/* ==========================================================================
   mk-18 深石与铜线 · 材质册式的平台服务站点
   底色深石 #1a1816，卡面 #241f1b，铜线 #b87333，主文字 #d8d2c9
   全部方角、无阴影，层级只靠 1px 铜线与大留白建立
   ========================================================================== */

:root {
    --stone: #1a1816;
    --stone-raise: #241f1b;
    --copper: #b87333;
    --copper-soft: #b8733340;
    --ink: #d8d2c9;
    --ink-dim: #8a8378;
    --serif: "Songti SC", Georgia, "Times New Roman", serif;
    --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

html {
    background: var(--stone);
    scroll-behavior: smooth;
}

html body {
    margin: 0;
    padding: 0;
    background: var(--stone);
    color: var(--ink);
    font-family: var(--sans);
    font-size: 15.5px;
    line-height: 1.9;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

.wrap {
    width: 100%;
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 32px;
    box-sizing: border-box;
}

.band {
    border-top: 1px solid var(--copper-soft);
    padding: 78px 0;
}

.band-tight {
    padding: 54px 0;
}

/* ---------- 标题与正文的字重对比 ---------- */

.wrap h1,
.wrap h2,
.wrap h3,
.wrap h4,
.hdr-bar .brand-mark,
.foot-brand,
.texture-caption h1 {
    font-family: var(--serif);
    font-weight: 400;
    letter-spacing: 0.02em;
    color: var(--ink);
}

.wrap h1 {
    font-size: 38px;
    line-height: 1.3;
    margin: 0 0 18px;
}

.wrap h2 {
    font-size: 29px;
    line-height: 1.4;
    margin: 0 0 24px;
}

.wrap h3 {
    font-size: 19px;
    line-height: 1.55;
    margin: 0 0 10px;
}

.wrap h4 {
    font-size: 16px;
    line-height: 1.5;
    margin: 0 0 10px;
}

.wrap p {
    margin: 0 0 14px;
    color: var(--ink-dim);
}

.lead {
    font-size: 16px;
    color: var(--ink-dim);
    max-width: 780px;
}

.note-line {
    font-size: 13.5px;
    color: var(--ink-dim);
    letter-spacing: 0.04em;
}

hr.copper-rule {
    height: 1px;
    border: 0;
    background: var(--copper);
    margin: 32px 0;
}

a.copper-link,
.copper-link {
    display: inline-block;
    color: var(--ink);
    text-decoration: none;
    border-bottom: 1px solid var(--copper);
    padding-bottom: 2px;
    letter-spacing: 0.04em;
}

a.copper-link:hover,
a.copper-link:focus {
    color: var(--copper);
}

.btn-copper {
    display: inline-block;
    padding: 12px 30px;
    border: 1px solid var(--copper);
    color: var(--ink);
    text-decoration: none;
    letter-spacing: 0.08em;
    background: transparent;
}

.btn-copper:hover,
.btn-copper:focus {
    background: var(--copper);
    color: var(--stone);
}

/* ---------- header.stone 浅底企业导航 ---------- */

header.stone {
    position: sticky;
    top: 0;
    z-index: 60;
    background: var(--stone-raise);
    border-bottom: 1px solid var(--copper);
}

header.stone.is-scrolled {
    background: #2a231e;
}

.hdr-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 28px;
    min-height: 84px;
}

.brand {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    line-height: 1.35;
}

.brand-mark {
    font-size: 24px;
    letter-spacing: 0.16em;
}

.brand-sub {
    font-size: 12px;
    color: var(--ink-dim);
    letter-spacing: 0.05em;
}

.site-nav > ul {
    display: flex;
    align-items: center;
    gap: 30px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.site-nav > ul > li {
    position: relative;
}

.site-nav > ul > li > a {
    display: block;
    padding: 30px 0;
    color: var(--ink);
    text-decoration: none;
    font-size: 15px;
    letter-spacing: 0.06em;
    border-bottom: 1px solid transparent;
}

.site-nav > ul > li > a:hover,
.site-nav > ul > li > a:focus,
.site-nav > ul > li > a[aria-current="page"] {
    border-bottom-color: var(--copper);
    color: var(--copper);
}

.sub-menu {
    position: absolute;
    top: 100%;
    left: -18px;
    display: none;
    grid-template-columns: repeat(2, minmax(132px, 1fr));
    gap: 4px 26px;
    min-width: 320px;
    padding: 20px 24px;
    background: var(--stone-raise);
    border: 1px solid var(--copper-soft);
    border-top-color: var(--copper);
}

