/*
 * 成都无极链科技有限公司官网 - 主样式表（重构版）
 * 设计策略：「基础设施型」科技官网
 * 关键词：稳定 / 安全 / 高效 / 可靠
 */

/* =========================
   1) Design Tokens
========================= */
:root {
    /* 方案指定色 */
    --color-primary: #0C4A6E;   /* 机房蓝 */
    --color-secondary: #334155; /* 服务器灰 */
    --color-accent: #22C55E;    /* 网络绿 */
    --color-warning: #EAB308;   /* 警示黄 */

    /* 中性色与语义色 */
    --color-bg: #F8FAFC;        /* slate-50 */
    --color-surface: #FFFFFF;
    --color-surface-2: #F1F5F9; /* slate-100 */
    --color-text: #0F172A;      /* slate-900 */
    --color-text-muted: #475569;/* slate-600 */
    --color-text-inverse: #F8FAFC;
    --color-border: #E2E8F0;    /* slate-200 */

    --radius-sm: 6px;
    --radius-md: 10px;

    --shadow-sm: 0 6px 18px rgba(2, 6, 23, 0.08);
    --shadow-md: 0 10px 30px rgba(2, 6, 23, 0.12);

    --container: 1200px;
    --header-height: 72px;

    /* 字体：阿里巴巴普惠体（若系统未安装则自动降级） */
    --font-sans: "Alibaba PuHuiTi", "Alibaba PuHuiTi 2.0", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

    /* 间距 */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 24px;
    --space-6: 36px;
    --space-7: 56px;
    --space-8: 80px;

    /* 网格 */
    --grid-columns: 12;
    --grid-gap: var(--space-5);
}

/* =========================
   2) Base & Reset
========================= */
*,
*::before,
*::after {
    box-sizing: border-box;
}

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

body {
    margin: 0;
    font-family: var(--font-sans);
    line-height: 1.65;
    color: var(--color-text);
    background: var(--color-bg);
}

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

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

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

button,
input,
textarea,
select {
    font: inherit;
}

/* a11y */
.skip-link {
    position: absolute;
    left: -999px;
    top: var(--space-3);
    z-index: 2000;
    background: var(--color-warning);
    color: #111827;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-sm);
}
.skip-link:focus {
    left: var(--space-3);
}

/* =========================
   3) Layout
========================= */
.container {
    width: min(92vw, var(--container));
    margin: 0 auto;
}

.grid {
    display: grid;
    grid-template-columns: repeat(var(--grid-columns), minmax(0, 1fr));
    gap: var(--grid-gap);
}

.col-1 { grid-column: span 1; }
.col-2 { grid-column: span 2; }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-10 { grid-column: span 10; }
.col-11 { grid-column: span 11; }
.col-12 { grid-column: span 12; }

@media (max-width: 1024px) {
    .grid {
        gap: var(--space-4);
    }
    .col-3, .col-4, .col-5, .col-6 { grid-column: span 12; }
    .col-7, .col-8, .col-9, .col-10, .col-11 { grid-column: span 12; }
}

@media (max-width: 640px) {
    .container {
        width: min(94vw, var(--container));
    }
    .grid {
        grid-template-columns: 1fr;
    }
    .col-1, .col-2, .col-3, .col-4, .col-5, .col-6,
    .col-7, .col-8, .col-9, .col-10, .col-11, .col-12 {
        grid-column: span 1;
    }
}

/* =========================
   4) Typography
========================= */
.heading-primary {
    font-size: clamp(1.9rem, 3.2vw, 3rem);
    letter-spacing: 0.02em;
    margin: 0 0 var(--space-4);
    font-weight: 760;
}

.heading-secondary {
    font-size: clamp(1.35rem, 2.1vw, 1.8rem);
    margin: 0 0 var(--space-3);
    font-weight: 720;
}

.heading-tertiary {
    font-size: 1.1rem;
    margin: 0 0 var(--space-2);
    font-weight: 700;
}

