/* ==========================================================================
   太玺官网 - 主样式
   ========================================================================== */

:root {
    --c-primary: #2563eb;
    --c-primary-dark: #1d4ed8;
    --c-primary-light: #3b82f6;
    --c-cyan: #06b6d4;
    --c-ink: #0b1220;
    --c-ink-soft: #1a2438;
    --c-text: #1f2937;
    --c-text-soft: #4b5563;
    --c-muted: #6b7280;
    --c-line: #e5e7eb;
    --c-bg: #ffffff;
    --c-bg-soft: #f6f8fc;
    --grad-brand: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
    --grad-dark: linear-gradient(135deg, #0b1220 0%, #152238 55%, #0f2a4a 100%);
    --shadow-sm: 0 2px 8px rgba(15, 23, 42, .06);
    --shadow-md: 0 10px 30px rgba(15, 23, 42, .08);
    --shadow-lg: 0 24px 60px rgba(15, 23, 42, .12);
    --radius-sm: 8px;
    --radius: 14px;
    --radius-lg: 22px;
    --header-h: 72px;
    --maxw: 1200px;
    --ease: cubic-bezier(.4, 0, .2, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: var(--c-text);
    background: var(--c-bg);
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { margin: 0 0 .6em; line-height: 1.3; font-weight: 700; }
p { margin: 0 0 1em; }
ul { margin: 0; padding: 0; list-style: none; }

.container {
    width: 100%;
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 0 24px;
}

.icon { width: 24px; height: 24px; flex: none; }
.icon-sm { width: 18px; height: 18px; }
.icon-lg { width: 32px; height: 32px; }

.skip-link {
    position: absolute; left: -9999px; top: 0; z-index: 200;
    background: var(--c-primary); color: #fff; padding: 10px 18px;
}
.skip-link:focus { left: 12px; top: 12px; }

/* --------------------------------------------------------- 按钮 */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 12px 26px; border: 1px solid transparent; border-radius: 999px;
    font-size: 15px; font-weight: 600; cursor: pointer;
    transition: all .28s var(--ease); white-space: nowrap;
}
.btn-sm { padding: 9px 18px; font-size: 14px; }
.btn-lg { padding: 15px 34px; font-size: 16px; }
.btn-primary { background: var(--grad-brand); color: #fff; box-shadow: 0 8px 22px rgba(37, 99, 235, .28); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 32px rgba(37, 99, 235, .36); }
.btn-outline { border-color: rgba(255, 255, 255, .38); color: #fff; }
.btn-outline:hover { background: rgba(255, 255, 255, .12); border-color: #fff; }
.btn-light { background: #fff; color: var(--c-primary-dark); }
.btn-light:hover { transform: translateY(-2px); box-shadow: 0 14px 32px rgba(0, 0, 0, .18); }
.btn-ghost-light { border-color: rgba(255, 255, 255, .38); color: #fff; }
.btn-ghost-light:hover { background: rgba(255, 255, 255, .12); }
.btn-block { width: 100%; }
.btn:disabled { opacity: .6; cursor: not-allowed; transform: none; }

/* --------------------------------------------------------- 头部 */
.site-header {
    position: sticky; top: 0; z-index: 100;
    background: rgba(255, 255, 255, .82);
    backdrop-filter: saturate(180%) blur(14px);
    border-bottom: 1px solid rgba(15, 23, 42, .07);
    transition: box-shadow .3s var(--ease);
}
.site-header.is-scrolled { box-shadow: var(--shadow-sm); }

.header-inner {
    height: var(--header-h);
    display: flex; align-items: center; justify-content: space-between; gap: 20px;
}

.brand { display: flex; align-items: center; gap: 11px; }
.brand-mark {
    width: 40px; height: 40px; display: grid; place-items: center;
    border-radius: 11px; background: var(--grad-brand); color: #fff;
    font-weight: 700; font-size: 19px; box-shadow: 0 6px 16px rgba(37, 99, 235, .3);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text strong { font-size: 18px; letter-spacing: 2px; color: var(--c-ink); }
.brand-text small { font-size: 11px; color: var(--c-muted); letter-spacing: 1px; }

