/* ==========================================================================
   MK-09 站点样式：深石墨底技术研发型版式，直角、一像素描边、无阴影无圆角
   ========================================================================== */

:root {
    --bg: #101215;
    --panel: #1b1d22;
    --panel-soft: #15171b;
    --line: #2a2d34;
    --line-strong: #3b3f47;
    --ink: #e7e9ec;
    --muted: #98a0a8;
    --dim: #767e86;
    --amber: #f0a92a;
    --mono: "SFMono-Regular", "Menlo", "Consolas", "Liberation Mono", monospace;
    --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

html body {
    margin: 0;
    background-color: var(--bg);
    color: var(--ink);
    font-family: var(--sans);
    font-size: 16px;
    line-height: 1.75;
    overflow-wrap: break-word;
    overflow-x: hidden;
}

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

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

body ul,
body ol,
body dl {
    margin: 0;
    padding: 0;
    list-style: none;
}

body p {
    margin: 0 0 14px;
}

body h1,
body h2,
body h3 {
    margin: 0 0 12px;
    line-height: 1.35;
    font-weight: 600;
}

body h1 {
    font-size: 30px;
    letter-spacing: 0.01em;
}

body h2 {
    font-size: 22px;
}

body h3 {
    font-size: 17px;
}

/* ---------- 通用栅格与容器 ---------- */

.wrap {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding-left: 20px;
    padding-right: 20px;
}

.grid-12 {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 24px;
}

.grid-12 > * {
    min-width: 0;
}

.c3 {
    grid-column: span 3;
}

.c4 {
    grid-column: span 4;
}

.c5 {
    grid-column: span 5;
}

.c6 {
    grid-column: span 6;
}

.c7 {
    grid-column: span 7;
}

.c8 {
    grid-column: span 8;
}

/* ---------- 等宽标签与分区标记 ---------- */

.tag-mono,
.sec-index {
    display: inline-block;
    font-family: var(--mono);
    font-size: 12px;
    line-height: 1.4;
    letter-spacing: 0.08em;
    color: var(--muted);
    text-transform: uppercase;
    border-bottom: 1px solid var(--amber);
    padding-bottom: 3px;
}

.sec-index {
    margin-bottom: 10px;
}

.sec-title {
    font-size: 26px;
}

.sec-head {
    margin-bottom: 32px;
}

.sec {
    padding: 64px 0;
    border-top: 1px solid var(--line);
}

.sec-head .c8 p:last-child {
    margin-bottom: 0;
    color: var(--muted);
}

/* ---------- 图片统一约束 ---------- */

.fig {
    margin: 0;
    border: 1px solid var(--line);
    background-color: var(--panel-soft);
    overflow: hidden;
}

.fig img {
    width: 100%;
    height: auto;
    object-fit: cover;
    max-height: 520px;
}

.fig-hero img {
    aspect-ratio: 16 / 9;
    max-height: 460px;
}

.fig-card-a img,
.fig-card-b img {
    aspect-ratio: 3 / 2;
    max-height: 240px;
}

.fig-card-c img {
    aspect-ratio: 16 / 10;
    object-position: center 30%;
    max-height: 240px;
}

.fig-card-d img {
    aspect-ratio: 1 / 1;
    object-position: 30% center;
    max-height: 240px;
}

.fig-band img {
    aspect-ratio: 3 / 1;
    max-height: 320px;
}

.fig-port-a img {
    aspect-ratio: 4 / 5;
    object-position: center 20%;
    max-height: 320px;
}

.fig-port-b img {
    aspect-ratio: 1 / 1;
    object-position: center 35%;
    max-height: 300px;
}

.fig-square img {
    aspect-ratio: 1 / 1;
    max-height: 300px;
}

.fig-square-tall img {
    aspect-ratio: 3 / 4;
    object-position: center 30%;
    max-height: 360px;
}

