/* ============================================================
   九竺科技 · 设计系统
   商务稳重大气：深竹青 + 暖金 + 米白
   加载顺序：style.css -> design-system.css -> <page>.css
   ============================================================ */

:root {
  /* 色板 */
  --fe-ink-900: #08251c;
  --fe-ink-800: #0e3b2e;
  --fe-ink-700: #14503e;
  --fe-ink-600: #1c6249;
  --fe-gold-400: #d8bd8f;
  --fe-gold-500: #c9a876;
  --fe-gold-600: #b08f5b;
  --fe-paper: #faf8f4;
  --fe-paper-2: #f1ede4;
  --fe-surface: #ffffff;
  --fe-text-1: #17211d;
  --fe-text-2: #55625c;
  --fe-text-3: #8a9690;
  --fe-line: rgba(14, 59, 46, 0.12);
  --fe-line-strong: rgba(14, 59, 46, 0.24);

  /* 字体 */
  --fe-sans: "PingFang SC", "HarmonyOS Sans SC", "MiSans", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  /* 全站统一苹方：标题暂与正文同源。想恢复衬线标题只改这一行即可 */
  --fe-serif: var(--fe-sans);

  /* 字号阶梯 */
  --fe-fs-eyebrow: 0.75rem;
  --fe-fs-sm: 0.875rem;
  --fe-fs-base: 1rem;
  --fe-fs-lg: 1.125rem;
  --fe-fs-xl: clamp(1.25rem, 1rem + 1.2vw, 1.6rem);
  --fe-fs-h3: clamp(1.35rem, 1.1rem + 1.1vw, 1.8rem);
  --fe-fs-h2: clamp(1.75rem, 1.3rem + 2.2vw, 2.75rem);
  --fe-fs-h1: clamp(2.25rem, 1.5rem + 3.6vw, 4rem);
  --fe-fs-num: clamp(2rem, 1.4rem + 3vw, 3.5rem);

  /* 间距 */
  --fe-gap-1: 4px;
  --fe-gap-2: 8px;
  --fe-gap-3: 12px;
  --fe-gap-4: 16px;
  --fe-gap-5: 24px;
  --fe-gap-6: 32px;
  --fe-gap-7: 48px;
  --fe-gap-8: 64px;
  --fe-gap-9: 96px;
  --fe-section-y: clamp(56px, 7vw, 112px);

  /* 布局 */
  --fe-container: 1280px;
  --fe-container-narrow: 960px;
  --fe-pad-x: clamp(16px, 4vw, 48px);
  --fe-header-h: 84px;
  --fe-header-h-sm: 64px;

  /* 其他 */
  --fe-radius-s: 2px;
  --fe-radius-m: 6px;
  --fe-radius-l: 12px;
  --fe-shadow-s: 0 1px 2px rgba(8, 37, 28, 0.06), 0 2px 8px rgba(8, 37, 28, 0.05);
  --fe-shadow-m: 0 4px 12px rgba(8, 37, 28, 0.07), 0 16px 40px rgba(8, 37, 28, 0.08);
  --fe-shadow-l: 0 12px 28px rgba(8, 37, 28, 0.10), 0 32px 72px rgba(8, 37, 28, 0.12);
  --fe-ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 基础 ---------- */
/* 新页眉高度会小于/大于旧值，全站统一让位，避免内容被固定页眉遮挡 */
body {
  padding-top: var(--fe-header-h);
}

/* 全站字体统一：其余 5 个页面没有 fe-body 类，靠这条规则生效 */
body,
button,
input,
textarea,
select {
  font-family: var(--fe-sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* 锚点定位时让出固定页眉的高度 */
[id] {
  scroll-margin-top: calc(var(--fe-header-h) + 20px);
}

body.fe-body {
  margin: 0;
  padding-top: var(--fe-header-h);
  background: var(--fe-paper);
  color: var(--fe-text-1);
  font-family: var(--fe-sans);
  font-size: var(--fe-fs-base);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.fe-container {
  width: 100%;
  max-width: var(--fe-container);
  margin-inline: auto;
  padding-inline: var(--fe-pad-x);
}

