/* =========================================================
   SnipDot
   主色取自 App 图标那支蓝。产品气质是「克制」，所以蓝只用在
   该用的地方 —— 按钮、强调、深色区，其余交给黑白灰和留白。
   ========================================================= */

:root {
  color-scheme: light;

  --paper:   #ffffff;
  --tint:    #f4f7fb;   /* 蓝调浅灰，分区用 */
  --deep:    #0e2338;   /* 深蓝墨 */
  --deep-2:  #14304a;

  --ink:     #101828;
  --muted:   #5b6472;
  --faint:   #8b95a3;
  --line:    rgba(14, 35, 56, 0.10);

  --blue:      #2b7fe0;   /* 图标蓝 */
  --blue-deep: #1b62c9;
  --blue-soft: #e8f1fc;
  --red:       #e5484d;
  --green:     #30a46c;

  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
          "Helvetica Neue", "Segoe UI", system-ui, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;

  --edge: clamp(20px, 5vw, 64px);
  --maxw: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-width: 320px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.5;
  letter-spacing: -0.011em;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
h1, h2, h3, p, figure { margin: 0; }
/* height:auto 不能少。HTML 上写了 width/height 属性（为了预留位置、避免抖动），
   只约束宽度的话，浏览器会拿属性里的高度当固定值 —— 图会被拉变形。 */
img { max-width: 100%; height: auto; display: block; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--edge); }

/* ── 导航 ───────────────────────────────────────────── */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s;
}
.nav.stuck { border-bottom-color: var(--line); }

.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--edge);
  height: 58px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.022em;
}
.mark { border-radius: 7px; }

.nav-links {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 14.5px;
}
.nav-links .sec { color: var(--muted); transition: color .2s; }
.nav-links .sec:hover { color: var(--ink); }
.nav-links .lang { color: var(--muted); }
.nav-links .lang:hover { color: var(--ink); }
.nav-links .pill {
  padding: 8px 18px;
  border-radius: 980px;
  background: var(--blue);
  color: #fff;
  font-weight: 500;
  transition: background .2s;
}
.nav-links .pill:hover { background: var(--blue-deep); }

@media (max-width: 620px) {
  .nav-links { gap: 16px; font-size: 13.5px; }
  .nav-links .sec:nth-child(2) { display: none; }
}

/* ── 首屏：标题在上，整图在下 ───────────────────────── */

.hero {
  text-align: center;
  padding: clamp(56px, 9vw, 104px) 0 0;
}

.hero h1 {
  font-size: clamp(38px, 6.2vw, 72px);
  line-height: 1.04;
  font-weight: 700;
  letter-spacing: -0.04em;
  max-width: 16ch;
  margin: 0 auto;
}

/* 轮换行：产品性格靠这几句立住 —— 它拒绝做什么 */
.rotator {
  margin: 24px auto 0;
  height: 1.6em;
  font-size: clamp(17px, 2.1vw, 21px);
  color: var(--muted);
  position: relative;
}
.rotator b {
  position: absolute;
  inset: 0;
  font-weight: 500;
  color: var(--blue);
  opacity: 0;
  animation: rotate 15s infinite;
}
.rotator b:nth-child(1) { animation-delay: 0s }
.rotator b:nth-child(2) { animation-delay: 3s }
.rotator b:nth-child(3) { animation-delay: 6s }
.rotator b:nth-child(4) { animation-delay: 9s }
.rotator b:nth-child(5) { animation-delay: 12s }

@keyframes rotate {
  0%, 2%    { opacity: 0; transform: translateY(8px) }
  5%, 18%   { opacity: 1; transform: none }
  21%, 100% { opacity: 0; transform: translateY(-8px) }
}

.hero-actions {
  margin-top: 32px;
  display: flex;
  gap: 14px;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 13px 28px;
  border-radius: 980px;
  font-size: 16px;
  font-weight: 500;
  transition: transform .15s, background .2s, border-color .2s, color .2s;
}
.btn:active { transform: scale(.97) }

