/* ============================================================
   KOTOBA·AI 网站 — 主样式
   视觉：Speak 骨架 + 红白品牌色（黏土基因，仅浅色 D-2026-09-04-05）
   颜色/圆角/阴影令牌对照 ../Kotoba·AI/docs/design-spec.md
   注意：未用 Google Fonts（大陆被墙），标题字体自托管 static/fonts/
   ============================================================ */

/* ---------- 自托管字体（仅拉丁字符可变字体，中文回落雅黑/苹方） ---------- */
@font-face {
  font-family: "Nunito";
  font-style: normal;
  font-weight: 800 900;
  font-display: swap;
  src: url("../static/fonts/nunito-latin.woff2") format("woff2");
}
@font-face {
  font-family: "DM Sans";
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url("../static/fonts/dm-sans-latin.woff2") format("woff2");
}

/* ---------- 令牌 ---------- */
:root {
  color-scheme: light;

  --color-primary: #F00000;
  --color-primary-dark: #C80000;
  --color-primary-light: #FFEBEB;
  --color-primary-surface: #FFF5F5;

  --color-success: #1FA65B;
  --color-info: #2E6FD8;
  --color-warning: #E09A00;

  --text-primary: #332F3A;
  --text-secondary: #635F69;
  --text-tertiary: #9A93A1;
  --text-white: #FFFFFF;

  --bg-page: #FAF8F6;
  --bg-card: rgba(255, 255, 255, 0.72);
  --bg-card-solid: #FFFFFF;
  --border-light: #EDE8E3;
  --border-card: rgba(192, 57, 43, 0.08);

  --radius-sm: 20px;
  --radius-md: 24px;
  --radius-lg: 32px;
  --radius-xl: 48px;

  /* 四层黏土阴影栈（对照 design-spec 六） */
  --shadow-card:
    0 1px 2px rgba(192, 57, 43, 0.05), 0 4px 8px rgba(192, 57, 43, 0.06),
    0 12px 24px rgba(192, 57, 43, 0.08), 0 24px 48px rgba(192, 57, 43, 0.10);
  --shadow-button:
    0 2px 4px rgba(192, 57, 43, 0.12), 0 8px 16px rgba(192, 57, 43, 0.14),
    inset 0 -2px 4px rgba(0, 0, 0, 0.06), inset 0 1px 1px rgba(255, 255, 255, 0.5);
  --shadow-deep:
    0 4px 8px rgba(192, 57, 43, 0.08), 0 16px 32px rgba(192, 57, 43, 0.10),
    0 40px 80px rgba(192, 57, 43, 0.12), inset 0 -6px 12px rgba(0, 0, 0, 0.04);
  --shadow-pressed:
    0 1px 2px rgba(192, 57, 43, 0.08), 0 2px 4px rgba(192, 57, 43, 0.10),
    inset 0 4px 8px rgba(0, 0, 0, 0.12), inset 0 2px 4px rgba(0, 0, 0, 0.08);

  --font-display: "Nunito", "Microsoft YaHei", "PingFang SC", sans-serif;
  --font-body: "DM Sans", "Microsoft YaHei", "PingFang SC", sans-serif;

  --container: 1160px;
  --space-sm: 12px;
  --space-md: 20px;
  --space-lg: 32px;
  --space-xl: 48px;
  --space-2xl: 64px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-page);
  position: relative;
}

/* 漂浮红光斑（对照 design-spec 七；fixed 伪元素，不挡交互） */
body::before,
body::after {
  content: "";
  position: fixed;
  z-index: -1;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(90px);
}
body::before {
  width: 520px;
  height: 520px;
  top: -160px;
  right: -140px;
  background: rgba(240, 0, 0, 0.06);
}
body::after {
  width: 420px;
  height: 420px;
  bottom: -140px;
  left: -120px;
  background: rgba(240, 0, 0, 0.045);
}

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

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.container--narrow { max-width: 780px; }

