/* ===== CSS Variables ===== */
:root {
    --color-primary: #1a3a5c;
    --color-primary-light: #2a5a8c;
    --color-accent: #e8833a;
    --color-accent-hover: #d4722a;
    --color-bg: #faf8f5;
    --color-bg-white: #ffffff;
    --color-text: #2c2c2c;
    --color-text-light: #666666;
    --color-border: #e0ddd8;
    --font-stack: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    --max-width: 1100px;
    --nav-height: 64px;
}

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

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

body {
    font-family: var(--font-stack);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

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

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-logo {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
    align-items: center;
}

.nav-link {
    color: var(--color-text);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--color-accent);
}

.nav-link-cta {
    background: var(--color-accent);
    color: #fff;
    padding: 8px 20px;
    border-radius: 6px;
    transition: background 0.2s;
}

.nav-link-cta:hover {
    background: var(--color-accent-hover);
    color: #fff;
}

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

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
}

/* ===== Main ===== */
main {
    margin-top: var(--nav-height);
    min-height: calc(100vh - var(--nav-height) - 200px);
}

/* ===== Hero Section ===== */
.hero {
    padding: 100px 0 60px;
    text-align: center;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 16px;
    line-height: 1.3;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto 36px;
    line-height: 1.8;
}

.hero-cta {
    display: inline-block;
    background: var(--color-accent);
    color: #fff;
    padding: 14px 36px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 1.05rem;
    font-weight: 600;
    transition: background 0.2s;
}

.hero-cta:hover {
    background: var(--color-accent-hover);
}

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

.section-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-primary);
    text-align: center;
    margin-bottom: 12px;
}

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

/* ===== Service Cards ===== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 36px 28px;
    transition: box-shadow 0.2s, transform 0.2s;
}

.service-card:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    transform: translateY(-2px);
}

.service-card-icon {
    width: 48px;
    height: 48px;
    background: var(--color-bg);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.service-card h3 {
    font-size: 1.15rem;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.service-card p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

.service-card .service-items {
    margin-top: 16px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.service-card .service-tag {
    font-size: 0.8rem;
    background: var(--color-bg);
    color: var(--color-text-light);
    padding: 4px 12px;
    border-radius: 20px;
}

/* ===== Case Cards ===== */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.case-card {
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    overflow: hidden;
    transition: box-shadow 0.2s;
}

.case-card:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.case-card-image {
    width: 100%;
    height: 200px;
    background: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-light);
    font-size: 0.9rem;
}

.case-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

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

.case-card-body h3 {
    font-size: 1.1rem;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.case-card-body p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    line-height: 1.6;
    margin-bottom: 12px;
}

.case-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.case-card-tag {
    font-size: 0.75rem;
    background: var(--color-bg);
    color: var(--color-text-light);
    padding: 3px 10px;
    border-radius: 12px;
}

/* ===== Case Filter ===== */
.case-filter {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 36px;
    flex-wrap: wrap;
}

.case-filter-btn {
    padding: 8px 20px;
    border: 1px solid var(--color-border);
    border-radius: 24px;
    background: var(--color-bg-white);
    color: var(--color-text);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.case-filter-btn:hover,
.case-filter-btn.active {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

/* ===== About ===== */
.about-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.about-text h2 {
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-bottom: 16px;
}

.about-text p {
    margin-bottom: 16px;
    line-height: 1.8;
}

.about-text .tech-stack {
    margin-top: 24px;
}

.about-text .tech-tag {
    display: inline-block;
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    padding: 6px 16px;
    border-radius: 20px;
    margin: 4px;
    font-size: 0.85rem;
}

/* ===== Contact ===== */
.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.contact-info h2 {
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-bottom: 24px;
}

.contact-method {
    margin-bottom: 24px;
}

.contact-method h3 {
    font-size: 1rem;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.contact-method p {
    color: var(--color-text-light);
}

.contact-qr {
    width: 160px;
    height: 160px;
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-light);
    font-size: 0.85rem;
    margin-top: 8px;
}

/* ===== Form ===== */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    color: var(--color-primary);
    margin-bottom: 6px;
    font-weight: 600;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: var(--font-stack);
    background: var(--color-bg-white);
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-error {
    color: #d32f2f;
    font-size: 0.8rem;
    margin-top: 4px;
}

.btn {
    display: inline-block;
    padding: 12px 32px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    text-decoration: none;
}

.btn-primary {
    background: var(--color-accent);
    color: #fff;
}

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

.btn-secondary {
    background: var(--color-primary);
    color: #fff;
}

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

.form-success {
    background: #e8f5e9;
    color: #2e7d32;
    padding: 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.9rem;
}

/* ===== Footer ===== */
.footer-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    padding: 48px 24px 24px;
    border-top: 1px solid var(--color-border);
    margin-top: 80px;
}

.footer-info {
    margin-bottom: 24px;
}

.footer-name {
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 4px;
}

.footer-info p {
    font-size: 0.85rem;
    color: var(--color-text-light);
}

.footer-links {
    display: flex;
    gap: 24px;
    margin-bottom: 24px;
}

.footer-links a {
    color: var(--color-text-light);
    text-decoration: none;
    font-size: 0.9rem;
}

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

.footer-bottom {
    width: 100%;
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
    font-size: 0.8rem;
    color: var(--color-text-light);
}

.footer-bottom a {
    color: var(--color-text-light);
    text-decoration: none;
}

/* ===== Admin ===== */
.admin-login-container {
    max-width: 400px;
    margin: 80px auto;
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 40px;
}

