/* ============================================================
   电脑开荒官网 — Fluent Design 风格
   与软件界面同语言：Segoe UI / Fluent 蓝 #0078D4 / 卡片圆角 / 明暗跟随系统
   ============================================================ */

:root {
  --accent: #0078D4;
  --accent-hover: #106EBE;
  --accent-pressed: #005BA1;
  --accent-text: #0067C0;
  --ok: #0F7B0F;

  --bg: #f5f7fa;
  --bg-soft: #eef2f7;
  --card: #ffffff;
  --card-soft: #fafbfd;
  --stroke: rgba(28, 47, 74, 0.10);
  --stroke-strong: rgba(28, 47, 74, 0.16);
  --text: #1b1f27;
  --text-2: #4e5665;
  --text-3: #79828f;

  --nav-bg: rgba(255, 255, 255, 0.78);
  --hero-top: #e8f1fb;
  --code-bg: #f0f3f7;

  --shadow-sm: 0 1px 2px rgba(16, 30, 54, 0.06), 0 2px 8px rgba(16, 30, 54, 0.05);
  --shadow-md: 0 2px 6px rgba(16, 30, 54, 0.07), 0 10px 28px rgba(16, 30, 54, 0.08);
  --shadow-lg: 0 8px 20px rgba(16, 30, 54, 0.10), 0 24px 64px rgba(16, 30, 54, 0.16);

  --radius: 10px;
  --radius-lg: 14px;

  --font: "Segoe UI Variable Display", "Segoe UI", "Microsoft YaHei UI",
          "PingFang SC", system-ui, -apple-system, "Helvetica Neue", sans-serif;
  --mono: "Cascadia Mono", Consolas, "JetBrains Mono", "Courier New", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --accent: #2B9CE6;
    --accent-hover: #4CAEEC;
    --accent-pressed: #1E86CF;
    --accent-text: #6CC7FF;

    --bg: #1d2026;
    --bg-soft: #17191e;
    --card: #262a31;
    --card-soft: #22262c;
    --stroke: rgba(255, 255, 255, 0.09);
    --stroke-strong: rgba(255, 255, 255, 0.16);
    --text: #f0f2f5;
    --text-2: #a5adb8;
    --text-3: #78808c;

    --nav-bg: rgba(29, 32, 38, 0.80);
    --hero-top: #202736;
    --code-bg: #1b1e23;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.30), 0 2px 8px rgba(0, 0, 0, 0.22);
    --shadow-md: 0 2px 6px rgba(0, 0, 0, 0.32), 0 10px 28px rgba(0, 0, 0, 0.30);
    --shadow-lg: 0 8px 20px rgba(0, 0, 0, 0.34), 0 24px 64px rgba(0, 0, 0, 0.42);
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

h1, h2, h3 { margin: 0; line-height: 1.25; letter-spacing: -0.01em; }
p { margin: 0; }
a { color: var(--accent-text); text-decoration: none; }
a:hover { text-decoration: underline; }
code {
  font-family: var(--mono);
  font-size: 0.92em;
  background: var(--code-bg);
  border: 1px solid var(--stroke);
  border-radius: 5px;
  padding: 1px 6px;
}

.container {
  width: min(1120px, 92%);
  margin-inline: auto;
}
.container-narrow { width: min(860px, 92%); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font: 600 15px/1 var(--font);
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease,
              border-color 0.15s ease, color 0.15s ease;
  text-decoration: none;
  white-space: nowrap;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:active { background: var(--accent-pressed); }

.btn-secondary {
  background: var(--card);
  border-color: var(--stroke-strong);
  box-shadow: var(--shadow-sm);
}
.btn-secondary:hover { background: var(--bg-soft); }

.btn-lg { padding: 14px 28px; font-size: 16px; border-radius: 11px; }
.btn-sm { padding: 8px 16px; font-size: 14px; }
.btn-block { width: 100%; }

.btn-ghost {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 4px 12px;
  font: 600 12px/1.4 var(--font);
  color: var(--text-2);
  background: var(--card);
  border: 1px solid var(--stroke-strong);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}
.btn-ghost:hover { color: var(--text); border-color: var(--accent); }
.btn-ghost.copied { color: var(--ok); border-color: var(--ok); }
.btn-ghost.failed { color: #c42b1c; border-color: #c42b1c; }

