/* TuneLab Tuner landing page
   Tokens mirror the TuneLab brand Figma file (2YMQqLbhqoGnSLUik43rCL):
   collection "Color" (Light / Dark), "Spacing", "Radius", effect styles Glass/* and Elevation/Card.
   Variable names follow the file's WEB code syntax (--tl-*). */

:root {
  /* Primitives */
  --tl-green-600: #0a9271; --tl-green-700: #00785e; --tl-green-800: #006b54;
  --tl-mint-300: #3ff5c3; --tl-mint-400: #14e3a8; --tl-mint-500: #0bc892; --tl-mint-glow: #0feaac; --tl-mint-ink: #012b22;
  --tl-ink-900: #0f1c20; --tl-slate-600: #52676d; --tl-slate-300: #9db4ae; --tl-snow-50: #f2f7f5;
  --tl-canvas-light: #f1f5f4; --tl-canvas-dark: #050c0f; --tl-white: #ffffff;

  /* Spacing */
  --tl-space-2xs: 4px; --tl-space-xs: 6px; --tl-space-sm: 8px; --tl-space-md: 12px; --tl-space-lg: 16px;
  --tl-space-xl: 20px; --tl-space-2xl: 24px; --tl-space-3xl: 32px;
  /* Radius */
  --tl-radius-xs: 8px; --tl-radius-sm: 12px; --tl-radius-md: 16px; --tl-radius-lg: 22px; --tl-radius-xl: 24px;
  --tl-radius-2xl: 28px; --tl-radius-3xl: 32px; --tl-radius-sheet: 38px; --tl-radius-full: 999px;

  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Inter", system-ui, "Segoe UI", Roboto, sans-serif;
  --max: 1200px;
}

/* Color · Light (mode 2:1) */
:root, [data-theme="light"] {
  color-scheme: light;
  --tl-bg-canvas: var(--tl-canvas-light);
  --tl-bg-card: #ffffffdb;
  --tl-bg-sheet: #f4f8f7db;
  --tl-glass-tint: #ffffff94;
  --tl-glass-tint-strong: #ffffffc7;
  --tl-glass-edge: #ffffff;
  --tl-glass-highlight: #ffffffa6;
  --tl-text-primary: var(--tl-ink-900);
  --tl-text-secondary: var(--tl-slate-600);
  --tl-text-on-accent: var(--tl-white);
  --tl-accent-default: var(--tl-green-700);
  --tl-accent-soft: #00785e1a;
  --tl-accent-line: #00785e47;
  --tl-accent-gradient-start: var(--tl-green-600);
  --tl-accent-gradient-end: var(--tl-green-800);
  --tl-border-hairline: #0f1c2012;
  --tl-border-subtle: #0f1c201f;
  --tl-fill-subtle: #0f1c200d;
  --tl-glow-ambient-1: #0feaac4d;
  --tl-glow-ambient-2: #0096b429;
  --tl-shadow-glass: #10282629;
  --tl-shadow-accent: #00785e59;
  --tl-mutation-sheet: #ede5f3;
  --tl-status-off: #e8664d;
  --hero-wash: linear-gradient(115deg, #b9f3e0 0%, #d7f6ec 30%, #f1f5f4 58%, #ede5f3 100%);
  --device-bezel: #0f1c20;
}