.section { padding: var(--space-2xl) 0; }

.section__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 4vw, 40px);
  letter-spacing: -0.5px;
  text-align: center;
  margin-bottom: 12px;
}

.section__subtitle {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

a { color: inherit; text-decoration: none; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  cursor: pointer;
  border: none;
  transition: transform 0.15s ease-out, box-shadow 0.2s ease-out;
}
.btn--primary {
  background: linear-gradient(180deg, #FF3B30 0%, var(--color-primary) 60%, #D90000 100%);
  color: #fff;
  box-shadow: var(--shadow-button);
}
.btn--primary:hover { transform: translateY(-3px); box-shadow: var(--shadow-deep); }
.btn--primary:active { transform: scale(0.94); box-shadow: var(--shadow-pressed); }
.btn--ghost {
  background: var(--bg-card-solid);
  color: var(--text-primary);
  border: 1.5px solid var(--border-light);
}
.btn--ghost:hover {
  transform: translateY(-3px);
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: var(--color-primary-surface);
  box-shadow: var(--shadow-deep);
}
.btn--ghost:active { transform: scale(0.94); }
.btn--ms { background: #0078D4; color: #fff; box-shadow: 0 4px 14px rgba(0, 120, 212, 0.3); }
.btn--ms:hover { background: #106EBE; transform: translateY(-3px); box-shadow: 0 12px 28px rgba(0, 120, 212, 0.38); }
.btn--ms:active { transform: scale(0.94); }
.btn--lg { padding: 16px 40px; font-size: 18px; border-radius: var(--radius-lg); }
.btn--sm { padding: 8px 20px; font-size: 14px; }

/* ---------- 导航 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background 0.2s ease-out, border-color 0.2s ease-out, backdrop-filter 0.2s ease-out;
}
/* 滚动后出现毛玻璃（js/main.js 加 nav--scrolled） */
.nav.nav--scrolled {
  background: rgba(250, 248, 246, 0.78);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border-bottom-color: var(--border-light);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 16px;
}
.nav__logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: 0.5px;
}
.nav__logo-dot { color: var(--color-primary); }
.nav__logo-img { width: 28px; height: 28px; }
.nav__join { display: flex; align-items: center; }
.nav__join img { height: 22px; display: block; }
.nav__links { display: flex; gap: 28px; }
.nav__links a { font-weight: 600; color: var(--text-secondary); }
.nav__links a:hover { color: var(--color-primary); }
.nav__actions { display: flex; align-items: center; gap: 12px; }
.nav__burger { display: none; background: none; border: none; font-size: 22px; cursor: pointer; color: var(--text-primary); }

/* ---------- Hero ---------- */
.hero { padding: calc(var(--space-2xl) + 16px) 0 var(--space-2xl); }
.hero__inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-xl);
  align-items: center;
}
.hero__badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 999px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 20px;
}
.hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 6.5vw, 68px);
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 20px;
}
.hero__title-accent { color: var(--color-primary); }
.hero__subtitle {
  color: var(--text-secondary);
  font-size: 18px;
  max-width: 480px;
  margin-bottom: var(--space-lg);
}
.hero__cta { display: flex; gap: 16px; flex-wrap: wrap; }

/* 功能截图：按原图比例展示，不裁切 */
.feature-shot {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

/* ---------- 数据条 ---------- */
.stats { border-block: 1px solid var(--border-light); padding: var(--space-lg) 0; }
.stats__inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stat__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 36px;
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
  color: var(--color-primary);
}
.stat__label { color: var(--text-secondary); font-size: 14px; }

/* ---------- 功能亮点 ---------- */
.feature-card {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-xl);
  align-items: center;
  padding: var(--space-xl) 0;
}
.feature-card--reverse .feature-card__text { order: 2; }
.feature-card--reverse .feature-card__visual { order: 1; }
.feature-card__text h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 26px;
  margin-bottom: 12px;
}
.feature-card__text p { color: var(--text-secondary); }

