/* ============================================================
   COMPONENTS.CSS — Reusable UI Components
   ============================================================ */

/* ── NAVBAR ── */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--navbar-h);
  z-index: 100;
  background: rgba(7, 7, 15, 0.85);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--sp-8);
}

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

.navbar-logo-icon {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, var(--grammar-color), var(--pronunciation-color));
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: 0 4px 14px rgba(129, 140, 248, 0.4);
}

.navbar-brand {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--grammar-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar-sub {
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ── HERO ── */
.hero {
  padding-top: calc(var(--navbar-h) + var(--sp-20));
  padding-bottom: var(--sp-16);
  text-align: center;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  background: rgba(129, 140, 248, 0.12);
  border: 1px solid rgba(129, 140, 248, 0.25);
  color: var(--grammar-light);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--r-full);
  margin-bottom: var(--sp-6);
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.04em;
  background: linear-gradient(
    135deg,
    var(--text-primary) 0%,
    var(--grammar-light) 40%,
    var(--pronunciation-light) 70%,
    var(--listening-light) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
  animation: gradientShift 8s ease-in-out infinite alternate;
  margin-bottom: var(--sp-5);
}

@keyframes gradientShift {
  0%   { background-position: 0% 50%; }
  100% { background-position: 100% 50%; }
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  font-weight: 400;
  max-width: 560px;
  margin: 0 auto var(--sp-10);
  line-height: 1.7;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--sp-8);
  flex-wrap: wrap;
  margin-top: var(--sp-10);
}

.hero-stat {
  text-align: center;
}

.hero-stat-number {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.hero-stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: var(--sp-1);
}

/* ── SECTION TITLES ── */
.section-header {
  text-align: center;
  margin-bottom: var(--sp-12);
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: var(--sp-3);
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto;
}

/* ── SKILL CARDS GRID ── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-5);
  margin-bottom: var(--sp-20);
}

@media (max-width: 900px) {
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .skills-grid { grid-template-columns: 1fr; }
}

/* ── SKILL CARD ── */
.skill-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-xl);
  padding: var(--sp-8) var(--sp-6);
  cursor: pointer;
  overflow: hidden;
  transition: transform var(--t-slow), box-shadow var(--t-slow), border-color var(--t-base);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-4);
}

.skill-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--card-bg, transparent);
  opacity: 0;
  transition: opacity var(--t-base);
}

.skill-card:hover::before { opacity: 1; }

.skill-card::after {
  content: '';
  position: absolute;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: radial-gradient(circle at center, var(--card-glow, transparent) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--t-slow);
}

.skill-card:hover::after { opacity: 0.15; }

.skill-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 24px 60px var(--card-glow, rgba(0,0,0,0.4));
  border-color: var(--card-color, var(--border-default));
}

.skill-card.grammar    { --card-color: var(--grammar-color);     --card-glow: var(--grammar-glow);     --card-bg: var(--grammar-bg); }
.skill-card.listening  { --card-color: var(--listening-color);   --card-glow: var(--listening-glow);   --card-bg: var(--listening-bg); }
.skill-card.speaking   { --card-color: var(--speaking-color);    --card-glow: var(--speaking-glow);    --card-bg: var(--speaking-bg); }
.skill-card.writing    { --card-color: var(--writing-color);     --card-glow: var(--writing-glow);     --card-bg: var(--writing-bg); }
.skill-card.reading    { --card-color: var(--reading-color);     --card-glow: var(--reading-glow);     --card-bg: var(--reading-bg); }
.skill-card.pronunciation { --card-color: var(--pronunciation-color); --card-glow: var(--pronunciation-glow); --card-bg: var(--pronunciation-bg); }

.skill-card-icon {
  width: 72px; height: 72px;
  border-radius: var(--r-xl);
  background: var(--card-bg, var(--bg-card));
  border: 1px solid var(--card-color, var(--border-default));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  box-shadow: 0 0 30px var(--card-glow, transparent);
  transition: box-shadow var(--t-base), transform var(--t-spring);
  position: relative;
  z-index: 1;
}

