/* ============================================================
   Mosaic Grid Generator — tanbirahmod.com
   Static app chrome only. The mosaic grid layout itself is
   generated by script.js into a <style> tag (container queries)
   and exported to users as @media CSS.
   ============================================================ */

:root {
  /* ruler geometry: track maps 320px → 1120px */
  --m480: 20%;   /* (480 - 320) / 800 */
  --m768: 56%;   /* (768 - 320) / 800 */
  --m1024: 88%;  /* (1024 - 320) / 800 */

  --bg: #f6f2f3;
  --surface: #fdfcfc;
  --surface-2: #ffffff;
  --text: #2b2530;
  --text-soft: #8b8492;
  --line: #e9e2e5;
  --accent: #e8375f;
  --code-bg: #fbf8f9;
  --code-text: #443c4b;
  --code-comment: #a49aab;
  --code-atrule: #d92e57;
  --code-value: #0f8a7a;
  --sk: #ece5e8;
  --shadow: 0 10px 30px rgba(60, 30, 45, 0.08);
}

[data-theme="dark"] {
  --bg: #17151a;
  --surface: #201d24;
  --surface-2: #282430;
  --text: #f0ecf3;
  --text-soft: #9a92a4;
  --line: #363040;
  --accent: #ff4d75;
  --code-bg: #1b181f;
  --code-text: #d9d2e0;
  --code-comment: #6f6680;
  --code-atrule: #ff6b8e;
  --code-value: #4fd6c2;
  --sk: #322d3a;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  padding: 32px 20px 64px;
  background: var(--bg);
  color: var(--text);
  font-family: "Avenir Next", Avenir, "Segoe UI", system-ui, -apple-system, sans-serif;
  transition: background 0.35s, color 0.35s;
}

.app {
  max-width: 1180px;
  margin: 0 auto;
}

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

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: inherit;
  text-decoration: none;
}

.brand-avatar {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #f97316);
  color: #fff;
  font-size: 12px;
  letter-spacing: 0.5px;
}

.theme-toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-soft);
}

.switch {
  position: relative;
  width: 52px;
  height: 28px;
  border: none;
  border-radius: 999px;
  background: var(--accent);
  cursor: pointer;
  padding: 0;
}

.switch-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.switch[aria-checked="true"] .switch-thumb { transform: translateX(24px); }

.eyebrow {
  margin: 0 0 6px;
  text-align: center;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
}

.title {
  margin: 0;
  text-align: center;
  font-size: clamp(36px, 6vw, 52px);
  font-weight: 800;
}

.title .accent { color: var(--accent); }

.subtitle {
  margin: 8px 0 0;
  text-align: center;
  color: var(--text-soft);
  font-size: 17px;
}

/* ---------- Device tabs ---------- */

.device-tabs {
  display: flex;
  gap: 4px;
  max-width: 720px;
  margin: 28px auto 0;
  padding: 5px;
  border-radius: 999px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.device-tab {
  flex: 1;
  padding: 12px 8px;
  border: none;
  border-radius: 999px;
  background: transparent;
  color: var(--text-soft);
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.25s, color 0.25s;
}

.device-tab.active {
  background: var(--accent);
  color: #fff;
}

/* ---------- Ruler ---------- */

.ruler {
  max-width: 980px;
  margin: 30px auto 0;
}

.ruler-labels {
  position: relative;
  height: 22px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-soft);
  font-variant-numeric: tabular-nums;
}

.ruler-label {
  position: absolute;
  left: var(--pos);
  transform: translateX(-50%);
}

.ruler-readout {
  position: absolute;
  right: 0;
  font-size: 15px;
  font-weight: 800;
  color: var(--text);
}

.ruler-track {
  position: relative;
  height: 6px;
  border-radius: 999px;
  background: var(--line);
}

.ruler-fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0%;
  border-radius: 999px;
  background: var(--accent);
}

.ruler-tick {
  position: absolute;
  top: 50%;
  left: var(--pos);
  width: 4px;
  height: 14px;
  border-radius: 2px;
  transform: translate(-50%, -50%);
  background: var(--text-soft);
  opacity: 0.55;
}

/* ---------- Toolbar ---------- */

.toolbar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  max-width: 980px;
  margin: 26px auto 0;
}

.bp-badge {
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.ctrl-group {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.ctrl-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-soft);
}

.ctrl-btn {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border: none;
  border-radius: 50%;
  background: var(--line);
  color: var(--text);
  font-size: 16px;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
}

.ctrl-btn:hover { background: var(--accent); color: #fff; }

.ctrl-val {
  min-width: 38px;
  text-align: center;
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}

.btn {
  padding: 10px 18px;
  border: none;
  border-radius: 999px;
  font: inherit;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: filter 0.2s, background 0.2s;
}

