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

:root {
    --primary-color: #4f6ed8;
    --primary-dark: #3d5bc4;
    --secondary-color: #9333ea;
    --accent-color: #ff8c42;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-light: #f5f5f5;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --gradient-1: linear-gradient(90deg, #4f6ed8 0%, #9333ea 100%);
    --gradient-2: linear-gradient(135deg, #4f6ed8 0%, #6b46c1 50%, #9333ea 100%);
    --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.logo-icon {
    font-size: 2rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-menu a:hover::after {
    width: 100%;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-1);
    opacity: 0.1;
    z-index: -1;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.1) 0%, transparent 70%);
    animation: pulse 15s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.hero-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 4rem;
    flex-wrap: wrap;
}

.btn {
    padding: 1rem 2rem;
    border-radius: 0.5rem;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.register-link {
    background: var(--gradient-1);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 0.4rem;
    font-weight: 600;
    transition: opacity 0.3s ease;
}

.register-link:hover {
    opacity: 0.9;
    color: white;
}

.register-link::after {
    display: none;
}

.btn-primary {
    background: var(--gradient-1);
    color: white;
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

/* Section Styles */
section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

/* Why CardHome Exists Section */
.why-exists {
    background: var(--bg-light);
}

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

.problem-card {
    background: white;
    padding: 2.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    text-align: center;
    border: 1px solid rgba(79, 110, 216, 0.1);
}

.problem-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

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

.problem-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

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

.solution-card {
    background: white;
    padding: 2.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    text-align: center;
    border: 1px solid rgba(79, 110, 216, 0.1);
    margin-top: 2rem;
}

.solution-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

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

.solution-card h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

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

/* Features Section */
.features {
    background: var(--bg-light);
}

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

.feature-card {
    background: white;
    padding: 2.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    text-align: center;
    border: 1px solid rgba(79, 110, 216, 0.1);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

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

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

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

.feature-card h3 {
    margin-bottom: 0;
}

/* Supported Cards Section */
.supported-cards {
    background: var(--bg-light);
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.card-brand {
    background: var(--gradient-1);
    padding: 3rem;
    border-radius: 1.5rem;
    text-align: center;
    color: white;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
}

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

.card-brand.coming-soon {
    background: var(--bg-light);
    color: var(--text-primary);
    border: 2px dashed var(--border-color);
}

.card-brand-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.card-brand h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: inherit;
}

.card-brand p {
    font-size: 1rem;
    line-height: 1.7;
    opacity: 0.9;
}

.card-brand.coming-soon p {
    opacity: 0.7;
}

.card-brand h3 {
    margin-bottom: 0;
}

/* Rewards Section */
.rewards {
    background: var(--bg-light);
}

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

.rewards-list {
    margin: 2rem 0;
}

.reward-item {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    align-items: center;
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: 0.75rem;
    transition: all 0.3s ease;
}

.reward-item:hover {
    background: white;
    box-shadow: var(--shadow-md);
    transform: translateX(5px);
}

.reward-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
}

.reward-details h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

.reward-details h3 {
    margin-bottom: 0;
}

.rewards-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.reward-card-visual {
    position: relative;
    width: 100%;
    max-width: 400px;
    aspect-ratio: 1.6;
    background: var(--gradient-1);
    border-radius: 1.5rem;
    padding: 2rem;
    box-shadow: var(--shadow-xl);
    transform: perspective(1000px) rotateY(-5deg);
    transition: transform 0.3s ease;
}

.reward-card-visual:hover {
    transform: perspective(1000px) rotateY(0deg);
}

.card-glow {
    position: absolute;
    top: -20px;
    right: -20px;
    width: 100px;
    height: 100px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    filter: blur(40px);
}

.card-content {
    position: relative;
    z-index: 1;
    color: white;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.card-chip {
    width: 50px;
    height: 40px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    margin-bottom: auto;
}

.card-number {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 2px;
    margin-bottom: 1rem;
}

.card-info {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.card-name,
.card-expiry {
    font-size: 0.9rem;
    font-weight: 500;
}

/* How It Works Section */
.how-it-works {
    background: var(--bg-light);
}

.steps {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 2rem;
    position: relative;
}

.step {
    flex: 1;
    min-width: 200px;
    text-align: center;
    position: relative;
    padding: 1.5rem;
    background: white;
    border-radius: 1rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

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

.step-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--gradient-1);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 1.5rem;
    box-shadow: var(--shadow-lg);
}

.step-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

.step-content h3 {
    margin-bottom: 0;
}

.step-connector {
    flex: 0 0 40px;
    height: 2px;
    background: var(--gradient-1);
    margin-top: 30px;
    opacity: 0.3;
}

/* Apply Section */
.apply {
    background: var(--bg-light);
}

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

.apply-benefits {
    list-style: none;
    margin: 2rem 0;
}

.apply-benefits li {
    padding: 0.75rem 0;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.apply-form-wrapper {
    background: var(--bg-light);
    padding: 2.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
}

.apply-form h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.875rem;
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 110, 216, 0.1);
}

.register-alternative {
    margin-top: 1.5rem;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.register-alternative p {
    margin: 0.5rem 0;
}

.register-link-inline {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: opacity 0.3s ease;
}

.register-link-inline:hover {
    opacity: 0.8;
    text-decoration: underline;
}

.checkbox-group {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    margin-top: 0.25rem;
}

.checkbox-group label {
    margin-bottom: 0;
    font-weight: 400;
}

.checkbox-group a {
    color: var(--primary-color);
    text-decoration: none;
}

.checkbox-group a:hover {
    text-decoration: underline;
}

.btn-full {
    width: 100%;
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.footer-section h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

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

.footer-section ul li {
    margin-bottom: 0.75rem;
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: white;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: white;
    text-decoration: none;
    transition: all 0.3s ease;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.social-links a:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.social-links a svg {
    width: 24px;
    height: 24px;
}

/* X (Twitter) logo - 黑色 */
.social-link-x {
    color: #000000;
}

.social-link-x:hover {
    color: #000000;
}

/* YouTube logo - 红色 */
.social-link-youtube {
    color: #FF0000;
}

.social-link-youtube:hover {
    color: #FF0000;
}

/* TikTok logo - 黑色 */
.social-link-tiktok {
    color: #000000;
}

.social-link-tiktok:hover {
    color: #000000;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: white;
        width: 100%;
        padding: 2rem;
        box-shadow: var(--shadow-lg);
        transition: left 0.3s ease;
        gap: 1rem;
    }

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

    .mobile-menu-toggle {
        display: flex;
    }

    .hero {
        padding: 100px 0 60px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .hero-stats {
        gap: 2rem;
    }

    .rewards-content,
    .apply-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .steps {
        flex-direction: column;
    }

    .step-connector {
        display: none;
    }

    .features-grid,
    .problems-grid,
    .cards-grid {
        grid-template-columns: 1fr;
    }

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

    .problems-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .feature-card,
    .apply-form-wrapper {
        padding: 1.5rem;
    }
}

/* Smooth Scroll */
html {
    scroll-behavior: smooth;
}

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

.feature-card,
.step,
.reward-item {
    animation: fadeInUp 0.6s ease-out;
}