/* Glassy design tokens + primitives. Warm monochrome; color only carries meaning. */

:root {
  --bg: #FBFBFA;
  --surface: #FFFFFF;
  --surface-2: #F7F6F3;
  --surface-3: #F1F0EC;
  --border: #EAEAEA;
  --border-strong: #DAD8D3;
  --text: #2F3437;
  --text-strong: #111111;
  --muted: #787774;
  --faint: #A6A39D;
  --accent: #111111;
  --accent-hover: #333333;
  --accent-text: #FFFFFF;
  --focus: #1F6C9F;

  --red-bg: #FDEBEC;   --red: #9F2F2D;
  --blue-bg: #E1F3FE;  --blue: #1F6C9F;
  --green-bg: #EDF3EC; --green: #346538;
  --yellow-bg: #FBF3DB; --yellow: #956400;
  --violet-bg: #F0EBF8; --violet: #5B3F8C;

  /* System fonts only: no third-party font requests (which send visitors' IP addresses to another company). */
  --serif: ui-serif, 'New York', 'Iowan Old Style', Charter, Georgia, serif;
  --sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, system-ui, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --mono: ui-monospace, 'SF Mono', 'Cascadia Mono', Menlo, Consolas, monospace;

  --radius: 10px;
  --radius-sm: 6px;
  --shadow-hover: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-pop: 0 12px 32px rgba(17, 17, 17, 0.08), 0 1px 2px rgba(17, 17, 17, 0.04);
  --ease: cubic-bezier(0.16, 1, 0.3, 1);

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161615;
    --surface: #1D1D1C;
    --surface-2: #232322;
    --surface-3: #2A2A28;
    --border: #2E2E2C;
    --border-strong: #3B3B38;
    --text: #D8D7D2;
    --text-strong: #F4F3EF;
    --muted: #9A9893;
    --faint: #6D6B67;
    --accent: #F4F3EF;
    --accent-hover: #DEDDD8;
    --accent-text: #141414;
    --focus: #8CC6EE;

    --red-bg: #3A2224;   --red: #F1A9A5;
    --blue-bg: #1C2F3D;  --blue: #8CC6EE;
    --green-bg: #213025; --green: #9DCB9F;
    --yellow-bg: #362E1A; --yellow: #E4C46F;
    --violet-bg: #2B2438; --violet: #C3AEEA;

    --shadow-hover: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-pop: 0 12px 32px rgba(0, 0, 0, 0.45);
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 15px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, video, svg { display: block; max-width: 100%; }
[hidden] { display: none !important; }
a { color: inherit; text-decoration-color: var(--border-strong); text-underline-offset: 3px; }
a:hover { text-decoration-color: currentColor; }
h1, h2, h3, h4 { color: var(--text-strong); margin: 0; font-weight: 500; }
p { margin: 0; }
button, input, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; border-radius: 4px; }
::selection { background: var(--blue-bg); color: var(--text-strong); }

.serif { font-family: var(--serif); letter-spacing: -0.02em; }
.mono { font-family: var(--mono); font-size: 0.86em; letter-spacing: -0.01em; }
.muted { color: var(--muted); }
.faint { color: var(--faint); }
.small { font-size: 13px; }
.tiny { font-size: 12px; }
.eyebrow {
  font: 500 11px/1 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 36px; padding: 0 14px;
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--text-strong);
  font-size: 14px; font-weight: 500; line-height: 1; white-space: nowrap;
  cursor: pointer; text-decoration: none;
  transition: background-color 150ms ease, border-color 150ms ease, transform 120ms ease, color 150ms ease;
}
.btn:hover { background: var(--surface-2); }
.btn:active { transform: scale(0.98); }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; transform: none; }
.btn svg { width: 16px; height: 16px; flex: none; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-ghost { border-color: transparent; background: transparent; color: var(--text); }
.btn-ghost:hover { background: var(--surface-3); }
.btn-danger { color: var(--red); }
.btn-danger:hover { background: var(--red-bg); border-color: var(--red-bg); }
.btn-sm { height: 30px; padding: 0 10px; font-size: 13px; }
.btn-lg { height: 44px; padding: 0 20px; font-size: 15px; }
.btn-icon { width: 36px; padding: 0; }
.btn-sm.btn-icon { width: 30px; }

/* Forms */
.field { display: grid; gap: 6px; }
.field > label, .label { font-size: 13px; font-weight: 500; color: var(--text-strong); }
.hint { font-size: 12.5px; color: var(--muted); }
.input, .select, .textarea {
  width: 100%;
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--text-strong);
  padding: 8px 11px; font-size: 14px; line-height: 1.45;
  transition: border-color 150ms ease, box-shadow 150ms ease;
}
.input, .select { height: 38px; }
.textarea { resize: vertical; min-height: 120px; }
.input::placeholder, .textarea::placeholder { color: var(--faint); }
.input:focus, .select:focus, .textarea:focus { outline: none; border-color: var(--text-strong); box-shadow: 0 0 0 3px var(--surface-3); }
.input[aria-invalid="true"] { border-color: var(--red); }
.select {
  appearance: none; padding-right: 30px;
  background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position: calc(100% - 15px) 16px, calc(100% - 10px) 16px;
  background-size: 5px 5px; background-repeat: no-repeat;
}

/* Badges */
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  height: 20px; padding: 0 8px; border-radius: 9999px;
  font: 500 10.5px/1 var(--sans); text-transform: uppercase; letter-spacing: 0.06em; white-space: nowrap;
  background: var(--surface-3); color: var(--muted);
}
.badge-red { background: var(--red-bg); color: var(--red); }
.badge-blue { background: var(--blue-bg); color: var(--blue); }
.badge-green { background: var(--green-bg); color: var(--green); }
.badge-yellow { background: var(--yellow-bg); color: var(--yellow); }
.badge-violet { background: var(--violet-bg); color: var(--violet); }

kbd {
  display: inline-block; min-width: 20px; padding: 1px 6px;
  border: 1px solid var(--border); border-bottom-width: 2px; border-radius: 4px;
  background: var(--surface-2); color: var(--text);
  font: 500 11px/1.5 var(--mono); text-align: center;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.reveal { opacity: 0; transform: translateY(12px); transition: opacity 600ms var(--ease), transform 600ms var(--ease); transition-delay: calc(var(--i, 0) * 80ms); }
.reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 1ms !important; transition-duration: 1ms !important; }
  .reveal { opacity: 1; transform: none; }
}