/* ══════════════════════════════════════════════════════════════
   边打边译 · TransBoard — 官网样式
   设计系统：
     色彩   纸 #FAF9F7 / 墨 #16161A / 品牌蓝 #0A6CFF（取自 App 图标）
     字体   标题 宋体（Songti SC）— 排印质感；正文 系统无衬线；标签 等宽
     间距   8pt 基准
     圆角   10 / 18 / 28（对齐系统 UI）
     动效   cubic-bezier(.2,.8,.2,1)，220–520ms
   ══════════════════════════════════════════════════════════════ */

:root {
  --paper:      #FAF9F7;
  --paper-2:    #F3F1EC;
  --ink:        #16161A;
  --ink-2:      #5C5C63;
  --ink-3:      #8A8A90;
  --line:       #E4E1DB;
  --brand:      #0A6CFF;
  --brand-dark: #0955C8;
  --night:      #141416;

  --serif: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", "SimSun", serif;
  --sans:  -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono:  "SF Mono", "JetBrains Mono", ui-monospace, "Menlo", monospace;

  --ease: cubic-bezier(.2,.8,.2,1);
  --pad: clamp(20px, 4vw, 40px);
  --max: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-wrap: pretty;
}

/* 极淡的纸纹，避免大面积纯色的塑料感 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: .028;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}

main, .nav, .foot { position: relative; z-index: 1; }

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

a { color: inherit; text-decoration: none; }

code, kbd {
  font-family: var(--mono);
  font-size: .88em;
}
code {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: .08em .38em;
  color: var(--ink);
}
kbd {
  display: inline-block;
  min-width: 1.6em;
  text-align: center;
  background: #fff;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: .05em .35em;
  font-size: .82em;
  color: var(--ink);
  line-height: 1.5;
}

/* ─────────────── 通用排版元件 ─────────────── */

.eyebrow {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 18px;
}

h1, h2, h3 { font-family: var(--serif); font-weight: 400; letter-spacing: -.015em; }

.section-head { max-width: 720px; margin-bottom: clamp(40px, 6vw, 72px); }
.section-head h2 {
  font-size: clamp(30px, 4.2vw, 52px);
  line-height: 1.18;
  margin: 0 0 18px;
}
.section-lede {
  font-size: clamp(15px, 1.5vw, 17.5px);
  color: var(--ink-2);
  margin: 0;
  max-width: min(58ch, 100%);
}

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

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 14px var(--pad);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease), background .3s var(--ease);
}
.nav.is-stuck {
  border-bottom-color: var(--line);
  background: color-mix(in srgb, var(--paper) 94%, transparent);
}

.brand { display: flex; align-items: center; gap: 9px; margin-right: auto; }
.brand img { border-radius: 6px; }
.brand-cn { font-family: var(--serif); font-size: 17px; letter-spacing: .02em; }
.brand-en {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .1em;
  color: var(--ink-3);
  padding-left: 9px;
  border-left: 1px solid var(--line);
}

.nav-links { display: flex; gap: 26px; }
.nav-links a {
  font-size: 14px;
  color: var(--ink-2);
  position: relative;
  padding: 2px 0;
  transition: color .2s var(--ease);
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%; bottom: -2px;
  height: 1px;
  background: var(--ink);
  transition: right .28s var(--ease);
}
.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after { right: 0; }

.nav-cta {
  font-size: 13.5px;
  padding: 7px 16px;
  border-radius: 999px;
  background: var(--ink);
  color: var(--paper);
  transition: transform .2s var(--ease), background .2s var(--ease);
}
.nav-cta:hover { background: #000; transform: translateY(-1px); }

/* ─────────────── Hero ─────────────── */

.hero {
  padding: clamp(56px, 9vw, 112px) var(--pad) clamp(64px, 8vw, 104px);
}
.hero-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
}

.hero-copy h1 {
  font-size: clamp(46px, 7.4vw, 96px);
  line-height: 1.02;
  margin: 0 0 26px;
  letter-spacing: -.03em;
}
.hero-copy h1 em {
  font-style: normal;
  color: var(--brand);
}