.section-subtitle {
    margin: 0;
    color: var(--color-text-muted);
}

/* =========================
   5) Utilities
========================= */
.text-center { text-align: center; }
.mt-large { margin-top: var(--space-6); }
.mb-large { margin-bottom: var(--space-6); }
.section-padding { padding: var(--space-8) 0; }
.bg-dark { background: #0B1220; color: var(--color-text-inverse); }
.bg-muted { background: var(--color-surface-2); }

/* =========================
   6) Buttons / Cards
========================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    user-select: none;
    font-weight: 700;
    transition: background-color .2s ease, border-color .2s ease, color .2s ease, transform .2s ease, box-shadow .2s ease;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-text-inverse);
}
.btn-primary:hover {
    background: #0B3E5C;
    border-color: #0B3E5C;
    box-shadow: var(--shadow-sm);
}

.btn-secondary {
    background: transparent;
    border-color: rgba(148, 163, 184, 0.55);
    color: var(--color-text-inverse);
}
.btn-secondary:hover {
    border-color: rgba(226, 232, 240, 0.75);
    box-shadow: var(--shadow-sm);
}

.btn-accent {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: #052E14;
}
.btn-accent:hover {
    background: #16A34A;
    border-color: #16A34A;
    box-shadow: var(--shadow-sm);
}

.btn-ghost {
    background: transparent;
    border-color: var(--color-border);
    color: var(--color-text);
}
.btn-ghost:hover {
    border-color: rgba(12, 74, 110, 0.35);
    box-shadow: var(--shadow-sm);
}

.btn-sm { padding: 8px 12px; font-size: 0.92rem; }
.btn-lg { padding: 12px 18px; font-size: 1.02rem; }

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: var(--space-5);
}

.card--flat {
    box-shadow: none;
}

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

/* =========================
   7) Header / Navigation
========================= */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1500;
    backdrop-filter: saturate(120%);
}

.topbar {
    background: var(--color-secondary);
    color: var(--color-text-inverse);
    border-bottom: 1px solid rgba(148, 163, 184, 0.28);
}
.topbar__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 0;
    gap: var(--space-3);
}
.topbar__badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 0.92rem;
    color: rgba(248, 250, 252, 0.92);
}
.topbar__right {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex-wrap: wrap;
    justify-content: flex-end;
}
.topbar__link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.92rem;
    color: rgba(248, 250, 252, 0.92);
}
.topbar__link:hover { color: #FFFFFF; }

.nav {
    background: rgba(255, 255, 255, 0.92);
    border-bottom: 1px solid rgba(226, 232, 240, 0.9);
}
.nav__inner {
    height: var(--header-height);
    display: grid;
    grid-template-columns: 1fr auto auto;
    align-items: center;
    gap: var(--space-4);
}

.brand {
    display: flex;
    align-items: baseline;
    gap: var(--space-3);
    min-width: 0;
}
.brand__name {
    font-weight: 800;
    letter-spacing: 0.04em;
    color: var(--color-primary);
    font-size: 1.15rem;
    white-space: nowrap;
}
.brand__desc {
    font-size: 0.92rem;
    color: var(--color-text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.nav__toggle {
    display: none;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    cursor: pointer;
}

.nav__menu {
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav__link,
.nav__button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-weight: 700;
    border: 1px solid transparent;
    background: transparent;
}
.nav__link:hover,
.nav__button:hover {
    color: var(--color-primary);
    border-color: rgba(12, 74, 110, 0.18);
    background: rgba(12, 74, 110, 0.06);
}

.nav__item {
    position: relative;
}

.nav__dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    min-width: 220px;
    padding: 10px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.nav__dropdown a {
    display: block;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    font-weight: 650;
    color: var(--color-text);
}
.nav__dropdown a:hover {
    background: rgba(51, 65, 85, 0.08);
    color: var(--color-primary);
}

.nav__item:hover .nav__dropdown {
    display: block;
}

.nav__cta {
    display: flex;
    justify-content: flex-end;
}

.site-header.is-scrolled .nav {
    box-shadow: 0 8px 20px rgba(15, 23, 42, 0.12);
}

