/* ==========================================================
   上海夕恬网络科技有限公司 - 官网共享样式
   水墨风格 · 简约大气
   ========================================================== */

:root {
  --ink-black: #1a1a1a;      /* 浓墨 */
  --ink-dark: #2b2b2b;       /* 重墨 */
  --ink-mid: #55565a;        /* 中墨 */
  --ink-light: #8a8c92;      /* 淡墨 */
  --ink-wash: #f5f4f0;       /* 宣纸底色 */
  --paper: #fdfcfa;          /* 纸白 */
  --seal-red: #b03a2e;       /* 印章朱红 */
  --seal-red-deep: #8e2f26;
  --gold: #b8935a;           /* 描金 */
  --line: #e6e3dc;           /* 分割线 */
  --radius: 4px;
  --serif: "Noto Serif SC", "Source Han Serif SC", "STZhongsong", "SimSun", serif;
  --sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  color: var(--ink-dark);
  background: var(--paper);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; transition: color .25s; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

.container { width: min(1200px, 92%); margin: 0 auto; }

/* ---------- 顶部导航 ---------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(253, 252, 250, .92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: box-shadow .3s, border-color .3s;
}
.navbar.scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 2px 24px rgba(26, 26, 26, .06);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-seal {
  width: 42px; height: 42px;
  background: var(--seal-red);
  color: #fff;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  border-radius: 6px;
  letter-spacing: 1px;
  box-shadow: 0 4px 12px rgba(176, 58, 46, .3);
}
.brand-name { display: flex; flex-direction: column; line-height: 1.25; }
.brand-name .cn { font-family: var(--serif); font-size: 19px; font-weight: 700; color: var(--ink-black); letter-spacing: 2px; }
.brand-name .en { font-size: 10px; color: var(--ink-light); letter-spacing: 1.5px; text-transform: uppercase; }

.nav-links { display: flex; align-items: center; gap: 40px; }
.nav-links a {
  font-size: 15px;
  color: var(--ink-mid);
  padding: 6px 0;
  position: relative;
  letter-spacing: 1px;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 50%; bottom: -2px;
  width: 0; height: 2px;
  background: var(--seal-red);
  transition: all .3s;
}
.nav-links a:hover, .nav-links a.active { color: var(--ink-black); }
.nav-links a:hover::after, .nav-links a.active::after { left: 0; width: 100%; }

.nav-cta {
  display: inline-block;
  padding: 9px 26px;
  border: 1px solid var(--ink-black);
  color: var(--ink-black);
  font-size: 14px;
  letter-spacing: 2px;
  transition: all .3s;
}
.nav-cta:hover { background: var(--ink-black); color: #fff; }

.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 6px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--ink-black); transition: .3s; }

/* ---------- 通用板块 ---------- */
.section { padding: 100px 0; }
.section.gray { background: var(--ink-wash); }

.sec-head { text-align: center; max-width: 720px; margin: 0 auto 64px; }
.sec-eyebrow {
  display: inline-flex; align-items: center; gap: 12px;
  font-family: var(--serif);
  color: var(--seal-red);
  font-size: 14px;
  letter-spacing: 4px;
  margin-bottom: 14px;
}
.sec-eyebrow::before, .sec-eyebrow::after {
  content: "";
  width: 36px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--seal-red));
}
.sec-eyebrow::after { background: linear-gradient(90deg, var(--seal-red), transparent); }
.sec-title { font-family: var(--serif); font-size: 36px; color: var(--ink-black); letter-spacing: 3px; margin-bottom: 16px; }
.sec-desc { color: var(--ink-light); font-size: 15px; }

/* 滚动显现 */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .8s ease, transform .8s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background:
    radial-gradient(ellipse 60% 45% at 78% 18%, rgba(176,58,46,.05), transparent 70%),
    linear-gradient(180deg, #fdfcfa 0%, #f7f5f0 55%, #eeece4 100%);
  overflow: hidden;
}
.hero-ink { position: absolute; inset: 0; pointer-events: none; }
.hero-content { position: relative; z-index: 2; padding-top: 72px; }
.hero-tag {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 13px; letter-spacing: 4px;
  color: var(--seal-red);
  border: 1px solid rgba(176,58,46,.35);
  padding: 7px 18px;
  margin-bottom: 30px;
  background: rgba(253,252,250,.6);
}
.hero-title {
  font-family: var(--serif);
  font-size: clamp(38px, 5.5vw, 64px);
  color: var(--ink-black);
  letter-spacing: 6px;
  line-height: 1.35;
  margin-bottom: 26px;
}
.hero-title em { font-style: normal; color: var(--seal-red); }
.hero-sub {
  font-size: 17px;
  color: var(--ink-mid);
  max-width: 560px;
  letter-spacing: 1px;
  margin-bottom: 44px;
}
.hero-actions { display: flex; gap: 18px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 14px 38px;
  font-size: 15px;
  letter-spacing: 3px;
  transition: all .3s;
  border-radius: var(--radius);
}
.btn-primary { background: var(--ink-black); color: #fff; }
.btn-primary:hover { background: var(--seal-red); box-shadow: 0 8px 24px rgba(176,58,46,.28); transform: translateY(-2px); }
.btn-ghost { border: 1px solid var(--ink-light); color: var(--ink-dark); background: rgba(253,252,250,.5); }
.btn-ghost:hover { border-color: var(--ink-black); background: #fff; transform: translateY(-2px); }