/* ---------- FAQ ---------- */
.faq__list { display: flex; flex-direction: column; gap: 12px; margin-top: var(--space-lg); }
.faq__item {
  width: 100%;
  background: var(--bg-card-solid);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 16px 24px;
  transition: border-color 0.15s ease-out, box-shadow 0.2s ease-out;
}
.faq__item:hover { border-color: var(--color-primary); box-shadow: var(--shadow-card); }
.faq__item summary {
  font-family: var(--font-display);
  font-weight: 800;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__icon { color: var(--color-primary); font-size: 20px; transition: transform 0.2s; }
.faq__item[open] .faq__icon { transform: rotate(45deg); }
.faq__item p { color: var(--text-secondary); margin-top: 12px; }

/* ---------- 招募 ---------- */
.join__panel {
  background: var(--bg-card-solid);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl) var(--space-xl);
  text-align: center;
  box-shadow: var(--shadow-card);
}
.join__logo { height: 52px; margin-bottom: 16px; }
.join__desc { max-width: 620px; margin: 0 auto var(--space-lg); color: var(--text-secondary); }
.join__actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ---------- 大 CTA ---------- */
.cta__inner { text-align: center; }
.cta__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 4.5vw, 44px);
  letter-spacing: -0.5px;
  margin-bottom: var(--space-lg);
}
.cta__meta { margin-top: 12px; color: var(--text-tertiary); font-size: 14px; }

/* ---------- 下载页 ---------- */
.dl-hero__meta { text-align: center; color: var(--text-secondary); margin-bottom: var(--space-lg); }
.dl-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}
.dl-card {
  background: var(--bg-card-solid);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-align: center;
  box-shadow: var(--shadow-card);
  transition: transform 0.2s ease-out, box-shadow 0.2s ease-out;
}
.dl-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-deep); }
.dl-card__title {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  margin-bottom: 8px;
}
.dl-card__desc { color: var(--text-secondary); font-size: 14px; margin-bottom: 20px; }
.dl-btn { display: block; }
.dl-hero__fallback { text-align: center; color: var(--text-tertiary); font-size: 14px; }
.dl-hero__fallback a { color: var(--color-info, #2E6FD8); }
.dl-req__list { list-style: none; margin-top: var(--space-lg); }
.dl-req__list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-secondary);
}
.changelog__item {
  background: var(--bg-card-solid);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin-top: var(--space-lg);
}
.changelog__ver { font-family: var(--font-display); font-weight: 800; }
.changelog__date { color: var(--text-tertiary); font-size: 14px; font-weight: 400; margin-left: 8px; }
.changelog__item ul { margin: 12px 0 0 20px; color: var(--text-secondary); }

/* ---------- 辅助亮点小卡行（首页功能区尾部） ---------- */
.minifeats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}
.minifeat {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}
.minifeat h4 { font-family: var(--font-display); font-weight: 800; font-size: 16px; margin-bottom: 6px; }
.minifeat p { color: var(--text-secondary); font-size: 14px; }

/* ---------- 一起做（首页面板） ---------- */
.join__slogan {
  font-size: clamp(16px, 2vw, 20px);
  font-weight: 700;
  margin-bottom: 12px;
  opacity: 0.95;
}
.join__roles {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  max-width: 640px;
  margin: 0 auto var(--space-lg);
}
.join-role {
  background: var(--bg-page);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  text-align: left;
  transition: background 0.2s, transform 0.15s;
}
.join-role:hover { border-color: var(--color-primary); transform: translateY(-2px); }
.join-role h4 { font-family: var(--font-display); font-weight: 900; font-size: 18px; margin-bottom: 4px; }
.join-role p { font-size: 14px; color: var(--text-secondary); }

