/* ============================================================
   MERIDIAN DESIGN SYSTEM v1.0
   A Stripe-grade UI system. Professional blue, no purple,
   no gradients, no glassmorphism, no glow blobs.

   HOW TO USE (read this, AI):
   - Every color, size, radius, shadow comes from a token below.
     Never hardcode hex values or px sizes in components.
   - Base unit is 4px. All spacing uses --space-* tokens.
   - Two CTA colors only: --color-action (blue) for primary
     actions, --color-ink (navy) for the dark button variant.
   - Radius is quiet: 6px controls, 8px cards. Never 16px+.
   - Shadows are cool-tinted and layered, never soft-blurry.
   - One accent per view. If everything is blue, nothing is.
   ============================================================ */

/* ------------------------------------------------------------
   1. TOKENS
   ------------------------------------------------------------ */
:root {
  /* --- Color: neutrals (cool, blue-cast, like Stripe) --- */
  --color-ink:          #0A2540;  /* headings, dark buttons */
  --color-ink-hover:    #14385C;
  --color-text:         #354356;  /* body text */
  --color-text-muted:   #687385;  /* secondary text, hints */
  --color-text-faint:   #8792A2;  /* placeholders, disabled */

  --color-bg:           #FFFFFF;
  --color-bg-subtle:    #F6F9FC;  /* alternate sections, table heads */
  --color-bg-inset:     #EFF3F8;  /* wells, code, keyboard keys */

  --color-border:       #E3E8EE;  /* default hairline */
  --color-border-strong:#C9D2DC;  /* inputs at rest */

  /* --- Color: action blue (replaces Stripe purple) --- */
  --color-action:        #0A5AD6;
  --color-action-hover:  #0849AE;
  --color-action-active: #063C8F;
  --color-action-tint:   #EDF3FE;  /* selected rows, active tabs bg */
  --color-action-ring:   rgba(10, 90, 214, 0.16);

  /* --- Color: semantic --- */
  --color-success:      #1C7A43;
  --color-success-bg:   #E5F6EC;
  --color-warning:      #A85B00;
  --color-warning-bg:   #FCF1DE;
  --color-danger:       #C0123C;
  --color-danger-hover: #A00E32;
  --color-danger-bg:    #FDEBEF;
  --color-danger-ring:  rgba(192, 18, 60, 0.16);

  /* --- Typography --- */
  --font-sans: "Inter", -apple-system, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono",
               Menlo, Consolas, monospace;

  --text-xs:   0.8125rem;  /* 13px — captions, badges, table meta */
  --text-sm:   0.875rem;   /* 14px — UI default: buttons, inputs, tables */
  --text-base: 1rem;       /* 16px — long-form body */
  --text-lg:   1.125rem;   /* 18px — lead paragraphs */
  --text-xl:   1.25rem;    /* 20px — card titles */
  --text-2xl:  1.5rem;     /* 24px — section titles */
  --text-3xl:  2rem;       /* 32px — page titles */
  --text-4xl:  2.5rem;     /* 40px — hero */
  --text-5xl:  3.5rem;     /* 56px — marketing hero */

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

  --tracking-tight: -0.02em;  /* headings ≥ 24px */
  --tracking-snug:  -0.01em;  /* UI text */

  /* --- Spacing (4px base) --- */
  --space-1:  0.25rem;   /*  4px */
  --space-2:  0.5rem;    /*  8px */
  --space-3:  0.75rem;   /* 12px */
  --space-4:  1rem;      /* 16px */
  --space-5:  1.25rem;   /* 20px */
  --space-6:  1.5rem;    /* 24px */
  --space-8:  2rem;      /* 32px */
  --space-10: 2.5rem;    /* 40px */
  --space-12: 3rem;      /* 48px */
  --space-16: 4rem;      /* 64px */
  --space-20: 5rem;      /* 80px */
  --space-24: 6rem;      /* 96px — marketing section rhythm */