.btn-primary { background: var(--blue); color: #fff; border: 1px solid var(--blue); }
.btn-primary:hover { background: var(--blue-deep); border-color: var(--blue-deep); }

.btn-line { color: var(--ink); border: 1px solid var(--line); background: var(--paper); }
.btn-line:hover { border-color: rgba(14,35,56,.24) }

.btn-white { background: #fff; color: var(--deep); border: 1px solid #fff; }
.btn-white:hover { background: rgba(255,255,255,.9) }

.chev { transition: transform .2s }
.btn:hover .chev { transform: translateX(3px) }

.hero-note { margin-top: 16px; font-size: 13.5px; color: var(--faint) }

/* 产品图：完整呈现，不裁不压。图自带底色与投影，所以这里只负责给它空间 */
.hero-shot {
  max-width: 1120px;
  margin: clamp(44px, 6vw, 76px) auto 0;
  padding: 0 var(--edge);
}
.hero-shot img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;   /* 图就是 16:9，写死可防任何情况下的变形 */
  object-fit: contain;
  border-radius: 16px;
  box-shadow: 0 2px 6px rgba(14,35,56,.05), 0 24px 60px rgba(14,35,56,.12);
}

/* ── 通用区块 ───────────────────────────────────────── */

.section { padding: clamp(64px, 9vw, 116px) 0 }
.section.tint { background: var(--tint) }

.eyebrow {
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 14px;
}

.section-head { max-width: 660px; margin-bottom: clamp(38px, 5vw, 58px) }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center }

.section-head h2 {
  font-size: clamp(29px, 4.2vw, 47px);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.11;
}
.section-head p {
  margin-top: 15px;
  color: var(--muted);
  font-size: clamp(16px, 1.85vw, 18.5px);
  line-height: 1.56;
}

/* ── 功能网格 ───────────────────────────────────────── */

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(276px, 1fr));
  gap: clamp(22px, 2.8vw, 38px);
}

.panel .ico {
  width: 42px; height: 42px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: var(--blue-soft);
  color: var(--blue);
  margin-bottom: 18px;
}
.panel .ico svg { width: 21px; height: 21px }

.panel h3 { font-size: 20px; font-weight: 600; letter-spacing: -0.022em }
.panel p { margin-top: 10px; color: var(--muted); font-size: 15.5px; line-height: 1.62 }

code {
  font-family: var(--mono);
  font-size: .82em;
  padding: 2px 6px;
  border-radius: 6px;
  background: rgba(14,35,56,.06);
}

/* ── 「拒绝做什么」：深蓝墨区，本站的立场所在 ────────── */

.refuse { background: var(--deep); color: #fff }
.refuse .section-head h2 { color: #fff }
.refuse .section-head p { color: rgba(255,255,255,.6) }
.refuse .eyebrow { color: #7db4f0 }
.refuse code { background: rgba(255,255,255,.12); color: #cfe2f7 }

.refuse-list { border-top: 1px solid rgba(255,255,255,.13) }

.refuse-row {
  display: grid;
  grid-template-columns: minmax(190px, 320px) 1fr;
  gap: clamp(14px, 4vw, 56px);
  padding: clamp(24px, 3.2vw, 36px) 0;
  border-bottom: 1px solid rgba(255,255,255,.13);
  align-items: baseline;
}
.refuse-row h3 {
  font-size: clamp(21px, 2.5vw, 29px);
  font-weight: 600;
  letter-spacing: -0.03em;
  display: flex;
  align-items: baseline;
  gap: 13px;
}
.refuse-row h3::before {
  content: "";
  width: 9px; height: 9px;
  flex: none;
  border-radius: 50%;
  background: var(--red);
  transform: translateY(-3px);
}
.refuse-row p {
  color: rgba(255,255,255,.64);
  font-size: 16px;
  line-height: 1.62;
  max-width: 56ch;
}
@media (max-width: 660px) {
  .refuse-row { grid-template-columns: 1fr; gap: 10px }
}

