/* Enhanced CSS Custom Properties - Apple Design System Inspired */
:root {
    /* Apple-accurate color palette */
    --primary-color: #007AFF;
    --secondary-color: #5856D6;
    --accent-color: #FF9500;
    --success-color: #34C759;
    --warning-color: #FF9F0A;
    --error-color: #FF3B30;

    /* Enhanced text hierarchy */
    --text-primary: #1D1D1F;
    --text-secondary: #86868B;
    --text-tertiary: #C7C7CC;
    --text-quaternary: #F2F2F7;

    /* Refined background system */
    --background-primary: #FFFFFF;
    --background-secondary: #F2F2F7;
    --background-tertiary: #FAFAFA;
    --background-elevated: #FFFFFF;
    --background-overlay: rgba(0, 0, 0, 0.4);

    /* Enhanced border system */
    --border-color: #D1D1D6;
    --border-color-secondary: #E5E5E7;
    --border-color-tertiary: #F2F2F7;

    /* Apple-accurate shadows */
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    --shadow-medium: 0 4px 6px rgba(0, 0, 0, 0.07), 0 10px 20px rgba(0, 0, 0, 0.10);
    --shadow-heavy: 0 15px 35px rgba(0, 0, 0, 0.1), 0 5px 15px rgba(0, 0, 0, 0.07);
    --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-floating: 0 8px 30px rgba(0, 0, 0, 0.12);

    /* Apple-accurate border radius */
    --border-radius: 12px;
    --border-radius-large: 20px;
    --border-radius-small: 8px;
    --border-radius-button: 10px;

    /* Enhanced transitions */
    --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-fast: all 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-slow: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --language-transition: all 0.3s ease-out;
    --theme-transition: all 0.25s ease-out;

    /* Enhanced typography */
    --font-family-en: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Inter', 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-family-zh: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', 'Helvetica Neue', Arial, sans-serif;
    --font-family: var(--font-family-en);

    /* Enhanced effects */
    --backdrop-blur: blur(20px);
    --backdrop-blur-light: blur(10px);

    /* Spacing system */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
}

/* Enhanced Dark Theme Variables */
[data-theme="dark"] {
    --primary-color: #0A84FF;
    --secondary-color: #5E5CE6;
    --accent-color: #FF9F0A;
    --success-color: #30D158;
    --warning-color: #FF9F0A;
    --error-color: #FF453A;
    --text-primary: #FFFFFF;
    --text-secondary: #EBEBF5CC;
    --text-tertiary: #EBEBF599;
    --background-primary: #000000;
    --background-secondary: #1C1C1E;
    --background-tertiary: #2C2C2E;
    --background-elevated: #1C1C1E;
    --border-color: #38383A;
    --border-color-secondary: #48484A;
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.6);
    --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.7);
    --shadow-heavy: 0 8px 32px rgba(0, 0, 0, 0.8);
    --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.5);
}

/* Auto Theme - follows system preference */
@media (prefers-color-scheme: dark) {
    [data-theme="auto"] {
        --primary-color: #0A84FF;
        --secondary-color: #5E5CE6;
        --accent-color: #FF9F0A;
        --success-color: #30D158;
        --warning-color: #FF9F0A;
        --error-color: #FF453A;
        --text-primary: #FFFFFF;
        --text-secondary: #EBEBF5;
        --text-tertiary: #EBEBF599;
        --background-primary: #000000;
        --background-secondary: #1C1C1E;
        --background-tertiary: #2C2C2E;
        --background-elevated: #1C1C1E;
        --border-color: #38383A;
        --border-color-secondary: #48484A;
        --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.5);
        --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.6);
        --shadow-heavy: 0 8px 32px rgba(0, 0, 0, 0.7);
        --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.4);
    }
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--background-primary);
    overflow-x: hidden;
    transition: var(--theme-transition);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* Language-specific typography */
[lang="zh"], [lang="zh-CN"], .lang-zh {
    font-family: var(--font-family-zh);
    font-weight: 400;
    letter-spacing: 0.02em;
}

[lang="en"], [lang="en-US"], .lang-en {
    font-family: var(--font-family-en);
    font-weight: 400;
    letter-spacing: -0.01em;
}

/* Enhanced Chinese typography */
.lang-zh h1, .lang-zh h2, .lang-zh h3, .lang-zh h4, .lang-zh h5, .lang-zh h6 {
    font-weight: 500;
    letter-spacing: 0.01em;
}

.lang-zh p, .lang-zh span, .lang-zh div {
    font-weight: 400;
    letter-spacing: 0.02em;
    line-height: 1.7;
}

/* Enhanced English typography */
.lang-en h1, .lang-en h2, .lang-en h3, .lang-en h4, .lang-en h5, .lang-en h6 {
    font-weight: 600;
    letter-spacing: -0.02em;
}

.lang-en p, .lang-en span, .lang-en div {
    font-weight: 400;
    letter-spacing: -0.01em;
    line-height: 1.6;
}

