:root {
  --bg: #fafafa;
  --text-primary: #424242;
  --text-secondary: rgba(0, 0, 0, 0.5);
  --text-secondary-solid: #757575;
  --text-disabled: #bdbdbd;
  --text-invert: #fafafa;

  --border-primary: rgba(0, 0, 0, 0.1);
  --border-secondary: rgba(0, 0, 0, 0.2);
  --border-tertiary: rgba(0, 0, 0, 0.3);

  --accent: #304ffe;
  --accent-bg: rgba(33, 150, 243, 0.1);
  --hover-bg: rgba(0, 0, 0, 0.05);

  --dark-bg: #323232;

  --radius-pill: 48px;
  --radius-xl: 16px;
  --radius-md: 8px;

  --font-ui: "Inter", system-ui, sans-serif;
  --font-mono: "Roboto Mono", "SFMono-Regular", Consolas, monospace;

  --active-colour: #424242;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-ui);
  -webkit-font-smoothing: antialiased;
}

button, input {
  font-family: inherit;
  color: inherit;
}

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

.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ---------- Header ---------- */

.header {
  display: flex;
  align-items: center;
  gap: 40px;
  height: 96px;
  flex-shrink: 0;
  padding: 24px;
  border-bottom: 1px solid var(--border-primary);
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.brand-logo { height: 32px; width: auto; }

.brand-title {
  font-size: 22px;
  color: var(--text-primary);
}

.header-search {
  position: relative;
  flex: 1 1 280px;
  max-width: 640px;
  display: flex;
  align-items: center;
  height: 40px;
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-xl);
  padding: 0 12px;
  gap: 8px;
  background: #fff;
}

.search-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  border: none;
  background: transparent;
  cursor: default;
  padding: 0;
  background-image: url("../assets/search.svg");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 16px;
  filter: invert(48%) sepia(0%) saturate(0%) brightness(50%);
  opacity: 0.55;
}

.search-input {
  flex: 1;
  min-width: 0;
  border: none;
  outline: none;
  background: transparent;
  font-size: 14px;
  color: var(--text-primary);
}

.search-input::placeholder { color: var(--text-secondary-solid); }

.search-clear {
  width: 20px;
  height: 20px;
  border: none;
  border-radius: 50%;
  background: var(--hover-bg);
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
}
.search-clear::before, .search-clear::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 10px;
  height: 1.5px;
  background: var(--text-secondary-solid);
  transform-origin: center;
}
.search-clear::before { transform: translate(-50%, -50%) rotate(45deg); }
.search-clear::after { transform: translate(-50%, -50%) rotate(-45deg); }

/* ---------- Body layout ---------- */

.body {
  display: flex;
  align-items: flex-start;
}

.sidebar {
  width: 360px;
  flex-shrink: 0;
  position: sticky;
  top: 0;
  padding: 48px;
  border-right: 1px solid var(--border-primary);
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.sidebar-title {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 20px;
  margin: 0;
  color: var(--text-primary);
}


.filter-block {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.filter-label {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.02em;
  text-transform: none;
  color: var(--text-secondary);
  margin: 0;
}

.divider {
  border: none;
  border-top: 1px solid var(--border-primary);
  margin: 0;
  width: 100%;
}

/* ---------- Weight slider ---------- */

.weight-slider-wrap { padding: 16px 0 0; }

.weight-slider-track {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  height: 16px;
  border-radius: 16px;
  background: rgba(0, 0, 0, 0.1);
}

.weight-dot {
  position: relative;
  z-index: 1;
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: var(--border-tertiary);
  cursor: pointer;
  transition: background 0.15s ease;
}

.weight-dot.active {
  background: var(--accent);
}

.weight-tick-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
}

.weight-tick-labels span {
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 10px;
  color: var(--text-secondary);
  width: 48px;
  text-align: center;
}

.weight-tick-labels span:first-child { text-align: left; }
.weight-tick-labels span:last-child { text-align: right; }
.weight-tick-labels span.active { color: var(--accent); }

/* ---------- Colour swatches ---------- */

.colour-swatches {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.swatch {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid transparent;
  padding: 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: none;
}

.swatch::before {
  content: "";
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--sw, #ccc);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.08);
}

.swatch[data-colour="#FFFFFF"]::before { box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.2); }

