/* NetDisk - Enterprise Cloud Storage Theme */
:root {
    --primary: #0052CC;
    --primary-dark: #003d99;
    --primary-light: #4C9AFF;
    --secondary: #172B4D;
    --accent: #00B8D9;
    --success: #36B37E;
    --warning: #FFAB00;
    --danger: #FF5630;
    --dark: #091E42;
    --gray-900: #172B4D;
    --gray-800: #253858;
    --gray-700: #42526E;
    --gray-600: #5E6C84;
    --gray-500: #7A869A;
    --gray-400: #97A0AF;
    --gray-300: #C1C7D0;
    --gray-200: #DFE1E6;
    --gray-100: #EBECF0;
    --gray-50: #F4F5F7;
    --white: #FFFFFF;
    --shadow-sm: 0 1px 2px rgba(9, 30, 66, 0.08);
    --shadow: 0 4px 8px rgba(9, 30, 66, 0.1);
    --shadow-lg: 0 8px 24px rgba(9, 30, 66, 0.12);
    --shadow-xl: 0 16px 48px rgba(9, 30, 66, 0.15);
    --radius: 4px;
    --radius-lg: 8px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--gray-900);
    background: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    z-index: 1000;
    border-bottom: 1px solid var(--gray-200);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--gray-900);
}

.logo-icon svg {
    width: 32px;
    height: 32px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-item a {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 8px 16px;
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    border-radius: var(--radius);
    transition: background 0.2s, color 0.2s;
}

.nav-item a:hover {
    background: var(--gray-100);
    color: var(--primary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-text {
    padding: 8px 16px;
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
}

.btn-text:hover {
    color: var(--primary);
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--primary);
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: background 0.2s, transform 0.2s;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    background: transparent;
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    border-radius: var(--radius);
    border: 1px solid var(--gray-300);
    cursor: pointer;
    transition: all 0.2s;
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-ghost {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    background: transparent;
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    border: none;
    cursor: pointer;
}

.btn-ghost:hover {
    color: var(--primary);
}

.btn-large {
    padding: 14px 28px;
    font-size: 1rem;
}

.btn-block {
    display: block;
    width: 100%;
    text-align: center;
}

.btn-white {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    background: var(--white);
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

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

.btn-ghost-white {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    background: transparent;
    color: var(--white);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    border: 2px solid rgba(255,255,255,0.5);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
}

.btn-ghost-white:hover {
    background: rgba(255,255,255,0.1);
    border-color: var(--white);
}

/* Hero Section */
.hero {
    position: relative;
    padding: 140px 0 100px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
    z-index: -1;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content .badge {
    display: inline-block;
    padding: 6px 12px;
    background: rgba(0, 82, 204, 0.1);
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 20px;
    margin-bottom: 20px;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.2;
    color: var(--gray-900);
    margin-bottom: 20px;
}

.hero-content p {
    font-size: 1.15rem;
    color: var(--gray-600);
    margin-bottom: 32px;
    max-width: 500px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
}

.hero-trust {
    padding-top: 32px;
    border-top: 1px solid var(--gray-200);
}

.hero-trust span {
    display: block;
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-bottom: 16px;
}

.trust-logos {
    display: flex;
    gap: 32px;
}

.trust-logo {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--gray-400);
}

.hero-visual {
    display: flex;
    justify-content: center;
}

.dashboard-preview {
    width: 100%;
    max-width: 500px;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.preview-header {
    padding: 12px 16px;
    background: var(--gray-100);
    border-bottom: 1px solid var(--gray-200);
}

.preview-dots {
    display: flex;
    gap: 8px;
}

.preview-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--gray-300);
}

.preview-dots span:first-child { background: #FF5F57; }
.preview-dots span:nth-child(2) { background: #FEBC2E; }
.preview-dots span:last-child { background: #28C840; }

.preview-content {
    display: flex;
    min-height: 300px;
}

.preview-sidebar {
    width: 60px;
    background: var(--gray-50);
    padding: 16px 12px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.preview-menu-item {
    height: 36px;
    background: var(--gray-200);
    border-radius: var(--radius);
}

.preview-menu-item.active {
    background: var(--primary);
}

.preview-main {
    flex: 1;
    padding: 20px;
}

.preview-files {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.preview-file {
    aspect-ratio: 1;
    background: var(--gray-100);
    border-radius: var(--radius);
}