/* Language transition effects */
.language-transitioning {
    opacity: 0.8;
    transition: var(--language-transition);
}

.language-transitioning * {
    transition: var(--language-transition);
}

/* Prevent language flash on load - Critical CSS */
html:not(.js-loaded) [data-i18n] {
    opacity: 0;
    visibility: hidden;
}

html.js-loaded [data-i18n] {
    opacity: 1;
    visibility: visible;
    transition: opacity 0.2s ease-out;
}

/* Ensure proper font loading */
html.lang-zh {
    font-family: var(--font-family-zh);
}

html.lang-en {
    font-family: var(--font-family-en);
}

/* Prevent layout shift during language loading */
body:not(.language-initialized) {
    opacity: 0.95;
}

body.language-initialized {
    opacity: 1;
    transition: opacity 0.3s ease-out;
}

/* Smooth language transitions */
.language-transitioning [data-i18n] {
    opacity: 0.7;
    transition: opacity 0.15s ease-out;
}

/* Ensure content is visible after JS loads */
.no-js [data-i18n] {
    visibility: visible !important;
    opacity: 1 !important;
}

/* Mobile-first responsive container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px;
}

@media (min-width: 768px) {
    .container {
        padding: 0 24px;
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 32px;
    }
}

/* Enhanced Typography System - Apple Design Hierarchy */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.1;
    margin-bottom: 0.5em;
    color: var(--text-primary);
    text-rendering: optimizeLegibility;
}

/* Large Title - Hero sections */
h1 {
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 700;
    letter-spacing: -0.025em;
    line-height: 1.05;
    margin-bottom: 0.75rem;
}

/* Title 1 - Section headers */
h2 {
    font-size: clamp(2rem, 6vw, 2.75rem);
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.1;
    margin-bottom: 0.625rem;
}

/* Title 2 - Subsection headers */
h3 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 600;
    letter-spacing: -0.015em;
    line-height: 1.15;
    margin-bottom: 0.5rem;
}

/* Title 3 - Card titles */
h4 {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    font-weight: 600;
    letter-spacing: -0.01em;
    line-height: 1.2;
    margin-bottom: 0.5rem;
}

/* Headline - Important text */
.headline {
    font-size: clamp(1.125rem, 2.5vw, 1.25rem);
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.3;
    margin-bottom: 0.5rem;
}

/* Body - Regular text */
p {
    margin-bottom: 1.25em;
    color: var(--text-secondary);
    font-size: clamp(1rem, 2.5vw, 1.125rem);
    line-height: 1.6;
    font-weight: 400;
}

/* Callout - Emphasized body text */
.lead {
    font-size: clamp(1.125rem, 3vw, 1.375rem);
    font-weight: 400;
    color: var(--text-primary);
    line-height: 1.5;
    margin-bottom: 1.5rem;
}

/* Subheadline - Supporting text */
.subheadline {
    font-size: clamp(0.9rem, 2vw, 1rem);
    font-weight: 500;
    color: var(--text-secondary);
    line-height: 1.4;
    margin-bottom: 0.75rem;
}

/* Footnote - Small text */
.footnote {
    font-size: clamp(0.8rem, 1.8vw, 0.875rem);
    font-weight: 400;
    color: var(--text-tertiary);
    line-height: 1.3;
}

/* Caption - Very small text */
.caption {
    font-size: clamp(0.75rem, 1.5vw, 0.8rem);
    font-weight: 400;
    color: var(--text-tertiary);
    line-height: 1.2;
}

/* Enhanced Button System - Apple Design Language */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px 32px;
    border-radius: var(--border-radius-button);
    text-decoration: none;
    font-weight: 600;
    font-size: clamp(1rem, 2.5vw, 1.125rem);
    transition: var(--transition-fast);
    border: none;
    cursor: pointer;
    text-align: center;
    min-height: 48px; /* Enhanced touch target */
    min-width: 48px;
    position: relative;
    overflow: hidden;
    -webkit-tap-highlight-color: transparent;
    white-space: nowrap;
    user-select: none;
}

/* Primary Button - Filled style */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    box-shadow: var(--shadow-card);
    border: 1px solid transparent;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-floating);
    background: linear-gradient(135deg, #0056CC 0%, #4A4AE6 100%);
}

.btn-primary:active {
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
    transition: var(--transition-fast);
}

/* Secondary Button - Tinted style */
.btn-secondary {
    background: var(--background-elevated);
    color: var(--primary-color);
    border: 1.5px solid var(--border-color);
    box-shadow: var(--shadow-card);
}

.btn-secondary:hover {
    background: var(--background-tertiary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    border-color: var(--primary-color);
}

.btn-secondary:active {
    transform: translateY(-1px);
    background: var(--background-secondary);
    transition: var(--transition-fast);
}

