/* =====================================================
   天津兆泰钢铁有限公司 - 首页全新设计
   直角方矩管 / 精致钢 / Q355B方矩管现货
   ===================================================== */
:root {
    --primary: #0f2a43;
    --primary-dark: #0a1e31;
    --primary-light: #1c4468;
    --accent: #f07316;
    --accent-dark: #d4600e;
    --steel-gray: #5b6b7c;
    --text: #2b3440;
    --text-light: #66788a;
    --bg: #f4f6f9;
    --white: #ffffff;
    --border: #e3e9f0;
    --shadow: 0 4px 20px rgba(15, 42, 67, 0.08);
    --shadow-lg: 0 12px 40px rgba(15, 42, 67, 0.15);
    --radius: 10px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

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

ul {
    list-style: none;
}

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

/* ---------- 顶部信息条 ---------- */
.topbar {
    background: var(--primary-dark);
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.85rem;
    padding: 8px 0;
}

.topbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.topbar-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-right: 22px;
}

.topbar-item i {
    color: var(--accent);
}

.topbar-phone {
    font-weight: 700;
    color: #fff;
    font-size: 0.95rem;
    letter-spacing: 0.5px;
}

/* ---------- 主导航 ---------- */
.main-header {
    background: var(--white);
    box-shadow: 0 2px 12px rgba(15, 42, 67, 0.08);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.main-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 76px;
    gap: 20px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.brand-logo {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    font-size: 1.4rem;
}

.brand-text strong {
    display: block;
    font-size: 1.25rem;
    color: var(--primary);
    line-height: 1.25;
    letter-spacing: 1px;
}

.brand-text span {
    display: block;
    font-size: 0.72rem;
    color: var(--text-light);
    letter-spacing: 0.5px;
}

.main-nav ul {
    display: flex;
    gap: 4px;
}

.main-nav a {
    display: block;
    padding: 10px 16px;
    color: var(--text);
    font-weight: 600;
    font-size: 0.98rem;
    border-radius: 6px;
    transition: all 0.25s;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--accent);
    background: rgba(240, 115, 22, 0.08);
}

.header-cta {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-shrink: 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 26px;
    border-radius: 6px;
    font-weight: 700;
    font-size: 0.98rem;
    transition: all 0.25s;
    border: 2px solid transparent;
    cursor: pointer;
    white-space: nowrap;
}

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

.btn-accent:hover {
    background: var(--accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(240, 115, 22, 0.35);
}

.btn-outline-light {
    border-color: rgba(255, 255, 255, 0.6);
    color: #fff;
}

.btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: #fff;
}

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

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

.btn-lg {
    padding: 15px 36px;
    font-size: 1.08rem;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--primary);
    cursor: pointer;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
    background: var(--white);
    border-bottom: 1px solid var(--border);
    padding: 10px 0;
    font-size: 0.85rem;
    color: var(--text-light);
}

.breadcrumb ol {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
}

.breadcrumb a {
    color: var(--primary-light);
}

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

.breadcrumb li[aria-current] {
    color: var(--text-light);
}

/* ---------- Hero 区域 ---------- */
.hero {
    background:
        linear-gradient(115deg, rgba(10, 30, 49, 0.96) 0%, rgba(15, 42, 67, 0.88) 45%, rgba(28, 68, 104, 0.75) 100%),
        repeating-linear-gradient(45deg, #122c46 0 14px, #0f2a43 14px 28px);
    color: #fff;
    padding: 88px 0 96px;
    position: relative;
    overflow: hidden;
}

.hero::after {
    content: "";
    position: absolute;
    right: -120px;
    top: -120px;
    width: 420px;
    height: 420px;
    border: 60px solid rgba(240, 115, 22, 0.12);
    border-radius: 40px;
    transform: rotate(25deg);
}

.hero .container {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 50px;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(240, 115, 22, 0.16);
    border: 1px solid rgba(240, 115, 22, 0.45);
    color: #ffb37a;
    padding: 6px 16px;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 22px;
}

