/* ============================================================
   Taskstick 日事贴 官网样式
   双主题：暗夜星图控制台（dark） / 白天工程图纸（light）
   ============================================================ */

/* 源泉圆体 GenSen Rounded 2 TW（SIL OFL 1.1）自托管子集，
   由 tools/subset-fonts.py 生成，仅含站点文案字符 */
@font-face {
  font-family: "GenSen Rounded";
  src: url("../fonts/GenSenRounded2TW-R.subset.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "GenSen Rounded";
  src: url("../fonts/GenSenRounded2TW-B.subset.woff2") format("woff2");
  font-weight: 500 700;
  font-style: normal;
  font-display: swap;
}

/* ---------- 主题变量 ---------- */
:root,
html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #070b09;
  --bg-elev: #0b120e;
  --ink: rgba(232, 245, 238, .94);
  --ink-dim: rgba(232, 245, 238, .60);
  --ink-faint: rgba(232, 245, 238, .38);
  --line: rgba(160, 220, 190, .14);
  --line-strong: rgba(160, 220, 190, .38);
  --accent: #3FCF8E;
  --accent-dim: #2f9e6e;
  --accent-deep: #14532d;
  --accent-ink: #04110a;
  --grid-line: rgba(255, 255, 255, .030);
  --grid-line-strong: rgba(255, 255, 255, .055);
  --glow: 0 0 14px rgba(63, 207, 142, .40);
  --vignette: radial-gradient(ellipse at 50% 42%, transparent 52%, rgba(0, 0, 0, .5) 100%);
  --fx-fallback: radial-gradient(ellipse at 50% 45%, rgba(63, 207, 142, .10), transparent 62%);
  --nav-bg: rgba(7, 11, 9, .72);
  --hero-fade: linear-gradient(to top, rgba(7, 11, 9, .88), rgba(7, 11, 9, 0) 55%);
  --detail-bg: rgba(4, 10, 7, .88);
}

html[data-theme="light"] {
  color-scheme: light;
  --bg: #f3f5f1;
  --bg-elev: #fbfcfa;
  --ink: #152019;
  --ink-dim: rgba(21, 32, 25, .66);
  --ink-faint: rgba(21, 32, 25, .42);
  --line: rgba(20, 70, 45, .16);
  --line-strong: rgba(20, 70, 45, .42);
  --accent: #2E9E62;
  --accent-dim: #267a4d;
  --accent-deep: #bfe3d0;
  --accent-ink: #ffffff;
  --grid-line: rgba(20, 70, 45, .045);
  --grid-line-strong: rgba(20, 70, 45, .085);
  --glow: 0 0 10px rgba(46, 158, 98, .22);
  --vignette: radial-gradient(ellipse at 50% 42%, transparent 60%, rgba(46, 80, 62, .07) 100%);
  --fx-fallback: radial-gradient(ellipse at 50% 45%, rgba(46, 158, 98, .09), transparent 62%);
  --nav-bg: rgba(243, 245, 241, .78);
  --hero-fade: linear-gradient(to top, rgba(243, 245, 241, .92), rgba(243, 245, 241, 0) 55%);
  --detail-bg: rgba(255, 255, 255, .90);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    color-scheme: light;
    --bg: #f3f5f1;
    --bg-elev: #fbfcfa;
    --ink: #152019;
    --ink-dim: rgba(21, 32, 25, .66);
    --ink-faint: rgba(21, 32, 25, .42);
    --line: rgba(20, 70, 45, .16);
    --line-strong: rgba(20, 70, 45, .42);
    --accent: #2E9E62;
    --accent-dim: #267a4d;
    --accent-deep: #bfe3d0;
    --accent-ink: #ffffff;
    --grid-line: rgba(20, 70, 45, .045);
    --grid-line-strong: rgba(20, 70, 45, .085);
    --glow: 0 0 10px rgba(46, 158, 98, .22);
    --vignette: radial-gradient(ellipse at 50% 42%, transparent 60%, rgba(46, 80, 62, .07) 100%);
    --fx-fallback: radial-gradient(ellipse at 50% 45%, rgba(46, 158, 98, .09), transparent 62%);
    --nav-bg: rgba(243, 245, 241, .78);
    --hero-fade: linear-gradient(to top, rgba(243, 245, 241, .92), rgba(243, 245, 241, 0) 55%);
    --detail-bg: rgba(255, 255, 255, .90);
  }
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: "GenSen Rounded", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
               "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background-color .45s ease, color .45s ease;
}

