/* ============ Termii 官网 — 设计 token（与 src/styles/global.css 同源） ============ */
:root {
  --radius: 10px;
  --radius-sm: 7px;
  --font-ui: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Helvetica Neue", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, "Courier New", monospace;
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-emphasized: cubic-bezier(0.2, 0, 0, 1);
  --nav-h: 56px;
  --max-w: 1120px;
}

:root[data-theme="dark"] {
  --bg: #131416;
  --bg-elev: #1a1c1f;
  --bg-sunken: #0e0f11;
  --bg-hover: rgba(255, 255, 255, 0.045);
  --bg-active: rgba(255, 255, 255, 0.08);
  --fg: #e4e5e8;
  --fg-dim: #9a9da6;
  --fg-faint: #6b6e77;
  --hairline: rgba(255, 255, 255, 0.08);
  --hairline-strong: rgba(255, 255, 255, 0.14);
  --accent: #4c8dff;
  --accent-deep: #3568c4;
  --accent-soft: rgba(76, 141, 255, 0.14);
  --green: #3fb27f;
  --green-deep: #2c8a62;
  --green-soft: rgba(63, 178, 127, 0.14);
  --amber: #d9a13b;
  --amber-soft: rgba(217, 161, 59, 0.16);
  --red: #e5534b;
  --red-soft: rgba(229, 83, 75, 0.14);
  --gray-status: #7a7d86;
  --selection: rgba(76, 141, 255, 0.28);
  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: #f7f7f8;
  --bg-elev: #ffffff;
  --bg-sunken: #efeff1;
  --bg-hover: rgba(0, 0, 0, 0.04);
  --bg-active: rgba(0, 0, 0, 0.07);
  --fg: #24262b;
  --fg-dim: #62656e;
  --fg-faint: #9a9da6;
  --hairline: rgba(0, 0, 0, 0.09);
  --hairline-strong: rgba(0, 0, 0, 0.16);
  --accent: #2f6fe0;
  --accent-deep: #2558b8;
  --accent-soft: rgba(47, 111, 224, 0.1);
  --green: #1f9d64;
  --green-deep: #177a4d;
  --green-soft: rgba(31, 157, 100, 0.12);
  --amber: #b07f1f;
  --amber-soft: rgba(176, 127, 31, 0.14);
  --red: #d43c34;
  --red-soft: rgba(212, 60, 52, 0.1);
  --gray-status: #8b8e97;
  --selection: rgba(47, 111, 224, 0.22);
  color-scheme: light;
}

/* ============ 基础 ============ */
* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-ui);
  font-size: 15px;
  line-height: 1.65;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background 240ms var(--ease-out), color 240ms var(--ease-out);
}

::selection { background: var(--selection); }

.mono { font-family: var(--font-mono); }
.accent { color: var(--accent); }

code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  padding: 1px 6px;
  border-radius: 5px;
  background: var(--bg-hover);
  border: 1px solid var(--hairline);
}

h1, h2, h3, h4 { line-height: 1.25; letter-spacing: -0.01em; }

/* ============ 氛围层 ============ */
#glyph-field {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

main, .nav, .footer { position: relative; z-index: 2; }

/* 块状终端光标（difference 混合，反色覆盖） */
#block-cursor {
  position: fixed;
  top: 0; left: 0;
  width: 13px; height: 19px;
  border-radius: 3px;
  background: #fff;
  mix-blend-mode: difference;
  z-index: 999;
  pointer-events: none;
  opacity: 0;
  will-change: transform;
}
#block-cursor.live { opacity: 0.9; }
#block-cursor.hot { border-radius: 5px; }
@media (pointer: coarse) { #block-cursor { display: none; } }

/* 滚动进度 */
.scroll-progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 2px;
  z-index: 300;
  background: transparent;
}
#scroll-progress-fill {
  height: 100%;
  width: 0;
  background: var(--accent);
  transition: width 80ms linear;
}