/* Color · Dark (mode 2:2) */
[data-theme="dark"] {
  color-scheme: dark;
  --tl-bg-canvas: var(--tl-canvas-dark);
  --tl-bg-card: #122024b8;
  --tl-bg-sheet: #0e1a1e8c;
  --tl-glass-tint: #1e30346b;
  --tl-glass-tint-strong: #22363aa8;
  --tl-glass-edge: #ffffff6b;
  --tl-glass-highlight: #ffffff24;
  --tl-text-primary: var(--tl-snow-50);
  --tl-text-secondary: var(--tl-slate-300);
  --tl-text-on-accent: var(--tl-mint-ink);
  --tl-accent-default: var(--tl-mint-400);
  --tl-accent-soft: #14e3a81f;
  --tl-accent-line: #14e3a859;
  --tl-accent-gradient-start: var(--tl-mint-300);
  --tl-accent-gradient-end: var(--tl-mint-500);
  --tl-border-hairline: #ffffff12;
  --tl-border-subtle: #ffffff2e;
  --tl-fill-subtle: #ffffff14;
  --tl-glow-ambient-1: #14e3a838;
  --tl-glow-ambient-2: #0b7d8c47;
  --tl-shadow-glass: #00000073;
  --tl-shadow-accent: #14e3a859;
  --tl-mutation-sheet: #2c2738;
  --tl-status-off: #ff8a70;
  --hero-wash: linear-gradient(115deg, #0b2a22 0%, #071a17 34%, #050c0f 64%, #050c0f 100%);
  --device-bezel: #000000;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; font-family: var(--font); color: var(--tl-text-primary); background: var(--tl-bg-canvas);
  font-size: 17px; line-height: 1.5; -webkit-font-smoothing: antialiased; overflow-x: hidden;
  transition: background-color .3s ease, color .3s ease;
  background-image: radial-gradient(900px 700px at -10% 62%, var(--tl-glow-ambient-1), transparent 70%), radial-gradient(800px 700px at 110% 82%, var(--tl-glow-ambient-2), transparent 70%);
  background-repeat: no-repeat;
}
img { max-width: 100%; display: block; }
a { color: var(--tl-accent-default); }
h1, h2, h3 { margin: 0; letter-spacing: -0.03em; line-height: 1.05; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

[data-theme="light"] .only-dark, [data-theme="dark"] .only-light { display: none !important; }

/* Ambient wash + glows (cover: mint → lavender on light, green-black + mint glow on dark) */
.ambient { position: absolute; inset: 0 0 auto 0; height: 1100px; z-index: -1; overflow: hidden; background: var(--hero-wash); pointer-events: none;
  -webkit-mask-image: linear-gradient(#000 70%, transparent); mask-image: linear-gradient(#000 70%, transparent); }
.glow { position: absolute; border-radius: 50%; filter: blur(110px); }
.g1 { width: 620px; height: 620px; left: -160px; top: -120px; background: var(--tl-glow-ambient-1); }
.g2 { width: 560px; height: 560px; right: -120px; top: 260px; background: var(--tl-glow-ambient-2); }
.g3 { width: 520px; height: 520px; right: 10%; top: -220px; background: var(--tl-mutation-sheet); opacity: .9; }
[data-theme="dark"] .g3 { background: var(--tl-glow-ambient-1); opacity: .5; }

/* Glass (Glass/Frosted CSS fallback + Elevation/Card) */
.glass, .glass-card, .chip, .btn-glass, .nav-inner, .mini-card, .theme-toggle {
  background: var(--tl-bg-card);
  border: 1px solid var(--tl-border-hairline);
  box-shadow: 0 10px 30px -8px var(--tl-shadow-glass), inset 0 1px 0 var(--tl-glass-highlight);
  -webkit-backdrop-filter: blur(22px) saturate(1.4); backdrop-filter: blur(22px) saturate(1.4);
}
.glass-card { border-radius: var(--tl-radius-2xl); padding: var(--tl-space-xl); }

/* Nav */
.nav { position: sticky; top: 0; z-index: 50; padding: 12px var(--tl-space-xl) 0; }
.nav-inner { max-width: var(--max); margin: 0 auto; display: flex; align-items: center; gap: var(--tl-space-lg);
  padding: 8px 8px 8px 12px; border-radius: var(--tl-radius-full); background: var(--tl-glass-tint-strong); }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--tl-text-primary); text-decoration: none; flex: none; }
.app-icon { width: 36px; height: 36px; border-radius: 9px; box-shadow: 0 2px 8px #0003; }
.wordmark { height: 20px; width: auto; }
.links { display: flex; gap: 4px; margin-left: auto; }
.links a { color: var(--tl-text-secondary); text-decoration: none; font-size: 15px; font-weight: 500; padding: 8px 12px; border-radius: var(--tl-radius-full); }
.links a:hover { color: var(--tl-text-primary); background: var(--tl-fill-subtle); }
.nav-actions { display: flex; align-items: center; gap: 8px; }
.theme-toggle { width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; cursor: pointer; color: var(--tl-text-primary); padding: 0; }
.theme-toggle svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
[data-theme="light"] .i-sun, [data-theme="dark"] .i-moon { display: none; }

