/* ===== DESIGN TOKENS ===== */
:root {
  /* Type Scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Fonts */
  --font-display: 'Zodiak', 'Georgia', serif;
  --font-body: 'General Sans', 'Helvetica Neue', sans-serif;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
}

/* ===== LIGHT MODE (warm earthy palette — cat/nature theme) ===== */
:root, [data-theme="light"] {
  --color-bg:             #faf8f4;
  --color-surface:        #fff;
  --color-surface-2:      #f5f2ec;
  --color-surface-offset: #eee9e0;
  --color-divider:        #e0dbd3;
  --color-border:         #d4cfc6;
  --color-text:           #2c2418;
  --color-text-muted:     #7a7060;
  --color-text-faint:     #b5ad9e;

  /* Warm amber primary */
  --color-primary:        #b5730a;
  --color-primary-hover:  #945e08;
  --color-primary-active: #724906;
  --color-primary-light:  #fdf3e2;
  --color-primary-highlight: #f0e0c2;

  /* Earthy green accent */
  --color-accent:         #4a7c59;
  --color-accent-light:   #e8f2eb;

  /* Status */
  --color-success:        #4a7c59;
  --color-warning:        #c4690e;
  --color-error:          #b33a3a;

  --shadow-sm: 0 1px 2px rgba(44,36,24,0.06);
  --shadow-md: 0 4px 12px rgba(44,36,24,0.08);
  --shadow-lg: 0 12px 32px rgba(44,36,24,0.12);
}

/* ===== DARK MODE ===== */
[data-theme="dark"] {
  --color-bg:             #1a1714;
  --color-surface:        #231f1b;
  --color-surface-2:      #2c2720;
  --color-surface-offset: #332d25;
  --color-divider:        #3d362c;
  --color-border:         #4a4237;
  --color-text:           #e8e0d4;
  --color-text-muted:     #9c9283;
  --color-text-faint:     #655d50;

  --color-primary:        #e0a03c;
  --color-primary-hover:  #c88a2a;
  --color-primary-active: #b07520;
  --color-primary-light:  #2e2618;
  --color-primary-highlight: #3d3220;

  --color-accent:         #6aad7a;
  --color-accent-light:   #1e2b20;

  --color-success:        #6aad7a;
  --color-warning:        #e0a03c;
  --color-error:          #d45555;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.3);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.4);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:             #1a1714;
    --color-surface:        #231f1b;
    --color-surface-2:      #2c2720;
    --color-surface-offset: #332d25;
    --color-divider:        #3d362c;
    --color-border:         #4a4237;
    --color-text:           #e8e0d4;
    --color-text-muted:     #9c9283;
    --color-text-faint:     #655d50;
    --color-primary:        #e0a03c;
    --color-primary-hover:  #c88a2a;
    --color-primary-active: #b07520;
    --color-primary-light:  #2e2618;
    --color-primary-highlight: #3d3220;
    --color-accent:         #6aad7a;
    --color-accent-light:   #1e2b20;
    --color-success:        #6aad7a;
    --color-warning:        #e0a03c;
    --color-error:          #d45555;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.3);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.4);
  }
}

/* ===== HEADER ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
}

.header-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.logo svg {
  color: var(--color-primary);
}

.logo-text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
}

[data-theme-toggle] {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
}

[data-theme-toggle]:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}

/* ===== HERO ===== */
.hero {
  max-width: var(--content-default);
  margin: 0 auto;
  padding: var(--space-16) var(--space-6) var(--space-10);
  text-align: center;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.hero h1 em {
  font-style: italic;
  color: var(--color-primary);
}

.hero-sub {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ===== DECODER SECTION ===== */
.decoder-section {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: 0 var(--space-6) var(--space-16);
}

.decoder-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: start;
}

@media (max-width: 860px) {
  .decoder-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== SIGNAL CARDS ===== */
.selectors {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.signal-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}

.signal-card.has-selection {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary);
}

.signal-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.signal-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  color: var(--color-primary);
  flex-shrink: 0;
}