.admin-login-container h1 {
    text-align: center;
    color: var(--color-primary);
    margin-bottom: 32px;
    font-size: 1.3rem;
}

.login-error {
    background: #ffebee;
    color: #c62828;
    padding: 10px 16px;
    border-radius: 6px;
    margin-bottom: 20px;
    font-size: 0.85rem;
}

.admin-table {
    width: 100%;
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    overflow: hidden;
}

.admin-table th,
.admin-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.9rem;
}

.admin-table th {
    background: var(--color-bg);
    color: var(--color-primary);
    font-weight: 600;
}

.admin-actions {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
}

.admin-actions .btn {
    padding: 8px 20px;
    font-size: 0.9rem;
}

.btn-sm {
    padding: 4px 12px;
    font-size: 0.8rem;
    border-radius: 4px;
}

.btn-danger {
    background: #d32f2f;
    color: #fff;
}

/* ===== Breadcrumb ===== */
.breadcrumb {
    padding: 24px 0;
    font-size: 0.85rem;
    color: var(--color-text-light);
}

.breadcrumb a {
    color: var(--color-text-light);
    text-decoration: none;
}

.breadcrumb a:hover {
    color: var(--color-accent);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 16px 24px;
        border-bottom: 1px solid var(--color-border);
        gap: 0;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu li {
        padding: 12px 0;
        border-bottom: 1px solid var(--color-border);
    }

    .nav-menu li:last-child {
        border-bottom: none;
    }

    .nav-link-cta {
        display: inline-block;
    }

    .hero-title {
        font-size: 1.8rem;
    }

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

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

    .about-layout,
    .contact-layout {
        grid-template-columns: 1fr;
        gap: 36px;
    }

    .section {
        padding: 60px 0;
    }
}

/* ===== Utility ===== */
.text-center { text-align: center; }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }

/* ===== 后台侧边栏布局 ===== */
.admin-body { display: flex; min-height: 100vh; margin: 0; background: var(--color-bg-white); }
.admin-sidebar {
  width: 220px; min-height: 100vh; flex-shrink: 0; background: #1f2937; color: #e5e7eb;
  display: flex; flex-direction: column; position: sticky; top: 0;
}
.admin-sidebar-brand {
  padding: 20px 24px; font-size: 1.05rem; font-weight: 700; color: #fff;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.admin-sidebar-nav { flex: 1; padding: 12px 0; }
.admin-sidebar-link {
  display: block; padding: 12px 24px; color: #cbd5e1; text-decoration: none;
  font-size: 0.95rem; transition: background .15s ease;
}
.admin-sidebar-link:hover { background: rgba(255,255,255,0.06); color: #fff; }
.admin-sidebar-link.active { background: var(--color-primary); color: #fff; }
.admin-sidebar-footer { padding: 16px 24px; border-top: 1px solid rgba(255,255,255,0.08); }
.admin-sidebar-logout {
  width: 100%; padding: 10px 0; border: none; border-radius: 6px; cursor: pointer;
  background: rgba(255,255,255,0.08); color: #e5e7eb; font-size: 0.9rem;
}
.admin-sidebar-logout:hover { background: rgba(255,255,255,0.15); }
.admin-main { flex: 1; min-width: 0; padding: 40px 48px; margin-top: 0; }
.admin-page-title { color: var(--color-primary); margin-bottom: 24px; }

/* ===== 后台统计卡片 ===== */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 20px; margin-bottom: 36px; }
.stat-card {
  background: #fff; border: 1px solid var(--color-border); border-radius: 10px;
  padding: 20px 24px; box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.stat-label { display: block; color: var(--color-text-light); font-size: 0.85rem; margin-bottom: 8px; }
.stat-value { font-size: 2rem; font-weight: 700; color: var(--color-primary); }

/* ===== 后台面板与徽章 ===== */
.admin-panels { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 900px) { .admin-panels { grid-template-columns: 1fr; } }
.admin-panel { background: #fff; border: 1px solid var(--color-border); border-radius: 10px; padding: 20px 24px; }
.admin-panel-title { font-size: 1.05rem; color: var(--color-text); margin-bottom: 16px; }
.admin-empty { color: var(--color-text-light); padding: 20px 0; text-align: center; }
.badge { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: 0.8rem; }
.badge-unread { background: #fdecea; color: #c62828; }
.badge-read { background: #eef2f6; color: #64748b; }

/* ===== 后台联系我们列表 ===== */
.admin-toolbar { display: flex; gap: 12px; margin-bottom: 20px; align-items: center; flex-wrap: wrap; }
.admin-search-input {
  padding: 10px 12px; border: 1px solid var(--color-border); border-radius: 8px;
  font-size: 0.9rem; min-width: 240px; font-family: var(--font-stack);
}
.admin-search-select {
  padding: 10px 12px; border: 1px solid var(--color-border); border-radius: 8px;
  font-size: 0.9rem; font-family: var(--font-stack);
}
.admin-table tr.row-unread td { background: #fff8e6; }
.admin-pagination { display: flex; align-items: center; gap: 16px; margin-top: 24px; }
.admin-pagination-info { color: var(--color-text-light); font-size: 0.9rem; }

/* ===== 后台联系我们详情 ===== */
.admin-detail-list { margin: 0; }
.admin-detail-list dt { color: var(--color-text-light); font-size: 0.85rem; margin-top: 16px; }
.admin-detail-list dt:first-child { margin-top: 0; }
.admin-detail-list dd { margin: 4px 0 0; color: var(--color-text); font-size: 0.95rem; }

/* 蜜罐字段：移出可视区域，保持可聚焦以欺骗爬虫 */
.hp-field {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}