/* 全局细网格 + 暗角（HUD 语言，密度收敛） */
body::before {
  content: ""; position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px),
    linear-gradient(var(--grid-line-strong) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line-strong) 1px, transparent 1px);
  background-size: 96px 96px, 96px 96px, 480px 480px, 480px 480px;
}
body::after {
  content: ""; position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background: var(--vignette);
}

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

::selection { background: var(--accent); color: var(--accent-ink); }

h1, h2, h3, .philosophy blockquote {
  font-family: "GenSen Rounded", "Sora", "PingFang SC", -apple-system, sans-serif;
  font-weight: 600; line-height: 1.3; letter-spacing: .02em;
}
h4 {
  font-family: "GenSen Rounded", "Sora", "PingFang SC", -apple-system, sans-serif;
  font-weight: 600; line-height: 1.3; letter-spacing: .01em;
}

/* ---------- 通用 HUD 标签 ---------- */
.sec-tag {
  font-family: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 11px; letter-spacing: .32em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 18px;
}
.sec-tag::before { content: "// "; color: var(--ink-faint); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block; padding: 12px 26px;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 13px; letter-spacing: .12em;
  text-decoration: none; border: 1px solid transparent;
  cursor: pointer;
  transition: transform .25s cubic-bezier(.22, 1, .36, 1), box-shadow .25s ease,
              background-color .25s ease, border-color .25s ease;
}
button.btn { appearance: none; border-radius: 0; }
.btn-solid { background: var(--accent); color: var(--accent-ink); }
.btn-solid:hover { transform: translateY(-2px); box-shadow: var(--glow); }
.btn-ghost { border-color: var(--line-strong); color: var(--ink); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-lg { padding: 16px 40px; font-size: 14px; }

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  background: var(--nav-bg);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: 1160px; margin: 0 auto; padding: 0 28px;
  height: 58px; display: flex; align-items: center; gap: 28px;
}
.logo {
  font-family: "Sora", "PingFang SC", sans-serif; font-weight: 700;
  font-size: 18px; color: var(--ink); text-decoration: none; letter-spacing: .02em;
}
.logo-dot { color: var(--accent); }
.logo-cn {
  font-size: 11px; font-weight: 400; color: var(--ink-faint);
  margin-left: 8px; letter-spacing: .2em;
}
.nav-links { display: flex; gap: 24px; margin-left: auto; }
.nav-links a {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 12px; letter-spacing: .18em; color: var(--ink-dim);
  text-decoration: none; transition: color .2s ease;
}
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--accent); }
.theme-toggle {
  width: 34px; height: 34px; border: 1px solid var(--line-strong);
  background: transparent; color: var(--ink); font-size: 15px; line-height: 1;
  cursor: pointer; transition: border-color .2s ease, color .2s ease;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 100svh;
  display: flex; align-items: flex-end;
  overflow: hidden;
}
#hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.hero::after { /* 底部淡出，衔接正文 */
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 34%;
  background: var(--hero-fade); pointer-events: none;
}

.hero-hud { position: absolute; inset: 0; pointer-events: none; z-index: 2; }
.hud-frame { position: absolute; inset: 18px; border: 1px solid var(--line); }
.hud-frame::before, .hud-frame::after, .hud-frame .corner {
  content: ""; position: absolute; width: 10px; height: 10px;
  border: 1px solid var(--line-strong);
}
.hud-frame::before { top: -1px; left: -1px; border-right: none; border-bottom: none; }
.hud-frame::after { top: -1px; right: -1px; border-left: none; border-bottom: none; }
.hud-frame .c-bl { bottom: -1px; left: -1px; border-right: none; border-top: none; }
.hud-frame .c-br { bottom: -1px; right: -1px; border-left: none; border-top: none; }