.signal-header h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
}

.signal-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.option-btn {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-text);
  text-align: left;
  background: transparent;
  border: 1px solid transparent;
  transition: all var(--transition-interactive);
}

.option-btn:hover {
  background: var(--color-surface-2);
  border-color: var(--color-border);
}

.option-btn[aria-checked="true"] {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  color: var(--color-primary);
  font-weight: 500;
}

.option-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  flex-shrink: 0;
  position: relative;
  transition: all var(--transition-interactive);
}

.option-btn[aria-checked="true"] .option-dot {
  border-color: var(--color-primary);
  background: var(--color-primary);
  box-shadow: inset 0 0 0 3px var(--color-surface);
}

/* ===== RESULTS PANEL ===== */
.results-panel {
  position: sticky;
  top: 80px;
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  min-height: 300px;
}

.results-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 260px;
  gap: var(--space-3);
}

.results-empty-icon {
  margin-bottom: var(--space-2);
  color: var(--color-text-faint);
}

.results-empty p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  font-weight: 500;
}

.results-hint {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

/* Results content */
.results-content {
  animation: fadeIn 400ms ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.mood-header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.mood-emoji {
  font-size: 3rem;
  line-height: 1;
  flex-shrink: 0;
}

.mood-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.confidence-bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.confidence-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  white-space: nowrap;
}

.confidence-track {
  flex: 1;
  height: 6px;
  background: var(--color-surface-offset);
  border-radius: var(--radius-full);
  overflow: hidden;
  min-width: 80px;
}

.confidence-fill {
  height: 100%;
  background: var(--color-accent);
  border-radius: var(--radius-full);
  transition: width 500ms cubic-bezier(0.16, 1, 0.3, 1);
}

.confidence-pct {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
  min-width: 32px;
}

.mood-description {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-6);
}

.signals-summary {
  margin-bottom: var(--space-6);
}

.signals-summary h4 {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-3);
  font-weight: 500;
}

.signals-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.signal-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 500;
}

.bonding-tip {
  background: var(--color-accent-light);
  border: 1px solid color-mix(in srgb, var(--color-accent) 20%, transparent);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin-bottom: var(--space-5);
}

.tip-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}

.bonding-tip p {
  font-size: var(--text-sm);
  color: var(--color-text);
  line-height: 1.7;
}

.warning-note {
  background: color-mix(in srgb, var(--color-warning) 8%, var(--color-surface));
  border: 1px solid color-mix(in srgb, var(--color-warning) 25%, transparent);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin-bottom: var(--space-5);
}

.warning-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-warning);
  margin-bottom: var(--space-2);
}

.warning-note p {
  font-size: var(--text-sm);
  color: var(--color-text);
  line-height: 1.7;
}

.reset-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  font-weight: 500;
  margin-top: var(--space-2);
}

.reset-btn:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

.reset-btn svg {
  display: inline;
  width: 16px;
  height: 16px;
}

/* ===== INFO SECTION ===== */
.info-section {
  max-width: var(--content-narrow);
  margin: 0 auto;
  padding: var(--space-12) var(--space-6) var(--space-16);
  text-align: center;
}

.info-section h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 500;
  margin-bottom: var(--space-4);
}

.info-section p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.8;
  margin: 0 auto;
}

/* ===== FOOTER ===== */
footer {
  text-align: center;
  padding: var(--space-6);
  border-top: 1px solid var(--color-divider);
}

footer a {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
}

footer a:hover {
  color: var(--color-text-muted);
}

/* ===== MOBILE ===== */
@media (max-width: 860px) {
  .hero {
    padding: var(--space-10) var(--space-4) var(--space-8);
  }

  .decoder-section {
    padding: 0 var(--space-4) var(--space-12);
  }

  .results-panel {
    position: static;
    padding: var(--space-6);
  }

  .signal-card {
    padding: var(--space-4) var(--space-5);
  }

  .mood-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .mood-emoji {
    font-size: 2.5rem;
  }
}