/* ============================================================
   Framework — A minimal, indie CSS framework
   Typography: Pretendard | Palette: Neutral
   ============================================================ */

@import url("https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/static/pretendard-dynamic-subset.min.css");

/* ── Tokens ─────────────────────────────────────────────── */
:root {
  /* Palette */
  --neutral-50:  oklch(0.985 0 0);
  --neutral-100: oklch(0.97 0 0);
  --neutral-200: oklch(0.922 0 0);
  --neutral-300: oklch(0.87 0 0);
  --neutral-400: oklch(0.715 0 0);
  --neutral-500: oklch(0.556 0 0);
  --neutral-600: oklch(0.439 0 0);
  --neutral-700: oklch(0.371 0 0);
  --neutral-800: oklch(0.269 0 0);
  --neutral-900: oklch(0.205 0 0);
  --neutral-950: oklch(0.145 0 0);

  /* Semantic */
  --color-bg:          var(--neutral-50);
  --color-surface:     #ffffff;
  --color-surface-2:   var(--neutral-100);
  --color-border:      var(--neutral-200);
  --color-border-strong: var(--neutral-300);
  --color-text:        var(--neutral-900);
  --color-text-2:      var(--neutral-600);
  --color-text-3:      var(--neutral-400);
  --color-accent:      var(--neutral-900);
  --color-accent-text: var(--neutral-50);
  --color-focus:       var(--neutral-900);

  /* Typography */
  --font-sans: "Pretendard", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Consolas", monospace;

  --text-xs:   0.75rem;     /* 12px */
  --text-sm:   0.875rem;    /* 14px */
  --text-base: 1rem;        /* 16px */
  --text-md:   1.0625rem;   /* 17px */
  --text-lg:   1.1875rem;   /* 19px */
  --text-xl:   1.4375rem;   /* 23px */
  --text-2xl:  1.8125rem;   /* 29px */
  --text-3xl:  2.375rem;    /* 38px */
  --text-4xl:  3.125rem;    /* 50px */

  --leading-tight:  1.2;
  --leading-snug:   1.4;
  --leading-normal: 1.6;
  --leading-loose:  1.8;

  --tracking-tight:  -0.03em;
  --tracking-snug:   -0.02em;
  --tracking-normal: -0.01em;
  --tracking-wide:    0.04em;
  --tracking-wider:   0.08em;

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Radius */
  --radius-sm:   4px;
  --radius-md:   7px;
  --radius-lg:   11px;
  --radius-xl:   16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs:  0 1px 2px 0 oklch(0 0 0 / 0.05);
  --shadow-sm:  0 1px 3px 0 oklch(0 0 0 / 0.08), 0 1px 2px -1px oklch(0 0 0 / 0.06);
  --shadow-md:  0 4px 12px -2px oklch(0 0 0 / 0.08), 0 2px 6px -2px oklch(0 0 0 / 0.05);
  --shadow-lg:  0 12px 32px -4px oklch(0 0 0 / 0.1), 0 4px 12px -4px oklch(0 0 0 / 0.06);
  --shadow-xl:  0 24px 48px -8px oklch(0 0 0 / 0.14), 0 8px 24px -8px oklch(0 0 0 / 0.08);

  /* Transitions */
  --ease:        cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in:     cubic-bezier(0.4, 0, 1, 1);
  --ease-out:    cubic-bezier(0, 0, 0.2, 1);
  --transition:  150ms var(--ease);
  --transition-slow: 280ms var(--ease);
}

/* ── Dark mode ──────────────────────────────────────────── */
[data-theme="light"] {
  color-scheme: light;
  --color-bg:          var(--neutral-50);
  --color-surface:     #ffffff;
  --color-surface-2:   var(--neutral-100);
  --color-border:      var(--neutral-200);
  --color-border-strong: var(--neutral-300);
  --color-text:        var(--neutral-900);
  --color-text-2:      var(--neutral-600);
  --color-text-3:      var(--neutral-400);
  --color-accent:      var(--neutral-900);
  --color-accent-text: var(--neutral-50);
  --color-focus:       var(--neutral-900);

