/* SocioBird shared styles — used by /usages/* content pages.
   Design tokens mirror index.html so these pages feel native to the site. */
:root {
  --bg: #ffffff;
  --bg-soft: #f7f6fd;
  --bg-soft-2: #f1effb;
  --surface: #ffffff;
  --border: #e7e4f6;
  --border-strong: #d9d4ef;
  --text: #150f2e;
  --text-muted: #5c5674;
  --text-faint: #8b86a3;

  --primary: #6d28d9;
  --primary-dark: #4c1d95;
  --accent: #4f46e5;
  --accent-soft: #eeecfd;
  --success: #16a34a;
  --success-soft: #e9f9ee;

  --gradient: linear-gradient(135deg, #6d28d9 0%, #4f46e5 55%, #4338ca 100%);
  --gradient-soft: linear-gradient(135deg, #f1effb 0%, #eef0fd 100%);
  --gradient-text: linear-gradient(90deg, #6d28d9, #4f46e5);

  --radius-lg: 24px;
  --radius-md: 16px;
  --shadow-sm: 0 1px 2px rgba(21, 15, 46, 0.06);
  --shadow-md: 0 12px 24px -12px rgba(76, 29, 149, 0.18);
  --shadow-lg: 0 24px 48px -18px rgba(76, 29, 149, 0.28);

  --nav-bg: rgba(255, 255, 255, 0.85);
  --hero-glow: rgba(109, 40, 217, 0.14);

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #0c0a17; --bg-soft: #131120; --bg-soft-2: #1a1729;
    --surface: #15121f; --border: #29253f; --border-strong: #39335a;
    --text: #f4f2fb; --text-muted: #b3adc9; --text-faint: #7c7696;
    --primary: #a789f7; --accent: #818cf8; --accent-soft: #241f3d;
    --success: #4ade80; --success-soft: #16301f;
    --gradient: linear-gradient(135deg, #7c3aed 0%, #6366f1 55%, #4f46e5 100%);
    --gradient-soft: linear-gradient(135deg, #241f3d 0%, #221f3a 100%);
    --gradient-text: linear-gradient(90deg, #b294fb, #8b93fa);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3); --shadow-md: 0 12px 24px -12px rgba(0,0,0,0.55); --shadow-lg: 0 24px 48px -18px rgba(0,0,0,0.65);
    --nav-bg: rgba(12,10,23,0.8); --hero-glow: rgba(129,140,248,0.16);
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0c0a17; --bg-soft: #131120; --bg-soft-2: #1a1729;
  --surface: #15121f; --border: #29253f; --border-strong: #39335a;
  --text: #f4f2fb; --text-muted: #b3adc9; --text-faint: #7c7696;
  --primary: #a789f7; --accent: #818cf8; --accent-soft: #241f3d;
  --success: #4ade80; --success-soft: #16301f;
  --gradient: linear-gradient(135deg, #7c3aed 0%, #6366f1 55%, #4f46e5 100%);
  --gradient-soft: linear-gradient(135deg, #241f3d 0%, #221f3a 100%);
  --gradient-text: linear-gradient(90deg, #b294fb, #8b93fa);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3); --shadow-md: 0 12px 24px -12px rgba(0,0,0,0.55); --shadow-lg: 0 24px 48px -18px rgba(0,0,0,0.65);
  --nav-bg: rgba(12,10,23,0.8); --hero-glow: rgba(129,140,248,0.16);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; font-family: var(--font); color: var(--text); background: var(--bg); -webkit-font-smoothing: antialiased; line-height: 1.55; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, h4, p { margin: 0; }
button { font-family: inherit; cursor: pointer; }
.wrap { width: 100%; max-width: 1180px; margin: 0 auto; padding: 0 24px; }

.eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; letter-spacing: 0.02em; color: var(--primary); background: var(--accent-soft); border: 1px solid var(--border-strong); padding: 6px 14px; border-radius: 999px; }
.grad-text { background: var(--gradient-text); -webkit-background-clip: text; background-clip: text; color: transparent; }

section { padding-block: 88px; }
section.tight { padding-block: 56px; }
section.soft { background: var(--bg-soft); }
.section-head { max-width: 640px; margin: 0 0 44px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head h2 { font-size: clamp(28px, 3.6vw, 40px); font-weight: 700; letter-spacing: -0.02em; line-height: 1.15; text-wrap: balance; }
.section-head p { margin-top: 14px; font-size: 17px; color: var(--text-muted); }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 13px 24px; border-radius: 999px; font-weight: 600; font-size: 15px; border: 1px solid transparent; transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, border-color 0.15s ease; white-space: nowrap; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--gradient); color: #fff; box-shadow: var(--shadow-md); }
.btn-primary:hover { box-shadow: var(--shadow-lg); transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border-strong); }
.btn-ghost:hover { background: var(--bg-soft); border-color: var(--primary); }
.btn-dark { background: var(--text); color: var(--bg); }
.btn-dark:hover { background: var(--primary-dark); color: #fff; }
.btn-lg { padding: 16px 32px; font-size: 16px; }
.btn-block { width: 100%; }

/* ---------- nav ---------- */
.nav { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 100; background: var(--nav-bg); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 76px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 19px; letter-spacing: -0.01em; }
.brand-mark { width: 34px; height: 34px; border-radius: 10px; overflow: hidden; flex-shrink: 0; }
.brand-mark img { width: 100%; height: 100%; object-fit: contain; }
.brand .word b { color: var(--primary); font-weight: 800; }
.brand .word i { color: var(--accent); font-weight: 800; font-style: normal; }
.brand small { display: block; font-size: 10px; font-weight: 600; color: var(--text-faint); letter-spacing: 0.04em; margin-top: -2px; }
.nav-links { display: flex; align-items: center; gap: 26px; }
.nav-links a { font-size: 14px; font-weight: 600; color: var(--text-muted); }
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-cta { display: flex; align-items: center; gap: 10px; }
.theme-toggle { width: 40px; height: 40px; border-radius: 10px; border: 1px solid var(--border-strong); background: var(--surface); color: var(--text); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.theme-toggle:hover { background: var(--bg-soft); border-color: var(--primary); }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme='dark'] .theme-toggle .icon-sun { display: block; }
[data-theme='dark'] .theme-toggle .icon-moon { display: none; }
.nav-toggle { display: none; background: none; border: 1px solid var(--border-strong); border-radius: 10px; width: 40px; height: 40px; align-items: center; justify-content: center; }
.nav-toggle svg { width: 20px; height: 20px; }
.mobile-panel { display: none; border-top: 1px solid var(--border); padding: 16px 0 24px; }
.mobile-panel.open { display: block; }
.mobile-panel a { display: block; padding: 12px 0; font-weight: 600; color: var(--text); border-bottom: 1px solid var(--border); }
.mobile-panel .nav-cta { flex-direction: column; align-items: stretch; margin-top: 16px; }
.mobile-theme-row { display: flex; align-items: center; justify-content: space-between; padding: 14px 0; font-weight: 600; font-size: 14.5px; }

/* ---------- breadcrumb ---------- */
.crumb { padding: 22px 0 0; font-size: 13.5px; color: var(--text-faint); }
.crumb a { color: var(--text-muted); font-weight: 600; }
.crumb a:hover { color: var(--primary); }

/* ---------- content hero ---------- */
.page-hero { padding: 40px 0 8px; position: relative; overflow: hidden; }
.page-hero::before { content: ''; position: absolute; inset: -30% -10% auto -10%; height: 460px; background: radial-gradient(60% 60% at 50% 0%, var(--hero-glow), transparent 70%); pointer-events: none; z-index: -1; }
.page-hero-inner { max-width: 760px; }
.page-hero h1 { font-size: clamp(28px, 4.4vw, 44px); font-weight: 800; letter-spacing: -0.03em; line-height: 1.15; margin-top: 18px; text-wrap: balance; }
.page-hero .lead { margin-top: 18px; font-size: 17px; color: var(--text-muted); max-width: 640px; }
.page-hero .hero-cta { display: flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; }
.page-hero .hero-note { margin-top: 14px; font-size: 13.5px; color: var(--text-faint); }