.main-nav { display: flex; align-items: center; gap: 4px; }
.nav-link {
    position: relative; padding: 8px 14px; font-size: 15px; font-weight: 500;
    color: var(--c-text-soft); border-radius: 8px; transition: color .25s var(--ease);
}
.nav-link:hover { color: var(--c-primary); }
.nav-link.is-active { color: var(--c-primary); font-weight: 600; }
.nav-link.is-active::after {
    content: ""; position: absolute; left: 14px; right: 14px; bottom: 2px;
    height: 2px; border-radius: 2px; background: var(--grad-brand);
}

.header-actions { display: flex; align-items: center; gap: 14px; }

.nav-toggle {
    display: none; width: 42px; height: 42px; border: 1px solid var(--c-line);
    background: #fff; border-radius: 10px; cursor: pointer;
    flex-direction: column; align-items: center; justify-content: center; gap: 4px;
}
.nav-toggle span {
    display: block; width: 18px; height: 2px; background: var(--c-ink);
    border-radius: 2px; transition: transform .3s var(--ease), opacity .2s var(--ease);
}
.nav-toggle.is-open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* --------------------------------------------------------- Hero */
.hero {
    position: relative; overflow: hidden;
    padding: 96px 0 110px; background: var(--grad-dark); color: #fff;
}
.hero::before,
.hero::after {
    content: ""; position: absolute; border-radius: 50%; pointer-events: none;
    filter: blur(10px);
}
.hero::before {
    width: 520px; height: 520px; top: -190px; right: -120px;
    background: radial-gradient(circle, rgba(37, 99, 235, .55), transparent 68%);
}
.hero::after {
    width: 440px; height: 440px; bottom: -220px; left: -110px;
    background: radial-gradient(circle, rgba(6, 182, 212, .38), transparent 70%);
}
.hero .container { position: relative; z-index: 2; }

.hero-grid {
    display: grid; grid-template-columns: 1.05fr .95fr; gap: 60px; align-items: center;
}

.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 6px 16px 6px 6px; margin-bottom: 22px;
    background: rgba(255, 255, 255, .08); border: 1px solid rgba(255, 255, 255, .16);
    border-radius: 999px; font-size: 13px; color: rgba(255, 255, 255, .88);
}
.hero-badge b {
    padding: 3px 10px; border-radius: 999px; background: var(--grad-brand);
    font-size: 12px; font-weight: 600;
}

.hero h1 { font-size: clamp(32px, 4.4vw, 52px); margin-bottom: 20px; letter-spacing: -.5px; }
.hero h1 .accent {
    background: linear-gradient(120deg, #60a5fa 0%, #22d3ee 100%);
    -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-lead { font-size: 17px; color: rgba(255, 255, 255, .78); max-width: 540px; margin-bottom: 32px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 40px; }

.hero-stats { display: flex; flex-wrap: wrap; gap: 36px; }
.hero-stats .stat b {
    display: block; font-size: 28px; font-weight: 700;
    background: linear-gradient(120deg, #93c5fd, #67e8f9);
    -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-stats .stat span { font-size: 13px; color: rgba(255, 255, 255, .62); }

