/* ============================================================
   成都初一美学空间设计 · 官网 v3.2 宝石蓝方案（Sapphire Edition）
   基于 v3.0 框架，配色与排版精调：
   - 经典宝石蓝 Sapphire #0F52BA 作为全站唯一强调色
   - 蓝调微染的深灰底 #16181d，城市底图叠加蓝光晕
   - 排版层级放大：更大标题、更大留白、更清晰的主副关系
   - 保持框架、类名与 v3.0 完全一致，可整体替换
   ============================================================ */

:root {
  /* 字体栈 */
  --serif: 'Noto Serif SC', 'Songti SC', 'STSong', 'SimSun', serif;
  --sans: 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;

  /* 深灰蓝基调色板（Sapphire Edition） */
  --bg: #16181d;
  --bg-elevated: #1c1f26;
  --bg-soft: rgba(140, 170, 240, .05);
  --bg-strong: rgba(10, 14, 24, .30);
  --ink: #f2f1ec;
  --ink-soft: rgba(242, 241, 236, .72);
  --ink-faint: rgba(242, 241, 236, .46);
  --line: rgba(150, 178, 235, .14);
  --line-strong: rgba(150, 178, 235, .28);
  /* 宝石蓝色阶：填充用正蓝 / 文字用亮蓝 / 悬停用深蓝 */
  --accent: #7FA3E8;            /* 小字文字级宝石蓝（深底可读） */
  --accent-strong: #0F52BA;     /* 经典宝石蓝（方块、按钮、线条填充） */
  --accent-hover: #2E6FD8;      /* 悬停过渡蓝 */
  --accent-glow: rgba(15, 82, 186, .32);
  --btn-ink: #f5f7ff;           /* 蓝底按钮上的浅色文字 */
  --btn-bg: #0F52BA;            /* 按钮宝石蓝填充 */

  /* 容器 */
  --max-width: 1320px;
  --gutter: 24px;
  --header-h: 72px;

  /* 缓动 */
  --ease-out: cubic-bezier(.22, 1, .36, 1);
  color-scheme: dark;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--bg);
  min-height: 100vh;
}

/* 全站城市俯拍底图：固定、25% 透明度、灰度（保持 v3.0 口径） */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: url('../images/hero/city-01.jpg') center center / cover no-repeat;
  opacity: .25;
  filter: grayscale(100%) contrast(1.05) brightness(.92);
  transform: translateZ(0);
}

/* 宝石蓝环境光：两处低强度径向光晕，叠在底图之上、内容之下 */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(1100px 520px at 88% -10%, rgba(15, 82, 186, .26), transparent 65%),
    radial-gradient(900px 480px at -8% 108%, rgba(15, 82, 186, .16), transparent 60%);
  transform: translateZ(0);
}

/* 文本选中与滚动条的宝石蓝细节 */
::selection { background: var(--accent-strong); color: #fff; }

::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #2a3040; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-hover); }

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color .25s var(--ease-out), opacity .25s var(--ease-out); }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p { margin: 0; }

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

.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 22px;
  font-weight: 500;
}

/* eyebrow 前置宝石蓝短线 */
.eyebrow::before {
  content: '';
  width: 26px;
  height: 1px;
  background: var(--accent-strong);
  flex: none;
}

.section {
  padding: 132px 0;
  position: relative;
}

.section-title {
  font-family: var(--serif);
  font-size: clamp(32px, 4.8vw, 54px);
  font-weight: 300;
  line-height: 1.22;
  letter-spacing: .015em;
  color: var(--ink);
  margin-bottom: 24px;
}

.section-intro {
  color: var(--ink-soft);
  max-width: 640px;
  margin-bottom: 60px;
  font-size: 15.5px;
}

