/**
 * Anime Filler Filter - Main Stylesheet
 * Material Design inspired dark theme with purple accent
 */

/* ==========================================
   CSS Custom Properties (Design Tokens)
   ========================================== */

:root {
  /* Color palette - Material Dark with purple accent */
  --color-bg-page: #121212;
  --color-bg-surface: #1e1e1e;
  --color-bg-elevated: #2a2a2a;
  --color-bg-input: #2c2c2c;
  
  --color-text-primary: rgba(255, 255, 255, 0.87);
  --color-text-secondary: rgba(255, 255, 255, 0.60);
  --color-text-tertiary: rgba(255, 255, 255, 0.38);
  
  --color-accent-purple: #bb86fc;
  --color-accent-purple-bright: #cf6fff;
  --color-accent-purple-dim: #9965e0;
  
  --color-border: rgba(255, 255, 255, 0.12);
  --color-border-hover: rgba(255, 255, 255, 0.24);
  
  --color-status-canon: #4caf50;
  --color-status-filler: #ef5350;
  
  /* Typography */
  --font-body: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Consolas', 'Monaco', 'Courier New', monospace;
  
  /* Spacing scale */
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  
  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.5);
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================
   Base & Reset
   ========================================== */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  background-color: var(--color-bg-page);
  color: var(--color-text-primary);
  line-height: 1.6;
}

/* ==========================================
   Layout Components
   ========================================== */

.page {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
}

/* Hero section */
.hero {
  text-align: center;
  padding: var(--space-xl) 0;
}

.eyebrow {
  margin: 0 0 var(--space-xs);
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent-purple);
}

.hero h1 {
  margin: 0 0 var(--space-md);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-accent-purple-bright) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.lede {
  margin: 0 auto;
  max-width: 600px;
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* Main panel with inputs and output */
.panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  background: var(--color-bg-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-lg);
}

@media (min-width: 900px) {
  .panel {
    grid-template-columns: 400px 1fr;
  }
}

.panel__inputs {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.panel__output {
  min-height: 300px;
}

/* Steps list */
.steps {
  margin: 0;
  padding-left: var(--space-lg);
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.steps li {
  margin-bottom: var(--space-xs);
}

/* Material link */
.md-link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-weight: 500;
  color: var(--color-accent-purple);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.md-link:hover,
.md-link:focus-visible {
  color: var(--color-accent-purple-bright);
  border-color: currentColor;
}

.md-link:focus-visible {
  outline: none;
  box-shadow: 0 2px 0 var(--color-accent-purple);
}

/* ==========================================
   Form Fields
   ========================================== */

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.field__label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  letter-spacing: 0.02em;
}

.field__label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.save-slot-buttons {
  display: inline-flex;
  gap: 0.25rem;
}

.save-slot-button {
  border: 1px solid var(--color-border);
  background-color: transparent;
  color: var(--color-text-secondary);
  font-family: var(--font-body);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.2rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--transition-fast),
              border-color var(--transition-fast),
              color var(--transition-fast);
}

.save-slot-button:hover,
.save-slot-button:focus-visible {
  border-color: var(--color-accent-purple);
  color: var(--color-text-primary);
  outline: none;
  box-shadow: 0 0 0 2px rgba(187, 134, 252, 0.2);
}

.save-slot-button.is-active {
  background-color: rgba(187, 134, 252, 0.2);
  border-color: var(--color-accent-purple);
  color: var(--color-accent-purple-bright);
}

/* Text inputs and textarea */
textarea,
input[type="number"],
input[type="text"] {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--color-text-primary);
  background-color: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--transition-fast),
              box-shadow var(--transition-fast);
}

textarea {
  resize: vertical;
  min-height: 120px;
}

textarea::placeholder,
input::placeholder {
  color: var(--color-text-tertiary);
}

textarea:hover,
input:hover {
  border-color: var(--color-border-hover);
}

textarea:focus,
input:focus {
  border-color: var(--color-accent-purple);
  box-shadow: 0 0 0 3px rgba(187, 134, 252, 0.15);
}

/* Inline field grid */
.field-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-md);
}

.field-inline {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.episode-number {
  max-width: 120px;
}

/* ==========================================
   Empty State
   ========================================== */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  padding: var(--space-xl);
  text-align: center;
  color: var(--color-text-tertiary);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
}

.empty-state[data-empty="false"] {
  display: none;
}

.empty-state h2 {
  margin: 0 0 var(--space-sm);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.empty-state p {
  margin: 0;
  font-size: 0.9375rem;
}

/* ==========================================
   Episode Table
   ========================================== */

.table-wrap {
  width: 100%;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-bg-elevated);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.table-title {
  padding: var(--space-md);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  background-color: var(--color-bg-surface);
  border-bottom: 1px solid var(--color-border);
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.table-title__label {
  color: inherit;
}

.table-clear-button {
  margin-left: auto;
  font-size: 0.7rem;
}

.episode-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.5;
}

.episode-table thead th {
  text-align: left;
  padding: var(--space-sm) var(--space-md);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  background-color: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid var(--color-border);
}

.episode-table tbody td {
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--color-text-primary);
}

/* Zebra striping for canon episodes */
.episode-table tbody tr:nth-child(odd) {
  background-color: rgba(0, 0, 0, 0.1);
}

.episode-table tbody tr:nth-child(even) {
  background-color: rgba(0, 0, 0, 0.15);
}

/* Hover state */
.episode-table tbody tr:hover {
  background-color: rgba(187, 134, 252, 0.08);
}

/* Filler row styling */
.episode-table tbody tr.is-filler:nth-child(odd) {
  background-color: rgba(239, 83, 80, 0.08);
}

.episode-table tbody tr.is-filler:nth-child(even) {
  background-color: rgba(239, 83, 80, 0.12);
}

.episode-table tbody tr.is-filler:hover {
  background-color: rgba(239, 83, 80, 0.16);
}

.episode-table tbody tr.is-filler td {
  color: rgba(239, 83, 80, 0.9);
}

/* Status badge cell */
.episode-table td.status {
  width: 120px;
  text-align: center;
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.episode-table td.status.is-canon {
  color: var(--color-status-canon);
  background-color: rgba(76, 175, 80, 0.15);
}

.episode-table td.status.is-filler {
  color: var(--color-status-filler);
  background-color: rgba(239, 83, 80, 0.15);
}

.checkbox-header {
  width: 48px;
  text-align: center;
}

.checkbox-cell {
  width: 48px;
  text-align: center;
}

.episode-checkbox {
  width: 1rem;
  height: 1rem;
  cursor: pointer;
}

.episode-row {
  transition: opacity var(--transition-base);
}

.episode-row.row--checked {
  opacity: 0.6;
}

.episode-row.row--checked td {
  text-decoration: line-through;
  font-style: italic;
}

/* Episode number column */
.episode-table td.ep {
  width: 80px;
  font-weight: 600;
  color: var(--color-accent-purple);
}

.episode-table td.title {
  color: var(--color-text-primary);
}

/* ==========================================
   Footer
   ========================================== */

.page__footer {
  margin-top: auto;
  padding-top: var(--space-xl);
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
}

.page__footer p {
  margin: 0;
}

/* ==========================================
   Responsive Adjustments
   ========================================== */

@media (max-width: 600px) {
  .page {
    padding: var(--space-lg) var(--space-md);
    gap: var(--space-xl);
  }
  
  .hero h1 {
    font-size: 1.75rem;
  }
  
  .lede {
    font-size: 1rem;
  }
  
  .panel {
    padding: var(--space-lg);
  }
  
  .field-grid {
    grid-template-columns: 1fr;
  }
}