.hero-seal-mark {
  position: absolute;
  right: 8%; top: 24%;
  width: 128px; height: 128px;
  border: 3px solid rgba(176,58,46,.75);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif);
  font-size: 44px; font-weight: 700;
  color: rgba(176,58,46,.8);
  letter-spacing: 4px;
  transform: rotate(6deg);
  z-index: 2;
  writing-mode: vertical-rl;
  background: rgba(176,58,46,.04);
}
.hero-seal-mark::after {
  content: "";
  position: absolute; inset: 6px;
  border: 1px solid rgba(176,58,46,.4);
  border-radius: 6px;
}

.hero-stats {
  position: relative; z-index: 2;
  margin-top: 90px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.hero-stats .stat {
  background: rgba(253,252,250,.85);
  padding: 26px 20px;
  text-align: center;
  backdrop-filter: blur(4px);
}
.stat-num { font-family: var(--serif); font-size: 34px; color: var(--ink-black); font-weight: 700; }
.stat-num i { font-style: normal; font-size: 18px; color: var(--seal-red); margin-left: 2px; }
.stat-label { font-size: 13px; color: var(--ink-light); letter-spacing: 2px; margin-top: 4px; }

/* ---------- 业务卡片 ---------- */
.biz-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.biz-card {
  background: #fff;
  border: 1px solid var(--line);
  padding: 42px 34px;
  position: relative;
  transition: all .35s;
  overflow: hidden;
}
.biz-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 3px;
  background: linear-gradient(90deg, var(--ink-black), var(--ink-light));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .4s;
}
.biz-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 40px rgba(26,26,26,.09);
  border-color: transparent;
}
.biz-card:hover::before { transform: scaleX(1); background: var(--seal-red); }
.biz-icon {
  width: 58px; height: 58px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 24px;
  color: var(--ink-black);
  transition: color .3s;
}
.biz-card:hover .biz-icon { color: var(--seal-red); }
.biz-icon svg { width: 34px; height: 34px; }
.biz-title { font-family: var(--serif); font-size: 21px; color: var(--ink-black); margin-bottom: 6px; letter-spacing: 2px; }
.biz-en { font-size: 11px; color: var(--ink-light); letter-spacing: 2px; text-transform: uppercase; margin-bottom: 16px; }
.biz-desc { font-size: 14px; color: var(--ink-mid); }
.biz-more { display: inline-block; margin-top: 20px; font-size: 13px; color: var(--seal-red); letter-spacing: 1px; }

/* ---------- 为什么选择我们 ---------- */
.feature-row { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; align-items: center; }
.feature-list { display: grid; gap: 34px; }
.feature-item { display: flex; gap: 20px; }
.feature-no {
  font-family: var(--serif);
  font-size: 40px; font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px var(--ink-light);
  line-height: 1;
  flex-shrink: 0;
  padding-top: 4px;
}
.feature-item:hover .feature-no { -webkit-text-stroke-color: var(--seal-red); }
.feature-item h4 { font-family: var(--serif); font-size: 19px; color: var(--ink-black); margin-bottom: 8px; letter-spacing: 1px; }
.feature-item p { font-size: 14px; color: var(--ink-mid); }

.ink-panel {
  position: relative;
  background: linear-gradient(160deg, #2b2b2b, #1a1a1a);
  padding: 56px 46px;
  color: #e8e6e0;
  overflow: hidden;
}
.ink-panel::before {
  content: "匠";
  position: absolute;
  right: -30px; bottom: -50px;
  font-family: var(--serif);
  font-size: 260px;
  color: rgba(255,255,255,.045);
  line-height: 1;
}
.ink-panel h3 { font-family: var(--serif); font-size: 26px; letter-spacing: 3px; margin-bottom: 18px; color: #fff; }
.ink-panel p { font-size: 14px; color: rgba(232,230,224,.75); margin-bottom: 14px; }
.ink-panel .quote-mark { font-family: var(--serif); font-size: 60px; color: var(--seal-red); line-height: .8; display: block; margin-bottom: 18px; }

