/* ================================================================
   LLM Arena — Stylesheet
   Modern CSS: custom properties, logical properties, container queries
   ================================================================ */

/* === Design Tokens (Light) === */
:root {
  --color-bg: #ffffff;
  --color-bg-secondary: #f5f6f8;
  --color-bg-tertiary: #ebedf0;
  --color-surface: #ffffff;
  --color-border: #d4d7dc;
  --color-border-light: #e8eaed;
  --color-text: #1a1c1e;
  --color-text-secondary: #5f6368;
  --color-text-muted: #80868b;
  --color-primary: #1a73e8;
  --color-primary-hover: #1557b0;
  --color-primary-text: #ffffff;
  --color-danger: #d93025;
  --color-danger-hover: #b3261e;
  --color-success: #188038;
  --color-warning: #e37400;
  --color-card-a: #4285f4;
  --color-card-b: #ea4335;
  --color-card-c: #34a853;
  --color-card-d: #fbbc04;

  --shadow-sm: 0 1px 2px rgba(0 0 0 / 6%), 0 1px 3px rgba(0 0 0 / 10%);
  --shadow-md: 0 4px 6px rgba(0 0 0 / 7%), 0 2px 4px rgba(0 0 0 / 6%);
  --shadow-lg: 0 10px 15px rgba(0 0 0 / 10%), 0 4px 6px rgba(0 0 0 / 5%);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", Menlo, Consolas, monospace;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  --max-width: 1400px;
  --transition: 200ms ease;
}

/* === Dark Theme === */
[data-theme="dark"] {
  --color-bg: #1a1c1e;
  --color-bg-secondary: #232527;
  --color-bg-tertiary: #2d3033;
  --color-surface: #232527;
  --color-border: #3c4043;
  --color-border-light: #303336;
  --color-text: #e8eaed;
  --color-text-secondary: #9aa0a6;
  --color-text-muted: #6e7681;
  --color-primary: #8ab4f8;
  --color-primary-hover: #a8c7fa;
  --color-primary-text: #1a1c1e;
  --color-danger: #f28b82;
  --color-danger-hover: #f6aea9;
  --color-success: #81c995;
  --color-warning: #fdd663;
  --color-card-a: #8ab4f8;
  --color-card-b: #f28b82;
  --color-card-c: #81c995;
  --color-card-d: #fdd663;
  --shadow-sm: 0 1px 2px rgba(0 0 0 / 30%);
  --shadow-md: 0 4px 6px rgba(0 0 0 / 40%);
  --shadow-lg: 0 10px 15px rgba(0 0 0 / 50%);
}

/* === System Preference Fallback === */
@media (prefers-color-scheme: dark) {
  [data-theme="system"] {
    --color-bg: #1a1c1e;
    --color-bg-secondary: #232527;
    --color-bg-tertiary: #2d3033;
    --color-surface: #232527;
    --color-border: #3c4043;
    --color-border-light: #303336;
    --color-text: #e8eaed;
    --color-text-secondary: #9aa0a6;
    --color-text-muted: #6e7681;
    --color-primary: #8ab4f8;
    --color-primary-hover: #a8c7fa;
    --color-primary-text: #1a1c1e;
    --color-danger: #f28b82;
    --color-danger-hover: #f6aea9;
    --color-success: #81c995;
    --color-warning: #fdd663;
    --color-card-a: #8ab4f8;
    --color-card-b: #f28b82;
    --color-card-c: #81c995;
    --color-card-d: #fdd663;
    --shadow-sm: 0 1px 2px rgba(0 0 0 / 30%);
    --shadow-md: 0 4px 6px rgba(0 0 0 / 40%);
    --shadow-lg: 0 10px 15px rgba(0 0 0 / 50%);
  }
}

/* === Reset & Base === */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  color-scheme: light dark;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

/* === Header === */
.arena-header {
  display: flex;
  align-items: baseline;
  gap: var(--space-md);
  padding: var(--space-lg) var(--space-xl);
  max-inline-size: var(--max-width);
  margin-inline: auto;
  border-block-end: 1px solid var(--color-border-light);
}

.arena-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.header-subtitle {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  flex: 1;
}

/* === Icon Button === */
.btn-icon {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-xs) var(--space-sm);
  cursor: pointer;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

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

.btn-icon:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* === Main Layout === */
main {
  max-inline-size: var(--max-width);
  margin-inline: auto;
  padding: var(--space-lg) var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

/* === Section Cards === */
.section-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
}

details.section-card {
  padding: var(--space-md) var(--space-lg);
}

details.section-card[open] {
  padding: var(--space-lg);
}

.section-heading {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.section-heading::-webkit-details-marker {
  display: none;
}

.section-heading:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.section-heading .chevron {
  transition: transform var(--transition);
  flex-shrink: 0;
  color: var(--color-text-muted);
}

details[open] > .section-heading .chevron {
  transform: rotate(90deg);
}

h2.section-heading {
  cursor: default;
}

.config-summary {
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--color-text-muted);
  margin-inline-start: auto;
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
  max-inline-size: 40%;
}

.section-heading-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-block-end: var(--space-md);
}

.section-heading-row h2 {
  font-size: 1.05rem;
  font-weight: 600;
}

.sp-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.sp-actions .btn-small {
  font-size: 0.75rem;
  padding: 4px 10px;
}

/* === Form === */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-md);
  margin-block-start: var(--space-md);
}

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

.form-field > label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-field input[type="text"],
.form-field input[type="url"],
.form-field input[type="password"],
.form-field input[type="number"],
.form-field textarea {
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  padding: var(--space-sm) 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgb(26 115 232 / 15%);
}

