/* ============================================================
   深度灵感 DEEP INSPIRATION
   高端宝石珠宝品牌官网 全站样式
   色板：米白 / 暖灰 / 炭灰，唯一强调色：青金石蓝
   圆角制度：全站直角（radius 0）
   ============================================================ */

:root {
  --bg: #F4F1EC;          /* 米白 */
  --bg-alt: #E9E4DB;      /* 暖灰 */
  --ink: #2B2926;         /* 炭灰 */
  --ink-soft: #6B665E;    /* 次要文字，对米白背景 >= 4.5:1 */
  --accent: #31496E;      /* 青金石蓝，全站唯一强调色 */
  --accent-ink: #F4F1EC;  /* 强调色上的文字 */
  --line: #D9D3C7;        /* 发丝线 */
  --scrim: 24, 22, 20;    /* Hero 压暗层基色 */

  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-latin: "Cormorant Garamond", "Georgia", "Times New Roman", serif;

  --nav-h: 72px;
  --section-gap: clamp(6rem, 11vw, 10rem);
  --container-pad: clamp(1.25rem, 4.5vw, 4.5rem);

  /* z-index 层级约定：导航 40 / 移动菜单 50 */
  color-scheme: light;
}

/* ---------- 基础 ---------- */

*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.9;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

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

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: 0.02em;
  margin: 0;
}

p { margin: 0; }

figure { margin: 0; }

.container {
  max-width: 1400px;
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.latin {
  font-family: var(--font-latin);
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

/* ---------- 导航 ---------- */

.site-nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 40;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  transition: background 0.45s ease, border-color 0.45s ease;
}

.site-nav .container {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  white-space: nowrap;
}

.brand-zh {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.28em;
}

.brand-en {
  font-family: var(--font-latin);
  font-size: 0.68rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--ink-soft);
  transform: translateY(-1px);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(1.2rem, 2.4vw, 2.4rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-links a {
  font-size: 0.92rem;
  letter-spacing: 0.12em;
  padding: 0.4rem 0;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, color 0.3s ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  border-bottom-color: currentColor;
}

.nav-links a[aria-current="page"] {
  border-bottom-color: var(--accent);
  color: var(--accent);
}

/* Hero 页导航：初始透明白字，滚过 Hero 后回到实底 */
.site-nav.nav-overlay {
  background: transparent;
  border-bottom-color: transparent;
  color: #F6F4EF;
}

.site-nav.nav-overlay .brand-en { color: rgba(246, 244, 239, 0.75); }

.site-nav.nav-overlay .nav-links a[aria-current="page"] {
  color: inherit;
  border-bottom-color: currentColor;
}

.site-nav.nav-overlay.is-solid {
  background: var(--bg);
  border-bottom-color: var(--line);
  color: var(--ink);
}

.site-nav.nav-overlay.is-solid .brand-en { color: var(--ink-soft); }

.site-nav.nav-overlay.is-solid .nav-links a[aria-current="page"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* 移动端汉堡 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 7px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: none;
  border: 0;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 1px;
  width: 100%;
  background: currentColor;
  transition: transform 0.35s ease, opacity 0.35s ease;
}

.nav-toggle[aria-expanded="true"] span:first-child { transform: translateY(4px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:last-child { transform: translateY(-4px) rotate(-45deg); }

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

  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    z-index: 50;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    padding: 0.5rem var(--container-pad) 1.5rem;
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.35s ease, opacity 0.35s ease, visibility 0.35s;
    color: var(--ink);
  }

  .nav-links.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-links li { width: 100%; }

  .nav-links a {
    display: block;
    padding: 0.9rem 0;
    font-size: 1.05rem;
    border-bottom: 1px solid var(--line);
  }
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-block;
  padding: 0.95rem 2.4rem;
  font-family: var(--font-body);
  font-size: 0.92rem;
  letter-spacing: 0.18em;
  white-space: nowrap;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), background 0.3s ease, color 0.3s ease;
}

