/* =========================================================
   上海孚和贸易官网 · 现代简约 + 东方茶韵
   ========================================================= */

:root {
  --color-bg: #faf8f3;
  --color-bg-alt: #f3efe6;
  --color-ink: #1d2520;
  --color-ink-soft: #4a554d;
  --color-muted: #8b9189;
  --color-line: #e6dfd1;
  --color-tea: #2d3e35;
  --color-tea-deep: #1a2620;
  --color-gold: #b89968;
  --color-gold-deep: #9a7d4f;
  --color-white: #ffffff;

  --font-serif: "Songti SC", "STSong", "SimSun", "FangSong", "STFangsong", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", "微软雅黑", "Hiragino Sans GB", sans-serif;

  --container: 1200px;
  --radius: 4px;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-ink);
  background: var(--color-bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color .2s var(--ease); }
ul { list-style: none; padding: 0; margin: 0; }
em { font-style: normal; color: var(--color-gold-deep); font-weight: 500; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 20px 0;
  background: transparent;
  transition: all .35s var(--ease);
}
.nav.is-scrolled {
  background: rgba(250, 248, 243, 0.92);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  padding: 14px 0;
  border-bottom: 1px solid var(--color-line);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.nav__logo {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  background: var(--color-tea);
  color: var(--color-bg);
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 20px;
  border-radius: 50%;
  letter-spacing: 0;
}
.nav__name {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 2px;
}
.nav.is-light .nav__brand,
.nav.is-light .nav__links a { color: var(--color-bg); }
.nav.is-light.is-scrolled .nav__brand,
.nav.is-light.is-scrolled .nav__links a { color: var(--color-ink); }

.nav__links {
  display: flex;
  gap: 36px;
  font-size: 14.5px;
}
.nav__links a {
  position: relative;
  padding: 4px 0;
  color: var(--color-ink-soft);
}
.nav__links a:hover { color: var(--color-tea); }
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 1px;
  background: var(--color-gold);
  transition: width .3s var(--ease);
}
.nav__links a:hover::after { width: 100%; }

.nav__toggle {
  display: none;
  width: 28px; height: 22px;
  background: transparent; border: 0; padding: 0;
  position: relative; cursor: pointer;
}
.nav__toggle span {
  position: absolute; left: 0; right: 0;
  height: 1.5px; background: var(--color-ink);
  transition: all .25s var(--ease);
}
.nav__toggle span:nth-child(1) { top: 2px; }
.nav__toggle span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.nav__toggle span:nth-child(3) { bottom: 2px; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  color: var(--color-bg);
  background: var(--color-tea-deep);
}
.hero__bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 70% 20%, rgba(184,153,104,0.18), transparent 55%),
    radial-gradient(ellipse at 20% 80%, rgba(45,62,53,0.6), transparent 60%),
    linear-gradient(180deg, #1a2620 0%, #2d3e35 60%, #1d2820 100%);
}
.hero__bg::before,
.hero__bg::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(184,153,104,0.12);
}
.hero__bg::before {
  width: 720px; height: 720px;
  right: -180px; top: -180px;
  animation: drift 18s ease-in-out infinite alternate;
}
.hero__bg::after {
  width: 460px; height: 460px;
  left: -120px; bottom: -180px;
  border-color: rgba(184,153,104,0.08);
  animation: drift 22s ease-in-out infinite alternate-reverse;
}
@keyframes drift {
  from { transform: translate(0,0); }
  to { transform: translate(30px, 20px); }
}

.hero__inner {
  position: relative;
  z-index: 2;
  padding: 140px 32px 120px;
  width: 100%;
}
.hero__eyebrow {
  font-size: 12px;
  letter-spacing: 4px;
  color: var(--color-gold);
  margin-bottom: 32px;
  font-weight: 500;
  text-transform: uppercase;
  opacity: 0;
  animation: fadeUp .9s var(--ease) .1s forwards;
}
.hero__title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(48px, 8vw, 104px);
  line-height: 1.05;
  letter-spacing: 8px;
  margin: 0 0 36px;
  opacity: 0;
  animation: fadeUp 1s var(--ease) .25s forwards;
}
.hero__dot {
  color: var(--color-gold);
  margin: 0 8px;
  font-weight: 400;
}
.hero__subtitle {
  font-size: clamp(15px, 1.4vw, 18px);
  line-height: 2;
  color: rgba(250,248,243,0.78);
  max-width: 580px;
  margin: 0 0 48px;
  opacity: 0;
  animation: fadeUp 1s var(--ease) .45s forwards;
}
.hero__cta {
  display: flex;
  gap: 16px;
  opacity: 0;
  animation: fadeUp 1s var(--ease) .65s forwards;
}
.hero__scroll {
  position: absolute;
  bottom: 48px; left: 50%;
  transform: translateX(-50%);
  width: 1px; height: 56px;
  background: rgba(250,248,243,0.2);
  overflow: hidden;
}
.hero__scroll span {
  display: block; width: 100%; height: 30%;
  background: var(--color-gold);
  animation: scrollDown 2.2s ease-in-out infinite;
}
@keyframes scrollDown {
  0% { transform: translateY(-100%); }
  100% { transform: translateY(330%); }
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: 1.5px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all .25s var(--ease);
  font-family: var(--font-sans);
}
.btn--primary {
  background: var(--color-gold);
  color: var(--color-tea-deep);
  border-color: var(--color-gold);
}
.btn--primary:hover {
  background: var(--color-gold-deep);
  border-color: var(--color-gold-deep);
  color: var(--color-bg);
  transform: translateY(-1px);
}
.btn--ghost {
  background: transparent;
  color: var(--color-bg);
  border-color: rgba(250,248,243,0.4);
}
.btn--ghost:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
}
.btn--block { width: 100%; padding: 16px; }