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { filter: brightness(1.1); }

.btn-ghost {
  background: var(--surface);
  color: var(--text-soft);
  box-shadow: var(--shadow);
}
.btn-ghost:hover { color: var(--accent); }

/* ---------- Preview stage ---------- */

.stage {
  max-width: 980px;
  margin: 18px auto 0;
  padding: 14px;
  border: 2px dashed var(--line);
  border-radius: 20px;
}

.preview {
  position: relative;
  width: 100%;
  min-width: 320px;
  max-width: 100%;
  /* the whole trick: this panel is the responsive "viewport" */
  container: mosaic / inline-size;
}

.handle {
  position: absolute;
  top: 50%;
  right: 0;
  transform: translate(50%, -50%);
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: var(--text);
  color: var(--bg);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.3);
  cursor: ew-resize;
  touch-action: none;
  z-index: 2;
}

.handle::after {
  content: "";
  position: absolute;
  top: 100%;
  width: 5px;
  height: 46px;
  border-radius: 3px;
  background: var(--accent);
}

.hint {
  max-width: 980px;
  margin: 12px auto 0;
  text-align: center;
  font-size: 13px;
  color: var(--text-soft);
}

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

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 26px 16px 52px; /* bottom space for span controls */
  border-radius: 16px;
  background: var(--surface-2);
  box-shadow: var(--shadow);
}

.tag {
  position: absolute;
  top: -9px;
  left: 12px;
  max-width: calc(100% - 48px);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding: 3px 10px;
  border: none;
  border-radius: 999px;
  color: #fff;
  font: inherit;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  background: var(--tag-c, #999);
  cursor: text;
}

.tag-input {
  position: absolute;
  top: -9px;
  left: 12px;
  width: 130px;
  padding: 3px 10px;
  border: 2px solid var(--accent);
  border-radius: 999px;
  font: inherit;
  font-size: 11px;
  font-weight: 700;
  background: var(--surface-2);
  color: var(--text);
  outline: none;
  z-index: 3;
}

.card-x {
  position: absolute;
  top: -9px;
  right: 10px;
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border: none;
  border-radius: 50%;
  background: var(--text-soft);
  color: var(--surface-2);
  font-size: 13px;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s, background 0.15s;
}

.card-x:hover { background: var(--accent); }

.card:hover .card-x,
.card:focus-within .card-x { opacity: 1; }

.sk { display: block; background: var(--sk); border-radius: 8px; }
.sk-line { height: 10px; width: 70%; }
.sk-banner { flex: 1; min-height: 34px; }

.card-controls {
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 10px;
  display: flex;
  justify-content: space-between;
  gap: 8px;
  opacity: 0;
  transition: opacity 0.15s;
}

.card:hover .card-controls,
.card:focus-within .card-controls { opacity: 1; }

@media (hover: none) {
  .card-controls, .card-x { opacity: 1; }
}

.span-ctrl {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 3px 6px;
  border-radius: 999px;
  background: var(--surface);
  box-shadow: var(--shadow);
  font-size: 11px;
  font-weight: 700;
  color: var(--text-soft);
}

.span-ctrl b {
  min-width: 14px;
  text-align: center;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.span-btn {
  display: grid;
  place-items: center;
  width: 20px;
  height: 20px;
  border: none;
  border-radius: 50%;
  background: var(--line);
  color: var(--text);
  font-size: 13px;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
}

.span-btn:hover { background: var(--accent); color: #fff; }

.mosaic-empty {
  padding: 40px 20px;
  text-align: center;
  color: var(--text-soft);
  font-size: 14px;
}

/* ---------- Code panel ---------- */

.css-panel {
  max-width: 980px;
  margin: 30px auto 0;
  border-radius: 18px;
  background: var(--code-bg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.css-head {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
}

.css-title {
  font-weight: 800;
  letter-spacing: 1px;
  margin-right: auto;
}

.css-tabs { display: flex; gap: 4px; }

.css-tab {
  padding: 7px 14px;
  border: none;
  border-radius: 999px;
  background: transparent;
  color: var(--text-soft);
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.css-tab.active {
  background: var(--accent);
  color: #fff;
}

.copy-btn { padding: 8px 16px; font-size: 13px; }

.css-code {
  margin: 0;
  padding: 20px 24px 24px;
  max-height: 480px;
  overflow: auto;
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 14px;
  line-height: 1.7;
  color: var(--code-text);
}

.css-code .cm { color: var(--code-comment); font-style: italic; }
.css-code .at { color: var(--code-atrule); font-weight: 600; }
.css-code .vl { color: var(--code-value); }

@media (max-width: 560px) {
  .device-tab { letter-spacing: 0.5px; font-size: 11px; }
}