/* ============================================================
   MERIDIAN — design tokens & base styles
   Cool-neutral enterprise palette, light + dark, accent derived
   from a single hue so the Tweaks accent swap stays harmonious.
   ============================================================ */

:root {
  /* fonts (swappable via tweaks) */
  --font-display: "Schibsted Grotesk", "Hanken Grotesk", system-ui, sans-serif;
  --font-body: "Hanken Grotesk", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --font-cjk: "Noto Sans SC", sans-serif;

  /* accent — single source hex, ramp derived via color-mix */
  --accent: #4f5bd5;
  --accent-strong: color-mix(in oklab, var(--accent), #000 14%);
  --accent-quiet: color-mix(in oklab, var(--accent), #000 4%);
  --accent-soft: color-mix(in oklab, var(--accent) 13%, var(--surface));
  --accent-line: color-mix(in oklab, var(--accent) 30%, var(--line));
  --accent-fg: #ffffff;
  --ring: color-mix(in oklab, var(--accent) 45%, transparent);

  /* radius (swappable) */
  --r-xs: 6px;
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 22px;
  --r-card: var(--r-lg);
  --r-btn: 10px;

  /* density (swappable) — section vertical rhythm */
  --pad-section: 112px;
  --gap-grid: 24px;

  /* light theme */
  --canvas: oklch(0.985 0.003 264);
  --surface: #ffffff;
  --surface-2: oklch(0.978 0.004 264);
  --sunken: oklch(0.968 0.005 264);
  --line: oklch(0.918 0.006 264);
  --line-soft: oklch(0.945 0.005 264);
  --line-strong: oklch(0.86 0.008 264);
  --ink: oklch(0.24 0.024 264);
  --ink-strong: oklch(0.18 0.03 264);
  --muted: oklch(0.48 0.018 264);
  --subtle: oklch(0.62 0.012 264);
  --faint: oklch(0.74 0.008 264);

  --success: oklch(0.6 0.13 158);
  --success-soft: color-mix(in oklab, var(--success) 12%, var(--surface));
  --warning: oklch(0.7 0.13 66);
  --warning-soft: color-mix(in oklab, var(--warning) 14%, var(--surface));
  --danger: oklch(0.58 0.2 22);
  --danger-soft: color-mix(in oklab, var(--danger) 11%, var(--surface));
  --info: var(--accent);

  --shadow-xs: 0 1px 2px rgba(16, 18, 38, 0.05);
  --shadow-sm: 0 1px 2px rgba(16, 18, 38, 0.06), 0 2px 6px rgba(16, 18, 38, 0.04);
  --shadow-md: 0 4px 12px rgba(16, 18, 38, 0.07), 0 12px 28px rgba(16, 18, 38, 0.06);
  --shadow-lg: 0 18px 40px rgba(16, 18, 38, 0.12), 0 4px 12px rgba(16, 18, 38, 0.06);
  --shadow-accent: 0 8px 24px color-mix(in oklab, var(--accent) 30%, transparent);

  /* inverse — always-dark backgrounds for hero/CTA sections */
  --inv-bg: oklch(0.18 0.03 264);
  --inv-text: oklch(0.97 0.004 265);
  --inv-muted: oklch(0.73 0.013 265);
  --inv-subtle: oklch(0.58 0.013 265);
  --inv-border: oklch(0.305 0.018 265);

  color-scheme: light;
}

[data-theme="dark"] {
  --canvas: oklch(0.165 0.015 265);
  --surface: oklch(0.205 0.016 265);
  --surface-2: oklch(0.232 0.017 265);
  --sunken: oklch(0.145 0.013 265);
  --line: oklch(0.305 0.018 265);
  --line-soft: oklch(0.26 0.016 265);
  --line-strong: oklch(0.38 0.02 265);
  --ink: oklch(0.97 0.004 265);
  --ink-strong: oklch(0.99 0.003 265);
  --muted: oklch(0.73 0.013 265);
  --subtle: oklch(0.58 0.013 265);
  --faint: oklch(0.46 0.012 265);

  --accent-soft: color-mix(in oklab, var(--accent) 24%, var(--surface));
  --accent-quiet: color-mix(in oklab, var(--accent), #fff 4%);

  --success: oklch(0.72 0.14 158);
  --warning: oklch(0.78 0.13 70);
  --danger: oklch(0.68 0.18 22);