/* Tertiary Button - Plain style */
.btn-tertiary {
    background: transparent;
    color: var(--primary-color);
    border: none;
    box-shadow: none;
    padding: 12px 24px;
}

.btn-tertiary:hover {
    background: var(--background-secondary);
    transform: translateY(-1px);
}

.btn-tertiary:active {
    background: var(--background-tertiary);
    transform: translateY(0);
}

/* Button sizes */
.btn-large {
    padding: 20px 40px;
    font-size: clamp(1.125rem, 3vw, 1.25rem);
    min-height: 56px;
}

.btn-small {
    padding: 12px 24px;
    font-size: clamp(0.875rem, 2vw, 0.95rem);
    min-height: 40px;
}

.btn-full {
    width: 100%;
}

/* Button with icon */
.btn-icon {
    gap: 8px;
}

.btn-icon-only {
    padding: 16px;
    min-width: 48px;
    aspect-ratio: 1;
}

/* Mobile button adjustments */
@media (max-width: 768px) {
    .btn {
        padding: 16px 24px;
        font-size: 1rem;
        min-height: 48px; /* Larger touch targets on mobile */
    }
}

/* Enhanced Navigation for Mobile and Dark Theme */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--background-primary);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--theme-transition);
    box-shadow: var(--shadow-light);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

@media (min-width: 768px) {
    .nav-container {
        padding: 0 24px;
        height: 70px;
    }
}

.nav-logo h2 {
    color: var(--primary-color);
    margin: 0;
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    font-weight: 700;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 1rem;
    align-items: center;
    margin: 0;
    padding: 0;
}

@media (min-width: 768px) {
    .nav-menu {
        gap: 1.5rem;
    }
}

.nav-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: var(--transition-fast);
    padding: 12px 16px;
    border-radius: var(--border-radius-small);
    font-size: clamp(0.875rem, 2.5vw, 0.95rem);
    min-height: 44px;
    display: flex;
    align-items: center;
    -webkit-tap-highlight-color: transparent;
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition-fast);
    transform: translateX(-50%);
}

.nav-link:hover {
    color: var(--primary-color);
    background: var(--background-secondary);
    transform: translateY(-1px);
}

.nav-link:hover::before {
    width: 80%;
}

.nav-link.active {
    color: var(--primary-color);
    background: var(--background-tertiary);
}

.nav-link.active::before {
    width: 80%;
}

.contact-btn {
    background: var(--primary-color) !important;
    color: white !important;
    box-shadow: var(--shadow-card);
}

.contact-btn:hover {
    background: var(--secondary-color) !important;
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}

/* Enhanced Navigation Controls for Mobile */
.nav-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.control-btn {
    background: var(--background-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    padding: 10px 12px;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-family);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
    box-shadow: var(--shadow-card);
    -webkit-tap-highlight-color: transparent;
}

.control-btn:hover {
    background: var(--background-tertiary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}

.control-btn:active {
    transform: translateY(0);
    background: var(--background-secondary);
}

.theme-toggle .theme-icon {
    font-size: 1.25rem;
    transition: var(--transition);
    line-height: 1;
}

.language-toggle .lang-text {
    font-weight: 700;
    font-size: 0.8rem;
    letter-spacing: 0.02em;
}

/* Mobile adjustments for controls */
@media (max-width: 768px) {
    .nav-controls {
        gap: 0.375rem;
    }

    .control-btn {
        min-width: 40px;
        min-height: 40px;
        padding: 8px 10px;
    }

    .theme-toggle .theme-icon {
        font-size: 1.1rem;
    }

    .language-toggle .lang-text {
        font-size: 0.75rem;
    }
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: var(--transition);
    border-radius: 2px;
}

/* Enhanced Hero Section for Mobile and Dark Theme */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--background-primary);
    padding-top: 64px;
    position: relative;
    overflow: hidden;
}

@media (min-width: 768px) {
    .hero {
        padding-top: 70px;
        background: linear-gradient(135deg, var(--background-primary) 0%, var(--background-secondary) 100%);
    }
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 16px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    align-items: center;
}

@media (min-width: 768px) {
    .hero-container {
        padding: 0 24px;
        grid-template-columns: 1fr 1fr;
        gap: 3rem;
    }
}

@media (min-width: 1024px) {
    .hero-container {
        gap: 4rem;
    }
}

.hero-content {
    animation: fadeInUp 1s ease-out;
    text-align: center;
}

@media (min-width: 768px) {
    .hero-content {
        text-align: left;
    }
}

.hero-title {
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 3vw, 1.5rem);
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-style: italic;
    font-weight: 400;
}

.hero-description {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    margin-bottom: 2rem;
    max-width: 100%;
    line-height: 1.6;
}

@media (min-width: 768px) {
    .hero-description {
        max-width: 500px;
    }
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-direction: column;
    align-items: center;
}

@media (min-width: 480px) {
    .hero-buttons {
        flex-direction: row;
        justify-content: center;
    }
}

