/* ═══════════════════════════════════════════
   一念 · DidiApp 官网
   品牌体系：暖阳橙 #E8734A → 阳光黄 #FFB84C
   底色米杏 #FAF6F1 · 文字暖褐黑 #3D2C24
   设计基调：Apple 式极简 + 暖感留白
   ═══════════════════════════════════════════ */

:root{
  --brand:#E8734A;
  --brand-deep:#C9502A;
  --sun:#FFB84C;
  --peach:#FFE3D1;
  --ink:#3D2C24;
  --ink-2:#8A7468;
  --ink-3:#BCA99E;
  --bg:#FAF6F1;
  --card:#FFFFFF;
  --line:#F0E6DD;
  --good:#4CAF7D;
  --r-lg:24px;
  --r-md:18px;
  --r-sm:12px;
  --shadow-lg:0 30px 60px -15px rgba(61,44,36,.18);
  --shadow-sm:0 8px 24px -8px rgba(61,44,36,.12);
  --font:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
}

*{margin:0;padding:0;box-sizing:border-box;-webkit-font-smoothing:antialiased}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  color:var(--ink);
  background:var(--bg);
  line-height:1.7;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
button{font-family:inherit;cursor:pointer}

section{scroll-margin-top:76px}

/* ── 通用文本 ── */
.sec-eyebrow{
  font-size:13px;font-weight:700;letter-spacing:.22em;
  color:var(--brand);text-transform:uppercase;margin-bottom:14px;
}
.sec-title{
  font-size:clamp(28px,4vw,44px);font-weight:800;line-height:1.25;
  letter-spacing:.5px;margin-bottom:20px;
}
.sec-lead{font-size:clamp(15px,1.6vw,18px);color:var(--ink-2);max-width:640px}
.sec-body{font-size:16px;color:var(--ink-2);margin-bottom:16px;max-width:560px}

/* ── 按钮 ── */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:14px 30px;border-radius:999px;
  font-size:15px;font-weight:700;letter-spacing:.4px;
  transition:transform .25s ease,box-shadow .25s ease,background .25s ease;
  border:1px solid transparent;
}
.btn-primary{
  background:linear-gradient(135deg,var(--brand),var(--sun));
  color:#fff;box-shadow:0 12px 30px -8px rgba(232,115,74,.5);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 40px -8px rgba(232,115,74,.6)}
.btn-ghost{background:transparent;border-color:rgba(61,44,36,.18);color:var(--ink)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}
.btn-lg{padding:16px 38px;font-size:17px}
.btn-icon{font-size:18px;line-height:1}