  --shadow-xs:  0 1px 2px 0 oklch(0 0 0 / 0.05);
  --shadow-sm:  0 1px 3px 0 oklch(0 0 0 / 0.08), 0 1px 2px -1px oklch(0 0 0 / 0.06);
  --shadow-md:  0 4px 12px -2px oklch(0 0 0 / 0.08), 0 2px 6px -2px oklch(0 0 0 / 0.05);
  --shadow-lg:  0 12px 32px -4px oklch(0 0 0 / 0.1), 0 4px 12px -4px oklch(0 0 0 / 0.06);
  --shadow-xl:  0 24px 48px -8px oklch(0 0 0 / 0.14), 0 8px 24px -8px oklch(0 0 0 / 0.08);
}

@media (prefers-color-scheme: dark) {
  :root { color-scheme: dark; }
  :root:not([data-theme="light"]) {
    --color-bg:           var(--neutral-950);
    --color-surface:      var(--neutral-900);
    --color-surface-2:    var(--neutral-800);
    --color-border:       var(--neutral-800);
    --color-border-strong: var(--neutral-700);
    --color-text:         var(--neutral-50);
    --color-text-2:       var(--neutral-400);
    --color-text-3:       var(--neutral-600);
    --color-accent:       var(--neutral-50);
    --color-accent-text:  var(--neutral-950);
    --color-focus:        var(--neutral-200);

    --shadow-xs:  0 1px 2px 0 oklch(0 0 0 / 0.3);
    --shadow-sm:  0 1px 3px 0 oklch(0 0 0 / 0.4), 0 1px 2px -1px oklch(0 0 0 / 0.3);
    --shadow-md:  0 4px 12px -2px oklch(0 0 0 / 0.5), 0 2px 6px -2px oklch(0 0 0 / 0.4);
    --shadow-lg:  0 12px 32px -4px oklch(0 0 0 / 0.6), 0 4px 12px -4px oklch(0 0 0 / 0.4);
    --shadow-xl:  0 24px 48px -8px oklch(0 0 0 / 0.7), 0 8px 24px -8px oklch(0 0 0 / 0.5);
  }
}

[data-theme="dark"] {
  color-scheme: dark;
  --color-bg:           var(--neutral-950);
  --color-surface:      var(--neutral-900);
  --color-surface-2:    var(--neutral-800);
  --color-border:       var(--neutral-800);
  --color-border-strong: var(--neutral-700);
  --color-text:         var(--neutral-50);
  --color-text-2:       var(--neutral-400);
  --color-text-3:       var(--neutral-600);
  --color-accent:       var(--neutral-50);
  --color-accent-text:  var(--neutral-950);
  --color-focus:        var(--neutral-200);

  --shadow-xs:  0 1px 2px 0 oklch(0 0 0 / 0.3);
  --shadow-sm:  0 1px 3px 0 oklch(0 0 0 / 0.4), 0 1px 2px -1px oklch(0 0 0 / 0.3);
  --shadow-md:  0 4px 12px -2px oklch(0 0 0 / 0.5), 0 2px 6px -2px oklch(0 0 0 / 0.4);
  --shadow-lg:  0 12px 32px -4px oklch(0 0 0 / 0.6), 0 4px 12px -4px oklch(0 0 0 / 0.4);
  --shadow-xl:  0 24px 48px -8px oklch(0 0 0 / 0.7), 0 8px 24px -8px oklch(0 0 0 / 0.5);
}

/* ── Reset & Base ───────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  tab-size: 4;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: var(--leading-normal);
  letter-spacing: var(--tracking-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* ── Typography ─────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 600;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text);
}

h1 { font-size: var(--text-4xl); letter-spacing: -0.04em; font-weight: 700; }
h2 { font-size: var(--text-3xl); letter-spacing: -0.03em; }
h3 { font-size: var(--text-2xl); letter-spacing: -0.025em; }
h4 { font-size: var(--text-xl);  letter-spacing: -0.02em; }
h5 { font-size: var(--text-lg);  letter-spacing: -0.015em; }
h6 { font-size: var(--text-base); letter-spacing: var(--tracking-normal); }

p {
  line-height: var(--leading-normal);
  color: var(--color-text-2);
  max-width: 68ch;
}

p + p { margin-top: var(--space-4); }

small, .text-sm { font-size: var(--text-sm); }
.text-xs         { font-size: var(--text-xs); }
.text-lg         { font-size: var(--text-lg); }
.text-xl         { font-size: var(--text-xl); }

