/* Design tokens — shadcn/ReUI-compatible variable model */
:root {
  --background: #ffffff;
  --foreground: #09090b;
  --card: #ffffff;
  --card-foreground: #09090b;
  --muted: #f4f4f5;
  --muted-foreground: #71717a;
  --primary: #4f6ef7;
  --primary-foreground: #ffffff;
  --border: #e4e4e7;
  --input: #e4e4e7;
  --ring: #4f6ef7;
  --success: #16a34a;
  --success-bg: #f0fdf4;
  --destructive: #dc2626;
  --destructive-bg: #fef2f2;
  --radius: 0.625rem;
  --font-sans: -apple-system, "SF Pro Text", "Segoe UI", Inter, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, monospace;
  --shadow-sm: 0 1px 2px rgb(0 0 0 / .05);
  --shadow-md: 0 4px 12px rgb(0 0 0 / .06);
  /* Motion — ease-out for entrances, spring-ish for emphasis, quick exits */
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --ease-out-quart: cubic-bezier(.165, .84, .44, 1);
  --ease-spring: cubic-bezier(.175, .885, .32, 1.1);
  --dur-fast: .15s;
  --dur-base: .3s;
  --dur-slow: .5s;
}
@media (prefers-color-scheme: dark) {
  :root {
    --background: #0a0a0b;
    --foreground: #fafafa;
    --card: #131316;
    --card-foreground: #fafafa;
    --muted: #1c1c21;
    --muted-foreground: #9d9da8;
    --primary: #6d86ff;
    --primary-foreground: #0a0a0b;
    --border: #26262c;
    --input: #2e2e35;
    --ring: #6d86ff;
    --success: #4ade80;
    --success-bg: rgb(74 222 128 / .1);
    --destructive: #f87171;
    --destructive-bg: rgb(248 113 113 / .1);
    --shadow-sm: none;
    --shadow-md: none;
  }
}

* { box-sizing: border-box; margin: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--background);
  color: var(--foreground);
  font: 16px/1.6 var(--font-sans);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
:focus-visible { outline: 2px solid var(--ring); outline-offset: 2px; border-radius: 4px; }

.container { max-width: 1024px; margin: 0 auto; padding: 0 24px; }
.container.narrow { max-width: 680px; }

/* Navbar */
.nav { display: flex; align-items: center; justify-content: space-between; padding: 20px 0; }
.brand { font-weight: 700; letter-spacing: -.02em; font-size: 17px; text-decoration: none; }
.brand span { color: var(--primary); }
.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a { color: var(--muted-foreground); text-decoration: none; font-size: 14px; padding: 8px 12px; border-radius: calc(var(--radius) - 2px); }
.nav-links a:hover { color: var(--foreground); background: var(--muted); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 18px; border-radius: var(--radius); border: 1px solid transparent;
  font: 600 14.5px var(--font-sans); text-decoration: none; cursor: pointer;
  transition: filter .15s var(--ease-out), background .15s var(--ease-out),
              border-color .15s var(--ease-out), transform .15s var(--ease-out), box-shadow .2s var(--ease-out);
}
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--primary); color: var(--primary-foreground); }
.btn-primary:hover { filter: brightness(1.08); }
.btn-outline { border-color: var(--border); color: var(--foreground); background: transparent; }
.btn-outline:hover { background: var(--muted); }
.btn-lg { padding: 13px 24px; font-size: 15.5px; }
.btn-block { width: 100%; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn .arrow { transition: transform .15s; }
.btn:hover .arrow { transform: translateX(3px); }

/* Cards */
.card {
  background: var(--card); color: var(--card-foreground);
  border: 1px solid var(--border); border-radius: calc(var(--radius) + 4px);
  box-shadow: var(--shadow-sm);
  transition: transform var(--dur-base) var(--ease-out-quart), box-shadow var(--dur-base) var(--ease-out-quart), border-color var(--dur-base) var(--ease-out);
}
@media (hover: hover) and (pointer: fine) { a.card:hover, .card.hoverable:hover { transform: translateY(-3px); box-shadow: 0 12px 32px rgb(0 0 0 / .12); } }
.card-pad { padding: 26px; }

/* Badges */
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  font: 600 11.5px var(--font-mono); text-transform: uppercase; letter-spacing: .08em;
  padding: 4px 10px; border-radius: 999px;
  background: color-mix(in srgb, var(--primary) 12%, transparent); color: var(--primary);
}

/* Alerts */
.alert { display: none; margin-top: 14px; padding: 12px 14px; border-radius: var(--radius); font-size: 13.5px; border: 1px solid transparent; }
.alert.show { display: block; }
.alert-success { background: var(--success-bg); color: var(--success); border-color: color-mix(in srgb, var(--success) 25%, transparent); }
.alert-error { background: var(--destructive-bg); color: var(--destructive); border-color: color-mix(in srgb, var(--destructive) 25%, transparent); }