/* ============================================================
   导航
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  background: rgba(22, 24, 29, .88);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.site-header .nav {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--ink);
  display: inline-flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand small {
  font-family: var(--sans);
  font-size: 9px;
  letter-spacing: .16em;
  color: var(--ink-faint);
  font-weight: 400;
  text-transform: uppercase;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  font-size: 14px;
  color: var(--ink-soft);
  letter-spacing: .04em;
  position: relative;
  padding: 6px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width .35s var(--ease-out);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--ink);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-links .nav-cta {
  background: var(--btn-bg);
  color: var(--btn-ink);
  padding: 9px 18px;
  border-radius: 2px;
  font-weight: 500;
  font-size: 13px;
  letter-spacing: .08em;
}

.nav-links .nav-cta::after { display: none; }
.nav-links .nav-cta:hover { background: var(--accent-hover); color: #fff; }

.nav-phone {
  font-family: var(--serif);
  font-size: 15px;
  color: var(--ink);
  letter-spacing: .04em;
  padding: 6px 0;
  border-bottom: 1px solid transparent;
}

.nav-phone:hover { border-bottom-color: var(--accent); color: var(--accent); }

.nav-toggle {
  display: none;
  width: 28px;
  height: 22px;
  position: relative;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--ink);
  transition: transform .3s var(--ease-out), opacity .3s var(--ease-out);
}

.nav-toggle span:nth-child(1) { top: 0; }
.nav-toggle span:nth-child(2) { top: 10px; }
.nav-toggle span:nth-child(3) { top: 20px; }

.nav-toggle.open span:nth-child(1) { transform: translateY(10px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-10px) rotate(-45deg); }

/* ============================================================
   按钮
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 13px;
  letter-spacing: .12em;
  border-radius: 2px;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  transition: transform .25s var(--ease-out), background .25s var(--ease-out), border-color .25s var(--ease-out), color .25s var(--ease-out);
}

.btn:hover {
  background: var(--accent-hover);
  color: #fff;
  border-color: var(--accent-hover);
  transform: translateY(-2px);
}

.btn-lg { padding: 16px 34px; font-size: 14px; }

.btn-on-hero {
  background: var(--btn-bg);
  color: var(--btn-ink);
  border-color: var(--btn-bg);
  box-shadow: 0 14px 40px var(--accent-glow);
}

.btn-on-hero:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: #fff; }

.btn-outline-on-hero {
  background: transparent;
  color: var(--ink);
  border-color: rgba(150, 178, 235, .45);
}

.btn-outline-on-hero:hover {
  background: rgba(15, 82, 186, .16);
  border-color: var(--accent);
  color: var(--ink);
}

/* ============================================================
   首页 Hero
   ============================================================ */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: flex-end;
  padding: calc(var(--header-h) + 80px) 0 96px;
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-media::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(22,24,29,.94) 0%, rgba(22,24,29,.55) 55%, rgba(20,26,42,.72) 100%),
    linear-gradient(0deg, rgba(22,24,29,.9) 0%, rgba(22,24,29,.25) 50%, rgba(20,26,42,.5) 100%);
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(100%) contrast(1.05);
  opacity: .25;
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 48px;
}

.hero-kicker {
  font-size: 14px;
  letter-spacing: .2em;
  color: var(--accent);
  margin-bottom: 20px;
  text-transform: uppercase;
}

.hero h1 {
  font-family: var(--serif);
  font-size: clamp(44px, 7vw, 100px);
  font-weight: 300;
  line-height: 1.08;
  letter-spacing: .01em;
  color: var(--ink);
  margin-bottom: 32px;
  max-width: 1200px;
}

/* 第二行副标题：缩小至主标题的 60%，宝石蓝渐变字 */
.hero h1 .h1-sub {
  display: block;
  font-size: .75em;
  font-weight: 300;
  letter-spacing: .075em;
  margin-top: 14px;
  background: linear-gradient(115deg, #c9d8f6 8%, var(--accent) 55%, #3E78D8 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--accent);
}