/* ---------- 导航 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  -webkit-backdrop-filter: blur(18px) saturate(1.5);
  backdrop-filter: blur(18px) saturate(1.5);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.nav.scrolled {
  border-bottom-color: var(--stroke);
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
}
.brand:hover { text-decoration: none; }
.brand-mark { border-radius: 7px; box-shadow: var(--shadow-sm); }
.brand-name { white-space: nowrap; }

.nav-links {
  display: flex;
  gap: 4px;
  margin-right: auto;
}
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 40px;
  height: 40px;
  padding: 0 8px;
  margin-left: 4px;
  background: transparent;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 2px;
  border-radius: 1px;
  background: var(--text);
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.nav-links a {
  padding: 8px 14px;
  border-radius: 8px;
  color: var(--text-2);
  font-size: 14.5px;
  font-weight: 600;
  transition: background 0.15s ease, color 0.15s ease;
}
.nav-links a:hover {
  color: var(--text);
  background: var(--bg-soft);
  text-decoration: none;
}

/* ---------- Hero ---------- */
.hero {
  background:
    radial-gradient(720px 380px at 82% -90px, rgba(0, 120, 212, 0.15), transparent 62%),
    radial-gradient(560px 300px at -70px 30px, rgba(0, 183, 195, 0.10), transparent 60%),
    linear-gradient(180deg, var(--hero-top) 0%, var(--bg) 86%);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
  align-items: center;
  gap: 48px;
  padding: 72px 0 88px;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}
.badge {
  display: inline-flex;
  align-items: center;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--card);
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow-sm);
  color: var(--text-2);
  font-size: 12.5px;
  font-weight: 600;
}
.badge-soft {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border-color: color-mix(in srgb, var(--accent) 30%, transparent);
  color: var(--accent-text);
}

.hero h1 {
  font-size: clamp(44px, 5.6vw, 66px);
  font-weight: 800;
  letter-spacing: -0.02em;
}
.tagline {
  margin-top: 10px;
  font-size: clamp(18px, 2.2vw, 23px);
  font-weight: 600;
  color: var(--accent-text);
}
.lead {
  margin-top: 18px;
  font-size: 16.5px;
  color: var(--text-2);
  max-width: 34em;
}
.lead strong { color: var(--text); }

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.hero-promises {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 22px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  color: var(--text-2);
  font-size: 14px;
  font-weight: 600;
}

/* 应用窗口式截图框（显式 height:auto，防止 attribute 高度被误用导致拉伸变形） */
.window {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow-lg);
  background: var(--card);
}
.window img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
}

/* ---------- 区块通用 ---------- */
.section { padding: 92px 0; }
.section-head { margin-bottom: 44px; }
.eyebrow {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--accent-text);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
}
.section-head h2 {
  font-size: clamp(27px, 3.4vw, 36px);
  font-weight: 750;
}
.section-lead {
  margin-top: 12px;
  color: var(--text-2);
  font-size: 16px;
  max-width: 40em;
}

/* ---------- 网格与卡片 ---------- */
.grid {
  display: grid;
  gap: 20px;
}
.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.card {
  background: var(--card);
  border: 1px solid var(--stroke);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.promise { padding: 30px 28px; text-align: center; }
.promise-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  display: grid;
  place-items: center;
  font-size: 26px;
  border-radius: 14px;
  background: color-mix(in srgb, var(--accent) 9%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 18%, transparent);
}
.promise h3 { font-size: 17.5px; }
.promise p { margin-top: 10px; color: var(--text-2); font-size: 14.5px; }

.feature { padding: 26px 24px; }
.feature:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: color-mix(in srgb, var(--accent) 35%, var(--stroke));
}

/* 「开源透明」横贯全宽的背书条，不占模块网格位 */
.feature-wide {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 46px 1fr;
  column-gap: 18px;
  row-gap: 6px;
  align-items: start;
  padding: 22px 24px;
  background: color-mix(in srgb, var(--accent) 6%, var(--card));
  border-color: color-mix(in srgb, var(--accent) 22%, var(--stroke));
}
.feature-wide:hover {
  border-color: color-mix(in srgb, var(--accent) 40%, var(--stroke));
}
.feature-wide .feature-icon {
  grid-row: 1 / span 2;
  margin-bottom: 0;
}
.feature-wide h3 { grid-column: 2; }
.feature-wide p { grid-column: 2; margin-top: 0; }
.feature-icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  font-size: 22px;
  border-radius: 12px;
  background: color-mix(in srgb, var(--accent) 9%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 18%, transparent);
  margin-bottom: 16px;
}
.feature h3 { font-size: 17px; }
.feature p { margin-top: 9px; color: var(--text-2); font-size: 14px; }