@media (min-width: 768px) {
    .hero-buttons {
        justify-content: flex-start;
    }
}

.hero-visual {
    position: relative;
    height: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 1rem;
}

@media (min-width: 768px) {
    .hero-visual {
        height: 400px;
        margin-top: 0;
    }
}

.floating-card {
    position: absolute;
    background: var(--background-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-large);
    padding: 1.25rem;
    box-shadow: var(--shadow-card);
    animation: float 6s ease-in-out infinite;
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    max-width: 140px;
    text-align: center;
}

@media (min-width: 768px) {
    .floating-card {
        padding: 1.5rem;
        max-width: 160px;
    }
}

.floating-card:nth-child(1) {
    top: 15%;
    left: 5%;
    animation-delay: 0s;
}

.floating-card:nth-child(2) {
    top: 45%;
    right: 5%;
    animation-delay: 2s;
}

.floating-card:nth-child(3) {
    bottom: 15%;
    left: 15%;
    animation-delay: 4s;
}

@media (min-width: 768px) {
    .floating-card:nth-child(1) {
        top: 20%;
        left: 10%;
    }

    .floating-card:nth-child(2) {
        top: 50%;
        right: 10%;
    }

    .floating-card:nth-child(3) {
        bottom: 20%;
        left: 20%;
    }
}

.card-content h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: clamp(0.9rem, 2.5vw, 1.1rem);
    font-weight: 600;
}

.card-content p {
    color: var(--text-secondary);
    margin: 0;
    font-size: clamp(0.8rem, 2vw, 0.9rem);
    line-height: 1.4;
}

/* Enhanced Section Styles for Mobile */
section {
    padding: 3rem 0;
}

@media (min-width: 768px) {
    section {
        padding: 4rem 0;
    }
}

@media (min-width: 1024px) {
    section {
        padding: 5rem 0;
    }
}

.section-header {
    text-align: center;
    margin-bottom: 2.5rem;
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
    padding: 0 1rem;
}

@media (min-width: 768px) {
    .section-header {
        margin-bottom: 3.5rem;
        max-width: 600px;
        padding: 0;
    }
}

@media (min-width: 1024px) {
    .section-header {
        margin-bottom: 4rem;
    }
}

.section-header h2 {
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.section-header p {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    line-height: 1.5;
}

/* Enhanced About Section */
.about {
    background: var(--background-secondary);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

@media (min-width: 768px) {
    .about-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 2rem;
    }
}

@media (min-width: 1024px) {
    .about-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.about-card {
    background: var(--background-elevated);
    border: 1px solid var(--border-color);
    padding: var(--spacing-xl) var(--spacing-lg);
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-card);
    text-align: center;
    transition: var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.about-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: var(--transition-fast);
    transform-origin: left;
}

.about-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-floating);
    border-color: var(--border-color-secondary);
}

.about-card:hover::before {
    transform: scaleX(1);
}

.card-icon {
    font-size: clamp(2.5rem, 6vw, 3rem);
    margin-bottom: 1rem;
    line-height: 1;
}

.about-card h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: clamp(1.125rem, 3vw, 1.25rem);
}

.about-card p {
    font-size: clamp(0.875rem, 2.5vw, 0.95rem);
    line-height: 1.6;
}

/* Small Groups Section */
.small-groups {
    background: var(--background-primary);
}

.content-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.benefits-list {
    list-style: none;
    margin-top: 2rem;
}

.benefits-list li {
    display: flex;
    align-items: flex-start;
    margin-bottom: 1.5rem;
    gap: 1rem;
}

.benefit-icon {
    background: var(--primary-color);
    color: white;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: bold;
    flex-shrink: 0;
    margin-top: 0.2rem;
}

.benefits-list strong {
    color: var(--text-primary);
    display: block;
    margin-bottom: 0.25rem;
}

.benefits-list p {
    margin: 0;
    font-size: 0.95rem;
}

.group-illustration {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    position: relative;
}

.student-avatar, .teacher-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--background-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    box-shadow: var(--shadow-light);
    animation: bounce 2s ease-in-out infinite;
}

.teacher-avatar {
    background: var(--primary-color);
    color: white;
    animation-delay: 1s;
}

.student-avatar:nth-child(2) { animation-delay: 0.5s; }
.student-avatar:nth-child(3) { animation-delay: 1.5s; }
.student-avatar:nth-child(4) { animation-delay: 2s; }

/* Method Section */
.method {
    background: var(--background-secondary);
}

.method-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.step {
    background: var(--background-elevated);
    padding: 2rem;
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-light);
    text-align: center;
    position: relative;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.step:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.step-number {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
}

.step h3 {
    color: var(--text-primary);
    margin: 1rem 0;
}

/* Subjects Section */
.subjects {
    background: var(--background-primary);
}

.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.subject-card {
    background: var(--background-tertiary);
    padding: 2rem;
    border-radius: var(--border-radius-large);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.subject-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
    background: var(--background-elevated);
}

