/**
 * Nour Al-Bayan Interactive Platform - Index Page Styles
 * Layout, hero banner, header actions, active student chip, roster modals, and shortcuts guide.
 * Lesson card styling is centralized in cards.css.
 */



body {
  color: var(--text-main, #0f172a);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  overflow-y: auto;
  -webkit-font-smoothing: antialiased;
  background-color: var(--bg, #f8fafc);
}

header {
  background: linear-gradient(135deg, #065f46 0%, #047857 50%, #0d9488 100%);
  color: #ffffff;
  text-align: center;
  padding: clamp(24px, 4vw, 40px) 20px clamp(20px, 3.5vw, 32px);
  box-shadow: 0 4px 20px rgba(4, 120, 87, 0.15);
  position: relative;
  overflow: hidden;
  width: 100%;
  flex-shrink: 0;
  box-sizing: border-box;
}

header::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #fbbf24, #10b981, #d97706);
}

header h1 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 900;
  letter-spacing: normal !important;
  margin-bottom: 6px;
}

header p {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  opacity: 0.95;
  font-weight: 500;
  letter-spacing: normal !important;
}

.header-actions {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-top: 16px;
  flex-wrap: wrap;
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
}

.stats-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 7px 18px;
  border-radius: 9999px;
  font-size: 0.88rem;
  font-weight: 700;
  color: #ffffff;
}

.action-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.4);
  color: #ffffff;
  padding: 7px 18px;
  border-radius: 9999px;
  font-size: 0.88rem;
  font-weight: 800;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  min-height: 44px;
}

.action-btn:hover {
  background: rgba(255, 255, 255, 0.35);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

.action-btn:focus-visible, .lesson-card:focus-visible {
  outline: 3px solid var(--color-primary, #047857);
  outline-offset: 3px;
}

/* Active Student Header Chip */
.active-student-chip {
  background: rgba(255, 255, 255, 0.22);
  border: 1.5px solid rgba(255, 255, 255, 0.45);
  padding: 5px 14px;
  gap: 8px;
  font-weight: 800;
}
.active-student-chip:hover {
  background: rgba(255, 255, 255, 0.38);
  border-color: #ffffff;
}
.chip-avatar {
  font-size: 1.15rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.chip-name {
  font-size: 0.88rem;
  font-weight: 800;
  max-width: 140px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.chip-score {
  background: rgba(0, 0, 0, 0.25);
  padding: 2px 8px;
  border-radius: 9999px;
  font-size: 0.78rem;
  color: #fef08a;
  font-weight: 900;
  font-family: ui-monospace, SFMono-Regular, monospace;
}

/* Roster Modal Styles */
.roster-tab-btn {
  padding: 10px 18px;
  font-weight: 800;
  font-size: 0.88rem;
  color: var(--text-muted, #64748b);
  border-bottom: 3px solid transparent;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  background: transparent;
  border-top: none;
  border-left: none;
  border-right: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}
.roster-tab-btn:hover {
  color: var(--color-primary, #047857);
  background: rgba(4, 120, 87, 0.04);
}
.roster-tab-btn.active {
  color: var(--color-primary, #047857);
  border-bottom-color: var(--color-primary, #047857);
  background: rgba(4, 120, 87, 0.08);
}
.roster-tab-btn:focus-visible {
  outline: 2px solid var(--color-primary, #047857);
  outline-offset: -2px;
}

/* Avatar Picker Grid */
.avatar-picker-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(44px, 1fr));
  gap: 8px;
  margin-top: 8px;
}
.avatar-option-btn {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  border: 2px solid #e2e8f0;
  background: #ffffff;
  font-size: 1.35rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.avatar-option-btn:hover {
  transform: scale(1.1);
  border-color: #10b981;
  background: #f0fdf4;
}
.avatar-option-btn.selected,
#roster-letter-btn.selected {
  border-color: var(--color-primary, #047857);
  background: #d1fae5;
  box-shadow: 0 0 0 3px rgba(4, 120, 87, 0.25);
  transform: scale(1.08);
}
.avatar-option-btn:focus-visible,
#roster-letter-btn:focus-visible {
  outline: 2px solid var(--color-primary, #047857);
  outline-offset: 2px;
}

