/* ========================================
   CSS Variables & Base Styles
   ======================================== */
:root {
    /* Colors - Trust Blue + Orange CTA */
    --primary: #2563EB;
    --primary-dark: #1D4ED8;
    --primary-light: #3B82F6;
    --secondary: #0EA5E9;
    --cta: #F97316;
    --cta-hover: #EA580C;
    --background: #F8FAFC;
    --surface: #FFFFFF;
    --text-primary: #1E293B;
    --text-secondary: #475569;
    --text-muted: #64748B;
    --border: #E2E8F0;
    --border-light: #F1F5F9;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #2563EB 0%, #0EA5E9 100%);
    --gradient-hero: linear-gradient(135deg, #0F172A 0%, #1E293B 50%, #0F172A 100%);
    --gradient-cta: linear-gradient(135deg, #F97316 0%, #FB923C 100%);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Typography - 中文友好本地字体 */
    --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif;
    --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;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition: 200ms ease;
    --transition-slow: 300ms ease;
    
    /* Z-index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal: 400;
    --z-tooltip: 500;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

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

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul, ol {
    list-style: none;
}

/* ========================================
   Utility Classes
   ======================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (min-width: 640px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
}

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

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.75rem 1.5rem;
    font-size: var(--font-size-base);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition);
    cursor: pointer;
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-cta);
    color: white;
    box-shadow: 0 4px 14px 0 rgba(249, 115, 22, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 rgba(249, 115, 22, 0.5);
}

.btn-outline {
    background: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-white {
    background: white;
    color: var(--primary);
    box-shadow: var(--shadow-md);
}

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

.btn-lg {
    padding: 1rem 2rem;
    font-size: var(--font-size-lg);
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    padding: var(--spacing-md) 0;
    transition: all var(--transition-slow);
}

.navbar.scrolled {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-sm) 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: white;
}

.nav-logo i {
    font-size: 1.5rem;
    color: var(--cta);
}

.nav-menu {
    display: none;
    align-items: center;
    gap: var(--spacing-xl);
}

@media (min-width: 1024px) {
    .nav-menu {
        display: flex;
    }
}

.nav-link {
    color: rgba(255, 255, 255, 0.8);
    font-weight: 500;
    padding: var(--spacing-sm) 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--cta);
    transition: width var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: white;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-cta {
    background: var(--gradient-cta);
    color: white;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-full);
    font-weight: 500;
    transition: all var(--transition);
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(249, 115, 22, 0.4);
}

.nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    color: white;
    font-size: 1.5rem;
}

@media (min-width: 1024px) {
    .nav-toggle {
        display: none;
    }
}

/* Mobile Menu */
.nav-menu.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: var(--spacing-md);
    right: var(--spacing-md);
    background: rgba(15, 23, 42, 0.98);
    backdrop-filter: blur(10px);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    gap: var(--spacing-md);
    box-shadow: var(--shadow-xl);
}

.nav-menu.active .nav-link {
    padding: var(--spacing-sm) 0;
}

.nav-menu.active .nav-cta {
    width: 100%;
    text-align: center;
    margin-top: var(--spacing-sm);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--gradient-hero);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero-particles {
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(37, 99, 235, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(14, 165, 233, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(249, 115, 22, 0.1) 0%, transparent 40%);
}

.hero-container {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 120px var(--spacing-md) var(--spacing-3xl);
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

@media (min-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr 1fr;
        padding: 140px var(--spacing-xl) var(--spacing-3xl);
    }
}

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

@media (min-width: 1024px) {
    .hero-content {
        text-align: left;
    }
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: rgba(249, 115, 22, 0.15);
    color: var(--cta);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--spacing-lg);
    border: 1px solid rgba(249, 115, 22, 0.3);
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: white;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
}

@media (min-width: 768px) {
    .hero-title {
        font-size: var(--font-size-5xl);
    }
}

.hero-description {
    font-size: var(--font-size-lg);
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-xl);
    max-width: 500px;
}

@media (min-width: 1024px) {
    .hero-description {
        margin-left: 0;
        margin-right: auto;
    }
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

@media (min-width: 1024px) {
    .hero-stats {
        justify-content: flex-start;
    }
}

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

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: white;
}

.stat-suffix {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--cta);
}

.stat-label {
    display: block;
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
    margin-top: var(--spacing-xs);
}

.hero-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

@media (min-width: 640px) {
    .hero-actions {
        flex-direction: row;
        justify-content: center;
    }
}

@media (min-width: 1024px) {
    .hero-actions {
        justify-content: flex-start;
    }
}