.lede {
  font-size: clamp(15.5px, 1.6vw, 18px);
  color: var(--ink-2);
  max-width: min(34ch, 100%);
  margin: 0 0 34px;
}
.lede kbd { margin: 0 1px; }

.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 22px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  padding: 12px 24px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform .18s var(--ease), background .2s var(--ease), border-color .2s var(--ease), box-shadow .25s var(--ease);
}
.btn-primary {
  background: var(--ink);
  color: var(--paper);
  box-shadow: 0 1px 2px rgba(0,0,0,.16), 0 8px 24px -12px rgba(22,22,26,.5);
}
.btn-primary:hover { background: #000; transform: translateY(-1.5px); box-shadow: 0 2px 4px rgba(0,0,0,.14), 0 14px 32px -14px rgba(22,22,26,.55); }
.btn-primary:active { transform: translateY(0); }
.btn-ghost {
  border-color: var(--line);
  color: var(--ink);
  background: #fff;
}
.btn-ghost:hover { border-color: #CFCBC3; transform: translateY(-1.5px); }
.btn-wide { width: 100%; }

.hero-foot {
  font-size: 12.5px;
  color: var(--ink-3);
  margin: 0;
  font-family: var(--mono);
  letter-spacing: .02em;
}

/* —— 演示卡 —— */

.hero-stage { position: relative; display: flex; justify-content: flex-end; min-width: 0; }
.stage-glow {
  position: absolute;
  inset: 8% 0% -10% 0%;
  background: radial-gradient(58% 58% at 50% 46%, rgba(10,108,255,.20), transparent 72%);
  filter: blur(34px);
  z-index: 0;
  pointer-events: none;
}

.composer {
  position: relative;
  z-index: 1;
  width: 100%;
  min-width: 0;
  max-width: 700px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 20px 20px 18px;
  box-shadow:
    0 1px 2px rgba(22,22,26,.05),
    0 10px 26px -18px rgba(22,22,26,.28),
    0 40px 70px -50px rgba(22,22,26,.4);
  transform: perspective(1400px) rotateY(-3.2deg) rotateX(1.4deg);
  transform-origin: 60% 50%;
  transition: transform .7s var(--ease);
}
.composer:hover { transform: perspective(1400px) rotateY(-1deg) rotateX(.4deg); }

.composer-input {
  display: flex;
  align-items: center;
  min-width: 0;
  min-height: 34px;
  font-family: var(--mono);
  font-size: 15px;
  color: var(--ink);
  padding: 0 2px 12px;
  border-bottom: 1px dashed var(--line);
  letter-spacing: .01em;
  overflow: hidden;
}
.composer-pinyin { white-space: nowrap; overflow: hidden; min-width: 0; }
.caret {
  display: inline-block;
  width: 1.5px;
  height: 17px;
  background: var(--brand);
  margin-left: 1px;
  animation: blink 1.1s steps(1) infinite;
}
@keyframes blink { 0%,49% { opacity: 1 } 50%,100% { opacity: 0 } }

/* —— 候选条（按真实 UI 比例复刻）—— */

.candbar {
  display: flex;
  align-items: stretch;
  gap: 2px;
  width: 100%;
  margin-top: 12px;
  padding: 5px 6px;
  background: rgba(24,24,26,.95);
  border-radius: 11px;
  box-shadow: 0 6px 18px -10px rgba(0,0,0,.5), inset 0 1px 0 rgba(255,255,255,.06);
  overflow: hidden;
}
.cand {
  display: flex;
  gap: 6px;
  padding: 5px 11px 6px;
  border-radius: 7px;
  min-width: 0;
  transition: background .22s var(--ease);
}
.cand .idx {
  font-family: var(--sans);
  font-size: 10px;
  color: rgba(255,255,255,.3);
  padding-top: 3px;
  line-height: 1;
}
.cand .txt { display: flex; flex-direction: column; gap: 1px; min-width: 0; }
.cand .zh {
  font-size: 16.5px;
  line-height: 1.15;
  color: #fff;
  font-weight: 500;
  letter-spacing: -.01em;
  white-space: nowrap;
}
.cand .en {
  font-size: 10.5px;
  line-height: 1.2;
  color: rgba(255,255,255,.46);
  white-space: nowrap;
}
.cand.is-active { background: var(--brand); }
.cand.is-active .zh { color: #fff; }
.cand.is-active .en { color: rgba(255,255,255,.82); }
.cand.is-active .idx { color: rgba(255,255,255,.6); }

.cand-arrows {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-left: auto;
  padding: 0 6px 0 10px;
  color: rgba(255,255,255,.38);
  font-size: 13px;
  font-family: var(--sans);
  flex-shrink: 0;
}
.cand-arrows .gear { font-size: 11px; opacity: .7; }

.composer-result {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
  padding: 10px 12px;
  background: var(--paper-2);
  border-radius: 10px;
  font-size: 13px;
  flex-wrap: wrap;
}
.cmd-hint { color: var(--ink-3); display: inline-flex; align-items: center; gap: 5px; white-space: nowrap; }
.arrow-sep { color: var(--ink-3); }
.result-en {
  font-family: var(--serif);
  font-size: 15px;
  color: var(--ink);
  letter-spacing: -.005em;
}

/* ─────────────── 三步 ─────────────── */

.how, .features, .download, .faq {
  padding: clamp(56px, 8vw, 104px) var(--pad);
  max-width: var(--max);
  margin: 0 auto;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(24px, 3vw, 40px);
}
.step { position: relative; }
.step-no {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-3);
  letter-spacing: .12em;
  display: block;
  margin-bottom: 14px;
}
.step-demo {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
  min-height: 104px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 10px;
  margin-bottom: 22px;
  position: relative;
  overflow: hidden;
}
.step h3 {
  font-size: clamp(19px, 2vw, 23px);
  margin: 0 0 10px;
  line-height: 1.3;
}
.step p { margin: 0; font-size: 14.5px; color: var(--ink-2); line-height: 1.7; }
.step p strong { color: var(--ink); font-weight: 600; }

/* 步骤里的小候选条 */
.mini-bar {
  display: flex;
  gap: 2px;
  padding: 4px;
  background: rgba(24,24,26,.95);
  border-radius: 8px;
  width: fit-content;
  max-width: 100%;
}
.mini-cand { display: flex; gap: 5px; padding: 4px 8px; border-radius: 5px; }
.mini-cand .idx { font-size: 8.5px; color: rgba(255,255,255,.3); padding-top: 2px; }
.mini-cand .txt { display: flex; flex-direction: column; }
.mini-cand .zh { font-size: 13px; color: #fff; line-height: 1.2; }
.mini-cand .en { font-size: 8.5px; color: rgba(255,255,255,.45); line-height: 1.25; }
.mini-cand.is-active { background: var(--brand); }
.mini-cand.is-active .en { color: rgba(255,255,255,.8); }

.mini-bar--hold { width: 100%; }
.mini-cand.is-hold {
  background: var(--brand);
  width: 100%;
  flex-direction: column;
  padding-right: 44px;
}
.hold-key {
  position: absolute;
  right: 14px;
  bottom: 14px;
}
.hold-key kbd { background: #fff; font-size: 15px; padding: 3px 8px; }

/* ─────────────── 功能 ─────────────── */

.features { border-top: 1px solid var(--line); }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
}
.feature {
  background: var(--paper);
  padding: clamp(22px, 2.6vw, 34px);
  transition: background .3s var(--ease);
}
.feature:hover { background: #fff; }
.feature h3 {
  font-size: 18.5px;
  margin: 0 0 10px;
  line-height: 1.35;
}
.feature p { margin: 0; font-size: 14px; color: var(--ink-2); line-height: 1.72; }

/* ─────────────── 实拍 ─────────────── */

.proof {
  padding: clamp(56px, 8vw, 104px) var(--pad);
  background: var(--night);
  color: #F2F0EC;
}
.proof-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
}
.proof .eyebrow { color: rgba(255,255,255,.4); }
.proof h2 {
  font-size: clamp(28px, 3.8vw, 46px);
  line-height: 1.2;
  margin: 0 0 20px;
  color: #fff;
}
.proof-copy > p {
  font-size: 15.5px;
  color: rgba(255,255,255,.62);
  margin: 0 0 30px;
  max-width: min(44ch, 100%);
}
.proof-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid rgba(255,255,255,.12); }
.proof-list li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid rgba(255,255,255,.09);
  font-size: 13.5px;
}
.proof-list span { color: rgba(255,255,255,.42); }
.proof-list b { font-weight: 500; color: rgba(255,255,255,.9); text-align: right; }

