/* ==========================================================================
   MONO — design tokens + components
   Black, white, and the grays between. Nothing else.
   https://github.com/layogtima/mono
   ========================================================================== */

/* --------------------------------------------------------------------------
   01 — TOKENS
   Scale steps are precomputed (base 16px, ratio 1.25). The customizer
   recomputes them; CSS pow() is deliberately avoided.
   -------------------------------------------------------------------------- */
:root {
  --paper: #ffffff;
  --ink: #0a0a0a;

  --gray-100: #f4f4f4;
  --gray-200: #e4e4e4;
  --gray-300: #d4d4d4;
  --gray-400: #a3a3a3;
  --gray-500: #737373;
  --gray-600: #525252;
  --gray-700: #404040;
  --gray-800: #262626;
  --gray-900: #171717;

  --font-mono: "Space Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --text-base: 1rem;
  --step--2: 0.64rem;
  --step--1: 0.8rem;
  --step-0: 1rem;
  --step-1: 1.25rem;
  --step-2: 1.563rem;
  --step-3: 1.953rem;
  --step-4: 2.441rem;
  --step-5: 3.052rem;
  --step-6: 3.815rem;
  --step-7: 4.768rem;

  --leading: 1.6;
  --leading-tight: 1.1;
  --tracking: 0em;
  --tracking-wide: 0.12em;

  --border-w: 2px;
  --border-w-hairline: 1px;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4rem;
  --space-8: 6rem;

  --measure: 65ch;
}

/* Inversion. One attribute flips the whole site. */
html[data-theme="dark"] {
  --paper: #0a0a0a;
  --ink: #fafafa;

  --gray-100: #171717;
  --gray-200: #262626;
  --gray-300: #404040;
  --gray-400: #525252;
  --gray-500: #737373;
  --gray-600: #a3a3a3;
  --gray-700: #d4d4d4;
  --gray-800: #e4e4e4;
  --gray-900: #f4f4f4;
}

/* --------------------------------------------------------------------------
   02 — BASE
   -------------------------------------------------------------------------- */
body {
  font-family: var(--font-mono);
  font-size: var(--step-0);
  line-height: var(--leading);
  letter-spacing: var(--tracking);
  background-color: var(--paper);
  color: var(--ink);
}

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

:focus-visible {
  outline: var(--border-w) solid var(--ink);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* --------------------------------------------------------------------------
   03 — TYPOGRAPHIC UTILITIES
   -------------------------------------------------------------------------- */

/* Oversized editorial display type; fluid so heroes never overflow. */
.display {
  font-size: clamp(var(--step-5), 9vw, var(--step-7));
  line-height: var(--leading-tight);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.display-xl {
  font-size: clamp(var(--step-6), 14vw, 8.5rem);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* The MONO signature: a superscript tail on the page <h1>. Use once per page. */
.sup {
  font-size: 0.25em;
  vertical-align: super;
  letter-spacing: var(--tracking-wide);
}

/* Numbered section labels: 01 — TYPE SCALE */
.meta {
  font-size: var(--step--1);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--gray-600);
}

.measure {
  max-width: var(--measure);
}

/* Hairline rule */
.rule {
  border: 0;
  border-top: var(--border-w-hairline) solid var(--ink);
}

/* Subtle baseline-grid texture for heroes */
.baseline-grid {
  background-image: repeating-linear-gradient(
    to bottom,
    var(--gray-200) 0,
    var(--gray-200) 1px,
    transparent 1px,
    transparent var(--space-5)
  );
}

/* --------------------------------------------------------------------------
   04 — BUTTONS
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border: var(--border-w) solid var(--ink);
  background-color: var(--ink);
  color: var(--paper);
  font-family: inherit;
  font-size: var(--step--1);
  font-weight: 700;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 150ms ease, color 150ms ease;
}

.btn:hover {
  background-color: var(--paper);
  color: var(--ink);
}

.btn-secondary {
  background-color: transparent;
  color: var(--ink);
}

.btn-secondary:hover {
  background-color: var(--ink);
  color: var(--paper);
}

.btn-ghost {
  border-color: transparent;
  background-color: transparent;
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: var(--border-w);
}

.btn-ghost:hover {
  background-color: var(--gray-100);
}

.btn-sm {
  padding: var(--space-1) var(--space-3);
  font-size: var(--step--2);
}

.btn-lg {
  padding: var(--space-3) var(--space-6);
  font-size: var(--step-0);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  border-color: var(--gray-400);
  background-color: var(--gray-200);
  color: var(--gray-500);
  cursor: not-allowed;
}

.btn-secondary:disabled {
  background-color: transparent;
}

/* Loading: animated ellipsis, no spinner SVG needed. */
.btn-loading::after {
  content: "";
  animation: mono-ellipsis 1.2s steps(4) infinite;
}

@keyframes mono-ellipsis {
  0%   { content: ""; }
  25%  { content: "."; }
  50%  { content: ".."; }
  75%  { content: "..."; }
}