.hero-trust {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--font-size-sm);
}

@media (min-width: 1024px) {
    .hero-trust {
        justify-content: flex-start;
    }
}

.hero-trust i {
    color: #22C55E;
}

/* Hero Visual */
.hero-visual {
    display: none;
    position: relative;
    justify-content: center;
    align-items: center;
}

@media (min-width: 1024px) {
    .hero-visual {
        display: flex;
    }
}

.phone-mockup {
    position: relative;
    width: 280px;
    height: 560px;
    background: linear-gradient(145deg, #1E293B, #0F172A);
    border-radius: 40px;
    padding: 12px;
    box-shadow: 
        0 50px 100px -20px rgba(0, 0, 0, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, #075985 0%, #0369A1 100%);
    border-radius: 32px;
    overflow: hidden;
}

.chat-demo {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.chat-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg) var(--spacing-md);
    background: rgba(0, 0, 0, 0.2);
    color: white;
    font-weight: 500;
}

.chat-header i {
    font-size: 1.5rem;
    color: #22C55E;
}

.chat-messages {
    flex: 1;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.message {
    max-width: 80%;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    animation: fadeInUp 0.5s ease forwards;
    opacity: 0;
}

.message.received {
    background: rgba(255, 255, 255, 0.95);
    color: var(--text-primary);
    align-self: flex-start;
    border-bottom-left-radius: 4px;
}

.message.sent {
    background: #22C55E;
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 4px;
}

.message:nth-child(1) { animation-delay: 0.5s; }
.message:nth-child(2) { animation-delay: 1s; }
.message:nth-child(3) { animation-delay: 1.5s; }

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Floating Cards */
.floating-card {
    position: absolute;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-primary);
    animation: float 3s ease-in-out infinite;
}

.floating-card i {
    font-size: 1.25rem;
}

.card-1 {
    top: 20%;
    right: -20px;
    animation-delay: 0s;
}

.card-1 i {
    color: #22C55E;
}

.card-2 {
    bottom: 25%;
    left: -30px;
    animation-delay: 1.5s;
}

.card-2 i {
    color: var(--primary);
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* Hero Scroll Indicator */
.hero-scroll {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
}

.hero-scroll a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: rgba(255, 255, 255, 0.5);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

/* ========================================
   Section Styles
   ======================================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-tag {
    display: inline-block;
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary);
    padding: 0.375rem 1rem;
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

@media (min-width: 768px) {
    .section-title {
        font-size: var(--font-size-4xl);
    }
}

.section-desc {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   Features Section
   ======================================== */
.features {
    padding: var(--spacing-3xl) 0;
    background: var(--background);
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

@media (min-width: 640px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

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

.feature-card {
    background: var(--surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    transition: all var(--transition);
    cursor: pointer;
}

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

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.feature-icon i {
    font-size: 1.5rem;
    color: white;
}

.feature-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========================================
   About Section
   ======================================== */
.about {
    padding: var(--spacing-3xl) 0;
    background: var(--surface);
}

.about-wrapper {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

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

.about-image {
    position: relative;
}

.about-img-container {
    position: relative;
    aspect-ratio: 4/3;
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.about-pattern {
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 30% 70%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 70% 30%, rgba(255, 255, 255, 0.15) 0%, transparent 50%);
}

.about-stats-card {
    position: absolute;
    bottom: var(--spacing-lg);
    left: var(--spacing-lg);
    right: var(--spacing-lg);
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    justify-content: space-around;
}

.about-stat {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.about-stat i {
    font-size: 1.5rem;
    color: var(--primary);
}

.about-stat strong {
    display: block;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
}

.about-stat span {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.about-content .section-tag {
    display: inline-block;
}

.about-content .section-title {
    text-align: left;
    margin-bottom: var(--spacing-lg);
}

.about-text {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.about-list {
    margin: var(--spacing-xl) 0;
}

.about-list li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

.about-list i {
    color: #22C55E;
    margin-top: 4px;
}

/* ========================================
   Testimonials Section
   ======================================== */
.testimonials {
    padding: var(--spacing-3xl) 0;
    background: var(--background);
}

.testimonials-slider {
    position: relative;
    overflow: hidden;
}

.testimonials-track {
    display: flex;
    gap: var(--spacing-lg);
    transition: transform var(--transition-slow);
}

.testimonial-card {
    flex: 0 0 100%;
    background: var(--surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
}

@media (min-width: 768px) {
    .testimonial-card {
        flex: 0 0 calc(50% - var(--spacing-md));
    }
}