.subject-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.subject-card h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

/* Testimonials Section */
.testimonials {
    background: var(--background-secondary);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.testimonial-card {
    background: var(--background-elevated);
    padding: 2rem;
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.testimonial-content {
    margin-bottom: 1.5rem;
}

.testimonial-content p {
    font-style: italic;
    color: var(--text-primary);
    font-size: 1.1rem;
    line-height: 1.6;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.author-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--background-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

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

.author-info p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Contact Section */
.contact {
    background: var(--background-primary);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.contact-info h2 {
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.contact-details {
    margin-top: 2rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.contact-icon {
    font-size: 1.5rem;
    margin-top: 0.25rem;
}

.contact-item h4 {
    color: var(--text-primary);
    margin: 0 0 0.25rem 0;
    font-size: 1rem;
}

.contact-item p {
    margin: 0;
    color: var(--text-secondary);
}

/* Enhanced Form Styles for Mobile and Dark Theme */
.contact-form {
    background: var(--background-elevated);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-card);
}

@media (min-width: 768px) {
    .contact-form {
        padding: 2rem;
    }
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 500;
    font-size: clamp(0.875rem, 2.5vw, 0.95rem);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 16px 20px;
    border: 1.5px solid var(--border-color);
    border-radius: var(--border-radius);
    font-family: var(--font-family);
    font-size: clamp(1rem, 2.5vw, 1.125rem);
    transition: var(--transition-fast);
    background: var(--background-elevated);
    color: var(--text-primary);
    min-height: 52px; /* Enhanced touch targets */
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    position: relative;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.1);
    background: var(--background-elevated);
    transform: translateY(-1px);
}

.form-group input:hover,
.form-group select:hover,
.form-group textarea:hover {
    border-color: var(--border-color-secondary);
}

/* Enhanced form validation states */
.form-group.error input,
.form-group.error select,
.form-group.error textarea {
    border-color: var(--error-color);
    box-shadow: 0 0 0 4px rgba(255, 59, 48, 0.1);
}

.form-group.success input,
.form-group.success select,
.form-group.success textarea {
    border-color: var(--success-color);
    box-shadow: 0 0 0 4px rgba(52, 199, 89, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
    line-height: 1.5;
}

.form-group select {
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath fill='none' stroke='%23666' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 16px;
    padding-right: 40px;
}

[data-theme="dark"] .form-group select,
[data-theme="auto"] .form-group select {
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath fill='none' stroke='%23EBEBF5' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3E%3C/svg%3E");
}

/* Enhanced form styling for dark theme */
[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group select,
[data-theme="dark"] .form-group textarea,
[data-theme="auto"] .form-group input,
[data-theme="auto"] .form-group select,
[data-theme="auto"] .form-group textarea {
    background: var(--background-elevated);
    border-color: var(--border-color);
    color: var(--text-primary);
}

[data-theme="dark"] .form-group label,
[data-theme="auto"] .form-group label {
    color: var(--text-primary);
}

/* Footer */
.footer {
    background: var(--background-secondary);
    color: var(--text-primary);
    padding: 3rem 0 1rem;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}

/* Enhanced Animation System */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

@keyframes gentleBounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-8px);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

@keyframes shimmer {
    0% {
        background-position: -200px 0;
    }
    100% {
        background-position: calc(200px + 100%) 0;
    }
}

/* Micro-interaction classes */
.hover-lift {
    transition: var(--transition-fast);
}

.hover-lift:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-floating);
}

.hover-scale {
    transition: var(--transition-fast);
}

.hover-scale:hover {
    transform: scale(1.02);
}

.hover-glow {
    transition: var(--transition-fast);
}

.hover-glow:hover {
    box-shadow: 0 0 20px rgba(0, 122, 255, 0.3);
}

.loading-shimmer {
    background: linear-gradient(90deg,
        var(--background-secondary) 0%,
        var(--background-tertiary) 50%,
        var(--background-secondary) 100%);
    background-size: 200px 100%;
    animation: shimmer 1.5s infinite;
}

/* Enhanced Mobile Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 64px;
        flex-direction: column;
        background: var(--background-elevated);
        backdrop-filter: var(--backdrop-blur);
        -webkit-backdrop-filter: var(--backdrop-blur);
        width: 100%;
        text-align: center;
        transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
        box-shadow: var(--shadow-heavy);
        padding: 1.5rem 0;
        gap: 0.5rem;
        border: 1px solid var(--border-color);
        border-top: none;
        max-height: calc(100vh - 64px);
        overflow-y: auto;
    }

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

    .nav-item {
        width: 100%;
        padding: 0 1rem;
    }

    .nav-link {
        width: 100%;
        padding: 12px 16px;
        border-radius: var(--border-radius);
        margin: 0.25rem 0;
        justify-content: center;
    }

    .nav-controls {
        order: -1;
        margin-bottom: 1rem;
        padding-bottom: 1rem;
        border-bottom: 1px solid var(--border-color);
        justify-content: center;
    }