/* ── 快捷键 ─────────────────────────────────────────── */

.keys {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(330px, 1fr));
  gap: 0 clamp(24px, 4vw, 64px);
}
.key-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
}
kbd {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  min-width: 48px;
  padding: 5px 10px;
  text-align: center;
  border-radius: 8px;
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: 0 1.5px 0 rgba(14,35,56,.08);
  flex: none;
}
kbd.inline { min-width: 0; padding: 3px 7px; font-size: 12px }
.key-row span { color: var(--muted) }

/* ── 隐私 ───────────────────────────────────────────── */

.verify {
  margin-top: 26px;
  background: var(--deep);
  color: #dce7f2;
  border-radius: 14px;
  padding: 22px 24px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.75;
  overflow-x: auto;
}
.verify .c { color: #6d8aa6 }
.verify .g { color: #5fd39a }

.fineprint { margin-top: 18px; color: var(--faint); font-size: 14.5px }
.fineprint a { color: var(--blue) }

/* ── 语言 ───────────────────────────────────────────── */

.langs { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center }
.langs b {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 980px;
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 500;
}

/* ── 收尾 ───────────────────────────────────────────── */

.closer {
  background: var(--blue);
  color: #fff;
  text-align: center;
  padding: clamp(62px, 9vw, 106px) 0;
}
.closer h2 {
  font-size: clamp(27px, 4vw, 44px);
  font-weight: 700;
  letter-spacing: -0.035em;
  max-width: 19ch;
  margin: 0 auto;
}
.closer p { margin-top: 15px; color: rgba(255,255,255,.85); font-size: 17px }
.closer .btn { margin-top: 30px }

/* ── 页脚 ───────────────────────────────────────────── */

.foot { border-top: 1px solid var(--line); padding: 30px 0 46px; font-size: 13.5px; color: var(--faint) }
.foot-inner { display: flex; flex-wrap: wrap; gap: 8px 22px; align-items: center }
.foot a { color: var(--muted) }
.foot a:hover { color: var(--ink) }
.foot .spacer { margin-left: auto }

/* ── 入场 ───────────────────────────────────────────── */

/* 用 backwards 而不是 both：动画一结束元素就回到自身样式（可见）。
   both 会让它停在最后一帧，万一动画根本没播（截图工具、省电模式、
   某些浏览器），内容就永久停在 opacity:0 —— 整个首屏是空白的。 */
.rise { animation: rise .72s cubic-bezier(.16,1,.3,1) backwards }
.d2 { animation-delay: .06s } .d3 { animation-delay: .12s }
.d4 { animation-delay: .18s } .d5 { animation-delay: .24s }
@keyframes rise { from { opacity: 0; transform: translateY(16px) } to { opacity: 1; transform: none } }

@media (prefers-reduced-motion: reduce) {
  .rise, .rotator b { animation: none }
  .rotator b:first-child { opacity: 1 }
  html { scroll-behavior: auto }
}

/* ── 正文页 ─────────────────────────────────────────── */

.prose { max-width: 720px; margin: 0 auto; padding: clamp(44px, 7vw, 80px) var(--edge) 64px }
.prose h1 { font-size: clamp(31px, 4.4vw, 44px); font-weight: 700; letter-spacing: -.035em }
.prose .updated { margin-top: 10px; color: var(--faint); font-size: 14px }
.prose h2 { margin-top: 40px; font-size: 21px; font-weight: 600; letter-spacing: -.02em }
.prose p { margin-top: 13px; color: var(--muted); line-height: 1.68 }
.prose ul { margin-top: 13px; padding-left: 20px; color: var(--muted); line-height: 1.8 }
.prose strong { color: var(--ink); font-weight: 600 }