/* ============ 状态灯 ============ */
.status-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  display: inline-block;
}
.status-dot.online { background: var(--green); }
.status-dot.offline { background: var(--gray-status); }
.status-dot.local { background: var(--accent); }
.status-dot.connecting {
  background: var(--amber);
  animation: breathe 1400ms ease-in-out infinite;
}
@keyframes breathe {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 var(--amber-soft); }
  50% { opacity: 0.35; box-shadow: 0 0 0 5px var(--amber-soft); }
}

/* ============ 状态驱动进场：connecting → online ============ */
[data-power] {
  opacity: 0.4;
  filter: saturate(0.4) brightness(0.92);
  transform: translateY(8px);
  transition:
    opacity 640ms var(--ease-emphasized) var(--d, 0s),
    filter 640ms var(--ease-emphasized) var(--d, 0s),
    transform 640ms var(--ease-emphasized) var(--d, 0s);
}
[data-power].online {
  opacity: 1;
  filter: none;
  transform: translateY(0);
}

[data-fade] {
  opacity: 0;
  transform: translateY(10px);
  transition:
    opacity 560ms var(--ease-emphasized) var(--d, 0s),
    transform 560ms var(--ease-emphasized) var(--d, 0s);
}
[data-fade].online { opacity: 1; transform: translateY(0); }

/* ============ 按键式按钮：物理键程 ============ */
.btn-key {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--hairline-strong);
  background: var(--bg-elev);
  color: var(--fg);
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  box-shadow: 0 3px 0 var(--hairline-strong);
  transform: translateY(0);
  transition: transform 70ms var(--ease-out), box-shadow 70ms var(--ease-out),
    background 140ms ease-in-out, border-color 140ms ease-in-out;
}
.btn-key:hover { background: var(--bg-hover); border-color: var(--fg-faint); }
.btn-key:active {
  transform: translateY(3px);
  box-shadow: 0 0 0 var(--hairline-strong);
}
.btn-key-primary {
  background: var(--accent);
  border-color: var(--accent-deep);
  color: #fff;
  box-shadow: 0 3px 0 var(--accent-deep);
}
.btn-key-primary:hover { background: var(--accent); filter: brightness(1.07); }
.btn-key-primary:active { box-shadow: 0 0 0 var(--accent-deep); }
.btn-key-lg { padding: 12px 22px; font-size: 14px; border-radius: var(--radius); }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px; height: 32px;
  border-radius: 7px;
  border: none;
  background: transparent;
  color: var(--fg-dim);
  cursor: pointer;
  transition: background 120ms ease-in-out, color 120ms ease-in-out;
}
.icon-btn:hover { background: var(--bg-hover); color: var(--fg); }

/* ============ 导航 ============ */
.nav {
  position: sticky;
  top: 0;
  z-index: 200;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 200ms ease-in-out;
}
.nav.scrolled { border-bottom-color: var(--hairline); }
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  height: var(--nav-h);
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 20px;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 600;
  font-size: 15px;
  color: var(--fg);
  text-decoration: none;
}
.nav-brand img { border-radius: 6px; }
.nav-version {
  font-size: 11px;
  color: var(--fg-faint);
  padding: 1px 7px;
  border: 1px solid var(--hairline);
  border-radius: 99px;
}
.nav-links { display: flex; gap: 4px; margin-left: 12px; flex: 1; }
.nav-links a {
  color: var(--fg-dim);
  text-decoration: none;
  font-size: 13px;
  padding: 5px 11px;
  border-radius: 7px;
  transition: background 120ms ease-in-out, color 120ms ease-in-out;
}
.nav-links a:hover { background: var(--bg-hover); color: var(--fg); }
.nav-actions { display: flex; align-items: center; gap: 10px; }

:root[data-theme="dark"] .icon-sun { display: block; }
:root[data-theme="dark"] .icon-moon { display: none; }
:root[data-theme="light"] .icon-sun { display: none; }
:root[data-theme="light"] .icon-moon { display: block; }