  /* --- Radius --- */
  --radius-sm:   4px;   /* badges, checkboxes, code */
  --radius-md:   6px;   /* buttons, inputs, selects */
  --radius-lg:   8px;   /* cards, alerts, modals */
  --radius-full: 999px; /* pills, avatars, toggles */

  /* --- Shadows (cool-tinted, layered — never one soft blur) --- */
  --shadow-xs: 0 1px 1px rgba(10, 37, 64, 0.06);
  --shadow-sm: 0 1px 1px rgba(0, 0, 0, 0.04),
               0 2px 4px rgba(50, 50, 93, 0.08);
  --shadow-md: 0 2px 5px -1px rgba(50, 50, 93, 0.14),
               0 1px 3px -1px rgba(0, 0, 0, 0.10);
  --shadow-lg: 0 13px 27px -5px rgba(50, 50, 93, 0.16),
               0 8px 16px -8px rgba(0, 0, 0, 0.10);
  --shadow-focus: 0 0 0 4px var(--color-action-ring);

  /* --- Motion --- */
  --ease: cubic-bezier(0.2, 0, 0, 1);
  --duration-fast: 120ms;
  --duration-base: 180ms;

  /* --- Layout --- */
  --container-max: 1080px;
  --container-pad: var(--space-6);

  /* --- Z-index --- */
  --z-dropdown: 100;
  --z-sticky:   200;
  --z-overlay:  300;
  --z-modal:    400;
  --z-toast:    500;
}

/* ------------------------------------------------------------
   1b. DARK MODE TOKEN OVERRIDE
   Action blue and semantic colors stay; neutrals/surfaces flip
   so .card, .field, .input, .table th, .stat__value, .alert
   all read correctly on a dark background. The .dark class is
   toggled on <html> by components/Navbar.js.
   ------------------------------------------------------------ */
.dark {
  --color-ink:           #E6ECF5;  /* headings on dark */
  --color-ink-hover:     #FFFFFF;
  --color-text:          #C7D0DE;  /* body text on dark */
  --color-text-muted:    #8794A8;
  --color-text-faint:    #5E6B80;

  --color-bg:            #0B1220;  /* page bg (slate-950-ish) */
  --color-bg-subtle:     #111A2E;  /* table heads, wells, alternate sections */
  --color-bg-inset:      #0F172A;  /* code blocks, keyboard keys */

  --color-border:        #1E2A40;  /* default hairline on dark */
  --color-border-strong: #2C3A55;  /* inputs at rest on dark */

  --color-action-tint:   #0F2547;  /* selected rows on dark — darker blue tint */

  /* Cool-tinted shadows don't read well on dark; keep --shadow-sm for
     depth on .card but reduce opacity so the dark surface still feels
     flat-first. The :focus ring stays full-strength. */
  --shadow-xs: 0 1px 1px rgba(0, 0, 0, 0.20);
  --shadow-sm: 0 1px 1px rgba(0, 0, 0, 0.30),
               0 2px 4px rgba(0, 0, 0, 0.18);
  --shadow-md: 0 2px 5px -1px rgba(0, 0, 0, 0.40),
               0 1px 3px -1px rgba(0, 0, 0, 0.30);
  --shadow-lg: 0 13px 27px -5px rgba(0, 0, 0, 0.50),
               0 8px 16px -8px rgba(0, 0, 0, 0.40);
}

