/* Day 16 — Sorting Visualizer */
/* Core styles establish the dark editorial lab and bar presentation. */

:root {
  color-scheme: dark;
  --bg: #06101d;
  --bg-2: #0d1726;
  --panel: rgba(9, 16, 30, 0.72);
  --panel-soft: rgba(255, 255, 255, 0.05);
  --panel-border: rgba(255, 255, 255, 0.1);
  --panel-shadow: 0 32px 90px rgba(2, 7, 18, 0.55);
  --text: #f5f7fb;
  --text-soft: rgba(229, 236, 248, 0.72);
  --accent: #66b7ff;
  --accent-2: #73f3ff;
  --compare: #ffc857;
  --swap: #ff6179;
  --sorted: #7ff0a4;
  --bar-gradient: linear-gradient(180deg, #85ecff 0%, #4fa7ff 45%, #2d53ff 100%);
  --surface-gradient: linear-gradient(145deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.01));
}

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

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background:
    radial-gradient(circle at 15% 20%, rgba(102, 183, 255, 0.18), transparent 24%),
    radial-gradient(circle at 82% 18%, rgba(115, 243, 255, 0.16), transparent 20%),
    radial-gradient(circle at 50% 82%, rgba(74, 95, 255, 0.18), transparent 30%),
    linear-gradient(160deg, var(--bg) 0%, var(--bg-2) 100%);
  color: var(--text);
  font-family: "Manrope", "Segoe UI", sans-serif;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 5rem 5rem;
  mask-image: radial-gradient(circle at center, rgba(0, 0, 0, 0.78), transparent 92%);
  opacity: 0.45;
}

.app-shell {
  position: relative;
  width: min(86rem, calc(100vw - 3rem));
  margin: 0 auto;
  padding: 1.5rem 0 2rem;
}

.hero-panel,
.control-rail,
.sort-panel {
  position: relative;
  border: 1px solid var(--panel-border);
  background: var(--panel);
  box-shadow: var(--panel-shadow);
  backdrop-filter: blur(28px) saturate(140%);
  -webkit-backdrop-filter: blur(28px) saturate(140%);
  overflow: hidden;
}

.hero-panel::before,
.control-rail::before,
.sort-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--surface-gradient);
  pointer-events: none;
}

.hero-panel {
  padding: 1.4rem 1.5rem;
  border-radius: 1.8rem;
}

.hero-panel__eyebrow,
.sort-panel__label {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.hero-panel h1,
.sort-panel h2 {
  margin: 0.55rem 0 0;
  font-family: "Space Grotesk", sans-serif;
  line-height: 0.98;
  letter-spacing: -0.05em;
}

.hero-panel h1 {
  font-size: clamp(2.8rem, 5vw, 4.8rem);
  max-width: 12ch;
}

.hero-panel__lede {
  max-width: 44rem;
  margin: 1rem 0 0;
  color: var(--text-soft);
  font-size: 1rem;
  line-height: 1.65;
}

/* Control rail */
.control-rail {
  display: flex;
  align-items: stretch;
  gap: 1rem;
  margin-top: 1rem;
  padding: 1rem;
  border-radius: 1.6rem;
}

.control-rail__cluster {
  display: flex;
  gap: 0.85rem;
}

.control-rail__cluster--buttons {
  min-width: fit-content;
}

.control-rail__cluster--toggles,
.control-rail__cluster--ranges {
  flex: 1;
}

.control-button,
.toggle-card,
.range-card,
.sort-panel select,
.stat-card {
  position: relative;
  z-index: 1;
}

.control-button {
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 1rem;
  padding: 0.95rem 1.2rem;
  font: inherit;
  font-weight: 700;
  color: var(--text);
  cursor: pointer;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background 180ms ease,
    box-shadow 180ms ease;
}

.control-button:hover,
.control-button:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(255, 255, 255, 0.24);
}

.control-button:disabled {
  opacity: 0.48;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.control-button--ghost {
  background: rgba(255, 255, 255, 0.05);
}

.control-button--primary {
  background: linear-gradient(135deg, rgba(102, 183, 255, 0.32), rgba(115, 243, 255, 0.18));
  box-shadow: 0 14px 30px rgba(102, 183, 255, 0.18);
}

.toggle-card,
.range-card {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  flex: 1;
  padding: 0.95rem 1rem;
  border-radius: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-soft);
}

.toggle-card {
  justify-content: space-between;
}

.toggle-card span:first-child,
.range-card span:first-child {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.toggle-card input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.toggle-card__ui {
  position: relative;
  width: 3.4rem;
  height: 1.9rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.07);
  transition: background 180ms ease, border-color 180ms ease;
}

.toggle-card__ui::after {
  content: "";
  position: absolute;
  top: 0.16rem;
  left: 0.18rem;
  width: 1.45rem;
  height: 1.45rem;
  border-radius: 50%;
  background: linear-gradient(145deg, #ffffff, #c6d6f7);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.28);
  transition: transform 180ms ease;
}

.toggle-card input:checked + .toggle-card__ui {
  background: linear-gradient(135deg, rgba(102, 183, 255, 0.62), rgba(115, 243, 255, 0.5));
  border-color: rgba(255, 255, 255, 0.28);
}