.fe-container--narrow {
  max-width: var(--fe-container-narrow);
}

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

.fe-section--tint {
  background: var(--fe-surface);
}

.fe-section--paper {
  background: var(--fe-paper);
}

.fe-grid {
  display: grid;
  gap: var(--fe-gap-5);
}

/* ---------- 区块标题 ---------- */
.fe-eyebrow {
  display: block;
  font-size: var(--fe-fs-eyebrow);
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--fe-gold-600);
  font-weight: 600;
}

.fe-heading {
  display: flex;
  flex-direction: column;
  gap: var(--fe-gap-3);
  margin-bottom: var(--fe-gap-7);
}

.fe-heading__title {
  font-family: var(--fe-serif);
  font-size: var(--fe-fs-h2);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.04em;
  color: var(--fe-ink-800);
  margin: 0;
}

.fe-heading__rule {
  width: 56px;
  height: 2px;
  background: var(--fe-gold-500);
  border: 0;
  margin: 0;
}

.fe-heading__sub {
  font-size: var(--fe-fs-base);
  color: var(--fe-text-2);
  max-width: 68ch;
  margin: 0;
}

.fe-heading--center {
  align-items: center;
  text-align: center;
}

.fe-heading--center .fe-heading__rule {
  margin-inline: auto;
}

/* ---------- 按钮 ---------- */
.fe-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--fe-gap-2);
  padding: 13px 30px;
  font-size: var(--fe-fs-base);
  font-family: var(--fe-sans);
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1;
  border: 1px solid transparent;
  border-radius: var(--fe-radius-s);
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.35s var(--fe-ease), box-shadow 0.35s var(--fe-ease),
    background-color 0.35s var(--fe-ease), color 0.35s var(--fe-ease);
}

.fe-btn:hover {
  transform: translateY(-2px);
}

.fe-btn:active {
  transform: translateY(0);
}

.fe-btn--primary {
  background: var(--fe-gold-500);
  color: var(--fe-ink-900);
}

.fe-btn--primary:hover {
  background: var(--fe-gold-400);
  box-shadow: var(--fe-shadow-m);
}

.fe-btn--ghost {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.55);
}

.fe-btn--ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: #fff;
}

.fe-btn--ink {
  background: var(--fe-ink-800);
  color: #fff;
}

.fe-btn--ink:hover {
  background: var(--fe-ink-700);
  box-shadow: var(--fe-shadow-m);
}

.fe-btn--outline {
  background: transparent;
  color: var(--fe-ink-800);
  border-color: var(--fe-line-strong);
}

.fe-btn--outline:hover {
  background: var(--fe-ink-800);
  color: #fff;
  border-color: var(--fe-ink-800);
}

/* ---------- 页眉 ---------- */
.fe-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 1000;
  height: var(--fe-header-h);
  background: rgba(250, 248, 244, 0.92);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--fe-line);
  transition: height 0.35s var(--fe-ease), box-shadow 0.35s var(--fe-ease),
    background-color 0.35s var(--fe-ease);
}

.fe-header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--fe-gap-5);
}

.fe-brand {
  display: flex;
  align-items: center;
  gap: var(--fe-gap-3);
  cursor: pointer;
  flex: none;
}

.fe-brand__mark {
  width: 42px;
  height: 42px;
  flex: none;
  border-radius: 50%;
  background: var(--fe-ink-800);
  color: var(--fe-gold-500);
  font-family: var(--fe-serif);
  font-size: 22px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: inset 0 0 0 1px rgba(201, 168, 118, 0.55);
}

.fe-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.fe-brand__name {
  font-family: var(--fe-serif);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--fe-ink-800);
  white-space: nowrap;
}

.fe-brand__latin {
  font-size: 0.62rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--fe-text-3);
  white-space: nowrap;
}

.fe-nav {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2.2vw, 34px);
  margin-left: auto;
}

.fe-nav__item {
  position: relative;
  padding: 6px 0;
  font-size: var(--fe-fs-base);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--fe-text-1);
  cursor: pointer;
  white-space: nowrap;
  background: none;
  border: 0;
  font-family: var(--fe-sans);
  transition: color 0.3s var(--fe-ease);
}