/* 手机外框预览 */
.hero-visual { display: flex; justify-content: center; }
.phone-frame {
    position: relative; width: 292px; padding: 12px;
    border-radius: 40px; background: rgba(255, 255, 255, .07);
    border: 1px solid rgba(255, 255, 255, .16);
    box-shadow: 0 34px 70px rgba(0, 0, 0, .45);
    animation: float 6s ease-in-out infinite;
}
.phone-screen {
    border-radius: 30px; overflow: hidden; background: #f8fafc;
    aspect-ratio: 9 / 17.5; display: flex; flex-direction: column;
}
.phone-status {
    display: flex; justify-content: space-between; padding: 12px 16px 8px;
    font-size: 11px; color: #94a3b8; background: #fff;
}
.phone-appbar {
    padding: 6px 16px 12px; background: var(--grad-brand); color: #fff;
    font-size: 13px; font-weight: 600; text-align: center; border-radius: 0 0 14px 14px;
}
.phone-banner {
    margin: 12px; padding: 16px; border-radius: 14px; color: #fff;
    background: linear-gradient(135deg, #1e40af, #0891b2); font-size: 12px;
}
.phone-banner b { display: block; font-size: 15px; margin-bottom: 4px; }
.phone-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; padding: 4px 14px 14px; }
.phone-grid i {
    display: block; height: 38px; border-radius: 10px; background: #e2e8f0;
}
.phone-grid i:nth-child(3n) { background: #dbeafe; }
.phone-list { padding: 0 14px; display: flex; flex-direction: column; gap: 9px; flex: 1; }
.phone-list i { display: block; height: 52px; border-radius: 12px; background: #f1f5f9; }
.phone-tabbar {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px;
    padding: 10px 14px 14px; border-top: 1px solid #e5e7eb; background: #fff;
}
.phone-tabbar i { display: block; height: 16px; border-radius: 5px; background: #e2e8f0; }
.phone-tabbar i:first-child { background: var(--c-primary); }

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-14px); }
}

/* --------------------------------------------------------- 通用区块 */
.section { padding: 92px 0; }
.section-soft { background: var(--c-bg-soft); }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 54px; }
.section-tag {
    display: inline-block; padding: 5px 14px; margin-bottom: 14px;
    border-radius: 999px; background: rgba(37, 99, 235, .09);
    color: var(--c-primary-dark); font-size: 13px; font-weight: 600; letter-spacing: 1px;
}
.section-head h2 { font-size: clamp(26px, 3vw, 36px); color: var(--c-ink); }
.section-head p { color: var(--c-muted); font-size: 16px; margin: 0; }

/* --------------------------------------------------------- 服务卡片 */
.service-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); gap: 26px;
}
.service-card {
    position: relative; padding: 34px 30px; background: #fff;
    border: 1px solid var(--c-line); border-radius: var(--radius-lg);
    transition: all .34s var(--ease); overflow: hidden;
}
.service-card::before {
    content: ""; position: absolute; inset: 0; opacity: 0;
    background: linear-gradient(160deg, rgba(37, 99, 235, .05), rgba(6, 182, 212, .05));
    transition: opacity .34s var(--ease);
}
.service-card:hover { transform: translateY(-8px); border-color: rgba(37, 99, 235, .28); box-shadow: var(--shadow-lg); }
.service-card:hover::before { opacity: 1; }

.service-icon {
    position: relative; width: 58px; height: 58px; display: grid; place-items: center;
    border-radius: 16px; background: var(--grad-brand); color: #fff;
    margin-bottom: 22px; box-shadow: 0 10px 24px rgba(37, 99, 235, .25);
}
.service-card h3 { position: relative; font-size: 20px; color: var(--c-ink); margin-bottom: 4px; }
.service-sub { position: relative; display: block; font-size: 12px; color: var(--c-muted); letter-spacing: 1px; margin-bottom: 14px; }
.service-card p { position: relative; font-size: 15px; color: var(--c-text-soft); margin-bottom: 20px; }
.service-link {
    position: relative; display: inline-flex; align-items: center; gap: 6px;
    color: var(--c-primary); font-size: 14px; font-weight: 600;
}
.service-link .icon { width: 16px; height: 16px; transition: transform .28s var(--ease); }
.service-card:hover .service-link .icon { transform: translateX(5px); }