/* ============ 日志行 section 眉 ============ */
.log-line {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--fg-faint);
  margin-bottom: 18px;
}
.log-line .status-dot { transition: background 300ms ease-in-out; }
.center-line { justify-content: center; }

/* ============ Hero ============ */
.hero {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 88px 24px 96px;
}
.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: 56px;
  align-items: center;
}
.hero-title {
  font-size: clamp(38px, 5.2vw, 60px);
  font-weight: 700;
  letter-spacing: -0.025em;
  margin: 6px 0 22px;
}
.hero-title .line { display: block; overflow: hidden; }
.hero-title .line-inner { display: inline-block; will-change: transform; }
.grad {
  background: linear-gradient(100deg, var(--accent) 10%, var(--green) 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lede {
  font-size: 16px;
  color: var(--fg-dim);
  max-width: 44ch;
  margin-bottom: 30px;
}
.hero-cta { display: flex; gap: 14px; margin-bottom: 16px; flex-wrap: wrap; }
.hero-hints { font-size: 12px; color: var(--fg-faint); }

/* ---- 可交互分屏演示 ---- */
.hero-stage { min-width: 0; }
.split-window {
  --split: 50%;
  background: var(--bg-sunken);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius);
  overflow: hidden;
}
.split-titlebar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--hairline);
  background: var(--bg-elev);
}
.term-dot { width: 11px; height: 11px; border-radius: 50%; background: var(--bg-active); }
.term-dot.red { background: var(--red); opacity: 0.85; }
.term-dot.amber { background: var(--amber); opacity: 0.85; }
.term-dot.green { background: var(--green); }
.term-title { margin-left: 8px; font-size: 11.5px; color: var(--fg-faint); }
.term-rec {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--red);
}
.rec-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--red);
  animation: rec-blink 1.4s ease-in-out infinite;
}
@keyframes rec-blink { 0%, 100% { opacity: 1; } 50% { opacity: 0.25; } }

.split-body {
  display: flex;
  height: 290px;
}
.pane {
  min-width: 0;
  display: flex;
  flex-direction: column;
  padding: 12px 14px;
}
.pane-local { flex: 0 0 var(--split); }
.pane-remote { flex: 1 1 auto; border-left: none; }
.pane-head {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 10.5px;
  color: var(--fg-faint);
  padding-bottom: 9px;
  margin-bottom: 9px;
  border-bottom: 1px solid var(--hairline);
  letter-spacing: 0.04em;
}
.pane-stream {
  flex: 1;
  min-height: 0;
  overflow: hidden;
  font-size: 11px;
  line-height: 1.75;
  color: var(--fg-dim);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}
.pane-stream .stream-line {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  opacity: 0;
  transform: translateY(4px);
  animation: stream-in 320ms var(--ease-emphasized) forwards;
}
@keyframes stream-in { to { opacity: 1; transform: translateY(0); } }
.pane-stream .t-dim { color: var(--fg-faint); }
.pane-stream .t-green { color: var(--green); }
.pane-prompt {
  font-size: 11.5px;
  padding-top: 8px;
  border-top: 1px solid var(--hairline);
  display: flex;
  align-items: center;
}
.t-green { color: var(--green); }
.t-accent { color: var(--accent); }
.t-dim { color: var(--fg-faint); }
.caret {
  display: inline-block;
  width: 7px; height: 13px;
  background: var(--fg-dim);
  animation: blink 1.05s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.split-divider {
  flex: 0 0 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: col-resize;
  background: transparent;
  position: relative;
  touch-action: none;
}
.split-divider::before {
  content: "";
  position: absolute;
  top: 0; bottom: 0;
  left: 50%;
  width: 1px;
  background: var(--hairline);
  transition: background 140ms ease-in-out, width 140ms ease-in-out;
}
.split-divider:hover::before,
.split-divider.dragging::before,
.split-divider:focus-visible::before {
  background: var(--accent);
  width: 2px;
}
.divider-grip {
  position: relative;
  z-index: 1;
  width: 4px; height: 26px;
  border-radius: 2px;
  background: var(--hairline-strong);
  transition: background 140ms ease-in-out;
}
.split-divider:hover .divider-grip,
.split-divider.dragging .divider-grip { background: var(--accent); }
.split-divider:focus-visible { outline: none; }