.form-field input[type="range"] {
  inline-size: 100%;
  accent-color: var(--color-primary);
}

.field-hint {
  color: var(--color-text-muted);
  font-size: 0.75rem;
  font-weight: 400;
  text-transform: none;
  letter-spacing: normal;
}

.field-hint code {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  background: var(--color-bg-tertiary);
  padding: 1px 4px;
  border-radius: 3px;
}

output {
  font-variant-numeric: tabular-nums;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  text-transform: none;
  letter-spacing: normal;
  font-weight: 400;
}

.checkbox-label input[type="checkbox"] {
  inline-size: 16px;
  block-size: 16px;
  accent-color: var(--color-primary);
  cursor: pointer;
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 8px 16px;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), opacity var(--transition);
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
}

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

.btn-secondary:hover:not(:disabled) {
  background: var(--color-bg-secondary);
}

.btn-danger {
  background: var(--color-bg);
  color: var(--color-danger);
  border-color: var(--color-danger);
}

.btn-danger:hover:not(:disabled) {
  background: var(--color-danger);
  color: #ffffff;
  border-color: var(--color-danger);
}

/* === System Prompts List === */
.system-prompts-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  list-style: none;
}

.system-prompt-item {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto 1fr;
  gap: var(--space-sm) var(--space-md);
  align-items: start;
}

.system-prompt-item .sp-label-input {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 4px 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  inline-size: 100%;
  max-inline-size: 300px;
}

.system-prompt-item .sp-label-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgb(26 115 232 / 15%);
}

.system-prompt-item .sp-content-input {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  padding: var(--space-sm) 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  resize: vertical;
  min-block-size: 60px;
  grid-column: 1 / -1;
}

.system-prompt-item .sp-content-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgb(26 115 232 / 15%);
}

.system-prompt-item .btn-remove-sp {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 4px 8px;
  cursor: pointer;
  color: var(--color-text-muted);
  font-size: 1.25rem;
  line-height: 1;
  transition: color var(--transition), border-color var(--transition);
  align-self: start;
  margin-block-start: 2px;
}

.system-prompt-item .btn-remove-sp:hover {
  color: var(--color-danger);
  border-color: var(--color-danger);
}

/* === User Prompt Textarea === */
#user-prompt-input {
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  resize: vertical;
  inline-size: 100%;
  min-block-size: 120px;
  margin-block-start: var(--space-md);
}

#user-prompt-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgb(26 115 232 / 15%);
}

/* === Controls Bar === */
.controls-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.controls-right {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* === Results === */
.results-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.results-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.run-meta {
  grid-column: 1 / -1;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

@media (min-width: 800px) {
  .results-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1200px) {
  .results-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.result-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  overflow: clip;
  display: flex;
  flex-direction: column;
  min-block-size: 300px;
}

.result-card-header {
  padding: var(--space-sm) var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  border-block-end: 1px solid var(--color-border-light);
  background: var(--color-bg-secondary);
}

.result-card-label {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.result-card-label .label-dot {
  inline-size: 10px;
  block-size: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.result-card-label.dot-a .label-dot { background: var(--color-card-a); }
.result-card-label.dot-b .label-dot { background: var(--color-card-b); }
.result-card-label.dot-c .label-dot { background: var(--color-card-c); }
.result-card-label.dot-d .label-dot { background: var(--color-card-d); }

.result-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

.result-card-body {
  padding: var(--space-md);
  flex: 1;
  overflow-y: auto;
  max-block-size: 500px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--color-text);
}

.result-card-body.error {
  color: var(--color-danger);
  font-family: var(--font-sans);
}

.result-card-body.loading {
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  display: flex;
  align-items: center;
  justify-content: center;
  font-style: italic;
}

.result-card-actions {
  padding: var(--space-sm) var(--space-md);
  border-block-start: 1px solid var(--color-border-light);
  display: flex;
  gap: var(--space-sm);
}

.result-card-actions .btn-small {
  font-size: 0.75rem;
  padding: 4px 10px;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--color-text-secondary);
  font-family: var(--font-sans);
  transition: background var(--transition);
}

.result-card-actions .btn-small:hover {
  background: var(--color-bg-tertiary);
}

/* === Reveal Bar === */
.reveal-bar {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
}

/* === CORS Info === */
.info-panel {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.info-panel p {
  margin-block: var(--space-sm) var(--space-md);
}

.cors-table {
  inline-size: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
}

.cors-table th {
  text-align: start;
  font-weight: 600;
  color: var(--color-text);
  padding: var(--space-sm) var(--space-md);
  border-block-end: 2px solid var(--color-border);
  background: var(--color-bg-secondary);
}

.cors-table td {
  padding: var(--space-sm) var(--space-md);
  border-block-end: 1px solid var(--color-border-light);
  vertical-align: top;
}

.cors-table code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--color-bg-tertiary);
  padding: 1px 5px;
  border-radius: 3px;
}

/* === Footer === */
.arena-footer {
  max-inline-size: var(--max-width);
  margin-inline: auto;
  padding: var(--space-lg) var(--space-xl);
  border-block-start: 1px solid var(--color-border-light);
  text-align: center;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.arena-footer code {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  background: var(--color-bg-tertiary);
  padding: 1px 4px;
  border-radius: 2px;
}

/* === Utility === */
.sr-only {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* === Animations === */
@keyframes spin {
  to { transform: rotate(360deg); }
}

.spinner {
  inline-size: 16px;
  block-size: 16px;
  border: 2px solid var(--color-border);
  border-block-start-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  display: inline-block;
}