.hero-sub {
  color: var(--ink-soft);
  font-size: 16px;
  max-width: 560px;
  margin-bottom: 40px;
  line-height: 1.85;
}

.hero-sub-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 560px;
  margin-bottom: 44px;
  padding: 0;
  list-style: none;
}

.hero-sub-list li {
  display: flex;
  align-items: baseline;
  gap: 16px;
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--ink-soft);
}

/* 条目前的方块符号（宝石蓝） */
.hero-sub-list li::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  background: var(--accent-strong);
  box-shadow: 0 0 10px var(--accent-glow);
  transform: translateY(-1px);
  flex: none;
}

.hero-sub-list strong {
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: .04em;
  min-width: 5em;
}

.hero-sub-list span {
  color: var(--ink-soft);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
}

.hero-contact-inline {
  margin-left: 12px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hero-contact-inline .label {
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--ink-faint);
}

.hero-contact-inline span:last-child {
  font-family: var(--serif);
  font-size: 18px;
  letter-spacing: .04em;
  color: var(--ink);
}

.hero-right {
  text-align: right;
  padding-bottom: 12px;
}

.hero-right .label {
  display: block;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--ink-faint);
  margin-bottom: 8px;
}

.hero-right .phone {
  font-family: var(--serif);
  font-size: clamp(22px, 2.6vw, 34px);
  font-weight: 300;
  letter-spacing: .04em;
  color: var(--ink);
}

/* ============================================================
   联系方式速览条
   ============================================================ */
.contact-strip {
  position: relative;
  z-index: 2;
  background: var(--bg-strong);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.contact-strip-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.contact-strip-item {
  padding: 32px 28px;
  border-right: 1px solid var(--line);
  transition: background .3s var(--ease-out);
}

.contact-strip-item:last-child { border-right: none; }
.contact-strip-item:hover { background: rgba(15, 82, 186, .10); }
.contact-strip-item:hover .cs-value { color: var(--accent); }

.cs-label {
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--ink-faint);
  margin-bottom: 8px;
  text-transform: uppercase;
}

.cs-value {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 300;
  color: var(--ink);
  margin-bottom: 6px;
  letter-spacing: .02em;
}

.cs-sub {
  font-size: 13px;
  color: var(--ink-faint);
  line-height: 1.6;
}

/* ============================================================
   作品网格
   ============================================================ */
.works-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.works-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.work-card {
  display: block;
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  overflow: hidden;
  transition: transform .35s var(--ease-out), border-color .35s var(--ease-out), box-shadow .35s var(--ease-out);
}

.work-card:hover {
  transform: translateY(-6px);
  border-color: rgba(127, 163, 232, .45);
  box-shadow: 0 24px 60px rgba(0, 0, 0, .4), 0 0 0 1px rgba(15, 82, 186, .18), 0 12px 44px rgba(15, 82, 186, .14);
}

.work-thumb {
  position: relative;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  background: var(--bg-strong);
}

.work-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 6s var(--ease-out);
}

.work-card:hover .work-thumb img { transform: scale(1.06); }

.work-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  color: var(--ink-faint);
  font-size: 13px;
  letter-spacing: .08em;
  background:
    linear-gradient(45deg, transparent 48%, rgba(255,255,255,.03) 50%, transparent 52%),
    var(--bg-strong);
  background-size: 20px 20px, auto;
}

.work-meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 22px 24px 8px;
}

.work-meta h3 {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: .02em;
}

.work-type {
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--accent);
  border: 1px solid rgba(127, 163, 232, .35);
  padding: 3px 10px;
  white-space: nowrap;
}

.work-info {
  padding: 0 24px 24px;
  font-size: 13px;
  color: var(--ink-faint);
  letter-spacing: .04em;
}

/* ============================================================
   关于 / 双栏
   ============================================================ */
.about-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  align-items: center;
}

.about-text p {
  color: var(--ink-soft);
  margin-bottom: 18px;
  font-size: 15.5px;
  line-height: 1.85;
}