.text-muted  { color: var(--color-text-2); }
.text-faint  { color: var(--color-text-3); }
.text-strong { color: var(--color-text); }

strong, b  { font-weight: 600; color: var(--color-text); }
em, i      { font-style: italic; }
s, del     { text-decoration: line-through; color: var(--color-text-3); }

a {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-border-strong);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--transition);
}
a:hover { text-decoration-color: var(--color-text); }

code, kbd, samp, pre {
  font-family: var(--font-mono);
  font-size: 0.875em;
}

code {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1px 5px;
  letter-spacing: 0;
}

pre {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  overflow-x: auto;
  font-size: var(--text-sm);
  line-height: 1.7;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
}

kbd {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-bottom-width: 2px;
  border-radius: var(--radius-sm);
  padding: 1px 6px;
  font-size: var(--text-xs);
  color: var(--color-text-2);
}

blockquote {
  border-left: 2px solid var(--color-border-strong);
  padding: var(--space-1) 0 var(--space-1) var(--space-5);
  color: var(--color-text-2);
  font-style: italic;
}

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-8) 0;
}

ul, ol {
  padding-left: var(--space-5);
  color: var(--color-text-2);
}
li { line-height: var(--leading-normal); margin-top: var(--space-1); }
li:first-child { margin-top: 0; }

label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: var(--tracking-normal);
  display: block;
  margin-bottom: var(--space-2);
}

.label-hint {
  font-size: var(--text-xs);
  color: var(--color-text-3);
  font-weight: 400;
  margin-left: var(--space-2);
}

/* ── Layout — Container ─────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.container-sm  { max-width: 640px; }
.container-md  { max-width: 800px; }
.container-lg  { max-width: 1120px; }
.container-xl  { max-width: 1400px; }

@media (max-width: 640px) {
  .container { padding-inline: var(--space-4); }
}

/* ── Layout — Grid ──────────────────────────────────────── */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-auto { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }

@media (max-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .grid { gap: var(--space-4); }
}

/* ── Layout — Stack & Cluster ───────────────────────────── */
.stack { display: flex; flex-direction: column; }
.stack-1  { gap: var(--space-1); }
.stack-2  { gap: var(--space-2); }
.stack-3  { gap: var(--space-3); }
.stack-4  { gap: var(--space-4); }
.stack-6  { gap: var(--space-6); }
.stack-8  { gap: var(--space-8); }
.stack-12 { gap: var(--space-12); }

.cluster { display: flex; flex-wrap: wrap; align-items: center; }
.cluster-2  { gap: var(--space-2); }
.cluster-3  { gap: var(--space-3); }
.cluster-4  { gap: var(--space-4); }

/* ── Landmarks & Sections ───────────────────────────────── */
.section {
  padding-block: var(--space-16);
}

.section-sm  { padding-block: var(--space-10); }
.section-lg  { padding-block: var(--space-24); }

.section-header {
  margin-bottom: var(--space-10);
}

.section-header h2,
.section-header h3 {
  margin-bottom: var(--space-2);
}

.section-label {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-text-3);
  margin-bottom: var(--space-3);
}

/* ── Nav ────────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: color-mix(in oklch, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(12px) saturate(1.4);
  -webkit-backdrop-filter: blur(12px) saturate(1.4);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  height: 54px;
  padding-inline: var(--space-6);
  max-width: 1120px;
  margin-inline: auto;
}

.nav-brand {
  font-size: var(--text-base);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  color: var(--color-text);
  text-decoration: none;
  flex-shrink: 0;
}
.nav-brand:hover { text-decoration: none; color: var(--color-text); }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-links li {
  margin-top: 0;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 450;
  color: var(--color-text-2);
  text-decoration: none;
  border-radius: var(--radius-md);
  letter-spacing: var(--tracking-normal);
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--color-text);
}

