/* ===================================================================
   元数点AI工作台 · 官方站 (Light Cool · Bento Grid)
   -------------------------------------------------------------------
   气质: 简洁 · 大气 · 优雅 · 大厂风 · 编辑式
   配色: 白 #FFFFFF + 浅灰 #F6F8FB + 品牌青 #1FB8C9 + 极光紫 #7E4FD0 + 中蓝 #4D6BB7
   字体: Inter (sans) · Noto Serif SC (display) · JetBrains Mono (点缀)
   =================================================================== */

:root {
  /* ---- 色板 ---- */
  --c-paper:      #FFFFFF;
  --c-paper-2:    #F6F8FB;
  --c-paper-3:    #EEF1F6;
  --c-paper-warm: #FAFBFD;

  --c-ink:        #0F1729;
  --c-ink-2:      #475569;
  --c-ink-3:      #94A3B8;
  --c-ink-4:      #CBD5E1;

  --c-line:       rgba(15, 23, 41, 0.08);
  --c-line-soft:  rgba(15, 23, 41, 0.04);
  --c-line-strong:rgba(15, 23, 41, 0.14);

  /* 强调色三件套（与 logo 渐变一致）*/
  --c-blue:       #1FB8C9;    /* 青 */
  --c-blue-600:   #189BA9;
  --c-blue-50:    #EAF7FA;

  --c-violet:     #7E4FD0;    /* 紫 */
  --c-violet-600: #6B3FB8;
  --c-violet-50:  #F2EAFA;

  --c-indigo:     #4D6BB7;    /* 中间蓝 */
  --c-indigo-600: #3F5BA0;
  --c-indigo-50:  #EBF0F9;

  /* 品牌渐变（与 logo 一致：青→蓝→紫）*/
  --grad:         linear-gradient(135deg, #1FB8C9 0%, #4D6BB7 50%, #7E4FD0 100%);
  --grad-soft:    linear-gradient(135deg, rgba(31,184,201,0.08) 0%, rgba(126,79,208,0.08) 100%);

  /* 状态色 */
  --c-ok:    #10B981;
  --c-warn:  #F59E0B;
  --c-err:   #EF4444;

  /* ---- 字体 ---- */
  --f-sans:    "Inter", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --f-display: "Noto Serif SC", Georgia, "Songti SC", serif;
  --f-mono:    "JetBrains Mono", ui-monospace, "Cascadia Code", "SF Mono", Consolas, monospace;

  /* ---- 圆角 ---- */
  --r-1: 12px;
  --r-2: 20px;
  --r-3: 28px;
  --r-pill: 999px;

  /* ---- 阴影 ---- */
  --sh-1: 0 1px 2px rgba(15,23,41,.04);
  --sh-2: 0 4px 16px rgba(15,23,41,.06);
  --sh-3: 0 12px 32px rgba(15,23,41,.08);
  --sh-4: 0 32px 64px rgba(15,23,41,.10);

  /* ---- 节奏 ---- */
  --container: 1240px;
  --gutter: 24px;
  --section-y: 120px;
  --nav-h: 64px;

  /* ---- 动画 ---- */
  --ease:     cubic-bezier(0.2, 0.7, 0.2, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

@media (max-width: 768px) {
  :root {
    --gutter: 16px;
    --section-y: 72px;
    --nav-h: 60px;
  }
}

/* ===================================================================
   RESET
   =================================================================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--f-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--c-ink);
  background: var(--c-paper);
  font-feature-settings: "ss01", "cv11";
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
button { font: inherit; cursor: pointer; background: none; border: 0; }

::selection { background: var(--c-blue); color: #fff; }

em.mono, .mono { font-family: var(--f-mono); font-style: normal; font-size: 0.92em; }

/* ===================================================================
   REVEAL · 滚动入场（极简，无视差/磁吸）
   =================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.reveal.in { opacity: 1; transform: none; }

/* 兜底：3 秒后无论 IO 怎样都强制显示 */
html.reveal-timeout .reveal:not(.in) { opacity: 1; transform: none; }

/* ===================================================================
   LAYOUT
   =================================================================== */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.container-narrow { max-width: 880px; }

.section {
  padding: var(--section-y) 0;
}
.section-alt {
  background: var(--c-paper-2);
}

.sec-head {
  margin-bottom: 56px;
  max-width: 880px;
}
.sec-label {
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--c-ink-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 18px;
}
.sec-label em { color: var(--c-blue); font-style: normal; }