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

.about-media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--bg-strong);
}

.about-media::after {
  content: '';
  display: block;
  padding-top: 66.66%;
}

.about-media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(20%) contrast(1.05);
}

/* ============================================================
   设计原则
   ============================================================ */
.value-list {
  display: grid;
  gap: 36px;
}

.value-item {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 32px;
  padding-bottom: 36px;
  border-bottom: 1px solid var(--line);
}

.value-item:last-child { border-bottom: none; padding-bottom: 0; }

.v-num {
  font-family: var(--serif);
  font-size: 36px;
  font-weight: 300;
  color: var(--accent);
  line-height: 1;
  opacity: .7;
}

.value-item h3 {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 400;
  margin-bottom: 10px;
  letter-spacing: .02em;
}

.value-item p {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.8;
  max-width: 680px;
}

/* ============================================================
   底部大 CTA
   ============================================================ */
.big-cta {
  position: relative;
  padding: 120px 0;
  text-align: center;
  background: var(--bg-strong);
  border-top: 1px solid var(--line);
  overflow: hidden;
}

.big-cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('../images/hero/hero-01.jpg') center center / cover no-repeat;
  opacity: .12;
  filter: grayscale(100%);
  z-index: 0;
}

/* 底部 CTA 的宝石蓝聚光 */
.big-cta::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(760px 420px at 50% 118%, rgba(15, 82, 186, .30), transparent 68%);
  pointer-events: none;
  z-index: 0;
}

.big-cta .container { position: relative; z-index: 1; }

.big-cta h2 {
  font-family: var(--serif);
  font-size: clamp(30px, 4.4vw, 52px);
  font-weight: 300;
  line-height: 1.22;
  letter-spacing: .02em;
  margin-bottom: 22px;
  color: var(--ink);
}

.big-cta > .container > p:not(.eyebrow) {
  color: var(--ink-soft);
  max-width: 560px;
  margin: 0 auto 38px;
  font-size: 15.5px;
}

.btn-wrap {
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 18px;
  margin-bottom: 42px;
}

.phone-big {
  font-family: var(--serif);
  font-size: clamp(18px, 2.2vw, 26px);
  letter-spacing: .04em;
  color: var(--ink);
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  background: var(--bg-elevated);
  border-top: 1px solid var(--line);
  padding: 72px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 56px;
}

.footer-brand .brand { margin-bottom: 18px; }
.footer-brand > p:last-child {
  color: var(--ink-faint);
  font-size: 14px;
  line-height: 1.7;
  max-width: 280px;
}

.footer-col h4 {
  font-family: var(--serif);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .1em;
  margin-bottom: 20px;
  color: var(--ink);
}

.footer-col a,
.footer-col p {
  display: block;
  color: var(--ink-soft);
  font-size: 13.5px;
  margin-bottom: 10px;
  line-height: 1.55;
  font-weight: 400;
}

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

/* 服务列主分类加粗（覆盖在 footer-col p/a 之上） */
.footer-col .fs-cat {
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .04em;
  margin-top: 10px;
  margin-bottom: 4px;
}
.footer-col .fs-cat:first-child { margin-top: 0; }
.footer-col .fs-sub {
  color: var(--ink-faint);
  font-size: 12.5px;
  font-weight: 400;
  letter-spacing: .03em;
  margin-bottom: 14px;
}

/* 关于区列表式表述（小方块前缀） */
.about-list {
  list-style: none;
  padding-left: 0;
  margin: 14px 0 22px;
}
.about-list li {
  position: relative;
  padding-left: 18px;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.9;
  letter-spacing: 0.02em;
}
.about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 7px;
  height: 7px;
  background: var(--accent);
  border-radius: 1px;
}

/* 孤字防御：尽量避免中文单字断行 */
body {
  word-break: keep-all;
  overflow-wrap: break-word;
  text-wrap: pretty;
}