.fe-nav__item::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--fe-gold-500);
  transform: translateX(-50%);
  transition: width 0.32s var(--fe-ease);
}

.fe-nav__item:hover {
  color: var(--fe-ink-600);
}

.fe-nav__item:hover::after,
.fe-nav__item.is-active::after {
  width: 100%;
}

.fe-nav__item.is-active {
  color: var(--fe-ink-800);
  font-weight: 700;
}

.fe-header__tools {
  display: flex;
  align-items: center;
  gap: var(--fe-gap-3);
  flex: none;
  margin-left: auto;
}

.fe-lang {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border: 1px solid var(--fe-line-strong);
  border-radius: 999px;
  font-size: var(--fe-fs-sm);
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--fe-ink-800);
  cursor: pointer;
  background: transparent;
  transition: background-color 0.3s var(--fe-ease), color 0.3s var(--fe-ease);
  white-space: nowrap;
}

.fe-lang:hover {
  background: var(--fe-ink-800);
  color: #fff;
  border-color: var(--fe-ink-800);
}

.fe-lang__on {
  opacity: 1;
}

.fe-lang__off {
  opacity: 0.4;
}

/* 汉堡按钮 */
.fe-burger {
  display: none;
  width: 44px;
  height: 44px;
  border: 0;
  background: transparent;
  cursor: pointer;
  padding: 0;
  margin-left: auto;
  align-items: center;
  justify-content: center;
}

.fe-burger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--fe-ink-800);
  border-radius: 2px;
  transition: transform 0.32s var(--fe-ease), opacity 0.2s var(--fe-ease);
}

.fe-burger span + span {
  margin-top: 6px;
}

.fe-burger.is-open span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.fe-burger.is-open span:nth-child(2) {
  opacity: 0;
}

.fe-burger.is-open span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* 移动端抽屉 */
.fe-drawer-scrim {
  position: fixed;
  inset: 0;
  z-index: 998;
  background: rgba(8, 37, 28, 0.45);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s var(--fe-ease);
}

.fe-drawer-scrim.is-open {
  opacity: 1;
  pointer-events: auto;
}

.fe-drawer {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 999;
  width: min(320px, 84vw);
  height: 100dvh;
  background: var(--fe-paper);
  box-shadow: var(--fe-shadow-l);
  transform: translateX(-102%);
  transition: transform 0.36s var(--fe-ease);
  display: flex;
  flex-direction: column;
  padding-top: calc(var(--fe-header-h) + 16px);
  overflow-y: auto;
}

.fe-drawer.is-open {
  transform: translateX(0);
}

.fe-drawer__label {
  padding: 0 var(--fe-gap-5);
  font-size: var(--fe-fs-eyebrow);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--fe-gold-600);
  margin-bottom: var(--fe-gap-3);
}

.fe-drawer__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px var(--fe-gap-5);
  font-size: var(--fe-fs-lg);
  color: var(--fe-text-1);
  border-bottom: 1px solid var(--fe-line);
  cursor: pointer;
  transition: background-color 0.25s var(--fe-ease), color 0.25s var(--fe-ease);
}

.fe-drawer__item:active,
.fe-drawer__item:hover {
  background: var(--fe-paper-2);
}

.fe-drawer__item.is-active {
  color: var(--fe-ink-800);
  font-weight: 700;
}

.fe-drawer__item .idx {
  font-size: var(--fe-fs-eyebrow);
  letter-spacing: 0.12em;
  color: var(--fe-text-3);
  font-family: var(--fe-serif);
}

.fe-drawer__foot {
  margin-top: auto;
  padding: var(--fe-gap-5);
  display: flex;
  flex-direction: column;
  gap: var(--fe-gap-3);
}

/* ---------- 页脚 ---------- */
.fe-footer {
  background: var(--fe-ink-900);
  color: rgba(255, 255, 255, 0.68);
  font-size: var(--fe-fs-sm);
  line-height: 1.9;
  position: relative;
  overflow: hidden;
}

.fe-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--fe-gold-500) 22%, var(--fe-gold-500) 78%, transparent);
  opacity: 0.75;
}