/* --------------------------------------------------------------------------
   05 — TEXT FIELDS
   -------------------------------------------------------------------------- */
.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.label {
  font-size: var(--step--1);
  font-weight: 700;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.input {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: var(--border-w) solid var(--ink);
  background-color: var(--paper);
  color: var(--ink);
  font-family: inherit;
  font-size: var(--step-0);
  line-height: var(--leading);
}

.input::placeholder {
  color: var(--gray-500);
}

.input:disabled {
  border-color: var(--gray-400);
  background-color: var(--gray-100);
  color: var(--gray-500);
  cursor: not-allowed;
}

.input[aria-invalid="true"],
.input-error {
  border-style: dashed;
}

.hint {
  font-size: var(--step--1);
  color: var(--gray-600);
}

.error-text {
  font-size: var(--step--1);
  font-weight: 700;
}

.error-text::before {
  content: "× ";
}

.success-text {
  font-size: var(--step--1);
  font-weight: 700;
}

.success-text::before {
  content: "✓ ";
}

/* --------------------------------------------------------------------------
   06 — SELECT
   Wrapper + ::after CSS triangle keeps the marker monochrome and
   invert-safe (no hardcoded SVG fill).
   -------------------------------------------------------------------------- */
.select {
  position: relative;
  display: block;
}

.select > select {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  padding: var(--space-2) var(--space-6) var(--space-2) var(--space-3);
  border: var(--border-w) solid var(--ink);
  background-color: var(--paper);
  color: var(--ink);
  font-family: inherit;
  font-size: var(--step-0);
  line-height: var(--leading);
  cursor: pointer;
}

.select::after {
  content: "";
  position: absolute;
  right: var(--space-3);
  top: 50%;
  transform: translateY(-25%);
  border-left: 0.4em solid transparent;
  border-right: 0.4em solid transparent;
  border-top: 0.5em solid var(--ink);
  pointer-events: none;
}

.select > select:disabled {
  border-color: var(--gray-400);
  background-color: var(--gray-100);
  color: var(--gray-500);
  cursor: not-allowed;
}

/* --------------------------------------------------------------------------
   07 — CHECKBOX, RADIO, SWITCH
   -------------------------------------------------------------------------- */
.choice {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  font-size: var(--step-0);
}

.check,
.radio {
  appearance: none;
  -webkit-appearance: none;
  width: 1.25em;
  height: 1.25em;
  flex-shrink: 0;
  border: var(--border-w) solid var(--ink);
  background-color: var(--paper);
  cursor: pointer;
  display: inline-grid;
  place-content: center;
}

.radio {
  border-radius: 50%;
}

.check::before,
.radio::before {
  content: "";
  width: 0.55em;
  height: 0.55em;
  background-color: var(--ink);
  transform: scale(0);
  transition: transform 100ms ease;
}

.radio::before {
  border-radius: 50%;
}

.check:checked::before,
.radio:checked::before {
  transform: scale(1);
}

.check:disabled,
.radio:disabled {
  border-color: var(--gray-400);
  background-color: var(--gray-100);
  cursor: not-allowed;
}

.check:disabled::before,
.radio:disabled::before {
  background-color: var(--gray-400);
}

/* Toggle switch: a checkbox under the hood. */
.switch {
  appearance: none;
  -webkit-appearance: none;
  position: relative;
  width: 3em;
  height: 1.5em;
  flex-shrink: 0;
  border: var(--border-w) solid var(--ink);
  background-color: var(--paper);
  cursor: pointer;
}

.switch::before {
  content: "";
  position: absolute;
  top: 0.125em;
  left: 0.125em;
  width: 1em;
  height: 1em;
  background-color: var(--ink);
  transition: transform 150ms ease;
}

.switch:checked {
  background-color: var(--ink);
}

.switch:checked::before {
  background-color: var(--paper);
  transform: translateX(1.5em);
}

.switch:disabled {
  border-color: var(--gray-400);
  cursor: not-allowed;
}

.switch:disabled::before {
  background-color: var(--gray-400);
}

/* --------------------------------------------------------------------------
   08 — RANGE
   -------------------------------------------------------------------------- */
.range {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  height: 1.25em;
  background: transparent;
  cursor: pointer;
}

.range::-webkit-slider-runnable-track {
  height: var(--border-w);
  background-color: var(--ink);
}

.range::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 1em;
  height: 1em;
  margin-top: calc((1em - var(--border-w)) / -2);
  background-color: var(--ink);
  border: none;
}

.range::-moz-range-track {
  height: var(--border-w);
  background-color: var(--ink);
}

.range::-moz-range-thumb {
  width: 1em;
  height: 1em;
  background-color: var(--ink);
  border: none;
  border-radius: 0;
}

/* --------------------------------------------------------------------------
   09 — FILE INPUT
   -------------------------------------------------------------------------- */
.file {
  width: 100%;
  font-size: var(--step--1);
  color: var(--gray-600);
}

.file::file-selector-button {
  margin-right: var(--space-3);
  padding: var(--space-2) var(--space-4);
  border: var(--border-w) solid var(--ink);
  background-color: var(--ink);
  color: var(--paper);
  font-family: inherit;
  font-size: var(--step--1);
  font-weight: 700;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  cursor: pointer;
}