/* ---------- Section base ---------- */
.section {
  padding: 120px 0;
  position: relative;
}
.section__eyebrow {
  font-size: 12px;
  letter-spacing: 4px;
  color: var(--color-gold-deep);
  font-weight: 500;
  margin-bottom: 24px;
  text-transform: uppercase;
}
.section__eyebrow--light { color: var(--color-gold); }
.section__title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(32px, 4vw, 52px);
  line-height: 1.25;
  letter-spacing: 3px;
  margin: 0 0 24px;
  color: var(--color-ink);
}
.section__title--light { color: var(--color-bg); }
.section__desc {
  font-size: 16px;
  color: var(--color-ink-soft);
  max-width: 640px;
  line-height: 1.9;
  margin: 0;
}
.section__head {
  margin-bottom: 64px;
  max-width: 720px;
}
.section__head--center {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}
.section__head--center .section__desc { margin: 0 auto; }

/* ---------- About ---------- */
.about {
  background: var(--color-bg);
  border-top: 1px solid var(--color-line);
}
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 80px;
  align-items: start;
}
.about__lead {
  font-family: var(--font-serif);
  font-size: 24px;
  line-height: 1.7;
  color: var(--color-ink);
  margin: 0 0 28px;
  letter-spacing: 1.5px;
  padding-left: 18px;
  border-left: 2px solid var(--color-gold);
}
.about__content p {
  font-size: 16px;
  line-height: 2;
  color: var(--color-ink-soft);
  margin: 0 0 20px;
}
.about__content strong {
  color: var(--color-tea);
  font-weight: 600;
}

/* ---------- Services ---------- */
.services {
  background: var(--color-bg-alt);
}
.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--color-line);
  border: 1px solid var(--color-line);
}
.service-card {
  background: var(--color-bg);
  padding: 48px 36px;
  transition: all .35s var(--ease);
  position: relative;
}
.service-card:hover {
  background: var(--color-tea);
  color: var(--color-bg);
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(29,37,32,0.15);
}
.service-card__num {
  font-family: var(--font-serif);
  font-size: 14px;
  color: var(--color-gold-deep);
  letter-spacing: 2px;
  margin-bottom: 20px;
  font-weight: 500;
}
.service-card:hover .service-card__num { color: var(--color-gold); }
.service-card__title {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 500;
  margin: 0 0 16px;
  letter-spacing: 1.5px;
  line-height: 1.4;
}
.service-card__desc {
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--color-ink-soft);
  margin: 0;
}
.service-card:hover .service-card__desc { color: rgba(250,248,243,0.78); }

/* ---------- Numbers ---------- */
.numbers {
  background: var(--color-tea-deep);
  color: var(--color-bg);
  position: relative;
  overflow: hidden;
}
.numbers::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 80% 20%, rgba(184,153,104,0.12), transparent 60%);
  pointer-events: none;
}
.numbers__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  position: relative;
}
.num-item {
  text-align: center;
  padding: 32px 16px;
  border-left: 1px solid rgba(250,248,243,0.08);
}
.num-item:first-child { border-left: 0; }
.num-item__value {
  font-family: var(--font-serif);
  font-size: clamp(48px, 5.5vw, 80px);
  font-weight: 500;
  color: var(--color-gold);
  line-height: 1;
  letter-spacing: 2px;
  margin-bottom: 16px;
}
.num-item__label {
  font-size: 13.5px;
  color: rgba(250,248,243,0.7);
  line-height: 1.7;
  letter-spacing: 1px;
}

/* ---------- Cities ---------- */
.cities {
  background: var(--color-bg);
}
.cities__list {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  border-top: 1px solid var(--color-line);
}
.city {
  padding: 44px 24px;
  border-right: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  text-align: center;
  transition: all .3s var(--ease);
  cursor: default;
}
.city:last-child { border-right: 0; }
.city:hover {
  background: var(--color-tea);
  color: var(--color-bg);
}
.city__name {
  display: block;
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 500;
  letter-spacing: 4px;
  margin-bottom: 8px;
}
.city__en {
  display: block;
  font-size: 11px;
  letter-spacing: 3px;
  color: var(--color-muted);
  text-transform: uppercase;
}
.city:hover .city__en { color: var(--color-gold); }