    .hamburger {
        display: flex;
        z-index: 1001;
    }

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

    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    /* Mobile hero adjustments */
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
        padding: 1.5rem 16px;
    }

    .hero-visual {
        height: 280px;
        order: -1; /* Show visual first on mobile */
    }

    /* Mobile content layout */
    .content-split {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    /* Mobile floating cards - stack them */
    .floating-card {
        position: relative !important;
        margin: 0.75rem auto;
        display: block;
        max-width: 200px;
        animation: none; /* Disable floating animation on mobile */
    }

    .floating-card:nth-child(1),
    .floating-card:nth-child(2),
    .floating-card:nth-child(3) {
        position: relative !important;
        top: auto !important;
        left: auto !important;
        right: auto !important;
        bottom: auto !important;
    }

    /* Mobile group illustration */
    .group-illustration {
        justify-content: center;
        gap: 0.75rem;
    }

    .student-avatar,
    .teacher-avatar {
        width: 56px;
        height: 56px;
        font-size: 1.4rem;
    }

    /* Mobile testimonials */
    .testimonials-grid {
        gap: 1.5rem;
    }

    .testimonial-card {
        padding: 1.5rem;
    }

    /* Mobile subjects grid */
    .subjects-grid {
        gap: 1.5rem;
    }

    .subject-card {
        padding: 1.5rem;
    }
}

/* Extra small mobile devices */
@media (max-width: 480px) {
    .container {
        padding: 0 12px;
    }

    section {
        padding: 2.5rem 0;
    }

    /* Navigation adjustments for small screens */
    .nav-container {
        height: 60px;
        padding: 0 12px;
    }

    .nav-logo h2 {
        font-size: 1.125rem;
    }

    .control-btn {
        min-width: 36px;
        min-height: 36px;
        padding: 6px 8px;
    }

    /* Hero section for small screens */
    .hero {
        padding-top: 60px;
    }

    .hero-container {
        padding: 1rem 12px;
        gap: 1.5rem;
    }

    .hero-visual {
        height: 240px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: 0.75rem;
    }

    .btn {
        width: 100%;
        max-width: 280px;
        padding: 14px 20px;
    }

    /* Grid layouts for small screens */
    .about-grid,
    .subjects-grid,
    .testimonials-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    .method-steps {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    /* Card adjustments */
    .about-card,
    .subject-card,
    .testimonial-card {
        padding: 1.25rem;
    }

    .step {
        padding: 1.25rem;
    }

    /* Modal adjustments for small screens */
    .modal-overlay {
        padding: 0.5rem;
    }

    .modal-content {
        padding: 1.25rem;
    }

    .philosophy-item {
        padding: 1rem;
        gap: 0.75rem;
        flex-direction: column;
        text-align: center;
    }

    .philosophy-number {
        align-self: center;
        width: 32px;
        height: 32px;
        font-size: 1rem;
    }

    /* Form adjustments */
    .contact-form {
        padding: 1.25rem;
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
        padding: 12px 14px;
        font-size: 0.875rem;
    }

    /* Typography adjustments */
    .section-header {
        margin-bottom: 2rem;
    }

    .floating-card {
        max-width: 160px;
        padding: 1rem;
    }
}

/* Very small screens */
@media (max-width: 360px) {
    .hero-visual {
        height: 200px;
    }

    .floating-card {
        max-width: 140px;
        padding: 0.875rem;
    }

    .card-content h3 {
        font-size: 0.875rem;
    }

    .card-content p {
        font-size: 0.75rem;
    }
}

/* Enhanced Educational Philosophy Modal for Mobile and Dark Theme */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    padding: 1rem;
}

[data-theme="dark"] .modal-overlay,
[data-theme="auto"] .modal-overlay {
    background: rgba(0, 0, 0, 0.85);
}

.modal-overlay.show {
    opacity: 1;
    visibility: visible;
}

.modal-container {
    background: var(--background-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-heavy);
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.8) translateY(50px);
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative;
}

@media (min-width: 768px) {
    .modal-container {
        width: 90%;
    }
}

.modal-overlay.show .modal-container {
    transform: scale(1) translateY(0);
}

.modal-content {
    padding: 1.5rem;
}

@media (min-width: 768px) {
    .modal-content {
        padding: 2.5rem;
    }
}

.modal-header {
    text-align: center;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1.25rem;
}

@media (min-width: 768px) {
    .modal-header {
        margin-bottom: 2.5rem;
        padding-bottom: 1.5rem;
    }
}

.modal-header h2 {
    color: var(--text-primary);
    font-size: clamp(1.5rem, 4vw, 2rem);
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.modal-subtitle {
    color: var(--text-secondary);
    font-size: clamp(0.875rem, 2.5vw, 1rem);
    font-style: italic;
    margin: 0;
}