/* ------------------------------------------------------------
   2. BASE
   ------------------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  letter-spacing: var(--tracking-snug);
  color: var(--color-text);
  background: var(--color-bg);
  font-feature-settings: "cv05", "cv11", "ss01";
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-4);
  color: var(--color-ink);
  line-height: var(--leading-tight);
  font-weight: 600;
}
h1 { font-size: var(--text-4xl); letter-spacing: var(--tracking-tight); font-weight: 700; }
h2 { font-size: var(--text-3xl); letter-spacing: var(--tracking-tight); font-weight: 700; }
h3 { font-size: var(--text-2xl); letter-spacing: var(--tracking-tight); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-sm); text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-text-muted); }

p { margin: 0 0 var(--space-4); }

a {
  color: var(--color-action);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease);
}
/* Note: a:hover underline is intentionally OFF so the Meridian rules
   don't break Next.js Link components. The Stripe-grade hover uses a
   color shift, not an underline. If a real link needs underline (e.g.
   inline body copy), apply it explicitly with className="underline". */
a:hover { color: var(--color-action-hover); }

code, kbd {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--color-bg-inset);
  border-radius: var(--radius-sm);
  padding: 0.15em 0.4em;
  color: var(--color-ink);
}
kbd { border: 1px solid var(--color-border-strong); border-bottom-width: 2px; }

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

::selection { background: var(--color-action-tint); color: var(--color-ink); }

/* Visible keyboard focus, everywhere */
:focus-visible {
  outline: 2px solid var(--color-action);
  outline-offset: 2px;
}

/* ------------------------------------------------------------
   3. LAYOUT UTILITIES
   ------------------------------------------------------------ */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.section { padding-block: var(--space-20); }
.section--subtle { background: var(--color-bg-subtle); }
.section--dark { background: var(--color-ink); }
.section--dark h1, .section--dark h2, .section--dark h3 { color: #fff; }
.section--dark p { color: #ADBDCC; }

.stack > * + * { margin-top: var(--space-4); }
.stack--tight > * + * { margin-top: var(--space-2); }
.stack--loose > * + * { margin-top: var(--space-8); }

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

.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); }
@media (max-width: 900px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .section { padding-block: var(--space-12); }
}

/* Eyebrow label above section titles */
.eyebrow {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-action);
  letter-spacing: 0.02em;
  margin-bottom: var(--space-3);
}

.text-muted { color: var(--color-text-muted); }
.text-small { font-size: var(--text-sm); }

/* ------------------------------------------------------------
   4. BUTTONS
   Heights: sm 32 / md 36 / lg 44. Radius 6. Weight 600.
   ------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: 36px;
  padding: 0 var(--space-4);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: var(--tracking-snug);
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
  text-decoration: none;
  transition: background-color var(--duration-fast) var(--ease),
              border-color var(--duration-fast) var(--ease),
              box-shadow var(--duration-fast) var(--ease),
              color var(--duration-fast) var(--ease);
}
.btn:hover { text-decoration: none; }
.btn:disabled, .btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}
.btn:focus-visible { outline: none; box-shadow: var(--shadow-focus); }

/* Primary — the blue CTA */
.btn--primary {
  background: var(--color-action);
  color: #fff;
  box-shadow: var(--shadow-xs), inset 0 1px 0 rgba(255, 255, 255, 0.12);
}
.btn--primary:hover  { background: var(--color-action-hover); }
.btn--primary:active { background: var(--color-action-active); }

/* Dark — navy CTA for marketing pages / dark sections */
.btn--dark {
  background: var(--color-ink);
  color: #fff;
  box-shadow: var(--shadow-xs), inset 0 1px 0 rgba(255, 255, 255, 0.10);
}
.btn--dark:hover { background: var(--color-ink-hover); }

/* Secondary — white with hairline border */
.btn--secondary {
  background: var(--color-bg);
  color: var(--color-ink);
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-xs);
}
.btn--secondary:hover { border-color: #A3B1C2; background: var(--color-bg-subtle); }

/* Ghost — toolbars, table rows */
.btn--ghost {
  background: transparent;
  color: var(--color-text);
}
.btn--ghost:hover { background: var(--color-bg-inset); color: var(--color-ink); }

/* Destructive */
.btn--danger {
  background: var(--color-danger);
  color: #fff;
  box-shadow: var(--shadow-xs);
}
.btn--danger:hover { background: var(--color-danger-hover); }
.btn--danger:focus-visible { box-shadow: 0 0 0 4px var(--color-danger-ring); }