.hud-tag {
  position: absolute;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 9px; letter-spacing: .16em; text-transform: uppercase;
  color: var(--ink-faint); white-space: nowrap;
}
.hud-tag b { color: var(--ink-dim); font-weight: 400; }
.tag-lt { top: 30px; left: 32px; }
.tag-rt { top: 30px; right: 32px; }
.tag-vertical {
  top: 50%; left: 26px; transform: translateY(-50%);
  writing-mode: vertical-rl; letter-spacing: .3em; font-size: 8px;
}
.tag-phase { bottom: 30px; right: 32px; letter-spacing: .26em; }
.tag-phase b { color: var(--accent); text-shadow: var(--glow); }
.hud-progress {
  position: absolute; left: 18px; right: 18px; bottom: 18px; height: 1px;
  background: var(--line);
}
.hud-progress i {
  position: absolute; left: 0; top: 0; bottom: 0; width: 0%;
  background: linear-gradient(90deg, var(--accent-deep), var(--accent));
  box-shadow: var(--glow);
}

/* ---------- INSPECT：焦点光环 + 标签 + 详情卡 ---------- */
.node-ring {
  position: absolute; z-index: 4; width: 86px; height: 86px;
  transform: translate(-50%, -50%);
  border: 1px solid var(--accent); border-radius: 50%;
  box-shadow: var(--glow);
  opacity: 0; transition: opacity .4s ease;
  pointer-events: none;
  animation: hero-spin 7s linear infinite;
}
.node-ring::before, .node-ring::after {
  content: ""; position: absolute; left: 50%; width: 1px; height: 9px;
  background: var(--accent);
}
.node-ring::before { top: -14px; }
.node-ring::after { bottom: -14px; }
.node-ring.show { opacity: .9; }
@keyframes hero-spin { to { transform: translate(-50%, -50%) rotate(360deg); } }
.node-ring-label {
  position: absolute; z-index: 4; transform: translate(14px, -50%);
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 9px; letter-spacing: .2em; color: var(--accent);
  text-shadow: var(--glow); white-space: nowrap;
  opacity: 0; transition: opacity .4s ease; pointer-events: none;
}
.node-ring-label.show { opacity: 1; }

.node-detail {
  position: absolute; z-index: 6; right: 5%; top: 50%;
  width: min(320px, 78vw);
  transform: translate(40px, -50%);
  opacity: 0; pointer-events: none;
  transition: opacity .55s ease, transform .55s cubic-bezier(.22, 1, .36, 1);
  border: 1px solid var(--line-strong);
  background: var(--detail-bg);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  padding: 18px 20px 14px;
}
.node-detail.show { opacity: 1; transform: translate(0, -50%); }
.node-detail::before {
  content: ""; position: absolute; left: -1px; top: 14px; bottom: 14px; width: 2px;
  background: var(--accent); box-shadow: var(--glow);
}
.nd-item { display: none; }
.nd-item.active { display: block; }
.d-title { font-family: "GenSen Rounded", "Sora", "PingFang SC", sans-serif; font-size: 15px; font-weight: 600; }
.d-title span { color: var(--ink-faint); font-size: 12px; font-weight: 400; }
.d-sub {
  margin-top: 5px;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 9px; letter-spacing: .18em; color: var(--accent-dim);
}
.d-list { margin-top: 12px; list-style: none; border-top: 1px solid var(--line); }
.d-list li {
  display: flex; gap: 12px; align-items: baseline;
  padding: 5px 0; font-size: 12px; color: var(--ink);
  border-bottom: 1px solid var(--line);
}
.d-list li i {
  font-style: normal; flex: none; min-width: 44px;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 9px; letter-spacing: .08em; color: var(--accent);
}
.d-foot {
  margin-top: 12px; padding-top: 8px; border-top: 1px solid var(--line);
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 8px; letter-spacing: .28em; color: var(--ink-faint);
  display: flex; justify-content: space-between;
}
.d-foot i { font-style: normal; color: var(--accent-dim); }

.hero-content {
  position: relative; z-index: 3;
  max-width: 1160px; width: 100%; margin: 0 auto;
  padding: 0 64px 14vh;
}
.hero-content h1 {
  font-size: clamp(38px, 6vw, 64px); font-weight: 600; letter-spacing: .04em;
}
.lede {
  margin-top: 14px; font-size: clamp(16px, 2.2vw, 21px); color: var(--ink-dim);
  font-family: "GenSen Rounded", "Sora", "PingFang SC", sans-serif;
}
.hero-desc { margin-top: 20px; max-width: 560px; font-size: 14px; color: var(--ink-faint); }
.cta-row { margin-top: 34px; display: flex; gap: 14px; flex-wrap: wrap; }
.hero-note {
  margin-top: 20px;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 11px; letter-spacing: .22em; color: var(--ink-faint);
}
.hero-note::before { content: "●"; color: var(--accent); margin-right: 8px; font-size: 8px; }