/* Buttons (Glow/Accent Button) */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 52px; padding: 0 26px;
  border-radius: var(--tl-radius-full); font: 700 17px/1 var(--font); text-decoration: none; cursor: pointer; border: 0; color: var(--tl-text-primary);
  transition: transform .15s ease, box-shadow .2s ease; }
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0) scale(.98); }
.btn-accent { color: var(--tl-text-on-accent); background: linear-gradient(180deg, var(--tl-accent-gradient-start), var(--tl-accent-gradient-end));
  box-shadow: 0 10px 24px -6px var(--tl-shadow-accent), inset 0 1px 0 #ffffffa6; }
.btn-glass { border: 1px solid var(--tl-border-subtle); }
.btn-sm { min-height: 40px; padding: 0 18px; font-size: 15px; }
.btn-block { width: 100%; }
.btn:disabled { opacity: .6; cursor: progress; }
.btn:focus-visible, a:focus-visible, button:focus-visible, summary:focus-visible, input:focus-visible, select:focus-visible {
  outline: 3px solid var(--tl-accent-line); outline-offset: 2px; }

/* Hero */
.hero { max-width: 1360px; margin: 0 auto; padding: 56px var(--tl-space-xl) 24px;
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr); grid-template-areas: "copy devices" "cards devices"; column-gap: 32px; row-gap: 32px; align-items: start; }
.hero-copy { grid-area: copy; padding-top: 28px; }
.badge { display: inline-block; margin: 0 0 18px; padding: 4px 12px; border-radius: var(--tl-radius-full); font-size: 14px; font-weight: 600;
  color: var(--tl-accent-default); background: var(--tl-accent-soft); border: 1px solid var(--tl-accent-line); }
h1 { font-size: clamp(46px, 5.5vw, 84px); white-space: nowrap; font-weight: 800; letter-spacing: -0.045em; line-height: .98; }
.subtitle { margin: 14px 0 0; font-size: clamp(22px, 2.4vw, 30px); font-weight: 500; letter-spacing: -0.02em; color: var(--tl-text-secondary); }
.lede { margin: 20px 0 0; max-width: 34em; color: var(--tl-text-secondary); font-size: 17px; }
.lede strong { color: var(--tl-text-primary); font-weight: 600; }
.chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.chip { display: inline-flex; align-items: center; gap: 8px; padding: 9px 16px; border-radius: var(--tl-radius-full); font-size: 15px; font-weight: 500; }
.chip svg, .icon-tile svg { width: 18px; height: 18px; fill: none; stroke: var(--tl-accent-default); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex: none; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.fine { margin: 14px 0 0; font-size: 13px; color: var(--tl-text-secondary); }

.hero-cards { grid-area: cards; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.mini-card { display: flex; flex-direction: column; gap: 4px; padding: 16px; border-radius: var(--tl-radius-xl); text-decoration: none; color: var(--tl-text-primary); min-width: 0; }
.mini-card strong { font-size: 16px; margin-top: 10px; letter-spacing: -0.01em; }
.mini-card span:last-child { font-size: 13px; line-height: 1.35; color: var(--tl-text-secondary); }
.icon-tile { width: 44px; height: 44px; border-radius: var(--tl-radius-sm); display: grid; place-items: center; background: var(--tl-accent-soft); border: 1px solid var(--tl-accent-line); flex: none; }
.icon-tile svg { width: 22px; height: 22px; }

