/* ==========================================================================
   河南清网信息技术服务有限公司 — 官网样式
   设计语言：墨蓝 × 玉青 × 暖纸色 · 中式编辑风
   ========================================================================== */

/* ---------- 变量与基础 ---------- */
:root {
  --ink: #0c1b26;          /* 墨蓝（主深色） */
  --ink-2: #10222f;
  --ink-3: #16303f;
  --paper: #f6f4ee;        /* 暖纸色（主浅色） */
  --paper-2: #efece3;
  --jade: #0e8a72;         /* 玉青（主强调） */
  --jade-bright: #14b392;  /* 深色背景上的亮玉青 */
  --jade-soft: rgba(14, 138, 114, .1);
  --gold: #b9975b;
  --text: #1d2b33;
  --muted: #5d6b71;
  --line: rgba(12, 27, 38, .14);
  --line-dark: rgba(233, 239, 236, .14);
  --serif: "Noto Serif SC", "Songti SC", "STZhongsong", "SimSun", serif;
  --sans: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --wrap: 1180px;
  --radius: 14px;
  --shadow: 0 20px 50px -18px rgba(12, 27, 38, .25);
  --ease: cubic-bezier(.22, .61, .2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--paper);
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font: inherit; border: 0; background: none; cursor: pointer; }
i, em { font-style: normal; }

::selection { background: var(--jade); color: #fff; }

::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--paper-2); }
::-webkit-scrollbar-thumb { background: #c4bfae; border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: var(--jade); }

.wrap { width: min(var(--wrap), 92vw); margin-inline: auto; }

/* ---------- 通用区块头 ---------- */
.section { padding: clamp(72px, 9vw, 120px) 0; position: relative; }

.sec-head { margin-bottom: clamp(36px, 5vw, 64px); }

.sec-eyebrow {
  display: flex; align-items: center; gap: 10px;
  font-size: 12px; letter-spacing: .28em;
  color: var(--jade); font-weight: 600;
  margin-bottom: 14px; text-transform: uppercase;
}
.sec-eyebrow i { width: 34px; height: 1px; background: currentColor; opacity: .7; }
.sec-eyebrow i.r { margin-left: 2px; }

.sec-title {
  font-family: var(--serif);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink);
  letter-spacing: .04em;
}
.sec-title em {
  color: var(--jade);
  background-image: linear-gradient(transparent 68%, var(--jade-soft) 68%);
}
.sec-head-center { text-align: center; }
.sec-head-center .sec-eyebrow { justify-content: center; }
.sec-lead { color: var(--muted); margin-top: 12px; }
.sec-head-light .sec-title { color: #e9efec; }
.sec-head-light .sec-eyebrow { color: var(--jade-bright); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 26px; border-radius: 999px;
  font-size: 15px; font-weight: 600; letter-spacing: .06em;
  border: 1px solid transparent;
  transition: all .3s var(--ease);
  white-space: nowrap;
}
.btn-lg { padding: 15px 34px; font-size: 16px; }
.btn-block { width: 100%; }

.btn-solid { background: var(--jade); color: #fff; box-shadow: 0 10px 24px -10px rgba(14,138,114,.55); }
.btn-solid:hover { background: #0b6f5c; transform: translateY(-2px); }

.btn-ghost { border-color: rgba(12,27,38,.3); color: var(--ink); }
.btn-ghost:hover { border-color: var(--jade); color: var(--jade); background: var(--jade-soft); }

.btn-line { border-color: rgba(12,27,38,.3); color: var(--ink); }
.btn-line:hover { border-color: var(--jade); color: var(--jade); }

.btn-line-dark { border-color: rgba(12,27,38,.35); color: var(--ink); }
.btn-line-dark:hover { border-color: var(--jade); color: var(--jade); }

/* ---------- 顶部导航 ---------- */
.topbar {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  transition: background .35s var(--ease), box-shadow .35s var(--ease), backdrop-filter .35s;
}
.topbar.is-stuck {
  background: rgba(12, 27, 38, .88);
  backdrop-filter: blur(14px) saturate(1.3);
  box-shadow: 0 6px 30px -12px rgba(0, 0, 0, .4);
}
.topbar-inner {
  display: flex; align-items: center; gap: 28px;
  height: 76px;
}

.brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand-mark { width: 42px; height: 42px; transition: transform .5s var(--ease); }
.brand:hover .brand-mark { transform: rotate(90deg); }
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-text strong {
  font-family: var(--serif); font-size: 21px; font-weight: 700;
  letter-spacing: .18em; color: var(--ink);
}
.brand-text small { font-size: 10px; letter-spacing: .32em; color: var(--jade-bright); }

.nav { display: flex; gap: 4px; margin-left: auto; }
.nav-link {
  position: relative; padding: 8px 14px;
  font-size: 15px; color: rgba(12,27,38,.72);
  letter-spacing: .08em; transition: color .3s;
}
.nav-link::after {
  content: ""; position: absolute; left: 14px; right: 14px; bottom: 2px;
  height: 2px; background: var(--jade-bright);
  transform: scaleX(0); transform-origin: left;
  transition: transform .35s var(--ease);
}
.nav-link:hover { color: var(--ink); }
.nav-link.is-active { color: var(--jade); }
.nav-link.is-active::after, .nav-link:hover::after { transform: scaleX(1); }

/* 滚动后：深色底 + 浅色文字 */
.topbar.is-stuck .brand-text strong { color: #fff; }
.topbar.is-stuck .nav-link { color: rgba(255,255,255,.82); }
.topbar.is-stuck .nav-link:hover { color: #fff; }
.topbar.is-stuck .nav-link.is-active { color: var(--jade-bright); }
.topbar.is-stuck .nav-link.is-active::after, .topbar.is-stuck .nav-link:hover::after { transform: scaleX(1); }
.topbar.is-stuck .btn-line { border-color: rgba(255,255,255,.35); color: #e9efec; }
.topbar.is-stuck .btn-line:hover { border-color: var(--jade-bright); color: var(--jade-bright); }
.topbar.is-stuck .nav-toggle span { background: #fff; }

.topbar-cta { display: flex; gap: 12px; }

.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 10px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--ink); transition: all .3s var(--ease); }
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 首屏 ---------- */
.hero {
  position: relative; min-height: 100vh; min-height: 100svh;
  display: flex; align-items: center;
  background:
    radial-gradient(1100px 500px at 85% -10%, rgba(20, 179, 146, .12), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, rgba(14, 138, 114, .1), transparent 55%),
    var(--paper);
  overflow: hidden;
}
.hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-grid {
  position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: .45;
  mask-image: radial-gradient(900px 600px at 70% 40%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(900px 600px at 70% 40%, #000 30%, transparent 75%);
}
.hero-vertical {
  position: absolute; right: clamp(16px, 4vw, 56px); top: 50%;
  transform: translateY(-50%);
  writing-mode: vertical-rl; letter-spacing: .5em;
  font-size: 13px; color: rgba(12, 27, 38, .4);
  border-right: 1px solid rgba(12, 27, 38, .25); padding-right: 14px;
  user-select: none;
}
.hero-inner { position: relative; padding: 140px 0 90px; max-width: 860px; }

.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 12px; letter-spacing: .3em; color: var(--jade); font-weight: 600;
  border: 1px solid rgba(14, 138, 114, .35); border-radius: 999px;
  padding: 7px 18px; background: rgba(255, 255, 255, .5);
}
.hero-eyebrow .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--jade); box-shadow: 0 0 0 4px rgba(14,138,114,.18);
  animation: pulse 2.4s infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(14,138,114,.18); }
  50% { box-shadow: 0 0 0 8px rgba(14,138,114,.06); }
}

.hero-title {
  font-family: var(--serif);
  font-size: clamp(40px, 7.2vw, 84px);
  font-weight: 900; line-height: 1.18;
  color: var(--ink); letter-spacing: .06em;
  margin: 26px 0 22px;
}
.hero-title .accent { color: var(--jade); }

.hero-sub { font-size: clamp(16px, 1.6vw, 19px); color: var(--muted); max-width: 620px; }
.hero-sub em {
  color: var(--ink); font-weight: 700;
  border-bottom: 2px solid var(--jade);
  padding-bottom: 1px;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 40px; }