/* ---------- 截图 Tab ---------- */
.gallery-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}
.gallery-tab {
  padding: 9px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--stroke-strong);
  background: var(--card);
  color: var(--text-2);
  font: 600 14px/1 var(--font);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all 0.16s ease;
}
.gallery-tab:hover { color: var(--text); transform: translateY(-1px); }
.gallery-tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.gallery-figure {
  margin: 0 auto;
  max-width: 980px;
}
.gallery-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow-lg);
  cursor: zoom-in;
}
.gallery-figure figcaption {
  margin-top: 14px;
  text-align: center;
  color: var(--text-2);
  font-size: 14px;
}

/* ---------- 视频 ---------- */
.video-frame {
  margin: 0 auto;
  max-width: 980px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow-lg);
  background: #000;
}
.video-frame video { width: 100%; display: block; }

/* ---------- 下载 ---------- */
.dl-card {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 40px;
  padding: 38px;
}
/* 允许 grid 子项收窄：防止内部 nowrap 代码块把卡片撑出视口 */
.dl-main, .dl-side { min-width: 0; }

.dl-file {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 22px;
}
.dl-file img { border-radius: 10px; }
.dl-filename { font-size: 21px; font-weight: 700; margin-right: 10px; }

.dl-meta { margin: 0 0 26px; display: grid; gap: 12px; }
.dl-meta > div {
  display: grid;
  grid-template-columns: 76px 1fr;
  gap: 14px;
  align-items: baseline;
}
.dl-meta dt {
  color: var(--text-3);
  font-size: 13.5px;
  font-weight: 600;
}
.dl-meta dd { margin: 0; font-size: 14.5px; }

.dl-note {
  margin-top: 14px;
  color: var(--text-2);
  font-size: 13.5px;
  text-align: center;
}

/* ---- 多渠道下载 ---- */
.dl-alt { margin-top: 16px; }
.dl-alt-label {
  display: block;
  margin-bottom: 9px;
  color: var(--text-3);
  font-size: 12.5px;
  font-weight: 600;
}
.dl-alt-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.dl-alt-row .btn {
  padding: 8px 16px;
  font-size: 13.5px;
}
.dl-count {
  margin-top: 14px;
  color: var(--text-2);
  font-size: 13px;
  text-align: center;
}
.dl-count strong { color: var(--text); }

[hidden] { display: none !important; }

.steps {
  margin: 0 0 30px;
  padding: 0;
  list-style: none;
  counter-reset: step;
  display: grid;
  gap: 14px;
}
.steps li {
  counter-increment: step;
  position: relative;
  padding-left: 42px;
  color: var(--text-2);
  font-size: 14.5px;
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 1px;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
}
.steps strong { color: var(--text); }

.dl-side h3 {
  font-size: 16px;
  margin-bottom: 14px;
}
.dl-side h3 + .steps { margin-top: 14px; }
.dl-hash-label { color: var(--text-2); font-size: 13.5px; margin-bottom: 8px; }

.code {
  position: relative;
  margin: 0 0 18px;
  padding: 14px 96px 14px 16px;
  background: var(--code-bg);
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  overflow-x: auto;
}
.code code {
  font-size: 13px;
  background: none;
  border: none;
  padding: 0;
  white-space: nowrap;
}
.code-hash code { word-break: break-all; white-space: normal; }

.trust-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 30px;
}
.trust-chip {
  padding: 7px 16px;
  border-radius: 999px;
  border: 1px solid var(--stroke);
  background: var(--card-soft);
  color: var(--text-2);
  font-size: 13px;
  font-weight: 600;
}

/* ---------- FAQ ---------- */
.faq-item {
  background: var(--card);
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 17px 22px;
  font-size: 15.5px;
  font-weight: 650;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: background 0.15s ease;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { background: var(--card-soft); }
.faq-item summary::after {
  content: "+";
  flex: none;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  color: var(--accent-text);
  font-size: 17px;
  font-weight: 700;
  transition: transform 0.2s ease;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-body {
  padding: 0 22px 18px;
  color: var(--text-2);
  font-size: 14.5px;
}
.faq-body p + p { margin-top: 10px; }
.faq-body strong { color: var(--text); }

