/* ============================================================
   Via Crucis Tactilis — Accessible Audio Guide
   CSS: Accessibility-First Design System
   Colors: #000000 background, #FFFFFF text ONLY
   ============================================================ */

/* --- CSS Custom Properties --- */
:root {
  --bg-primary: #000000;
  --text-primary: #FFFFFF;
  --border: #FFFFFF;
  --disabled: #666666;
  --track-bg: #333333;
  --focus: #FFFFFF;

  --font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xl: 48px;
  --font-size-lg: 40px;
  --font-size-md: 32px;
  --font-size-base: 24px;
  --font-size-body: 20px;
  --font-size-sm: 18px;
  --font-size-xs: 16px;
  --line-height: 1.5;

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

  --touch-min: 60px;
  --touch-control: 80px;
  --border-width: 4px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: var(--font-size-body);
  line-height: var(--line-height);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* --- Skip Link --- */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--bg-primary);
  color: var(--text-primary);
  padding: var(--space-sm) var(--space-md);
  text-decoration: underline;
  font-size: var(--font-size-body);
  font-weight: bold;
  border: var(--border-width) solid var(--border);
  z-index: 9999;
}
.skip-link:focus {
  top: 0;
  outline: var(--border-width) dotted var(--focus);
  outline-offset: 4px;
}

/* --- Focus Styles — ALWAYS VISIBLE --- */
*:focus {
  outline: var(--border-width) dotted var(--focus);
  outline-offset: 4px;
}
*:focus:not(:focus-visible) {
  outline: var(--border-width) dotted var(--focus);
  outline-offset: 4px;
}
*:focus-visible {
  outline: var(--border-width) dotted var(--focus);
  outline-offset: 4px;
}

/* --- Screen-reader only class --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --- Typography --- */
h1 {
  font-size: var(--font-size-xl);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.5px;
}
h2 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  line-height: 1.2;
}
h3 {
  font-size: var(--font-size-md);
  font-weight: 700;
  line-height: 1.3;
}
p {
  font-size: var(--font-size-body);
  line-height: var(--line-height);
}

/* --- Layout --- */
.page-wrapper {
  max-width: 640px;
  margin: 0 auto;
  padding: var(--space-sm);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* --- Header --- */
.site-header {
  text-align: center;
  padding: var(--space-xl) var(--space-sm) var(--space-lg);
  border-bottom: 2px solid var(--border);
}
.site-header h1 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-xs);
}
.site-header .subtitle-ml {
  font-size: var(--font-size-md);
  margin-bottom: var(--space-xs);
}
.site-header .subtitle-en {
  font-size: var(--font-size-body);
}

/* --- Station Card (Home Page) --- */
.station-list {
  list-style: none;
  padding: 0;
  margin: var(--space-md) 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.station-card {
  display: block;
  text-decoration: none;
  color: var(--text-primary);
  background: var(--bg-primary);
  border: var(--border-width) solid var(--border);
  padding: var(--space-md);
  min-height: var(--touch-control);
  transition: background 0.1s ease;
  -webkit-tap-highlight-color: rgba(255,255,255,0.1);
}
.station-card:hover {
  background: #111111;
}
.station-card:active {
  background: #222222;
}
.station-card:focus {
  outline: var(--border-width) dotted var(--focus);
  outline-offset: 4px;
}

.station-card__number {
  font-size: var(--font-size-md);
  font-weight: 900;
  margin-bottom: var(--space-xs);
  display: block;
}
.station-card__title-en {
  font-size: var(--font-size-base);
  font-weight: 600;
  margin-bottom: 4px;
  display: block;
}
.station-card__title-ml {
  font-size: var(--font-size-body);
  font-weight: 400;
  display: block;
}

/* --- Divider --- */
.divider {
  border: none;
  border-top: 2px solid var(--border);
  margin: var(--space-md) 0;
}

/* --- Station Page Header --- */
.station-header {
  text-align: center;
  padding: var(--space-lg) var(--space-sm) var(--space-md);
}
.station-header__number {
  font-size: var(--font-size-lg);
  font-weight: 900;
  margin-bottom: var(--space-sm);
  display: block;
  letter-spacing: 2px;
}
.station-header__title {
  font-size: var(--font-size-base);
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: var(--space-xs);
}
.station-header__scripture {
  font-size: var(--font-size-sm);
  color: var(--text-primary);
  margin-top: var(--space-xs);
}

/* --- Audio Player --- */
.audio-player {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
}