/* —— 语义解剖 —— */

.anatomy { display: flex; flex-direction: column; gap: 30px; }
.an-tag {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: rgba(255,255,255,.45);
  margin-bottom: 10px;
}
.an-tag em { font-style: normal; color: #6BA6FF; font-size: 13px; }
.an-desc {
  margin: 10px 0 0;
  font-size: 12.5px;
  line-height: 1.72;
  color: rgba(255,255,255,.45);
  max-width: min(48ch, 100%);
}
.an-desc strong { color: rgba(255,255,255,.88); font-weight: 500; }

.candbar--sm { padding: 4px 5px; border-radius: 9px; width: fit-content; }
.candbar--sm .cand { padding: 4px 9px 5px; }
.candbar--sm .zh { font-size: 14px; }
.candbar--sm .en { font-size: 9.5px; }

.sentence-row {
  display: flex;
  align-items: center;
  gap: 14px;
  background: rgba(24,24,26,.95);
  border-radius: 9px;
  padding: 10px 13px;
  box-shadow: 0 6px 18px -12px rgba(0,0,0,.6), inset 0 1px 0 rgba(255,255,255,.06);
}
.sr-left { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.sr-zh { font-size: 13px; line-height: 1.3; color: #fff; }
.sr-en { font-size: 11px; line-height: 1.35; color: rgba(255,255,255,.52); }
.sr-speaker { width: 15px; height: 15px; flex-shrink: 0; margin-left: auto; color: rgba(255,255,255,.4); }

/* ─────────────── 下载 ─────────────── */

.plat-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}
.plat {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: clamp(20px, 2.2vw, 28px);
  display: flex;
  flex-direction: column;
  transition: transform .26s var(--ease), box-shadow .3s var(--ease), border-color .26s var(--ease);
}
.plat:hover {
  transform: translateY(-3px);
  border-color: #D8D4CC;
  box-shadow: 0 14px 34px -22px rgba(22,22,26,.4);
}
.plat-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 12px;
}
.plat-no { font-family: var(--mono); font-size: 10.5px; color: var(--ink-3); letter-spacing: .1em; }
.plat-name { font-family: var(--serif); font-size: 22px; letter-spacing: -.01em; }
.plat-req { font-size: 12.5px; color: var(--ink-3); margin: 0 0 22px; line-height: 1.55; flex: 1; }
.plat-btn {
  display: block;
  text-align: center;
  font-size: 13.5px;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: var(--ink);
  color: var(--paper);
  transition: background .2s var(--ease), transform .18s var(--ease), border-color .2s var(--ease), color .2s var(--ease);
}
.plat-btn:hover { background: #000; transform: translateY(-1px); }
.plat-btn.is-pending,
.plat-btn.is-pending:hover {
  background: #fff;
  color: var(--ink-3);
  border-color: #D5D0C7;
  border-style: dashed;
  cursor: default;
  pointer-events: none;
  transform: none;
}
.plat-note {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--ink-3);
  margin: 10px 0 0;
  letter-spacing: .02em;
  line-height: 1.5;
}
.download-hint {
  margin: 26px 0 0;
  font-size: 12.5px;
  color: var(--ink-3);
  max-width: min(62ch, 100%);
}