.nav-links a.active {
  color: var(--color-text);
  font-weight: 500;
}

.nav-spacer { flex: 1; }

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* ── Buttons ────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 9px var(--space-5);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: 500;
  line-height: 1;
  letter-spacing: var(--tracking-normal);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition), color var(--transition),
              border-color var(--transition), box-shadow var(--transition),
              opacity var(--transition);
  user-select: none;
  white-space: nowrap;
  text-decoration: none;
  outline: none;
}

.btn:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.btn:disabled, .btn[aria-disabled="true"] {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

/* Primary */
.btn-primary {
  background: var(--color-accent);
  color: var(--color-accent-text);
  border-color: var(--color-accent);
}
.btn-primary:hover {
  background: color-mix(in oklch, var(--color-accent), var(--color-bg) 18%);
  border-color: color-mix(in oklch, var(--color-accent), var(--color-bg) 18%);
}
.btn-primary:active {
  background: color-mix(in oklch, var(--color-accent), var(--color-bg) 36%);
  border-color: color-mix(in oklch, var(--color-accent), var(--color-bg) 36%);
}

/* Secondary */
.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
  box-shadow: var(--shadow-xs);
}
.btn-secondary:hover {
  background: var(--color-surface-2);
  border-color: var(--color-border-strong);
}
.btn-secondary:active {
  background: var(--color-border);
  border-color: var(--color-border-strong);
}

/* Ghost */
.btn-ghost {
  background: transparent;
  color: var(--color-text-2);
  border-color: transparent;
}
.btn-ghost:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}
.btn-ghost:active {
  background: var(--color-border);
  color: var(--color-text);
}

/* Sizes */
.btn-xs { padding: 5px var(--space-3); font-size: var(--text-xs); border-radius: var(--radius-sm); }
.btn-sm { padding: 7px var(--space-4); font-size: var(--text-sm); }
.btn-lg { padding: 13px var(--space-6); font-size: var(--text-lg); }

/* ── Form Controls — Shared ─────────────────────────────── */
.input,
.textarea,
.select {
  display: block;
  width: 100%;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 400;
  line-height: var(--leading-snug);
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 8px var(--space-3);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  appearance: none;
  -webkit-appearance: none;
  letter-spacing: var(--tracking-normal);
}

.input::placeholder,
.textarea::placeholder {
  color: var(--color-text-3);
}

.input:hover,
.textarea:hover,
.select:hover {
  border-color: var(--color-border-strong);
}

.input:focus,
.textarea:focus,
.select:focus {
  border-color: var(--color-text-3);
  box-shadow: 0 0 0 3px oklch(from var(--color-focus) l c h / 0.12);
}

.input:disabled,
.textarea:disabled,
.select:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background: var(--color-surface-2);
}

.input.is-error,
.textarea.is-error,
.select.is-error {
  border-color: oklch(0.55 0.18 25);
  box-shadow: 0 0 0 3px oklch(0.55 0.18 25 / 0.1);
}

/* Input sizes */
.input-sm { padding: 5px 10px; font-size: var(--text-xs); }
.input-lg { padding: 11px var(--space-4); font-size: var(--text-base); }

/* ── Textarea ────────────────────────────────────────────── */
.textarea {
  resize: vertical;
  min-height: 100px;
  line-height: var(--leading-normal);
}

/* ── Select ──────────────────────────────────────────────── */
.select {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' fill='none' viewBox='0 0 10 6'%3E%3Cpath stroke='%23888' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M1 1l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  padding-right: var(--space-8);
}

/* ── Field wrapper ───────────────────────────────────────── */
.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.field-hint {
  font-size: var(--text-xs);
  color: var(--color-text-3);
  line-height: var(--leading-snug);
}

.field-error {
  font-size: var(--text-xs);
  color: oklch(0.55 0.18 25);
}

/* Input with icon/addon */
.input-group {
  position: relative;
}

.input-group .input {
  padding-left: var(--space-8);
}

.input-group .input-icon {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-3);
  pointer-events: none;
  display: flex;
}

/* ── Checkbox ────────────────────────────────────────────── */
.checkbox-label,
.radio-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  cursor: pointer;
  user-select: none;
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--color-text);
  line-height: var(--leading-snug);
}

