/* ===========================================================================
   ZenWei ERP Landing Page Styles
   =========================================================================== */

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --primary-bg: #eff6ff;
    --accent: #06b6d4;
    --dark: #0f172a;
    --gray-900: #111827;
    --gray-700: #374151;
    --gray-500: #6b7280;
    --gray-300: #d1d5db;
    --gray-100: #f3f4f6;
    --gray-50: #f9fafb;
    --white: #ffffff;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow-sm: 0 1px 2px 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-lg: 0 10px 30px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --max-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
        'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    color: var(--gray-900);
    line-height: 1.6;
    background: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: inherit;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===========================================================================
   Buttons
   =========================================================================== */

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    background: var(--primary);
    color: var(--white);
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 15px;
    transition: background 0.2s, transform 0.1s;
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 15px;
    transition: all 0.2s;
    cursor: pointer;
}

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

.btn-link {
    color: var(--gray-700);
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

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

.btn-lg {
    padding: 14px 32px;
    font-size: 16px;
}

/* ===========================================================================
   Header
   =========================================================================== */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--gray-100);
    transition: box-shadow 0.3s;
}

.site-header.scrolled {
    box-shadow: var(--shadow-sm);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 18px;
    color: var(--dark);
}

.logo-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: var(--white);
    border-radius: 8px;
    font-weight: 800;
    font-size: 18px;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: var(--gray-700);
    font-size: 15px;
    font-weight: 500;
    transition: color 0.2s;
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

/* ===========================================================================
   Hero
   =========================================================================== */

.hero {
    padding: 140px 0 80px;
    background: linear-gradient(180deg, var(--primary-bg) 0%, var(--white) 100%);
    overflow: hidden;
}

.hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: 999px;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 24px;
}

.hero h1 {
    font-size: 48px;
    font-weight: 800;
    line-height: 1.2;
    color: var(--dark);
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.hero-desc {
    font-size: 18px;
    color: var(--gray-500);
    margin-bottom: 32px;
    line-height: 1.7;
}

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

/* Dashboard Preview Mock */
.hero-visual {
    display: flex;
    justify-content: center;
}

.dashboard-preview {
    width: 100%;
    max-width: 500px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    border: 1px solid var(--gray-100);
}

.preview-bar {
    display: flex;
    gap: 6px;
    padding: 12px 16px;
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-100);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ef4444; }
.dot.yellow { background: #f59e0b; }
.dot.green { background: #10b981; }

.preview-body {
    display: flex;
    min-height: 320px;
}

.preview-sidebar {
    width: 56px;
    padding: 16px 12px;
    background: var(--gray-50);
    border-right: 1px solid var(--gray-100);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.preview-nav-item {
    height: 28px;
    border-radius: 6px;
    background: var(--gray-100);
}

.preview-nav-item.active {
    background: var(--primary-light);
    opacity: 0.6;
}

.preview-main {
    flex: 1;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.preview-card {
    background: var(--gray-50);
    border-radius: var(--radius-sm);
    height: 60px;
}

.preview-card.tall {
    height: 140px;
    flex-shrink: 0;
}

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

/* ===========================================================================
   Sections
   =========================================================================== */

.section {
    padding: 80px 0;
}

.section-alt {
    background: var(--gray-50);
}

.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-header h2 {
    font-size: 36px;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 12px;
}

.section-header p {
    font-size: 18px;
    color: var(--gray-500);
}

/* ===========================================================================
   Feature Grid
   =========================================================================== */

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    padding: 32px;
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius);
    transition: box-shadow 0.3s, transform 0.2s;
}

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

.feature-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 15px;
    color: var(--gray-500);
    line-height: 1.6;
}

/* ===========================================================================
   AI Grid
   =========================================================================== */

.ai-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.ai-feature {
    padding: 32px;
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius);
    border-left: 4px solid var(--primary);
}

.ai-feature h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}

.ai-feature p {
    font-size: 15px;
    color: var(--gray-500);
}

/* ===========================================================================
   Solution Grid
   =========================================================================== */

.solution-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.solution-card {
    padding: 32px;
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius);
}

.solution-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}

.solution-card p {
    font-size: 15px;
    color: var(--gray-500);
}

/* ===========================================================================
   Tech Grid
   =========================================================================== */

.tech-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    max-width: 900px;
    margin: 0 auto;
}

.tech-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 20px;
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius-sm);
}

.tech-label {
    font-size: 13px;
    color: var(--gray-500);
    font-weight: 500;
}

.tech-value {
    font-size: 15px;
    color: var(--dark);
    font-weight: 600;
}

/* ===========================================================================
   CTA Section
   =========================================================================== */

.cta-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    text-align: center;
}

.cta-section h2 {
    font-size: 36px;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 12px;
}

.cta-section p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 32px;
}

.cta-section .btn-primary {
    background: var(--white);
    color: var(--primary);
}

.cta-section .btn-primary:hover {
    background: var(--gray-100);
}

/* ===========================================================================
   Footer
   =========================================================================== */

.site-footer {
    background: var(--dark);
    color: var(--gray-300);
    padding-top: 64px;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding-bottom: 48px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.footer-name {
    font-size: 18px;
    font-weight: 700;
    color: var(--white);
}

.footer-tagline {
    font-size: 14px;
    color: var(--gray-500);
}

.footer-links {
    display: flex;
    gap: 64px;
}

.footer-col h4 {
    color: var(--white);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-col a {
    display: block;
    color: var(--gray-300);
    font-size: 14px;
    margin-bottom: 8px;
    transition: color 0.2s;
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 24px 0;
    font-size: 14px;
    color: var(--gray-500);
}

/* ===========================================================================
   Responsive
   =========================================================================== */

@media (max-width: 968px) {
    .hero-inner {
        grid-template-columns: 1fr;
    }

    .hero-visual {
        order: -1;
    }

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

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

@media (max-width: 640px) {
    .nav-links {
        display: none;
    }

    .hero h1 {
        font-size: 32px;
    }

    .hero-desc {
        font-size: 16px;
    }

    .section-header h2 {
        font-size: 28px;
    }

    .feature-grid,
    .solution-grid,
    .tech-grid {
        grid-template-columns: 1fr;
    }

    .footer-inner {
        flex-direction: column;
        gap: 32px;
    }

    .footer-links {
        gap: 32px;
    }

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