/* Modern AI Education Platform Styles */

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

:root {
    /* Color System */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-900: #1e3a8a;
    
    --secondary-500: #8b5cf6;
    --secondary-600: #7c3aed;
    
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    --success-500: #10b981;
    --warning-500: #f59e0b;
    --error-500: #ef4444;
    
    /* Typography */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Improved Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-500);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-600);
}

/* Modern Typography */
body {
    font-family: 'Inter', 'Microsoft JhengHei', 'PingFang TC', system-ui, -apple-system, sans-serif;
    font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--gray-50);
}

/* Modern Hero Section */
.hero-bg {
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--secondary-600) 100%);
    position: relative;
    overflow: hidden;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 50%, rgba(255,255,255,0.1) 0%, transparent 50%);
    opacity: 0.8;
}

.hero-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="60" height="60" viewBox="0 0 60 60"><g fill="none" fill-rule="evenodd"><g fill="rgba(255,255,255,0.05)" fill-opacity="0.4"><circle cx="30" cy="30" r="1"/></g></svg>');
}

/* Floating Particles Animation */
.particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.particle {
    position: absolute;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    animation: float 8s ease-in-out infinite;
}

.particle:nth-child(1) { width: 4px; height: 4px; left: 10%; animation-delay: 0s; }
.particle:nth-child(2) { width: 6px; height: 6px; left: 20%; animation-delay: -2s; }
.particle:nth-child(3) { width: 3px; height: 3px; left: 30%; animation-delay: -4s; }
.particle:nth-child(4) { width: 5px; height: 5px; left: 40%; animation-delay: -6s; }
.particle:nth-child(5) { width: 4px; height: 4px; left: 50%; animation-delay: -1s; }
.particle:nth-child(6) { width: 6px; height: 6px; left: 60%; animation-delay: -3s; }
.particle:nth-child(7) { width: 3px; height: 3px; left: 70%; animation-delay: -5s; }
.particle:nth-child(8) { width: 5px; height: 5px; left: 80%; animation-delay: -7s; }
.particle:nth-child(9) { width: 4px; height: 4px; left: 90%; animation-delay: -2.5s; }

@keyframes float {
    0%, 100% { 
        transform: translateY(0px) translateX(0px);
        opacity: 0.7;
    }
    25% { 
        transform: translateY(-30px) translateX(10px);
        opacity: 1;
    }
    50% { 
        transform: translateY(-15px) translateX(-10px);
        opacity: 0.8;
    }
    75% { 
        transform: translateY(-25px) translateX(5px);
        opacity: 0.9;
    }
}

/* Modern Button Styles */
.btn-primary {
    background: var(--primary-600);
    color: white;
    border: none;
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left var(--transition-slow);
}

.btn-primary:hover {
    background: var(--primary-700);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

.btn-secondary:hover {
    background: white;
    color: var(--primary-600);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Modern Card Styles */
.modern-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.modern-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-500), var(--secondary-500));
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.modern-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-200);
}

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

/* Service Icons */
.service-icon {
    width: 4rem;
    height: 4rem;
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-6);
    position: relative;
    overflow: hidden;
    transition: all var(--transition-base);
}

.service-icon::before {
    content: '';
    position: absolute;
    inset: 0;
    background: inherit;
    opacity: 0.1;
    transition: opacity var(--transition-base);
}

.service-icon:hover {
    transform: scale(1.1) rotate(5deg);
}

.service-icon:hover::before {
    opacity: 0.2;
}

/* Modern Navigation */
.navbar-scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
}

/* Statistics Counter */
.counter {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

/* News Marquee */
.marquee {
    background: var(--primary-600);
    color: white;
    padding: var(--space-3) 0;
    overflow: hidden;
    position: relative;
}

.marquee-content {
    display: flex;
    animation: marquee 45s linear infinite;
    white-space: nowrap;
}

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

/* Form Styles */
.form-input {
    width: 100%;
    padding: var(--space-4);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
    background: white;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

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

/* Loading Animation */
#loading-screen {
    background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
    z-index: 9999;
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.5rem;
    }
    
    .hero-bg {
        min-height: 80vh;
        padding: var(--space-16) 0;
    }
    
    .modern-card {
        padding: var(--space-6);
    }
    
    .counter {
        font-size: var(--font-size-4xl);
    }
    
    .service-icon {
        width: 3rem;
        height: 3rem;
    }
}

@media (max-width: 480px) {
    .hero-bg {
        min-height: 70vh;
    }
    
    .btn-primary,
    .btn-secondary {
        padding: var(--space-3) var(--space-4);
        font-size: var(--font-size-sm);
    }
    
    .modern-card {
        padding: var(--space-4);
        margin-bottom: var(--space-6);
    }
}

/* Enhanced Animations */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s ease-out forwards;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.stagger-animation {
    animation-delay: calc(var(--stagger) * 150ms);
}

/* Accessibility Improvements */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .particles {
        display: none;
    }
}

/* Focus Styles */
.btn-primary:focus,
.btn-secondary:focus,
.form-input:focus {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .hero-bg {
        background: var(--primary-900);
    }
    
    .modern-card {
        border: 2px solid var(--gray-800);
    }
}

/* 動畫效果 */
.fade-in {
    animation: fadeIn 0.8s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.slide-in-left {
    animation: slideInLeft 1s ease-out;
}

@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-50px); }
    to { opacity: 1; transform: translateX(0); }
}

.slide-in-right {
    animation: slideInRight 1s ease-out;
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(50px); }
    to { opacity: 1; transform: translateX(0); }
}

/* 圖片懸停效果 */
.image-hover {
    transition: all 0.3s ease;
    overflow: hidden;
}

.image-hover img {
    transition: transform 0.3s ease;
}

.image-hover:hover img {
    transform: scale(1.05);
}

/* 漸變文字 */
.gradient-text {
    background: linear-gradient(45deg, #3B82F6, #8B5CF6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 卡片懸停效果 */
.card-hover {
    transition: all 0.3s ease;
}

.card-hover:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
} 

/* Partner Logo Scroll Animation */
@keyframes scroll {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}

.animate-scroll {
    animation: scroll 30s linear infinite;
}

/* Pause animation on hover */
.animate-scroll:hover {
    animation-play-state: paused;
}

/* Ensure smooth scrolling on mobile */
@media (max-width: 768px) {
    .animate-scroll {
        animation-duration: 20s;
    }
}