.skill-card:hover .skill-card-icon {
  box-shadow: 0 0 45px var(--card-glow, transparent);
  transform: scale(1.1) rotate(-4deg);
}

.skill-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  position: relative;
  z-index: 1;
}

.skill-card-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  position: relative;
  z-index: 1;
}

.skill-card-count {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  background: var(--card-bg, rgba(255,255,255,0.06));
  border: 1px solid var(--card-color, var(--border-subtle));
  color: var(--card-color, var(--text-secondary));
  font-size: 0.78rem;
  font-weight: 600;
  padding: var(--sp-1) var(--sp-3);
  border-radius: var(--r-full);
  position: relative;
  z-index: 1;
  transition: background var(--t-base);
}

.skill-card-arrow {
  color: var(--card-color, var(--text-muted));
  font-size: 1.2rem;
  transition: transform var(--t-spring);
  position: relative;
  z-index: 1;
}

.skill-card:hover .skill-card-arrow { transform: translateX(5px); }

/* ── BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  font-size: 0.9rem;
  font-weight: 600;
  padding: var(--sp-3) var(--sp-6);
  border-radius: var(--r-md);
  border: 1px solid transparent;
  transition: all var(--t-base);
  cursor: pointer;
  letter-spacing: -0.01em;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.06);
  opacity: 0;
  transition: opacity var(--t-fast);
}

.btn:hover::after { opacity: 1; }
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: linear-gradient(135deg, var(--grammar-color), var(--accent));
  color: #fff;
  border-color: rgba(129,140,248,0.5);
  box-shadow: 0 4px 20px rgba(129,140,248,0.4);
}
.btn-primary:hover {
  box-shadow: 0 6px 28px rgba(129,140,248,0.55);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border-default);
  backdrop-filter: blur(8px);
}
.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-strong);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: transparent;
}
.btn-ghost:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.12);
  color: #f87171;
  border-color: rgba(239, 68, 68, 0.25);
}
.btn-danger:hover {
  background: rgba(239, 68, 68, 0.2);
  border-color: rgba(239, 68, 68, 0.4);
}

.btn-sm {
  font-size: 0.8rem;
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--r-sm);
}

.btn-lg {
  font-size: 1rem;
  padding: var(--sp-4) var(--sp-8);
  border-radius: var(--r-lg);
}

.btn-icon {
  width: 38px; height: 38px;
  padding: 0;
  border-radius: var(--r-md);
}

/* ── MODAL ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--bg-overlay);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-4);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t-base);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: var(--bg-glass);
  border: 1px solid var(--border-default);
  border-radius: var(--r-2xl);
  width: 100%;
  max-width: 720px;
  max-height: 88vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  transform: translateY(24px) scale(0.97);
  transition: transform var(--t-slow);
}

.modal-overlay.active .modal {
  transform: translateY(0) scale(1);
}

.modal-lg { max-width: 900px; }
.modal-sm { max-width: 460px; }

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-6) var(--sp-8);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border-radius: var(--r-2xl) var(--r-2xl) 0 0;
  z-index: 1;
}

.modal-title {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.modal-title-icon {
  font-size: 1.5rem;
}

.modal-close {
  width: 36px; height: 36px;
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 1.2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: all var(--t-fast);
}

.modal-close:hover {
  color: var(--text-primary);
  background: var(--bg-card-hover);
  border-color: var(--border-default);
}

.modal-body {
  padding: var(--sp-6) var(--sp-8);
}

.modal-footer {
  padding: var(--sp-5) var(--sp-8);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: flex-end;
  gap: var(--sp-3);
}

/* ── ACTIVITY CARD (inside modal) ── */
.activity-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-lg);
  padding: var(--sp-5) var(--sp-6);
  margin-bottom: var(--sp-4);
  transition: border-color var(--t-base), background var(--t-base);
}

