/* ============================================
   勤笃协同管理系统 - 主样式表
   ============================================ */

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

:root {
    --primary: #1a56db;
    --primary-dark: #1347b8;
    --primary-light: #e8f0fe;
    --accent: #0ea5e9;
    --text: #1e293b;
    --text-secondary: #64748b;
    --bg: #ffffff;
    --bg-alt: #f8fafc;
    --bg-footer: #0f172a;
    --border: #e2e8f0;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.08);
    --radius: 12px;
    --transition: 0.25s ease;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

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

a:hover {
    color: var(--primary-dark);
}

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

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

/* --- Header --- */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    transition: box-shadow var(--transition);
}

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

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.5px;
}

.logo-icon {
    font-size: 1.6rem;
    color: var(--primary);
}

.logo-text {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav {
    display: flex;
    gap: 28px;
}

.nav-link {
    font-size: 0.93rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 6px 0;
    border-bottom: 2px solid transparent;
    transition: color var(--transition), border-color var(--transition);
    white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
}

.nav-link.active {
    border-bottom-color: var(--primary);
}

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

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
}

/* --- Hero --- */
.hero {
    padding: 80px 0 100px;
    background: linear-gradient(180deg, #eff6ff 0%, var(--bg) 100%);
}

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

.hero-title {
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: -1px;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--text) 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
    line-height: 1.6;
}

.hero-desc {
    font-size: 0.95rem;
    color: #94a3b8;
    margin-bottom: 32px;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    border: 2px solid transparent;
    letter-spacing: 0.3px;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 4px 14px rgba(26, 86, 219, 0.35);
}

.btn-primary:hover {
    background: var(--primary-dark);
    box-shadow: 0 6px 20px rgba(26, 86, 219, 0.45);
    transform: translateY(-1px);
}

.btn-outline {
    border-color: var(--border);
    color: var(--text);
    background: var(--bg);
}

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

/* Hero Cards */
.hero-visual {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.hero-card {
    background: var(--bg);
    padding: 28px 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform var(--transition), box-shadow var(--transition);
}

.hero-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.hero-card-icon {
    font-size: 2rem;
    margin-bottom: 10px;
    color: var(--primary);
}

.hero-card-title {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.hero-card-desc {
    font-size: 0.82rem;
    color: var(--text-secondary);
}

/* --- Section Common --- */
.section-title {
    font-size: 2rem;
    font-weight: 800;
    text-align: center;
    letter-spacing: -0.5px;
}

.section-desc {
    text-align: center;
    color: var(--text-secondary);
    margin-top: 12px;
    margin-bottom: 48px;
    font-size: 1rem;
}

/* --- Features --- */
.features {
    padding: 80px 0;
}

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

.feature-item {
    background: var(--bg-alt);
    padding: 36px 28px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.feature-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    border-color: var(--primary-light);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.feature-item h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.feature-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.65;
}

/* --- Scenarios --- */
.scenarios {
    padding: 0 0 80px;
}

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

.scenario-item {
    background: linear-gradient(135deg, var(--primary-light), #f0f9ff);
    padding: 32px 28px;
    border-radius: var(--radius);
    text-align: center;
}

.scenario-item h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--primary);
}

.scenario-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* --- Footer --- */
.footer {
    background: var(--bg-footer);
    padding: 32px 0;
    color: #94a3b8;
    margin-top: auto;
}

.footer-info {
    text-align: center;
}

.footer-info p {
    font-size: 0.88rem;
    line-height: 2;
}

.footer-policy-links {
    margin-bottom: 4px;
}

.footer-policy-links a {
    color: #94a3b8;
    font-size: 0.88rem;
    transition: color var(--transition);
}

.footer-policy-links a:hover {
    color: #cbd5e1;
}

.footer-sep {
    margin: 0 10px;
    color: #475569;
}

.footer-info a {
    color: #94a3b8;
    font-size: 0.88rem;
    transition: color var(--transition);
}