.sec-title {
  font-family: var(--f-display);
  font-weight: 600;
  font-size: clamp(32px, 4.5vw, 56px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--c-ink);
  margin-bottom: 20px;
}
.sec-title em.grad {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.sec-lede {
  font-size: 17px;
  line-height: 1.7;
  color: var(--c-ink-2);
  max-width: 720px;
}

/* ===================================================================
   NAV
   =================================================================== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease);
}
.nav.scrolled {
  background: rgba(255, 255, 255, 0.92);
  border-bottom-color: var(--c-line);
}

.nav-in {
  max-width: var(--container);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  gap: 32px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.brand-mark {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: var(--c-paper-2);
  display: inline-flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.brand-mark img { width: 36px; height: 36px; }
.brand-text {
  font-family: var(--f-display);
  font-weight: 600;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--c-ink);
}
.brand-text em {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.brand-tag {
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--c-ink-3);
  padding: 3px 8px;
  border: 1px solid var(--c-line);
  border-radius: 6px;
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-left: auto;
  margin-right: 12px;
}
.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--c-ink-2);
  transition: color 0.2s var(--ease);
  position: relative;
}
.nav-links a:hover { color: var(--c-ink); }

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  background: var(--c-ink);
  color: #fff;
  border-radius: var(--r-pill);
  font-size: 13.5px;
  font-weight: 500;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease);
}
.nav-cta:hover {
  background: var(--c-blue);
  transform: translateY(-1px);
}
.nav-cta-ver {
  font-family: var(--f-mono);
  font-size: 11px;
  opacity: 0.65;
  padding-left: 8px;
  border-left: 1px solid rgba(255,255,255,0.25);
}

@media (max-width: 900px) {
  .nav-links { display: none; }
  .brand-tag { display: none; }
}

/* ===================================================================
   HERO
   =================================================================== */
.hero {
  padding: calc(var(--nav-h) + 80px) 0 80px;
  background:
    radial-gradient(circle at 8% 14%, rgba(31,184,201,0.06) 0%, transparent 40%),
    radial-gradient(circle at 92% 88%, rgba(126,79,208,0.05) 0%, transparent 45%),
    var(--c-paper);
  position: relative;
  overflow: hidden;
}

.hero-in {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px 6px 12px;
  background: var(--c-paper-2);
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  font-size: 13px;
  font-weight: 500;
  color: var(--c-ink-2);
  margin-bottom: 28px;
}
.eyebrow-dot {
  width: 6px; height: 6px;
  background: var(--c-blue);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(31,184,201,0.18);
}
.eyebrow-sep { color: var(--c-ink-4); }
.eyebrow-mono {
  font-family: var(--f-mono);
  color: var(--c-ink-3);
}

.display {
  font-family: var(--f-display);
  font-weight: 600;
  font-size: clamp(38px, 5.2vw, 68px);
  line-height: 1.08;
  letter-spacing: -0.025em;
  color: var(--c-ink);
  margin-bottom: 24px;
}
.display em.grad {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}

.lede {
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-ink-2);
  max-width: 560px;
  margin-bottom: 36px;
}
.lede strong {
  color: var(--c-ink);
  font-weight: 600;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 48px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border-radius: var(--r-pill);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.25s var(--ease);
  white-space: nowrap;
}
.btn-label { display: inline-flex; align-items: center; gap: 6px; }
.btn-primary {
  background: var(--c-ink);
  color: #fff;
}
.btn-primary:hover {
  background: var(--c-blue);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(31,184,201,0.3);
}
.btn-primary .btn-icon {
  display: inline-flex;
}
.btn-ghost {
  background: var(--c-paper);
  color: var(--c-ink);
  border: 1px solid var(--c-line);
}
.btn-ghost:hover {
  background: var(--c-paper-2);
  border-color: var(--c-line-strong);
}
.btn-ghost .btn-arrow { font-size: 16px; transition: transform 0.2s var(--ease); }
.btn-ghost:hover .btn-arrow { transform: translateX(3px); }

.btn-lg { padding: 16px 28px; font-size: 15px; }
.btn-lg .btn-meta {
  font-family: var(--f-mono);
  font-size: 11.5px;
  opacity: 0.7;
  padding-left: 10px;
  border-left: 1px solid rgba(255,255,255,0.25);
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  max-width: 580px;
}
.hm-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-top: 14px;
  border-top: 1px solid var(--c-line);
}
.hm-item b {
  font-size: 13px;
  font-weight: 600;
  color: var(--c-ink);
  letter-spacing: -0.01em;
}
.hm-item span {
  font-size: 12px;
  color: var(--c-ink-3);
}