.activity-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-default);
}

.activity-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--sp-3);
  margin-bottom: var(--sp-3);
}

.activity-card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.activity-card-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: var(--sp-4);
}

.activity-card-content {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-md);
  padding: var(--sp-4);
  font-size: 0.875rem;
  color: var(--text-primary);
  line-height: 1.75;
}

/* ── FORMS ── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  margin-bottom: var(--sp-5);
}

.form-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.01em;
}

.form-label span { color: var(--writing-color); }

.form-input,
.form-select,
.form-textarea {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--r-md);
  padding: var(--sp-3) var(--sp-4);
  font-size: 0.9rem;
  color: var(--text-primary);
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
  width: 100%;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-muted);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--grammar-color);
  box-shadow: 0 0 0 3px rgba(129,140,248,0.18);
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%238b93a8' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--sp-4) center;
  padding-right: var(--sp-10);
  cursor: pointer;
}

.form-select option {
  background: var(--bg-surface);
  color: var(--text-primary);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.form-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.form-error {
  font-size: 0.78rem;
  color: var(--writing-color);
}

/* File Upload */
.file-upload {
  border: 2px dashed var(--border-default);
  border-radius: var(--r-lg);
  padding: var(--sp-8);
  text-align: center;
  cursor: pointer;
  transition: all var(--t-base);
  position: relative;
}

.file-upload:hover {
  border-color: var(--grammar-color);
  background: var(--grammar-bg);
}

.file-upload input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}

.file-upload-icon { font-size: 2rem; margin-bottom: var(--sp-2); }
.file-upload-text { font-size: 0.9rem; color: var(--text-secondary); }
.file-upload-sub  { font-size: 0.78rem; color: var(--text-muted); margin-top: var(--sp-1); }

/* ── BADGES ── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--r-full);
  border: 1px solid transparent;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.badge-grammar       { background: var(--grammar-bg);       color: var(--grammar-light);       border-color: rgba(129,140,248,0.25); }
.badge-listening     { background: var(--listening-bg);     color: var(--listening-light);     border-color: rgba(45,212,191,0.25); }
.badge-speaking      { background: var(--speaking-bg);      color: var(--speaking-light);      border-color: rgba(251,191,36,0.25); }
.badge-writing       { background: var(--writing-bg);       color: var(--writing-light);       border-color: rgba(251,113,133,0.25); }
.badge-reading       { background: var(--reading-bg);       color: var(--reading-light);       border-color: rgba(56,189,248,0.25); }
.badge-pronunciation { background: var(--pronunciation-bg); color: var(--pronunciation-light); border-color: rgba(192,132,252,0.25); }

.badge-success { background: rgba(34,197,94,0.12); color: #86efac; border-color: rgba(34,197,94,0.25); }
.badge-warning { background: rgba(234,179,8,0.12); color: #fde047; border-color: rgba(234,179,8,0.25); }
.badge-danger  { background: rgba(239,68,68,0.12); color: #fca5a5; border-color: rgba(239,68,68,0.25); }
.badge-neutral { background: var(--bg-card); color: var(--text-secondary); border-color: var(--border-default); }

/* ── AUDIO PLAYER ── */
.audio-player {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--r-lg);
  padding: var(--sp-4) var(--sp-5);
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

.audio-play-btn {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--listening-color), var(--accent));
  border: none;
  color: #fff;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--t-base);
  cursor: pointer;
  box-shadow: 0 4px 16px var(--listening-glow);
}

.audio-play-btn:hover {
  transform: scale(1.08);
  box-shadow: 0 6px 24px var(--listening-glow);
}

.audio-track {
  flex: 1;
}

.audio-waveform {
  height: 32px;
  display: flex;
  align-items: center;
  gap: 2px;
  cursor: pointer;
  margin-bottom: var(--sp-1);
}

.audio-bar {
  width: 3px;
  background: var(--border-default);
  border-radius: 2px;
  transition: background var(--t-fast), height var(--t-fast);
  flex-shrink: 0;
}