/* ═══════════ 导航 ═══════════ */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  transition:background .35s ease,box-shadow .35s ease,backdrop-filter .35s ease;
}
.nav.scrolled{
  background:rgba(250,246,241,.82);
  backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  box-shadow:0 1px 0 rgba(61,44,36,.06);
}
.nav-inner{
  max-width:1200px;margin:0 auto;padding:14px 24px;
  display:flex;align-items:center;justify-content:space-between;
}
.nav-brand{display:flex;align-items:center;gap:10px}
.nav-logo{width:36px;height:36px;border-radius:10px}
.nav-brand-name{font-size:20px;font-weight:800;letter-spacing:2px}
.nav-links{display:flex;align-items:center;gap:32px}
.nav-links a{font-size:15px;font-weight:500;color:var(--ink-2);transition:color .2s}
.nav-links a:hover{color:var(--brand)}
.nav-links .nav-cta{
  color:var(--brand);font-weight:700;
  border:1.5px solid var(--brand);border-radius:999px;padding:8px 20px;
  transition:background .25s,color .25s;
}
.nav-links .nav-cta:hover{background:var(--brand);color:#fff}
.nav-burger{display:none;background:none;border:none;flex-direction:column;gap:5px;padding:6px}
.nav-burger span{width:22px;height:2px;background:var(--ink);border-radius:2px;transition:transform .3s,opacity .3s}
.nav-burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-burger.open span:nth-child(2){opacity:0}
.nav-burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ═══════════ Hero ═══════════ */
.hero{
  position:relative;
  padding:140px 24px 110px;
  background:linear-gradient(175deg,#FFF7F0 0%,var(--bg) 60%);
  overflow:hidden;
}
.hero-bg{position:absolute;inset:0;pointer-events:none}
.hero-glow{
  position:absolute;top:-180px;right:-120px;width:680px;height:680px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,184,76,.28),rgba(255,227,209,0) 70%);
}
.hero-enso{
  position:absolute;border-radius:50%;
  border:2px solid rgba(232,115,74,.14);
}
.enso-1{width:420px;height:420px;top:-120px;left:-120px}
.enso-2{width:260px;height:260px;bottom:30px;left:46%;border-color:rgba(255,184,76,.16)}
.hero-inner{
  max-width:1200px;margin:0 auto;position:relative;z-index:2;
  display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;
}
.hero-eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:700;letter-spacing:.18em;color:var(--brand);
  background:rgba(232,115,74,.08);border:1px solid rgba(232,115,74,.18);
  padding:7px 16px;border-radius:999px;margin-bottom:22px;
}
.hero-title{
  font-size:clamp(38px,5.4vw,64px);font-weight:900;line-height:1.15;
  letter-spacing:1px;margin-bottom:22px;
}
.hero-sub{font-size:clamp(15px,1.7vw,18px);color:var(--ink-2);margin-bottom:34px;max-width:520px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:34px}
.hero-meta{list-style:none;display:flex;flex-wrap:wrap;gap:18px}
.hero-meta li{display:flex;align-items:center;gap:7px;font-size:13px;color:var(--ink-3)}
.dot{width:7px;height:7px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--sun))}

/* ── Hero 手机 ── */
.hero-visual{position:relative;display:flex;justify-content:center}
.phone{
  width:290px;background:#1B1512;border-radius:42px;padding:10px;
  box-shadow:0 40px 80px -20px rgba(61,44,36,.35),0 0 0 1px rgba(255,255,255,.08);
  position:relative;z-index:2;
  animation:float 6s ease-in-out infinite;
}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-14px)}}
.phone-notch{
  width:110px;height:24px;background:#000;border-radius:0 0 16px 16px;
  position:absolute;top:0;left:50%;transform:translateX(-50%);z-index:3;
}
.phone-screen{
  background:linear-gradient(180deg,#FFF9F3,#FAF6F1);
  border-radius:34px;padding:38px 18px 20px;min-height:560px;
  display:flex;flex-direction:column;gap:14px;
}
.scr-top{display:flex;align-items:center;gap:10px}
.scr-avatar{width:44px;height:44px;border-radius:50%;overflow:hidden;background:#FFE3D1;display:flex;align-items:center;justify-content:center}
.scr-avatar img{width:26px;height:26px}
.scr-user{flex:1}
.scr-user b{display:block;font-size:15px}
.scr-user small{font-size:11px;color:var(--ink-3)}
.scr-heart{font-size:18px;color:var(--brand)}
.scr-greeting{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-md);
  padding:12px 14px;font-size:13px;box-shadow:var(--shadow-sm);
}
.greet-sun{margin-right:6px}
.scr-card{
  background:linear-gradient(135deg,var(--brand),var(--sun));
  border-radius:var(--r-md);color:#fff;padding:16px;
  display:flex;align-items:center;gap:14px;box-shadow:0 14px 30px -10px rgba(232,115,74,.5);
}
.card-ring{
  width:46px;height:46px;border-radius:50%;flex:0 0 46px;
  border:2px dashed rgba(255,255,255,.65);
  position:relative;
}
.card-ring::after{
  content:"";position:absolute;inset:6px;border-radius:50%;
  border:2px solid rgba(255,255,255,.85);
}
.card-body b{display:block;font-size:13px;font-weight:600}
.card-body em{display:block;font-size:24px;font-weight:900;font-style:normal;line-height:1.2}
.card-body small{font-size:11px;opacity:.9}
.scr-streak{display:flex;justify-content:space-between;gap:6px}
.streak-item{
  flex:1;text-align:center;padding:8px 0;border-radius:var(--r-sm);
  font-size:12px;background:#fff;border:1px solid var(--line);color:var(--ink-3);
}
.streak-item.on{color:var(--brand);border-color:rgba(232,115,74,.35);background:#FFF3EC}
.streak-item.today{
  background:linear-gradient(135deg,var(--brand),var(--sun));color:#fff;
  border-color:transparent;font-weight:800;
}
.scr-actions{display:flex;gap:10px;margin-top:auto}
.act{
  flex:1;text-align:center;padding:10px 6px;font-size:12px;font-weight:600;
  background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);
  box-shadow:var(--shadow-sm);
}
.float-badge{
  position:absolute;background:#fff;border-radius:var(--r-md);
  box-shadow:var(--shadow-lg);padding:10px 14px;z-index:3;
  font-size:12px;color:var(--ink-2);
  border:1px solid var(--line);
}
.float-badge b{color:var(--brand);font-size:16px}
.float-badge small{display:block;color:var(--ink-3);font-size:11px}
.badge-a{top:24%;right:-4px;animation:float 5s ease-in-out .6s infinite}
.badge-b{bottom:16%;left:-10px;animation:float 5.5s ease-in-out 1.2s infinite}