/* ---------- grids / cards ---------- */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.feature-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 28px; transition: box-shadow 0.2s ease, transform 0.2s ease, border-color 0.2s ease; }
.feature-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: var(--border-strong); }
.feature-icon { width: 46px; height: 46px; border-radius: 12px; background: var(--gradient-soft); color: var(--primary); display: flex; align-items: center; justify-content: center; margin-bottom: 18px; }
.feature-icon svg { width: 22px; height: 22px; stroke: currentColor; fill: none; }
.feature-card h3 { font-size: 18px; font-weight: 700; letter-spacing: -0.01em; }
.feature-card p { margin-top: 8px; font-size: 14.5px; color: var(--text-muted); }

/* ---------- prose / article body ---------- */
.prose { max-width: 760px; }
.prose h2 { font-size: clamp(24px, 3vw, 30px); font-weight: 700; letter-spacing: -0.02em; margin-top: 0; }
.prose h3 { font-size: 19px; font-weight: 700; letter-spacing: -0.01em; margin-top: 28px; }
.prose p { font-size: 16px; color: var(--text-muted); line-height: 1.7; margin-top: 14px; }
.prose ul.check { margin-top: 18px; display: flex; flex-direction: column; gap: 12px; }
.prose ul.check li { display: flex; align-items: flex-start; gap: 10px; font-size: 15.5px; color: var(--text); line-height: 1.5; }
.prose ul.check li svg { width: 18px; height: 18px; color: var(--success); flex-shrink: 0; margin-top: 3px; }
.prose ol { margin-top: 18px; padding-left: 22px; display: flex; flex-direction: column; gap: 10px; }
.prose ol li { font-size: 15.5px; color: var(--text); line-height: 1.6; padding-left: 4px; }
.stat-strip { display: flex; flex-wrap: wrap; gap: 28px; margin-top: 8px; }
.stat-strip .stat b { display: block; font-size: 26px; font-weight: 800; color: var(--primary); }
.stat-strip .stat span { font-size: 13px; color: var(--text-faint); }

/* ---------- platform chips ---------- */
.platform-row { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.platform-chip { display: flex; align-items: center; gap: 9px; padding: 9px 16px 9px 12px; border-radius: 999px; background: var(--surface); border: 1px solid var(--border); font-size: 13.5px; font-weight: 600; transition: border-color 0.15s ease, transform 0.15s ease; }
.platform-chip:hover { border-color: var(--primary); transform: translateY(-2px); }
.icon-badge { width: 20px; height: 20px; flex-shrink: 0; }
.icon-badge img { width: 100%; height: 100%; object-fit: contain; }
[data-theme='dark'] .icon-badge img { filter: invert(1); }
@media (prefers-color-scheme: dark) { :root:not([data-theme='light']) .icon-badge img { filter: invert(1); } }

/* ---------- FAQ ---------- */
.faq-item { border: 1px solid var(--border); border-radius: var(--radius-md); background: var(--surface); overflow: hidden; }
.faq-item + .faq-item { margin-top: 12px; }
.faq-q { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 20px 22px; background: none; border: none; text-align: left; font-size: 16px; font-weight: 600; color: var(--text); }
.faq-q svg { width: 20px; height: 20px; color: var(--text-faint); flex-shrink: 0; transition: transform 0.2s ease; }
.faq-item.open .faq-q svg { transform: rotate(45deg); color: var(--primary); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.25s ease; }
.faq-a-inner { padding: 0 22px 20px; font-size: 14.5px; color: var(--text-muted); line-height: 1.6; }
.faq-a-inner a { color: var(--primary); text-decoration: underline; }

/* ---------- related links ---------- */
.related-card { display: block; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md); padding: 18px 20px; transition: border-color .15s ease, transform .15s ease; }
.related-card:hover { border-color: var(--primary); transform: translateY(-2px); }
.related-card .tag { display: block; font-family: var(--font-mono); font-size: 10.5px; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 6px; }
.related-card h4 { font-size: 15px; font-weight: 700; }

