/* =========================================================
   月老宝宝官网 · 简单大气 / 高知人群定位
   配色：宣纸白底 × 墨色文字 × 朱红点缀
   ========================================================= */
:root {
  --paper: #FAF7F2;
  --paper-dark: #F4EDE3;
  --ink: #23201C;
  --ink-soft: #6B655C;
  --vermilion: #B23A32;
  --vermilion-deep: #933029;
  --gold: #B98A2F;
  --line: #E8DFD2;
  --serif: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  font-weight: 400;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }

.container { width: min(1120px, 92%); margin: 0 auto; }

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-block;
  padding: .72rem 1.7rem;
  border-radius: 999px;
  font-size: .95rem;
  font-weight: 500;
  text-decoration: none;
  letter-spacing: .05em;
  transition: transform .25s ease, box-shadow .25s ease, background .25s ease, color .25s ease;
}
.btn--solid { background: var(--vermilion); color: #fff; box-shadow: 0 6px 18px rgba(178, 58, 50, .25); }
.btn--solid:hover { background: var(--vermilion-deep); transform: translateY(-2px); box-shadow: 0 10px 24px rgba(178, 58, 50, .3); }
.btn--ghost { color: var(--ink); border: 1px solid var(--ink); }
.btn--ghost:hover { background: var(--ink); color: var(--paper); transform: translateY(-2px); }
.btn--lg { padding: .95rem 2.3rem; font-size: 1.02rem; }

/* ---------- 导航 ---------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  background: rgba(250, 247, 242, 0);
  transition: background .35s ease, box-shadow .35s ease;
}
.nav--scrolled { background: rgba(250, 247, 242, .92); backdrop-filter: blur(12px); box-shadow: 0 1px 0 var(--line); }
.nav__inner { display: flex; align-items: center; gap: 2.4rem; height: 72px; }
.nav__brand { display: flex; align-items: center; gap: .55rem; text-decoration: none; color: var(--ink); }
.nav__logo { color: var(--ink); }
.nav__name { font-family: var(--serif); font-size: 1.28rem; font-weight: 700; letter-spacing: .12em; }
.nav__links { display: flex; gap: 2.1rem; margin-left: auto; }
.nav__links a { color: var(--ink-soft); text-decoration: none; font-size: .95rem; letter-spacing: .06em; transition: color .2s; }
.nav__links a:hover { color: var(--vermilion); }
.nav__cta { margin-left: .4rem; }
.nav__toggle { display: none; background: none; border: 0; cursor: pointer; padding: .5rem; }
.nav__toggle span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 5px 0; transition: transform .3s, opacity .3s; }
.nav__toggle--open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle--open span:nth-child(2) { opacity: 0; }
.nav__toggle--open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  position: fixed; inset: 72px 0 auto 0; z-index: 99;
  background: var(--paper); border-bottom: 1px solid var(--line);
  display: none; flex-direction: column; gap: .2rem;
  padding: 1rem 6% 1.6rem;
}
.mobile-menu--open { display: flex; }
.mobile-menu a { padding: .8rem 0; color: var(--ink); text-decoration: none; font-size: 1.05rem; border-bottom: 1px solid var(--line); }
.mobile-menu a:last-child { border-bottom: 0; margin-top: .6rem; text-align: center; }

/* ---------- Hero ---------- */
.hero { padding: 168px 0 110px; }
.hero__grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 4rem; align-items: center; }
.hero__eyebrow {
  display: inline-block; font-size: .82rem; letter-spacing: .35em;
  color: var(--vermilion); border: 1px solid rgba(178, 58, 50, .35);
  border-radius: 999px; padding: .28rem 1.1rem; margin-bottom: 1.6rem;
}
.hero__title {
  font-family: var(--serif); font-weight: 900;
  font-size: clamp(2.3rem, 4.6vw, 3.7rem);
  line-height: 1.28; letter-spacing: .02em; margin-bottom: 1.5rem;
}
.hero__title em { font-style: normal; color: var(--vermilion); position: relative; }
.hero__title em::after {
  content: ""; position: absolute; left: 2%; right: 2%; bottom: .04em;
  height: .42em; background: rgba(178, 58, 50, .12); z-index: -1; border-radius: 3px;
}
.hero__sub { color: var(--ink-soft); font-size: 1.05rem; max-width: 34em; margin-bottom: 2.2rem; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 1rem; margin-bottom: 2.4rem; }
.hero__points { display: flex; gap: 2rem; list-style: none; }
.hero__points li {
  font-size: .9rem; letter-spacing: .18em; color: var(--ink-soft);
  display: flex; align-items: center; gap: .55rem;
}
.hero__points li::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--vermilion); }

