:root {
  color-scheme: dark light;

  --bg: #0c0d10;
  --bg-panel: #14161b;
  --bg-elevated: #1b1e25;
  --bg-subtle: rgba(255, 255, 255, 0.045);
  --bg-hover: rgba(255, 255, 255, 0.07);
  --text: #ededf0;
  --text-2: #9ca1ae;
  --text-3: #666c7a;
  --line: rgba(255, 255, 255, 0.085);
  --line-strong: rgba(255, 255, 255, 0.16);

  --btn-bg: #f4f4f6;
  --btn-fg: #0c0d10;
  --btn-hover: #ffffff;

  --accent: #4f7cff;
  --rose: #f04468;
  --green: #2ebd7f;
  --amber: #e89b25;

  --shadow-panel: 0 26px 70px rgba(0, 0, 0, 0.62), 0 0 0 1px rgba(255, 255, 255, 0.09);
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #fbfbfc;
  --bg-panel: #ffffff;
  --bg-elevated: #f3f4f7;
  --bg-subtle: rgba(15, 18, 28, 0.04);
  --bg-hover: rgba(15, 18, 28, 0.065);
  --text: #14161c;
  --text-2: #525866;
  --text-3: #848b99;
  --line: rgba(15, 18, 28, 0.085);
  --line-strong: rgba(15, 18, 28, 0.16);

  --btn-bg: #14161c;
  --btn-fg: #ffffff;
  --btn-hover: #262a35;

  --accent: #2b5ce6;
  --rose: #d92d53;
  --green: #158f59;
  --amber: #c2780e;

  --shadow-panel: 0 24px 60px rgba(15, 18, 28, 0.11), 0 0 0 1px rgba(15, 18, 28, 0.08);
}

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

html {
  scroll-padding-top: 72px;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;

  @media (prefers-reduced-motion: no-preference) {
    scroll-behavior: smooth;
  }
}

body {
  margin: 0;
  padding-top: 64px;
}

code,
kbd,
.mono {
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
}

.wrap {
  width: min(1060px, calc(100% - 40px));
  margin-inline: auto;
}

/* 顶栏：克制干净，无花哨发光 */
.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  z-index: 40;
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, height 0.2s ease;
}

.topbar.is-scrolled {
  height: 56px;
  border-bottom-color: var(--line);
}

@supports ((animation-timeline: scroll()) and (animation-range: 0% 100%)) {
  @media (prefers-reduced-motion: no-preference) {
    @keyframes nav-compact {
      to {
        height: 56px;
        border-bottom-color: var(--line);
      }
    }
    .topbar {
      animation: nav-compact auto linear both;
      animation-timeline: scroll(block root);
      animation-range: 0px 80px;
    }
  }
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  font-size: 0.98rem;
  letter-spacing: -0.01em;
}

.brand img {
  width: 28px;
  height: 28px;
  border-radius: 7px;
}

.ver-tag {
  font-size: 0.74rem;
  font-weight: 500;
  color: var(--text-3);
}

.nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav a,
.nav button {
  background: none;
  border: none;
  padding: 0;
  color: var(--text-2);
  font: inherit;
  font-size: 0.88rem;
  text-decoration: none;
  cursor: pointer;
  transition: color 0.15s ease;
}

.nav a:hover,
.nav button:hover {
  color: var(--text);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-btn {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text-2);
  display: grid;
  place-items: center;
  cursor: pointer;
}

.theme-btn:hover {
  color: var(--text);
  border-color: var(--line-strong);
}

/* 按钮：原生高对比实色，拒绝廉价霓虹渐变 */
.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--btn-bg);
  color: var(--btn-fg);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.94rem;
  padding: 11px 20px;
  border-radius: 10px;
  border: 1px solid transparent;
  transition: background-color 0.15s ease;
}

.btn-download:hover {
  background: var(--btn-hover);
}

.btn-download-sm {
  padding: 6px 13px;
  font-size: 0.82rem;
  border-radius: 8px;
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line-strong);
  font-weight: 500;
  font-size: 0.92rem;
  padding: 11px 18px;
  border-radius: 10px;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.btn-ghost:hover {
  background: var(--bg-subtle);
}

/* 首屏：左对齐平实排版，像独立开发者作品而非营销模板 */
.hero {
  padding: 56px 0 48px;
}

.hero-top {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: end;
  margin-bottom: 38px;
}

.hero h1 {
  margin: 0 0 14px;
  font-size: clamp(2rem, 3.8vw, 2.85rem);
  line-height: 1.18;
  letter-spacing: -0.03em;
  font-weight: 700;
}

.hero-lead {
  margin: 0;
  color: var(--text-2);
  font-size: 1.02rem;
  max-width: 540px;
}