/* Devices */
.device { margin: 0; position: relative; background: var(--device-bezel); padding: 2.6%; border-radius: 15.5% / 7.2%;
  box-shadow: 0 0 0 1px #ffffff14 inset, 0 30px 60px -20px var(--tl-shadow-glass), 0 18px 36px -18px #0000004d; }
.device img { width: 100%; height: auto; border-radius: 13.2% / 6.1%; }
[data-theme="dark"] .device { box-shadow: 0 0 0 1px #ffffff26 inset, 0 0 0 1px #ffffff12, 0 30px 80px -20px #000, 0 0 70px -20px var(--tl-glow-ambient-1); }
.hero-devices { grid-area: devices; position: relative; display: grid; grid-template-columns: 1fr 1.18fr 1fr; align-items: center; gap: 0; padding: 0 0 24px; align-self: center; width: calc(100% + 40px); }
.hero-devices .device { width: 100%; }
.d-left { transform: translateX(9%) translateY(30px) scale(.95); z-index: 1; }
.d-center { z-index: 2; }
.d-right { transform: translateX(-9%) translateY(30px) scale(.95); z-index: 1; }

/* Sections */
.section { max-width: var(--max); margin: 0 auto; padding: 72px var(--tl-space-xl); }
.eyebrow { margin: 0 0 10px; font-size: 14px; font-weight: 700; letter-spacing: .02em; color: var(--tl-accent-default); }
h2 { font-size: clamp(34px, 4.6vw, 56px); font-weight: 800; }
h3 { font-size: 20px; font-weight: 700; letter-spacing: -0.015em; }
.section p { color: var(--tl-text-secondary); }
.section-lede { margin: 14px 0 0; max-width: 40em; }

.lab-grid { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, .7fr); gap: 56px; align-items: center; }
.lab-copy > p { font-size: 19px; max-width: 34em; margin: 18px 0 0; }
.mutate-card { margin-top: 28px; }
.pills { display: flex; flex-wrap: wrap; gap: 10px; }
.pill { padding: 10px 18px; border-radius: var(--tl-radius-full); font-weight: 600; font-size: 15px; color: var(--tl-accent-default);
  background: var(--tl-accent-soft); border: 1px solid var(--tl-accent-line); }
.note { margin: 14px 0 0; font-size: 15px; }
.d-solo { max-width: 320px; justify-self: center; width: 100%; }

.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-top: 32px; }
.feature { display: flex; flex-direction: column; gap: 12px; }
.feature p { margin: 0; font-size: 15px; line-height: 1.5; }

.gallery { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 28px; margin-top: 36px; }
.gallery figure { margin: 0; }
.gallery figcaption { margin-top: 14px; text-align: center; font-weight: 600; font-size: 15px; }

/* Join */
.join-card { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: 40px; padding: 40px; background: var(--tl-glass-tint-strong); }
.join-copy p { margin: 16px 0 0; }
.signup { display: flex; flex-direction: column; gap: 16px; }
.choice { border: 0; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.option { position: relative; cursor: pointer; }
.option input { position: absolute; opacity: 0; inset: 0; }
.option-body { display: flex; flex-direction: column; gap: 4px; height: 100%; padding: 16px; border-radius: var(--tl-radius-lg);
  background: var(--tl-fill-subtle); border: 1.5px solid var(--tl-border-subtle); transition: border-color .15s, background .15s; }
.option-body strong { font-size: 16px; }
.option-body small { font-size: 13px; color: var(--tl-text-secondary); line-height: 1.35; }
.option input:checked + .option-body { background: var(--tl-accent-soft); border-color: var(--tl-accent-default); }
.option input:focus-visible + .option-body { outline: 3px solid var(--tl-accent-line); outline-offset: 2px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.field { display: flex; flex-direction: column; gap: 6px; font-size: 13px; font-weight: 600; color: var(--tl-text-secondary); min-width: 0; }
.field em { font-style: normal; font-weight: 500; opacity: .8; }
.field input, .field select { font: 500 17px var(--font); color: var(--tl-text-primary); width: 100%; min-height: 50px; padding: 0 16px;
  border-radius: var(--tl-radius-md); border: 1px solid var(--tl-border-subtle); background: var(--tl-bg-card); -webkit-appearance: none; appearance: none; }
.field select { background-image: linear-gradient(45deg, transparent 50%, currentColor 50%), linear-gradient(135deg, currentColor 50%, transparent 50%);
  background-position: calc(100% - 22px) 50%, calc(100% - 16px) 50%; background-size: 6px 6px; background-repeat: no-repeat; }
.field input::placeholder { color: var(--tl-text-secondary); opacity: .7; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.status { margin: 0; min-height: 1.4em; font-size: 15px; }
.status.ok { color: var(--tl-accent-default) !important; }
.status.err { color: var(--tl-status-off) !important; }