/* ---------- QQ 群复制卡（join 页「如何加入」主卡） ---------- */
.qq-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  background: var(--bg-card-solid);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-2xl);
  text-align: center;
  box-shadow: var(--shadow-card);
}
.qq-card__label {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--color-primary);
  background: var(--color-primary-light);
  border-radius: 999px;
  padding: 4px 18px;
  margin-bottom: 10px;
}
.qq-card__group strong {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 5vw, 44px);
  line-height: 1.2;
  letter-spacing: 1px;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
  margin-bottom: 14px;
}
.qq-card .btn { margin-bottom: 14px; }
.qq-card__hint { font-size: 13px; color: var(--text-tertiary); }

/* ---------- 一起做（独立页） ---------- */
.join-hero { text-align: center; padding-top: var(--space-2xl); }
.join-hero__logo { height: 72px; max-width: 80%; margin-bottom: 20px; }
.join-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 6vw, 60px);
  letter-spacing: -1px;
  margin-bottom: 12px;
}
.join-hero__slogan { font-size: clamp(17px, 2.4vw, 22px); font-weight: 700; color: var(--color-primary); margin-bottom: 20px; }
.join-hero__desc { color: var(--text-secondary); max-width: 620px; margin: 0 auto; }
.join-hero__desc strong { font-size: 1.3em; font-weight: 800; color: var(--text-primary); }

.way-card {
  background: var(--bg-card-solid);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-top: var(--space-lg);
  box-shadow: var(--shadow-card);
}
.way-card__head { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; margin-bottom: var(--space-lg); }
.way-card__head h3 { font-family: var(--font-display); font-weight: 900; font-size: 24px; color: var(--color-primary); }
.way-card__tag {
  font-size: 13px;
  color: var(--text-secondary);
  background: var(--color-primary-surface);
  border-radius: 999px;
  padding: 4px 14px;
}
.way-card__body { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-lg); }
.way-card__col h5 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 15px;
  color: var(--text-tertiary);
  margin-bottom: 10px;
}
.way-card__col ul { list-style: none; }
.way-card__col li {
  padding: 8px 0;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-secondary);
  font-size: 15px;
}
.way-card__col li:last-child { border-bottom: none; }
.way-card__col li strong { color: var(--text-primary); }

.honest-card {
  background: var(--color-primary-surface);
  border: 1px solid var(--color-primary-light);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}
.honest-card h3 { font-family: var(--font-display); font-weight: 800; margin-bottom: 12px; }
.honest-card p { color: var(--text-secondary); margin-bottom: 8px; }

.join-how { text-align: center; }

/* 开发者角色卡网格 */
.dev-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}
.dev-card {
  background: var(--bg-card-solid);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-card);
  transition: transform 0.2s ease-out, box-shadow 0.2s ease-out;
}
.dev-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-deep); }
.dev-card h4 { font-family: var(--font-display); font-weight: 800; font-size: 17px; margin-bottom: 10px; }
.dev-card__do { color: var(--text-secondary); font-size: 14px; margin-bottom: 10px; }
.dev-card__skill { color: var(--text-secondary); font-size: 13px; margin-bottom: 6px; }
.dev-card__major {
  display: inline-block;
  font-size: 12px;
  color: var(--color-primary);
  background: var(--color-primary-light);
  border-radius: 999px;
  padding: 3px 12px;
}
.dev-note { text-align: center; color: var(--text-secondary); margin-top: var(--space-lg); }

/* 如何加入卡片组 */
.join-cards {
  display: flex;
  justify-content: center;
  align-items: stretch;
  gap: var(--space-lg);
  flex-wrap: wrap;
}
.join-gh {
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: var(--bg-card-solid);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 20px 28px;
  text-align: left;
}
.join-gh h4 { font-family: var(--font-display); font-weight: 800; font-size: 17px; margin-bottom: 4px; }
.join-gh p { color: var(--text-secondary); font-size: 14px; }
.join-gh:hover { box-shadow: var(--shadow-card); }