.hero-stats {
  display: flex; flex-wrap: wrap; gap: clamp(28px, 5vw, 64px);
  margin-top: clamp(48px, 7vw, 80px);
  padding-top: 34px; border-top: 1px solid var(--line);
}
.hero-stats li { display: flex; flex-direction: column; }
.hero-stats strong {
  font-family: var(--serif);
  font-size: clamp(30px, 3.6vw, 44px);
  font-weight: 700; color: var(--ink); line-height: 1.1;
  font-variant-numeric: tabular-nums;
}
.hero-stats strong::after {
  content: attr(data-suffix); color: var(--jade); margin-left: 2px;
}
.hero-stats span { font-size: 13px; letter-spacing: .2em; color: var(--muted); margin-top: 6px; }

.hero-scroll {
  position: absolute; left: 50%; bottom: 26px; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  font-size: 10px; letter-spacing: .4em; color: var(--muted);
}
.hero-scroll-line {
  width: 1px; height: 44px; background: var(--line);
  position: relative; overflow: hidden;
}
.hero-scroll-line::after {
  content: ""; position: absolute; top: -50%; left: 0;
  width: 100%; height: 50%; background: var(--jade);
  animation: scrollDrop 2s var(--ease) infinite;
}
@keyframes scrollDrop { to { top: 110%; } }

/* ---------- 关于我们 ---------- */
.about { background: linear-gradient(var(--paper) 0%, var(--paper-2) 100%); }
.about-inner {
  display: grid; grid-template-columns: 1.15fr .85fr;
  gap: clamp(40px, 6vw, 90px); align-items: center;
}
.about-copy p { color: var(--muted); margin-bottom: 18px; }
.about-copy p strong { color: var(--ink); }
.about-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 10px 0 30px; }
.about-tags li {
  font-size: 13px; letter-spacing: .1em; color: var(--ink);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 6px 16px; background: rgba(255,255,255,.55);
}

.about-visual {
  position: relative; min-height: 380px;
  color: var(--jade);
}
.about-deco {
  position: absolute; inset: 0; margin: auto; width: 100%;
  animation: spin 40s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.about-card {
  position: absolute;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 28px; box-shadow: var(--shadow);
  transition: transform .4s var(--ease);
}
.about-card:hover { transform: translateY(-6px) rotate(0deg) !important; }
.about-card .num {
  font-family: var(--serif); font-size: 34px; font-weight: 700;
  color: var(--ink); line-height: 1.15;
}
.about-card p:last-child { font-size: 13px; color: var(--muted); letter-spacing: .06em; }
.about-card-a { top: 4%; left: 6%; transform: rotate(-4deg); }
.about-card-a .num { color: var(--jade); }
.about-card-b { top: 38%; right: 2%; transform: rotate(3deg); }
.about-card-c { bottom: 2%; left: 18%; transform: rotate(-2deg); }

/* ---------- 业务体系（深色） ---------- */
.services {
  background:
    radial-gradient(900px 460px at 90% 0%, rgba(20, 179, 146, .1), transparent 60%),
    linear-gradient(160deg, var(--ink) 0%, var(--ink-2) 100%);
  color: #e9efec;
}
.services .sec-title { color: #e9efec; }
.services .sec-title em { color: var(--jade-bright); background-image: linear-gradient(transparent 68%, rgba(20,179,146,.18) 68%); }
.services .sec-lead { color: rgba(233,239,236,.6); }

.services-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 1px; background: var(--line-dark);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius); overflow: hidden;
}
.service-card {
  position: relative;
  background: var(--ink-2);
  padding: 40px 34px 34px;
  transition: background .4s var(--ease);
  overflow: hidden;
}
.service-card::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(400px 200px at 20% 0%, rgba(20,179,146,.14), transparent 70%);
  opacity: 0; transition: opacity .4s;
}
.service-card:hover { background: var(--ink-3); }
.service-card:hover::before { opacity: 1; }
.service-no {
  font-family: var(--serif); font-size: 15px; font-weight: 600;
  color: var(--jade-bright); letter-spacing: .2em;
  display: flex; align-items: center; gap: 10px; margin-bottom: 18px;
}
.service-no::after { content: ""; width: 26px; height: 1px; background: currentColor; opacity: .5; }
.service-card h3 {
  font-family: var(--serif); font-size: 21px; font-weight: 700;
  letter-spacing: .06em; margin-bottom: 12px; position: relative;
}
.service-card p {
  font-size: 14.5px; color: rgba(233,239,236,.66);
  line-height: 1.85; position: relative;
}
.service-more {
  display: inline-block; margin-top: 20px;
  font-size: 12px; letter-spacing: .12em;
  color: var(--jade-bright); opacity: .8;
}