/* Color Swatches */
.color-picker-grid {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 8px;
}
.color-swatch-btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 3px solid #ffffff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.color-swatch-btn:hover {
  transform: scale(1.18);
}
.color-swatch-btn.selected {
  box-shadow: 0 0 0 3px var(--color-primary, #047857), 0 4px 10px rgba(4, 120, 87, 0.3);
  transform: scale(1.15);
}
.color-swatch-btn:focus-visible {
  outline: 2px solid var(--color-primary, #047857);
  outline-offset: 3px;
}

/* Quranic Mistake Bank Text */
.mistake-word-card {
  background: var(--surface-card, #ffffff);
  border: 2px solid #fecdd3;
  border-radius: 18px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  text-align: center;
  box-shadow: 0 2px 8px rgba(244, 63, 94, 0.06);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.mistake-word-card:hover {
  transform: translateY(-2px);
  border-color: #f43f5e;
  box-shadow: 0 8px 16px rgba(244, 63, 94, 0.14);
}
.mistake-quran-text {
  font-family: var(--font-quran, 'Amiri', 'Traditional Arabic', serif);
  font-size: 1.85rem;
  font-weight: 700;
  color: #9f1239;
  line-height: 1.6;
  margin: 4px 0;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  letter-spacing: normal !important;
}

.mistake-word-card .segmented-container {
  display: flex;
  flex-direction: row;
  direction: rtl;
  justify-content: center;
  align-items: center;
  gap: 6px;
  padding: 4px;
  max-width: 100%;
  flex-wrap: wrap;
  margin: 4px 0;
}

.mistake-word-card .seg-box {
  min-width: 38px;
  max-width: 80px;
  height: auto;
  min-height: 48px;
  border-radius: 12px;
  font-size: 1.65rem;
  padding: 2px 6px;
  line-height: 1.2;
  box-shadow: 0 3px 0 rgba(0,0,0,0.12);
  border-width: 2px;
}

.mistake-word-card .letter-box {
  min-height: 48px;
  height: auto;
  border-radius: 14px;
  font-size: 1.65rem;
  padding: 4px 10px;
  box-shadow: 0 3px 0 rgba(0,0,0,0.12);
  width: 100%;
  margin: 4px 0;
  border-width: 2px;
}

main {
  flex: 1;
  width: 100%;
  max-width: 1280px;
  margin-inline: auto;
  padding: 32px 16px 48px;
}

.pwa-status {
  margin-block: 0 20px;
  padding: 12px 16px;
  border: 2px solid #b45309;
  border-radius: 12px;
  background: #fffbeb;
  color: #78350f;
  font-weight: 700;
}

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

.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.stage-heading {
  grid-column: 1 / -1;
  margin-block: 20px 0;
  list-style: none;
}

.stage-heading:first-child {
  margin-block-start: 0;
}

.stage-heading h2 {
  margin: 0;
  padding-block-end: 10px;
  border-bottom: 2px solid var(--border-color, #e2e8f0);
  color: var(--text-main, #0f172a);
  font-size: clamp(1.15rem, 2vw, 1.45rem);
}

.card-item {
  display: flex;
}

.empty {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--text-muted, #475569);
  padding: 48px 20px;
  background: var(--surface-card, #ffffff);
  border: 2px dashed var(--border-color, #e2e8f0);
  border-radius: 20px;
  font-size: 1.1rem;
  font-weight: 600;
}

footer {
  text-align: center;
  padding: 24px 20px;
  font-size: 0.88rem;
  color: var(--text-main, #0f172a);
  border-top: 1px solid var(--border-color, #e2e8f0);
  background: var(--surface-card, #ffffff);
}

footer p {
  margin-top: 4px;
  font-size: 0.82rem;
  color: var(--text-muted, #475569);
}