/* ---------- 按钮与文字链 ---------- */

.cta-bar,
.open-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 20px;
}

.btn-solid,
.btn-line {
    display: inline-block;
    padding: 11px 20px;
    font-size: 15px;
    border: 1px solid var(--amber);
    background-color: var(--amber);
    color: #14161a;
    font-weight: 600;
}

.btn-line {
    border-color: var(--line-strong);
    background-color: transparent;
    color: var(--ink);
}

.btn-solid:hover,
.btn-line:hover {
    border-color: var(--amber);
    color: var(--amber);
    background-color: transparent;
}

.btn-line:hover {
    color: #14161a;
    background-color: var(--amber);
}

.text-link {
    display: inline-block;
    margin-top: 6px;
    border-bottom: 1px solid var(--amber);
    padding-bottom: 2px;
    color: var(--ink);
}

.text-link:hover {
    color: var(--amber);
}

/* ---------- 页头：两行导航 ---------- */

.tri-nav {
    background-color: var(--panel-soft);
    border-bottom: 1px solid var(--line);
}

.status-line {
    border-bottom: 1px solid var(--line);
}

.status-line p {
    max-width: 1200px;
    margin: 0 auto;
    padding: 8px 20px;
    font-family: var(--mono);
    font-size: 12px;
    line-height: 1.6;
    color: var(--dim);
}

.nav-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    min-height: 62px;
}

.brand-mark {
    font-family: var(--mono);
    font-size: 15px;
    letter-spacing: 0.1em;
    color: var(--ink);
    padding-right: 16px;
    border-right: 1px solid var(--line);
}

.nav-toggle {
    display: none;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    font-family: var(--mono);
    font-size: 12px;
    color: var(--ink);
    background-color: transparent;
    border: 1px solid var(--line-strong);
    cursor: pointer;
}

.nav-panel {
    display: flex;
    align-items: center;
    gap: 18px;
    flex: 1 1 auto;
}

.nav-group {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 14px;
}

.nav-group a {
    color: var(--muted);
    padding-bottom: 2px;
    border-bottom: 1px solid transparent;
}

.nav-group a:hover,
.nav-group a[aria-current="page"] {
    color: var(--ink);
    border-bottom-color: var(--amber);
}

.divider {
    width: 1px;
    height: 18px;
    background-color: var(--line-strong);
}

.client-link {
    margin-left: auto;
    padding: 8px 14px;
    font-size: 14px;
    color: var(--ink);
    border: 1px solid var(--line-strong);
}

.client-link:hover {
    border-color: var(--amber);
    color: var(--amber);
}

/* ---------- 首页 Hero ---------- */

.lab-hero {
    padding: 56px 0 0;
    border-bottom: 1px solid var(--line);
}

.hero-grid {
    align-items: center;
}

.lab-copy h1 {
    margin-top: 14px;
    font-size: 34px;
}

.lab-copy p {
    color: var(--muted);
    max-width: 46em;
}

.lab-visual {
    position: relative;
}

.grid-overlay {
    position: absolute;
    inset: 0;
    pointer-events: none;
    background-image:
        repeating-linear-gradient(to right, rgba(240, 169, 42, 0.26) 0 1px, transparent 1px 12.5%),
        repeating-linear-gradient(to bottom, rgba(240, 169, 42, 0.2) 0 1px, transparent 1px 20%);
}

.lab-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0;
    margin-top: 36px;
    border-top: 1px solid var(--line);
}

.lab-tags li {
    flex: 1 1 180px;
    padding: 14px 16px 14px 0;
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: 0.08em;
    color: var(--dim);
    border-right: 1px solid var(--line);
}

.lab-tags li:last-child {
    border-right: 0;
}

/* ---------- 核心技术：四列技术块 ---------- */

.tech-grid {
    align-items: stretch;
}

.tech-block {
    padding: 22px;
    background-color: var(--panel);
    border: 1px solid var(--line);
}

.tech-block h2 {
    font-size: 18px;
    margin-top: 12px;
}

.tech-block p {
    font-size: 14px;
    color: var(--muted);
    margin-bottom: 10px;
}