/* ---------- 服务优势 ---------- */
.adv-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 26px;
}
.adv-item {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 34px 26px;
  transition: transform .35s var(--ease), box-shadow .35s var(--ease), border-color .35s;
}
.adv-item:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow);
  border-color: rgba(14,138,114,.4);
}
.adv-ico {
  display: inline-flex; width: 54px; height: 54px; border-radius: 14px;
  background: var(--jade-soft); color: var(--jade);
  align-items: center; justify-content: center; margin-bottom: 20px;
}
.adv-ico svg { width: 28px; height: 28px; fill: currentColor; }
.adv-item h3 {
  font-family: var(--serif); font-size: 19px; color: var(--ink);
  letter-spacing: .08em; margin-bottom: 10px;
}
.adv-item p { font-size: 14px; color: var(--muted); }

/* ---------- 合作流程 ---------- */
.process { background: var(--paper-2); }
.process-list {
  display: grid; grid-template-columns: repeat(6, 1fr); gap: 20px;
  counter-reset: step;
}
.process-list li { position: relative; text-align: left; padding-top: 18px; }
.process-list li::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0;
  height: 1px; background: var(--line);
}
.process-list li::after {
  content: ""; position: absolute; top: -3px; left: 0;
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--jade);
  box-shadow: 0 0 0 4px var(--paper-2);
}
.p-no {
  font-family: var(--serif); font-size: 30px; font-weight: 700;
  color: rgba(12,27,38,.18); display: block; line-height: 1.2;
  transition: color .3s;
}
.process-list li:hover .p-no { color: var(--jade); }
.process-list h3 {
  font-family: var(--serif); font-size: 17px; color: var(--ink);
  letter-spacing: .1em; margin: 4px 0 6px;
}
.process-list p { font-size: 13px; color: var(--muted); }

/* ---------- 经典案例 ---------- */
.cases-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }
.case-card {
  display: flex; gap: 24px; align-items: flex-start;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; transition: transform .35s var(--ease), box-shadow .35s var(--ease);
}
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }

.case-cover {
  flex: 0 0 96px; height: 96px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  color: rgba(255,255,255,.9);
}
.case-cover svg { width: 56px; height: 56px; }
.case-cover-1 { background: linear-gradient(135deg, #0e8a72, #0a5c4e); }
.case-cover-2 { background: linear-gradient(135deg, #16303f, #0c1b26); }
.case-cover-3 { background: linear-gradient(135deg, #b9975b, #8a6c35); }
.case-cover-4 { background: linear-gradient(135deg, #0e8a72, #16303f); }

.case-body h3 {
  font-family: var(--serif); font-size: 19px; color: var(--ink);
  letter-spacing: .05em; margin: 8px 0 8px;
}
.case-body p { font-size: 14px; color: var(--muted); }
.case-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.case-tags span {
  font-size: 11.5px; letter-spacing: .1em; color: var(--jade);
  background: var(--jade-soft); border-radius: 999px; padding: 3px 12px;
}

/* ---------- 新闻动态 ---------- */
.news { background: linear-gradient(var(--paper) 0%, var(--paper-2) 100%); }
.news-list { border-top: 1px solid var(--line); }
.news-item {
  display: grid; grid-template-columns: 110px 1fr auto; gap: 26px; align-items: center;
  padding: 30px 10px; border-bottom: 1px solid var(--line);
  transition: background .3s, padding .3s var(--ease);
}
.news-item:hover { background: rgba(255,255,255,.65); padding-left: 22px; padding-right: 22px; }
.news-date { text-align: left; line-height: 1.2; }
.news-date b {
  font-family: var(--serif); font-size: 38px; font-weight: 700; color: var(--ink);
  display: block; font-variant-numeric: tabular-nums;
}
.news-date span { font-size: 12px; letter-spacing: .16em; color: var(--muted); }
.news-text h3 {
  font-family: var(--serif); font-size: 19px; font-weight: 700;
  color: var(--ink); letter-spacing: .04em; margin-bottom: 6px;
  transition: color .3s;
}
.news-item:hover .news-text h3 { color: var(--jade); }
.news-text p { font-size: 14px; color: var(--muted); }
.news-arrow {
  font-size: 20px; color: var(--muted);
  transition: transform .3s var(--ease), color .3s;
}
.news-item:hover .news-arrow { transform: translateX(6px); color: var(--jade); }