.hero h1 {
    font-size: 2.55rem;
    line-height: 1.3;
    font-weight: 800;
    margin-bottom: 18px;
    letter-spacing: 1px;
}

.hero h1 .highlight {
    color: var(--accent);
}

.hero-sub {
    font-size: 1.12rem;
    color: rgba(255, 255, 255, 0.82);
    margin-bottom: 34px;
    max-width: 640px;
}

.hero-sub strong {
    color: #ffd8b8;
}

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

.hero-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
}

.stat-card {
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: var(--radius);
    padding: 20px 18px;
    backdrop-filter: blur(4px);
}

.stat-card .num {
    font-size: 1.9rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1.2;
}

.stat-card .num small {
    font-size: 1rem;
    font-weight: 600;
}

.stat-card .label {
    font-size: 0.88rem;
    color: rgba(255, 255, 255, 0.75);
    margin-top: 4px;
}

/* ---------- 通用区块 ---------- */
.section {
    padding: 76px 0;
}

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

.section-dark {
    background: linear-gradient(160deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #fff;
}

.section-head {
    text-align: center;
    max-width: 760px;
    margin: 0 auto 52px;
}

.section-tag {
    display: inline-block;
    color: var(--accent);
    font-weight: 700;
    font-size: 0.9rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 10px;
}

.section-head h2 {
    font-size: 2.05rem;
    color: var(--primary);
    font-weight: 800;
    margin-bottom: 14px;
    position: relative;
    padding-bottom: 16px;
}

.section-head h2::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 0;
    transform: translateX(-50%);
    width: 64px;
    height: 4px;
    background: var(--accent);
    border-radius: 2px;
}

.section-dark .section-head h2 {
    color: #fff;
}

.section-head p {
    color: var(--text-light);
    font-size: 1.02rem;
}

.section-dark .section-head p {
    color: rgba(255, 255, 255, 0.75);
}

/* ---------- 核心产品 ---------- */
.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 26px;
}

.product-card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: transform 0.3s, box-shadow 0.3s;
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.product-visual {
    height: 170px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    overflow: hidden;
}

.product-visual.p1 { background: linear-gradient(135deg, #16324f, #2a5878); }
.product-visual.p2 { background: linear-gradient(135deg, #7a4a12, #b06a1a); }
.product-visual.p3 { background: linear-gradient(135deg, #234a35, #3a7a56); }

.product-visual i {
    font-size: 4.2rem;
    opacity: 0.9;
}

.product-visual .shape {
    position: absolute;
    right: -34px;
    bottom: -34px;
    width: 140px;
    height: 140px;
    border: 26px solid rgba(255, 255, 255, 0.12);
    border-radius: 14px;
}

.product-tag {
    position: absolute;
    left: 14px;
    top: 14px;
    background: var(--accent);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 999px;
    letter-spacing: 1px;
}

.product-body {
    padding: 26px 24px 28px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.product-body h3 {
    font-size: 1.32rem;
    color: var(--primary);
    margin-bottom: 10px;
    font-weight: 700;
}

.product-body > p {
    color: var(--text-light);
    font-size: 0.94rem;
    margin-bottom: 16px;
    flex: 1;
}

.spec-list {
    border-top: 1px dashed var(--border);
    padding-top: 14px;
    margin-bottom: 18px;
}

.spec-list li {
    display: flex;
    justify-content: space-between;
    font-size: 0.88rem;
    padding: 5px 0;
    color: var(--steel-gray);
}

.spec-list li b {
    color: var(--text);
    font-weight: 600;
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--accent);
    font-weight: 700;
    font-size: 0.95rem;
}

.card-link:hover {
    gap: 12px;
    color: var(--accent-dark);
}

.card-link i {
    transition: transform 0.25s;
}

/* ---------- 现货库存表 ---------- */
.stock-wrap {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    overflow: hidden;
}

.stock-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    padding: 20px 26px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    color: #fff;
}

.stock-toolbar h3 {
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.stock-toolbar h3 i {
    color: var(--accent);
}