.tick-list {
    margin: 14px 0 18px;
    border-top: 1px solid var(--line);
}

.tick-list li {
    padding: 7px 0;
    font-size: 13px;
    color: var(--muted);
    border-bottom: 1px solid var(--line);
}

.tick-list li::before {
    content: "";
    display: inline-block;
    width: 8px;
    height: 8px;
    margin-right: 10px;
    background-color: var(--amber);
}

/* ---------- 平台模块：竖向时间轴 ---------- */

.timeline {
    border-left: 1px solid var(--line);
    margin-left: 6px;
}

.tl-node {
    position: relative;
    padding: 0 0 30px 28px;
}

.tl-node::before {
    content: "";
    position: absolute;
    left: -5px;
    top: 8px;
    width: 9px;
    height: 9px;
    background-color: var(--amber);
}

.tl-node h3 {
    margin-top: 8px;
}

.tl-node p {
    color: var(--muted);
    margin-bottom: 0;
    max-width: 62em;
}

.tl-node.is-active::before {
    background-color: var(--amber);
    outline: 1px solid var(--amber);
}

/* ---------- 实时内容 ---------- */

.wrap-wide {
    max-width: 1200px;
    margin: 0 auto 28px;
    padding-left: 20px;
    padding-right: 20px;
}

.rt-panel {
    border: 1px solid var(--line);
    background-color: var(--panel);
}

.rt-row {
    display: flex;
    gap: 18px;
    padding: 18px 22px;
    border-bottom: 1px solid var(--line);
}

.rt-row:last-child {
    border-bottom: 0;
}

.rt-row .tag-mono {
    flex: 0 0 96px;
    color: var(--amber);
    border-bottom-color: transparent;
    padding-top: 3px;
}

.rt-row p {
    margin: 0;
    color: var(--muted);
    font-size: 15px;
}

/* ---------- 客户端三卡 ---------- */

.client-grid {
    align-items: stretch;
}

.client-card {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 22px;
    background-color: var(--panel);
    border: 1px solid var(--line);
}

.client-card h3 {
    margin: 0;
}

.client-card p {
    margin: 0;
    font-size: 14px;
    color: var(--muted);
}

.client-card .fig {
    margin: 0 0 6px;
}

.client-card .text-link {
    margin-top: auto;
    align-self: flex-start;
}

/* ---------- 支持：4/8 分栏 ---------- */

.support-grid {
    align-items: start;
}

.entry-list {
    border-top: 1px solid var(--line);
}

.entry-list li {
    padding: 16px 0;
    border-bottom: 1px solid var(--line);
}

.entry-list a {
    display: inline-block;
    margin: 6px 0 4px;
    font-size: 16px;
    color: var(--ink);
    border-bottom: 1px solid var(--line-strong);
}

.entry-list a:hover {
    color: var(--amber);
    border-bottom-color: var(--amber);
}

.entry-list p {
    margin: 0;
    font-size: 14px;
    color: var(--muted);
}

.support-notes {
    display: grid;
    gap: 0;
    border-top: 1px solid var(--line);
}

.note-block {
    padding: 18px 0;
    border-bottom: 1px solid var(--line);
}

.note-block h3 {
    margin-bottom: 8px;
}

.note-block p {
    margin: 0;
    color: var(--muted);
    font-size: 15px;
}

/* ---------- 资讯整行列表 ---------- */

.news-head {
    margin-bottom: 18px;
}

.news-rows {
    border-top: 1px solid var(--line);
}

.news-row {
    display: grid;
    grid-template-columns: 110px minmax(0, 1fr) minmax(0, 1.4fr);
    gap: 20px;
    align-items: baseline;
    padding: 18px 0;
    border-bottom: 1px solid var(--line);
}