/* --------------------------------------------------------- 优势 */
.advantage-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px;
}
.advantage-item {
    padding: 30px 26px; background: #fff; border-radius: var(--radius);
    box-shadow: var(--shadow-sm); border: 1px solid rgba(15, 23, 42, .05);
    transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.advantage-item:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.advantage-item .icon { color: var(--c-primary); margin-bottom: 16px; }
.advantage-item h3 { font-size: 17px; color: var(--c-ink); margin-bottom: 8px; }
.advantage-item p { font-size: 14px; color: var(--c-muted); margin: 0; }

/* --------------------------------------------------------- 流程 */
.process-flow {
    display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; position: relative;
}
.process-step { position: relative; text-align: center; padding: 0 10px; }
.process-step .dot {
    width: 62px; height: 62px; margin: 0 auto 18px; display: grid; place-items: center;
    border-radius: 50%; background: #fff; border: 2px solid rgba(37, 99, 235, .25);
    color: var(--c-primary); font-size: 19px; font-weight: 700;
    transition: all .3s var(--ease); z-index: 2; position: relative;
}
.process-step:hover .dot { background: var(--grad-brand); color: #fff; border-color: transparent; }
.process-step h3 { font-size: 16px; color: var(--c-ink); margin-bottom: 6px; }
.process-step p { font-size: 13px; color: var(--c-muted); margin: 0; }
.process-step:not(:last-child)::after {
    content: ""; position: absolute; top: 31px; left: 58%; right: -42%;
    height: 2px; background: repeating-linear-gradient(to right, rgba(37, 99, 235, .3) 0 6px, transparent 6px 12px);
}

/* --------------------------------------------------------- 案例 */
.case-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(330px, 1fr)); gap: 26px; }
.case-card {
    display: flex; flex-direction: column; background: #fff;
    border: 1px solid var(--c-line); border-radius: var(--radius-lg);
    overflow: hidden; transition: all .34s var(--ease);
}
.case-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); border-color: rgba(37, 99, 235, .25); }
.case-thumb {
    position: relative; height: 178px; display: grid; place-items: center; color: #fff;
}
.case-thumb::after {
    content: ""; position: absolute; inset: 0;
    background: radial-gradient(circle at 30% 20%, rgba(255, 255, 255, .22), transparent 60%);
}
.case-thumb .icon { width: 54px; height: 54px; opacity: .92; position: relative; z-index: 1; }
.case-cat {
    position: absolute; top: 14px; left: 14px; z-index: 2;
    padding: 4px 12px; border-radius: 999px; font-size: 12px; font-weight: 600;
    background: rgba(255, 255, 255, .22); border: 1px solid rgba(255, 255, 255, .3);
}
.case-body { padding: 24px 26px 26px; display: flex; flex-direction: column; flex: 1; }
.case-body h3 { font-size: 18px; color: var(--c-ink); margin-bottom: 6px; }
.case-client { font-size: 13px; color: var(--c-muted); margin-bottom: 12px; }
.case-body p { font-size: 14.5px; color: var(--c-text-soft); }
.case-result { display: flex; flex-wrap: wrap; gap: 8px; margin: 4px 0 16px; }
.case-result span {
    padding: 4px 12px; border-radius: 999px; font-size: 12.5px; font-weight: 600;
    background: rgba(37, 99, 235, .08); color: var(--c-primary-dark);
}
.case-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: auto; padding-top: 14px; border-top: 1px solid var(--c-line); }
.case-tags span { font-size: 12px; color: var(--c-muted); }
.case-tags span::before { content: "#"; color: var(--c-primary); }