/* 页脚关键串强制整行（公众号长名） */
.footer-col > p,
.footer-brand > p { word-break: keep-all; }

/* footer 长链接整行（公众号长名等） */
.footer-col > p.no-break,
.footer-brand > p.no-break { white-space: nowrap; }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--ink-faint);
  letter-spacing: .04em;
}

/* ============================================================
   内页通用 Hero
   ============================================================ */
.page-hero {
  position: relative;
  padding: calc(var(--header-h) + 84px) 0 84px;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(22,24,29,.82) 0%, rgba(22,26,40,.62) 100%),
    url('../images/hero/city-01.jpg') center center / cover no-repeat;
  opacity: .25;
  filter: grayscale(100%);
  z-index: 0;
}

.page-hero .container { position: relative; z-index: 1; }

.page-hero h1 {
  font-family: var(--serif);
  font-size: clamp(34px, 5vw, 58px);
  font-weight: 300;
  letter-spacing: .02em;
  margin-bottom: 20px;
}

.page-hero p {
  color: var(--ink-soft);
  max-width: 640px;
  font-size: 16px;
  line-height: 1.8;
}

.service-lead {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  border: 1px solid var(--line);
  margin-top: 48px;
  background: var(--line);
}

.service-lead-item {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: 32px 28px;
  background: rgba(255, 255, 255, .02);
  transition: background .3s var(--ease-out);
}

.service-lead-item:hover { background: rgba(15, 82, 186, .10); }

.service-lead-item .num {
  font-family: var(--serif);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--accent);
  padding-top: 2px;
}

.service-lead-item strong {
  display: block;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 400;
  color: var(--ink);
  margin-bottom: 8px;
  letter-spacing: .04em;
}

.service-lead-item span {
  display: block;
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.7;
}

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

/* ============================================================
   作品筛选
   ============================================================ */
.filter-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 44px;
  flex-wrap: wrap;
}

.filter-btn {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink-soft);
  padding: 10px 22px;
  font-size: 13px;
  letter-spacing: .1em;
  cursor: pointer;
  border-radius: 2px;
  transition: all .25s var(--ease-out);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--ink);
  color: var(--btn-ink);
  border-color: var(--ink);
}

.work-card[data-hidden="true"] { display: none; }

/* ============================================================
   服务流程时间轴
   ============================================================ */
.timeline {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.tl-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 40px;
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
}

.tl-step {
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--accent);
  text-transform: uppercase;
  padding-top: 4px;
}

.tl-content h3 {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 400;
  margin-bottom: 10px;
  letter-spacing: .02em;
}

.tl-content p {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.8;
  max-width: 720px;
}

/* ============================================================
   装标统计
   ============================================================ */
.stat-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.stat-item {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  padding: 36px 30px;
  transition: border-color .3s var(--ease-out);
}

.stat-item:hover { border-color: var(--line-strong); }

.stat-num {
  font-family: var(--serif);
  font-size: clamp(34px, 4vw, 50px);
  font-weight: 300;
  color: var(--ink);
  margin-bottom: 10px;
  letter-spacing: .02em;
}

.stat-unit {
  font-size: 15px;
  color: var(--accent);
  margin-bottom: 8px;
  letter-spacing: .04em;
}

.stat-desc {
  font-size: 13px;
  color: var(--ink-faint);
  line-height: 1.65;
}

/* ============================================================
   联系页
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.contact-item {
  padding: 32px 26px;
  border-right: 1px solid var(--line);
  background: var(--bg-soft);
  transition: background .3s var(--ease-out);
}

.contact-item:last-child { border-right: none; }
.contact-item:hover { background: rgba(15, 82, 186, .10); }

.c-label {
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--ink-faint);
  margin-bottom: 10px;
  text-transform: uppercase;
}

.c-value {
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 300;
  color: var(--ink);
  margin-bottom: 8px;
  letter-spacing: .02em;
}