/* ---------- 页脚 ---------- */
.footer {
  background: var(--bg-soft);
  border-top: 1px solid var(--stroke);
  padding: 52px 0 36px;
  margin-top: 20px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.75fr 1.1fr;
  gap: 44px;
  align-items: start;
}
.footer-col { min-width: 0; }
.footer-heading {
  margin: 2px 0 14px;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text-3);
}
.footer-brand .brand { font-size: 16px; margin-bottom: 12px; }
.footer-desc {
  margin-top: 12px;
  color: var(--text-2);
  font-size: 14px;
}
.footer-domain { margin-top: 10px; font-size: 14px; font-weight: 600; }
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-links a {
  padding: 8px 14px;
  border-radius: 8px;
  color: var(--text-2);
  font-size: 14px;
  font-weight: 600;
}
.footer-links a:hover { color: var(--text); background: var(--card); text-decoration: none; }

.author-card {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 11px 18px 11px 12px;
  border-radius: 12px;
  background: var(--card);
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow-sm);
  transition: transform 0.16s ease, box-shadow 0.16s ease, border-color 0.16s ease;
}
.author-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: rgba(251, 114, 153, 0.45);
  text-decoration: none;
}
.author-avatar {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: #fb7299;
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.author-text strong {
  display: block;
  font-size: 15px;
  color: var(--text);
}
.author-text span {
  display: block;
  font-size: 12.5px;
  color: var(--text-2);
}
.author-note {
  margin-top: 12px;
  font-size: 12.5px;
  color: var(--text-3);
  max-width: 30em;
}

.footer-bottom {
  margin-top: 36px;
  padding-top: 22px;
  border-top: 1px solid var(--stroke);
  color: var(--text-3);
  font-size: 13px;
  display: grid;
  gap: 8px;
}
.footer-legal { max-width: 60em; line-height: 1.8; }

/* ---------- 回到顶部 ---------- */
.to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--stroke-strong);
  background: var(--nav-bg);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  backdrop-filter: blur(14px) saturate(1.4);
  color: var(--text);
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease, background 0.15s ease;
}
.to-top.show {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}
.to-top:hover { background: var(--card); }
.to-top:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent);
}

@media (max-width: 820px) {
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
}

/* ---------- 大图查看 ---------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
  background: rgba(8, 12, 20, 0.78);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  cursor: zoom-out;
}
.lightbox[hidden] { display: none; }
.lightbox img {
  max-width: 94vw;
  max-height: 90vh;
  border-radius: 10px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
}
.lightbox-close {
  position: fixed;
  top: 18px;
  right: 22px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.28);
  background: rgba(255, 255, 255, 0.10);
  color: #fff;
  font-size: 17px;
  cursor: pointer;
  transition: background 0.15s ease;
}
.lightbox-close:hover { background: rgba(255, 255, 255, 0.22); }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 56px 0 72px;
  }
  .hero-visual { order: -1; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .dl-card { grid-template-columns: 1fr; gap: 34px; padding: 30px; }
}

@media (max-width: 640px) {
  .nav-inner { gap: 10px; }
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 2px;
    padding: 10px 4%;
    margin: 0;
    background: var(--nav-bg);
    -webkit-backdrop-filter: blur(18px) saturate(1.5);
    backdrop-filter: blur(18px) saturate(1.5);
    border-bottom: 1px solid var(--stroke);
    box-shadow: var(--shadow-md);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; font-size: 15px; }
  .nav-toggle { display: flex; }
  .section { padding: 64px 0; }
  .grid-3 { grid-template-columns: 1fr; }
  .hero-cta .btn { width: 100%; }
  .dl-card { padding: 24px; }
  .code { padding-right: 76px; }
}

/* ============================================================
   反馈与收录页（feedback.html）
   ============================================================ */

.container-mid { width: min(940px, 92%); }

.nav-links a.active {
  color: var(--text);
  background: var(--bg-soft);
}

.fb-hero {
  background:
    radial-gradient(640px 300px at 85% -70px, rgba(0, 120, 212, 0.13), transparent 62%),
    linear-gradient(180deg, var(--hero-top) 0%, var(--bg) 100%);
  padding: 56px 0 64px;
}
.fb-hero h1 {
  font-size: clamp(30px, 4vw, 42px);
  font-weight: 750;
}
.fb-hero .lead {
  margin-top: 14px;
  color: var(--text-2);
  font-size: 16px;
  max-width: 40em;
}
.fb-hero .lead strong { color: var(--text); }