@media (max-width: 1024px) {
    .nav__inner {
        grid-template-columns: 1fr auto;
        height: auto;
        padding: 12px 0;
    }
    .brand__desc { display: none; }
    .nav__toggle { display: inline-flex; align-items: center; justify-content: center; }
    .nav__menu {
        display: none;
        grid-column: 1 / -1;
        width: 100%;
        padding: 10px 0 16px;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
    }
    .nav__menu.is-open { display: flex; }
    .nav__cta { grid-column: 1 / -1; justify-content: stretch; }
    .nav__cta .btn { width: 100%; }

    .nav__item:hover .nav__dropdown { display: none; }
    .nav__item.is-open .nav__dropdown { display: block; position: static; box-shadow: none; margin-top: 6px; }
}

/* =========================
   8) Hero / Page Header
========================= */
.hero {
    position: relative;
    color: var(--color-text-inverse);
    background: #0B1220;
    overflow: hidden;
}
.hero--image {
    background-size: cover;
    background-position: center;
}
.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background: rgba(2, 6, 23, 0.62);
}
.hero__inner {
    position: relative;
    padding: clamp(64px, 10vw, 120px) 0;
}
.hero__kicker {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95rem;
    color: rgba(248, 250, 252, 0.92);
}
.hero__actions {
    display: flex;
    gap: var(--space-3);
    margin-top: var(--space-5);
    flex-wrap: wrap;
}

.page-hero {
    position: relative;
    background: #0B1220;
    color: var(--color-text-inverse);
}
.page-hero--image {
    background-size: cover;
    background-position: center;
}
.page-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background: rgba(2, 6, 23, 0.64);
}
.page-hero__inner {
    position: relative;
    padding: 56px 0;
}
.breadcrumb {
    margin-top: var(--space-3);
    color: rgba(248, 250, 252, 0.82);
    font-size: 0.95rem;
}
.breadcrumb a { color: rgba(248, 250, 252, 0.92); }
.breadcrumb a:hover { color: #FFFFFF; }

/* =========================
   9) Footer
========================= */
.site-footer {
    background: #0B1220;
    color: rgba(248, 250, 252, 0.92);
    border-top: 1px solid rgba(148, 163, 184, 0.2);
}
.footer__inner {
    padding: var(--space-7) 0 var(--space-6);
}
.footer__grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1.1fr;
    gap: var(--space-5);
}
.footer__title {
    font-weight: 800;
    letter-spacing: 0.03em;
    margin: 0 0 var(--space-3);
    color: #FFFFFF;
}
.footer__text {
    margin: 0 0 var(--space-4);
    color: rgba(248, 250, 252, 0.78);
}
.footer__links {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 8px;
}
.footer__links a {
    color: rgba(248, 250, 252, 0.82);
}
.footer__links a:hover {
    color: #FFFFFF;
}
.footer__meta {
    margin-top: var(--space-6);
    padding: 18px 0;
    border-top: 1px solid rgba(148, 163, 184, 0.18);
    color: rgba(248, 250, 252, 0.72);
    font-size: 0.92rem;
}
.footer__badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(148, 163, 184, 0.18);
    background: rgba(15, 23, 42, 0.45);
}
.qr {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-sm);
    background: #FFFFFF;
    display: grid;
    place-items: center;
    padding: 8px;
}
.qr svg { width: 100%; height: 100%; }

@media (max-width: 1024px) {
    .footer__grid {
        grid-template-columns: 1fr 1fr;
    }
}
@media (max-width: 640px) {
    .footer__grid {
        grid-template-columns: 1fr;
    }
}

/* =========================
   10) Content Blocks
========================= */
.section-head {
    margin-bottom: var(--space-5);
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: var(--space-4);
    flex-wrap: wrap;
}
.section-head__kicker {
    font-size: 0.95rem;
    letter-spacing: 0.08em;
    font-weight: 760;
    color: var(--color-primary);
    text-transform: uppercase;
}
.section-head__title {
    margin: 0;
}
.section-head__desc {
    margin: 0;
    color: var(--color-text-muted);
}