.thread-svg { width: 100%; height: auto; }
.thread { animation: thread-draw 2.2s ease .8s forwards; }
.knot { opacity: 0; animation: knot-in .6s ease 2.6s forwards; }
@keyframes thread-draw { to { stroke-dashoffset: 0; } }
@keyframes knot-in { to { opacity: 1; } }

/* ---------- 通用分区 ---------- */
.section { padding: 108px 0; }
.section__eyebrow {
  font-size: .82rem; letter-spacing: .4em; color: var(--vermilion);
  margin-bottom: .9rem;
}
.section__title {
  font-family: var(--serif); font-weight: 700;
  font-size: clamp(1.7rem, 3vw, 2.4rem); letter-spacing: .04em;
  margin-bottom: 3.2rem;
}
.section__title--light { color: var(--paper); margin-bottom: 1.2rem; }

/* ---------- 理念 ---------- */
.philosophy { background: #fff; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.philosophy__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 3.4rem; }
.philosophy__num {
  display: block; font-family: var(--serif); font-size: 2.6rem; font-weight: 600;
  color: var(--paper-dark); -webkit-text-stroke: 1px var(--vermilion); margin-bottom: .8rem;
}
.philosophy__item h3 { font-family: var(--serif); font-size: 1.22rem; margin-bottom: .7rem; letter-spacing: .04em; }
.philosophy__item p { color: var(--ink-soft); font-size: .96rem; }

/* ---------- 核心功能 ---------- */
.features__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.6rem; }
.feature-card {
  background: #fff; border: 1px solid var(--line); border-radius: 18px;
  padding: 2.1rem 1.7rem; transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
}
.feature-card:hover { transform: translateY(-6px); box-shadow: 0 18px 40px rgba(35, 32, 28, .08); border-color: rgba(178, 58, 50, .35); }
.feature-card__icon { width: 52px; height: 52px; border-radius: 14px; background: rgba(178, 58, 50, .08); color: var(--vermilion); display: grid; place-items: center; margin-bottom: 1.3rem; }
.feature-card__icon svg { width: 30px; height: 30px; }
.feature-card h3 { font-family: var(--serif); font-size: 1.14rem; margin-bottom: .6rem; letter-spacing: .05em; }
.feature-card p { color: var(--ink-soft); font-size: .92rem; }

/* ---------- 适合谁 ---------- */
.audience { background: var(--ink); color: var(--paper); }
.audience__grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 4.5rem; align-items: center; }
.audience .section__title { color: var(--paper); }
.audience__copy p { color: rgba(250, 247, 242, .72); max-width: 32em; }
.audience__chips { display: flex; flex-wrap: wrap; gap: .7rem; list-style: none; margin-top: 1.8rem; }
.audience__chips li {
  font-size: .88rem; letter-spacing: .08em; padding: .42rem 1.15rem;
  border: 1px solid rgba(250, 247, 242, .28); border-radius: 999px; color: rgba(250, 247, 242, .85);
  transition: border-color .25s, color .25s;
}
.audience__chips li:hover { border-color: var(--vermilion); color: #fff; }
.audience__quote { border-left: 3px solid var(--vermilion); padding-left: 2rem; }
.audience__quote blockquote { font-family: var(--serif); font-size: 1.3rem; line-height: 2; letter-spacing: .03em; }
.audience__quote figcaption { margin-top: 1.2rem; color: rgba(250, 247, 242, .55); font-size: .9rem; letter-spacing: .1em; }

/* ---------- 用户故事 ---------- */
.stories__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.6rem; }
.story-card {
  background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 2rem 1.8rem;
  display: flex; flex-direction: column; gap: 1.4rem; position: relative;
}
.story-card::before {
  content: "“"; position: absolute; top: .6rem; left: 1.4rem;
  font-family: var(--serif); font-size: 3.2rem; color: rgba(178, 58, 50, .18); line-height: 1;
}
.story-card__text { font-size: .98rem; color: var(--ink); padding-top: 1.4rem; }
.story-card__meta { margin-top: auto; font-size: .82rem; color: var(--ink-soft); letter-spacing: .05em; border-top: 1px dashed var(--line); padding-top: 1rem; }