.audio-bar.active { background: var(--listening-color); }

.audio-progress {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* ── RECORDING WIDGET ── */
.recording-widget {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--r-xl);
  padding: var(--sp-6);
  text-align: center;
}

.record-btn {
  width: 80px; height: 80px;
  border-radius: 50%;
  background: rgba(251, 113, 133, 0.12);
  border: 2px solid var(--writing-color);
  color: var(--writing-color);
  font-size: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--sp-4);
  cursor: pointer;
  transition: all var(--t-base);
  position: relative;
}

.record-btn:hover {
  background: rgba(251, 113, 133, 0.2);
  box-shadow: 0 0 30px var(--writing-glow);
  transform: scale(1.05);
}

.record-btn.recording {
  background: rgba(251, 113, 133, 0.25);
  animation: pulseRecord 1.4s ease-in-out infinite;
}

@keyframes pulseRecord {
  0%, 100% { box-shadow: 0 0 0 0 rgba(251,113,133,0.4); }
  50%       { box-shadow: 0 0 0 20px rgba(251,113,133,0); }
}

.record-timer {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.record-status {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: var(--sp-2);
}

/* ── PHONEME CARDS (Pronunciation) ── */
.phoneme-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--sp-3);
}

.phoneme-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-lg);
  padding: var(--sp-4);
  cursor: pointer;
  transition: all var(--t-base);
  text-align: center;
}

.phoneme-card:hover {
  background: var(--pronunciation-bg);
  border-color: var(--pronunciation-color);
  transform: translateY(-3px);
  box-shadow: 0 10px 30px var(--pronunciation-glow);
}

.phoneme-ipa {
  font-size: 2rem;
  font-weight: 700;
  color: var(--pronunciation-color);
  letter-spacing: -0.02em;
  margin-bottom: var(--sp-2);
}

.phoneme-type {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: var(--sp-2);
}

.phoneme-words {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-1);
  justify-content: center;
}

.phoneme-word {
  font-size: 0.72rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 2px 8px;
  border-radius: var(--r-full);
}

/* ── TOAST NOTIFICATIONS ── */
.toast-container {
  position: fixed;
  bottom: var(--sp-6);
  right: var(--sp-6);
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  background: var(--bg-glass);
  border: 1px solid var(--border-default);
  border-radius: var(--r-lg);
  padding: var(--sp-4) var(--sp-5);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(20px);
  min-width: 260px;
  max-width: 380px;
  animation: toastIn 0.3s var(--t-spring) forwards;
}

.toast.removing {
  animation: toastOut 0.25s ease forwards;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(40px) scale(0.95); }
  to   { opacity: 1; transform: translateX(0) scale(1); }
}
@keyframes toastOut {
  from { opacity: 1; transform: translateX(0); }
  to   { opacity: 0; transform: translateX(40px); }
}

.toast-icon { font-size: 1.2rem; flex-shrink: 0; }
.toast-text { flex: 1; font-size: 0.875rem; color: var(--text-primary); font-weight: 500; }

.toast.success { border-color: rgba(34,197,94,0.35); }
.toast.error   { border-color: rgba(239,68,68,0.35); }
.toast.info    { border-color: rgba(129,140,248,0.35); }

/* ── DIVIDER ── */
.divider {
  height: 1px;
  background: var(--border-subtle);
  margin: var(--sp-6) 0;
}

/* ── EMPTY STATE ── */
.empty-state {
  text-align: center;
  padding: var(--sp-12) var(--sp-8);
  color: var(--text-muted);
}
.empty-state-icon { font-size: 3rem; margin-bottom: var(--sp-4); opacity: 0.4; }
.empty-state-title { font-size: 1rem; font-weight: 600; color: var(--text-secondary); margin-bottom: var(--sp-2); }
.empty-state-text  { font-size: 0.85rem; }

