/* ── CSS Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── Theme Variables ── */
:root {
  --bg-deep: #0f1f2e;
  --bg-panel: #f5f1e8;
  --bg-code: #1a2a3a;
  --text-dark: #1e293b;
  --text-light: #e8e4dc;
  --border: #2a4365;
  --accent-orange: #f97316;
  --accent-cyan: #06b6d4;
  --accent-magenta: #ec4899;
  --success: #10b981;
  --shadow: 0 4px 24px rgba(0,0,0,0.35);
  --radius: 8px;
}

/* ── Base ── */
html { font-size: 16px; }
body {
  font-family: 'Source Sans 3', system-ui, sans-serif;
  background: var(--bg-deep);
  color: var(--text-light);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
}

/* Blueprint grid background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(42,67,101,0.25) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42,67,101,0.25) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* ── Header ── */
.site-header {
  position: relative;
  z-index: 1;
  border-bottom: 1px solid var(--border);
  background: rgba(15,31,46,0.92);
  backdrop-filter: blur(8px);
}
.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: 'Bebas Neue', sans-serif;
  font-size: 1.75rem;
  letter-spacing: 0.04em;
  color: var(--text-light);
}
.logo svg { color: var(--accent-orange); flex-shrink: 0; }
.tagline {
  font-size: 0.95rem;
  color: rgba(232,228,220,0.6);
  font-weight: 400;
}

/* ── Main Layout ── */
.main-container {
  position: relative;
  z-index: 1;
  flex: 1;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ── Mode Toggle ── */
.mode-toggle {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
}
.mode-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.5rem;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: rgba(15,31,46,0.7);
  color: rgba(232,228,220,0.6);
  font-family: 'Bebas Neue', sans-serif;
  font-size: 1.1rem;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: all 0.2s ease;
}
.mode-btn:hover {
  border-color: rgba(232,228,220,0.3);
  color: var(--text-light);
}
.mode-btn.active {
  color: var(--text-light);
  font-weight: 700;
}
.mode-btn.mode-flex.active {
  border-color: var(--accent-cyan);
  background: rgba(6,182,212,0.12);
  box-shadow: 0 0 16px rgba(6,182,212,0.15);
}
.mode-btn.mode-grid.active {
  border-color: var(--accent-magenta);
  background: rgba(236,72,153,0.12);
  box-shadow: 0 0 16px rgba(236,72,153,0.15);
}

/* ── Workspace ── */
.workspace {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 1.5rem;
  align-items: start;
}
@media (max-width: 960px) {
  .workspace { grid-template-columns: 1fr; }
}

/* ── Control Panel ── */
.control-panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  color: var(--text-dark);
}
.control-group + .control-group {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px dashed #c8c2b4;
}
.control-label {
  display: block;
  font-family: 'Bebas Neue', sans-serif;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  color: #6b5e4e;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}
.control-select {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid #c8c2b4;
  border-radius: 6px;
  background: #fff;
  color: var(--text-dark);
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.9rem;
  cursor: pointer;
  transition: border-color 0.15s;
}
.control-select:focus {
  outline: none;
  border-color: var(--accent-orange);
}

/* Slider */
.slider-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.control-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  border-radius: 3px;
  background: #d4cfc4;
  outline: none;
}
.control-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-orange);
  cursor: pointer;
  border: 2px solid #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,0.25);
}
.control-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-orange);
  cursor: pointer;
  border: 2px solid #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,0.25);
}
.slider-value {
  font-family: 'Fira Code', monospace;
  font-size: 0.85rem;
  color: #6b5e4e;
  min-width: 3ch;
  text-align: right;
}

/* Item count */
.item-count-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.count-btn {
  width: 32px;
  height: 32px;
  border: 1px solid #c8c2b4;
  border-radius: 6px;
  background: #fff;
  color: var(--text-dark);
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}
.count-btn:hover {
  border-color: var(--accent-orange);
  background: rgba(249,115,22,0.08);
}
.count-display {
  font-family: 'Fira Code', monospace;
  font-size: 0.95rem;
  min-width: 2ch;
  text-align: center;
}