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--border-light);
  padding: var(--space-xl) 0 var(--space-lg);
  margin-top: var(--space-xl);
}
.footer__inner {
  display: grid;
  gap: var(--space-lg);
  text-align: center;
}
.footer__brand p { color: var(--text-tertiary); font-size: 14px; margin-top: 4px; }
.footer__logo { height: 96px; }

/* 社媒三色按钮（色值与交互引主项目 guide-btn，形状遵循本站胶囊体系） */
.footer__social { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 20px; }
.social-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 800;
  font-family: var(--font-display);
  color: #fff;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.15s ease-out;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.18);
}
.social-btn:hover { transform: translateY(-3px); filter: brightness(1.1); box-shadow: 0 8px 22px rgba(0, 0, 0, 0.24); }
.social-btn:active { transform: scale(0.96); }
.social-btn--github { background: #171515; }
.social-btn--bili { background: linear-gradient(135deg, #FB7299, #FC6486); }
.social-btn--qq { background: linear-gradient(135deg, #12B7F5, #3D8BFD); }
/* 深色主题已取消（D-2026-09-04-05），仅保留浅色 */
.footer__links { display: flex; gap: 24px; justify-content: center; flex-wrap: wrap; }
.footer__links a { color: var(--text-secondary); font-size: 14px; }
.footer__links a:hover { color: var(--color-primary); }
.footer__legal { display: flex; gap: 16px; justify-content: center; color: var(--text-tertiary); font-size: 13px; }
.footer__legal a { color: var(--text-tertiary); text-decoration: underline; }
.footer__copy { color: var(--text-tertiary); font-size: 13px; }

/* ---------- 滚动淡入动效（reveal 类由 js/main.js 统一挂载/触发） ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: none; }
/* 同组元素错峰入场（js 按组内序号轮转挂 d1~d3） */
.reveal-d1 { transition-delay: 0.07s; }
.reveal-d2 { transition-delay: 0.14s; }
.reveal-d3 { transition-delay: 0.21s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .reveal-d1, .reveal-d2, .reveal-d3 { transition-delay: 0s; }
  html { scroll-behavior: auto; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .section { padding: var(--space-xl) 0; }
  .hero { padding: var(--space-xl) 0; }
  .hero__inner { grid-template-columns: 1fr; gap: var(--space-lg); }
  .hero__subtitle { max-width: none; }
  .feature-card { grid-template-columns: 1fr; gap: var(--space-lg); padding: var(--space-lg) 0; }
  .feature-card--reverse .feature-card__text { order: 1; }
  .feature-card--reverse .feature-card__visual { order: 2; }
  .stats { padding: var(--space-md) 0; }
  .stats__inner { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .dl-cards { grid-template-columns: 1fr; }
  .minifeats { grid-template-columns: repeat(2, 1fr); margin-top: var(--space-lg); }
  .join__panel { padding: var(--space-xl) var(--space-lg); }
  .join__roles { grid-template-columns: 1fr; }
  .way-card__body { grid-template-columns: 1fr; }
  .dev-grid { grid-template-columns: repeat(2, 1fr); }
  .footer { padding: var(--space-lg) 0; margin-top: var(--space-lg); }
  .footer__logo { height: 72px; }
  .nav__links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-page);
    flex-direction: column;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-light);
  }
  .nav__links.open { display: flex; }
  .nav__burger { display: block; }
}

@media (max-width: 600px) {
  .hero { padding: var(--space-lg) 0 var(--space-xl); }
  .hero__cta .btn { width: 100%; text-align: center; }
  .join__panel { padding: var(--space-lg) var(--space-md); border-radius: var(--radius-lg); }
  .join__logo { height: 44px; }
  .join-hero__logo { height: 56px; }
  .faq__item { padding: 14px 18px; }
  .minifeats { grid-template-columns: 1fr; }
  .dev-grid { grid-template-columns: 1fr; }
  .qq-card { padding: var(--space-lg) var(--space-md); }
  .join-cards { gap: var(--space-md); }
}