/* ---------- CTA ---------- */
.cta-band {
  position: relative;
  background:
    radial-gradient(ellipse 50% 80% at 20% 50%, rgba(176,58,46,.16), transparent 70%),
    linear-gradient(120deg, #222 0%, #1a1a1a 100%);
  text-align: center;
  padding: 96px 0;
  overflow: hidden;
}
.cta-band h2 { font-family: var(--serif); color: #fff; font-size: 34px; letter-spacing: 4px; margin-bottom: 16px; }
.cta-band p { color: rgba(255,255,255,.6); font-size: 15px; margin-bottom: 38px; letter-spacing: 1px; }
.cta-band .btn-primary { background: var(--seal-red); }
.cta-band .btn-primary:hover { background: var(--seal-red-deep); }
.cta-band .btn-ghost { border-color: rgba(255,255,255,.35); color: #fff; background: transparent; }
.cta-band .btn-ghost:hover { border-color: #fff; background: rgba(255,255,255,.08); }

/* ---------- 页面小标题（内页 hero） ---------- */
.page-hero {
  position: relative;
  padding: 168px 0 90px;
  background:
    radial-gradient(ellipse 55% 60% at 85% 10%, rgba(176,58,46,.06), transparent 70%),
    linear-gradient(180deg, #fdfcfa, #f4f2ec);
  overflow: hidden;
  text-align: center;
}
.page-hero h1 { font-family: var(--serif); font-size: clamp(32px, 4vw, 46px); color: var(--ink-black); letter-spacing: 6px; margin-bottom: 14px; }
.page-hero .sub { color: var(--ink-light); font-size: 15px; letter-spacing: 3px; }
.page-hero .crumbs { margin-top: 22px; font-size: 13px; color: var(--ink-light); letter-spacing: 1px; }
.page-hero .crumbs a:hover { color: var(--seal-red); }
.page-hero .crumbs i { font-style: normal; margin: 0 8px; color: var(--line); }

/* ---------- 服务详情 ---------- */
.service-block {
  display: grid;
  grid-template-columns: 90px 1fr 1.2fr;
  gap: 34px;
  padding: 44px 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
}
.service-block:last-child { border-bottom: none; }
.service-no {
  font-family: var(--serif);
  font-size: 46px; font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px var(--ink-light);
  line-height: 1;
}
.service-block:hover .service-no { -webkit-text-stroke-color: var(--seal-red); }
.service-block h3 { font-family: var(--serif); font-size: 24px; color: var(--ink-black); letter-spacing: 2px; margin-bottom: 10px; }
.service-block .en { font-size: 12px; color: var(--ink-light); letter-spacing: 2px; text-transform: uppercase; }
.service-block p { font-size: 14.5px; color: var(--ink-mid); }
.service-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.service-tags span {
  font-size: 12.5px;
  color: var(--ink-mid);
  background: var(--ink-wash);
  border: 1px solid var(--line);
  padding: 5px 14px;
  letter-spacing: 1px;
  border-radius: 999px;
  transition: all .3s;
}
.service-tags span:hover { border-color: var(--seal-red); color: var(--seal-red); }

/* ---------- 关于我们 ---------- */
.about-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 70px; align-items: center; }
.about-text h3 { font-family: var(--serif); font-size: 28px; letter-spacing: 3px; color: var(--ink-black); margin-bottom: 22px; }
.about-text p { font-size: 15px; color: var(--ink-mid); margin-bottom: 16px; text-align: justify; }
.about-visual {
  position: relative;
  background: linear-gradient(160deg, #f2f0ea, #e9e6de);
  border: 1px solid var(--line);
  padding: 50px 40px;
  min-height: 380px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
}
.about-visual .big-char {
  position: absolute;
  right: -20px; bottom: -60px;
  font-family: var(--serif);
  font-size: 240px;
  color: rgba(26,26,26,.05);
  line-height: 1;
}
.about-visual .motto { font-family: var(--serif); font-size: 24px; letter-spacing: 4px; color: var(--ink-black); margin-bottom: 14px; }
.about-visual .motto-sub { font-size: 14px; color: var(--ink-light); letter-spacing: 2px; }

.timeline { position: relative; max-width: 760px; margin: 0 auto; }
.timeline::before {
  content: "";
  position: absolute;
  left: 7px; top: 6px; bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--ink-light), var(--line));
}
.tl-item { position: relative; padding-left: 42px; padding-bottom: 44px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: "";
  position: absolute;
  left: 0; top: 8px;
  width: 15px; height: 15px;
  border-radius: 50%;
  border: 2px solid var(--ink-light);
  background: var(--paper);
  transition: .3s;
}
.tl-item:hover::before { border-color: var(--seal-red); background: var(--seal-red); }
.tl-year { font-family: var(--serif); font-size: 22px; font-weight: 700; color: var(--ink-black); letter-spacing: 1px; }
.tl-title { font-size: 16px; color: var(--seal-red); margin: 4px 0 8px; letter-spacing: 1px; }
.tl-desc { font-size: 14px; color: var(--ink-mid); }