.c-sub {
  font-size: 13px;
  color: var(--ink-faint);
  line-height: 1.6;
}

.inquiry-form {
  display: grid;
  gap: 20px;
}

.inquiry-form input,
.inquiry-form textarea {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
  font-family: var(--sans);
  font-size: 15px;
  color: var(--ink);
  outline: none;
  transition: border-color .25s var(--ease-out);
  resize: vertical;
}

.inquiry-form input::placeholder,
.inquiry-form textarea::placeholder {
  color: var(--ink-faint);
}

.inquiry-form input:focus,
.inquiry-form textarea:focus {
  border-bottom-color: var(--accent);
}

.form-hint {
  display: none;
  margin-top: 14px;
  color: var(--accent);
  font-size: 14px;
  line-height: 1.7;
}

/* ============================================================
   案例详情页
   ============================================================ */
.case-head {
  max-width: 860px;
}

.back-link {
  display: inline-block;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--ink-faint);
  margin-bottom: 22px;
  border-bottom: 1px solid transparent;
}

.back-link:hover { color: var(--accent); border-bottom-color: var(--accent); }

.case-head h1 {
  font-family: var(--serif);
  font-size: clamp(30px, 4vw, 48px);
  font-weight: 300;
  letter-spacing: .02em;
  margin-bottom: 14px;
}

.case-meta {
  color: var(--ink-soft);
  font-size: 15px;
  letter-spacing: .04em;
}

.case-facts {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-bottom: 52px;
}

.fact .f-label {
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--ink-faint);
  margin-bottom: 8px;
  text-transform: uppercase;
}

.fact .f-value {
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: .02em;
}

.case-body-text {
  max-width: 720px;
  margin-bottom: 64px;
}

.case-body-text h2 {
  font-family: var(--serif);
  font-size: 26px;
  font-weight: 300;
  margin-bottom: 24px;
  letter-spacing: .02em;
}

.case-body-text p {
  color: var(--ink-soft);
  font-size: 15.5px;
  line-height: 1.85;
  margin-bottom: 18px;
}

.case-gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 64px;
}

.gallery-item {
  aspect-ratio: 3 / 2;
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-faint);
  font-size: 13px;
  letter-spacing: .08em;
  overflow: hidden;
}

.gallery-item.wide {
  grid-column: 1 / -1;
  aspect-ratio: 16 / 9;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 6s var(--ease-out);
}

.gallery-item:hover img { transform: scale(1.04); }

.case-nav {
  display: flex;
  justify-content: space-between;
  padding-top: 36px;
  border-top: 1px solid var(--line);
}

.case-nav a {
  font-size: 14px;
  letter-spacing: .08em;
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

.case-nav a:hover { color: var(--accent); border-bottom-color: var(--accent); }

/* ============================================================
   404
   ============================================================ */
.notfound {
  min-height: calc(100svh - var(--header-h) - 100px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 80px 24px;
}

.notfound .code {
  font-family: var(--serif);
  font-size: clamp(80px, 14vw, 160px);
  font-weight: 300;
  line-height: 1;
  color: var(--ink-faint);
  margin-bottom: 24px;
  letter-spacing: .06em;
}

.notfound h1 {
  font-family: var(--serif);
  font-size: clamp(26px, 3.5vw, 38px);
  font-weight: 300;
  margin-bottom: 14px;
}

.notfound p {
  color: var(--ink-soft);
  margin-bottom: 34px;
  font-size: 15px;
}

/* ============================================================
   入场淡入
   ============================================================ */
.hero-inner,
.page-hero .container,
.section > .container,
.big-cta .container {
  opacity: 0;
  transform: translateY(18px);
  animation: fadeUp .9s var(--ease-out) forwards;
}

.page-hero .container { animation-delay: .05s; }
.section > .container { animation-delay: .1s; }
.big-cta .container { animation-delay: .05s; }