/* FAQ */
.faq { display: grid; gap: 12px; margin-top: 28px; max-width: 860px; }
.faq details { padding: 0; border-radius: var(--tl-radius-xl); }
.faq summary { cursor: pointer; list-style: none; padding: 20px 56px 20px 22px; font-weight: 600; font-size: 17px; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: ""; position: absolute; right: 22px; top: 50%; width: 10px; height: 10px; margin-top: -7px;
  border-right: 2px solid var(--tl-accent-default); border-bottom: 2px solid var(--tl-accent-default); transform: rotate(45deg); transition: transform .2s; }
.faq details[open] summary::after { transform: rotate(-135deg); margin-top: -2px; }
.faq details p { margin: 0; padding: 0 22px 20px; font-size: 16px; }

/* Footer */
.footer { border-top: 1px solid var(--tl-border-hairline); margin-top: 40px; }
.footer-inner { max-width: var(--max); margin: 0 auto; padding: 36px var(--tl-space-xl) 48px; display: flex; flex-wrap: wrap; align-items: center; gap: 12px 28px;
  color: var(--tl-text-secondary); font-size: 15px; }
.footer-inner p { margin: 0; }
.footer .app-icon { width: 28px; height: 28px; border-radius: 7px; }
.footer .wordmark { height: 16px; }
.footer-links { display: flex; gap: 18px; }
.footer-links a { color: var(--tl-text-secondary); text-decoration: none; font-weight: 500; }
.footer-links a:hover { color: var(--tl-accent-default); }
.legal { width: 100%; font-size: 13px; }

/* Responsive */
@media (max-width: 1080px) {
  .hero { grid-template-columns: 1fr; grid-template-areas: "copy" "devices" "cards"; padding-top: 36px; }
  .hero-copy { padding-top: 0; text-align: center; }
  .chips, .cta-row { justify-content: center; }
  .lede { margin-left: auto; margin-right: auto; }
  .hero-devices { max-width: 720px; width: 100%; margin: 0 auto; }
  h1 { font-size: clamp(44px, 9vw, 84px); }
  .links { display: none; }
  .nav-actions { margin-left: auto; }
}
@media (max-width: 860px) {
  .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px 16px; }
  .lab-grid { grid-template-columns: 1fr; gap: 36px; }
  .join-card { grid-template-columns: 1fr; padding: 28px; gap: 24px; }
  .hero-cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 560px) {
  body { font-size: 16px; }
  h1 { white-space: normal; font-size: clamp(44px, 13.4vw, 60px); }
  .nav { padding: 10px 12px 0; }
  .wordmark { height: 18px; }
  .hero { padding: 28px 16px 8px; row-gap: 24px; }
  .section { padding: 56px 16px; }
  .cards { grid-template-columns: 1fr; }
  .choice, .field-row { grid-template-columns: 1fr; }
  .join-card { padding: 22px 18px; border-radius: var(--tl-radius-2xl); }
  .lab-copy > p { font-size: 17px; }
  .d-solo { max-width: 260px; }
  .btn { min-height: 50px; padding: 0 22px; }
  .cta-row .btn { flex: 1 1 100%; }
  .hero-devices { padding-bottom: 8px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; } }
:root:not([data-theme]) .only-dark { display: none !important; }