@media (max-width: 700px) {
  .hero-meta { grid-template-columns: repeat(2, 1fr); }
}

/* HERO 右侧视觉 */
.hero-visual {
  position: relative;
}
.hero-shot {
  position: relative;
  z-index: 2;
}
.shot-frame {
  border-radius: var(--r-2);
  overflow: hidden;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  box-shadow: var(--sh-3);
}
.shot-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 16px;
  background: var(--c-paper-2);
  border-bottom: 1px solid var(--c-line);
}
.shot-bar .d {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--c-ink-4);
}
.shot-bar .d1 { background: #FF5F57; }
.shot-bar .d2 { background: #FEBC2E; }
.shot-bar .d3 { background: #28C840; }
.shot-bar em {
  margin-left: 10px;
  font-family: var(--f-mono);
  font-size: 11.5px;
  color: var(--c-ink-3);
  font-style: normal;
}
.shot-frame img {
  width: 100%;
  height: auto;
  display: block;
}

.hero-chips {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 3;
}
.chip {
  position: absolute;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--r-1);
  padding: 10px 14px;
  box-shadow: var(--sh-2);
  display: flex;
  flex-direction: column;
  gap: 2px;
  animation: chip-float 5s ease-in-out infinite;
}
.chip-num {
  font-family: var(--f-display);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.02em;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
  line-height: 1;
}
.chip-label {
  font-size: 11px;
  color: var(--c-ink-3);
}
.chip-1 { top: -16px; right: -8px; animation-delay: 0s; }
.chip-2 { top: 36%; left: -28px; animation-delay: -1.6s; }
.chip-3 { bottom: -8px; right: 24px; animation-delay: -3.2s; }

@keyframes chip-float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-6px); }
}

@media (max-width: 980px) {
  .hero-in {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .chip-1, .chip-3 { right: 8px; }
  .chip-2 { left: 8px; }
}

/* ===================================================================
   BENTO GRID · 核心
   =================================================================== */
.bento {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--gutter);
}

.bento-cell {
  position: relative;
  border-radius: var(--r-2);
  padding: 36px;
  overflow: hidden;
  border: 1px solid var(--c-line);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
  display: flex;
  flex-direction: column;
}
.bento-cell:hover {
  transform: translateY(-4px);
  box-shadow: var(--sh-3);
}

/* 不同调色 */
.tone-blue  { background: linear-gradient(135deg, #EAF7FA 0%, #FFFFFF 70%); }
.tone-violet{ background: linear-gradient(135deg, #F2EAFA 0%, #FFFFFF 70%); }
.tone-indigo{ background: linear-gradient(135deg, #EBF0F9 0%, #FFFFFF 70%); }
.tone-warm  { background: linear-gradient(135deg, #FAFBFD 0%, #FFFFFF 70%); }

/* 列宽 */
.col-4  { grid-column: span 4; }
.col-5  { grid-column: span 5; }
.col-6  { grid-column: span 6; }
.col-7  { grid-column: span 7; }
.col-12 { grid-column: span 12; }

@media (max-width: 980px) {
  .col-4  { grid-column: span 6; }
  .col-5  { grid-column: span 12; }
  .col-7  { grid-column: span 12; }
}
@media (max-width: 700px) {
  .col-4  { grid-column: span 12; }
  .col-6  { grid-column: span 12; }
}

/* Bento 内容 */
.cell-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.cell-tag {
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--c-blue);
  background: rgba(31,184,201,0.10);
  padding: 4px 10px;
  border-radius: var(--r-pill);
  letter-spacing: 0.02em;
}
.cell-tag-mini {
  font-size: 12px;
  color: var(--c-ink-3);
}

.cell-title {
  font-family: var(--f-display);
  font-weight: 600;
  font-size: clamp(22px, 2.4vw, 30px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--c-ink);
  margin-bottom: 14px;
}

.cell-desc {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--c-ink-2);
  margin-bottom: 20px;
  max-width: 560px;
}

.feature-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 24px;
}
.feature-pill {
  display: inline-flex;
  align-items: center;
  padding: 5px 12px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  font-size: 12px;
  font-weight: 500;
  color: var(--c-ink-2);
}