.toggle-card input:checked + .toggle-card__ui::after {
  transform: translateX(1.45rem);
}

.range-card {
  flex-direction: column;
  align-items: flex-start;
}

.range-card input[type="range"] {
  width: 100%;
  accent-color: var(--accent-2);
}

.range-card output {
  align-self: flex-end;
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 700;
}

/* Comparison panels */
.panel-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.sort-panel {
  padding: 1.2rem;
  border-radius: 1.6rem;
}

.sort-panel__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.sort-panel h2 {
  font-size: clamp(1.9rem, 2vw, 2.4rem);
}

.sort-panel__header label {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  min-width: 11rem;
  color: var(--text-soft);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.sort-panel select {
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 0.95rem;
  padding: 0.85rem 1rem;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font: inherit;
}

.sort-panel__stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}

.stat-card {
  padding: 0.9rem 1rem;
  border-radius: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.045);
}

.stat-card span {
  display: block;
  color: var(--text-soft);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.stat-card strong {
  display: block;
  margin-top: 0.4rem;
  font-size: 1.1rem;
}

/* Bar field */
.sort-panel__bars {
  display: flex;
  align-items: flex-end;
  gap: 0.3rem;
  height: 25rem;
  margin-top: 1rem;
  padding: 1rem;
  border-radius: 1.2rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02)),
    radial-gradient(circle at top, rgba(102, 183, 255, 0.12), transparent 58%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.sort-bar {
  position: relative;
  flex: 1 1 0;
  min-width: 0;
  height: calc(var(--value, 0) * 1%);
  border-radius: 999px 999px 0.4rem 0.4rem;
  background: var(--bar-gradient);
  box-shadow:
    0 0 18px rgba(102, 183, 255, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.36);
  transform-origin: bottom center;
  transition:
    height 180ms ease,
    background 180ms ease,
    box-shadow 180ms ease,
    filter 180ms ease,
    opacity 180ms ease;
}

.sort-bar::after {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 32%;
  border-radius: inherit;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.44), rgba(255, 255, 255, 0));
  opacity: 0.7;
}

.sort-bar.is-compare {
  background: linear-gradient(180deg, #ffe9a3 0%, #ffb547 100%);
  box-shadow:
    0 0 24px rgba(255, 200, 87, 0.42),
    inset 0 1px 0 rgba(255, 255, 255, 0.46);
  filter: saturate(1.12);
}

.sort-bar.is-swap {
  background: linear-gradient(180deg, #ff9bad 0%, #ff4e68 100%);
  box-shadow:
    0 0 30px rgba(255, 97, 121, 0.44),
    inset 0 1px 0 rgba(255, 255, 255, 0.36);
  filter: saturate(1.08);
}

.sort-bar.is-sorted {
  background: linear-gradient(180deg, #baffd1 0%, #59e090 100%);
  box-shadow:
    0 0 26px rgba(127, 240, 164, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

.no-script {
  margin: 1rem 0 0;
  padding: 0.85rem 1rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 1rem;
  background: rgba(9, 16, 30, 0.72);
  color: var(--text-soft);
}

@media (max-width: 1180px) {
  .control-rail {
    flex-wrap: wrap;
  }

  .control-rail__cluster--ranges {
    width: 100%;
  }

  .sort-panel__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 920px) {
  .app-shell {
    width: min(100vw - 1.5rem, 54rem);
    padding-top: 1rem;
  }

  .panel-grid {
    grid-template-columns: 1fr;
  }

  .sort-panel__header {
    flex-direction: column;
  }

  .sort-panel__header label {
    min-width: 0;
    width: 100%;
  }

  .sort-panel select {
    width: 100%;
  }
}

@media (max-width: 720px) {
  .app-shell {
    width: calc(100vw - 1rem);
    padding-bottom: 1.25rem;
  }

  .hero-panel,
  .control-rail,
  .sort-panel {
    border-radius: 1.3rem;
  }

  .hero-panel {
    padding: 1.1rem 1rem;
  }

  .hero-panel h1 {
    font-size: clamp(2.3rem, 11vw, 3.4rem);
  }

  .hero-panel__lede {
    font-size: 0.94rem;
  }

  .control-rail {
    padding: 0.8rem;
  }

  .control-rail__cluster {
    width: 100%;
    flex-wrap: wrap;
  }

  .control-button,
  .toggle-card,
  .range-card {
    min-height: 3.25rem;
  }

  .control-button {
    flex: 1 1 calc(50% - 0.5rem);
  }

  .toggle-card,
  .range-card {
    flex: 1 1 100%;
  }

  .sort-panel {
    padding: 1rem;
  }

  .sort-panel__stats {
    gap: 0.65rem;
  }

  .sort-panel__bars {
    height: 18rem;
    padding: 0.8rem 0.55rem;
    gap: 0.16rem;
  }
}

@media (max-width: 520px) {
  .control-button {
    flex-basis: 100%;
  }

  .sort-panel__stats {
    grid-template-columns: 1fr;
  }

  .stat-card strong {
    font-size: 1rem;
  }
}