.checkbox-label input[type="checkbox"],
.radio-label input[type="radio"] {
  appearance: none;
  -webkit-appearance: none;
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  border: 1.5px solid var(--color-border-strong);
  background: var(--color-surface);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition),
              box-shadow var(--transition);
  position: relative;
  display: grid;
  place-items: center;
}

.checkbox-label input[type="checkbox"] {
  border-radius: var(--radius-sm);
}

.radio-label input[type="radio"] {
  border-radius: 50%;
}

.checkbox-label input[type="checkbox"]:checked,
.radio-label input[type="radio"]:checked {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.checkbox-label input[type="checkbox"]:checked::after {
  content: '';
  width: 9px;
  height: 5.5px;
  border-left: 1.5px solid var(--color-accent-text);
  border-bottom: 1.5px solid var(--color-accent-text);
  transform: rotate(-45deg) translateY(-1px);
}

.radio-label input[type="radio"]:checked::after {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-accent-text);
  border-radius: 50%;
}

.checkbox-label input[type="checkbox"]:focus-visible,
.radio-label input[type="radio"]:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.checkbox-label input[type="checkbox"]:hover:not(:checked),
.radio-label input[type="radio"]:hover:not(:checked) {
  border-color: var(--color-text-3);
}

/* ── Switch ──────────────────────────────────────────────── */
.switch-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  cursor: pointer;
  user-select: none;
  font-size: var(--text-sm);
  color: var(--color-text);
}

.switch-label input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  position: relative;
  width: 34px;
  height: 20px;
  background: var(--color-border-strong);
  border-radius: var(--radius-full);
  cursor: pointer;
  flex-shrink: 0;
  transition: background var(--transition);
}

.switch-label input[type="checkbox"]::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 14px;
  height: 14px;
  background: white;
  border-radius: 50%;
  box-shadow: var(--shadow-xs);
  transition: transform var(--transition), box-shadow var(--transition);
}

.switch-label input[type="checkbox"]:checked {
  background: var(--color-accent);
}

.switch-label input[type="checkbox"]:checked::after {
  transform: translateX(14px);
  box-shadow: var(--shadow-sm);
}

.switch-label input[type="checkbox"]:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* ── Range ───────────────────────────────────────────────── */
.range {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  height: 4px;
  background: var(--color-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  outline: none;
  accent-color: var(--color-accent);
}

.range::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  background: var(--color-accent);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 0 3px var(--color-bg), var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.range::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: var(--color-accent);
  border-radius: 50%;
  cursor: pointer;
  border: none;
  box-shadow: 0 0 0 3px var(--color-bg), var(--shadow-sm);
}

.range:hover::-webkit-slider-thumb {
  transform: scale(1.1);
}

.range:focus-visible {
  outline: none;
}

.range:focus-visible::-webkit-slider-thumb {
  box-shadow: 0 0 0 3px var(--color-bg), 0 0 0 5px var(--color-focus);
}

/* ── Card ────────────────────────────────────────────────── */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition-slow), border-color var(--transition-slow);
}

.card-hover:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-strong);
}

.card-body {
  padding: var(--space-5) var(--space-6);
}

.card-header {
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface-2);
}

.card-title {
  font-size: var(--text-base);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  color: var(--color-text);
  line-height: var(--leading-tight);
}

.card-description {
  font-size: var(--text-sm);
  color: var(--color-text-2);
  margin-top: var(--space-1);
  line-height: var(--leading-snug);
}

/* ── Badge / Tag ─────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px var(--space-2);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0;
  border-radius: var(--radius-sm);
  background: var(--color-surface-2);
  color: var(--color-text-2);
  border: 1px solid var(--color-border);
  line-height: 1.5;
}

.badge-solid {
  background: var(--color-accent);
  color: var(--color-accent-text);
  border-color: var(--color-accent);
}

/* ── Group ───────────────────────────────────────────────── */
.group {
  display: flex;
  align-items: center;
}

.group > .btn:not(:first-child),
.group > .input:not(:first-child) {
  border-left-width: 0;
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
}

.group > .btn:not(:last-child),
.group > .input:not(:last-child) {
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
}

