/* 首页专用样式 */
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
section{position:relative}
h1.brand-title{font:600 clamp(48px,9vw,72px)/1.1 "Songti SC","STSong","Noto Serif SC",Georgia,serif;letter-spacing:.1em;margin:20px 0 6px}
h2.sec,.tagline{text-wrap:balance}
h2.sec{font:600 clamp(26px,4.6vw,38px)/1.3 "Songti SC","STSong","Noto Serif SC",Georgia,serif;margin:0 0 14px;letter-spacing:.02em}
p.lead{font-size:clamp(17px,2.4vw,20px);color:var(--muted);margin:0}

/* 首屏 */
.hero{padding:24px 0 72px}
.hero .wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.hero-icon{width:84px;height:84px;border-radius:20px;box-shadow:0 14px 32px var(--shadow)}
.tagline{font-size:clamp(20px,3.2vw,26px);margin:0 0 10px;color:var(--fg)}
.sub{color:var(--muted);margin:0 0 28px;font-size:15px}
.dl{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:50px;padding:0 30px;border-radius:999px;background:var(--fg);color:var(--bg);font-weight:600;letter-spacing:.05em;font-size:16px;border:0}
.dl[aria-disabled="true"]{opacity:.5;cursor:default;pointer-events:none}
.dl:hover{text-decoration:none}
.dl-note{display:block;margin-top:10px;font-size:13px;color:var(--muted)}

/* iPhone 外框（纯 CSS） */
.phone{position:relative;width:min(280px,72vw);aspect-ratio:1206/2622;margin:0 auto;border-radius:42px;padding:7px;background:#1C1B19;box-shadow:0 30px 60px var(--shadow),inset 0 0 0 1.5px #3a3835}
.phone .screen{width:100%;height:100%;border-radius:35px;overflow:hidden;background:#EDE6D9}
.phone .screen img,.phone .screen video{display:block;width:100%;height:100%;object-fit:cover}
.phone.sm{width:100%;border-radius:26px;padding:4px;box-shadow:0 14px 30px var(--shadow)}.phone.sm .screen{border-radius:22px}

/* 核心卖点 */
.feature{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center;padding:64px 0}
.feature .text{max-width:440px}
.feature:nth-of-type(even) .media{order:-1}
.feature .shot{border-radius:22px;overflow:hidden;box-shadow:0 20px 44px var(--shadow);border:.5px solid var(--line);background:var(--paper)}
.feature .shot img{display:block;width:100%}
.kicker{font-size:13px;letter-spacing:.2em;color:var(--accent);margin:0 0 10px;font-weight:600}

/* 练得顺手：2×2 小卡片 */
.handy{padding:56px 0 24px}
.handy .wrap>.lead{margin-bottom:26px}
.handy-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.handy .card{display:flex;gap:16px;align-items:flex-start;background:var(--paper);border:.5px solid var(--line);border-radius:22px;padding:22px;box-shadow:0 8px 24px var(--shadow)}
.handy .ico{flex:0 0 44px;width:44px;height:44px;border-radius:14px;display:grid;place-items:center;background:color-mix(in srgb,var(--accent) 14%,transparent);color:var(--accent)}
.handy .ico svg{width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.handy .card p{margin:0;color:var(--muted);font-size:15.5px}
.handy .card strong{display:block;color:var(--fg);font-size:17px;margin-bottom:2px}

/* 主题 */
.themes{padding:64px 0}
.themes-head{max-width:560px;margin:0 auto 32px;text-align:center}
.themes-row{display:flex;gap:18px;overflow-x:auto;scroll-snap-type:x proximity;padding:14px 4px 26px;justify-content:safe center}
.theme{flex:0 0 150px;scroll-snap-align:center;text-align:center}
.theme .name{margin-top:12px;font-size:14px;color:var(--muted);letter-spacing:.08em}
/* 至尊流光：黑金底色 + 流光动效（纯 CSS） */
.theme.aurum{background:#0E0D0B;border:1px solid rgba(201,164,92,.55);border-radius:30px;padding:14px 12px 16px;margin:-14px -4px -14px 0;box-shadow:0 24px 50px rgba(0,0,0,.35)}
.theme.aurum .phone{background:linear-gradient(135deg,#8C6A2E,#E8CC8A,#B08A45);box-shadow:0 0 0 1px rgba(232,204,138,.4)}
.theme.aurum .screen{position:relative}
.theme.aurum .screen::after{content:"";position:absolute;inset:0;background:linear-gradient(115deg,transparent 40%,rgba(248,230,176,.55) 50%,transparent 60%);background-size:260% 100%;background-position:130% 0;animation:sweep 4s ease-in-out infinite;pointer-events:none}
.theme.aurum .name{font-weight:600;background:linear-gradient(110deg,#8C6A2E 25%,#F8E6B0 45%,#B08A45 65%);background-size:260% 100%;-webkit-background-clip:text;background-clip:text;color:transparent;animation:gold 4s ease-in-out infinite}
@keyframes sweep{0%,35%{background-position:130% 0}70%,100%{background-position:-30% 0}}
@keyframes gold{0%,35%{background-position:110% 0}70%,100%{background-position:-10% 0}}

/* 隐私承诺 */
.privacy{padding:64px 0}
.privacy .box{background:var(--paper);border:.5px solid var(--line);border-radius:28px;padding:44px 40px;box-shadow:0 12px 36px var(--shadow)}
.points{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:28px}
.point{padding-top:18px;border-top:1.5px solid var(--accent)}
.point strong{display:block;font-size:17px;margin-bottom:4px}
.point span{color:var(--muted);font-size:15px}

/* 常见问题 */
.faq{padding:40px 0 72px;max-width:760px}
.faq h2{margin-bottom:20px}
details{border-bottom:1px solid var(--line);padding:4px 0}
summary{cursor:pointer;list-style:none;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 0;font-weight:600;font-size:17px;min-height:48px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font-weight:300;font-size:26px;color:var(--accent);line-height:1;flex:0 0 auto;transition:transform .2s}
details[open] summary::after{transform:rotate(45deg)}
details p{margin:0 0 16px;color:var(--muted);font-size:15.5px}

/* 手机 */
@media (max-width:820px){
  .hero{padding:8px 0 48px}
  .hero .wrap{grid-template-columns:1fr;gap:36px;text-align:center}
  .hero .text{display:flex;flex-direction:column;align-items:center}
  .feature{grid-template-columns:1fr;gap:28px;padding:44px 0}
  .feature .text{max-width:none}
  .feature:nth-of-type(even) .media{order:0}
  .points{grid-template-columns:1fr;gap:16px}
  .handy-grid{grid-template-columns:1fr}
  .privacy .box{padding:30px 22px}
  .themes-row{justify-content:flex-start;margin:0 -20px;padding-left:20px;padding-right:20px}
  .site-header nav a:not(:first-child){display:none}
}
@media (prefers-reduced-motion:reduce){
  .theme.aurum .screen::after{animation:none;background:none}
  .theme.aurum .name{animation:none;background-position:50% 0}
  summary::after{transition:none}
}