/* ---------- 联系我们（深色） ---------- */
.contact {
  background:
    radial-gradient(800px 420px at 10% 10%, rgba(20,179,146,.1), transparent 60%),
    linear-gradient(160deg, var(--ink-2), var(--ink));
  color: #e9efec;
}
.contact-inner {
  display: grid; grid-template-columns: 1.05fr .95fr;
  gap: clamp(44px, 6vw, 90px); align-items: start;
}
.contact-lead { color: rgba(233,239,236,.65); margin-bottom: 36px; }

.contact-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.contact-cards li { display: flex; gap: 14px; }
.c-ico {
  flex: 0 0 44px; width: 44px; height: 44px; border-radius: 12px;
  background: rgba(20,179,146,.14); color: var(--jade-bright);
  display: flex; align-items: center; justify-content: center;
}
.c-ico svg { width: 22px; height: 22px; fill: currentColor; }
.contact-cards h4 {
  font-size: 13px; letter-spacing: .2em; color: rgba(233,239,236,.55);
  font-weight: 600; margin-bottom: 4px;
}
.contact-cards p { font-size: 15px; line-height: 1.7; }
.contact-cards a:hover { color: var(--jade-bright); }

.contact-form {
  background: rgba(255,255,255,.045);
  border: 1px solid var(--line-dark); border-radius: var(--radius);
  padding: clamp(26px, 4vw, 40px);
  backdrop-filter: blur(6px);
}
.contact-form label { display: block; margin-bottom: 20px; }
.contact-form label span {
  display: flex; gap: 4px; font-size: 13px; letter-spacing: .16em;
  color: rgba(233,239,236,.65); margin-bottom: 8px;
}
.contact-form label i { color: var(--jade-bright); }
.contact-form input, .contact-form select, .contact-form textarea {
  width: 100%; font: inherit; color: #fff;
  background: rgba(12,27,38,.5);
  border: 1px solid var(--line-dark); border-radius: 10px;
  padding: 13px 16px; outline: none;
  transition: border-color .3s, box-shadow .3s;
}
.contact-form select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--jade-bright) 50%), linear-gradient(135deg, var(--jade-bright) 50%, transparent 50%); background-position: calc(100% - 22px) 55%, calc(100% - 16px) 55%; background-size: 6px 6px; background-repeat: no-repeat; }
.contact-form select option { color: #1d2b33; background: #fff; }
.contact-form textarea { resize: vertical; min-height: 120px; }
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus {
  border-color: var(--jade-bright);
  box-shadow: 0 0 0 4px rgba(20,179,146,.15);
}
.contact-form input.is-invalid { border-color: #e05d5d; box-shadow: 0 0 0 4px rgba(224,93,93,.12); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-tip { font-size: 12px; color: rgba(233,239,236,.45); text-align: center; margin-top: 14px; letter-spacing: .05em; }

/* ---------- 页脚 ---------- */
.footer { background: #08131b; color: rgba(233,239,236,.72); }
.footer-inner {
  display: grid; grid-template-columns: 1.4fr .8fr .9fr 1fr;
  gap: 40px; padding: clamp(48px, 6vw, 72px) 0 44px;
}
.brand-light .brand-text strong { color: #fff; }
.footer-brand p { font-size: 14px; line-height: 2; margin-top: 18px; color: rgba(233,239,236,.5); }
.footer h5 {
  font-size: 13px; letter-spacing: .26em; color: #fff;
  margin-bottom: 18px; font-weight: 600;
}
.footer-nav a {
  display: block; font-size: 14px; padding: 5px 0;
  color: rgba(233,239,236,.6); transition: color .3s, transform .3s var(--ease);
}
.footer-nav a:hover { color: var(--jade-bright); transform: translateX(4px); }
.footer-services span {
  display: block; font-size: 14px; padding: 5px 0; color: rgba(233,239,236,.6);
}
.footer-contact p { font-size: 14px; padding: 5px 0; color: rgba(233,239,236,.6); }
.footer-contact a:hover { color: var(--jade-bright); }

.footer-bar { border-top: 1px solid rgba(233,239,236,.1); }
.footer-bar-inner {
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap;
  gap: 8px; padding: 20px 0; font-size: 13px; color: rgba(233,239,236,.45);
}
.icp a { transition: color .3s; letter-spacing: .04em; }
.icp a:hover { color: var(--jade-bright); }