/* Vertical group */
.group-vertical {
  display: flex;
  flex-direction: column;
}

.group-vertical > * + * {
  border-top-width: 0;
}

.group-vertical > *:not(:first-child) {
  border-top-left-radius: 0;
  border-top-right-radius: 0;
}

.group-vertical > *:not(:last-child) {
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

/* ── Dropdown (details / summary) ───────────────────────── */
details.dropdown {
  position: relative;
  display: inline-flex;
}

details.dropdown > summary {
  list-style: none;
  cursor: pointer;
  user-select: none;
}

details.dropdown > summary::-webkit-details-marker { display: none; }

details.dropdown[open] .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 200px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-1);
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px) scale(0.98);
  transform-origin: top left;
  transition: opacity var(--transition), visibility var(--transition),
              transform var(--transition);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  padding: 7px var(--space-3);
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--color-text-2);
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  text-align: left;
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
  letter-spacing: var(--tracking-normal);
  font-family: var(--font-sans);
}

.dropdown-item:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}

.dropdown-item.active {
  color: var(--color-text);
  font-weight: 500;
}

.dropdown-item.danger {
  color: oklch(0.55 0.18 25);
}

.dropdown-item.danger:hover {
  background: oklch(0.55 0.18 25 / 0.08);
}

.dropdown-divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-1);
}

.dropdown-label {
  padding: var(--space-1) var(--space-3) 4px;
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-text-3);
}

/* ── Accordion (details / summary) ──────────────────────── */
.accordion {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.accordion details + details {
  border-top: 1px solid var(--color-border);
}

.accordion details > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-4) var(--space-5);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  background: transparent;
  cursor: pointer;
  text-align: left;
  transition: background var(--transition);
  letter-spacing: var(--tracking-normal);
  list-style: none;
  user-select: none;
}

.accordion details > summary::-webkit-details-marker { display: none; }

.accordion details > summary:hover { background: var(--color-surface-2); }

.accordion-icon {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  color: var(--color-text-3);
  transition: transform var(--transition);
}

.accordion details[open] > summary .accordion-icon {
  transform: rotate(180deg);
}

@keyframes accordionIn {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.accordion details[open] > .accordion-body {
  animation: accordionIn var(--transition) var(--ease);
}

.accordion-body {
  padding: 0 var(--space-5) var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-text-2);
  line-height: var(--leading-normal);
}

/* ── Modal (dialog) ──────────────────────────────────────── */
dialog.modal {
  position: fixed;
  top: 50%;
  left: 50%;
  translate: -50% -50%;
  margin: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  width: calc(100% - var(--space-8));
  max-width: 500px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  padding: 0;
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
  transform: scale(0.96) translateY(8px);
  transition: opacity var(--transition-slow), transform var(--transition-slow),
              display var(--transition-slow) allow-discrete,
              overlay var(--transition-slow) allow-discrete;
}

dialog.modal[open] {
  opacity: 1;
  pointer-events: auto;
  transform: scale(1) translateY(0);
}

@starting-style {
  dialog.modal[open] {
    opacity: 0;
    transform: scale(0.96) translateY(8px);
  }
}

dialog.modal::backdrop {
  background: oklch(0 0 0 / 0.35);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  transition: background var(--transition-slow),
              display var(--transition-slow) allow-discrete,
              overlay var(--transition-slow) allow-discrete;
}

@starting-style {
  dialog.modal[open]::backdrop {
    background: oklch(0 0 0 / 0);
  }
}

dialog.modal-sm { max-width: 360px; }
dialog.modal-lg { max-width: 720px; }

.modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  flex-shrink: 0;
}

.modal-title {
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  color: var(--color-text);
  line-height: var(--leading-tight);
}

.modal-subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-2);
  margin-top: var(--space-1);
}

.modal-close {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface-2);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--color-text-3);
  transition: background var(--transition), color var(--transition);
  margin-left: var(--space-4);
  flex-shrink: 0;
}

.modal-close:hover {
  background: var(--color-border);
  color: var(--color-text);
}

.modal-body {
  padding: 0 var(--space-6) var(--space-5);
  overflow-y: auto;
  flex: 1;
  font-size: var(--text-sm);
  color: var(--color-text-2);
  line-height: var(--leading-normal);
}