/* Grid track editor */
.track-editor {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.track-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}
.track-block {
  position: relative;
  min-width: 48px;
  padding: 0.35rem 0.5rem;
  border: 2px solid var(--border);
  border-radius: 4px;
  background: #fff;
  text-align: center;
  cursor: pointer;
  transition: all 0.15s;
}
.track-block:hover {
  border-color: var(--accent-orange);
}
.track-block input {
  width: 100%;
  border: none;
  background: transparent;
  font-family: 'Fira Code', monospace;
  font-size: 0.8rem;
  text-align: center;
  color: var(--text-dark);
  outline: none;
}
.track-block .remove-track {
  position: absolute;
  top: -8px;
  right: -8px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #ef4444;
  color: #fff;
  font-size: 0.65rem;
  border: none;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  line-height: 1;
}
.track-block:hover .remove-track { display: flex; }
.add-track-btn {
  padding: 0.35rem 0.75rem;
  border: 2px dashed #c8c2b4;
  border-radius: 4px;
  background: transparent;
  color: #6b5e4e;
  font-family: 'Fira Code', monospace;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.15s;
}
.add-track-btn:hover {
  border-color: var(--accent-orange);
  color: var(--accent-orange);
}

/* ── Preview Section ── */
.preview-section {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 0.25rem;
}
.preview-label {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  color: rgba(232,228,220,0.6);
  text-transform: uppercase;
}
.preview-dims {
  font-family: 'Fira Code', monospace;
  font-size: 0.8rem;
  color: rgba(232,228,220,0.4);
}
.preview-container {
  background: var(--bg-panel);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  min-height: 360px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: auto;
}
.preview-container::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(42,67,101,0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42,67,101,0.08) 1px, transparent 1px);
  background-size: 20px 20px;
  pointer-events: none;
  border-radius: inherit;
}
.preview-box {
  position: relative;
  z-index: 1;
  min-height: 280px;
  border: 1px dashed var(--border);
  border-radius: 4px;
  padding: 0.5rem;
  transition: all 0.3s ease;
}

/* Preview items */
.preview-item {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Fira Code', monospace;
  font-weight: 500;
  font-size: 0.9rem;
  color: rgba(30,41,59,0.7);
  border-radius: 4px;
  min-height: 48px;
  min-width: 48px;
  transition: transform 0.15s ease;
  position: relative;
}
.preview-item:hover {
  transform: scale(1.02);
  z-index: 2;
}
.preview-item .item-label {
  font-size: 0.75rem;
  opacity: 0.7;
}

/* ── Presets ── */
.presets-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-top: 0.5rem;
}
.preset-chip {
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: rgba(15,31,46,0.6);
  color: rgba(232,228,220,0.7);
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.15s ease;
}
.preset-chip:hover {
  border-color: var(--accent-orange);
  color: var(--text-light);
  background: rgba(249,115,22,0.1);
}
.preset-chip.active {
  border-color: var(--accent-orange);
  background: rgba(249,115,22,0.15);
  color: var(--accent-orange);
}

/* ── CSS Output ── */
.css-output-section {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.css-output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  background: rgba(0,0,0,0.2);
}
.css-output-label {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  color: rgba(232,228,220,0.6);
  text-transform: uppercase;
}
.copy-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: rgba(255,255,255,0.05);
  color: var(--text-light);
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.15s;
}
.copy-btn:hover {
  border-color: var(--accent-orange);
  background: rgba(249,115,22,0.1);
}
.copy-btn.copied {
  border-color: var(--success);
  color: var(--success);
}
.css-code {
  padding: 1rem 1.25rem;
  font-family: 'Fira Code', monospace;
  font-size: 0.85rem;
  line-height: 1.7;
  overflow-x: auto;
  white-space: pre;
  color: var(--text-light);
}
.css-code .token-sel { color: #f97316; }
.css-code .token-prop { color: #06b6d4; }
.css-code .token-val { color: #a5b4fc; }
.css-code .token-punc { color: rgba(232,228,220,0.4); }
.css-code .token-num { color: #fbbf24; }

/* ── Footer ── */
.site-footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 1.25rem;
  border-top: 1px solid var(--border);
  color: rgba(232,228,220,0.35);
  font-size: 0.85rem;
}

/* ── Toast ── */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(120px);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  background: var(--bg-panel);
  color: var(--text-dark);
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  opacity: 0;
  transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
  z-index: 100;
  pointer-events: none;
}
.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .header-inner { flex-direction: column; align-items: flex-start; }
  .logo { font-size: 1.4rem; }
  .main-container { padding: 1rem; }
  .preview-container { min-height: 260px; padding: 1rem; }
  .css-code { font-size: 0.75rem; }
}