.hero-cta-box {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  padding: 20px 22px;
  border-radius: 14px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  width: 100%;
}

.meta-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  font-size: 0.78rem;
  color: var(--text-3);
}

.copy-inline {
  background: none;
  border: none;
  padding: 0;
  color: var(--text-2);
  font-family: "SF Mono", ui-monospace, Menlo, monospace;
  font-size: 0.75rem;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--line-strong);
}

.copy-inline:hover {
  color: var(--text);
}

/* 桌面舞台与可交互面板预览（全 SVG 矢量图标，零 Emoji） */
.stage {
  padding: 22px;
  border-radius: 18px;
  background:
    radial-gradient(circle at 18% 0%, rgba(79, 124, 255, 0.11), transparent 55%),
    var(--bg-elevated);
  border: 1px solid var(--line);
}

.panel-sim {
  border-radius: 14px;
  background: var(--bg-panel);
  box-shadow: var(--shadow-panel);
  overflow: hidden;
}

.sim-top {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 14px;
  border-bottom: 1px solid var(--line);
}

.sim-top img {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  flex-shrink: 0;
}

.sim-search {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 11px;
  border-radius: 9px;
  background: var(--bg-subtle);
  border: 1px solid var(--line);
  color: var(--text-3);
}

.sim-search:focus-within {
  border-color: var(--accent);
}

.sim-search input {
  width: 100%;
  border: none;
  outline: none;
  background: transparent;
  color: var(--text);
  font-size: 0.86rem;
}

.sim-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--bg-subtle);
  color: var(--text-2);
  font-size: 0.76rem;
  font-weight: 500;
  cursor: pointer;
}

.sim-btn:hover {
  color: var(--text);
  border-color: var(--line-strong);
}

.sim-tabs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 14px;
  border-bottom: 1px solid var(--line);
}

.tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tab-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text-2);
  font-size: 0.76rem;
  font-weight: 500;
  cursor: pointer;
}

.tab-pill:hover {
  background: var(--bg-subtle);
  color: var(--text);
}

.tab-pill.active {
  background: var(--bg-hover);
  border-color: var(--line-strong);
  color: var(--text);
  font-weight: 600;
}

.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  display: inline-block;
}

.sim-split {
  display: grid;
  grid-template-columns: 330px 1fr;
  min-height: 344px;
}

.sim-sidebar {
  border-right: 1px solid var(--line);
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sim-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 9px;
  cursor: pointer;
  border: 1px solid transparent;
}

.sim-row:hover {
  background: var(--bg-subtle);
}

.sim-row.selected {
  background: color-mix(in srgb, var(--accent) 13%, transparent);
  border-color: color-mix(in srgb, var(--accent) 36%, transparent);
}

.row-badge-box {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  background: var(--bg-subtle);
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  color: var(--text-2);
  flex-shrink: 0;
}

.sim-row-body {
  flex: 1;
  min-width: 0;
}

.sim-row-title {
  font-size: 0.83rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sim-row-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 2px;
  font-size: 0.71rem;
  color: var(--text-3);
}

.tag-mini {
  padding: 0 5px;
  border-radius: 4px;
  background: var(--bg-subtle);
  color: var(--text-2);
  font-size: 0.67rem;
}

.tag-cred {
  color: var(--rose);
  background: color-mix(in srgb, var(--rose) 12%, transparent);
}

.kbd {
  font-size: 0.68rem;
  padding: 1px 5px;
  border-radius: 4px;
  border: 1px solid var(--line);
  color: var(--text-3);
  background: var(--bg-subtle);
}

.sim-detail {
  display: flex;
  flex-direction: column;
}

.sim-detail-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--line);
  font-size: 0.78rem;
  color: var(--text-2);
}

.sim-detail-body {
  padding: 16px;
  flex: 1;
}

.sim-code {
  margin: 0;
  padding: 14px 16px;
  border-radius: 10px;
  background: var(--bg-subtle);
  border: 1px solid var(--line);
  font-family: "SF Mono", ui-monospace, Menlo, monospace;
  font-size: 0.8rem;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-all;
  color: var(--text);
}

.sim-deck {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 10px;
  padding: 14px;
  min-height: 260px;
}

.sim-card {
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--bg-subtle);
  overflow: hidden;
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.sim-card.selected {
  border-color: var(--accent);
}

.sim-card-top {
  padding: 7px 10px;
  font-size: 0.74rem;
  font-weight: 600;
  color: #fff;
  display: flex;
  justify-content: space-between;
}

.sim-card-text {
  padding: 10px;
  font-size: 0.75rem;
  color: var(--text-2);
  font-family: "SF Mono", ui-monospace, Menlo, monospace;
  white-space: pre-wrap;
  flex: 1;
}