/* Forms */
.field { margin-top: 16px; }
.field label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; }
.field .desc { font-size: 12.5px; color: var(--muted-foreground); font-weight: 400; }
.field input, .field textarea, .field select {
  width: 100%; background: var(--background); color: var(--foreground);
  border: 1px solid var(--input); border-radius: var(--radius);
  padding: 10px 12px; font: 14px var(--font-mono);
  transition: border-color .15s, box-shadow .15s;
}
.field textarea { min-height: 110px; resize: vertical; }
.field input:focus, .field textarea:focus { outline: none; border-color: var(--ring); box-shadow: 0 0 0 3px color-mix(in srgb, var(--ring) 20%, transparent); }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 560px) { .grid-2 { grid-template-columns: 1fr; } }

/* Stepper (ReUI pattern: numbered circles + separators) */
.stepper { display: flex; align-items: flex-start; margin: 28px 0; }
.step { display: flex; flex-direction: column; align-items: center; gap: 8px; flex: 0 0 auto; width: 120px; text-align: center; }
.step-circle {
  width: 34px; height: 34px; border-radius: 999px; display: grid; place-items: center;
  border: 2px solid var(--border); color: var(--muted-foreground);
  font: 700 14px var(--font-sans); background: var(--card); transition: all .2s;
}
.step-label { font-size: 12.5px; color: var(--muted-foreground); font-weight: 600; }
.step.active .step-circle { border-color: var(--primary); color: var(--primary); }
.step.active .step-label { color: var(--foreground); }
.step.done .step-circle { background: var(--primary); border-color: var(--primary); color: var(--primary-foreground); }
.step-sep { flex: 1 1 auto; height: 2px; background: var(--border); margin-top: 16px; border-radius: 1px; }
.step-sep.done { background: var(--primary); }

code, .code {
  font: 12.5px var(--font-mono); background: var(--muted);
  border: 1px solid var(--border); border-radius: 6px; padding: 2px 6px; word-break: break-all;
}

footer.site { border-top: 1px solid var(--border); margin-top: 72px; padding: 28px 0 48px; color: var(--muted-foreground); font-size: 13.5px; text-align: center; }
footer.site a { color: var(--muted-foreground); }

/* ReUI badge variants (ported: variant + -light naming) */
.badge-success-light { background: color-mix(in srgb, var(--success) 13%, transparent); color: var(--success); }
.badge-warning-light { background: rgb(245 158 11 / .16); color: #d97706; }
.badge-secondary { background: var(--muted); color: var(--muted-foreground); }
.badge-destructive-light { background: color-mix(in srgb, var(--destructive) 13%, transparent); color: var(--destructive); }

/* ReUI switch (ported) */
.switch { appearance: none; width: 36px; height: 21px; border-radius: 999px; background: var(--input); position: relative; cursor: pointer; border: 0; transition: background .2s var(--ease-out); flex: 0 0 auto; }
.switch::after { content: ""; position: absolute; top: 2px; left: 2px; width: 17px; height: 17px; border-radius: 999px; background: #fff; box-shadow: 0 1px 2px rgb(0 0 0 / .25); transition: transform .2s var(--ease-out-quart); }
.switch:checked { background: var(--primary); }
.switch:checked::after { transform: translateX(15px); }
.switch:disabled { opacity: .45; cursor: not-allowed; }

/* ReUI vertical stepper (ported: Item > Trigger > Indicator + Title/Description, Separator) */
.vstep { display: flex; gap: 12px; }
.vstep .vs-rail { display: flex; flex-direction: column; align-items: center; }
.vstep .vs-ind { width: 26px; height: 26px; border-radius: 999px; border: 2px solid var(--border); background: var(--card); color: var(--muted-foreground); font: 700 12px var(--font-sans); display: grid; place-items: center; transition: all .2s var(--ease-out); }
.vstep .vs-sep { flex: 1; width: 2px; background: var(--border); margin: 4px 0; border-radius: 1px; min-height: 18px; }
.vstep .vs-body { padding-bottom: 20px; min-width: 0; }
.vstep .vs-title { font-size: 13.5px; font-weight: 700; }
.vstep .vs-desc { font-size: 12.5px; color: var(--muted-foreground); margin-top: 3px; line-height: 1.55; }
.vstep .vs-desc a { color: var(--primary); }
.vstep .vs-desc ol { margin: 6px 0 0 16px; padding: 0; }
.vstep .vs-desc li { margin: 3px 0; }
.vstep[data-state="active"] .vs-ind { border-color: var(--primary); color: var(--primary); }
.vstep[data-state="active"] .vs-title { color: var(--primary); }
.vstep[data-state="completed"] .vs-ind { background: var(--primary); border-color: var(--primary); color: var(--primary-foreground); }
.vstep[data-state="completed"] .vs-sep { background: var(--primary); }