/* On dark sections: inverted secondary */
.btn--inverse {
  background: #fff;
  color: var(--color-ink);
  box-shadow: var(--shadow-sm);
}
.btn--inverse:hover { background: #EDF3FE; }

/* Sizes */
.btn--sm { height: 32px; padding: 0 var(--space-3); font-size: var(--text-xs); }
.btn--lg { height: 44px; padding: 0 var(--space-6); font-size: var(--text-base); border-radius: var(--radius-md); }

/* Icon-only */
.btn--icon { width: 36px; padding: 0; }
.btn--icon.btn--sm { width: 32px; }

/* Arrow affordance for text links styled as CTAs */
.link-cta {
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-action);
  white-space: nowrap;
}
.link-cta::after { content: "\2192"; margin-left: 0.35em; transition: margin var(--duration-fast) var(--ease); }
.link-cta:hover { text-decoration: none; }
.link-cta:hover::after { margin-left: 0.55em; }

/* ------------------------------------------------------------
   5. FORMS
   Field height 36px, 1px border, 4px blue ring on focus.
   Always pair inputs with .field for label + hint spacing.
   ------------------------------------------------------------ */
.field { display: flex; flex-direction: column; gap: var(--space-2); }

.field__label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-ink);
}
.field__label .optional {
  font-weight: 400;
  color: var(--color-text-faint);
  margin-left: var(--space-1);
}

.field__hint {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin: 0;
}

.field__error {
  font-size: var(--text-xs);
  color: var(--color-danger);
  font-weight: 500;
  margin: 0;
}

.input,
.select,
.textarea {
  width: 100%;
  height: 36px;
  padding: 0 var(--space-3);
  font-family: inherit;
  font-size: var(--text-sm);
  color: var(--color-ink);
  background: var(--color-bg);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xs);
  transition: border-color var(--duration-fast) var(--ease),
              box-shadow var(--duration-fast) var(--ease);
}
.input::placeholder, .textarea::placeholder { color: var(--color-text-faint); }
.input:hover, .select:hover, .textarea:hover { border-color: #A3B1C2; }
.input:focus, .select:focus, .textarea:focus {
  outline: none;
  border-color: var(--color-action);
  box-shadow: var(--shadow-focus);
}
.input:disabled, .select:disabled, .textarea:disabled {
  background: var(--color-bg-inset);
  color: var(--color-text-faint);
  cursor: not-allowed;
  box-shadow: none;
}

/* Error state: add .is-invalid to the control */
.is-invalid { border-color: var(--color-danger) !important; }
.is-invalid:focus { box-shadow: 0 0 0 4px var(--color-danger-ring) !important; }

.textarea { height: auto; min-height: 96px; padding: var(--space-2) var(--space-3); line-height: var(--leading-snug); resize: vertical; }

.select {
  appearance: none;
  padding-right: var(--space-8);
  background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%23687385' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
}

/* Input group: prefix / suffix (e.g. $ __ USD) */
.input-group {
  display: flex;
  align-items: stretch;
  width: 100%;
}
.input-group .input { border-radius: 0; box-shadow: none; }
.input-group > :first-child { border-radius: var(--radius-md) 0 0 var(--radius-md); }
.input-group > :last-child  { border-radius: 0 var(--radius-md) var(--radius-md) 0; }
.input-group .input:not(:first-child) { border-left: none; }
.input-group__addon {
  display: flex;
  align-items: center;
  padding: 0 var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border-strong);
}
.input-group__addon:first-child { border-right: none; }
.input-group__addon:last-child  { border-left: none; }