.sim-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 14px;
  border-top: 1px solid var(--line);
  font-size: 0.73rem;
  color: var(--text-3);
}

.sim-foot-keys {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 章节：干净细线分隔，双栏平实叙述 */
.block {
  padding: 64px 0;
  border-top: 1px solid var(--line);
}

.block-header {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 36px;
}

.block-label h2 {
  margin: 0 0 8px;
  font-size: 1.38rem;
  letter-spacing: -0.02em;
}

.block-label p {
  margin: 0;
  color: var(--text-3);
  font-size: 0.88rem;
}

.feature-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px 36px;
}

.feature-item h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.feature-item p {
  margin: 0;
  color: var(--text-2);
  font-size: 0.9rem;
}

/* 快捷键与规格速查表 */
.spec-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.spec-box {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px 22px;
}

.spec-box h3 {
  margin: 0 0 14px;
  font-size: 0.94rem;
  color: var(--text);
}

.kv-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0;
  border-top: 1px solid var(--line);
  font-size: 0.86rem;
}

.kv-row:first-of-type {
  border-top: none;
  padding-top: 0;
}

.kv-row span:first-child {
  color: var(--text-2);
}

/* 安装说明 */
.install-notes {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.note-box {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
}

.note-box h3 {
  margin: 0 0 6px;
  font-size: 0.95rem;
}

.note-box p {
  margin: 0;
  color: var(--text-2);
  font-size: 0.88rem;
}

.cmd-bar {
  margin-top: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 8px;
  background: var(--bg-subtle);
  border: 1px solid var(--line);
  font-family: "SF Mono", ui-monospace, Menlo, monospace;
  font-size: 0.8rem;
  cursor: pointer;
}

.cmd-bar:hover {
  border-color: var(--line-strong);
}

/* 页脚 */
.footer {
  padding: 36px 0 48px;
  border-top: 1px solid var(--line);
  font-size: 0.83rem;
  color: var(--text-3);
}

.footer-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a,
.footer-links button {
  background: none;
  border: none;
  padding: 0;
  font: inherit;
  color: var(--text-2);
  text-decoration: none;
  cursor: pointer;
}

.footer-links a:hover,
.footer-links button:hover {
  color: var(--text);
}

/* Top-Layer Dialog */
dialog.modal {
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 16px;
  background: var(--bg-panel);
  color: var(--text);
  width: min(480px, calc(100% - 32px));
  box-shadow: var(--shadow-panel);
  opacity: 0;
  transition-property: opacity, transform, display, overlay;
  transition-duration: 0.22s;
  transition-timing-function: ease-out;
  transition-behavior: allow-discrete;

  @media (prefers-reduced-motion: no-preference) {
    transform: translateY(6px) scale(0.97);
  }
}

dialog.modal::backdrop {
  background-color: rgb(0 0 0 / 0);
  backdrop-filter: blur(4px);
  transition-property: background-color, display, overlay;
  transition-duration: 0.22s;
  transition-timing-function: ease-out;
  transition-behavior: allow-discrete;
}

:is(dialog.modal[open]):where(:not([data-closing])) {
  opacity: 1;

  @starting-style {
    opacity: 0;
  }

  @media (prefers-reduced-motion: no-preference) {
    transform: translateY(0) scale(1);

    @starting-style {
      transform: translateY(6px) scale(0.97);
    }
  }

  &::backdrop {
    background-color: rgb(0 0 0 / 0.55);

    @starting-style {
      background-color: transparent;
    }
  }
}

@media (prefers-reduced-motion: reduce) {
  dialog.modal,
  dialog.modal::backdrop {
    transition-duration: 0.1s;
  }
}

.modal-inner {
  padding: 22px 24px;
}

.modal-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.modal-top h3 {
  margin: 0;
  font-size: 1.05rem;
}

.qr-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 16px;
}

.qr-card {
  background: #fff;
  color: #14161c;
  border-radius: 12px;
  padding: 12px;
  text-align: center;
  border: 1px solid rgba(0, 0, 0, 0.08);
}

.qr-card img {
  width: 100%;
  max-width: 160px;
  aspect-ratio: 1 / 1;
  display: block;
  margin: 0 auto 8px;
}

.qr-card span {
  font-size: 0.82rem;
  font-weight: 600;
}

@media (max-width: 860px) {
  .nav {
    display: none;
  }
  .hero-top,
  .block-header,
  .feature-list,
  .spec-grid,
  .sim-split {
    grid-template-columns: 1fr;
  }
  .sim-sidebar {
    border-right: none;
    border-bottom: 1px solid var(--line);
  }
}