.btn:active { transform: scale(0.98); }

.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
}

.btn-primary:hover { background: #263A59; }

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

.btn-outline:hover {
  background: var(--ink);
  color: var(--bg);
}

/* Hero 视频上的按钮：米白实底保证对比 */
.btn-hero {
  background: #F4F1EC;
  color: #2B2926;
}

.btn-hero:hover { background: #FFFFFF; }

/* ---------- Hero（全屏视频） ---------- */

.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  color: #F6F4EF;
}

.hero-media {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(
      to bottom,
      rgba(var(--scrim), 0.42) 0%,
      rgba(var(--scrim), 0) 22%
    ),
    linear-gradient(
      to top,
      rgba(var(--scrim), 0.72) 0%,
      rgba(var(--scrim), 0.32) 42%,
      rgba(var(--scrim), 0.12) 100%
    );
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 0 var(--container-pad) clamp(3.5rem, 9vh, 6.5rem);
  max-width: 46rem;
}

.hero-title {
  font-size: clamp(2.1rem, 4.6vw, 3.7rem);
  font-weight: 500;
  line-height: 1.4;
  color: #F6F4EF;
}

.hero-sub {
  margin-top: 1.4rem;
  font-size: clamp(0.98rem, 1.4vw, 1.1rem);
  letter-spacing: 0.06em;
  color: rgba(246, 244, 239, 0.88);
}

.hero-cta { margin-top: 2.4rem; }

/* ---------- 通用 Section ---------- */

.section { padding-block: var(--section-gap); }

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

.section-head {
  max-width: 40rem;
  margin-bottom: clamp(3rem, 6vw, 5rem);
}

.section-title {
  font-size: clamp(1.7rem, 3vw, 2.5rem);
}

.section-desc {
  margin-top: 1.2rem;
  color: var(--ink-soft);
  max-width: 34rem;
}

/* ---------- 系列收藏（横向 scroll-snap） ---------- */

.collection-track {
  display: flex;
  gap: clamp(1.25rem, 2.5vw, 2.5rem);
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scroll-padding-inline: var(--container-pad);
  padding-inline: var(--container-pad);
  padding-bottom: 1.5rem;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

.collection-track > * {
  scroll-snap-align: start;
  flex: 0 0 clamp(240px, 26vw, 360px);
}

/* 不等宽节奏：第 2、5 张更宽 */
.collection-track > :nth-child(2),
.collection-track > :nth-child(5) {
  flex-basis: clamp(300px, 34vw, 460px);
}

.collection-card { display: block; }

.collection-card .frame {
  aspect-ratio: 3 / 4;
  overflow: hidden;
  background: var(--bg-alt);
}

.collection-card:nth-child(even) .frame { aspect-ratio: 4 / 5; }

.collection-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.collection-card:hover img { transform: scale(1.04); }

.collection-card figcaption {
  margin-top: 1.1rem;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.collection-card .name {
  font-family: var(--font-display);
  font-size: 1.12rem;
  letter-spacing: 0.06em;
}

.collection-card .count {
  font-family: var(--font-latin);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
}

/* ---------- 编辑式非对称网格（12 栏） ---------- */

.grid-editorial {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: clamp(1.25rem, 3vw, 3rem);
  row-gap: clamp(3rem, 6vw, 5rem);
  align-items: start;
}

.span-3 { grid-column: auto / span 3; }
.span-4 { grid-column: auto / span 4; }
.span-5 { grid-column: auto / span 5; }
.span-6 { grid-column: auto / span 6; }
.span-7 { grid-column: auto / span 7; }
.span-8 { grid-column: auto / span 8; }

.push-1 { margin-top: clamp(2rem, 5vw, 4.5rem); }
.push-2 { margin-top: clamp(4rem, 9vw, 8rem); }
.start-2 { grid-column-start: 2; }
.start-7 { grid-column-start: 7; }
.start-8 { grid-column-start: 8; }

@media (max-width: 767px) {
  .grid-editorial { display: block; }
  .grid-editorial > * { margin-top: 3rem; }
  .grid-editorial > :first-child { margin-top: 0; }
}

