/* =============================================================================
   Design Kit — tokens & components (mobile-first)
   ============================================================================= */

:root {
  /* --- Colors --- */
  --color-bg-main: #efefef;
  --color-bg-block: #ffffff;
  --color-accent: #000912;
  --color-text-primary: #000912;
  --color-text-secondary: rgba(0, 9, 18, 0.6);

  /* Derived (same palette, no extra hues) */
  --color-accent-pressed: #1a2229;
  --color-accent-muted: rgba(0, 9, 18, 0.12);
  --color-border-subtle: rgba(0, 9, 18, 0.15);
  --color-on-accent: #ffffff;
  --color-btn-primary-disabled-bg: rgba(0, 9, 18, 0.25);
  --color-btn-primary-disabled-text: rgba(255, 255, 255, 0.75);
  --color-btn-secondary-pressed-bg: #f2f2f2;
  --color-btn-secondary-disabled-text: rgba(0, 9, 18, 0.35);

  /* --- Typography --- */
  --font-sans: "SF Pro Text", "SF Pro Display", -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --text-h1: clamp(1.5rem, 4vw + 0.5rem, 1.75rem);
  --text-h2: clamp(1.25rem, 2.5vw + 0.5rem, 1.5rem);
  --text-h3: 1.125rem;
  --text-h4: 1rem;
  --text-body: 1rem;
  --text-caption: 0.875rem;
  --text-small: 0.8125rem;
  --line-tight: 1.25;
  --line-body: 1.5;
  --line-relaxed: 1.6;

  /* --- Spacing (8px grid) --- */
  --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;

  /* --- Radius --- */
  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1.25rem;
  /* Кнопки: помірне скруглення (rounded rect), не capsule — як у UI kit */
  --radius-btn: 0.75rem;
  --radius-pill: 624.9375rem;

  /* --- Layout --- */
  --container-padding: var(--space-5);
  --container-max: 42rem;
  --touch-min: 2.75rem;

  /* --- Motion --- */
  --transition-fast: 150ms ease;

  /* --- Shadows (minimal) --- */
  --shadow-card: 0 1px 2px rgba(0, 9, 18, 0.04);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-body);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-body);
  color: var(--color-text-primary);
  background-color: var(--color-bg-main);
  -webkit-font-smoothing: antialiased;
}

img,
svg {
  display: block;
  max-width: 100%;
}

/* -----------------------------------------------------------------------------
   Typography
   ----------------------------------------------------------------------------- */

.dk-h1,
h1 {
  margin: 0 0 var(--space-4);
  font-size: var(--text-h1);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-tight);
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

.dk-h2,
h2 {
  margin: 0 0 var(--space-3);
  font-size: var(--text-h2);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-tight);
  letter-spacing: -0.015em;
  color: var(--color-text-primary);
}

.dk-h3,
h3 {
  margin: 0 0 var(--space-3);
  font-size: var(--text-h3);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-tight);
  color: var(--color-text-primary);
}

.dk-h4,
h4 {
  margin: 0 0 var(--space-2);
  font-size: var(--text-h4);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-tight);
  color: var(--color-text-primary);
}

.dk-p,
p {
  margin: 0 0 var(--space-4);
  color: var(--color-text-primary);
  line-height: var(--line-relaxed);
}

.dk-p:last-child,
p:last-child {
  margin-bottom: 0;
}

.dk-text-secondary {
  color: var(--color-text-secondary);
}

.dk-caption {
  margin: 0;
  font-size: var(--text-caption);
  line-height: var(--line-body);
  color: var(--color-text-secondary);
}

.dk-small {
  font-size: var(--text-small);
  line-height: var(--line-body);
  color: var(--color-text-secondary);
}

/* Matches .legal-prose / content links in styles.css */
.dk-link {
  color: var(--color-accent);
  font-weight: var(--font-weight-medium);
  text-decoration: underline;
  text-decoration-color: rgba(0, 9, 18, 0.28);
  text-underline-offset: 0.2em;
  transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}

.dk-link:hover {
  color: var(--color-accent-pressed);
  text-decoration-color: rgba(0, 9, 18, 0.5);
}

.dk-link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.dk-link:visited {
  color: var(--color-accent);
}

/* -----------------------------------------------------------------------------
   Buttons
   ----------------------------------------------------------------------------- */