/* ---------- 下载 ---------- */
.download { background: linear-gradient(135deg, var(--vermilion) 0%, var(--vermilion-deep) 100%); color: #fff; }
.download__inner { display: grid; grid-template-columns: 1.2fr .8fr; gap: 4rem; align-items: center; }
.download__copy p { color: rgba(255, 255, 255, .85); margin-bottom: 2rem; }
.download__actions { display: flex; flex-wrap: wrap; gap: 1rem; }
.store-btn {
  display: flex; align-items: center; gap: .8rem;
  background: rgba(0, 0, 0, .28); border: 1px solid rgba(255, 255, 255, .4);
  border-radius: 12px; padding: .7rem 1.4rem; text-decoration: none; color: #fff;
  transition: background .25s, transform .25s;
}
.store-btn:hover { background: rgba(0, 0, 0, .42); transform: translateY(-2px); }
.store-btn small { display: block; font-size: .68rem; letter-spacing: .06em; opacity: .8; }
.store-btn strong { display: block; font-size: 1.05rem; line-height: 1.2; }
.download__qr { justify-self: center; text-align: center; }
.qr-slot {
  background: #fff; color: var(--ink); border-radius: 18px; padding: 1.4rem 1.6rem;
  display: inline-block; box-shadow: 0 16px 40px rgba(0, 0, 0, .18);
}
.qr-slot svg { margin: 0 auto; color: var(--ink); }
.qr-slot p { margin-top: .7rem; font-size: .86rem; color: var(--ink-soft); letter-spacing: .1em; }
.download__tip { margin-top: .9rem; font-size: .82rem; color: rgba(255, 255, 255, .65); letter-spacing: .08em; }

/* ---------- 页脚 ---------- */
.footer { background: var(--ink); color: rgba(250, 247, 242, .65); padding: 3.4rem 0 2.8rem; }
.footer__inner { display: grid; grid-template-columns: 1.4fr 1fr 1.2fr; gap: 2.5rem; align-items: start; }
.footer__logo { font-family: var(--serif); font-size: 1.4rem; font-weight: 700; color: var(--paper); letter-spacing: .12em; }
.footer__brand p { margin-top: .7rem; font-size: .9rem; }
.footer__links { display: flex; flex-direction: column; gap: .7rem; }
.footer__links a { color: rgba(250, 247, 242, .65); text-decoration: none; font-size: .92rem; transition: color .2s; }
.footer__links a:hover { color: #fff; }
.footer__meta { font-size: .84rem; text-align: right; }
.footer__meta p { margin-bottom: .5rem; }
.beacon { color: rgba(250, 247, 242, .45); }

/* ---------- 进场动效 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .8s ease, transform .8s ease; }
.reveal--visible { opacity: 1; transform: none; }
.delay-1 { transition-delay: .12s; }
.delay-2 { transition-delay: .24s; }
.delay-3 { transition-delay: .36s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .thread { animation: none; stroke-dashoffset: 0; }
  .knot { animation: none; opacity: 1; }
  .btn, .feature-card, .store-btn { transition: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .hero { padding: 140px 0 80px; }
  .hero__grid { grid-template-columns: 1fr; gap: 3rem; }
  .hero__art { max-width: 440px; margin: 0 auto; }
  .features__grid { grid-template-columns: repeat(2, 1fr); }
  .stories__grid { grid-template-columns: 1fr; }
  .audience__grid, .download__inner { grid-template-columns: 1fr; gap: 3rem; }
  .philosophy__grid { grid-template-columns: 1fr; gap: 2.4rem; }
  .footer__inner { grid-template-columns: 1fr; text-align: left; }
  .footer__meta { text-align: left; }
}

@media (max-width: 760px) {
  .nav__links, .nav__cta { display: none; }
  .nav__toggle { display: block; margin-left: auto; }
  .section { padding: 76px 0; }
  .features__grid { grid-template-columns: 1fr; }
  .hero__points { flex-wrap: wrap; gap: 1rem 1.6rem; }
  .download__actions { flex-direction: column; }
  .store-btn { justify-content: center; }
}