@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .nav-links {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(22, 24, 29, .96);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 32px var(--gutter);
    transform: translateX(100%);
    opacity: 0;
    pointer-events: none;
    transition: transform .35s var(--ease-out), opacity .35s var(--ease-out);
  }

  .nav-links.open {
    transform: translateX(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-links a {
    font-size: 22px;
    padding: 16px 0;
    border-bottom: 1px solid var(--line);
    width: 100%;
  }

  .nav-links .nav-cta {
    margin-top: 16px;
    align-self: flex-start;
    text-align: center;
  }

  .nav-phone { display: none; }
  .nav-toggle { display: block; }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .hero-right { text-align: left; }
  .hero-contact-inline { margin-left: 0; margin-top: 8px; }

  .contact-strip-inner,
  .contact-grid { grid-template-columns: 1fr 1fr; }
  .contact-strip-item,
  .contact-item { border-right: none; border-bottom: 1px solid var(--line); }
  .contact-strip-item:nth-child(odd),
  .contact-item:nth-child(odd) { border-right: 1px solid var(--line); }
  .contact-strip-item:nth-last-child(-n+2),
  .contact-item:nth-last-child(-n+2) { border-bottom: none; }

  .works-grid,
  .works-grid-3 { grid-template-columns: 1fr 1fr; }

  .about-split { grid-template-columns: 1fr; gap: 48px; }

  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px 24px; }

  .case-facts { grid-template-columns: repeat(3, 1fr); }
  .stat-strip { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  :root { --gutter: 16px; }

  .section { padding: 72px 0; }
  .big-cta { padding: 80px 0; }

  .hero {
    padding: calc(var(--header-h) + 36px) 0 44px;
    min-height: 100svh;
  }

  .hero h1 { font-size: clamp(32px, 10vw, 46px); }
  .hero-sub { font-size: 14.5px; }
  .hero-sub-list { gap: 12px; }
  .hero-sub-list li { flex-direction: row; flex-wrap: wrap; align-items: baseline; gap: 8px; }
  .hero-sub-list li::before { transform: translateY(0); }
  .hero-sub-list strong { min-width: auto; }
  .hero-actions { flex-direction: column; align-items: flex-start; gap: 16px; }

  .contact-strip-inner,
  .contact-grid { grid-template-columns: 1fr; }
  .contact-strip-item,
  .contact-item { border-right: none; border-bottom: 1px solid var(--line); }
  .contact-strip-item:last-child,
  .contact-item:last-child { border-bottom: none; }

  .works-grid,
  .works-grid-3 { grid-template-columns: 1fr; gap: 24px; }

  .work-meta { flex-direction: column; align-items: flex-start; gap: 8px; }

  .value-item { grid-template-columns: 56px 1fr; gap: 18px; }
  .v-num { font-size: 28px; }

  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }

  .case-facts { grid-template-columns: 1fr 1fr; gap: 16px; }
  .case-gallery { grid-template-columns: 1fr; gap: 16px; }
  .case-nav { flex-direction: column; gap: 16px; }
}

/* ===== 二维码组件（v4+）===== */
.qr-box {
  --qr-size: 132px;
  --qr-pad: 14px;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  padding: var(--qr-pad);
  background: rgba(20, 22, 24, 0.55);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(15, 82, 186, 0.22);
  border-radius: 12px;
  position: relative;
  text-decoration: none;
  color: inherit;
  transition: transform .35s cubic-bezier(.2,.7,.2,1), border-color .3s ease, background .3s ease;
}
.qr-box:hover,
.qr-box:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(15, 82, 186, 0.55);
  background: rgba(20, 22, 24, 0.75);
}
.qr-box::before,
.qr-box::after,
.qr-box > .qr-corner-tl,
.qr-box > .qr-corner-br {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: 1.5px solid var(--accent);
}
.qr-box::before {
  top: -1px; left: -1px;
  border-right: 0; border-bottom: 0;
}
.qr-box::after {
  bottom: -1px; right: -1px;
  border-left: 0; border-top: 0;
}