/* ---------- 产品卡片 ---------- */

.product-card { display: block; }

.product-card .frame {
  overflow: hidden;
  background: var(--bg-alt);
}

.product-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.product-card:hover img { transform: scale(1.03); }

.product-card figcaption { margin-top: 1.1rem; }

.product-card .name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.05em;
  border-bottom: 1px solid transparent;
  display: inline-block;
  transition: border-color 0.3s ease;
}

.product-card:hover .name { border-bottom-color: var(--ink); }

.product-card .material {
  margin-top: 0.35rem;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
}

.product-card .price {
  margin-top: 0.5rem;
  font-family: var(--font-latin);
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  color: var(--accent);
}

/* 画幅比例工具类 */
.ratio-34 { aspect-ratio: 3 / 4; }
.ratio-45 { aspect-ratio: 4 / 5; }
.ratio-11 { aspect-ratio: 1 / 1; }
.ratio-43 { aspect-ratio: 4 / 3; }
.ratio-169 { aspect-ratio: 16 / 9; }

/* ---------- 宝石材质条 ---------- */

.stone-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: clamp(1rem, 2vw, 2rem);
}

.stone-grid figure { text-align: left; }

.stone-grid .frame {
  aspect-ratio: 3 / 4;
  overflow: hidden;
}

.stone-grid img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.stone-grid figure:hover img { transform: scale(1.05); }

.stone-grid figcaption {
  margin-top: 0.8rem;
  font-size: 0.9rem;
  letter-spacing: 0.1em;
}

.stone-grid .stone-en {
  display: block;
  font-family: var(--font-latin);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--ink-soft);
}

@media (max-width: 900px) {
  .stone-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 560px) {
  .stone-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- 50/50 分屏 ---------- */

.split {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  min-height: 78vh;
}

.split-media { overflow: hidden; }

.split-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.split-body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(3rem, 7vw, 6.5rem);
}

.split-body .section-title { max-width: 22ch; }

.split-body p {
  margin-top: 1.5rem;
  max-width: 30rem;
  color: var(--ink-soft);
}

.split-body .btn { margin-top: 2.5rem; align-self: flex-start; }

@media (max-width: 860px) {
  .split { grid-template-columns: 1fr; min-height: 0; }
  .split-media { aspect-ratio: 4 / 3; }
}

/* ---------- 宣言 ---------- */

.manifesto { padding-block: var(--section-gap); }

.manifesto-inner {
  padding-left: clamp(0rem, 16vw, 16rem);
  max-width: 72rem;
  margin-inline: auto;
  padding-right: var(--container-pad);
}

.manifesto-text {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.4vw, 2.7rem);
  line-height: 1.75;
  font-weight: 500;
}

.manifesto-text em {
  font-style: normal;
  color: var(--accent);
}

.manifesto-sign {
  margin-top: 2.2rem;
  font-family: var(--font-latin);
  font-size: 0.85rem;
  letter-spacing: 0.26em;
  color: var(--ink-soft);
  text-transform: uppercase;
}

@media (max-width: 767px) {
  .manifesto-inner { padding-left: var(--container-pad); }
}

/* ---------- 内页页头 ---------- */

.page-head {
  padding-top: calc(var(--nav-h) + clamp(4rem, 9vw, 7.5rem));
  padding-bottom: clamp(3rem, 6vw, 5rem);
}

.page-head .kicker {
  font-family: var(--font-latin);
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.page-head h1 {
  margin-top: 1rem;
  font-size: clamp(2.2rem, 4.6vw, 3.6rem);
}

.page-head .lede {
  margin-top: 1.4rem;
  max-width: 36rem;
  color: var(--ink-soft);
}

/* 分类锚点标签 */
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1rem;
  margin-top: 2.4rem;
}

.tag-row a {
  padding: 0.45rem 1.15rem;
  border: 1px solid var(--line);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  transition: border-color 0.3s ease, color 0.3s ease;
}

.tag-row a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ---------- 品牌故事长文 ---------- */

.prose {
  max-width: 42rem;
}

.prose h2 {
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
  margin-bottom: 1.4rem;
}