/* ---------- Join ---------- */
.join {
  background: var(--color-bg-alt);
  text-align: center;
}
.join__inner {
  max-width: 760px;
  margin: 0 auto;
}
.join__title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(32px, 4.5vw, 56px);
  line-height: 1.3;
  letter-spacing: 4px;
  margin: 16px 0 32px;
  color: var(--color-ink);
}
.join__quote {
  font-family: var(--font-serif);
  font-size: 20px;
  color: var(--color-gold-deep);
  margin: 0 0 24px;
  letter-spacing: 1px;
}
.join__desc {
  font-size: 16px;
  color: var(--color-ink-soft);
  line-height: 2;
  max-width: 560px;
  margin: 0 auto 40px;
}

/* ---------- Contact ---------- */
.contact {
  background: var(--color-bg);
}
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 80px;
  align-items: start;
}
.contact__desc {
  font-size: 16px;
  line-height: 1.9;
  color: var(--color-ink-soft);
  margin: 0 0 36px;
  max-width: 460px;
}
.contact__list { display: flex; flex-direction: column; gap: 16px; }
.contact__list li {
  display: flex;
  gap: 24px;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-line);
  font-size: 15px;
}
.contact__k {
  width: 60px;
  color: var(--color-muted);
  letter-spacing: 2px;
  flex-shrink: 0;
}
.contact__v { color: var(--color-ink); }

.contact__form {
  background: var(--color-bg-alt);
  padding: 40px;
  border: 1px solid var(--color-line);
}
.contact__form label {
  display: block;
  margin-bottom: 20px;
}
.contact__form span {
  display: block;
  font-size: 13px;
  color: var(--color-ink-soft);
  margin-bottom: 8px;
  letter-spacing: 1.5px;
}
.contact__form input,
.contact__form textarea {
  width: 100%;
  padding: 12px 14px;
  font-family: var(--font-sans);
  font-size: 15px;
  background: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  color: var(--color-ink);
  transition: border-color .2s var(--ease);
  resize: vertical;
}
.contact__form input:focus,
.contact__form textarea:focus {
  outline: none;
  border-color: var(--color-gold);
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.form-tip {
  margin: 16px 0 0;
  font-size: 13px;
  color: var(--color-gold-deep);
  text-align: center;
  min-height: 18px;
}

/* ---------- Footer ---------- */
.footer {
  background: var(--color-tea-deep);
  color: rgba(250,248,243,0.7);
  padding: 48px 0;
}
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}
.footer__brand {
  display: flex;
  align-items: center;
  gap: 16px;
}
.footer__logo {
  width: 44px; height: 44px;
  display: grid; place-items: center;
  background: var(--color-gold);
  color: var(--color-tea-deep);
  font-family: var(--font-serif);
  font-size: 22px;
  border-radius: 50%;
}
.footer__name {
  color: var(--color-bg);
  font-family: var(--font-serif);
  font-size: 16px;
  letter-spacing: 2px;
  margin-bottom: 4px;
}
.footer__slogan {
  font-size: 12px;
  letter-spacing: 3px;
  color: var(--color-gold);
}
.footer__copy {
  font-size: 12.5px;
  letter-spacing: 1px;
}

/* ---------- Reveal Animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .8s var(--ease), transform .8s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .section { padding: 80px 0; }
  .container { padding: 0 24px; }

  .nav__links {
    position: fixed;
    top: 64px; left: 0; right: 0;
    background: var(--color-bg);
    flex-direction: column;
    gap: 0;
    padding: 16px 24px 32px;
    border-bottom: 1px solid var(--color-line);
    transform: translateY(-120%);
    transition: transform .35s var(--ease);
  }
  .nav__links.is-open { transform: translateY(0); }
  .nav__links li { border-bottom: 1px solid var(--color-line); }
  .nav__links li:last-child { border-bottom: 0; }
  .nav__links a { display: block; padding: 16px 0; }
  .nav__toggle { display: block; }

  .about__grid,
  .contact__grid { grid-template-columns: 1fr; gap: 40px; }
  .services__grid { grid-template-columns: 1fr 1fr; }
  .numbers__grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  .num-item { border-left: 0; padding: 24px 12px; }
  .num-item:nth-child(odd) { border-right: 1px solid rgba(250,248,243,0.08); }
  .num-item:nth-child(-n+2) { border-bottom: 1px solid rgba(250,248,243,0.08); }
  .cities__list { grid-template-columns: 1fr 1fr; }
  .city { border-right: 1px solid var(--color-line); }
  .city:nth-child(2n) { border-right: 0; }
  .form-row { grid-template-columns: 1fr; }
  .contact__form { padding: 28px; }
}

@media (max-width: 560px) {
  .services__grid { grid-template-columns: 1fr; }
  .cities__list { grid-template-columns: 1fr; }
  .city { border-right: 0; }
  .hero__title { letter-spacing: 4px; }
  .hero__cta { flex-direction: column; }
  .hero__cta .btn { width: 100%; }
}