.dk-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  width: 100%;
  min-height: var(--touch-min);
  padding: var(--space-3) var(--space-6);
  font-family: inherit;
  font-size: var(--text-body);
  font-weight: var(--font-weight-semibold);
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-btn);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast),
    border-color var(--transition-fast), opacity var(--transition-fast);
}

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

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

.dk-btn--primary {
  color: var(--color-on-accent);
  background-color: var(--color-accent);
}

.dk-btn--primary:hover:not(:disabled):not([aria-disabled="true"]) {
  background-color: var(--color-accent-pressed);
}

.dk-btn--primary:active:not(:disabled):not([aria-disabled="true"]) {
  background-color: var(--color-accent);
  opacity: 0.92;
}

.dk-btn--primary:disabled,
.dk-btn--primary[aria-disabled="true"] {
  background-color: var(--color-btn-primary-disabled-bg);
  color: var(--color-btn-primary-disabled-text);
}

.dk-btn--secondary {
  color: var(--color-text-primary);
  background-color: var(--color-bg-block);
}

.dk-btn--secondary:hover:not(:disabled):not([aria-disabled="true"]) {
  background-color: var(--color-btn-secondary-pressed-bg);
}

.dk-btn--secondary:active:not(:disabled):not([aria-disabled="true"]) {
  background-color: #ebebeb;
}

.dk-btn--secondary:disabled,
.dk-btn--secondary[aria-disabled="true"] {
  color: var(--color-btn-secondary-disabled-text);
}

.dk-btn--outline {
  color: var(--color-text-primary);
  background-color: transparent;
  border: 1.5px solid var(--color-accent);
  padding-top: calc(var(--space-3) - 1.5px);
  padding-bottom: calc(var(--space-3) - 1.5px);
}

.dk-btn--outline:hover:not(:disabled):not([aria-disabled="true"]) {
  background-color: var(--color-accent-muted);
}

.dk-btn--outline:disabled,
.dk-btn--outline[aria-disabled="true"] {
  border-color: rgba(0, 9, 18, 0.2);
  color: var(--color-btn-secondary-disabled-text);
}

.dk-btn--sm {
  min-height: 2.5rem;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-caption);
  border-radius: var(--radius-btn);
}

.dk-btn--md {
  min-height: var(--touch-min);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-body);
}

.dk-btn--lg {
  min-height: 3.25rem;
  padding: var(--space-4) var(--space-8);
  font-size: 1.0625rem;
  border-radius: var(--radius-btn);
}

.dk-btn--icon {
  width: var(--touch-min);
  min-width: var(--touch-min);
  padding: 0;
  border-radius: var(--radius-btn);
}

.dk-btn-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  width: 100%;
}

@media (min-width: 480px) {
  .dk-btn:not(.dk-btn--full-mobile) {
    width: auto;
    min-width: 8rem;
  }

  .dk-btn--full-mobile {
    width: auto;
    min-width: 6rem;
  }

  .dk-btn-row .dk-btn {
    width: 100%;
  }
}

/* -----------------------------------------------------------------------------
   Forms
   ----------------------------------------------------------------------------- */

.dk-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.dk-field:last-child {
  margin-bottom: 0;
}

.dk-label {
  font-size: var(--text-caption);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.dk-label--optional::after {
  content: " · " attr(data-optional);
  font-weight: var(--font-weight-regular);
  color: var(--color-text-secondary);
}

.dk-input,
.dk-select,
.dk-textarea {
  width: 100%;
  min-height: var(--touch-min);
  padding: 0 var(--space-5);
  font-family: inherit;
  font-size: var(--text-body);
  font-weight: var(--font-weight-regular);
  line-height: 1.3;
  color: var(--color-text-primary);
  background-color: var(--color-bg-block);
  border: none;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-fast), outline var(--transition-fast);
}

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

.dk-input:hover,
.dk-select:hover,
.dk-textarea:hover {
  box-shadow: 0 0 0 1px var(--color-border-subtle);
}

.dk-input:focus,
.dk-select:focus,
.dk-textarea:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 0;
  box-shadow: none;
}

.dk-input:disabled,
.dk-select:disabled,
.dk-textarea:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.dk-textarea {
  min-height: 6.5rem;
  padding: var(--space-4) var(--space-5);
  resize: vertical;
}

.dk-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='none' viewBox='0 0 16 16'%3E%3Cpath stroke='%23000912' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m4 6 4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-4) center;
  padding-right: var(--space-10);
  cursor: pointer;
}