.hero-wave{position:absolute;bottom:-1px;left:0;right:0;line-height:0;z-index:1}
.hero-wave svg{width:100%;height:90px}

/* ═══════════ 品牌理念 ═══════════ */
.philosophy{padding:120px 24px}
.philosophy-inner{
  max-width:1080px;margin:0 auto;
  display:grid;grid-template-columns:1fr 1.1fr;gap:64px;align-items:center;
}
.philosophy-visual{display:flex;justify-content:center}
.enso-big{width:min(340px,80vw);aspect-ratio:1;position:relative}
.enso-big svg{width:100%;height:100%}
.enso-big::before{
  content:"";position:absolute;inset:0;border-radius:50%;
  background:radial-gradient(circle,rgba(255,227,209,.55),rgba(255,227,209,0) 70%);
}
.philosophy-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
.tag{
  font-size:12.5px;padding:6px 14px;border-radius:999px;
  background:#fff;border:1px solid var(--line);color:var(--ink-2);
}

/* ═══════════ 核心功能 ═══════════ */
.features{padding:110px 24px;background:#fff}
.features-head{max-width:1080px;margin:0 auto 56px;text-align:center}
.features-head .sec-eyebrow{display:block}
.features-head .sec-title{margin-bottom:12px}
.features-head .sec-lead{margin:0 auto}
.features-grid{
  max-width:1080px;margin:0 auto;
  display:grid;grid-template-columns:repeat(3,1fr);gap:24px;
}
.f-card{
  background:var(--bg);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:34px 28px;transition:transform .3s ease,box-shadow .3s ease,border-color .3s;
}
.f-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:rgba(232,115,74,.25)}
.f-icon{
  width:56px;height:56px;border-radius:16px;margin-bottom:20px;
  background:color-mix(in srgb,var(--ic) 12%,#fff);
  border:1px solid color-mix(in srgb,var(--ic) 22%,#fff);
  display:flex;align-items:center;justify-content:center;
}
.f-svg{font-size:26px;color:var(--ic);line-height:1}
.f-card h3{font-size:19px;font-weight:800;margin-bottom:10px}
.f-card p{font-size:14.5px;color:var(--ink-2)}

