/* 庆云煤业 企业官网 - 主样式 */

:root {
    --primary: #0f2a44;
    --primary-light: #1b3f63;
    --accent: #e8842c;
    --accent-dark: #c96d1c;
    --text: #1f2937;
    --text-light: #6b7280;
    --bg: #ffffff;
    --bg-soft: #f5f7fa;
    --border: #e5e7eb;
    --shadow: 0 2px 12px rgba(15, 42, 68, 0.08);
    --radius: 8px;
    --max-width: 1200px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

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

img {
    max-width: 100%;
    display: block;
}

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

/* ---------- 顶部导航 ---------- */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
}

.logo-mark {
    width: 36px;
    height: 36px;
    background: var(--accent);
    border-radius: var(--radius);
    display: grid;
    place-items: center;
    color: #fff;
    font-size: 18px;
    font-weight: 700;
}

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

.nav a {
    font-size: 15px;
    color: var(--text-light);
    transition: color 0.2s;
    padding: 4px 0;
    border-bottom: 2px solid transparent;
}

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

.nav a.active {
    color: var(--primary);
    font-weight: 600;
    border-bottom-color: var(--accent);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--primary);
}

/* ---------- Hero ---------- */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: #fff;
    padding: 96px 0;
}

.hero h1 {
    font-size: 44px;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 20px;
}

.hero p {
    font-size: 18px;
    opacity: 0.85;
    max-width: 640px;
    margin-bottom: 32px;
}

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

.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: var(--radius);
    font-size: 15px;
    font-weight: 600;
    transition: all 0.2s;
}

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

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

.btn-outline {
    border: 1px solid rgba(255, 255, 255, 0.4);
    color: #fff;
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* ---------- 通用区块 ---------- */
.section {
    padding: 80px 0;
}

.section-soft {
    background: var(--bg-soft);
}

.section-title {
    text-align: center;
    margin-bottom: 48px;
}

.section-title h2 {
    font-size: 32px;
    color: var(--primary);
    margin-bottom: 12px;
}

.section-title p {
    color: var(--text-light);
    font-size: 16px;
}

/* ---------- 卡片网格 ---------- */
.grid {
    display: grid;
    gap: 28px;
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

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

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

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(15, 42, 68, 0.12);
}

.card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    background: rgba(232, 132, 44, 0.12);
    color: var(--accent);
    display: grid;
    place-items: center;
    font-size: 22px;
    margin-bottom: 18px;
}

.card h3 {
    font-size: 18px;
    color: var(--primary);
    margin-bottom: 10px;
}

.card p {
    color: var(--text-light);
    font-size: 15px;
}

/* ---------- 新闻列表 ---------- */
.news-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.news-item {
    display: flex;
    gap: 32px;
    padding: 28px 0;
    border-bottom: 1px solid var(--border);
    transition: background 0.2s;
}

.news-item:hover {
    background: var(--bg-soft);
}

.news-date {
    flex-shrink: 0;
    width: 110px;
    color: var(--accent);
    font-weight: 600;
    font-size: 15px;
}

.news-content h3 {
    font-size: 18px;
    color: var(--primary);
    margin-bottom: 8px;
}

.news-content p {
    color: var(--text-light);
    font-size: 15px;
}

/* ---------- 页脚 ---------- */
.footer {
    background: var(--primary);
    color: rgba(255, 255, 255, 0.75);
    padding: 56px 0 28px;
    font-size: 14px;
}

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

.footer h4 {
    color: #fff;
    font-size: 16px;
    margin-bottom: 16px;
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    padding-top: 24px;
    text-align: center;
    font-size: 13px;
}

/* ---------- 内页标题 ---------- */
.page-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: #fff;
    padding: 64px 0;
}

.page-header h1 {
    font-size: 34px;
    margin-bottom: 10px;
}

.page-header p {
    opacity: 0.85;
}

/* ---------- 发展历程时间线 ---------- */
.timeline {
    max-width: 760px;
    margin: 0 auto;
    border-left: 2px solid var(--border);
    padding-left: 32px;
}

.timeline-item {
    position: relative;
    padding-bottom: 32px;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -41px;
    top: 6px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--bg-soft);
}

.timeline-year {
    color: var(--accent);
    font-weight: 700;
    font-size: 17px;
    margin-bottom: 4px;
}

.timeline-text {
    color: var(--text-light);
    font-size: 15px;
}

/* ---------- 表单 ---------- */
.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 6px;
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 15px;
    font-family: inherit;
    transition: border-color 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent);
}

textarea.form-control {
    resize: vertical;
}

/* ---------- 产品卡片 ---------- */
.product-card {
    display: flex;
    flex-direction: column;
    padding: 0;
    overflow: hidden;
}

.product-thumb {
    width: 100%;
    aspect-ratio: 4 / 3;
    background: var(--bg-soft);
    overflow: hidden;
}

.product-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.product-card:hover .product-thumb img {
    transform: scale(1.05);
}

.product-card h3 {
    padding: 20px 24px 0;
    margin-bottom: 6px;
}

.product-card p {
    padding: 0 24px 24px;
}

/* ---------- 富文本正文 ---------- */
.product-detail {
    line-height: 1.9;
    font-size: 15px;
}

.product-detail img {
    max-width: 100%;
    height: auto;
    margin: 14px 0;
    border-radius: 4px;
}

.product-detail p {
    margin-bottom: 14px;
}

.product-detail h1,
.product-detail h2,
.product-detail h3,
.product-detail h4 {
    color: var(--primary);
    margin: 22px 0 10px;
}

.product-detail ul,
.product-detail ol {
    margin: 0 0 14px 24px;
}

.product-detail table {
    width: 100%;
    border-collapse: collapse;
    margin: 14px 0;
}

.product-detail table th,
.product-detail table td {
    border: 1px solid var(--border);
    padding: 8px 10px;
}

.product-detail a {
    color: var(--accent);
    text-decoration: underline;
}

/* ---------- 分页 ---------- */
.pagebar {
    margin-top: 36px;
    text-align: center;
}

.pagebar a,
.pagebar span {
    display: inline-block;
    margin: 0 4px;
    padding: 8px 14px;
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-light);
    font-size: 14px;
}

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

.pagebar .active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

/* ---------- 上下篇 ---------- */
.news-nav {
    margin-top: 28px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    font-size: 15px;
    color: var(--text-light);
}

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

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
    .grid-3,
    .grid-2,
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .hero {
        padding: 64px 0;
    }

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

    .section {
        padding: 56px 0;
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .nav {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        background: var(--bg);
        border-bottom: 1px solid var(--border);
        padding: 8px 24px 16px;
    }

    .nav.open {
        display: flex;
    }

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

    .news-item {
        flex-direction: column;
        gap: 8px;
    }
}