.news-row h3 {
    margin: 0;
    font-size: 17px;
}

.news-row p {
    margin: 0;
    font-size: 14px;
    color: var(--muted);
}

.news-row.is-active {
    border-bottom-color: var(--amber);
}

/* ---------- 问答：dl ---------- */

.faq-grid {
    align-items: start;
}

.faq-lab {
    border-top: 1px solid var(--line);
}

.faq-lab dt {
    position: relative;
    padding: 14px 0 0 20px;
    font-size: 16px;
    color: var(--ink);
}

.faq-lab dt::before {
    content: "";
    position: absolute;
    left: 0;
    top: 22px;
    width: 8px;
    height: 8px;
    background-color: var(--amber);
}

.faq-lab dd {
    margin: 6px 0 0 24px;
    padding-bottom: 14px;
    font-size: 14px;
    color: var(--muted);
    border-bottom: 1px solid var(--line);
}

.faq-side p {
    color: var(--muted);
    font-size: 14px;
    margin-top: 14px;
}

/* ---------- 关于页 ---------- */

.about-lab {
    padding: 56px 0 0;
    border-bottom: 1px solid var(--line);
}

.about-lab h1 {
    margin-top: 14px;
    font-size: 32px;
}

.about-lab p {
    color: var(--muted);
}

.about-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 28px;
    margin-top: 32px;
    padding-top: 14px;
    padding-bottom: 18px;
    border-top: 1px solid var(--line);
    font-size: 13px;
    color: var(--muted);
}

.about-note {
    padding: 44px 0;
    border-bottom: 1px solid var(--line);
}

.note-label h2 {
    margin-top: 10px;
}

.note-body p {
    color: var(--muted);
}

.note-body p:last-child {
    margin-bottom: 0;
}

.fig-about-split img {
    aspect-ratio: 4 / 5;
    object-position: center 30%;
    max-height: 420px;
}

.fig-about-card {
    margin-top: 28px;
}

.fig-about-card img {
    aspect-ratio: 21 / 9;
    object-position: center 40%;
    max-height: 300px;
}

.about-stages-wrap,
.news-brief,
.prod-note {
    padding: 56px 0;
    border-bottom: 1px solid var(--line);
}

.about-stages {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    border-top: 1px solid var(--line);
    border-left: 1px solid var(--line);
}

.stage-block {
    padding: 20px;
    background-color: var(--panel);
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.stage-block h3 {
    margin-top: 10px;
}

.stage-block p {
    margin: 0;
    font-size: 14px;
    color: var(--muted);
}

.about-openness {
    padding: 56px 0;
}

.about-openness h2 {
    margin-bottom: 14px;
}

.about-openness p {
    color: var(--muted);
}

.fig-about-band img {
    aspect-ratio: 3 / 4;
    object-position: center 55%;
    max-height: 380px;
}

/* ---------- 产品页 ---------- */

.prod-head {
    padding: 52px 0;
    border-bottom: 1px solid var(--line);
}

.prod-head h1 {
    margin-top: 14px;
}

.prod-head p {
    color: var(--muted);
}

.prod-head p:last-child {
    margin-bottom: 0;
}

.prod-module {
    padding: 52px 0;
    border-bottom: 1px solid var(--line);
}

.module-grid {
    align-items: start;
}

.spec-col h2 {
    margin-top: 10px;
}

.spec-col > p {
    color: var(--muted);
}

.tech-spec {
    margin-top: 22px;
    border-top: 1px solid var(--line);
}

.spec-row {
    display: grid;
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 18px;
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
}

.spec-row dt {
    font-family: var(--mono);
    font-size: 13px;
    color: var(--amber);
    letter-spacing: 0.04em;
}

.spec-row dd {
    margin: 0;
    font-size: 14px;
    color: var(--muted);
}

.tech-spec-wide .spec-row {
    grid-template-columns: 160px minmax(0, 1fr);
}

.fig-prod-a img {
    aspect-ratio: 1 / 1;
    max-height: 420px;
}

.fig-prod-b img {
    aspect-ratio: 4 / 3;
    object-position: center 30%;
    max-height: 380px;
}

.fig-prod-c img {
    aspect-ratio: 3 / 4;
    object-position: center 45%;
    max-height: 420px;
}