/* --------------------------------------------------------- 新闻 */
.news-list { display: grid; gap: 18px; }
.news-item {
    display: grid; grid-template-columns: 108px 1fr auto; gap: 28px; align-items: center;
    padding: 26px 30px; background: #fff; border: 1px solid var(--c-line);
    border-radius: var(--radius); transition: all .3s var(--ease);
}
.news-item:hover { transform: translateX(6px); border-color: rgba(37, 99, 235, .3); box-shadow: var(--shadow-md); }
.news-date { text-align: center; padding-right: 24px; border-right: 1px solid var(--c-line); }
.news-date b { display: block; font-size: 26px; color: var(--c-ink); line-height: 1.1; }
.news-date span { font-size: 12px; color: var(--c-muted); }
.news-item h3 { font-size: 18px; color: var(--c-ink); margin: 0 0 6px; }
.news-item p { font-size: 14.5px; color: var(--c-muted); margin: 0; }
.news-cat {
    display: inline-block; margin-bottom: 6px; padding: 2px 10px; border-radius: 999px;
    font-size: 12px; background: rgba(37, 99, 235, .08); color: var(--c-primary-dark);
}
.news-more { color: var(--c-primary); display: inline-flex; align-items: center; gap: 6px; }
.news-more .icon { width: 18px; height: 18px; }

/* --------------------------------------------------------- 页脚 */
.site-footer { background: #0b1220; color: rgba(255, 255, 255, .68); padding-top: 64px; font-size: 14.5px; }
.footer-main {
    display: grid; grid-template-columns: 1.8fr 1fr 1fr; gap: 40px;
    padding-bottom: 46px; border-bottom: 1px solid rgba(255, 255, 255, .09);
}
.footer-about p { margin-top: 18px; line-height: 1.85; color: rgba(255, 255, 255, .55); font-size: 14px; }
.brand-footer .brand-text strong { color: #fff; }
.brand-footer .brand-text small { color: rgba(255, 255, 255, .45); }
.footer-col h3 { font-size: 15px; color: #fff; margin-bottom: 18px; font-weight: 600; }
.footer-col ul li { margin-bottom: 11px; }
.footer-col ul li a { color: rgba(255, 255, 255, .6); transition: color .25s var(--ease); }
.footer-col ul li a:hover { color: #fff; }
.footer-bottom {
    display: flex; flex-wrap: wrap; gap: 12px; align-items: center;
    justify-content: space-between; padding: 22px 24px; font-size: 13.5px;
    color: rgba(255, 255, 255, .48);
}
.footer-bottom p { margin: 0; }
.footer-bottom a:hover { color: #fff; }

/* --------------------------------------------------------- 返回顶部 */
.back-to-top {
    position: fixed; right: 26px; bottom: 26px; z-index: 90;
    width: 46px; height: 46px; display: grid; place-items: center;
    border: none; border-radius: 50%; background: var(--grad-brand); color: #fff;
    cursor: pointer; opacity: 0; visibility: hidden; transform: translateY(12px);
    transition: all .3s var(--ease); box-shadow: 0 10px 26px rgba(37, 99, 235, .35);
}
.back-to-top svg { width: 20px; height: 20px; }
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { transform: translateY(-4px); }

/* --------------------------------------------------------- 内页通用 */
.page-hero {
    position: relative; padding: 74px 0 66px; background: var(--grad-dark);
    color: #fff; text-align: center; overflow: hidden;
}
.page-hero::before {
    content: ""; position: absolute; width: 520px; height: 520px; top: -260px; left: 50%;
    transform: translateX(-50%); border-radius: 50%;
    background: radial-gradient(circle, rgba(37, 99, 235, .45), transparent 70%);
}
.page-hero .container { position: relative; z-index: 2; }
.page-hero h1 { font-size: clamp(28px, 3.6vw, 40px); margin-bottom: 12px; }
.page-hero p { color: rgba(255, 255, 255, .72); max-width: 640px; margin: 0 auto; }

.breadcrumb {
    display: flex; justify-content: center; flex-wrap: wrap; gap: 8px;
    font-size: 13.5px; color: rgba(255, 255, 255, .55); margin-bottom: 16px;
}
.breadcrumb a:hover { color: #fff; }

/* --------------------------------------------------------- 服务详情 */
.detail-layout { display: grid; grid-template-columns: 1fr 320px; gap: 46px; align-items: start; }
.detail-body h2 { font-size: 24px; color: var(--c-ink); margin-top: 40px; }
.detail-body h2:first-child { margin-top: 0; }
.detail-body p { color: var(--c-text-soft); }
.feature-list li {
    display: flex; gap: 12px; align-items: flex-start;
    padding: 13px 0; border-bottom: 1px dashed var(--c-line); color: var(--c-text-soft);
}
.feature-list li:last-child { border-bottom: none; }
.feature-list .icon { width: 20px; height: 20px; color: #16a34a; margin-top: 3px; }

.tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; }
.tag-cloud span {
    padding: 7px 16px; border-radius: 999px; font-size: 13.5px;
    background: var(--c-bg-soft); color: var(--c-text-soft); border: 1px solid var(--c-line);
}

.side-card {
    padding: 30px 26px; border-radius: var(--radius-lg); background: var(--c-bg-soft);
    border: 1px solid var(--c-line); margin-bottom: 22px;
}
.side-card h3 { font-size: 17px; color: var(--c-ink); margin-bottom: 16px; }
.side-card dl { margin: 0; display: grid; gap: 14px; }
.side-card dt { font-size: 12.5px; color: var(--c-muted); margin-bottom: 2px; }
.side-card dd { margin: 0; font-size: 15px; font-weight: 600; color: var(--c-ink); }
.side-card.is-dark { background: var(--grad-dark); color: #fff; border-color: transparent; }
.side-card.is-dark h3 { color: #fff; }
.side-card.is-dark p { color: rgba(255, 255, 255, .7); font-size: 14px; }

.side-service-list li { border-bottom: 1px solid var(--c-line); }
.side-service-list li:last-child { border-bottom: none; }
.side-service-list a {
    display: flex; align-items: center; justify-content: space-between; gap: 10px;
    padding: 13px 0; font-size: 15px; color: var(--c-text-soft);
    transition: color .25s var(--ease), padding-left .25s var(--ease);
}
.side-service-list a:hover, .side-service-list a.is-active { color: var(--c-primary); padding-left: 6px; }
.side-service-list a.is-active { font-weight: 600; }

/* --------------------------------------------------------- 关于页 */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.about-copy h2 { font-size: clamp(24px, 2.8vw, 32px); color: var(--c-ink); }
.about-copy p { color: var(--c-text-soft); }
.about-visual {
    position: relative; border-radius: var(--radius-lg); overflow: hidden;
    min-height: 340px; background: var(--grad-dark); padding: 34px; color: #fff;
    display: flex; flex-direction: column; justify-content: space-between;
}
.about-visual::after {
    content: ""; position: absolute; width: 300px; height: 300px; right: -100px; bottom: -140px;
    border-radius: 50%; background: radial-gradient(circle, rgba(6, 182, 212, .4), transparent 70%);
}
.about-visual h3 { position: relative; z-index: 2; font-size: 22px; }
.about-visual p { position: relative; z-index: 2; color: rgba(255, 255, 255, .72); font-size: 14.5px; }
.about-visual ul { position: relative; z-index: 2; display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.about-visual li {
    padding: 14px; border-radius: 12px; background: rgba(255, 255, 255, .07);
    border: 1px solid rgba(255, 255, 255, .12);
}
.about-visual li b { display: block; font-size: 20px; }

.timeline { position: relative; padding-left: 34px; }
.timeline::before {
    content: ""; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 2px;
    background: linear-gradient(to bottom, var(--c-primary), var(--c-cyan));
}
.timeline-item { position: relative; padding-bottom: 30px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
    content: ""; position: absolute; left: -34px; top: 6px; width: 16px; height: 16px;
    border-radius: 50%; background: #fff; border: 3px solid var(--c-primary);
}
.timeline-item .year { font-size: 15px; font-weight: 700; color: var(--c-primary); }
.timeline-item h3 { font-size: 18px; color: var(--c-ink); margin: 4px 0 6px; }
.timeline-item p { font-size: 14.5px; color: var(--c-muted); margin: 0; }