/* Signup: beta-only bits, Apple ID note, checkbox, segmented review */
.signup:not(.is-beta) .beta-only { display: none !important; }
.signup.is-beta .waitlist-only { display: none !important; }
.appleid-note { display: flex; gap: 12px; align-items: flex-start; padding: 14px 16px; border-radius: var(--tl-radius-md);
  background: var(--tl-accent-soft); border: 1.5px solid var(--tl-accent-line); color: var(--tl-text-primary); }
.appleid-note svg { flex: none; width: 20px; height: 20px; margin-top: 1px; fill: var(--tl-accent-default); }
.appleid-note p { margin: 0; font-size: 15px; line-height: 1.4; }
.check { display: flex; gap: 10px; align-items: center; font-size: 14px; font-weight: 600; color: var(--tl-text-primary); cursor: pointer; }
.check input { width: 20px; height: 20px; margin: 0; accent-color: var(--tl-accent-default); flex: none; }
.seg-field { border: 0; margin: 0; padding: 0; }
.seg-field legend { padding: 0; margin-bottom: 6px; line-height: 1.35; }
.seg { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.seg label { position: relative; cursor: pointer; }
.seg input { position: absolute; opacity: 0; inset: 0; }
.seg span { display: flex; align-items: center; justify-content: center; min-height: 46px; border-radius: var(--tl-radius-full);
  background: var(--tl-fill-subtle); border: 1.5px solid var(--tl-border-subtle); font: 600 16px var(--font); color: var(--tl-text-primary);
  transition: border-color .15s, background .15s; }
.seg input:checked + span { background: var(--tl-accent-soft); border-color: var(--tl-accent-default); color: var(--tl-accent-default); }
.seg input:focus-visible + span { outline: 3px solid var(--tl-accent-line); outline-offset: 2px; }
.field.invalid input, .field.invalid select, .seg-field.invalid .seg span { border-color: var(--tl-status-off); }

/* Hero badge: Figma shows a different badge on mobile */
.badge-mob { display: none; }
@media (max-width: 560px) { .badge-desk { display: none; } .badge-mob { display: inline; } }

/* Beta confirmation (shown only after a successful beta signup) */
.signup.is-done > :not(.status):not(.beta-confirm) { display: none !important; }
.signup.is-done .status { font-size: 17px; font-weight: 600; line-height: 1.4; color: var(--tl-text-primary) !important; }
.beta-confirm { display: grid; gap: 12px; padding: 18px; border-radius: var(--tl-radius-md);
  background: var(--tl-accent-soft); border: 1.5px solid var(--tl-accent-line); }
.beta-confirm[hidden] { display: none; }
.btn-tf { text-decoration: none; font-size: 17px; }
.btn-tf svg { width: 18px; height: 18px; fill: currentColor; }
.tf-note { margin: 0; font-size: 15px; line-height: 1.4; color: var(--tl-text-secondary, var(--tl-text-primary)); }
.tf-again { justify-self: start; padding: 0; border: 0; background: none; font: inherit; font-size: 14px;
  color: var(--tl-accent-default); text-decoration: underline; cursor: pointer; }

/* Social links */
.nav-social, .footer-social { display: flex; align-items: center; gap: 8px; }
.social-btn { width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; color: var(--tl-text-primary); text-decoration: none;
  background: var(--tl-bg-card); border: 1px solid var(--tl-border-hairline); box-shadow: 0 10px 30px -8px var(--tl-shadow-glass), inset 0 1px 0 var(--tl-glass-highlight);
  -webkit-backdrop-filter: blur(22px) saturate(1.4); backdrop-filter: blur(22px) saturate(1.4); transition: color .15s, border-color .15s; }
.social-btn svg { width: 17px; height: 17px; fill: currentColor; }
.social-btn:hover { color: var(--tl-accent-default); border-color: var(--tl-accent-line, var(--tl-border-hairline)); }
.social-btn:focus-visible, .tf-fb:focus-visible { outline: 2px solid var(--tl-accent-default); outline-offset: 2px; }
.footer-social { margin-left: auto; }
.footer-social .social-btn { width: 36px; height: 36px; box-shadow: none; }
.footer-social .social-btn svg { width: 16px; height: 16px; }
.tf-fb { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 8px 16px; border-radius: var(--tl-radius-full); text-align: center; line-height: 1.25;
  border: 1px solid var(--tl-accent-line, var(--tl-border-hairline)); background: var(--tl-bg-card); color: var(--tl-accent-default);
  font-size: 15px; font-weight: 600; text-decoration: none; }
.tf-fb svg { width: 18px; height: 18px; fill: currentColor; flex: none; }
.tf-fb:hover { background: var(--tl-fill-subtle, var(--tl-bg-card)); }
@media (max-width: 560px) { .nav-social { display: none; } .footer-social { margin-left: 0; } }