.split-body.dragging { cursor: col-resize; user-select: none; }

.pane-metrics { display: flex; flex-direction: column; gap: 10px; flex: 1; justify-content: center; }
.pm-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
}
.pm-label { width: 28px; color: var(--fg-faint); font-size: 10px; }
.pm-row b { width: 38px; text-align: right; font-weight: 500; font-size: 11px; }
.meter {
  flex: 1;
  height: 5px;
  border-radius: 3px;
  background: var(--bg-hover);
  overflow: hidden;
}
.meter > div {
  height: 100%;
  border-radius: 3px;
  background: var(--accent);
  transition: width 700ms var(--ease-emphasized);
}
.meter.green > div { background: var(--green); }
.sparkline { width: 100%; height: 36px; color: var(--accent); }
.sparkline polyline { stroke: var(--accent); opacity: 0.85; }
.pm-net { font-size: 10.5px; color: var(--fg-faint); }

.split-statusbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border-top: 1px solid var(--hairline);
  background: var(--bg-elev);
  font-size: 11px;
  color: var(--fg-dim);
}
.split-statusbar .sep { color: var(--fg-faint); }
.split-statusbar .status-right { margin-left: auto; color: var(--fg-faint); }

.stage-hint {
  margin-top: 14px;
  text-align: center;
  font-size: 11.5px;
  color: var(--fg-faint);
}
.hint-arrow { color: var(--accent); }

/* ============ 数据条 ============ */
.stats-strip {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.stat {
  padding: 30px 20px 34px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-top: 1px solid var(--hairline);
}
.stat-num { font-size: 30px; font-weight: 600; color: var(--fg); }
.stat-num b { font-weight: 600; }
.stat-label { font-size: 12.5px; color: var(--fg-faint); }

/* ============ 区块通用 ============ */
.section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 96px 24px;
}
.section-alt {
  max-width: none;
  background: var(--bg-elev);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}
.section-alt > * { max-width: var(--max-w); margin-left: auto; margin-right: auto; }

.section-head { margin-bottom: 52px; max-width: 660px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head h2 { font-size: clamp(24px, 3vw, 34px); font-weight: 700; margin-bottom: 14px; min-height: 1.25em; }
.section-sub { color: var(--fg-dim); font-size: 15px; }

/* ============ Bento 卡片 ============ */
.bento {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.card {
  position: relative;
  background: var(--bg-elev);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 24px 24px 22px;
  overflow: hidden;
  transition: border-color 200ms ease-in-out;
}
.card::before {
  /* 顶部 hairline 描边生长 */
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 480ms var(--ease-emphasized);
}
.card.online::before { transform: scaleX(1); }
.card:hover { border-color: var(--hairline-strong); }
.card.span-2 { grid-column: span 2; }
.power-dot {
  position: absolute;
  top: 18px; right: 18px;
}
.card-icon {
  width: 38px; height: 38px;
  border-radius: 9px;
  background: var(--accent-soft);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.card h3 { font-size: 15.5px; font-weight: 600; margin-bottom: 8px; }
.card p { font-size: 13px; color: var(--fg-dim); line-height: 1.65; }