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 6px 18px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 24px 50px rgba(0, 0, 0, 0.55);
  --shadow-accent: 0 10px 30px color-mix(in oklab, var(--accent) 45%, transparent);

  color-scheme: dark;
}

/* density variants */
[data-density="compact"] { --pad-section: 76px; --gap-grid: 18px; }
[data-density="comfortable"] { --pad-section: 132px; --gap-grid: 28px; }

/* radius variants */
[data-radius="sharp"] { --r-card: 7px; --r-btn: 6px; --r-lg: 9px; --r-md: 7px; --r-xl: 12px; }
[data-radius="rounded"] { --r-card: 22px; --r-btn: 14px; --r-lg: 22px; --r-md: 16px; --r-xl: 30px; }

/* font variants */
[data-fontset="geometric"] { --font-display: "Space Grotesk", "Hanken Grotesk", sans-serif; }
[data-fontset="editorial"] { --font-display: "Spectral", Georgia, serif; }

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--canvas);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "cv05" 1, "ss01" 1;
}
:lang(zh) { font-family: var(--font-cjk); }

h1, h2, h3, h4, h5 { font-family: var(--font-display); font-weight: 600; letter-spacing: -0.02em; margin: 0; color: var(--ink-strong); }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; margin: 0; padding: 0; }
button { font-family: inherit; }
/* preflight is off (Tailwind) — reset bare buttons so they don't show UA chrome */
button:not([class*="twk-"]) { background-color: transparent; border: 0; color: inherit; cursor: pointer; }
.font-display { font-family: var(--font-display); }
.font-mono { font-family: var(--font-mono); }

/* selection + focus */
::selection { background: color-mix(in oklab, var(--accent) 22%, transparent); }
:focus-visible { outline: 2px solid var(--ring); outline-offset: 2px; border-radius: 4px; }

/* scrollbar */
*::-webkit-scrollbar { width: 11px; height: 11px; }
*::-webkit-scrollbar-thumb { background: color-mix(in oklab, var(--ink) 18%, transparent); border-radius: 99px; border: 3px solid transparent; background-clip: content-box; }
*::-webkit-scrollbar-thumb:hover { background: color-mix(in oklab, var(--ink) 30%, transparent); background-clip: content-box; }

/* ---- component layer ---- */
.mwrap { width: 100%; max-width: 1240px; margin: 0 auto; padding-left: 24px; padding-right: 24px; }
@media (max-width: 640px) { .mwrap { padding-left: 18px; padding-right: 18px; } }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11.5px; font-weight: 500;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent);
}
.eyebrow-muted { color: var(--muted); }

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-weight: 550; font-size: 14px; line-height: 1;
  padding: 0 18px; height: 44px; border-radius: var(--r-btn);
  border: 1px solid transparent; cursor: pointer; white-space: nowrap;
  transition: transform .12s cubic-bezier(.3,.7,.4,1), background .15s, box-shadow .15s, border-color .15s, color .15s;
  user-select: none;
}
.btn:active { transform: translateY(1px) scale(0.99); }
.btn-sm { height: 36px; padding: 0 14px; font-size: 13px; }
.btn-lg { height: 50px; padding: 0 24px; font-size: 15px; }
.btn-primary { background: var(--accent); color: var(--accent-fg); box-shadow: var(--shadow-accent); }
.btn-primary:hover { background: var(--accent-strong); box-shadow: 0 10px 30px color-mix(in oklab, var(--accent) 42%, transparent); }
.btn-secondary { background: var(--surface); color: var(--ink); border-color: var(--line-strong); box-shadow: var(--shadow-xs); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: var(--sunken); }
.btn-soft { background: var(--accent-soft); color: var(--accent-strong); }
.btn-soft:hover { background: color-mix(in oklab, var(--accent) 20%, var(--surface)); }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }

/* cards */
.card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--r-card); box-shadow: var(--shadow-xs);
}
.card-hover { transition: transform .2s cubic-bezier(.3,.7,.4,1), box-shadow .2s, border-color .2s; }
.card-hover:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--line-strong); }