.modal-body {
    margin-bottom: 2rem;
}

@media (min-width: 768px) {
    .modal-body {
        margin-bottom: 2.5rem;
    }
}

.philosophy-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding: 1.25rem;
    background: var(--background-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
    transition: var(--transition);
}

@media (min-width: 768px) {
    .philosophy-item {
        gap: 1.5rem;
        margin-bottom: 2rem;
        padding: 1.5rem;
    }
}

.philosophy-item:hover {
    transform: translateX(3px);
    box-shadow: var(--shadow-card);
    border-color: var(--border-color-secondary);
}

.philosophy-item:last-child {
    margin-bottom: 0;
}

.philosophy-number {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.1rem;
    flex-shrink: 0;
    box-shadow: var(--shadow-card);
}

@media (min-width: 768px) {
    .philosophy-number {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }
}

.philosophy-content {
    flex: 1;
    min-width: 0; /* Prevent flex item overflow */
}

.philosophy-chinese {
    color: var(--text-primary);
    font-size: clamp(0.95rem, 2.5vw, 1.1rem);
    font-weight: 500;
    line-height: 1.6;
    margin-bottom: 0.75rem;
}

.philosophy-english {
    color: var(--text-secondary);
    font-size: clamp(0.85rem, 2vw, 0.95rem);
    line-height: 1.5;
    margin: 0;
    font-style: italic;
}

.modal-footer {
    text-align: center;
    border-top: 1px solid var(--border-color);
    padding-top: 1.25rem;
}

@media (min-width: 768px) {
    .modal-footer {
        padding-top: 1.5rem;
    }
}

.btn-modal {
    padding: 1rem 1.5rem;
    font-size: clamp(0.95rem, 2.5vw, 1.1rem);
    min-width: 200px;
    width: 100%;
    max-width: 280px;
    position: relative;
    overflow: hidden;
}

@media (min-width: 768px) {
    .btn-modal {
        padding: 1rem 2rem;
        min-width: 250px;
        width: auto;
    }
}

.btn-modal .btn-subtitle {
    display: block;
    font-size: clamp(0.8rem, 2vw, 0.85rem);
    opacity: 0.8;
    margin-top: 0.25rem;
    font-weight: 400;
}

.btn-modal:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-heavy);
}

.btn-modal:active {
    transform: translateY(0);
}

/* Modal Animation Keyframes */
@keyframes modalFadeIn {
    from {
        opacity: 0;
        transform: scale(0.8) translateY(50px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

@keyframes modalFadeOut {
    from {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
    to {
        opacity: 0;
        transform: scale(0.8) translateY(50px);
    }
}

/* Body scroll lock when modal is open */
body.modal-open {
    overflow: hidden;
}

/* Success Toast Notification */
.success-toast {
    font-family: var(--font-family);
}

.toast-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.toast-icon {
    font-size: 1.5rem;
}

.toast-text {
    font-size: 0.9rem;
    line-height: 1.4;
}

/* Modal Responsive Design */
@media (max-width: 768px) {
    .modal-container {
        width: 95%;
        margin: 1rem;
    }

    .modal-content {
        padding: 2rem 1.5rem;
    }

    .modal-header h2 {
        font-size: 1.75rem;
    }

    .philosophy-item {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }

    .philosophy-number {
        align-self: center;
    }

    .philosophy-chinese {
        font-size: 1rem;
    }

    .philosophy-english {
        font-size: 0.9rem;
    }

    .btn-modal {
        min-width: 200px;
        padding: 0.875rem 1.5rem;
    }
}

@media (max-width: 480px) {
    .modal-container {
        width: 98%;
        margin: 0.5rem;
    }

    .modal-content {
        padding: 1.5rem 1rem;
    }

    .modal-header {
        margin-bottom: 2rem;
    }

    .modal-body {
        margin-bottom: 2rem;
    }

    .philosophy-item {
        padding: 1rem;
        margin-bottom: 1.5rem;
    }

    .philosophy-chinese {
        font-size: 0.95rem;
    }

    .philosophy-english {
        font-size: 0.85rem;
    }
}

/* Dark Theme Specific Enhancements */
[data-theme="dark"] .hero,
[data-theme="auto"] .hero {
    background: linear-gradient(135deg, var(--background-primary) 0%, var(--background-secondary) 100%);
}

[data-theme="dark"] .navbar,
[data-theme="auto"] .navbar {
    background: rgba(28, 28, 30, 0.95) !important;
    border-bottom-color: var(--border-color);
}

[data-theme="dark"] .floating-card,
[data-theme="auto"] .floating-card {
    background: var(--background-elevated);
    border: 1px solid var(--border-color);
}

[data-theme="dark"] .btn-primary,
[data-theme="auto"] .btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    box-shadow: var(--shadow-card);
}

[data-theme="dark"] .btn-secondary,
[data-theme="auto"] .btn-secondary {
    background: var(--background-elevated);
    border-color: var(--border-color);
    color: var(--text-primary);
}