.has-sub:hover .sub-menu,
.has-sub:focus-within .sub-menu {
    display: grid;
}

.site-nav > ul > li:last-child .sub-menu {
    left: auto;
    right: -18px;
}

.sub-col {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sub-col a {
    color: var(--ink-dim);
    text-decoration: none;
    font-size: 13.5px;
    letter-spacing: 0.04em;
}

.sub-col a:hover,
.sub-col a:focus {
    color: var(--copper);
}

.nav-toggle {
    display: none;
    align-items: center;
    gap: 8px;
    padding: 9px 16px;
    background: transparent;
    border: 1px solid var(--copper-soft);
    color: var(--ink);
    font-size: 14px;
    letter-spacing: 0.06em;
    cursor: pointer;
}

/* ---------- HERO：满幅材质横幅 + 覆盖文字 ---------- */

.texture-hero {
    position: relative;
    border-bottom: 1px solid var(--copper-soft);
}

.texture-figure {
    position: relative;
    margin: 0;
    aspect-ratio: 3 / 1;
    max-height: 540px;
    overflow: hidden;
}

.texture-figure img {
    width: 100%;
    height: 100%;
    max-height: 540px;
    object-fit: cover;
    object-position: 50% 42%;
}

.texture-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(26, 24, 22, 0.94) 0%, rgba(26, 24, 22, 0.66) 48%, rgba(26, 24, 22, 0.2) 100%);
}

.texture-caption {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 0 32px 40px;
}

.texture-caption-inner {
    max-width: 1240px;
    margin: 0 auto;
}

.texture-tag {
    display: inline-block;
    margin-bottom: 14px;
    font-size: 12.5px;
    letter-spacing: 0.22em;
    color: var(--copper);
}

.texture-caption h1 {
    font-size: 40px;
    line-height: 1.26;
    margin: 0 0 16px;
    max-width: 860px;
}

.texture-caption p {
    max-width: 660px;
    margin: 0 0 20px;
    color: #b7b0a6;
}

/* ---------- 一 · 材质目录：粘性索引 + 满幅样张 ---------- */

.catalog-split {
    display: grid;
    grid-template-columns: 232px 1fr;
    gap: 56px;
    margin-top: 44px;
}

.catalog-index {
    position: sticky;
    top: 96px;
    align-self: start;
    border-top: 1px solid var(--copper);
    padding-top: 18px;
}

.index-title {
    font-family: var(--serif);
    font-size: 15px;
    color: var(--ink);
    letter-spacing: 0.12em;
    margin: 0 0 12px;
}

.catalog-index ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.catalog-index li {
    border-bottom: 1px solid var(--copper-soft);
}

.catalog-index li a {
    display: block;
    padding: 11px 0;
    color: var(--ink-dim);
    text-decoration: none;
    font-size: 14px;
}

.catalog-index li a:hover,
.catalog-index li a:focus {
    color: var(--copper);
}

.catalog-body {
    display: grid;
    gap: 46px;
}

.catalog-item {
    margin: 0;
}

.catalog-item img {
    width: 100%;
    aspect-ratio: 4 / 3;
    max-height: 460px;
    object-fit: cover;
    border: 1px solid var(--copper-soft);
}

.catalog-item figcaption {
    padding-top: 18px;
}

.catalog-item--card01 img {
    object-position: 50% 32%;
}

.catalog-item--card02 img {
    object-position: 50% 60%;
}

.catalog-item--hero img {
    object-position: 50% 50%;
    aspect-ratio: 16 / 9;
}

/* ---------- 二 · 场景玩法：2×2 满格大图 ---------- */

.scene-2x2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2px;
    background: var(--copper-soft);
    border: 1px solid var(--copper-soft);
    margin-top: 40px;
}

.scene-tile {
    position: relative;
    margin: 0;
    background: var(--stone-raise);
    overflow: hidden;
}

.scene-tile img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.scene-tile--a img {
    aspect-ratio: 4 / 3;
    object-position: 50% 46%;
}

.scene-tile--b img {
    aspect-ratio: 4 / 3;
    object-position: 50% 18%;
}

.scene-tile--c img {
    aspect-ratio: 16 / 9;
    object-position: 46% 55%;
}

.scene-tile--d img {
    aspect-ratio: 16 / 9;
    object-position: 50% 30%;
}

.scene-bar {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 16px 22px 14px;
    background: rgba(26, 24, 22, 0.8);
    border-top: 1px solid var(--copper-soft);
}