.modal-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);
  flex-shrink: 0;
  background: var(--color-surface-2);
}

/* ── Loading ─────────────────────────────────────────────── */
@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.35; }
}

@keyframes shimmer {
  from { background-position: -400px 0; }
  to   { background-position: 400px 0; }
}

.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-text);
  border-radius: 50%;
  animation: spin 0.65s linear infinite;
  flex-shrink: 0;
}

.spinner-sm { width: 14px; height: 14px; border-width: 1.5px; }
.spinner-lg { width: 28px; height: 28px; border-width: 2.5px; }

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-surface-2) 25%,
    var(--color-border) 50%,
    var(--color-surface-2) 75%
  );
  background-size: 400px 100%;
  animation: shimmer 1.4s ease infinite;
  border-radius: var(--radius-sm);
  display: block;
}

.skeleton-text { height: 14px; }
.skeleton-text + .skeleton-text { margin-top: var(--space-2); }
.skeleton-text.w-3\/4 { width: 75%; }
.skeleton-text.w-1\/2 { width: 50%; }
.skeleton-text.w-full { width: 100%; }

.skeleton-circle {
  border-radius: 50%;
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.skeleton-card {
  height: 120px;
  border-radius: var(--radius-lg);
}

.loading-dots {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.loading-dots span {
  display: inline-block;
  width: 5px;
  height: 5px;
  background: currentColor;
  border-radius: 50%;
  animation: pulse 1.2s ease-in-out infinite;
}

.loading-dots span:nth-child(2) { animation-delay: 0.2s; }
.loading-dots span:nth-child(3) { animation-delay: 0.4s; }

/* ── Table ───────────────────────────────────────────────── */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

thead th {
  text-align: left;
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-text-3);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface-2);
  white-space: nowrap;
}

thead th:first-child { border-top-left-radius: var(--radius-lg); }
thead th:last-child  { border-top-right-radius: var(--radius-lg); }

tbody td {
  padding: 11px var(--space-4);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-2);
  vertical-align: middle;
}

tbody tr:last-child td { border-bottom: none; }

tbody tr:hover td { background: var(--color-surface-2); }

/* ── Avatar ──────────────────────────────────────────────── */
.avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-2);
  overflow: hidden;
  flex-shrink: 0;
  letter-spacing: 0;
}

.avatar img { width: 100%; height: 100%; object-fit: cover; }
.avatar-sm  { width: 24px; height: 24px; font-size: 10px; }
.avatar-lg  { width: 44px; height: 44px; font-size: var(--text-base); }
.avatar-xl  { width: 60px; height: 60px; font-size: var(--text-lg); }

/* ── Alert / Banner ──────────────────────────────────────── */
.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  font-size: var(--text-sm);
  color: var(--color-text-2);
}

.alert-icon { flex-shrink: 0; margin-top: 1px; }

/* ── Divider with label ──────────────────────────────────── */
.divider {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  color: var(--color-text-3);
  font-size: var(--text-xs);
}

.divider::before,
.divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

/* ── Utilities ───────────────────────────────────────────── */
.w-full    { width: 100%; }
.flex      { display: flex; }
.inline-flex { display: inline-flex; }
.items-center { align-items: center; }
.items-start  { align-items: flex-start; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.flex-1    { flex: 1; }
.flex-wrap { flex-wrap: wrap; }

.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

.mt-1  { margin-top: var(--space-1); }
.mt-2  { margin-top: var(--space-2); }
.mt-3  { margin-top: var(--space-3); }
.mt-4  { margin-top: var(--space-4); }
.mt-6  { margin-top: var(--space-6); }
.mt-8  { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }

.mb-1  { margin-bottom: var(--space-1); }
.mb-2  { margin-bottom: var(--space-2); }
.mb-3  { margin-bottom: var(--space-3); }
.mb-4  { margin-bottom: var(--space-4); }
.mb-6  { margin-bottom: var(--space-6); }
.mb-8  { margin-bottom: var(--space-8); }

.rounded-sm { border-radius: var(--radius-sm); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-full { border-radius: var(--radius-full); }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