/* Fix dark theme text visibility */
[data-theme="dark"] .hero-title,
[data-theme="dark"] .hero-subtitle,
[data-theme="dark"] .hero-description,
[data-theme="auto"] .hero-title,
[data-theme="auto"] .hero-subtitle,
[data-theme="auto"] .hero-description {
    color: var(--text-primary);
}

[data-theme="dark"] .section-header h2,
[data-theme="dark"] .about-card h3,
[data-theme="dark"] .subject-card h3,
[data-theme="dark"] .testimonial-card h4,
[data-theme="auto"] .section-header h2,
[data-theme="auto"] .about-card h3,
[data-theme="auto"] .subject-card h3,
[data-theme="auto"] .testimonial-card h4 {
    color: var(--text-primary);
}

[data-theme="dark"] .testimonial-content p,
[data-theme="auto"] .testimonial-content p {
    color: var(--text-primary);
}

/* Fix step cards in dark theme */
[data-theme="dark"] .step,
[data-theme="auto"] .step {
    background: var(--background-elevated);
    border-color: var(--border-color);
}

[data-theme="dark"] .step h3,
[data-theme="dark"] .step p,
[data-theme="auto"] .step h3,
[data-theme="auto"] .step p {
    color: var(--text-primary);
}

/* Fix testimonial cards in dark theme */
[data-theme="dark"] .testimonial-card,
[data-theme="auto"] .testimonial-card {
    background: var(--background-elevated);
    border-color: var(--border-color);
}

[data-theme="dark"] .testimonial-card p,
[data-theme="dark"] .testimonial-card .testimonial-author,
[data-theme="auto"] .testimonial-card p,
[data-theme="auto"] .testimonial-card .testimonial-author {
    color: var(--text-primary);
}

/* Improved focus states for dark theme */
[data-theme="dark"] .form-group input:focus,
[data-theme="dark"] .form-group select:focus,
[data-theme="dark"] .form-group textarea:focus,
[data-theme="auto"] .form-group input:focus,
[data-theme="auto"] .form-group select:focus,
[data-theme="auto"] .form-group textarea:focus {
    box-shadow: 0 0 0 3px rgba(10, 132, 255, 0.25);
    border-color: var(--primary-color);
}

/* Enhanced card hover effects for dark theme */
[data-theme="dark"] .about-card:hover,
[data-theme="dark"] .subject-card:hover,
[data-theme="dark"] .testimonial-card:hover,
[data-theme="auto"] .about-card:hover,
[data-theme="auto"] .subject-card:hover,
[data-theme="auto"] .testimonial-card:hover {
    background: var(--background-tertiary);
    border-color: var(--border-color-secondary);
}

/* Utility Classes */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

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

.mb-2 {
    margin-bottom: 2rem;
}

.mt-2 {
    margin-top: 2rem;
}

/* Performance optimizations */
* {
    -webkit-tap-highlight-color: transparent;
}

.btn,
.control-btn,
.nav-link {
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* Enhanced Accessibility Styles */
.sr-only {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

/* Keyboard navigation focus styles */
.keyboard-navigation *:focus {
    outline: 3px solid var(--primary-color) !important;
    outline-offset: 2px !important;
}

/* Enhanced focus states */
.btn:focus-visible,
.control-btn:focus-visible,
.nav-link:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

.form-group input:focus-visible,
.form-group select:focus-visible,
.form-group textarea:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-secondary: #000000;
        --shadow-light: 0 2px 4px rgba(0, 0, 0, 0.8);
        --shadow-medium: 0 4px 8px rgba(0, 0, 0, 0.8);
    }

    .btn-secondary {
        border-width: 2px;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .floating-card {
        animation: none !important;
    }
}

/* Form field states */
.form-group.focused label {
    color: var(--primary-color);
    transform: translateY(-2px);
}

.form-group.filled label {
    color: var(--text-primary);
}

.form-group.error label {
    color: var(--error-color);
}

.form-group.success label {
    color: var(--success-color);
}

/* Additional dark theme fixes for footer */
[data-theme="dark"] .footer,
[data-theme="auto"] .footer {
    background: var(--background-secondary) !important;
    color: var(--text-primary) !important;
    border-top-color: var(--border-color);
}

[data-theme="dark"] .footer-section h3,
[data-theme="dark"] .footer-section h4,
[data-theme="auto"] .footer-section h3,
[data-theme="auto"] .footer-section h4 {
    color: var(--text-primary) !important;
}

[data-theme="dark"] .footer-section a,
[data-theme="auto"] .footer-section a {
    color: var(--text-secondary) !important;
}

[data-theme="dark"] .footer-section a:hover,
[data-theme="auto"] .footer-section a:hover {
    color: var(--primary-color) !important;
}

[data-theme="dark"] .footer-bottom,
[data-theme="auto"] .footer-bottom {
    color: var(--text-secondary) !important;
    border-top-color: var(--border-color);
}