/* ---------- 回到顶部 / Toast ---------- */
.backtop {
  position: fixed; right: 26px; bottom: 26px; z-index: 90;
  width: 46px; height: 46px; border-radius: 50%;
  background: var(--ink); color: #fff;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 10px 26px -8px rgba(12,27,38,.5);
  opacity: 0; visibility: hidden; transform: translateY(14px);
  transition: all .35s var(--ease);
}
.backtop svg { width: 20px; height: 20px; fill: currentColor; }
.backtop.is-show { opacity: 1; visibility: visible; transform: none; }
.backtop:hover { background: var(--jade); }

.toast {
  position: fixed; left: 50%; bottom: 40px; z-index: 120;
  transform: translate(-50%, 20px);
  background: var(--ink); color: #fff;
  border: 1px solid rgba(20,179,146,.4); border-radius: 10px;
  padding: 13px 26px; font-size: 14px; letter-spacing: .05em;
  box-shadow: 0 16px 40px -10px rgba(0,0,0,.45);
  opacity: 0; visibility: hidden;
  transition: all .4s var(--ease);
}
.toast.is-show { opacity: 1; visibility: visible; transform: translate(-50%, 0); }
.toast::before {
  content: "✓"; color: var(--jade-bright); font-weight: 700; margin-right: 8px;
}

/* ---------- 入场动效 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .8s var(--ease), transform .8s var(--ease); }
.reveal[data-delay="1"] { transition-delay: .1s; }
.reveal[data-delay="2"] { transition-delay: .2s; }
.reveal[data-delay="3"] { transition-delay: .3s; }
.reveal[data-delay="4"] { transition-delay: .4s; }
.reveal[data-delay="5"] { transition-delay: .5s; }
.reveal.is-in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .process-list { grid-template-columns: repeat(3, 1fr); row-gap: 34px; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .hero-vertical { display: none; }
}

@media (max-width: 860px) {
  .topbar-cta .btn-line { display: none; }
  .nav {
    position: fixed; top: 76px; left: 0; right: 0; z-index: 99;
    flex-direction: column; gap: 0;
    background: rgba(12,27,38,.97); backdrop-filter: blur(14px);
    padding: 10px 6vw 22px;
    transform: translateY(-12px); opacity: 0; visibility: hidden;
    transition: all .35s var(--ease);
    box-shadow: 0 30px 50px -20px rgba(0,0,0,.5);
  }
  .nav.is-open { transform: none; opacity: 1; visibility: visible; }
  .topbar .nav-link { color: rgba(255,255,255,.85); border-bottom: 1px solid rgba(233,239,236,.08); }
  .topbar .nav-link:hover { color: #fff; }
  .topbar .nav-link.is-active { color: var(--jade-bright); }
  .nav-link { padding: 13px 0; font-size: 16px; }
  .nav-link::after { display: none; }
  .nav-toggle { display: flex; margin-left: auto; }
  .topbar-cta { margin-left: 0; }
  .topbar-inner { gap: 14px; }

  .about-inner, .contact-inner { grid-template-columns: 1fr; }
  .cases-grid { grid-template-columns: 1fr; }
  .hero-inner { padding: 130px 0 90px; }
}

@media (max-width: 640px) {
  html { scroll-padding-top: 70px; }
  .nav { top: 64px; }
  .topbar-inner { height: 64px; }
  .brand-text strong { font-size: 18px; }
  .brand-text small { font-size: 9px; }
  .topbar-cta .btn-solid { display: none; }
  .services-grid, .adv-grid, .form-row, .contact-cards { grid-template-columns: 1fr; }
  .process-list { grid-template-columns: repeat(2, 1fr); }
  .news-item { grid-template-columns: 74px 1fr; }
  .news-date b { font-size: 28px; }
  .news-arrow { display: none; }
  .case-card { flex-direction: column; }
  .hero-stats { gap: 22px; }
  .hero-stats li { flex: 1 1 38%; }
  .footer-inner { grid-template-columns: 1fr; gap: 30px; }
  .footer-bar-inner { justify-content: center; text-align: center; }
  .about-visual { min-height: 330px; }
  .backtop { right: 16px; bottom: 16px; }
}

/* ---------- 降低动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}