/* ── LOADING SPINNER ── */
.spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--border-subtle);
  border-top-color: var(--grammar-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── TEACHER DASHBOARD LAYOUT ── */
.dashboard-layout {
  display: flex;
  min-height: 100vh;
  padding-top: var(--navbar-h);
}

.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  position: fixed;
  top: var(--navbar-h);
  bottom: 0;
  left: 0;
  overflow-y: auto;
  z-index: 50;
}

.sidebar-section {
  padding: var(--sp-5) var(--sp-4);
  border-bottom: 1px solid var(--border-subtle);
}

.sidebar-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: var(--sp-3);
  padding: 0 var(--sp-2);
}

.sidebar-nav-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--r-md);
  cursor: pointer;
  transition: all var(--t-fast);
  margin-bottom: 2px;
}

.sidebar-nav-item:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

.sidebar-nav-item.active {
  background: var(--grammar-bg);
  color: var(--grammar-light);
  border: 1px solid rgba(129,140,248,0.25);
}

.sidebar-nav-item-left {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.sidebar-nav-item.active .sidebar-nav-item-left { color: var(--grammar-light); }
.sidebar-nav-item:hover .sidebar-nav-item-left  { color: var(--text-primary); }

.sidebar-nav-icon { font-size: 1.1rem; width: 20px; text-align: center; }

.sidebar-count {
  font-size: 0.72rem;
  font-weight: 700;
  min-width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-full);
  color: var(--text-muted);
}

.dashboard-main {
  flex: 1;
  margin-left: var(--sidebar-w);
  padding: var(--sp-8);
  position: relative;
  z-index: 1;
}

.dashboard-header {
  margin-bottom: var(--sp-8);
}

.dashboard-title {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: var(--sp-1);
}

.dashboard-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ── STAT CARDS (Teacher) ── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--sp-3);
  margin-bottom: var(--sp-8);
}

@media (max-width: 1100px) { .stats-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 600px)  { .stats-grid { grid-template-columns: repeat(2, 1fr); } }

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-lg);
  padding: var(--sp-4);
  text-align: center;
  transition: all var(--t-base);
  cursor: pointer;
}

.stat-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.stat-card-icon { font-size: 1.5rem; margin-bottom: var(--sp-2); }
.stat-card-num  { font-size: 1.75rem; font-weight: 800; letter-spacing: -0.03em; color: var(--text-primary); }
.stat-card-label{ font-size: 0.72rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; margin-top: var(--sp-1); }

/* ── ACTIVITY MANAGER LIST ── */
.activity-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-4);
}

.manager-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-lg);
  padding: var(--sp-4) var(--sp-5);
  margin-bottom: var(--sp-3);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--sp-4);
  transition: all var(--t-base);
}

.manager-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-default);
}

.manager-card-info { flex: 1; min-width: 0; }
.manager-card-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--sp-1);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.manager-card-meta {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.manager-card-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  flex-shrink: 0;
}

/* ── TOGGLE SWITCH ── */
.toggle {
  position: relative;
  display: inline-block;
  width: 40px; height: 22px;
}
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--r-full);
  cursor: pointer;
  transition: all var(--t-base);
}
.toggle-slider::before {
  content: '';
  position: absolute;
  width: 16px; height: 16px;
  left: 2px; top: 2px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: all var(--t-base);
}
.toggle input:checked + .toggle-slider {
  background: var(--grammar-bg);
  border-color: var(--grammar-color);
}
.toggle input:checked + .toggle-slider::before {
  transform: translateX(18px);
  background: var(--grammar-color);
}

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  .sidebar { display: none; }
  .dashboard-main { margin-left: 0; padding: var(--sp-4); }
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
  .modal { border-radius: var(--r-xl); }
  .modal-header, .modal-body, .modal-footer { padding-left: var(--sp-5); padding-right: var(--sp-5); }
}

/* ── TABS ── */
.tabs {
  display: flex;
  gap: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-lg);
  padding: var(--sp-1);
  margin-bottom: var(--sp-6);
}

.tab-btn {
  flex: 1;
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--r-md);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--t-base);
  text-align: center;
  border: 1px solid transparent;
}