.swatch-multi::before {
  background: conic-gradient(from 0deg, #f44336, #e91e63, #9c27b0, #3f51b5, #2196f3, #4caf50, #cddc39, #ffeb3b, #ff9800, #f44336);
}

.swatch.active { border-color: var(--border-tertiary); }

.swatch-check {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
}
.swatch-check::after {
  content: "";
  width: 8px;
  height: 5px;
  border-left: 1.5px solid #fff;
  border-bottom: 1.5px solid #fff;
  transform: rotate(-45deg) translate(1px, -1px);
}
.swatch.active .swatch-check { display: flex; }
.swatch[data-colour="#FFFFFF"].active .swatch-check::after,
.swatch[data-colour="#FFD600"].active .swatch-check::after {
  border-color: #424242;
}

.hex-field {
  width: 100%;
}

.hex-field input {
  width: 100%;
  height: 40px;
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-xl);
  padding: 0 16px;
  font-size: 14px;
  outline: none;
  background: #fff;
  color: var(--text-primary);
}

.hex-field input::placeholder { color: var(--text-disabled); }
.hex-field input:focus { border-color: var(--accent); }

/* ---------- Category list ---------- */

.category-list {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 8px;
  width: 100%;
}

.category-item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 32px;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-secondary);
  cursor: pointer;
  transition: background-color 0.12s, border-color 0.12s;
}

.category-item input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
  pointer-events: none;
}

.category-item:has(input:checked) {
  background: var(--text-primary);
  border-color: var(--text-primary);
}
.category-item:has(input:checked) span.label { color: var(--text-invert); }

.category-item span.label {
  font-size: 12px;
  font-weight: 400;
  color: var(--text-primary);
  white-space: nowrap;
}

/* ---------- Sidebar footer ---------- */

.sidebar-footer {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  width: 100%;
  margin-top: auto;
  padding-top: 32px;
}

.footer-credit {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0;
}

.footer-credit-label {
  font-size: 10px;
  font-weight: 400;
  color: var(--text-primary);
}

.footer-credit-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.footer-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
}

.footer-link img { width: 24px; height: 24px; }
.footer-link:hover { opacity: 0.7; }

/* ---------- Main content / grid ---------- */

.content {
  flex: 1;
  padding: 48px;
  min-width: 0;
}

.content-title {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 20px;
  margin: 0 0 32px;
  color: var(--text-primary);
}

.icon-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, 80px);
  gap: 40px 32px;
}

.icon-tile {
  width: 80px;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  background: transparent;
  padding: 0;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  font-family: inherit;
}

.icon-tile-glyph {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
}

.icon-tile-glyph svg { width: 48px; height: 48px; }

.icon-tile-label {
  width: 100%;
  padding: 8px 4px;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 10px;
  color: var(--text-primary);
  text-align: center;
  word-break: break-word;
  line-height: 1.3;
}

.icon-tile:hover .icon-tile-glyph { background: rgba(0, 0, 0, 0.04); }

.icon-tile.selected {
  border-color: var(--accent);
  background: var(--accent-bg);
}
.icon-tile.selected .icon-tile-glyph { background: transparent; }

.empty-state {
  padding-top: 8px;
}

.empty-state p {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 20px;
  color: var(--text-primary);
  margin: 0;
}

/* ---------- Popups (shared) ---------- */

.popup-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
}

.popup-overlay[hidden] { display: none; }

.icon-btn {
  border: none;
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
  border-radius: var(--radius-pill);
}
.icon-btn img { width: 24px; height: 24px; }
.icon-btn.round { width: 40px; height: 40px; }
.icon-btn:hover { background: rgba(0, 0, 0, 0.05); }

.pill-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 40px;
  padding: 0 16px;
  border-radius: var(--radius-pill);
  border: none;
  cursor: pointer;
  font-size: 14px;
  white-space: nowrap;
}

.pill-btn.dark {
  background: var(--dark-bg);
  color: var(--text-invert);
}
.pill-btn.dark img { width: 16px; height: 16px; }
.pill-btn.dark:hover { background: #1f1f1f; }

.pill-btn.outline {
  background: transparent;
  border: 1px solid var(--dark-bg);
  color: var(--text-primary);
}
.pill-btn.outline:hover { background: rgba(0, 0, 0, 0.04); }
.pill-btn.full { flex: 1; }