.stock-note {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.75);
}

.table-scroll {
    overflow-x: auto;
}

.stock-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.92rem;
    min-width: 760px;
}

.stock-table caption {
    text-align: left;
    padding: 14px 26px 0;
    color: var(--text-light);
    font-size: 0.85rem;
    caption-side: top;
}

.stock-table th,
.stock-table td {
    padding: 13px 16px;
    text-align: center;
    border-bottom: 1px solid var(--border);
}

.stock-table thead th {
    background: #eef3f8;
    color: var(--primary);
    font-weight: 700;
    white-space: nowrap;
}

.stock-table tbody tr:nth-child(even) {
    background: #f8fafc;
}

.stock-table tbody tr:hover {
    background: rgba(240, 115, 22, 0.06);
}

.badge-stock {
    display: inline-block;
    background: #e8f7ee;
    color: #1c8a4d;
    font-size: 0.78rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 999px;
}

.stock-footer {
    padding: 18px 26px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 14px;
    background: #f8fafc;
}

.stock-footer p {
    color: var(--text-light);
    font-size: 0.9rem;
}

.stock-footer p i {
    color: var(--accent);
    margin-right: 6px;
}

/* ---------- 厂家实力 ---------- */
.factory-grid {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 54px;
    align-items: center;
}

.factory-content h3 {
    font-size: 1.75rem;
    color: var(--primary);
    margin-bottom: 18px;
    font-weight: 800;
    line-height: 1.4;
}

.factory-content h3 em {
    color: var(--accent);
    font-style: normal;
}

.factory-content p {
    color: var(--text-light);
    margin-bottom: 16px;
    font-size: 0.98rem;
}

.factory-points {
    margin: 24px 0 30px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.factory-points li {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    font-size: 0.94rem;
    font-weight: 600;
    color: var(--text);
}

.factory-points li i {
    color: var(--accent);
    margin-top: 4px;
}

.factory-visual {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}

.factory-box {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 30px 22px;
    text-align: center;
    transition: transform 0.3s;
}

.factory-box:hover {
    transform: translateY(-6px);
}

.factory-box i {
    font-size: 2.4rem;
    color: var(--accent);
    margin-bottom: 14px;
}

.factory-box .num {
    font-size: 1.7rem;
    font-weight: 800;
    color: var(--primary);
}

.factory-box .txt {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-top: 4px;
}

/* ---------- 知识/百科 ---------- */
.knowledge-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 26px;
}

.knowledge-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 30px;
    box-shadow: var(--shadow);
}

.knowledge-card h3 {
    color: var(--primary);
    font-size: 1.28rem;
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.knowledge-card h3 i {
    color: var(--accent);
}

.knowledge-card p {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 12px;
}

.knowledge-card p strong {
    color: var(--text);
}

/* ---------- 优势 ---------- */
.adv-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.adv-item {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius);
    padding: 34px 24px;
    text-align: center;
    transition: all 0.3s;
}

.adv-item:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-6px);
    border-color: rgba(240, 115, 22, 0.5);
}

.adv-item i {
    font-size: 2.5rem;
    color: var(--accent);
    margin-bottom: 16px;
}

.adv-item h3 {
    font-size: 1.15rem;
    margin-bottom: 10px;
}

.adv-item p {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.72);
}

/* ---------- FAQ ---------- */
.faq-list {
    max-width: 860px;
    margin: 0 auto;
}

.faq-item {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 14px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.faq-item summary {
    list-style: none;
    cursor: pointer;
    padding: 20px 26px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 14px;
    font-weight: 700;
    color: var(--primary);
    font-size: 1.02rem;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary .faq-icon {
    flex-shrink: 0;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: rgba(240, 115, 22, 0.12);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.25s;
    font-size: 0.85rem;
}

.faq-item[open] summary .faq-icon {
    transform: rotate(45deg);
}

.faq-item .faq-answer {
    padding: 0 26px 22px;
    color: var(--text-light);
    font-size: 0.95rem;
    border-top: 1px dashed var(--border);
    padding-top: 16px;
}