.cell-shot {
  margin-top: auto;
  border-radius: var(--r-1);
  overflow: hidden;
  border: 1px solid var(--c-line);
  background: var(--c-paper);
  box-shadow: var(--sh-2);
}
.cell-shot img {
  width: 100%;
  height: auto;
  display: block;
}

/* 整行 Bento cell 的 meta 横排 */
.cell-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 14px;
}
.cell-meta-left {
  display: flex;
  align-items: center;
  gap: 12px;
}
.cell-meta-left .cell-title { margin-bottom: 0; }
.cell-meta-right {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.cell-shot-wide {
  margin-top: 12px;
}

@media (max-width: 700px) {
  .bento-cell { padding: 24px; }
  .cell-meta-row { flex-direction: column; align-items: flex-start; }
}

/* ===================================================================
   CAPABILITY GRID · 6 大能力
   =================================================================== */
.cap-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gutter);
}
@media (max-width: 980px) { .cap-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .cap-grid { grid-template-columns: 1fr; } }

.cap-card {
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--r-2);
  padding: 32px 28px;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
  position: relative;
  overflow: hidden;
}
.cap-card:hover {
  transform: translateY(-3px);
  border-color: var(--c-blue);
  box-shadow: var(--sh-2);
}
.cap-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--grad);
  opacity: 0;
  transition: opacity 0.3s var(--ease);
}
.cap-card:hover::before { opacity: 1; }

.cap-num {
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--c-blue);
  font-weight: 500;
  letter-spacing: 0.04em;
  margin-bottom: 16px;
  display: block;
}
.cap-title {
  font-family: var(--f-display);
  font-weight: 600;
  font-size: 22px;
  letter-spacing: -0.015em;
  color: var(--c-ink);
  margin-bottom: 10px;
}
.cap-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-ink-2);
}

/* ===================================================================
   COMPARE TABLE
   =================================================================== */
.cmp-table {
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--r-2);
  overflow: hidden;
}
.cmp-row {
  display: grid;
  grid-template-columns: 180px 1fr 1fr 1.4fr;
  gap: 0;
  align-items: center;
  border-top: 1px solid var(--c-line);
}
.cmp-row > div { padding: 18px 24px; font-size: 14px; line-height: 1.5; }
.cmp-row-head { background: var(--c-paper-2); border-top: 0; font-weight: 500; }
.cmp-row-head > div { font-size: 13px; color: var(--c-ink-2); }
.cmp-row-head .cmp-yes { color: var(--c-ink); font-family: var(--f-display); font-size: 16px; }
.cmp-row-head .cmp-yes strong { font-weight: 600; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.cmp-key {
  font-family: var(--f-mono);
  font-size: 12px !important;
  color: var(--c-ink-3) !important;
  background: var(--c-paper-2);
  font-weight: 500;
  letter-spacing: 0.02em;
}
.cmp-yes {
  background: linear-gradient(135deg, rgba(31,184,201,0.04) 0%, rgba(126,79,208,0.04) 100%);
  color: var(--c-ink);
  font-weight: 500;
}
.cmp-yes b {
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
  font-weight: 600;
}

@media (max-width: 800px) {
  .cmp-row { grid-template-columns: 100px 1fr; }
  .cmp-row > div:nth-child(3),
  .cmp-row > div:nth-child(4) { grid-column: 2; padding-top: 0; }
  .cmp-row > div:nth-child(2) { display: none; }
  .cmp-row-head > div:nth-child(2) { display: none; }
  .cmp-row-head > div:nth-child(3),
  .cmp-row-head > div:nth-child(4) { grid-column: auto; padding: 18px 24px; }
  .cmp-row-head { grid-template-columns: 100px 1fr 1fr; }
}

/* ===================================================================
   FAQ
   =================================================================== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--r-1);
  overflow: hidden;
  transition: border-color 0.2s var(--ease);
}
.faq-item[open] { border-color: var(--c-blue); }
.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 22px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--f-display);
  font-weight: 600;
  font-size: 16.5px;
  color: var(--c-ink);
  letter-spacing: -0.005em;
  user-select: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-q { flex: 1; }
.faq-ico {
  font-family: var(--f-mono);
  font-size: 18px;
  font-weight: 400;
  color: var(--c-ink-3);
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--c-paper-2);
  display: inline-flex; align-items: center; justify-content: center;
  transition: transform 0.3s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease);
  flex-shrink: 0;
}
.faq-item[open] .faq-ico {
  transform: rotate(45deg);
  background: var(--c-blue);
  color: #fff;
}
.faq-a {
  padding: 0 24px 22px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--c-ink-2);
}
.faq-a b {
  color: var(--c-ink);
  font-weight: 600;
}