/* ═══════════ 陪伴体系 ═══════════ */
.companion{
  position:relative;padding:130px 24px;overflow:hidden;
  background:linear-gradient(160deg,#2A211C 0%,#3D2C24 60%,#4A352A 100%);
  color:#F7EFE8;
}
.companion-bg{
  position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(600px 300px at 85% 20%,rgba(255,184,76,.12),transparent 70%),
    radial-gradient(500px 260px at 12% 80%,rgba(232,115,74,.14),transparent 70%);
}
.companion-inner{max-width:1080px;margin:0 auto;position:relative;z-index:2}
.companion-copy{margin-bottom:56px}
.companion-copy .sec-eyebrow{color:var(--sun)}
.companion-copy .sec-body{color:#CBB9AC}
.companion-stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:20px;
}
.stat{
  background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);
  border-radius:var(--r-lg);padding:30px 22px;text-align:center;
  backdrop-filter:blur(8px);
  transition:transform .3s ease,background .3s;
}
.stat:hover{transform:translateY(-5px);background:rgba(255,255,255,.09)}
.stat-num{
  font-size:46px;font-weight:900;
  background:linear-gradient(135deg,var(--sun),var(--brand));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.stat-unit{font-size:18px;font-weight:700;color:var(--sun);margin-left:4px}
.stat small{display:block;margin-top:6px;font-size:13px;color:#CBB9AC}
.companion-note{margin-top:52px;text-align:center;font-size:15px;color:#CBB9AC;letter-spacing:2px}

/* ═══════════ 下载 ═══════════ */
.download{padding:120px 24px}
.download-card{
  max-width:900px;margin:0 auto;background:#fff;
  border-radius:32px;padding:56px;display:flex;gap:44px;align-items:center;
  box-shadow:var(--shadow-lg);border:1px solid var(--line);
}
.dl-icon{
  width:150px;height:150px;border-radius:32px;flex:0 0 150px;
  box-shadow:var(--shadow-lg);
}
.dl-info .sec-title{margin-bottom:8px;font-size:34px}
.dl-info .sec-lead{margin-bottom:22px}
.dl-specs{list-style:none;display:flex;flex-wrap:wrap;gap:14px;margin-bottom:28px}
.dl-specs li{
  font-size:13px;color:var(--ink-2);background:var(--bg);
  border:1px solid var(--line);padding:7px 14px;border-radius:999px;
}
.dl-specs b{color:var(--ink);margin-right:5px}
.dl-note{margin-top:14px;font-size:12.5px;color:var(--ink-3)}

/* ═══════════ Footer ═══════════ */
.footer{background:#2A211C;color:#CBB9AC}
.footer-inner{
  max-width:1080px;margin:0 auto;padding:70px 24px 40px;
  display:grid;grid-template-columns:1.2fr 1.8fr;gap:48px;
}
.footer-brand img{width:44px;height:44px;border-radius:12px;margin-bottom:14px}
.footer-brand p{font-size:14px;line-height:1.9}
.footer-links{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.fcol h4{color:#F7EFE8;font-size:14px;margin-bottom:16px;letter-spacing:1px}
.fcol a{display:block;font-size:13.5px;margin-bottom:10px;transition:color .2s}
.fcol a:hover{color:var(--sun)}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.08);
  padding:22px 24px;text-align:center;font-size:12.5px;color:#8F7B6D;
}

/* ── 滚动显现 ── */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ═══════════ 响应式 ═══════════ */
@media (max-width:960px){
  .hero-inner{grid-template-columns:1fr;gap:56px;text-align:center}
  .hero-actions,.hero-meta{justify-content:center}
  .hero-sub{margin-left:auto;margin-right:auto}
  .philosophy-inner{grid-template-columns:1fr;gap:44px;text-align:center}
  .philosophy-tags{justify-content:center}
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .companion-stats{grid-template-columns:repeat(2,1fr)}
  .footer-inner{grid-template-columns:1fr;gap:36px}
  .download-card{flex-direction:column;text-align:center;padding:44px 28px}
  .dl-specs{justify-content:center}
}
@media (max-width:680px){
  .nav-links{
    position:fixed;top:0;right:-100%;width:min(300px,80vw);height:100vh;
    background:#fff;flex-direction:column;gap:26px;padding:100px 34px;
    box-shadow:-20px 0 50px rgba(61,44,36,.15);
    transition:right .35s ease;z-index:99;
  }
  .nav-links.open{right:0}
  .nav-burger{display:flex}
  .features-grid{grid-template-columns:1fr}
  .companion-stats{grid-template-columns:1fr 1fr}
  .hero{padding-top:110px}
  .badge-a{right:0}
  .badge-b{left:0}
  .footer-links{grid-template-columns:1fr 1fr}
}