@media (min-width: 1024px) {
    .testimonial-card {
        flex: 0 0 calc(33.333% - var(--spacing-md));
    }
}

.testimonial-rating {
    display: flex;
    gap: 2px;
    margin-bottom: var(--spacing-md);
}

.testimonial-rating i {
    color: #FBBF24;
    font-size: var(--font-size-sm);
}

.testimonial-text {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.author-avatar {
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
}

.author-avatar i {
    color: white;
    font-size: 1.25rem;
}

.author-info strong {
    display: block;
    color: var(--text-primary);
    font-weight: 600;
}

.author-info span {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.testimonials-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.testimonial-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    transition: all var(--transition);
    cursor: pointer;
}

.testimonial-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.testimonials-dots {
    display: flex;
    gap: var(--spacing-sm);
}

.testimonials-dots .dot {
    width: 8px;
    height: 8px;
    background: var(--border);
    border-radius: var(--radius-full);
    transition: all var(--transition);
    cursor: pointer;
}

.testimonials-dots .dot.active {
    width: 24px;
    background: var(--primary);
}

/* ========================================
   FAQ Section
   ======================================== */
.faq {
    padding: var(--spacing-3xl) 0;
    background: var(--surface);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    transition: all var(--transition);
}

.faq-item:hover {
    border-color: var(--primary);
}

.faq-item.active {
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    background: var(--surface);
    text-align: left;
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition);
}

.faq-question:hover {
    color: var(--primary);
}

.faq-question i {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    transition: transform var(--transition);
}

.faq-item.active .faq-question i {
    transform: rotate(45deg);
    color: var(--primary);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ========================================
   Links Section
   ======================================== */
.links-section {
    padding: var(--spacing-3xl) 0;
    background: var(--background);
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

@media (min-width: 640px) {
    .links-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1024px) {
    .links-grid {
        grid-template-columns: repeat(6, 1fr);
    }
}

.link-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: all var(--transition);
    cursor: pointer;
}

.link-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.link-card i {
    font-size: 1.75rem;
    color: var(--primary);
}

.link-card span {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-primary);
    text-align: center;
}

/* ========================================
   CTA Section
   ======================================== */
.cta-section {
    padding: var(--spacing-3xl) 0;
    background: var(--gradient-hero);
}

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

.cta-content h2 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: white;
    margin-bottom: var(--spacing-md);
}

@media (min-width: 768px) {
    .cta-content h2 {
        font-size: var(--font-size-4xl);
    }
}

.cta-content p {
    font-size: var(--font-size-lg);
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: #0F172A;
    color: rgba(255, 255, 255, 0.7);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-main {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

@media (min-width: 1024px) {
    .footer-main {
        grid-template-columns: 1.5fr 2fr;
    }
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: white;
    margin-bottom: var(--spacing-md);
}

.footer-logo i {
    color: var(--cta);
}

.footer-desc {
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.footer-social {
    display: flex;
    gap: var(--spacing-md);
}

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    color: white;
    transition: all var(--transition);
}

.footer-social a:hover {
    background: var(--primary);
    transform: translateY(-2px);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
}

@media (min-width: 768px) {
    .footer-links {
        grid-template-columns: repeat(3, 1fr);
    }
}

.footer-column h4 {
    color: white;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.footer-column ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-column a {
    color: rgba(255, 255, 255, 0.6);
    transition: color var(--transition);
}

.footer-column a:hover {
    color: white;
}

.footer-bottom {
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.copyright {
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-sm);
}

.footer-keywords {
    font-size: var(--font-size-xs);
    color: rgba(255, 255, 255, 0.4);
}

/* ========================================
   Back to Top Button
   ======================================== */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-cta);
    color: white;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition);
    z-index: var(--z-fixed);
    cursor: pointer;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(249, 115, 22, 0.4);
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

.slide-up {
    animation: slideUp 0.6s ease forwards;
}

/* Scroll Reveal */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   Responsive Adjustments
   ======================================== */
@media (max-width: 639px) {
    .hero-stats {
        gap: var(--spacing-lg);
    }
    
    .stat-number {
        font-size: var(--font-size-2xl);
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    .about-stats-card {
        flex-direction: column;
        gap: var(--spacing-md);
    }
}

/* Print Styles */
@media print {
    .navbar,
    .hero-scroll,
    .back-to-top,
    .cta-section {
        display: none;
    }
    
    .hero {
        min-height: auto;
        padding: var(--spacing-xl) 0;
    }
}