*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-text: #1a1a2e;
  --color-text-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-spring: #f0c929;
  --color-summer: #7bafd4;
  --color-autumn: #c4713b;
  --color-winter: #3b5998;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 4px 12px rgba(0, 0, 0, 0.04);
  --shadow-elevated: 0 4px 12px rgba(0, 0, 0, 0.1), 0 8px 32px rgba(0, 0, 0, 0.08);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

header {
  text-align: center;
  padding: 3rem 1.5rem 1.5rem;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--color-text-muted);
  margin-top: 0.4rem;
  font-size: 1.05rem;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}

/* --- Input Section --- */

.input-section {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: flex-start;
  margin-bottom: 2.5rem;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.input-group label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
}

.hex-row {
  display: flex;
  align-items: center;
  border: 2px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  transition: border-color var(--transition);
}

.hex-row:focus-within {
  border-color: var(--color-text);
}

.hex-prefix {
  padding: 0.6rem 0 0.6rem 0.75rem;
  font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
  font-size: 1rem;
  color: var(--color-text-muted);
  user-select: none;
}

#hex-input {
  border: none;
  outline: none;
  font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
  font-size: 1rem;
  padding: 0.6rem 0.75rem 0.6rem 0.25rem;
  width: 7.5ch;
  text-transform: uppercase;
  background: transparent;
  color: var(--color-text);
}

#color-picker {
  width: 52px;
  height: 44px;
  border: 2px solid var(--color-border);
  border-radius: 8px;
  cursor: pointer;
  padding: 2px;
  background: var(--color-surface);
  transition: border-color var(--transition);
}

#color-picker:hover {
  border-color: var(--color-text);
}

/* --- Preview Area --- */

.preview-area {
  flex: 1;
  min-width: 200px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem;
}

.color-swatch {
  width: 72px;
  height: 72px;
  border-radius: 10px;
  border: 2px solid var(--color-border);
  background: #ff6b35;
  flex-shrink: 0;
  transition: background var(--transition), border-color var(--transition);
}

.result-text {
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.4;
}

.result-text .season-name {
  display: inline-block;
  padding: 0.1em 0.5em;
  border-radius: 6px;
  color: #fff;
}

.result-text .season-name[data-season="spring"] { background: var(--color-spring); color: #1a1a2e; }
.result-text .season-name[data-season="summer"] { background: var(--color-summer); }
.result-text .season-name[data-season="autumn"] { background: var(--color-autumn); }
.result-text .season-name[data-season="winter"] { background: var(--color-winter); }

.oklch-breakdown {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
  margin-top: 0.1rem;
}

/* --- Season Palettes --- */

.palettes-section {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.season-grid {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  border: 2px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.season-grid.highlighted {
  box-shadow: var(--shadow-elevated);
  transform: scale(1.02);
}

.season-grid[data-season="spring"].highlighted { border-color: var(--color-spring); }
.season-grid[data-season="summer"].highlighted { border-color: var(--color-summer); }
.season-grid[data-season="autumn"].highlighted { border-color: var(--color-autumn); }
.season-grid[data-season="winter"].highlighted { border-color: var(--color-winter); }

.season-grid h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.15rem;
}

.season-description {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

.color-chips {
  line-height: 0;
}

.color-canvas {
  width: 100%;
  height: auto;
  aspect-ratio: 270 / 120;
  border-radius: 8px;
  cursor: crosshair;
  background: var(--color-bg);
}

.canvas-tooltip {
  position: absolute;
  pointer-events: none;
  padding: 0.25rem 0.5rem;
  border-radius: 5px;
  font-size: 0.72rem;
  font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
  font-weight: 600;
  background: var(--color-text);
  color: var(--color-surface);
  white-space: nowrap;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.canvas-tooltip::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--tooltip-color, transparent);
  margin-right: 5px;
  vertical-align: middle;
}

/* --- Affinity Bars --- */

.affinity-bars {
  flex-basis: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.affinity-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.affinity-label {
  font-size: 0.78rem;
  font-weight: 600;
  width: 4.5rem;
  text-align: right;
  color: var(--color-text-muted);
  flex-shrink: 0;
}

.affinity-track {
  flex: 1;
  height: 10px;
  background: var(--color-border);
  border-radius: 5px;
  overflow: hidden;
}

.affinity-fill {
  height: 100%;
  border-radius: 5px;
  transition: width var(--transition);
}

.affinity-fill[data-season="spring"] { background: var(--color-spring); }
.affinity-fill[data-season="summer"] { background: var(--color-summer); }
.affinity-fill[data-season="autumn"] { background: var(--color-autumn); }
.affinity-fill[data-season="winter"] { background: var(--color-winter); }

