistency */
.phase-2 .curriculum-area .area-header {
    border-left: 4px solid var(--color-quaternary);
    padding-left: 1rem;
    transition: all 0.3s ease;
}

.phase-2 .curriculum-area .area-header:hover {
    border-left-color: var(--color-accent);
    background: linear-gradient(135deg, rgba(153, 206, 211, 0.08), rgba(237, 181, 191, 0.12));
}

/* Phase 1 Curriculum Area Color Coordination */
.phase-1 .curriculum-area[data-area="numbers"] .area-icon {
    background: linear-gradient(135deg, var(--color-secondary), var(--color-tertiary));
    color: white;
}

.phase-1 .curriculum-area[data-area="geometry"] .area-icon {
    background: linear-gradient(135deg, var(--color-tertiary), var(--color-secondary));
    color: white;
}

.phase-1 .curriculum-area[data-area="statistics"] .area-icon {
    background: linear-gradient(135deg, var(--color-secondary), var(--color-tertiary));
    color: white;
}

.phase-1 .curriculum-area[data-area="integrated"] .area-icon {
    background: linear-gradient(135deg, var(--color-tertiary), var(--color-secondary));
    color: white;
}

/* Update Phase 1 curriculum area headers for better visual consistency */
.phase-1 .curriculum-area .area-header {
    border-left: 4px solid var(--color-secondary);
    padding-left: 1rem;
    transition: all 0.3s ease;
}

.phase-1 .curriculum-area .area-header:hover {
    border-left-color: var(--color-tertiary);
    background: linear-gradient(135deg, rgba(77, 109, 154, 0.08), rgba(134, 179, 209, 0.12));
}

/* Phase 1 Sub-Module Container Styling */
.phase-1 .module-card {
    border-left: 3px solid transparent;
    transition: all 0.3s ease;
}

.phase-1 .module-card:hover {
    border-left-color: var(--color-secondary);
    background: linear-gradient(135deg, rgba(77, 109, 154, 0.03), rgba(134, 179, 209, 0.05));
    transform: translateX(4px);
}

.phase-1 .module-number {
    background: linear-gradient(135deg, var(--color-secondary), var(--color-tertiary));
    color: white;
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    font-weight: 600;
    min-width: 3rem;
    text-align: center;
}

/* Phase 2 Sub-Module Container Styling */
.phase-2 .module-card {
    border-left: 3px solid transparent;
    transition: all 0.3s ease;
}

.phase-2 .module-card:hover {
    border-left-color: var(--color-quaternary);
    background: linear-gradient(135deg, rgba(153, 206, 211, 0.03), rgba(237, 181, 191, 0.05));
    transform: translateX(4px);
}

.phase-2 .module-number {
    background: linear-gradient(135deg, var(--color-quaternary), var(--color-accent));
    color: white;
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    font-weight: 600;
    min-width: 3rem;
    text-align: center;
}

/* Enhanced Module Toggle Buttons */
.phase-1 .module-toggle i {
    color: var(--color-secondary);
    transition: color 0.3s ease;
}

.phase-1 .module-card:hover .module-toggle i {
    color: var(--color-tertiary);
}

.phase-2 .module-toggle i {
    color: var(--color-quaternary);
    transition: color 0.3s ease;
}

.phase-2 .module-card:hover .module-toggle i {
    color: var(--color-accent);
}