/* ---------- Section 通用 ---------- */
.section { max-width: 1160px; margin: 0 auto; padding: 110px 28px 0; }
.section-head { text-align: left; }
.section-head h2, .philosophy h2, .download h2 { font-size: clamp(28px, 4vw, 42px); }
.sec-desc { margin-top: 14px; max-width: 560px; color: var(--ink-dim); }

/* ---------- 功能区块 ---------- */
.feature {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 56px; align-items: center;
}
.feature--flip .feature-copy { order: 2; }
.feature--flip .fx-wrap { order: 1; }
.feature-copy h3 { font-size: clamp(22px, 3vw, 30px); margin-bottom: 16px; }
.feature-copy > p { color: var(--ink-dim); font-size: 15px; }
.spec-list { margin-top: 22px; list-style: none; border-top: 1px solid var(--line); }
.spec-list li {
  padding: 9px 0 9px 20px; position: relative;
  font-size: 13.5px; color: var(--ink-dim);
  border-bottom: 1px solid var(--line);
}
.spec-list li::before {
  content: ""; position: absolute; left: 2px; top: 17px;
  width: 6px; height: 6px; border: 1px solid var(--accent);
}
.spec-sources li { display: flex; align-items: center; gap: 4px; padding-left: 8px; }
.spec-sources li::before { display: none; }
.spec-sources .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--c); display: inline-block; margin-right: 10px;
  box-shadow: 0 0 6px var(--c);
}

.fx-wrap {
  position: relative; aspect-ratio: 4 / 3;
  border: 1px solid var(--line);
  background: var(--fx-fallback), var(--bg-elev);
  overflow: hidden;
}
.fx-wrap::before, .fx-wrap::after {
  content: ""; position: absolute; width: 10px; height: 10px; z-index: 2;
  border: 1px solid var(--line-strong); pointer-events: none;
}
.fx-wrap::before { top: -1px; left: -1px; border-right: none; border-bottom: none; }
.fx-wrap::after { bottom: -1px; right: -1px; border-left: none; border-top: none; }
.fx-canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.fx-label {
  position: absolute; left: 12px; bottom: 10px; z-index: 2;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 9px; letter-spacing: .22em; color: var(--ink-faint);
  pointer-events: none;
}

/* ---------- 理念区 ---------- */
.philosophy blockquote {
  max-width: 860px;
  font-size: clamp(22px, 3.4vw, 34px); font-weight: 600; line-height: 1.6;
  border-left: 2px solid var(--accent); padding-left: 28px;
}
.principle-grid {
  margin-top: 64px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.principle {
  border: 1px solid var(--line); padding: 26px 24px;
  background: var(--bg-elev);
  transition: border-color .3s ease, transform .3s ease;
}
.principle:hover { border-color: var(--accent); transform: translateY(-3px); }
.p-no {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 10px; letter-spacing: .3em; color: var(--accent); margin-bottom: 14px;
}
.principle h4 { font-size: 17px; margin-bottom: 8px; }
.principle p:last-child { font-size: 13px; color: var(--ink-dim); }

/* ---------- 下载区 ---------- */
.download { text-align: center; padding-bottom: 130px; }
.download-copy {
  max-width: 620px; margin: 18px auto 0;
  color: var(--ink-dim); font-size: 15px;
}
.dl-row {
  margin-top: 40px; display: flex; align-items: center; justify-content: center;
  gap: 22px; flex-wrap: wrap;
}
.download-grid {
  margin: 34px auto 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  text-align: left;
}
.download .download-grid {
  width: min(1040px, 100%);
}
.download-card {
  min-height: 292px;
  display: flex;
  flex-direction: column;
  padding: 18px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg-elev) 90%, transparent);
  color: var(--ink);
  transition: border-color .25s ease, transform .25s ease, background-color .25s ease;
}
.download-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  background: var(--bg-elev);
}
.download-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}
.download-group, .download-badge {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: .14em;
  white-space: nowrap;
}
.download-group { color: var(--accent); }
.download-badge {
  border: 1px solid var(--line-strong);
  padding: 4px 8px;
  color: var(--ink-dim);
}
.download-card h3 {
  font-size: 18px;
  letter-spacing: .02em;
}
.download-card p {
  margin-top: 10px;
  color: var(--ink-dim);
  font-size: 13px;
  line-height: 1.65;
}
.download-facts {
  margin-top: 18px;
  list-style: none;
  border-top: 1px solid var(--line);
}
.download-facts li {
  min-height: 31px;
  padding: 7px 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink-faint);
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: .08em;
}
.download-link {
  width: 100%;
  margin-top: auto;
  text-align: center;
  padding-inline: 14px;
  font-size: 11px;
  white-space: normal;
}
.dl-ios {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 12px; letter-spacing: .14em; color: var(--ink-faint);
  border: 1px dashed var(--line-strong); padding: 14px 22px;
}
.dl-note { margin-top: 24px; font-size: 13px; color: var(--ink-faint); }
.dl-note.is-active, .download-status.is-active { color: var(--accent); }