/* ---------- 资讯页：5fr/3fr 长文布局 ---------- */

.news-head {
    padding: 52px 0 32px;
    border-bottom: 1px solid var(--line);
}

.news-head h1 {
    margin-top: 14px;
}

.news-head p {
    color: var(--muted);
}

.news-meta li {
    padding: 12px 0;
    font-size: 14px;
    color: var(--muted);
    border-bottom: 1px solid var(--line);
}

.news-tech {
    padding: 48px 0;
    border-bottom: 1px solid var(--line);
}

.news-layout {
    display: grid;
    grid-template-columns: 5fr 3fr;
    gap: 32px;
    align-items: start;
}

.long-main {
    padding: 24px;
    background-color: var(--panel);
    border: 1px solid var(--line);
}

.long-main h2 {
    margin-top: 12px;
}

.long-main p {
    color: var(--muted);
}

.fig-news-cover {
    margin-bottom: 18px;
}

.fig-news-cover img {
    aspect-ratio: 21 / 9;
    object-position: center 35%;
    max-height: 260px;
}

.long-side {
    border-top: 1px solid var(--line);
}

.long-side h2 {
    margin: 16px 0;
    font-size: 19px;
}

.fig-news-square {
    margin-bottom: 16px;
}

.fig-news-square img {
    aspect-ratio: 4 / 3;
    object-position: center 25%;
    max-height: 240px;
}

.side-rows {
    border-top: 1px solid var(--line);
}

.side-row {
    display: block;
    padding: 14px 0;
    border-bottom: 1px solid var(--line);
}

.side-row a {
    display: block;
    margin-top: 8px;
    font-size: 15px;
    color: var(--muted);
}

.side-row a:hover {
    color: var(--ink);
}

.brief-grid {
    align-items: stretch;
    margin-bottom: 28px;
}

.brief-card {
    padding: 20px;
    background-color: var(--panel);
    border: 1px solid var(--line);
}

.brief-card h3 {
    margin-top: 10px;
}

.brief-card p {
    margin: 0;
    font-size: 14px;
    color: var(--muted);
}

.fig-news-band img {
    aspect-ratio: 5 / 2;
    object-position: center 60%;
    max-height: 280px;
}

.news-note {
    padding: 48px 0;
}

.news-note p {
    color: var(--muted);
}

.news-note p:last-child {
    margin-bottom: 0;
}

/* ---------- 联系页：三分之一 / 三分之二 ---------- */

.contact-head {
    padding: 52px 0;
    border-bottom: 1px solid var(--line);
}

.contact-head h1 {
    margin-top: 14px;
}

.contact-head p {
    color: var(--muted);
}

.fig-contact-head img {
    aspect-ratio: 4 / 3;
    object-position: center 20%;
    max-height: 320px;
}

.contact-body {
    padding: 48px 0;
    border-bottom: 1px solid var(--line);
}

.desk-layout {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 32px;
    align-items: start;
}

.desk-info h2,
.desk-form-col h2 {
    margin-top: 10px;
}

.desk-info dl {
    margin: 16px 0 26px;
    border-top: 1px solid var(--line);
}

.desk-info dt {
    padding-top: 14px;
    font-family: var(--mono);
    font-size: 13px;
    color: var(--amber);
    letter-spacing: 0.04em;
}

.desk-info dd {
    margin: 6px 0 0;
    padding-bottom: 14px;
    font-size: 14px;
    color: var(--muted);
    border-bottom: 1px solid var(--line);
}

.desk-info p {
    font-size: 14px;
    color: var(--muted);
}

.desk-form-col > p {
    color: var(--muted);
}

.desk-form {
    margin-top: 20px;
    padding: 24px;
    background-color: var(--panel);
    border: 1px solid var(--line);
}

.field {
    margin-bottom: 20px;
}

.field label {
    display: block;
    margin-bottom: 6px;
    font-family: var(--mono);
    font-size: 13px;
    color: var(--muted);
    letter-spacing: 0.04em;
}