.tab-btn.active {
  background: var(--grammar-bg);
  color: var(--grammar-light);
  border-color: rgba(129,140,248,0.3);
}

.tab-btn:hover:not(.active) {
  color: var(--text-secondary);
  background: var(--bg-card-hover);
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ── FILTER BAR ── */
.filter-bar {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-wrap: wrap;
  margin-bottom: var(--sp-5);
}

.filter-chip {
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--r-full);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: all var(--t-fast);
}

.filter-chip:hover { color: var(--text-primary); border-color: var(--border-default); }
.filter-chip.active { color: var(--grammar-light); background: var(--grammar-bg); border-color: rgba(129,140,248,0.3); }

/* Password Gate */
.password-gate {
  position: fixed;
  inset: 0;
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-base);
}

.password-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-default);
  border-radius: var(--r-2xl);
  padding: var(--sp-10) var(--sp-12);
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-xl);
  text-align: center;
}

.password-icon {
  width: 70px; height: 70px;
  margin: 0 auto var(--sp-5);
  background: linear-gradient(135deg, var(--grammar-color), #7c3aed);
  border-radius: var(--r-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  box-shadow: 0 8px 30px rgba(129,140,248,0.4);
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: var(--sp-6) 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
  position: relative;
  z-index: 1;
}

/* ── CURRICULUM GRID ── */
.curriculum-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--sp-4);
}

@media (max-width: 640px) {
  .curriculum-grid { grid-template-columns: 1fr; }
}

.curriculum-week-card:hover {
  border-color: var(--border-default) !important;
  background: var(--bg-card-hover) !important;
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

/* ── LINE CLAMP UTILITY ── */
.line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ============================================================
   LIGHT THEME — Component Overrides
   ============================================================ */

/* Navbar */
[data-theme="light"] .navbar {
  background: rgba(244, 244, 245, 0.88);
  border-bottom-color: rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .navbar-brand {
  background: linear-gradient(135deg, var(--text-primary) 30%, #2563eb);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

[data-theme="light"] .navbar-logo-icon {
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.25);
}

/* Sidebar */
[data-theme="light"] .sidebar {
  background: #ffffff;
  border-right-color: rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .sidebar-nav-item.active {
  background: rgba(37, 99, 235, 0.08);
  color: #2563eb;
  border-color: rgba(37, 99, 235, 0.2);
}

[data-theme="light"] .sidebar-nav-item.active .sidebar-nav-item-left {
  color: #2563eb;
}

[data-theme="light"] .sidebar-nav-item:hover {
  background: rgba(0, 0, 0, 0.04);
}

/* Buttons */
[data-theme="light"] .btn-primary {
  background: linear-gradient(135deg, #2563eb, #4f46e5);
  border-color: rgba(37, 99, 235, 0.4);
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.25);
}

[data-theme="light"] .btn-primary:hover {
  box-shadow: 0 6px 24px rgba(37, 99, 235, 0.35);
}

[data-theme="light"] .btn-secondary {
  background: #ffffff;
  border-color: rgba(0, 0, 0, 0.12);
}

[data-theme="light"] .btn-secondary:hover {
  background: #f4f4f5;
  border-color: rgba(0, 0, 0, 0.18);
}

[data-theme="light"] .btn-ghost:hover {
  background: rgba(0, 0, 0, 0.04);
}

[data-theme="light"] .btn-danger {
  background: rgba(239, 68, 68, 0.08);
  border-color: rgba(239, 68, 68, 0.18);
}

[data-theme="light"] .btn-danger:hover {
  background: rgba(239, 68, 68, 0.14);
}

/* Modal */
[data-theme="light"] .modal-overlay {
  background: rgba(255, 255, 255, 0.7);
}

[data-theme="light"] .modal {
  background: #ffffff;
  border-color: rgba(0, 0, 0, 0.1);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.12);
}