/* ============ 深度亮点 ============ */
.hl-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  gap: 56px;
  align-items: center;
  padding: 48px 0;
  border-top: 1px solid var(--hairline);
}
.hl-row:first-of-type { border-top: none; }
.hl-row.flip .hl-copy { order: 2; }
.hl-row.flip .hl-mock { order: 1; }
.hl-tag {
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-bottom: 10px;
}
.hl-copy h3 { font-size: 24px; font-weight: 650; margin-bottom: 12px; }
.hl-copy > p { color: var(--fg-dim); font-size: 14.5px; margin-bottom: 18px; }
.hl-list { list-style: none; }
.hl-list li {
  position: relative;
  padding-left: 18px;
  font-size: 13.5px;
  color: var(--fg-dim);
  margin-bottom: 8px;
}
.hl-list li::before {
  content: "";
  position: absolute;
  left: 0; top: 8px;
  width: 7px; height: 7px;
  border-radius: 2px;
  background: var(--accent-soft);
  border: 1px solid var(--accent);
}

.mock-window {
  background: var(--bg-sunken);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius);
  padding: 18px;
}
.mock-titlebar {
  font-size: 12px;
  color: var(--fg-dim);
  padding-bottom: 14px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--hairline);
}
.mock-footnote { margin-top: 16px; font-size: 11.5px; color: var(--fg-faint); }

/* 跳板链路：数据包沿轨道脉冲 */
.jump-chain {
  position: relative;
  display: flex;
  align-items: stretch;
  gap: 8px;
  padding-top: 14px;
}
.jump-track {
  position: absolute;
  top: 0; left: 4%; right: 4%;
  height: 1px;
  background: var(--hairline-strong);
}
.jump-packet {
  position: absolute;
  top: -3px;
  left: 0;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  animation: packet-travel 3.2s var(--ease-emphasized) infinite;
}
@keyframes packet-travel {
  0% { left: 0; opacity: 0; }
  8% { opacity: 1; }
  88% { opacity: 1; }
  100% { left: calc(100% - 7px); opacity: 0; }
}
.jump-hop {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-align: center;
  padding: 12px 8px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  background: var(--bg-elev);
}
.jump-hop > div { min-width: 0; }
.jump-hop b { display: block; font-size: 12px; font-weight: 600; }
.jump-hop .mono { display: block; font-size: 10px; color: var(--fg-faint); }
.jump-hop.done { border-color: color-mix(in srgb, var(--green) 40%, transparent); }
.jump-hop.active {
  border-color: color-mix(in srgb, var(--amber) 50%, transparent);
  background: var(--amber-soft);
}
.jump-hop.pending { opacity: 0.55; }

/* SFTP mock */
.sftp-panes { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.sftp-pane {
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  background: var(--bg-elev);
  padding: 10px 0 6px;
}
.sftp-path {
  font-size: 10.5px;
  color: var(--fg-faint);
  padding: 0 12px 8px;
  border-bottom: 1px solid var(--hairline);
  margin-bottom: 4px;
}
.sftp-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 5px 12px;
  font-size: 12px;
}
.sftp-row.active { background: var(--accent-soft); }
.sftp-meta { font-size: 10.5px; color: var(--fg-faint); }
.transfer-bar {
  margin-top: 14px;
  padding: 10px 12px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  background: var(--bg-elev);
  font-size: 11.5px;
  color: var(--fg-dim);
}
.progress {
  margin-top: 8px;
  height: 4px;
  border-radius: 2px;
  background: var(--bg-hover);
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  width: 68%;
  border-radius: 2px;
  background: var(--accent);
  transition: width 500ms var(--ease-emphasized);
}

/* 指标 mock */
.metrics-mock { display: flex; flex-direction: column; gap: 14px; }
.metric-head {
  display: flex;
  justify-content: space-between;
  font-size: 12.5px;
  color: var(--fg-dim);
  margin-bottom: 6px;
}
.metrics-mock .meter { flex: none; height: 5px; }