.fb-section { padding: 8px 0 96px; }

/* ---- 类型选择卡 ---- */
.fb-typecards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-bottom: 28px;
}
.fb-typecard {
  position: relative;
  display: block;
  text-align: left;
  padding: 24px 22px 20px;
  border-radius: var(--radius-lg);
  background: var(--card);
  border: 1px solid var(--stroke-strong);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  font: inherit;
  color: var(--text);
  transition: transform 0.16s ease, box-shadow 0.16s ease,
              border-color 0.16s ease, background 0.16s ease;
}
.fb-typecard:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.fb-typecard.active {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 6%, var(--card));
}
.fb-typecard-icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  font-size: 22px;
  border-radius: 12px;
  background: color-mix(in srgb, var(--accent) 9%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 18%, transparent);
}
.fb-typecard h3 { font-size: 18px; margin-top: 16px; }
.fb-typecard p { margin-top: 6px; color: var(--text-2); font-size: 14px; }
.fb-typecard-check {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  opacity: 0;
  transform: scale(0.6);
  transition: opacity 0.18s ease, transform 0.18s ease;
}
.fb-typecard.active .fb-typecard-check {
  opacity: 1;
  transform: scale(1);
}

/* ---- 表单 ---- */
.fb-form {
  display: none;
  grid-template-columns: 1fr 1fr;
  gap: 18px 20px;
}
.fb-form.visible { display: grid; }

.fb-field {
  display: flex;
  flex-direction: column;
  gap: 7px;
  min-width: 0;
}
.fb-field--full { grid-column: 1 / -1; }
.fb-field label { font-size: 13.5px; font-weight: 600; color: var(--text); }
.req { color: #c42b1c; font-weight: 700; }
.fb-hint { font-size: 12.5px; color: var(--text-3); }
.fb-hint code { font-size: 12px; }

.fb-field input[type="text"],
.fb-field select,
.fb-field textarea {
  width: 100%;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--stroke-strong);
  background: var(--card);
  color: var(--text);
  font: 400 14.5px/1.6 var(--font);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.fb-field input:focus,
.fb-field select:focus,
.fb-field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}
.fb-field textarea {
  min-height: 96px;
  resize: vertical;
}
/* 「复现步骤」三行示例占位需要更高的默认高度 */
#fSteps { min-height: 122px; }
.fb-field select {
  appearance: none;
  -webkit-appearance: none;
  padding-right: 38px;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 16 16' fill='none' stroke='%2376808c' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m4 6 4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
}

.fb-checks {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
}
.fb-check {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14.5px;
  cursor: pointer;
}
.fb-check input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
  cursor: pointer;
}

.fb-criteria {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 18px;
  border-radius: var(--radius);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, var(--stroke));
  background: color-mix(in srgb, var(--accent) 6%, var(--card));
  font-size: 13.5px;
}
.fb-criteria strong { font-size: 14px; }
.fb-criteria span { color: var(--text-2); }

.fb-invalid input,
.fb-invalid textarea {
  border-color: #c42b1c;
  box-shadow: 0 0 0 3px rgba(196, 43, 28, 0.14);
}

/* ---- 生成结果 ---- */
.fb-result {
  margin-top: 30px;
  padding: 26px;
}
.fb-result h3 { font-size: 17px; }
.fb-result .fb-hint { margin: 6px 0 14px; }

#fbOutput {
  width: 100%;
  min-height: 180px;
  padding: 14px 16px;
  border-radius: 8px;
  border: 1px solid var(--stroke);
  background: var(--code-bg);
  color: var(--text);
  font: 400 13px/1.75 var(--mono);
  resize: vertical;
}
.fb-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}
.fb-msg {
  margin-top: 12px;
  min-height: 1.2em;
  font-size: 13.5px;
  font-weight: 600;
  color: #c42b1c;
}
.fb-note {
  margin-top: 8px;
  font-size: 13px;
  color: var(--text-2);
}
.fb-note strong { color: var(--text); }

@media (max-width: 760px) {
  .fb-form.visible { grid-template-columns: 1fr; }
  .fb-typecards { grid-template-columns: 1fr; }
  .fb-result { padding: 20px; }
}

/* 尊重减少动态效果偏好 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
}