.qr-img-wrap {
  width: var(--qr-size);
  height: var(--qr-size);
  padding: 6px;
  background: #ffffff;
  border-radius: 6px;
  box-shadow: 0 0 0 1px rgba(255,255,255,.04), 0 6px 24px rgba(15, 82, 186, 0.18);
}
.qr-img-wrap img {
  display: block;
  width: 100%;
  height: 100%;
  image-rendering: pixelated;
  image-rendering: -moz-crisp-edges;
  image-rendering: crisp-edges;
}

.qr-caption {
  margin-top: 12px;
  font-family: var(--serif);
  font-size: 13px;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: .12em;
  text-align: center;
}
.qr-caption .qr-en {
  display: block;
  margin-top: 2px;
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 500;
  color: var(--ink-faint);
  letter-spacing: .22em;
  text-transform: uppercase;
}
.qr-tip {
  margin-top: 6px;
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: .04em;
  text-align: center;
  line-height: 1.55;
}

/* hero 浮岛 */
.qr-float {
  position: absolute;
  right: 32px;
  bottom: 36px;
  z-index: 4;
  animation: qr-breath 6s ease-in-out infinite;
}
@keyframes qr-breath {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-4px); }
}
@media (max-width: 880px) {
  .qr-float { display: none; }
}

/* footer 中版本（紧凑） */
.footer-col .qr-box {
  --qr-size: 108px;
  --qr-pad: 10px;
  margin-top: 18px;
}
.footer-col .qr-caption { font-size: 12px; }
.footer-col .qr-tip { font-size: 10.5px; }

/* contact CTA 大码 */
.cta-with-qr {
  display: grid;
  grid-template-columns: 1.4fr .8fr;
  gap: 80px;
  align-items: center;
  max-width: 1080px;
  margin: 0 auto;
  padding: 80px 64px;
  border: 1px solid rgba(15, 82, 186, 0.22);
  border-radius: 18px;
  background: rgba(15, 82, 186, 0.05);
}
.cta-with-qr .qr-box { --qr-size: 196px; --qr-pad: 18px; }
.cta-with-qr .qr-caption { font-size: 15px; }
.cta-with-qr .qr-tip { font-size: 12.5px; }
@media (max-width: 880px) {
  .cta-with-qr { grid-template-columns: 1fr; gap: 36px; padding: 48px 28px; text-align: center; }
  .cta-with-qr .qr-box { --qr-size: 156px; }
}

/* contact-strip 中二维码版本 */
.contact-strip-item.qr-strip-item {
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  text-decoration: none;
}
.contact-strip-item.qr-strip-item .qr-img-wrap.qr-img-strip {
  display: inline-block;
  width: 104px;
  height: 104px;
  padding: 5px;
  background: #fff;
  border-radius: 6px;
  margin: 4px 0 6px;
  box-shadow: 0 0 0 1px rgba(15,82,186,.25), 0 6px 18px rgba(15,82,186,.16);
}
.contact-strip-item.qr-strip-item .qr-img-wrap.qr-img-strip img {
  display: block;
  width: 100%;
  height: 100%;
  image-rendering: pixelated;
}
.qr-strip-sub { line-height: 1.55; }
@media (max-width: 880px) {
  .contact-strip-item.qr-strip-item .qr-img-wrap.qr-img-strip {
    width: 92px; height: 92px;
  }
}

/* 移动端二维码适配：放大保留 */
@media (max-width: 480px) {
  .qr-box { --qr-size: 148px; --qr-pad: 12px; }
  .footer-col .qr-box { --qr-size: 128px; }
}

  .tl-row { grid-template-columns: 1fr; gap: 10px; padding: 26px 0; }
  .tl-step { padding-top: 0; }
}