[data-theme="light"] .modal-header {
  background: rgba(255, 255, 255, 0.95);
  border-bottom-color: rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .modal-footer {
  border-top-color: rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .modal-close {
  background: #f4f4f5;
  border-color: rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .modal-close:hover {
  background: #e4e4e7;
}

/* Forms */
[data-theme="light"] .form-input,
[data-theme="light"] .form-select,
[data-theme="light"] .form-textarea {
  background: #ffffff;
  border-color: rgba(0, 0, 0, 0.12);
}

[data-theme="light"] .form-input:focus,
[data-theme="light"] .form-select:focus,
[data-theme="light"] .form-textarea:focus {
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

[data-theme="light"] .form-select option {
  background: #ffffff;
  color: #18181b;
}

/* Cards */
[data-theme="light"] .skill-card {
  background: rgba(255, 255, 255, 0.8);
  border-color: rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .skill-card:hover {
  background: #ffffff;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .manager-card {
  background: rgba(255, 255, 255, 0.6);
  border-color: rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .manager-card:hover {
  background: #ffffff;
  border-color: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .activity-card {
  background: rgba(255, 255, 255, 0.6);
  border-color: rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .activity-card:hover {
  background: #ffffff;
  border-color: rgba(0, 0, 0, 0.1);
}

/* Stat cards */
[data-theme="light"] .stat-card {
  background: rgba(255, 255, 255, 0.6);
  border-color: rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .stat-card:hover {
  background: #ffffff;
}

/* Toggle */
[data-theme="light"] .toggle-slider {
  background: #e4e4e7;
  border-color: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .toggle-slider::before {
  background: #a1a1aa;
}

[data-theme="light"] .toggle input:checked + .toggle-slider {
  background: rgba(37, 99, 235, 0.12);
  border-color: #2563eb;
}

[data-theme="light"] .toggle input:checked + .toggle-slider::before {
  background: #2563eb;
}

/* Toast */
[data-theme="light"] .toast {
  background: #ffffff;
  border-color: rgba(0, 0, 0, 0.1);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

/* Badges — light mode readable text */
[data-theme="light"] .badge-grammar       { color: #4338ca; }
[data-theme="light"] .badge-listening     { color: #0f766e; }
[data-theme="light"] .badge-speaking      { color: #b45309; }
[data-theme="light"] .badge-writing       { color: #be123c; }
[data-theme="light"] .badge-reading       { color: #0369a1; }
[data-theme="light"] .badge-pronunciation { color: #7e22ce; }
[data-theme="light"] .badge-success       { color: #16a34a; }
[data-theme="light"] .badge-neutral       { background: #f4f4f5; }

/* Filter chips */
[data-theme="light"] .filter-chip {
  background: #ffffff;
  border-color: rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .filter-chip.active {
  background: rgba(37, 99, 235, 0.08);
  color: #2563eb;
  border-color: rgba(37, 99, 235, 0.2);
}

/* Tab buttons */
[data-theme="light"] .tabs {
  background: #f4f4f5;
  border-color: rgba(0, 0, 0, 0.06);
}

[data-theme="light"] .tab-btn.active {
  background: rgba(37, 99, 235, 0.1);
  color: #2563eb;
  border-color: rgba(37, 99, 235, 0.2);
}

/* Password card */
[data-theme="light"] .password-card {
  background: #ffffff;
  border-color: rgba(0, 0, 0, 0.1);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .password-icon {
  box-shadow: 0 8px 30px rgba(37, 99, 235, 0.2);
}

/* File upload */
[data-theme="light"] .file-upload {
  border-color: rgba(0, 0, 0, 0.12);
}

[data-theme="light"] .file-upload:hover {
  border-color: #2563eb;
  background: rgba(37, 99, 235, 0.04);
}

/* Sidebar count */
[data-theme="light"] .sidebar-count {
  background: #f4f4f5;
  border-color: rgba(0, 0, 0, 0.06);
}

/* Curriculum card hover in light mode */
[data-theme="light"] .curriculum-week-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}