.file::file-selector-button:hover {
  background-color: var(--paper);
  color: var(--ink);
}

/* --------------------------------------------------------------------------
   10 — TABLE
   -------------------------------------------------------------------------- */
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--step--1);
  text-align: left;
}

.table caption {
  text-align: left;
  font-size: var(--step--1);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--gray-600);
  padding-bottom: var(--space-2);
}

.table th {
  border-bottom: var(--border-w) solid var(--ink);
  padding: var(--space-2) var(--space-3);
  font-weight: 700;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.table td {
  border-bottom: var(--border-w-hairline) solid var(--gray-300);
  padding: var(--space-2) var(--space-3);
}

.table-striped tbody tr:nth-child(odd) td {
  background-color: var(--gray-100);
}

.table-dense th,
.table-dense td {
  padding: var(--space-1) var(--space-2);
}

/* --------------------------------------------------------------------------
   11 — TABS
   -------------------------------------------------------------------------- */
.tabs {
  display: flex;
  border-bottom: var(--border-w) solid var(--ink);
}

.tab {
  padding: var(--space-2) var(--space-4);
  border: none;
  background: transparent;
  color: var(--gray-600);
  font-family: inherit;
  font-size: var(--step--1);
  font-weight: 700;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  cursor: pointer;
}

.tab[aria-selected="true"] {
  background-color: var(--ink);
  color: var(--paper);
}

.tabpanel {
  padding: var(--space-4) 0;
}

/* --------------------------------------------------------------------------
   12 — ACCORDION (native <details>)
   -------------------------------------------------------------------------- */
.accordion {
  border-top: var(--border-w) solid var(--ink);
}

.accordion:last-of-type {
  border-bottom: var(--border-w) solid var(--ink);
}

.accordion > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}

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

.accordion > summary::after {
  content: "+";
  font-size: var(--step-1);
  line-height: 1;
}

.accordion[open] > summary::after {
  content: "−";
}

.accordion > :not(summary) {
  padding-bottom: var(--space-3);
}

/* --------------------------------------------------------------------------
   13 — MODAL (native <dialog>)
   -------------------------------------------------------------------------- */
.modal {
  border: var(--border-w) solid var(--ink);
  background-color: var(--paper);
  color: var(--ink);
  padding: var(--space-5);
  max-width: min(32rem, calc(100vw - var(--space-5)));
  margin: auto;
}

.modal::backdrop {
  background-color: rgba(0, 0, 0, 0.55);
}

html[data-theme="dark"] .modal::backdrop {
  background-color: rgba(0, 0, 0, 0.75);
}

/* --------------------------------------------------------------------------
   14 — DROPDOWN MENU
   -------------------------------------------------------------------------- */
.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + var(--space-1));
  left: 0;
  min-width: 12rem;
  border: var(--border-w) solid var(--ink);
  background-color: var(--paper);
  z-index: 30;
  margin: 0;
  padding: 0;
  list-style: none;
}

.dropdown-menu a,
.dropdown-menu button {
  display: block;
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: none;
  background: transparent;
  color: var(--ink);
  font-family: inherit;
  font-size: var(--step--1);
  text-align: left;
  text-decoration: none;
  cursor: pointer;
}

.dropdown-menu a:hover,
.dropdown-menu button:hover {
  background-color: var(--ink);
  color: var(--paper);
}

/* --------------------------------------------------------------------------
   15 — TOOLTIP
   -------------------------------------------------------------------------- */
[data-tooltip] {
  position: relative;
}

[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + var(--space-2));
  left: 50%;
  transform: translateX(-50%);
  padding: var(--space-1) var(--space-2);
  background-color: var(--ink);
  color: var(--paper);
  font-size: var(--step--2);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 150ms ease;
  z-index: 40;
}

[data-tooltip]:hover::after,
[data-tooltip]:focus-visible::after {
  opacity: 1;
}

/* --------------------------------------------------------------------------
   16 — TOAST
   -------------------------------------------------------------------------- */
.toast-region {
  position: fixed;
  bottom: var(--space-4);
  right: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  z-index: 60;
}

.toast {
  padding: var(--space-3) var(--space-4);
  border: var(--border-w) solid var(--paper);
  background-color: var(--ink);
  color: var(--paper);
  font-size: var(--step--1);
  max-width: 24rem;
  animation: mono-toast-in 200ms ease;
}

@keyframes mono-toast-in {
  from {
    opacity: 0;
    transform: translateY(var(--space-2));
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --------------------------------------------------------------------------
   17 — CODE BLOCKS (component snippets)
   -------------------------------------------------------------------------- */
.code-block {
  position: relative;
  border: var(--border-w-hairline) solid var(--gray-400);
  background-color: var(--gray-100);
  padding: var(--space-4);
  overflow-x: auto;
}

.code-block pre {
  font-size: var(--step--1);
  line-height: 1.5;
}

.code-block .copy-btn {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
}