/* Checkbox + radio */
.check {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text);
  cursor: pointer;
}
.check input[type="checkbox"],
.check input[type="radio"] {
  appearance: none;
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  margin: 2px 0 0;
  border: 1px solid var(--color-border-strong);
  background: var(--color-bg);
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease),
              border-color var(--duration-fast) var(--ease),
              box-shadow var(--duration-fast) var(--ease);
}
.check input[type="checkbox"] { border-radius: var(--radius-sm); }
.check input[type="radio"]    { border-radius: var(--radius-full); }
.check input:hover { border-color: #A3B1C2; }
.check input:focus-visible { outline: none; box-shadow: var(--shadow-focus); }
.check input:checked {
  background: var(--color-action);
  border-color: var(--color-action);
}
.check input[type="checkbox"]:checked {
  background-image: url("data:image/svg+xml,%3Csvg width='10' height='8' viewBox='0 0 10 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 4l2.5 2.5L9 1' stroke='white' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
}
.check input[type="radio"]:checked {
  background: var(--color-bg);
  border-width: 5px;
}
.check__text strong { display: block; color: var(--color-ink); font-weight: 500; }
.check__text small { color: var(--color-text-muted); font-size: var(--text-xs); }

/* Toggle switch */
.toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  cursor: pointer;
}
.toggle input {
  appearance: none;
  width: 36px;
  height: 20px;
  margin: 0;
  border-radius: var(--radius-full);
  background: var(--color-border-strong);
  position: relative;
  cursor: pointer;
  transition: background-color var(--duration-base) var(--ease);
}
.toggle input::after {
  content: "";
  position: absolute;
  top: 2px; left: 2px;
  width: 16px; height: 16px;
  border-radius: var(--radius-full);
  background: #fff;
  box-shadow: var(--shadow-sm);
  transition: transform var(--duration-base) var(--ease);
}
.toggle input:checked { background: var(--color-action); }
.toggle input:checked::after { transform: translateX(16px); }
.toggle input:focus-visible { outline: none; box-shadow: var(--shadow-focus); }

/* Fieldset rhythm inside forms */
.form { display: flex; flex-direction: column; gap: var(--space-5); }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); }
@media (max-width: 600px) { .form__row { grid-template-columns: 1fr; } }
.form__actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  padding-top: var(--space-2);
}

/* ------------------------------------------------------------
   6. CARDS
   ------------------------------------------------------------ */
.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
.card__body { padding: var(--space-6); }
.card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--color-border);
}
.card__header h4 { margin: 0; font-size: var(--text-base); }
.card__footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-subtle);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

/* Clickable card */
.card--interactive {
  transition: box-shadow var(--duration-base) var(--ease),
              border-color var(--duration-base) var(--ease);
  cursor: pointer;
}
.card--interactive:hover {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-md);
}

/* Stat / metric card */
.stat { padding: var(--space-5) var(--space-6); }
.stat__label {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}
.stat__value {
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
  color: var(--color-ink);
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}
.stat__delta { font-size: var(--text-xs); font-weight: 600; margin-top: var(--space-2); }
.stat__delta--up   { color: var(--color-success); }
.stat__delta--down { color: var(--color-danger); }

/* ------------------------------------------------------------
   7. BADGES & PILLS
   ------------------------------------------------------------ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  height: 20px;
  padding: 0 var(--space-2);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 500;
  line-height: 1;
  white-space: nowrap;
}
.badge--neutral { background: var(--color-bg-inset); color: var(--color-text); }
.badge--blue    { background: var(--color-action-tint); color: var(--color-action-hover); }
.badge--success { background: var(--color-success-bg); color: var(--color-success); }
.badge--warning { background: var(--color-warning-bg); color: var(--color-warning); }
.badge--danger  { background: var(--color-danger-bg); color: var(--color-danger); }

/* Status dot inside a badge or standalone */
.dot {
  width: 6px; height: 6px;
  border-radius: var(--radius-full);
  background: currentColor;
  display: inline-block;
}