/* ===================================================================
   DOWNLOAD
   =================================================================== */
.section-download { padding-bottom: var(--section-y); }
.dl-card {
  background:
    radial-gradient(circle at 10% 10%, rgba(31,184,201,0.08) 0%, transparent 50%),
    radial-gradient(circle at 90% 90%, rgba(126,79,208,0.08) 0%, transparent 50%),
    var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--r-3);
  padding: 56px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.dl-title {
  font-family: var(--f-display);
  font-weight: 600;
  font-size: clamp(32px, 4vw, 48px);
  letter-spacing: -0.02em;
  color: var(--c-ink);
  margin-bottom: 12px;
}
.dl-title em.grad {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.dl-lede {
  font-size: 15px;
  color: var(--c-ink-2);
  margin-bottom: 32px;
}

.dl-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-bottom: 32px;
}
.btn-os-icon {
  display: inline-flex;
  align-items: center;
}

.dl-info {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0;
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
  margin-bottom: 24px;
  padding: 18px 0;
}
.dl-info li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 0 24px;
  border-right: 1px solid var(--c-line);
  text-align: center;
}
.dl-info li:last-child { border-right: 0; }
.dl-info li span {
  font-size: 11px;
  color: var(--c-ink-3);
  font-family: var(--f-mono);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.dl-info li b {
  font-family: var(--f-mono);
  font-size: 13px;
  color: var(--c-ink);
  font-weight: 500;
}
.dl-sha {
  font-size: 11.5px !important;
  color: var(--c-ink-2) !important;
  white-space: nowrap;
}

.dl-foot {
  font-size: 12.5px;
  color: var(--c-ink-3);
  line-height: 1.7;
}
.dl-foot a {
  color: var(--c-blue);
  font-family: var(--f-mono);
  font-size: 12px;
  word-break: break-all;
}
.dl-foot a:hover { text-decoration: underline; }

@media (max-width: 600px) {
  .dl-card { padding: 40px 24px; }
  .dl-info { flex-direction: column; gap: 12px; }
  .dl-info li { border-right: 0; padding: 8px 0; border-bottom: 1px solid var(--c-line-soft); }
  .dl-info li:last-child { border-bottom: 0; }
}

/* ===================================================================
   FOOTER
   =================================================================== */
.footer {
  background: var(--c-paper-warm);
  border-top: 1px solid var(--c-line);
  padding-top: 56px;
}
.footer-in {
  display: grid;
  grid-template-columns: 1.4fr 3fr;
  gap: 64px;
  padding-bottom: 48px;
}
.footer-brand .brand { margin-bottom: 16px; }
.footer-line {
  font-family: var(--f-display);
  font-size: 15px;
  color: var(--c-ink-2);
  margin-bottom: 24px;
  max-width: 260px;
  line-height: 1.6;
}
.footer-qr-label {
  font-size: 11px;
  color: var(--c-ink-3);
  font-family: var(--f-mono);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}
.footer-qr {
  width: 120px; height: 120px;
  border-radius: var(--r-1);
  border: 1px solid var(--c-line);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}
.footer-col h4 {
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--c-ink-3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
}
.footer-col a {
  display: block;
  font-size: 13.5px;
  color: var(--c-ink-2);
  padding: 4px 0;
  transition: color 0.2s var(--ease);
}
.footer-col a:hover { color: var(--c-blue); }

@media (max-width: 800px) {
  .footer-in { grid-template-columns: 1fr; gap: 32px; }
  .footer-cols { grid-template-columns: repeat(2, 1fr); }
}

.footer-bottom {
  border-top: 1px solid var(--c-line);
  padding: 22px 0;
}
.footer-bottom-in {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12.5px;
  color: var(--c-ink-3);
}
.footer-meta a { color: var(--c-ink-2); }
.footer-meta a:hover { color: var(--c-blue); }
.footer-meta em { color: var(--c-ink); }

/* ===================================================================
   实用类
   =================================================================== */
.grain { display: none; }  /* 不沿用 zhiyan 的噪点背景 */
.cursor-glow { display: none; } /* 不沿用 zhiyan 的鼠标光斑 */

/* 移动端隐藏动画 chip 防溢出 */
@media (max-width: 600px) {
  .chip { transform: scale(0.85); transform-origin: top left; }
}