.pill-nav {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}
.pill {
    padding: 10px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-surface);
    color: var(--color-text);
    font-weight: 700;
    cursor: pointer;
    transition: all .2s ease;
}
.pill:hover {
    border-color: rgba(12, 74, 110, 0.35);
    color: var(--color-primary);
}
.pill.is-active {
    border-color: var(--color-primary);
    background: rgba(12, 74, 110, 0.08);
    color: var(--color-primary);
}

.matrix {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-4);
}
.matrix__card {
    border-left: 4px solid var(--color-primary);
    padding: var(--space-4);
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}
.matrix__title {
    margin: 0 0 var(--space-2);
    font-size: 1.1rem;
    font-weight: 760;
}
.matrix__items {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 8px;
    color: var(--color-text-muted);
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    gap: var(--space-4);
}
.stat-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    box-shadow: var(--shadow-sm);
}
.stat-card__value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-primary);
    margin: 0 0 var(--space-2);
}
.stat-card__label {
    color: var(--color-text-muted);
    margin: 0;
}

.list-check {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 12px;
}
.list-check li {
    display: grid;
    grid-template-columns: 18px 1fr;
    align-items: start;
    gap: 10px;
    color: var(--color-text);
}
.list-check__dot {
    display: inline-block;
    width: 14px;
    height: 14px;
    border-radius: 3px;
    background: var(--color-primary);
    margin-top: 4px;
}

.side-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: var(--space-3);
    position: sticky;
    top: calc(var(--header-height) + 20px);
}
.side-card__title {
    margin: 0 0 var(--space-3);
    font-weight: 760;
    color: var(--color-primary);
}
.side-card__nav {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 8px;
}
.side-card__nav a {
    display: block;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
}
.side-card__nav a:hover,
.side-card__nav a.is-active {
    border-color: rgba(12, 74, 110, 0.3);
    background: rgba(12, 74, 110, 0.06);
    color: var(--color-primary);
}
@media (max-width: 960px) {
    .side-card { position: static; }
}

.page-shell {
    padding: var(--space-7) 0;
}
.page-shell__grid {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--space-5);
}
@media (max-width: 1024px) {
    .page-shell__grid {
        grid-template-columns: 1fr;
    }
}

.news-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-4);
}
.news-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}
.news-item img {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    display: block;
}
.news-item__body {
    padding: var(--space-4);
}
.news-item__meta {
    color: var(--color-text-muted);
    font-size: 0.92rem;
    margin-bottom: var(--space-2);
}

.case-card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
    display: grid;
    gap: var(--space-3);
}
.case-card img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    border-radius: var(--radius-sm);
    display: block;
}
.case-card__tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}
.tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    background: rgba(12, 74, 110, 0.08);
    color: var(--color-primary);
    font-weight: 700;
    font-size: 0.92rem;
}

.timeline {
    border-left: 2px solid var(--color-border);
    padding-left: var(--space-4);
    display: grid;
    gap: var(--space-4);
}
.timeline__item {
    position: relative;
}
.timeline__item::before {
    content: "";
    position: absolute;
    left: -var(--space-4);
    top: 4px;
    width: 12px;
    height: 12px;
    border-radius: 3px;
    background: var(--color-primary);
}
.timeline__year {
    font-weight: 760;
    color: var(--color-primary);
    margin: 0 0 4px;
}
.timeline__desc {
    margin: 0;
    color: var(--color-text-muted);
}

.table-like {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}
.table-like th,
.table-like td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--color-border);
    text-align: left;
}
.table-like th {
    background: var(--color-surface-2);
    font-weight: 760;
}
.table-like tr:last-child td {
    border-bottom: none;
}

.form-grid {
    display: grid;
    gap: var(--space-4);
}
.input {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: #FFFFFF;
}
.input:focus {
    outline: 2px solid rgba(12, 74, 110, 0.2);
    border-color: var(--color-primary);
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    background: rgba(34, 197, 94, 0.12);
    color: #065F46;
    font-weight: 700;
}