/* ---------- 下载中心页 ---------- */
.download-page-main {
  position: relative;
  z-index: 1;
  max-width: 1160px;
  margin: 0 auto;
  padding: 128px 28px 0;
}
.download-hero {
  max-width: 780px;
  padding: 28px 0 18px;
}
.download-hero h1 {
  font-size: clamp(38px, 6vw, 66px);
  letter-spacing: .03em;
}
.download-hero-copy {
  margin-top: 20px;
  max-width: 650px;
  color: var(--ink-dim);
  font-size: 16px;
}
.download-board {
  margin-top: 42px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 30px 0 34px;
}
.download-board-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}
.download-board-head .sec-tag { margin-bottom: 10px; }
.download-board-head h2 {
  font-size: clamp(24px, 3vw, 34px);
}
.download-board-head > p {
  color: var(--ink-faint);
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: .12em;
  text-align: right;
}
.download-board .download-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.download-board .download-card { min-height: 330px; }
.download-status {
  margin-top: 22px;
  color: var(--ink-faint);
  font-size: 13px;
}
.download-help {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.download-help article {
  border-top: 1px solid var(--line-strong);
  padding-top: 18px;
}
.download-help span {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: .22em;
  color: var(--accent);
}
.download-help h2 {
  margin-top: 10px;
  font-size: 18px;
}
.download-help p {
  margin-top: 8px;
  color: var(--ink-dim);
  font-size: 13px;
}

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--line); margin-top: 30px; }
.footer-inner {
  max-width: 1160px; margin: 0 auto; padding: 44px 28px;
  display: flex; justify-content: space-between; align-items: flex-end; gap: 24px;
  flex-wrap: wrap;
}
.f-slogan { margin-top: 6px; font-size: 13px; color: var(--ink-faint); }
.f-meta { text-align: right; font-size: 12px; color: var(--ink-faint); }
.f-icp { font-family: "IBM Plex Mono", ui-monospace, monospace; letter-spacing: .08em; }

/* ---------- 滚动 reveal（仅 JS 可用时先隐藏，无 JS 时内容直接可见） ---------- */
html.js .reveal {
  opacity: 0; transform: translateY(26px);
  transition: opacity .8s ease var(--d, 0s),
              transform .8s cubic-bezier(.22, 1, .36, 1) var(--d, 0s);
}
html.js .reveal.in { opacity: 1; transform: translateY(0); }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .download-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
  .feature { grid-template-columns: 1fr; gap: 30px; }
  .feature--flip .feature-copy { order: 1; }
  .feature--flip .fx-wrap { order: 2; }
  .principle-grid { grid-template-columns: 1fr; }
  .hero-content { padding: 0 34px 16vh; }
  .tag-vertical, .tag-rt { display: none; }
  .nav-inner { padding: 0 20px; }
  .logo-cn { display: none; }
  .section { padding: 84px 20px 0; }
  .download-page-main { padding: 104px 20px 0; }
  .download-board-head {
    display: block;
  }
  .download-board-head > p {
    margin-top: 14px;
    text-align: left;
  }
  .download-board .download-grid,
  .download-grid,
  .download-help {
    grid-template-columns: 1fr;
  }
  .download-card,
  .download-board .download-card {
    min-height: 0;
  }
  .node-detail {
    right: 50%; top: auto; bottom: 8%;
    transform: translate(50%, 40px);
  }
  .node-detail.show { transform: translate(50%, 0); }
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  html.js .reveal { opacity: 1; transform: none; transition: none; }
  .btn, .principle, .nav-links a, .theme-toggle { transition: none; }
}