/* ------------------------------------------------------------
   8. TABLES
   ------------------------------------------------------------ */
.table-wrap {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  background: var(--color-bg);
  box-shadow: var(--shadow-xs);
}
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}
.table th {
  text-align: left;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  background: var(--color-bg-subtle);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}
.table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
  vertical-align: middle;
}
.table tr:last-child td { border-bottom: none; }
.table tbody tr { transition: background-color var(--duration-fast) var(--ease); }
.table tbody tr:hover { background: var(--color-bg-subtle); }
.table .num { text-align: right; font-variant-numeric: tabular-nums; }
.table .cell-strong { color: var(--color-ink); font-weight: 500; }

/* ------------------------------------------------------------
   9. ALERTS
   ------------------------------------------------------------ */
.alert {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 1px solid;
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
}
.alert__title { font-weight: 600; color: var(--color-ink); display: block; margin-bottom: 2px; }
.alert--info    { background: var(--color-action-tint);  border-color: #C6DBFA; }
.alert--success { background: var(--color-success-bg);   border-color: #BCE5CB; }
.alert--warning { background: var(--color-warning-bg);   border-color: #F2DBB4; }
.alert--danger  { background: var(--color-danger-bg);    border-color: #F5C3CF; }
.alert p { margin: 0; }

/* ------------------------------------------------------------
   10. TABS
   ------------------------------------------------------------ */
.tabs {
  display: flex;
  gap: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}
.tab {
  appearance: none;
  background: none;
  border: none;
  padding: var(--space-3) 0;
  margin-bottom: -1px;
  font-family: inherit;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color var(--duration-fast) var(--ease);
}
.tab:hover { color: var(--color-ink); }
.tab.is-active {
  color: var(--color-action);
  border-bottom-color: var(--color-action);
}

/* ------------------------------------------------------------
   11. NAVIGATION
   ------------------------------------------------------------ */
.navbar {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}
.navbar__inner {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  height: 60px;
}
.navbar__brand {
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-ink);
  letter-spacing: var(--tracking-tight);
}
.navbar__brand:hover { text-decoration: none; color: var(--color-ink); }
.navbar__links {
  display: flex;
  gap: var(--space-6);
  margin-right: auto;
}
.navbar__links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
}
.navbar__links a:hover { color: var(--color-ink); text-decoration: none; }
@media (max-width: 700px) { .navbar__links { display: none; } }

/* ------------------------------------------------------------
   12. MODAL (structure — toggle .is-open with JS)
   ------------------------------------------------------------ */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  background: rgba(10, 37, 64, 0.45);
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: var(--space-16) var(--space-4);
}
.modal-overlay.is-open { display: flex; }
.modal {
  width: 100%;
  max-width: 480px;
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-modal);
}
.modal__header { padding: var(--space-5) var(--space-6) 0; }
.modal__header h4 { margin: 0; }
.modal__body { padding: var(--space-4) var(--space-6); }
.modal__footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
}

/* ------------------------------------------------------------
   13. MISC: avatar, tooltip, code block, footer
   ------------------------------------------------------------ */
.avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px; height: 32px;
  border-radius: var(--radius-full);
  background: var(--color-action-tint);
  color: var(--color-action-hover);
  font-size: var(--text-xs);
  font-weight: 600;
  flex-shrink: 0;
}
.avatar--sm { width: 24px; height: 24px; font-size: 11px; }

[data-tooltip] { position: relative; }
[data-tooltip]:hover::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-ink);
  color: #fff;
  font-size: var(--text-xs);
  font-weight: 500;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  z-index: var(--z-dropdown);
  pointer-events: none;
}

.code-block {
  background: var(--color-ink);
  color: #C9D8E8;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.7;
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  overflow-x: auto;
}
.code-block .tok-k { color: #7DA9E8; }   /* keyword  */
.code-block .tok-s { color: #7FD1A7; }   /* string   */
.code-block .tok-c { color: #5B7690; }   /* comment  */

.footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-10);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.footer a { color: var(--color-text-muted); }
.footer a:hover { color: var(--color-ink); }

/* ------------------------------------------------------------
   14. ACCESSIBILITY
   ------------------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

.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;
}