.fe-footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 0.8fr 1.4fr 0.9fr;
  gap: clamp(24px, 4vw, 56px);
  padding-block: clamp(40px, 5vw, 72px);
}

.fe-footer__brand {
  display: flex;
  align-items: center;
  gap: var(--fe-gap-3);
  margin-bottom: var(--fe-gap-4);
}

.fe-footer__brand .fe-brand__mark {
  background: rgba(255, 255, 255, 0.06);
  color: var(--fe-gold-500);
}

.fe-footer__brand .fe-brand__name {
  color: #fff;
}

.fe-footer__brand .fe-brand__latin {
  color: rgba(255, 255, 255, 0.42);
}

.fe-footer__desc {
  max-width: 38ch;
  color: rgba(255, 255, 255, 0.55);
}

.fe-footer__title {
  font-size: var(--fe-fs-base);
  font-weight: 700;
  letter-spacing: 0.16em;
  color: #fff;
  margin: 0 0 var(--fe-gap-4);
  padding-bottom: var(--fe-gap-2);
  position: relative;
}

.fe-footer__title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 26px;
  height: 1px;
  background: var(--fe-gold-500);
}

.fe-footer__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.fe-footer__links a {
  color: rgba(255, 255, 255, 0.66);
  text-decoration: none;
  cursor: pointer;
  transition: color 0.25s var(--fe-ease), padding-left 0.25s var(--fe-ease);
}

.fe-footer__links a:hover {
  color: var(--fe-gold-400);
  padding-left: 5px;
}

.fe-contact-line {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 10px;
}

.fe-contact-line__k {
  flex: none;
  min-width: 3.5em;
  color: rgba(255, 255, 255, 0.4);
  letter-spacing: 0.06em;
}

.fe-contact-line__v {
  color: rgba(255, 255, 255, 0.82);
  word-break: break-word;
}

.fe-contact-line__v a {
  color: inherit;
  text-decoration: none;
  transition: color 0.25s var(--fe-ease);
}

.fe-contact-line__v a:hover {
  color: var(--fe-gold-400);
}

.fe-footer__hotline {
  font-family: var(--fe-serif);
  font-size: clamp(1.3rem, 1.1rem + 1vw, 1.75rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--fe-gold-500);
  margin-bottom: var(--fe-gap-4);
}

.fe-footer__qr {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.fe-footer__qr img {
  width: 118px;
  height: 118px;
  padding: 6px;
  background: #fff;
  border-radius: var(--fe-radius-m);
  object-fit: contain;
}

.fe-footer__qr span {
  font-size: var(--fe-fs-eyebrow);
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.45);
}

.fe-footer__bar {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-block: var(--fe-gap-4);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--fe-gap-3);
  font-size: var(--fe-fs-eyebrow);
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.42);
}

.fe-footer__bar a {
  color: inherit;
  text-decoration: none;
}

.fe-footer__bar a:hover {
  color: var(--fe-gold-400);
}

/* ---------- 滚动进场 ---------- */
/* 默认必须是可见的：进场动画只是增强，不能让内容依赖 JS 才显示。
   只有 JS 确认 IntersectionObserver 可用时，才给 <html> 加上 .fe-anim-on 开启隐藏态。 */
.fe-reveal {
  opacity: 1;
  transform: none;
}

.fe-anim-on .fe-reveal:not(.is-in) {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.85s var(--fe-ease), transform 0.85s var(--fe-ease);
  will-change: opacity, transform;
}

.fe-anim-on .fe-reveal.is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1180px) {
  .fe-footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 980px) {
  .fe-nav {
    display: none;
  }
  .fe-burger {
    display: flex;
  }
  :root {
    --fe-header-h: var(--fe-header-h-sm);
  }
}

@media (max-width: 720px) {
  .fe-footer__grid {
    grid-template-columns: 1fr;
    gap: var(--fe-gap-6);
  }
  .fe-brand__latin {
    display: none;
  }
  .fe-footer__bar {
    justify-content: center;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .fe-anim-on .fe-reveal:not(.is-in) {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .fe-header,
  .fe-drawer,
  .fe-btn {
    transition: none;
  }
}