.scene-bar h3 {
    margin: 0 0 4px;
    font-size: 18px;
}

.scene-bar p {
    margin: 0;
    font-size: 13.5px;
    color: #a9a29a;
}

/* ---------- 三 · 品牌故事：窄栏衬线 ---------- */

.story-serif {
    max-width: 720px;
    margin: 0 auto;
    font-family: var(--serif);
    font-size: 17px;
    line-height: 2.05;
}

.story-serif p {
    color: #bdb6ac;
}

.story-serif hr {
    height: 1px;
    border: 0;
    background: var(--copper);
    margin: 30px 0;
}

/* ---------- 四 · 专题：左大图 + 右三条 ---------- */

.topic-wide-2 {
    display: grid;
    grid-template-columns: 1.35fr 1fr;
    gap: 52px;
    align-items: start;
    margin-top: 36px;
}

.topic-plate {
    margin: 0;
}

.topic-plate img {
    width: 100%;
    aspect-ratio: 12 / 5;
    max-height: 400px;
    object-fit: cover;
    object-position: 38% 50%;
    border: 1px solid var(--copper-soft);
}

.topic-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.topic-list li {
    padding: 20px 0;
    border-top: 1px solid var(--copper-soft);
}

.topic-list li:first-child {
    border-top-color: var(--copper);
}

.topic-list h3 {
    font-size: 18px;
    margin: 0 0 6px;
}

/* ---------- 五 · 资讯：三列纯文字 ---------- */

.news-cols-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 42px;
    margin-top: 36px;
}

.news-col {
    padding-left: 22px;
    border-left: 1px solid var(--copper-soft);
}

.news-col > h2 {
    font-size: 20px;
    margin: 0 0 8px;
}

.news-col > h2 a {
    color: var(--ink);
    text-decoration: none;
    border-bottom: 1px solid var(--copper);
}

.news-col > h2 a:hover,
.news-col > h2 a:focus {
    color: var(--copper);
}

.news-item {
    padding: 15px 0;
    border-top: 1px solid var(--copper-soft);
}

.news-date {
    display: block;
    font-size: 12.5px;
    color: var(--copper);
    letter-spacing: 0.14em;
    margin-bottom: 4px;
}

.news-item h3 {
    font-size: 17px;
    margin: 0 0 4px;
}

.news-item p {
    margin: 0;
    font-size: 13.5px;
}

/* ---------- 六 · 服务：三行说明 + 五条问答 ---------- */

.svc-stone {
    margin-top: 36px;
    border-top: 1px solid var(--copper);
}

.svc-row {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 36px;
    padding: 28px 0;
    border-bottom: 1px solid var(--copper-soft);
}

.svc-row h3 {
    margin: 0;
    font-size: 18px;
}

.svc-row p {
    margin: 0;
}

.svc-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 26px;
    margin-top: 28px;
}

.svc-faq {
    margin: 46px 0 0;
}

.svc-faq dt {
    font-family: var(--serif);
    font-size: 17px;
    color: var(--ink);
    padding-top: 20px;
}

.svc-faq dd {
    margin: 0;
    padding: 8px 0 20px;
    border-bottom: 1px solid var(--copper-soft);
    color: var(--ink-dim);
}

.svc-faq dt:first-child {
    padding-top: 0;
}

.svc-cta {
    margin-top: 40px;
}

/* ---------- 内页通用页头块 ---------- */

.about-stone,
.prod-stone,
.news-stone,
.contact-stone {
    padding: 66px 0 40px;
    border-bottom: 1px solid var(--copper-soft);
}

.prod-stone {
    padding-bottom: 46px;
}

.page-head-cols {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 48px;
    align-items: end;
}

.about-stone .lead,
.prod-stone .lead,
.news-stone .lead,
.contact-stone .lead {
    margin: 0;
}

.page-crumb {
    font-size: 12.5px;
    letter-spacing: 0.16em;
    color: var(--copper);
    margin: 0 0 12px;
}

/* ---------- about.html：工艺式说明 ---------- */

.about-craft {
    display: grid;
    gap: 0;
}

.craft-item {
    display: grid;
    grid-template-columns: 78px 1fr;
    gap: 30px;
    padding: 30px 0;
    border-top: 1px solid var(--copper-soft);
}