.dk-checkbox {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  cursor: pointer;
  font-size: var(--text-caption);
  line-height: var(--line-relaxed);
  color: var(--color-text-primary);
}

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

.dk-checkbox__box {
  flex-shrink: 0;
  width: 1.25rem;
  height: 1.25rem;
  margin-top: 0.1em;
  background-color: var(--color-bg-block);
  border: 1.5px solid var(--color-border-subtle);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-card);
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.dk-checkbox__input:focus-visible + .dk-checkbox__box {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.dk-checkbox__input:checked + .dk-checkbox__box {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='10' fill='none' viewBox='0 0 12 10'%3E%3Cpath stroke='%23fff' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m1 5 3 3 7-7'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
}

.dk-checkbox__input:disabled + .dk-checkbox__box {
  opacity: 0.5;
}

.dk-hint {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
}

.dk-error {
  font-size: var(--text-small);
  color: var(--color-accent);
}

/* -----------------------------------------------------------------------------
   Cards
   ----------------------------------------------------------------------------- */

.dk-card {
  background-color: var(--color-bg-block);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.dk-card__body {
  padding: var(--space-5);
}

.dk-card__title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-h4);
  font-weight: var(--font-weight-semibold);
}

.dk-card__meta {
  margin: 0;
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
}

/* -----------------------------------------------------------------------------
   Badges
   ----------------------------------------------------------------------------- */

.dk-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-small);
  font-weight: var(--font-weight-medium);
  line-height: 1.3;
  color: var(--color-text-primary);
  background-color: var(--color-bg-block);
  border-radius: var(--radius-pill);
  box-shadow: 0 0 0 1px var(--color-border-subtle);
}

.dk-badge--accent {
  color: var(--color-on-accent);
  background-color: var(--color-accent);
  box-shadow: none;
}

.dk-badge--muted {
  color: var(--color-text-secondary);
  background-color: var(--color-accent-muted);
  box-shadow: none;
}

/* -----------------------------------------------------------------------------
   Icons (utility)
   ----------------------------------------------------------------------------- */

.dk-icon {
  width: 1.5rem;
  height: 1.5rem;
  flex-shrink: 0;
  color: currentColor;
}

.dk-icon--sm {
  width: 1.125rem;
  height: 1.125rem;
}

.dk-icon--lg {
  width: 2rem;
  height: 2rem;
}

.dk-icon-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(4.5rem, 1fr));
  gap: var(--space-4);
}

.dk-icon-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4);
  text-align: center;
  background-color: var(--color-bg-block);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.dk-icon-tile span {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  line-height: 1.2;
}

/* -----------------------------------------------------------------------------
   Showcase layout (design-kit.html)
   ----------------------------------------------------------------------------- */

.dk-page {
  min-height: 100vh;
  padding: var(--space-6) var(--container-padding) var(--space-12);
}

.dk-container {
  max-width: var(--container-max);
  margin-inline: auto;
}

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

.dk-section:last-child {
  margin-bottom: 0;
}

.dk-section__title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-h3);
  font-weight: var(--font-weight-bold);
}

.dk-section__lead {
  margin: 0 0 var(--space-6);
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
}

.dk-swatch-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

@media (min-width: 480px) {
  .dk-swatch-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.dk-swatch {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  background-color: var(--color-bg-block);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.dk-swatch[data-hex] {
  cursor: pointer;
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.dk-swatch[data-hex]:hover {
  box-shadow: 0 2px 8px rgba(0, 9, 18, 0.08);
}

.dk-swatch[data-hex]:active {
  transform: scale(0.98);
}

.dk-swatch[data-hex]:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.dk-swatch__chip {
  aspect-ratio: 1;
  border-radius: var(--radius-md);
  box-shadow: inset 0 0 0 1px var(--color-border-subtle);
}

.dk-swatch__name {
  font-size: var(--text-small);
  font-weight: var(--font-weight-medium);
  word-break: break-word;
}

.dk-swatch__hex {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  font-variant-numeric: tabular-nums;
}

.dk-stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: stretch;
}

.dk-stack--row {
  flex-direction: row;
  flex-wrap: wrap;
  align-items: center;
}

.dk-divider {
  height: 1px;
  margin: var(--space-6) 0;
  background-color: var(--color-border-subtle);
  border: none;
}

.dk-kicker {
  margin: 0 0 var(--space-2);
  font-size: var(--text-small);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}