/* ---------- CTA banner ---------- */
.cta-banner { background: var(--gradient); border-radius: var(--radius-lg); padding: 56px 48px; text-align: center; color: #fff; position: relative; overflow: hidden; }
.cta-banner h2 { font-size: clamp(26px, 3.2vw, 34px); font-weight: 800; letter-spacing: -0.02em; }
.cta-banner p { margin-top: 12px; color: rgba(255,255,255,0.85); font-size: 16px; }
.cta-banner .hero-cta { margin-top: 28px; justify-content: center; }
.cta-banner .btn-ghost { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.35); color: #fff; }
.cta-banner .btn-ghost:hover { background: rgba(255,255,255,0.18); }
.cta-banner .btn-primary { background: #fff; color: var(--primary-dark); box-shadow: none; }
.cta-banner .btn-primary:hover { background: #f4f2ff; }

/* ---------- comparison tables ---------- */
.compare-table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius-lg); background: var(--surface); }
.compare-table { width: 100%; border-collapse: collapse; min-width: 560px; font-size: 14.5px; }
.compare-table caption { text-align: left; padding: 18px 20px 0; font-size: 13px; color: var(--text-faint); }
.compare-table th, .compare-table td { padding: 14px 20px; text-align: left; border-top: 1px solid var(--border); vertical-align: top; }
.compare-table thead th { border-top: none; font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-faint); font-weight: 700; }
.compare-table tbody th { font-weight: 600; color: var(--text); white-space: nowrap; }
.compare-table .col-us { background: var(--accent-soft); }
.compare-table thead .col-us { color: var(--primary); }
.compare-table td.yes { color: var(--success); font-weight: 700; }
.compare-table td.no { color: var(--text-faint); }
.compare-table td svg { width: 16px; height: 16px; display: inline-block; vertical-align: -3px; margin-right: 6px; flex-shrink: 0; }
.compare-table-note { padding: 14px 20px 18px; font-size: 12.5px; color: var(--text-faint); border-top: 1px solid var(--border); }
.win-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 18px; }
.win-box { border: 1px solid var(--border); border-radius: var(--radius-md); padding: 22px 24px; background: var(--surface); }
.win-box.ours { border-color: var(--primary); background: var(--accent-soft); }
.win-box h4 { font-size: 14px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; color: var(--text-faint); }
.win-box.ours h4 { color: var(--primary); }
.win-box ul { margin-top: 14px; display: flex; flex-direction: column; gap: 10px; }
.win-box li { display: flex; align-items: flex-start; gap: 9px; font-size: 14.5px; color: var(--text); line-height: 1.5; }
.win-box li svg { width: 16px; height: 16px; flex-shrink: 0; margin-top: 3px; }
.win-box.ours li svg { color: var(--success); }
.win-box.theirs li svg { color: var(--text-faint); }
@media (max-width: 720px) { .win-columns { grid-template-columns: 1fr; } }

/* ---------- footer ---------- */
footer { background: #130c28; color: #c9c4dd; padding: 64px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 1.2fr repeat(3, 1fr); gap: 32px; }
.footer-brand .brand { color: #fff; }
.footer-brand p { margin-top: 14px; font-size: 14px; color: #9d96bb; max-width: 320px; line-height: 1.6; }
.footer-col h4 { font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: #fff; margin-bottom: 16px; }
.footer-col ul { display: flex; flex-direction: column; gap: 11px; }
.footer-col a { font-size: 14px; color: #b3adc9; }
.footer-col a:hover { color: #fff; }
.footer-bottom { margin-top: 56px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,0.08); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; font-size: 13px; color: #8a83a8; }
.footer-bottom-links { display: flex; gap: 16px; align-items: center; }
.footer-bottom-links a:hover { color: #fff; }

/* ---------- usages hub ---------- */
.hub-group { margin-top: 8px; }
.hub-group h3 { font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-faint); margin: 40px 0 18px; }
.hub-group h3:first-child { margin-top: 0; }
.hub-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.hub-card { display: block; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md); padding: 18px 20px; transition: border-color .15s ease, transform .15s ease, box-shadow .15s ease; }
.hub-card:hover { border-color: var(--primary); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.hub-card h4 { font-size: 15px; font-weight: 700; letter-spacing: -0.01em; }
.hub-card p { margin-top: 6px; font-size: 13.5px; color: var(--text-muted); line-height: 1.5; }

@media (max-width: 900px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr 1fr; }
  .hub-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; }
  .nav-cta .btn-ghost, .nav-cta .nav-github { display: none; }
  .nav-toggle { display: flex; }
}
@media (max-width: 620px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .hub-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}