.prose p {
  margin-bottom: 1.4rem;
  color: var(--ink-soft);
}

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

.full-bleed { overflow: hidden; }

.full-bleed img {
  width: 100%;
  height: clamp(320px, 62vh, 620px);
  object-fit: cover;
}

/* ---------- 表单 ---------- */

.form-grid {
  display: grid;
  gap: 1.6rem;
}

.field { display: grid; gap: 0.5rem; }

.field label {
  font-size: 0.9rem;
  letter-spacing: 0.08em;
}

.field .hint {
  font-size: 0.8rem;
  color: var(--ink-soft);
}

.field input,
.field textarea {
  font: inherit;
  color: var(--ink);
  background: #FDFCFA;
  border: 1px solid #A59E90;
  padding: 0.85rem 1rem;
  border-radius: 0;
  width: 100%;
}

.field input:focus-visible,
.field textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}

.field textarea { min-height: 9rem; resize: vertical; }

.field .error {
  display: none;
  font-size: 0.82rem;
  color: #8C3A2E;
}

.field.is-invalid input,
.field.is-invalid textarea { border-color: #8C3A2E; }

.field.is-invalid .error { display: block; }

.form-done {
  display: none;
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 1rem 1.2rem;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
}

.form-done.is-visible { display: block; }

/* ---------- 联系页信息列 ---------- */

.contact-layout {
  display: grid;
  grid-template-columns: 5fr 6fr;
  gap: clamp(3rem, 7vw, 7rem);
  align-items: start;
}

.contact-info h2 { font-size: clamp(1.6rem, 2.8vw, 2.3rem); }

.contact-list {
  margin: 2.5rem 0 0;
  display: grid;
  gap: 1.8rem;
}

.contact-list div dt {
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  color: var(--ink-soft);
  margin-bottom: 0.3rem;
}

.contact-list div dd {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: 0.03em;
}

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

@media (max-width: 860px) {
  .contact-layout { grid-template-columns: 1fr; }
}

/* ---------- 页脚 ---------- */

.site-footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--line);
  padding-top: clamp(3.5rem, 7vw, 5.5rem);
}

.footer-cols {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  padding-bottom: clamp(3rem, 6vw, 4.5rem);
}

.footer-brand .brand-zh { font-size: 1.25rem; }

.footer-brand p {
  margin-top: 1.2rem;
  max-width: 22rem;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.footer-col h3 {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--ink-soft);
  margin-bottom: 1.2rem;
}

.footer-col ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.7rem;
}

.footer-col a,
.footer-col li {
  font-size: 0.95rem;
  letter-spacing: 0.04em;
}

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

.footer-bar {
  border-top: 1px solid var(--line);
  padding-block: 1.4rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem 2rem;
  font-size: 0.82rem;
  color: var(--ink-soft);
}

.footer-bar a {
  letter-spacing: 0.04em;
  border-bottom: 1px solid transparent;
  transition: color 0.3s ease, border-color 0.3s ease;
}

.footer-bar a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

@media (max-width: 900px) {
  .footer-cols { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 560px) {
  .footer-cols { grid-template-columns: 1fr; }
}

/* ---------- 入场动效（克制：一次性 reveal） ---------- */

@media (prefers-reduced-motion: no-preference) {
  .js .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition:
      opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
      transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
    transition-delay: calc(var(--i, 0) * 90ms);
  }

  .js .reveal.is-visible {
    opacity: 1;
    transform: none;
  }

  .js .hero-content > * {
    opacity: 0;
    transform: translateY(20px);
    animation: hero-in 0.9s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  }

  .js .hero-content > :nth-child(2) { animation-delay: 0.15s; }
  .js .hero-content > :nth-child(3) { animation-delay: 0.3s; }

  @keyframes hero-in {
    to { opacity: 1; transform: none; }
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ---------- 焦点可见性 ---------- */

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.site-nav.nav-overlay:not(.is-solid) a:focus-visible,
.site-nav.nav-overlay:not(.is-solid) button:focus-visible {
  outline-color: #F6F4EF;
}