.affinity-pct {
  font-size: 0.72rem;
  font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
  color: var(--color-text-muted);
  width: 3.5rem;
  text-align: right;
  flex-shrink: 0;
}

/* --- Diagnostic Wizard --- */

.wizard-section {
  margin-bottom: 2.5rem;
}

.wizard-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
  text-align: center;
}

.wizard-card h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.wizard-description {
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
  font-size: 1rem;
  line-height: 1.5;
}

.wizard-progress {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.wizard-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-border);
  transition: background var(--transition), transform var(--transition);
}

.wizard-dot.active {
  background: var(--color-text);
  transform: scale(1.3);
}

.wizard-dot.completed {
  background: var(--color-text-muted);
}

.wizard-step-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.wizard-question {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  line-height: 1.4;
}

.wizard-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.wizard-option {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  padding: 1.25rem 1rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  cursor: pointer;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

.wizard-option:hover {
  border-color: var(--color-text-muted);
  box-shadow: var(--shadow);
}

.wizard-option.selected {
  border-color: var(--color-text);
  box-shadow: var(--shadow-elevated);
  transform: scale(1.02);
}

.wizard-swatches {
  display: flex;
  gap: 0.5rem;
}

.wizard-swatch {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
}

.wizard-option-label {
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1.4;
}

.wizard-nav {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
}

.wizard-btn {
  padding: 0.6rem 1.5rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background var(--transition), border-color var(--transition), transform 0.2s ease;
}

.wizard-btn:hover {
  transform: scale(1.03);
}

.wizard-btn-primary {
  background: var(--color-text);
  color: var(--color-surface);
}

.wizard-btn-primary:hover {
  background: #2d2d4e;
}

.wizard-btn-secondary {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
}

.wizard-btn-secondary:hover {
  border-color: var(--color-text-muted);
}

.wizard-result {
  text-align: center;
}

.wizard-season-badge {
  display: inline-block;
  font-size: 1.6rem;
  font-weight: 700;
  padding: 0.3em 0.8em;
  border-radius: 10px;
  color: #fff;
  margin-bottom: 0.5rem;
}

.wizard-season-badge[data-season="spring"] { background: var(--color-spring); color: #1a1a2e; }
.wizard-season-badge[data-season="summer"] { background: var(--color-summer); }
.wizard-season-badge[data-season="autumn"] { background: var(--color-autumn); }
.wizard-season-badge[data-season="winter"] { background: var(--color-winter); }

.wizard-result-subtitle {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

.wizard-why-heading {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.wizard-reasons {
  list-style: none;
  text-align: left;
  max-width: 480px;
  margin: 0 auto 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.wizard-reasons li {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  padding-left: 1.2em;
  position: relative;
}

.wizard-reasons li::before {
  content: "\2022";
  position: absolute;
  left: 0;
  color: var(--color-text-muted);
}

.wizard-actions {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
}

/* --- Palette Mode Toggle --- */

.palette-mode-bar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.palette-mode-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.palette-mode-group {
  display: flex;
  border: 2px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
}

.palette-mode-btn {
  padding: 0.35rem 0.9rem;
  font-size: 0.82rem;
  font-weight: 600;
  font-family: inherit;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.palette-mode-btn:not(:last-child) {
  border-right: 2px solid var(--color-border);
}

.palette-mode-btn:hover {
  background: var(--color-border);
  color: var(--color-text);
}

.palette-mode-btn.active {
  background: var(--color-text);
  color: var(--color-surface);
}

/* --- Chip Grid --- */

.chip-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 3px;
}

.color-chip {
  aspect-ratio: 1;
  border-radius: 4px;
  cursor: crosshair;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.color-chip:hover {
  transform: scale(1.15);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  z-index: 1;
  position: relative;
}

.color-chip-empty {
  border: 2px dashed var(--color-border);
  background: var(--color-bg);
  cursor: default;
}

.color-chip-empty:hover {
  transform: none;
  box-shadow: none;
}

/* --- Responsive --- */

@media (max-width: 640px) {
  header { padding: 2rem 1rem 1rem; }
  header h1 { font-size: 1.5rem; }

  main { padding: 0 1rem 2rem; }

  .input-section {
    flex-direction: column;
    padding: 1.25rem;
  }

  .preview-area {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
    min-width: auto;
  }

  .palettes-section {
    grid-template-columns: 1fr;
  }

  .wizard-card {
    padding: 1.25rem;
  }

  .wizard-options {
    grid-template-columns: 1fr;
  }

  .wizard-actions {
    flex-direction: column;
  }

  .chip-grid {
    grid-template-columns: repeat(8, 1fr);
  }
}