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

:root {
    --primary-color: #2563eb;
    --secondary-color: #7c3aed;
    --dark-bg: #0f172a;
    --light-bg: #f8fafc;
    --text-dark: #1e293b;
    --text-light: #64748b;
    --accent: #f59e0b;
    --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-alt: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: 1rem 0;
}

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

.nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s ease;
}

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    color: white;
    text-align: center;
    padding: 8rem 2rem 4rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    animation: fadeInUp 1s ease;
}

.hero-subtitle {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    opacity: 0.95;
    animation: fadeInUp 1s ease 0.2s both;
}

.hero-description {
    font-size: 1.3rem;
    max-width: 800px;
    margin: 0 auto 3rem;
    opacity: 0.9;
    line-height: 1.8;
    animation: fadeInUp 1s ease 0.4s both;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    animation: fadeInUp 1s ease 0.6s both;
}

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

/* Buttons */
.btn {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: white;
    color: var(--primary-color);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

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

.btn-large {
    padding: 1.2rem 3rem;
    font-size: 1.2rem;
}

/* Sections */
.section {
    padding: 6rem 0;
}

.section-title {
    font-size: 3rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-dark {
    background: var(--dark-bg);
    color: white;
}

.bg-dark .section-title {
    -webkit-text-fill-color: white;
    background: none;
}

.bg-gradient {
    background: var(--gradient);
    color: white;
}

.bg-gradient .section-title {
    color: white;
}

/* Mission Section */
.mission-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.mission-card {
    background: white;
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.mission-card:hover {
    transform: translateY(-5px);
}

.mission-card h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.mission-card ul {
    list-style: none;
}

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

.mission-card .icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.mission-card strong {
    display: block;
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.mission-card p {
    color: var(--text-light);
    line-height: 1.6;
}

.mission-statement {
    background: var(--light-bg);
    padding: 3rem;
    border-radius: 20px;
    text-align: center;
}

.lead {
    font-size: 1.3rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

/* Vision Section */
.vision-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.vision-card {
    background: rgba(255, 255, 255, 0.1);
    padding: 2rem;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.vision-card:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-5px);
}

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

.vision-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.vision-card p {
    opacity: 0.9;
    line-height: 1.6;
    margin-bottom: 0.8rem;
}

.chinese {
    font-style: italic;
    opacity: 0.8;
    font-size: 0.95rem;
}

.quote-box {
    background: rgba(255, 255, 255, 0.1);
    padding: 3rem;
    border-radius: 20px;
    margin: 3rem 0;
    border-left: 4px solid white;
}

.quote-box blockquote {
    font-size: 1.5rem;
    line-height: 1.8;
    font-style: italic;
}

.quote-box em {
    display: block;
    margin-top: 1rem;
    font-size: 1.1rem;
    opacity: 0.8;
}

.philosophy {
    background: rgba(255, 255, 255, 0.05);
    padding: 2rem;
    border-radius: 15px;
    margin-top: 2rem;
}

.philosophy p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.translation {
    opacity: 0.7;
    font-size: 0.95rem;
}

/* Highlights Section */
.highlight-banner {
    background: var(--gradient);
    color: white;
    padding: 3rem;
    border-radius: 20px;
    text-align: center;
    margin-bottom: 3rem;
}

.highlight-banner .quote {
    font-size: 2rem;
    font-weight: 600;
    font-style: italic;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature {
    background: var(--light-bg);
    padding: 2rem;
    border-radius: 20px;
    border-left: 4px solid var(--primary-color);
    transition: all 0.3s ease;
}

.feature:hover {
    transform: translateX(5px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

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

.feature p {
    margin-bottom: 0.8rem;
    line-height: 1.6;
}

/* UBI Section */
.ubi-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    align-items: center;
    margin-bottom: 3rem;
}

.ubi-description .lead {
    color: white;
    margin-bottom: 1.5rem;
}

.ubi-description p {
    margin-bottom: 1.5rem;
    line-height: 1.8;
    font-size: 1.1rem;
}

.ubi-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.ubi-circle {
    width: 250px;
    height: 250px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    border: 4px solid white;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.ubi-number {
    font-size: 4rem;
    font-weight: 800;
}

.ubi-label {
    font-size: 1.2rem;
    font-weight: 600;
    margin-top: 0.5rem;
}

.ubi-benefits {
    background: rgba(255, 255, 255, 0.15);
    padding: 2rem;
    border-radius: 20px;
    text-align: center;
}

.ubi-benefits h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.ubi-benefits p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1rem;
}

/* Platform Section */
.platform-grid {
    display: grid;
    gap: 2rem;
}

.platform-card {
    background: white;
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.platform-card h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.platform-card > p {
    margin-bottom: 1.5rem;
    line-height: 1.7;
    font-size: 1.1rem;
}

.verification-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.method {
    background: var(--light-bg);
    padding: 1.5rem;
    border-radius: 15px;
    border: 2px solid #e2e8f0;
}

.method h4 {
    font-size: 1.2rem;
    margin-bottom: 0.8rem;
    color: var(--text-dark);
}

.method p {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.5;
}

.identity-levels {
    margin-top: 3rem;
    background: var(--light-bg);
    padding: 2.5rem;
    border-radius: 20px;
}

.identity-levels h3 {
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
    color: var(--primary-color);
}

.levels {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.level {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 1.5rem;
    background: white;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

.level-badge {
    background: var(--gradient);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-weight: 600;
    white-space: nowrap;
}

.level p {
    line-height: 1.7;
}

.privacy-note {
    margin-top: 1.5rem;
    padding: 1rem;
    background: rgba(124, 58, 237, 0.1);
    border-radius: 10px;
    font-weight: 500;
    text-align: center;
}

/* Philosophy Section */
.philosophy-content {
    max-width: 900px;
    margin: 0 auto;
}

.philosophy-block {
    margin-bottom: 3rem;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    border-left: 4px solid var(--accent);
}

.philosophy-block h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--accent);
}

.philosophy-block p {
    margin-bottom: 1rem;
    line-height: 1.8;
    font-size: 1.05rem;
}

.quote-small {
    font-style: italic;
    opacity: 0.8;
    border-left: 3px solid rgba(255, 255, 255, 0.3);
    padding-left: 1rem;
    margin-top: 1rem;
}

/* CTA Section */
.cta-section {
    background: linear-gradient(135deg, #1e3a8a 0%, #1e40af 50%, #2563eb 100%);
    color: white;
    text-align: center;
}

.cta-section h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.cta-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin-top: 2rem;
}

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

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand h3 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-column h4 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
    color: var(--accent);
}

.footer-column a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    margin-bottom: 0.5rem;
    transition: color 0.3s ease;
}

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

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

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.3rem;
    }

    .hero-description {
        font-size: 1.1rem;
    }

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

    .section-title {
        font-size: 2rem;
    }

    .nav-links {
        display: none; /* Add mobile menu in future */
    }

    .mission-grid,
    .vision-cards,
    .features-grid,
    .platform-grid {
        grid-template-columns: 1fr;
    }

    .ubi-content {
        grid-template-columns: 1fr;
    }

    .ubi-circle {
        width: 200px;
        height: 200px;
    }

    .ubi-number {
        font-size: 3rem;
    }

    .verification-methods {
        grid-template-columns: 1fr;
    }

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

    .footer-links {
        grid-template-columns: 1fr;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
}

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

/* Selection Styling */
::selection {
    background: var(--primary-color);
    color: white;
}