/* ============ 原则网格 ============ */
.principle-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border-top: 1px solid var(--hairline);
  border-left: 1px solid var(--hairline);
}
.principle {
  position: relative;
  padding: 30px 28px;
  border-right: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}
.principle-num {
  display: block;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 12px;
}
.principle h4 { font-size: 15.5px; font-weight: 600; margin-bottom: 8px; }
.principle p { font-size: 13.5px; color: var(--fg-dim); }

/* ============ 快捷键 ============ */
.kbd-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.kbd-row {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 18px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--bg-elev);
  font-size: 13px;
  color: var(--fg-dim);
  transition: border-color 160ms ease-in-out, transform 160ms var(--ease-out);
}
.kbd-row:hover { border-color: var(--hairline-strong); transform: translateY(-2px); }
kbd {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 3px 8px;
  border: 1px solid var(--hairline-strong);
  border-radius: 6px;
  background: var(--bg-sunken);
  color: var(--fg);
  margin-right: 4px;
  box-shadow: 0 2px 0 var(--hairline-strong);
  display: inline-block;
  transition: transform 70ms var(--ease-out), box-shadow 70ms var(--ease-out);
}
.kbd-row:hover kbd { transform: translateY(1px); box-shadow: 0 1px 0 var(--hairline-strong); }

/* ============ 下载 ============ */
.cta-section { padding-bottom: 112px; }
.dl-card {
  position: relative;
  max-width: 680px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 22px;
  padding: 26px 28px;
  border: 1px solid var(--hairline-strong);
  border-radius: calc(var(--radius) + 2px);
  background: var(--bg-elev);
}
.dl-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 480ms var(--ease-emphasized);
}
.dl-card.online::before { transform: scaleX(1); }
.dl-icon { border-radius: 16px; flex-shrink: 0; }
.dl-info { flex: 1; min-width: 0; }
.dl-name { font-size: 16.5px; font-weight: 650; margin-bottom: 3px; }
.dl-meta { font-size: 11.5px; color: var(--fg-dim); margin-bottom: 2px; }
.dl-sha { font-size: 10.5px; color: var(--fg-faint); }
.cta-note {
  margin-top: 22px;
  text-align: center;
  font-size: 13px;
  color: var(--fg-dim);
}

/* ============ 页脚 ============ */
.footer {
  border-top: 1px solid var(--hairline);
  background: var(--bg-elev);
  overflow: hidden;
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 24px 24px 36px;
}
.footer-wordmark {
  font-size: clamp(72px, 14vw, 168px);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1;
  text-align: center;
  color: transparent;
  -webkit-text-stroke: 1px var(--hairline-strong);
  user-select: none;
  margin-bottom: 20px;
  transition: color 600ms var(--ease-emphasized);
}
.footer-wordmark:hover { color: var(--accent-soft); }
.footer-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
  text-align: center;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 14px;
}
.footer-brand img { border-radius: 5px; }
.footer-line { font-size: 13px; color: var(--fg-dim); }
.footer-meta { font-size: 11.5px; color: var(--fg-faint); }

/* ============ 响应式 ============ */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; gap: 44px; }
  .bento { grid-template-columns: repeat(2, 1fr); }
  .card.span-2 { grid-column: span 2; }
  .hl-row { grid-template-columns: 1fr; gap: 28px; }
  .hl-row.flip .hl-copy { order: 1; }
  .hl-row.flip .hl-mock { order: 2; }
  .kbd-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-links { display: none; }
}
@media (max-width: 620px) {
  .bento { grid-template-columns: 1fr; }
  .card.span-2 { grid-column: span 1; }
  .principle-grid { grid-template-columns: 1fr; }
  .stats-strip { grid-template-columns: repeat(2, 1fr); }
  .dl-card { flex-direction: column; text-align: center; }
  .section { padding: 64px 20px; }
  .hero { padding: 56px 20px 64px; }
  .split-body { height: 250px; }
}

/* ============ prefers-reduced-motion ============ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  [data-power], [data-fade] { opacity: 1; filter: none; transform: none; }
  #glyph-field, #block-cursor { display: none; }
}