/* RecAi / RecDown 官网 —— 共享样式
   苹方/系统字体栈，浅色/深色自适应，移动端优先 */

:root {
  color-scheme: light dark;

  --bg: #ffffff;
  --bg-elevated: #f5f5f7;
  --bg-muted: #fbfbfd;
  --text: #1d1d1f;
  --text-secondary: #6e6e73;
  --border: rgba(0, 0, 0, 0.08);
  --accent: #0a84ff;
  --accent-text: #ffffff;
  --card-bg: #ffffff;
  --card-shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 8px 24px rgba(0, 0, 0, 0.06);
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --max-width: 1120px;
  --recdown-accent: #ff9f0a;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --bg-elevated: #1c1c1e;
    --bg-muted: #111113;
    --text: #f5f5f7;
    --text-secondary: #a1a1a6;
    --border: rgba(255, 255, 255, 0.1);
    --accent: #2f96ff;
    --accent-text: #ffffff;
    --card-bg: #1c1c1e;
    --card-shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.45);
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Helvetica Neue", "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

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

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(20px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--border);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 16px;
}

.brand img {
  width: 24px;
  height: 24px;
  border-radius: 6px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14px;
  color: var(--text-secondary);
}

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

.lang-switch {
  font-size: 13px;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 12px;
}

.lang-switch:hover {
  color: var(--text);
  border-color: var(--text-secondary);
}

/* ---------- Hero ---------- */

.hero {
  padding: 72px 0 48px;
  text-align: center;
}

.hero-icon {
  width: 96px;
  height: 96px;
  border-radius: 22px;
  margin: 0 auto 24px;
  box-shadow: var(--card-shadow);
}

/* macOS 图标自带留白和阴影，不再加圆角和投影 */
.hero-icon.mac-icon {
  width: 128px;
  height: 128px;
  border-radius: 0;
  box-shadow: none;
}

.hero h1 {
  font-size: clamp(32px, 6vw, 52px);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
}

.hero p.subtitle {
  font-size: clamp(16px, 2.4vw, 20px);
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 32px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  margin-bottom: 20px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.15s ease;
}

.btn:hover {
  opacity: 0.85;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--text);
  color: var(--bg);
}

.btn-store {
  background: #000;
  color: #fff;
  flex-direction: row;
}

@media (prefers-color-scheme: dark) {
  .btn-store {
    background: #fff;
    color: #000;
  }
}

.btn-store .store-icon {
  width: 18px;
  height: 18px;
  flex: none;
}

.btn-store .store-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.1;
}

.btn-store .store-text small {
  font-size: 10px;
  font-weight: 400;
  opacity: 0.8;
}

.btn-store .store-text strong {
  font-size: 16px;
}

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text);
}

.btn-accent {
  background: var(--accent);
  color: var(--accent-text);
}

.hero-meta {
  font-size: 13px;
  color: var(--text-secondary);
}

/* ---------- Screenshot showcase ---------- */

.showcase {
  padding: 32px 0 64px;
}

.showcase-scroll {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  padding: 8px 4px 24px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.showcase-scroll::-webkit-scrollbar {
  height: 6px;
}

.showcase-scroll::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 999px;
}

.shot-card {
  flex: none;
  width: 220px;
  scroll-snap-align: start;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  background: var(--card-bg);
}

.shot-card img {
  width: 100%;
  height: auto;
}

.mac-shot {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  margin-top: 8px;
}

.mac-shot img {
  width: 100%;
  height: auto;
}

/* ---------- Section ---------- */

.section {
  padding: 56px 0;
}

.section-title {
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 700;
  letter-spacing: -0.01em;
  text-align: center;
  margin: 0 0 12px;
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 40px;
  font-size: 16px;
}

/* ---------- Feature grid ---------- */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  padding: 26px 24px;
}

.feature-card .icon {
  font-size: 28px;
  margin-bottom: 14px;
  display: block;
}

.feature-card h3 {
  font-size: 17px;
  margin: 0 0 8px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 0;
}

/* ---------- Trust / privacy strip ---------- */

.trust-strip {
  background: var(--bg-muted);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

/* ---------- FAQ ---------- */

.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
}

.faq-item summary {
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  font-weight: 400;
  color: var(--text-secondary);
  margin-left: 12px;
  flex: none;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item p {
  margin: 12px 0 0;
  color: var(--text-secondary);
  font-size: 15px;
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 0 32px;
  font-size: 13px;
  color: var(--text-secondary);
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

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

.footer-other-product {
  opacity: 0.7;
  font-size: 12px;
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
}

/* ---------- RecDown-specific accents ---------- */

.recdown-page .btn-accent {
  background: var(--recdown-accent);
  color: #1d1d1f;
}

.recdown-version {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 8px;
}

.quality-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-top: 24px;
}

.quality-chip {
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  padding: 14px;
  text-align: center;
  font-size: 13px;
}

.quality-chip strong {
  display: block;
  font-size: 14px;
  margin-bottom: 4px;
}

.site-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 24px;
}

.site-chip {
  background: var(--bg-elevated);
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 13px;
  color: var(--text-secondary);
}

/* ---------- Content pages (support / privacy) ---------- */

.content-page {
  padding: 48px 0 80px;
}

.content-page h1 {
  font-size: clamp(28px, 5vw, 40px);
  margin: 0 0 8px;
}

.content-page .updated {
  color: var(--text-secondary);
  font-size: 13px;
  margin-bottom: 40px;
}

.content-page h2 {
  font-size: 20px;
  margin: 40px 0 12px;
}

.content-page p,
.content-page li {
  color: var(--text-secondary);
  font-size: 15px;
}

.content-page ul {
  padding-left: 20px;
}

.content-page .placeholder {
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
  color: var(--accent);
}

.contact-card {
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  padding: 28px;
  margin: 24px 0;
}

.contact-card a {
  color: var(--accent);
  font-weight: 600;
}

@media (max-width: 640px) {
  .nav-links {
    gap: 16px;
  }
  .nav-links .nav-label {
    display: none;
  }
}