.craft-item:first-child {
    border-top-color: var(--copper);
}

.craft-idx {
    font-family: var(--serif);
    font-size: 26px;
    color: var(--copper);
    line-height: 1;
}

.craft-label {
    font-size: 12.5px;
    letter-spacing: 0.18em;
    color: var(--ink-dim);
    margin: 0 0 10px;
}

.plate-wide {
    margin: 0;
}

.plate-wide img {
    width: 100%;
    aspect-ratio: 21 / 9;
    max-height: 340px;
    object-fit: cover;
    object-position: 50% 40%;
    border-top: 1px solid var(--copper);
    border-bottom: 1px solid var(--copper-soft);
}

.plate-wide figcaption {
    padding-top: 14px;
    font-size: 13px;
    color: var(--ink-dim);
}

.about-process {
    margin: 0;
    padding: 0;
    list-style: none;
    counter-reset: step;
}

.about-process li {
    display: grid;
    grid-template-columns: 60px 1fr;
    gap: 26px;
    padding: 22px 0;
    border-bottom: 1px solid var(--copper-soft);
}

.process-idx {
    font-family: var(--serif);
    font-size: 20px;
    color: var(--copper);
}

.about-plate-sm {
    margin: 34px 0 0;
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 32px;
    align-items: center;
}

.about-plate-sm img {
    width: 100%;
    aspect-ratio: 1 / 1;
    max-height: 260px;
    object-fit: cover;
    object-position: 50% 38%;
    border: 1px solid var(--copper-soft);
}

.about-link {
    border-top: 1px solid var(--copper);
    padding-top: 26px;
}

/* ---------- product.html：目录 + 四组规格 ---------- */

.catalog-index--prod li a {
    padding: 12px 0;
}

.prod-groups {
    display: grid;
    gap: 60px;
}

.prod-group {
    border-top: 1px solid var(--copper-soft);
    padding-top: 26px;
}

.prod-head {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}

.prod-group img {
    width: 100%;
    aspect-ratio: 3 / 2;
    max-height: 320px;
    object-fit: cover;
    border: 1px solid var(--copper-soft);
}

.prod-group--b img {
    object-position: 50% 24%;
    aspect-ratio: 4 / 3;
}

.prod-group--c img {
    object-position: 50% 62%;
    aspect-ratio: 16 / 9;
}

.prod-group--d img {
    object-position: 40% 50%;
    aspect-ratio: 4 / 3;
}

.spec-dl {
    margin: 26px 0 0;
    display: grid;
    grid-template-columns: 132px 1fr;
    gap: 0 24px;
    border-top: 1px solid var(--copper-soft);
}

.spec-dl dt {
    padding: 12px 0;
    color: var(--copper);
    font-size: 13.5px;
    letter-spacing: 0.08em;
    border-bottom: 1px solid var(--copper-soft);
}

.spec-dl dd {
    margin: 0;
    padding: 12px 0;
    border-bottom: 1px solid var(--copper-soft);
    color: var(--ink-dim);
}

.prod-material-link {
    margin-top: 52px;
    padding-top: 26px;
    border-top: 1px solid var(--copper);
}

/* ---------- news.html：横幅 + 三列 ---------- */

.news-banner {
    display: grid;
    grid-template-columns: 1.25fr 1fr;
    gap: 46px;
    align-items: center;
    margin-top: 34px;
}

.news-banner img {
    width: 100%;
    aspect-ratio: 5 / 2;
    max-height: 300px;
    object-fit: cover;
    object-position: 50% 46%;
    border: 1px solid var(--copper-soft);
}

.news-banner h2 {
    font-size: 24px;
    margin: 0 0 12px;
}

.news-plate {
    margin: 46px 0 0;
}

.news-plate img {
    width: 100%;
    aspect-ratio: 12 / 5;
    max-height: 320px;
    object-fit: cover;
    object-position: 62% 50%;
    border-top: 1px solid var(--copper-soft);
    border-bottom: 1px solid var(--copper-soft);
}

.news-plate figcaption {
    padding: 12px 0 0;
    font-size: 13px;
    color: var(--ink-dim);
}

.news-time-note {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--copper);
    font-size: 13.5px;
    color: var(--ink-dim);
}

/* ---------- contact.html：说明 + 表单 + 问答 ---------- */

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.05fr;
    gap: 56px;
    align-items: start;
    margin-top: 36px;
}

.contact-notes {
    display: grid;
    gap: 0;
}

.contact-note {
    padding: 22px 0;
    border-bottom: 1px solid var(--copper-soft);
}