.bg-surface   { background: var(--color-surface); }
.bg-surface-2 { background: var(--color-surface-2); }
.border       { border: 1px solid var(--color-border); }

.opacity-50 { opacity: 0.5; }
.cursor-not-allowed { cursor: not-allowed; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ── Focus styles ────────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* ── Scrollbar ───────────────────────────────────────────── */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--color-border-strong);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-3);
}

/* ── Selection ───────────────────────────────────────────── */
::selection {
  background: oklch(from var(--color-accent) l c h / 0.15);
}

/* ── Responsive ──────────────────────────────────────────── */

/* Tablet (≤768px) */
@media (max-width: 768px) {
  /* Typography */
  h1 { font-size: var(--text-3xl); }
  h2 { font-size: var(--text-2xl); }
  h3 { font-size: var(--text-xl); }

  /* Sections */
  .section    { padding-block: var(--space-12); }
  .section-lg { padding-block: var(--space-16); }
  .section-sm { padding-block: var(--space-8); }

  /* Nav — hide links, show hamburger toggle */
  .nav-links { display: none; }

  .nav-inner {
    gap: var(--space-3);
    padding-inline: var(--space-4);
  }

  .nav-hamburger {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--color-text-2);
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
  }

  .nav-hamburger:hover {
    background: var(--color-surface-2);
    color: var(--color-text);
  }

  /* Mobile nav drawer */
  .nav-drawer {
    display: block;
    position: fixed;
    inset: 54px 0 0 0;
    background: color-mix(in oklch, var(--color-bg) 96%, transparent);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--color-border);
    padding: var(--space-4);
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--transition), visibility var(--transition), transform var(--transition);
  }

  .nav-drawer.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-drawer-links {
    list-style: none;
    padding: 0;
    margin: 0 0 var(--space-4);
  }

  .nav-drawer-links li { margin-top: 0; }

  .nav-drawer-links a {
    display: block;
    padding: var(--space-3) var(--space-3);
    font-size: var(--text-base);
    font-weight: 450;
    color: var(--color-text-2);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: background var(--transition), color var(--transition);
  }

  .nav-drawer-links a:hover,
  .nav-drawer-links a.active {
    background: var(--color-surface-2);
    color: var(--color-text);
  }

  .nav-drawer-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-border);
  }

  .nav-drawer-actions .btn {
    width: 100%;
    justify-content: center;
  }
}

/* Mobile (≤640px) */
@media (max-width: 640px) {
  /* Typography */
  h1 { font-size: var(--text-2xl); letter-spacing: -0.02em; }
  h2 { font-size: var(--text-xl); }
  h3 { font-size: var(--text-lg); }

  /* Sections */
  .section    { padding-block: var(--space-10); }
  .section-lg { padding-block: var(--space-12); }
  .section-sm { padding-block: var(--space-6); }

  /* Section header */
  .section-header { margin-bottom: var(--space-8); }

  /* Nav actions — hide on small screens (only hamburger + brand) */
  .nav-actions { display: none; }

  /* Stack on mobile */
  .sm\:stack {
    flex-direction: column;
    align-items: stretch;
  }

  .sm\:stack > * { width: 100%; justify-content: center; }

  /* Full width button on mobile */
  .sm\:w-full { width: 100%; }

  /* Modal */
  dialog.modal {
    width: 100%;
    max-width: 100%;
    max-height: 85vh;
    top: auto;
    bottom: 0;
    left: 0;
    translate: 0 0;
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
    transform: translateY(16px);
  }

  dialog.modal[open] {
    transform: translateY(0);
  }

  @starting-style {
    dialog.modal[open] {
      transform: translateY(16px);
      opacity: 0;
    }
  }

  /* Table — allow horizontal scroll on small screens */
  .table-wrap { border-radius: var(--radius-md); }

  /* Pre — tighten padding */
  pre { padding: var(--space-3) var(--space-4); font-size: var(--text-xs); }

  /* Card footer — stack buttons */
  .card-footer { flex-wrap: wrap; }
}

/* Desktop-only: hide hamburger */
@media (min-width: 769px) {
  .nav-hamburger { display: none; }
  .nav-drawer    { display: none !important; }
}