/* ---------- 联系 CTA ---------- */
.cta-section {
    background:
        linear-gradient(100deg, rgba(10, 30, 49, 0.97), rgba(28, 68, 104, 0.92)),
        repeating-linear-gradient(-45deg, #122c46 0 12px, #0f2a43 12px 24px);
    color: #fff;
    padding: 72px 0;
    text-align: center;
}

.cta-section h2 {
    font-size: 2rem;
    margin-bottom: 12px;
    font-weight: 800;
}

.cta-section > .container > p {
    color: rgba(255, 255, 255, 0.78);
    margin-bottom: 30px;
}

.cta-phone {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    font-size: 2.3rem;
    font-weight: 800;
    color: var(--accent);
    margin-bottom: 26px;
    letter-spacing: 1px;
}

.cta-phone:hover {
    color: #ff9a4d;
}

.cta-info {
    display: flex;
    justify-content: center;
    gap: 36px;
    flex-wrap: wrap;
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.95rem;
}

.cta-info i {
    color: var(--accent);
    margin-right: 8px;
}

/* ---------- 页脚 ---------- */
.footer {
    background: var(--primary-dark);
    color: rgba(255, 255, 255, 0.72);
    padding: 56px 0 0;
    font-size: 0.92rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
    gap: 40px;
    padding-bottom: 40px;
}

.footer h4 {
    color: #fff;
    font-size: 1.05rem;
    margin-bottom: 18px;
    font-weight: 700;
}

.footer-about strong {
    display: block;
    color: var(--accent);
    font-size: 1.15rem;
    margin-bottom: 10px;
}

.footer-links li {
    margin-bottom: 10px;
}

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

.footer-contact li {
    display: flex;
    gap: 10px;
    margin-bottom: 12px;
    align-items: flex-start;
}

.footer-contact i {
    color: var(--accent);
    margin-top: 5px;
}

.footer-keywords {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 18px 0;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.45);
    line-height: 1.9;
}

.footer-keywords a {
    color: rgba(255, 255, 255, 0.55);
}

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

.copyright {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 18px 0;
    text-align: center;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.45);
}

/* ---------- 浮动电话 ---------- */
.float-call {
    position: fixed;
    right: 22px;
    bottom: 26px;
    z-index: 999;
    width: 58px;
    height: 58px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    box-shadow: 0 8px 24px rgba(240, 115, 22, 0.45);
    animation: pulse 2s infinite;
}

.float-call:hover {
    background: var(--accent-dark);
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(240, 115, 22, 0.45); }
    70% { box-shadow: 0 0 0 16px rgba(240, 115, 22, 0); }
    100% { box-shadow: 0 0 0 0 rgba(240, 115, 22, 0); }
}

/* ---------- 响应式 ---------- */
@media (max-width: 992px) {
    .hero .container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

    .factory-grid,
    .knowledge-grid {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 768px) {
    .topbar .contact-addr {
        display: none;
    }

    .menu-toggle {
        display: block;
    }

    .main-nav {
        position: absolute;
        top: 76px;
        left: 0;
        right: 0;
        background: var(--white);
        box-shadow: 0 12px 24px rgba(15, 42, 67, 0.15);
        display: none;
    }

    .main-nav.open {
        display: block;
    }

    .main-nav ul {
        flex-direction: column;
        padding: 12px;
        gap: 2px;
    }

    .main-nav a {
        padding: 13px 16px;
    }

    .header-cta .btn span {
        display: none;
    }

    .header-cta .btn {
        padding: 10px 14px;
    }

    .hero {
        padding: 56px 0 64px;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .section {
        padding: 52px 0;
    }

    .section-head h2 {
        font-size: 1.55rem;
    }

    .product-grid,
    .adv-grid,
    .factory-points,
    .footer-grid {
        grid-template-columns: 1fr;
    }

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

    .cta-phone {
        font-size: 1.6rem;
    }

    .cta-section h2 {
        font-size: 1.5rem;
    }
}