.value-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.value-card {
  background: #fff;
  border: 1px solid var(--line);
  padding: 38px 28px;
  text-align: center;
  transition: all .3s;
}
.value-card:hover { transform: translateY(-5px); box-shadow: 0 16px 36px rgba(26,26,26,.08); }
.value-char {
  font-family: var(--serif);
  font-size: 44px; font-weight: 700;
  color: var(--seal-red);
  display: block;
  margin-bottom: 16px;
}
.value-card h4 { font-family: var(--serif); font-size: 18px; color: var(--ink-black); margin-bottom: 10px; letter-spacing: 2px; }
.value-card p { font-size: 13px; color: var(--ink-mid); }

/* ---------- 联系我们 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 60px; }
.contact-info h3 { font-family: var(--serif); font-size: 26px; letter-spacing: 3px; color: var(--ink-black); margin-bottom: 26px; }
.contact-item { display: flex; gap: 16px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.contact-item:last-of-type { border-bottom: none; }
.contact-item .ci-icon {
  width: 46px; height: 46px;
  background: var(--ink-wash);
  display: flex; align-items: center; justify-content: center;
  color: var(--seal-red);
  flex-shrink: 0;
  border-radius: var(--radius);
}
.contact-item .ci-icon svg { width: 22px; height: 22px; }
.contact-item h5 { font-size: 15px; color: var(--ink-black); letter-spacing: 1px; }
.contact-item p { font-size: 14px; color: var(--ink-mid); margin-top: 2px; }

.contact-form {
  background: #fff;
  border: 1px solid var(--line);
  padding: 46px 42px;
}
.contact-form h3 { font-family: var(--serif); font-size: 22px; letter-spacing: 2px; color: var(--ink-black); margin-bottom: 30px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 13px; color: var(--ink-mid); margin-bottom: 8px; letter-spacing: 1px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  background: var(--paper);
  font-size: 14px;
  font-family: var(--sans);
  color: var(--ink-dark);
  outline: none;
  transition: border-color .3s;
  border-radius: var(--radius);
  resize: vertical;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--seal-red); }
.form-tip { font-size: 12px; color: var(--ink-light); margin-top: 14px; text-align: center; }

/* ---------- 页脚 ---------- */
.footer {
  background: #171717;
  color: rgba(255,255,255,.55);
  padding: 72px 0 0;
}
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 50px; padding-bottom: 56px; }
.footer .brand-name .cn { color: #fff; }
.footer .brand-name .en { color: rgba(255,255,255,.4); }
.footer-about p { font-size: 13.5px; margin: 20px 0 0; line-height: 1.9; }
.footer h5 { font-family: var(--serif); color: #fff; font-size: 16px; letter-spacing: 2px; margin-bottom: 22px; }
.footer-links li { margin-bottom: 12px; }
.footer-links a { font-size: 13.5px; color: rgba(255,255,255,.55); }
.footer-links a:hover { color: #fff; padding-left: 4px; }
.footer-contact li { font-size: 13.5px; margin-bottom: 14px; display: flex; gap: 10px; align-items: flex-start; }
.footer-contact svg { width: 16px; height: 16px; flex-shrink: 0; margin-top: 4px; color: rgba(255,255,255,.4); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding: 22px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 13px;
  color: rgba(255,255,255,.4);
}
.footer-bottom a { color: rgba(255,255,255,.55); }
.footer-bottom a:hover { color: #fff; }

/* ---------- 响应式 ---------- */
@media (max-width: 992px) {
  .section { padding: 70px 0; }
  .biz-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-row, .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .value-grid { grid-template-columns: repeat(2, 1fr); }
  .value-grid[style*="max-width:calc(25%"] { max-width: calc(50% - 12px) !important; }
  .service-block { grid-template-columns: 60px 1fr; }
  .service-block .service-desc-col { grid-column: 2; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-seal-mark { display: none; }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 72px; left: 0; right: 0;
    background: var(--paper);
    flex-direction: column;
    gap: 0;
    padding: 10px 6%;
    border-bottom: 1px solid var(--line);
    max-height: 0;
    overflow: hidden;
    transition: max-height .35s ease;
  }
  .nav-links.open { max-height: 400px; }
  .nav-links a { padding: 14px 0; width: 100%; }
  .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .value-grid[style*="max-width:calc(25%"], .value-grid[style*="max-width:calc(50%"] { max-width: 100% !important; }
  .sec-title { font-size: 28px; }
  .biz-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 36px; }
  .footer-bottom { justify-content: center; text-align: center; }
  .hero { min-height: auto; padding-bottom: 60px; }
  .hero-stats { margin-top: 60px; }
  .contact-form { padding: 34px 24px; }
}