.contact-note:first-child {
    border-top: 1px solid var(--copper);
}

.contact-note h2 {
    font-size: 20px;
    margin: 0 0 8px;
}

.contact-note p {
    margin: 0;
    font-size: 14px;
}

.contact-form {
    background: var(--stone-raise);
    border: 1px solid var(--copper-soft);
    padding: 30px 28px;
}

.contact-form label {
    display: block;
    font-size: 13.5px;
    letter-spacing: 0.08em;
    color: var(--ink);
    margin-bottom: 6px;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    box-sizing: border-box;
    padding: 11px 12px;
    margin-bottom: 18px;
    background: #1f1b18;
    border: 1px solid var(--copper-soft);
    color: var(--ink);
    font-family: var(--sans);
    font-size: 15px;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--copper);
}

.contact-form textarea {
    min-height: 128px;
    resize: vertical;
}

.contact-form button {
    padding: 12px 32px;
    background: transparent;
    border: 1px solid var(--copper);
    color: var(--ink);
    font-family: var(--sans);
    font-size: 15px;
    letter-spacing: 0.08em;
    cursor: pointer;
}

.contact-form button:hover,
.contact-form button:focus {
    background: var(--copper);
    color: var(--stone);
}

.form-hint {
    margin: 0 0 20px;
    font-size: 13px;
    color: var(--ink-dim);
}

.form-feedback {
    margin: 16px 0 0;
    font-size: 14px;
    color: var(--copper);
    min-height: 22px;
}

.contact-plate {
    margin: 0 0 40px;
}

.contact-plate img {
    width: 100%;
    aspect-ratio: 3 / 1;
    max-height: 220px;
    object-fit: cover;
    object-position: 50% 30%;
    border: 1px solid var(--copper-soft);
}

.contact-plate--square {
    margin: 42px 0 0;
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 30px;
    align-items: center;
}

.contact-plate--square img {
    aspect-ratio: 1 / 1;
    max-height: 240px;
    object-position: 50% 44%;
}

.contact-plate--square figcaption {
    font-size: 13.5px;
    color: var(--ink-dim);
}

.contact-tail {
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--copper);
}

/* ---------- materials.html：材质专题 ---------- */

.mat-hero {
    position: relative;
    border-bottom: 1px solid var(--copper-soft);
}

.mat-hero figure {
    position: relative;
    margin: 0;
    aspect-ratio: 16 / 6;
    max-height: 420px;
    overflow: hidden;
}

.mat-hero img {
    width: 100%;
    height: 100%;
    max-height: 420px;
    object-fit: cover;
    object-position: 50% 55%;
}

.mat-hero-cap {
    position: absolute;
    inset: auto 0 0 0;
    padding: 0 32px 34px;
    background: linear-gradient(0deg, rgba(26, 24, 22, 0.88) 0%, rgba(26, 24, 22, 0) 100%);
}

.mat-hero-cap .texture-caption-inner h1 {
    font-size: 34px;
    margin: 0 0 10px;
}

.mat-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2px;
    background: var(--copper-soft);
    border: 1px solid var(--copper-soft);
    margin-top: 38px;
}

.mat-block {
    background: var(--stone-raise);
    margin: 0;
    padding: 0 0 22px;
}

.mat-block img {
    width: 100%;
    aspect-ratio: 4 / 3;
    max-height: 260px;
    object-fit: cover;
    margin-bottom: 18px;
}

.mat-block h3,
.mat-block p {
    padding: 0 22px;
}

.mat-block--b img {
    object-position: 50% 22%;
}

.mat-block--c img {
    object-position: 50% 70%;
    aspect-ratio: 1 / 1;
}

.mat-block--d img {
    object-position: 42% 50%;
    aspect-ratio: 16 / 9;
}

.mat-block--e img {
    object-position: 50% 58%;
    aspect-ratio: 5 / 4;
}

.mat-block--f img {
    object-position: 50% 34%;
    aspect-ratio: 3 / 2;
}

.mat-process {
    margin-top: 4px;
}

.mat-steps {
    display: grid;
    gap: 0;
    margin-top: 10px;
}

.mat-step {
    display: grid;
    grid-template-columns: 70px 1fr;
    gap: 28px;
    padding: 26px 0;
    border-top: 1px solid var(--copper-soft);
}

.mat-step:first-child {
    border-top-color: var(--copper);
}

.mat-step .craft-idx {
    font-size: 22px;
}

.mat-client {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 46px;
    margin-top: 12px;
}