/* Progress Bar */
.progress-container {
  padding: 0 var(--space-xs);
}
.progress-bar-wrapper {
  position: relative;
  height: 20px;
  background: var(--track-bg);
  border: 2px solid var(--border);
  cursor: pointer;
  margin-bottom: var(--space-xs);
}
.progress-bar-fill {
  height: 100%;
  background: var(--text-primary);
  width: 0%;
  transition: width 0.25s linear;
  pointer-events: none;
}
/* Native progress element fallback */
progress.audio-progress {
  width: 100%;
  height: 20px;
  appearance: none;
  -webkit-appearance: none;
  border: 2px solid var(--border);
  background: var(--track-bg);
  display: block;
  margin-bottom: var(--space-xs);
}
progress.audio-progress::-webkit-progress-bar {
  background: var(--track-bg);
}
progress.audio-progress::-webkit-progress-value {
  background: var(--text-primary);
}
progress.audio-progress::-moz-progress-bar {
  background: var(--text-primary);
}

.time-display {
  text-align: center;
  font-size: var(--font-size-sm);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: 1px;
}

/* Controls Row */
.controls-row {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  align-items: stretch;
}

/* Base Button */
.btn {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: var(--border-width) solid var(--border);
  font-family: var(--font-family);
  font-size: var(--font-size-body);
  font-weight: 700;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  text-align: center;
  min-height: var(--touch-min);
  min-width: var(--touch-min);
  padding: var(--space-sm);
  line-height: 1.2;
  -webkit-tap-highlight-color: rgba(255,255,255,0.1);
  text-decoration: none;
  transition: background 0.1s ease;
}
.btn:hover {
  background: #111111;
}
.btn:active {
  background: #222222;
}
.btn:focus {
  outline: var(--border-width) dotted var(--focus);
  outline-offset: 4px;
}
.btn:disabled,
.btn[aria-disabled="true"] {
  color: var(--disabled);
  border-color: var(--disabled);
  cursor: not-allowed;
  background: var(--bg-primary);
}

/* Control Buttons (audio controls) */
.btn--control {
  min-height: var(--touch-control);
  min-width: var(--touch-control);
  flex: 1;
}
.btn--play-pause {
  min-width: 100px;
  flex: 1.25;
}

.btn__icon {
  font-size: 28px;
  line-height: 1;
}
.btn__label {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

/* Navigation Row */
.nav-row {
  display: flex;
  gap: var(--space-sm);
}
.btn--nav {
  flex: 1;
  min-height: var(--touch-control);
  font-size: var(--font-size-body);
  text-align: center;
}

/* Language Switch Button */
.btn--lang-switch {
  width: 100%;
  min-height: 60px;
  font-size: var(--font-size-body);
  flex-direction: row;
  gap: var(--space-sm);
  margin-top: auto;
  letter-spacing: 0.5px;
}

/* --- Loading State --- */
.loading-indicator {
  text-align: center;
  font-size: var(--font-size-base);
  padding: var(--space-md);
  animation: pulse 1.5s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* --- Footer --- */
.site-footer {
  border-top: 2px solid var(--border);
  padding: var(--space-md) var(--space-sm);
  text-align: center;
  margin-top: auto;
}
.site-footer p {
  font-size: var(--font-size-xs);
  line-height: 1.6;
}

/* --- Announcer (hidden, for screen readers) --- */
#announcer {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --- Status display (visible on station page) --- */
.status-bar {
  text-align: center;
  font-size: var(--font-size-sm);
  padding: var(--space-xs);
  min-height: 28px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

/* --- Home link on station pages --- */
.home-link {
  display: block;
  text-align: center;
  color: var(--text-primary);
  text-decoration: underline;
  font-size: var(--font-size-sm);
  padding: var(--space-xs);
  min-height: var(--touch-min);
  display: flex;
  align-items: center;
  justify-content: center;
}
.home-link:focus {
  outline: var(--border-width) dotted var(--focus);
  outline-offset: 4px;
}

/* --- Offline notice --- */
.offline-notice {
  background: var(--bg-primary);
  border: var(--border-width) solid var(--border);
  padding: var(--space-md);
  text-align: center;
  font-size: var(--font-size-body);
  display: none;
  margin: var(--space-md) 0;
}
.offline-notice.visible {
  display: block;
}

/* --- Responsive --- */
@media (max-width: 400px) {
  :root {
    --font-size-xl: 36px;
    --font-size-lg: 32px;
    --font-size-md: 26px;
    --font-size-base: 22px;
  }
  .controls-row {
    gap: var(--space-xs);
  }
  .btn--control {
    min-width: 70px;
  }
}

@media (min-width: 641px) {
  .page-wrapper {
    padding: var(--space-md);
  }
}

/* Landscape optimization */
@media (orientation: landscape) and (max-height: 500px) {
  .site-header {
    padding: var(--space-sm);
  }
  .station-header {
    padding: var(--space-sm);
  }
  .audio-player {
    gap: var(--space-sm);
  }
}

/* High contrast media query (honor OS setting) */
@media (prefers-contrast: more) {
  .btn:hover {
    background: #1a1a1a;
  }
  .progress-bar-fill {
    background: #FFFFFF;
  }
}

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
  .loading-indicator {
    animation: none;
  }
  .progress-bar-fill {
    transition: none;
  }
}