/* ---------- Download popup ---------- */

.download-popup {
  position: relative;
  width: 360px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-radius: var(--radius-xl);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.popup-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.popup-header h3 {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 20px;
  margin: 0;
  color: var(--text-primary);
}

.popup-body {
  display: flex;
  align-items: center;
  gap: 16px;
}

.popup-icon-preview {
  width: 80px;
  height: 80px;
  flex-shrink: 0;
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
}
.popup-icon-preview svg { width: 48px; height: 48px; }

.popup-meta {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
}

.popup-meta-row {
  display: flex;
  gap: 8px;
  align-items: center;
}

.popup-meta-row dt {
  color: var(--text-primary);
  width: 62px;
  flex-shrink: 0;
}

.popup-meta-row dd {
  margin: 0;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 4px;
}

.meta-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--active-colour);
  display: inline-block;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.15);
}

.popup-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--dark-bg);
  color: var(--text-invert);
  font-size: 13px;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  white-space: nowrap;
  z-index: 100;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}
.toast[hidden] { display: none; }

/* ---------- Colour picker popup ---------- */

.colour-picker {
  width: 240px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-radius: var(--radius-xl);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.picker-sv {
  position: relative;
  height: 160px;
  border-radius: var(--radius-md);
  background:
    linear-gradient(to top, #000, transparent),
    linear-gradient(to right, #fff, hsl(0, 100%, 50%));
  cursor: crosshair;
  touch-action: none;
}

.picker-sv-thumb {
  position: absolute;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid #fff;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.3), 0 1px 3px rgba(0, 0, 0, 0.4);
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.picker-hue-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 8px;
}

.picker-swatch-preview {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--border-primary);
  flex-shrink: 0;
}

.picker-hue {
  position: relative;
  flex: 1;
  height: 9px;
  border-radius: 8px;
  background: linear-gradient(
    to right,
    #ff0000 0%,
    #ffff00 17%,
    #00ff00 33%,
    #00ffff 50%,
    #0000ff 67%,
    #ff00ff 83%,
    #ff0000 100%
  );
  cursor: pointer;
  touch-action: none;
}

.picker-hue-thumb {
  position: absolute;
  top: 50%;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid #fff;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.25);
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.picker-mode-tabs {
  display: flex;
  gap: 16px;
  padding: 0 8px;
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  flex: 1;
}

.radio-label input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.radio-dot {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1.5px solid var(--border-tertiary);
  position: relative;
  flex-shrink: 0;
}
.radio-label input:checked + .radio-dot { border-color: var(--accent); }
.radio-label input:checked + .radio-dot::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: 50%;
  background: var(--accent);
}

.picker-fields {
  display: flex;
  gap: 8px;
  padding: 0 8px;
}

.picker-field {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.picker-field label {
  font-size: 14px;
  color: var(--text-primary);
}

.picker-field input {
  width: 100%;
  height: 40px;
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-xl);
  padding: 0 12px;
  font-size: 14px;
  outline: none;
  background: #fff;
  min-width: 0;
}
.picker-field input:focus { border-color: var(--accent); }

.picker-actions {
  display: flex;
  gap: 8px;
  padding: 0 8px 8px;
}

/* ---------- Responsive ---------- */

.filter-toggle,
.sidebar-close,
.sidebar-overlay {
  display: none;
}

@media (max-width: 767px) {
  .header {
    height: auto;
    gap: 16px;
    padding: 24px;
  }
  .brand { order: 1; flex-basis: 100%; }
  .filter-toggle {
    display: flex;
    order: 2;
    flex-shrink: 0;
    max-width: 40px;
    max-height: 40px;
  }
  .header-search { order: 3; flex: 1 1 auto; }

  .sidebar-overlay {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: 99;
  }
  .sidebar-overlay[hidden] { display: none; }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    width: min(320px, 85vw);
    height: 100vh;
    background: var(--bg);
    border-right: none;
    padding: 32px;
    box-shadow: 8px 0 24px rgba(0, 0, 0, 0.12);
    overflow-y: auto;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
  }
  .sidebar.open { transform: translateX(0); }

  .sidebar-close { display: flex; }

  .content { padding: 24px; }
  .icon-grid { gap: 16px; }

  .popup-overlay { align-items: flex-end; }
  .download-popup {
    width: 100%;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    box-shadow: 0 -8px 8px rgba(0, 0, 0, 0.1);
    padding: 16px;
    gap: 16px;
  }
}