.mat-cta {
    margin-top: 46px;
    padding-top: 28px;
    border-top: 1px solid var(--copper);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 20px 32px;
}

/* ---------- footer.stone-foot 三带式 ---------- */

footer.stone-foot {
    background: var(--stone-raise);
    border-top: 1px solid var(--copper);
    padding: 62px 0 30px;
}

.foot-top {
    padding-bottom: 30px;
    border-bottom: 1px solid var(--copper-soft);
}

.foot-brand {
    font-size: 23px;
    margin: 0 0 10px;
    letter-spacing: 0.05em;
}

.foot-line {
    margin: 0;
    max-width: 700px;
    font-size: 14px;
    color: var(--ink-dim);
}

.foot-cols {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 34px;
    padding: 34px 0;
    border-bottom: 1px solid var(--copper-soft);
}

.foot-col h4 {
    font-family: var(--serif);
    font-size: 16px;
    color: var(--copper);
    letter-spacing: 0.1em;
    margin: 0 0 14px;
}

.foot-col ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.foot-col li {
    margin-bottom: 9px;
}

.foot-col a {
    color: var(--ink-dim);
    text-decoration: none;
    font-size: 14px;
}

.foot-col a:hover,
.foot-col a:focus {
    color: var(--copper);
}

.foot-bottom {
    padding-top: 24px;
    font-size: 13px;
    color: var(--ink-dim);
}

.foot-navword {
    font-family: var(--serif);
    color: var(--ink);
    letter-spacing: 0.14em;
    margin: 0 0 6px;
}

.foot-bottom p {
    margin: 0 0 6px;
}

/* ---------- 响应式：1440 / 768 / 375 ---------- */

@media (max-width: 1080px) {
    .catalog-split {
        grid-template-columns: 200px 1fr;
        gap: 36px;
    }

    .topic-wide-2,
    .news-banner,
    .prod-head,
    .contact-grid,
    .mat-client,
    .page-head-cols,
    .contact-plate--square {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .about-plate-sm {
        grid-template-columns: 200px 1fr;
    }
}

@media (max-width: 900px) {
    .nav-toggle {
        display: inline-flex;
    }

    .site-nav {
        position: absolute;
        left: 0;
        right: 0;
        top: 100%;
        max-height: 74vh;
        overflow-y: auto;
        background: var(--stone-raise);
        border-bottom: 1px solid var(--copper);
    }

    html.js .site-nav {
        display: none;
    }

    html.js .site-nav.is-open {
        display: block;
    }

    .site-nav > ul {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 6px 32px 22px;
    }

    .site-nav > ul > li > a {
        padding: 14px 0;
        border-bottom: 1px solid var(--copper-soft);
    }

    .sub-menu,
    .site-nav > ul > li:last-child .sub-menu {
        position: static;
        display: grid;
        min-width: 0;
        left: 0;
        right: auto;
        border: 0;
        border-left: 1px solid var(--copper);
        padding: 10px 0 10px 18px;
        margin: 0 0 10px;
    }

    .has-sub:focus-within .sub-menu {
        display: grid;
    }

    .has-sub:hover .sub-menu {
        display: none;
    }

    .scene-2x2,
    .news-cols-3,
    .foot-cols,
    .mat-grid {
        grid-template-columns: 1fr;
    }

    .catalog-split {
        grid-template-columns: 1fr;
        gap: 26px;
    }

    .catalog-index {
        position: static;
    }

    .svc-row,
    .craft-item,
    .about-process li,
    .mat-step {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .texture-figure {
        aspect-ratio: 4 / 3;
        max-height: none;
    }

    .texture-caption {
        padding: 0 24px 26px;
    }

    .texture-caption h1 {
        font-size: 28px;
    }

    .wrap h1 {
        font-size: 30px;
    }

    .wrap h2 {
        font-size: 24px;
    }

    .band {
        padding: 54px 0;
    }

    .wrap {
        padding: 0 22px;
    }
}

@media (max-width: 480px) {
    .texture-caption h1 {
        font-size: 23px;
    }

    .texture-caption p {
        font-size: 14px;
    }

    .btn-copper,
    .contact-form button {
        width: 100%;
        text-align: center;
    }

    .spec-dl {
        grid-template-columns: 1fr;
    }

    .spec-dl dt {
        padding-bottom: 0;
        border-bottom: 0;
    }
}