.footer-info a:hover {
    color: #cbd5e1;
}

.footer-disclaimer {
    font-size: 0.8rem !important;
    color: #64748b;
    max-width: 700px;
    margin: 8px auto 0;
    line-height: 1.6 !important;
}

/* --- Page Hero (sub pages) --- */
.page-hero {
    padding: 60px 0;
    background: linear-gradient(180deg, #eff6ff 0%, var(--bg) 100%);
    text-align: center;
    border-bottom: 1px solid var(--border);
}

.page-hero h1 {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.page-hero p {
    color: var(--text-secondary);
    margin-top: 8px;
    font-size: 1rem;
}

/* --- Product Detail --- */
.product-detail {
    padding: 60px 0 80px;
}

.product-module {
    padding: 48px 0;
    border-bottom: 1px solid var(--border);
}

.product-module:last-child {
    border-bottom: none;
}

.module-text h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.module-text p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.75;
    max-width: 640px;
}

.module-text ul {
    list-style: none;
    padding: 0;
}

.module-text ul li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 8px;
    font-size: 0.95rem;
    color: var(--text);
}

.module-text ul li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 10px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary);
}

/* --- Solution Page --- */
.solution-content {
    padding: 60px 0 80px;
}

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

.solution-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: box-shadow var(--transition), transform var(--transition);
}

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

.solution-card-header {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    padding: 16px 24px;
    font-size: 1.1rem;
    font-weight: 700;
}

.solution-card-body {
    padding: 24px;
}

.solution-card-body p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 16px;
}

.solution-card-body ul {
    list-style: none;
    padding: 0;
}

.solution-card-body ul li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 6px;
    font-size: 0.88rem;
    color: var(--text);
}

.solution-card-body ul li::before {
    content: "\2713";
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 700;
}

/* --- Case Page --- */
.case-content {
    padding: 60px 0 80px;
}

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

.case-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    transition: box-shadow var(--transition);
}

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

.case-tag {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 0.78rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 12px;
}

.case-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.case-highlight {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 10px;
}

.case-card p:last-child {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* --- About Page --- */
.about-content {
    padding: 60px 0 80px;
    flex: 1;
}

.about-intro,
.about-values,
.about-contact {
    margin-bottom: 56px;
}

.about-intro h2,
.about-values h2,
.about-contact h2 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.about-intro p {
    color: var(--text-secondary);
    max-width: 720px;
    line-height: 1.8;
    font-size: 1rem;
    margin-bottom: 12px;
}

.value-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 24px;
}

.value-item {
    background: var(--bg-alt);
    padding: 28px 20px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    text-align: center;
}

.value-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
    opacity: 0.25;
    margin-bottom: 8px;
}

.value-item h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.value-item p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.contact-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-top: 24px;
    max-width: 500px;
}

.contact-card {
    background: var(--bg-alt);
    padding: 28px 24px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    text-align: center;
}

.contact-icon {
    font-size: 1.8rem;
    margin-bottom: 10px;
}

.contact-card h3 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.contact-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* --- Policy Pages --- */
.policy-content {
    padding: 60px 0 80px;
    flex: 1;
}

.policy-article {
    max-width: 800px;
    margin: 0 auto;
}

.policy-article h2 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-top: 36px;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}

.policy-article h2:first-child {
    margin-top: 0;
}

.policy-article p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
    margin-bottom: 12px;
}

.policy-article ul,
.policy-article ol {
    margin: 12px 0 20px 20px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
}

.policy-article ul li,
.policy-article ol li {
    margin-bottom: 4px;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .hero-inner {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

    .hero-visual {
        grid-template-columns: 1fr 1fr;
    }

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

    .scenario-list {
        grid-template-columns: 1fr;
    }

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

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

    .nav {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--bg);
        border-bottom: 1px solid var(--border);
        padding: 16px 24px;
        gap: 12px;
        box-shadow: var(--shadow);
    }

    .nav.open {
        display: flex;
    }

    .menu-toggle {
        display: flex;
    }

    .contact-cards {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.6rem;
    }

    .hero-visual {
        grid-template-columns: 1fr;
    }

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

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

    .btn {
        width: 100%;
    }
}