/* Stats Section */
.stats {
    padding: 60px 0;
    background: var(--gray-900);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.95rem;
    color: var(--gray-400);
}

/* Features Section */
.features {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--gray-600);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    padding: 32px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    transition: all 0.3s;
}

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

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 82, 204, 0.1);
    border-radius: var(--radius-lg);
    margin-bottom: 20px;
}

.feature-icon svg {
    width: 24px;
    height: 24px;
    stroke: var(--primary);
}

.feature-card h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--gray-600);
    line-height: 1.7;
}

/* Solutions Section */
.solutions {
    padding: 100px 0;
    background: var(--gray-50);
}

.solutions-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 48px;
}

.tab-btn {
    padding: 12px 24px;
    background: transparent;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-weight: 500;
    color: var(--gray-700);
    cursor: pointer;
    transition: all 0.2s;
}

.tab-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.tab-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--white);
}

.solution-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.solution-text h3 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
}

.solution-text p {
    color: var(--gray-600);
    margin-bottom: 24px;
}

.solution-features {
    list-style: none;
    margin-bottom: 32px;
}

.solution-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 0;
    color: var(--gray-700);
}

.solution-features svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.solution-image {
    display: flex;
    justify-content: center;
}

.solution-card {
    background: var(--white);
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: flex-start;
    gap: 20px;
    max-width: 400px;
}

.card-icon {
    font-size: 2.5rem;
}

.card-content h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.card-content p {
    font-size: 0.95rem;
    color: var(--gray-600);
}

/* Pricing Section */
.pricing-section {
    padding: 100px 0;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.pricing-card {
    position: relative;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    transition: all 0.3s;
}

.pricing-card:hover {
    box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
    border: 2px solid var(--primary);
    transform: scale(1.05);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: 4px 16px;
    background: var(--primary);
    color: var(--white);
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 20px;
}

.pricing-header {
    text-align: center;
    margin-bottom: 32px;
}

.pricing-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 16px;
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
}

.price .currency {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-700);
}

.price .amount {
    font-size: 3rem;
    font-weight: 700;
    color: var(--gray-900);
}

.price .period {
    font-size: 0.9rem;
    color: var(--gray-500);
}

.pricing-features {
    list-style: none;
    margin-bottom: 32px;
}

.pricing-features li {
    padding: 12px 0;
    color: var(--gray-700);
    border-bottom: 1px solid var(--gray-100);
    font-size: 0.95rem;
}

.pricing-features li:last-child {
    border-bottom: none;
}

/* CTA Section */
.cta-section {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.cta-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
}

.cta-content p {
    font-size: 1.15rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 32px;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
}

/* Footer */
.footer {
    background: var(--gray-900);
    color: var(--gray-400);
    padding: 80px 0 40px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 60px;
}

.footer-brand .logo {
    color: var(--white);
    margin-bottom: 16px;
}

.footer-brand p {
    font-size: 0.95rem;
    margin-bottom: 20px;
}

.social-links {
    display: flex;
    gap: 16px;
}

.social-links a {
    color: var(--gray-500);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.social-links a:hover {
    color: var(--white);
}

.footer-links h4 {
    color: var(--white);
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-links a {
    display: block;
    color: var(--gray-500);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 8px 0;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--white);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 40px;
    border-top: 1px solid var(--gray-800);
}

.footer-bottom p {
    font-size: 0.9rem;
}

.footer-legal {
    display: flex;
    gap: 24px;
}

.footer-legal a {
    color: var(--gray-500);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.footer-legal a:hover {
    color: var(--white);
}

/* Auth Pages */
.auth-container {
    min-height: 100vh;
    display: flex;
}

.auth-left {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.auth-right {
    flex: 1;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.auth-form-container {
    width: 100%;
    max-width: 400px;
}

.auth-form-container h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.auth-form-container .subtitle {
    color: var(--gray-600);
    margin-bottom: 32px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 8px;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 82, 204, 0.1);
}

.auth-info {
    text-align: center;
    color: var(--white);
}

.auth-info h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.auth-info p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Responsive */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content p {
        margin: 0 auto 32px;
    }

    .hero-cta {
        justify-content: center;
    }

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

    .trust-logos {
        justify-content: center;
    }

    .hero-visual {
        display: none;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }

    .pricing-card.featured {
        transform: none;
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu,
    .nav-actions {
        display: none;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .solutions-tabs {
        flex-wrap: wrap;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 16px;
    }
}