.field input,
.field select,
.field textarea {
    width: 100%;
    padding: 10px 2px;
    font-family: var(--sans);
    font-size: 15px;
    color: var(--ink);
    background-color: transparent;
    border: 0;
    border-bottom: 1px solid var(--line-strong);
    border-radius: 0;
}

.field select {
    appearance: none;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
    outline: none;
    border-bottom-color: var(--amber);
}

.field textarea {
    resize: vertical;
    line-height: 1.7;
}

.form-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 16px;
}

.form-actions .btn-solid {
    cursor: pointer;
}

.form-note {
    flex: 1 1 240px;
    margin: 0;
    font-size: 13px;
    color: var(--dim);
}

.form-status {
    margin: 14px 0 0;
    font-size: 14px;
    color: var(--amber);
    min-height: 1.4em;
}

.contact-faq {
    padding: 48px 0 56px;
}

.contact-faq > .wrap > p {
    color: var(--muted);
    margin-bottom: 22px;
}

.faq-trio {
    align-items: stretch;
    margin-bottom: 28px;
}

.trio-item {
    padding: 20px;
    background-color: var(--panel);
    border: 1px solid var(--line);
}

.trio-item h3 {
    font-size: 16px;
}

.trio-item p {
    margin: 0;
    font-size: 14px;
    color: var(--muted);
}

.fig-contact-band img {
    aspect-ratio: 12 / 5;
    object-position: center 70%;
    max-height: 260px;
}

/* ---------- 专题页 ---------- */

.sport-lab-hero {
    padding: 52px 0;
    border-bottom: 1px solid var(--line);
}

.sport-hero-grid {
    align-items: center;
}

.sport-lab-hero h1 {
    margin-top: 14px;
    font-size: 32px;
}

.sport-lab-hero p {
    color: var(--muted);
}

.fig-sport-hero img {
    aspect-ratio: 3 / 4;
    object-position: center 30%;
    max-height: 460px;
}

.sport-modes {
    padding: 56px 0;
    border-bottom: 1px solid var(--line);
}

.mode-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-top: 1px solid var(--line);
    border-left: 1px solid var(--line);
}

.mode-block {
    padding: 22px;
    background-color: var(--panel);
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.mode-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}

.mode-head h2 {
    font-size: 19px;
    margin: 0;
}

.mode-block p {
    margin: 0 0 8px;
    font-size: 14px;
    color: var(--muted);
}

.mode-block p:last-child {
    margin-bottom: 0;
}

.sport-data-note {
    padding: 56px 0;
    border-bottom: 1px solid var(--line);
}

.fig-sport-band {
    max-width: 1200px;
    margin: 0 auto 28px;
    padding: 0 20px;
    border: 0;
    background-color: transparent;
}

.fig-sport-band img {
    aspect-ratio: 8 / 3;
    object-position: center 20%;
    max-height: 300px;
    border: 1px solid var(--line);
}

.note-grid {
    align-items: start;
}

.note-grid p {
    color: var(--muted);
}

.download-list {
    border-top: 1px solid var(--line);
}

.download-list li {
    padding: 12px 0;
    font-size: 14px;
    color: var(--muted);
    border-bottom: 1px solid var(--line);
}

.sport-faq {
    padding: 56px 0;
}

.sport-faq-grid {
    align-items: start;
}

.sport-faq-grid .c4 p {
    color: var(--muted);
    font-size: 14px;
}

/* ---------- 页脚 ---------- */

.lab-foot {
    background-color: var(--panel-soft);
    border-top: 1px solid var(--line);
    padding: 40px 0 28px;
}

.foot-line {
    font-family: var(--mono);
    font-size: 12px;
    line-height: 1.8;
    color: var(--dim);
    padding-bottom: 18px;
    margin-bottom: 26px;
    border-bottom: 1px solid var(--line);
}

.foot-cols h2 {
    font-size: 14px;
    font-family: var(--mono);
    letter-spacing: 0.08em;
    color: var(--muted);
    margin-bottom: 12px;
}