.value-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 22px; }
.value-item {
    padding: 28px 24px; border-radius: var(--radius); background: #fff;
    box-shadow: var(--shadow-sm); text-align: center;
}
.value-item .icon { color: var(--c-primary); margin: 0 auto 14px; }
.value-item h3 { font-size: 16px; color: var(--c-ink); margin-bottom: 8px; }
.value-item p { font-size: 14px; color: var(--c-muted); margin: 0; }

/* --------------------------------------------------------- 文章详情 */
.article { max-width: 820px; margin: 0 auto; }
.article-meta {
    display: flex; flex-wrap: wrap; gap: 18px; align-items: center;
    padding-bottom: 20px; margin-bottom: 28px; border-bottom: 1px solid var(--c-line);
    font-size: 13.5px; color: var(--c-muted);
}
.article-body h2 { font-size: 22px; color: var(--c-ink); margin-top: 36px; }
.article-body p { color: var(--c-text-soft); font-size: 16px; line-height: 1.9; }
.article-nav {
    display: flex; flex-wrap: wrap; gap: 14px; justify-content: space-between;
    margin-top: 46px; padding-top: 26px; border-top: 1px solid var(--c-line);
}

/* --------------------------------------------------------- 过滤器 */
.filter-bar {
    display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-bottom: 38px;
}
.filter-btn {
    padding: 8px 20px; border-radius: 999px; font-size: 14px; cursor: pointer;
    border: 1px solid var(--c-line); background: #fff; color: var(--c-text-soft);
    transition: all .26s var(--ease);
}
.filter-btn:hover { border-color: var(--c-primary); color: var(--c-primary); }
.filter-btn.is-active { background: var(--grad-brand); color: #fff; border-color: transparent; }

/* --------------------------------------------------------- 空状态 */
.empty-state { padding: 70px 20px; text-align: center; color: var(--c-muted); }

/* --------------------------------------------------------- 滚动动效 */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }

/* --------------------------------------------------------- 响应式 */
@media (max-width: 1024px) {
    .hero-grid { grid-template-columns: 1fr; gap: 44px; }
    .hero-visual { order: -1; }
    .phone-frame { width: 244px; }
    .detail-layout, .about-grid { grid-template-columns: 1fr; gap: 34px; }
    .process-flow { grid-template-columns: repeat(3, 1fr); gap: 30px 20px; }
    .process-step:nth-child(3)::after { display: none; }
    .footer-main { grid-template-columns: 1fr 1fr; gap: 34px; }
}

@media (max-width: 900px) {
    .nav-toggle { display: flex; }
    .main-nav {
        position: absolute; top: var(--header-h); left: 0; right: 0;
        flex-direction: column; align-items: stretch; gap: 0;
        padding: 10px 20px 20px; background: #fff;
        border-bottom: 1px solid var(--c-line); box-shadow: var(--shadow-md);
        display: none;
    }
    .main-nav.is-open { display: flex; }
    .nav-link { padding: 13px 6px; border-bottom: 1px solid var(--c-line); }
    .nav-link.is-active::after { display: none; }
    .section { padding: 66px 0; }
    .news-item { grid-template-columns: 1fr; gap: 14px; }
    .news-date { display: flex; gap: 10px; align-items: baseline; text-align: left; padding: 0; border: none; }
    .news-date b { font-size: 20px; }
}

@media (max-width: 640px) {
    .container { padding: 0 18px; }
    .hero { padding: 62px 0 74px; }
    .hero-stats { gap: 24px; }
    .hero-stats .stat b { font-size: 24px; }
    .service-grid, .case-grid, .advantage-grid, .contact-cards, .form-row, .value-grid { grid-template-columns: 1fr; }
    .process-flow { grid-template-columns: 1fr 1fr; gap: 26px 14px; }
    .process-step::after { display: none; }
    .footer-main { grid-template-columns: 1fr; }
    .about-visual ul { grid-template-columns: 1fr; }
    .btn-lg { padding: 13px 26px; }
}

@media (prefers-reduced-motion: reduce) {
    * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
    html { scroll-behavior: auto; }
}