/* ─────────────── 定价 ─────────────── */

.price { padding: 0 var(--pad) clamp(56px, 8vw, 96px); }
.price-card {
  max-width: var(--max);
  margin: 0 auto;
  background: var(--night);
  color: #F2F0EC;
  border-radius: 22px;
  padding: clamp(30px, 4vw, 56px);
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: center;
}
.price-left h2 {
  font-size: clamp(28px, 3.6vw, 42px);
  margin: 0 0 16px;
  color: #fff;
}
.price-left p { margin: 0; color: rgba(255,255,255,.58); font-size: 15px; max-width: min(46ch, 100%); }
.price .eyebrow { color: rgba(255,255,255,.4); }
.price-right { text-align: center; }
.price-num {
  font-family: var(--serif);
  font-size: clamp(46px, 5.4vw, 64px);
  line-height: 1;
  color: #fff;
  margin-bottom: 10px;
  letter-spacing: -.02em;
}
.price-num .cur { font-size: .44em; vertical-align: baseline; margin-right: 3px; opacity: .75; }
.price-num .per { font-family: var(--sans); font-size: .22em; color: rgba(255,255,255,.42); margin-left: 8px; vertical-align: baseline; }
.price-note { font-size: 12px; color: rgba(255,255,255,.42); margin: 0 0 20px; }
.price .btn-primary { background: #fff; color: var(--ink); }
.price .btn-primary:hover { background: #F2F0EC; }

/* ─────────────── FAQ ─────────────── */

.faq { border-top: 1px solid var(--line); }
.faq-list { max-width: 900px; border-top: 1px solid var(--line); }
details { border-bottom: 1px solid var(--line); }
summary {
  cursor: pointer;
  padding: 21px 34px 21px 0;
  font-size: 17px;
  font-family: var(--serif);
  list-style: none;
  position: relative;
  transition: color .2s var(--ease);
}
summary::-webkit-details-marker { display: none; }
summary::after {
  content: "";
  position: absolute;
  right: 6px;
  top: 28px;
  width: 9px; height: 9px;
  border-right: 1.4px solid var(--ink-3);
  border-bottom: 1.4px solid var(--ink-3);
  transform: rotate(45deg);
  transition: transform .28s var(--ease);
}
details[open] summary::after { transform: rotate(-135deg); top: 32px; }
summary:hover { color: var(--brand); }
details p {
  margin: 0;
  padding: 0 40px 24px 0;
  font-size: 14.5px;
  color: var(--ink-2);
  line-height: 1.78;
  animation: fadeIn .3s var(--ease);
}
@keyframes fadeIn { from { opacity: 0; transform: translateY(-4px) } to { opacity: 1; transform: none } }

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

.foot {
  border-top: 1px solid var(--line);
  padding: 40px var(--pad) 44px;
  background: var(--paper-2);
}
.foot-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.foot-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--serif);
  font-size: 14px;
  margin-right: auto;
}
.foot-brand img { border-radius: 5px; }
.foot-links { display: flex; gap: 20px; font-size: 13px; color: var(--ink-2); }
.foot-links a:hover { color: var(--ink); }
.foot-legal {
  display: flex;
  gap: 18px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: .03em;
}
.foot-legal a { color: inherit; }
.foot-legal a:hover { color: var(--ink-2); }
.foot-tech {
  max-width: var(--max);
  margin: 22px auto 0;
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--ink-3);
  letter-spacing: .03em;
}

/* ─────────────── 滚动淡入 ─────────────── */

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal.in { opacity: 1; transform: none; }

/* ─────────────── 响应式 ─────────────── */

@media (max-width: 1020px) {
  .hero-inner { grid-template-columns: minmax(0, 1fr); gap: 48px; }
  .hero-copy h1 { font-size: clamp(44px, 9vw, 76px); }
  .composer { transform: none; }
  .lede { max-width: min(46ch, 100%); }
  .steps { grid-template-columns: minmax(0, 1fr); gap: 36px; }
  .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .proof-inner { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .plat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .price-card { grid-template-columns: minmax(0, 1fr); }
  .price-right { text-align: left; }
  .price-note { margin-bottom: 16px; }
}

@media (max-width: 680px) {
  .nav-links { display: none; }
  .brand-en { display: none; }
  .cand:nth-child(n+4) { display: none; }
  .cand .zh { font-size: 15px; }
  .cand .en { font-size: 9.5px; }
  .composer { padding: 16px 14px 14px; border-radius: 16px; }
  .composer-input { font-size: 13px; }
  .feature-grid { grid-template-columns: minmax(0, 1fr); }
  .plat-grid { grid-template-columns: minmax(0, 1fr); }
  .proof-list li { font-size: 12.5px; }
  .foot-inner { gap: 14px; }
  .foot-legal { width: 100%; }
}