.foot-cols ul li {
    margin-bottom: 9px;
    font-size: 14px;
}

.foot-cols ul a {
    color: var(--muted);
}

.foot-cols ul a:hover {
    color: var(--amber);
}

.foot-note p {
    font-size: 13px;
    color: var(--dim);
}

.foot-copy {
    margin: 18px 0 0;
    padding-top: 16px;
    border-top: 1px solid var(--line);
    font-size: 13px;
    color: var(--dim);
}

/* ---------- 状态类（由脚本添加，不隐藏任何文本） ---------- */

.tri-nav.is-scrolled {
    border-bottom-color: var(--line-strong);
}

.tri-nav.is-scrolled .status-line p {
    color: var(--muted);
}

/* ---------- 响应式：900px ---------- */

@media (max-width: 900px) {
    .tri-nav {
        position: static;
    }

    .nav-row {
        flex-wrap: wrap;
        gap: 10px;
        padding-top: 10px;
        padding-bottom: 10px;
    }

    .brand-mark {
        border-right: 0;
        padding-right: 0;
    }

    .nav-toggle {
        display: inline-flex;
    }

    .nav-panel {
        flex: 1 0 100%;
        display: block;
        overflow-x: auto;
        white-space: nowrap;
        border-top: 1px solid var(--line);
        padding: 10px 0;
    }

    .nav-group {
        display: inline-flex;
        vertical-align: middle;
        padding-right: 18px;
    }

    .divider {
        display: inline-block;
        vertical-align: middle;
        margin-right: 18px;
    }

    .client-link {
        margin-left: 0;
    }

    html.js-ready .nav-panel {
        display: none;
    }

    html.js-ready .tri-nav.nav-open .nav-panel {
        display: block;
    }

    .c3,
    .c4,
    .c5,
    .c6,
    .c7,
    .c8 {
        grid-column: span 12;
    }

    .tech-grid .tech-block {
        grid-column: span 6;
    }

    .about-stages {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .news-layout,
    .desk-layout {
        grid-template-columns: 1fr;
    }

    .news-row {
        grid-template-columns: 96px minmax(0, 1fr);
    }

    .news-row p {
        grid-column: 2;
    }

    .lab-copy h1 {
        font-size: 28px;
    }

    .sec-title {
        font-size: 23px;
    }
}

/* ---------- 响应式：640px ---------- */

@media (max-width: 640px) {
    html body {
        font-size: 15px;
    }

    .sec,
    .about-note,
    .prod-module,
    .contact-body,
    .sport-modes,
    .sport-data-note,
    .sport-faq,
    .about-stages-wrap,
    .news-brief,
    .prod-note {
        padding-top: 40px;
        padding-bottom: 40px;
    }

    .lab-copy h1,
    .about-lab h1,
    .sport-lab-hero h1 {
        font-size: 24px;
    }

    .sec-title {
        font-size: 20px;
    }

    .tech-grid .tech-block,
    .brief-card,
    .trio-item {
        grid-column: span 12;
    }

    .mode-grid,
    .about-stages {
        grid-template-columns: minmax(0, 1fr);
    }

    .rt-row {
        flex-direction: column;
        gap: 8px;
    }

    .rt-row .tag-mono {
        flex: 0 0 auto;
    }

    .spec-row,
    .tech-spec-wide .spec-row {
        grid-template-columns: minmax(0, 1fr);
        gap: 6px;
    }

    .lab-tags li {
        flex: 1 1 100%;
        border-right: 0;
        border-bottom: 1px solid var(--line);
    }

    .news-row {
        grid-template-columns: minmax(0, 1fr);
        gap: 8px;
    }

    .news-row p {
        grid-column: 1;
    }

    .fig img,
    .fig-hero img,
    .fig-band img,
    .fig-news-cover img,
    .fig-contact-band img,
    .fig-sport-band img {
        aspect-ratio: auto;
        max-height: 280px;
    }
}