/* badges */
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 12px; font-weight: 550; line-height: 1;
  padding: 4px 9px; border-radius: 99px; border: 1px solid transparent;
}
.badge-neutral { background: var(--sunken); color: var(--muted); border-color: var(--line); }
.badge-accent { background: var(--accent-soft); color: var(--accent-strong); border-color: var(--accent-line); }
.badge-success { background: var(--success-soft); color: color-mix(in oklab, var(--success), #000 25%); border-color: color-mix(in oklab, var(--success) 30%, transparent); }
.badge-warning { background: var(--warning-soft); color: color-mix(in oklab, var(--warning), #000 35%); border-color: color-mix(in oklab, var(--warning) 32%, transparent); }
.badge-danger { background: var(--danger-soft); color: color-mix(in oklab, var(--danger), #000 18%); border-color: color-mix(in oklab, var(--danger) 30%, transparent); }
[data-theme="dark"] .badge-success { color: var(--success); }
[data-theme="dark"] .badge-warning { color: var(--warning); }
[data-theme="dark"] .badge-danger { color: var(--danger); }

/* inputs */
.field {
  width: 100%; height: 46px; padding: 0 14px;
  background: var(--surface); color: var(--ink);
  border: 1px solid var(--line-strong); border-radius: var(--r-btn);
  font-size: 14px; font-family: inherit; outline: none;
  transition: border-color .15s, box-shadow .15s, background .15s;
}
.field::placeholder { color: var(--faint); }
.field:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--ring); }
.field-invalid { border-color: var(--danger); }
.field-invalid:focus { box-shadow: 0 0 0 3px color-mix(in oklab, var(--danger) 30%, transparent); }
textarea.field { height: auto; padding: 12px 14px; resize: vertical; line-height: 1.55; }

.divider { height: 1px; background: var(--line); border: 0; }

/* surfaces / motifs */
.dotgrid {
  background-image: radial-gradient(color-mix(in oklab, var(--ink) 12%, transparent) 1px, transparent 1px);
  background-size: 22px 22px;
}
.hairline-grid {
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
}

/* image placeholder */
.ph {
  background-color: var(--sunken);
  background-image: repeating-linear-gradient(135deg, color-mix(in oklab, var(--ink) 6%, transparent) 0 1px, transparent 1px 11px);
  display: flex; align-items: center; justify-content: center;
  color: var(--faint); font-family: var(--font-mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase;
}

/* keyframes — note: this preview renders CSS animations frozen at t=0, so entrance
   keyframes must NEVER start from opacity:0 (content would stay invisible). They are
   transform-only; in a live browser they still animate, in a snapshot they stay visible. */
@keyframes fadeUp { from { transform: translateY(12px); } to { transform: none; } }
@keyframes fadeIn { from { opacity: 1; } to { opacity: 1; } }
@keyframes scaleIn { from { transform: scale(.985); } to { transform: none; } }
@keyframes shimmer { 100% { transform: translateX(100%); } }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse-soft { 0%,100% { opacity: 1; } 50% { opacity: .45; } }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }
@keyframes drawline { from { stroke-dashoffset: var(--len); } to { stroke-dashoffset: 0; } }

.animate-fadeUp { animation: fadeUp .6s cubic-bezier(.2,.7,.3,1); }
.animate-fadeIn { animation: fadeIn .5s ease; }
.animate-scaleIn { animation: scaleIn .28s cubic-bezier(.2,.7,.3,1); }
.reveal { opacity: 1; }
.reveal.in { animation: fadeUp .6s cubic-bezier(.2,.7,.3,1); }

.skeleton { position: relative; overflow: hidden; background: var(--sunken); border-radius: 8px; }
.skeleton::after { content: ""; position: absolute; inset: 0; transform: translateX(-100%); background: linear-gradient(90deg, transparent, color-mix(in oklab, var(--ink) 7%, transparent), transparent); animation: shimmer 1.4s infinite; }

.spinner { width: 18px; height: 18px; border-radius: 50%; border: 2px solid color-mix(in oklab, currentColor 25%, transparent); border-top-color: currentColor; animation: spin .7s linear infinite; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .05ms !important; }
}

/* utility */
.tnum { font-variant-numeric: tabular-nums; }
.clamp-2 { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.clamp-3 { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.no-scrollbar::-webkit-scrollbar { display: none; }
.no-scrollbar { scrollbar-width: none; }
.grad-text { background: linear-gradient(100deg, var(--ink-strong), color-mix(in oklab, var(--accent) 75%, var(--ink-strong))); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }