/* ===== APP SHELL ===== */
.app-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
}

.app-nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  height: 60px;
  gap: 32px;
}

.app-nav-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--fg);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.app-nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.app-nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--fg-muted);
  text-decoration: none;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: color 0.15s, background 0.15s;
}

.app-nav-link:hover, .app-nav-link.active {
  color: var(--fg);
  background: var(--bg-elevated);
}

.app-nav-cta {
  font-size: 0.88rem;
  font-weight: 600;
  font-family: var(--font-display);
  color: var(--bg);
  background: var(--accent);
  text-decoration: none;
  padding: 7px 16px;
  border-radius: var(--radius-sm);
  margin-left: 12px;
  transition: opacity 0.15s;
}

.app-nav-cta:hover { opacity: 0.85; }

.app-main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 48px 24px 80px;
}

/* ===== PAGE HEADER ===== */
.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 40px;
  gap: 24px;
}

.page-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  color: var(--fg);
  margin-bottom: 6px;
}

.page-sub {
  color: var(--fg-muted);
  font-size: 0.95rem;
}

.back-link {
  display: inline-block;
  color: var(--fg-dim);
  font-size: 0.88rem;
  text-decoration: none;
  margin-bottom: 12px;
  transition: color 0.15s;
}

.back-link:hover { color: var(--fg-muted); }

/* ===== BUTTONS ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--bg);
  background: var(--accent);
  text-decoration: none;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: opacity 0.15s;
  white-space: nowrap;
}
.btn-primary:hover { opacity: 0.85; }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--fg-muted);
  background: transparent;
  text-decoration: none;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}
.btn-ghost:hover { border-color: rgba(255,255,255,0.15); color: var(--fg); }

.btn-sm {
  display: inline-flex;
  align-items: center;
  font-size: 0.82rem;
  font-weight: 500;
  text-decoration: none;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: opacity 0.15s;
}

.btn-accent { color: var(--bg); background: var(--accent); }
.btn-accent:hover { opacity: 0.85; }
.btn-danger { color: #f87171; background: rgba(248,113,113,0.12); }
.btn-danger:hover { background: rgba(248,113,113,0.2); }

/* ===== ALERTS ===== */
.alert-error {
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid rgba(248, 113, 113, 0.25);
  color: #fca5a5;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 24px;
  font-size: 0.92rem;
}

.alert-info {
  background: var(--blue-dim);
  border: 1px solid rgba(96,165,250,0.2);
  color: var(--blue);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 24px;
  font-size: 0.92rem;
}

.alert-link { color: inherit; font-weight: 600; }

/* ===== EMPTY STATE ===== */
.empty-state {
  text-align: center;
  padding: 80px 24px;
  color: var(--fg-muted);
}

.empty-icon { font-size: 3rem; margin-bottom: 16px; }

.empty-state h3 {
  font-size: 1.2rem;
  color: var(--fg);
  margin-bottom: 8px;
}

.empty-state p { font-size: 0.95rem; }

/* ===== STUDENT GRID ===== */
.student-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.student-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: border-color 0.2s;
}
.student-card:hover { border-color: rgba(110,231,183,0.15); }

.student-card-header {
  display: flex;
  align-items: center;
  gap: 14px;
}

.student-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent-dim);
  color: var(--accent);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.student-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  color: var(--fg);
}

.student-grade {
  font-size: 0.82rem;
  color: var(--fg-dim);
  margin-top: 2px;
}

.student-goals-preview {
  font-size: 0.88rem;
  color: var(--fg-muted);
  line-height: 1.55;
  flex: 1;
}

.student-goals-preview.muted { color: var(--fg-dim); font-style: italic; }

.student-card-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

/* ===== SESSIONS LIST ===== */
.sessions-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.session-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: border-color 0.15s, background 0.15s;
  gap: 16px;
}
.session-row:hover { border-color: rgba(110,231,183,0.15); background: var(--bg-elevated); }

.session-row-left {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.session-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--blue-dim);
  color: var(--blue);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.session-student {
  font-weight: 600;
  font-family: var(--font-display);
  font-size: 0.95rem;
  color: var(--fg);
}

.session-preview {
  font-size: 0.82rem;
  color: var(--fg-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 400px;
}

.session-row-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.session-date {
  font-size: 0.85rem;
  color: var(--fg-dim);
}

.session-badge {
  font-size: 0.75rem;
  font-weight: 600;
  font-family: var(--font-display);
  padding: 3px 10px;
  border-radius: 100px;
  background: var(--accent-dim);
  color: var(--accent);
}

.session-badge.pending {
  background: var(--blue-dim);
  color: var(--blue);
}

/* ===== SESSION VIEW ===== */
.session-layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 24px;
  align-items: start;
}

.summary-card {
  background: var(--bg-card);
  border: 1px solid rgba(110,231,183,0.2);
  border-radius: var(--radius);
  padding: 32px;
}

.summary-card.generating {
  border-color: var(--border);
}

.summary-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.ai-badge {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 4px 10px;
  border-radius: 100px;
}

.generating-label {
  font-size: 0.85rem;
  color: var(--fg-dim);
}

.summary-body {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.summary-body p {
  font-size: 0.95rem;
  color: var(--fg-muted);
  line-height: 1.7;
}

.summary-body strong {
  color: var(--fg);
  font-family: var(--font-display);
}

.copy-btn {
  margin-top: 24px;
  display: inline-flex;
  align-items: center;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-dim);
  border: none;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: opacity 0.15s;
}
.copy-btn:hover { opacity: 0.8; }

.summary-placeholder {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.placeholder-line {
  height: 12px;
  background: var(--border);
  border-radius: 6px;
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.generating-hint {
  font-size: 0.88rem;
  color: var(--fg-dim);
  line-height: 1.6;
}

/* Notes sidebar */
.notes-panel {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.notes-panel-title {
  font-size: 0.88rem;
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--fg-dim);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.notes-section { display: flex; flex-direction: column; gap: 6px; }

.notes-label {
  font-size: 0.78rem;
  font-weight: 600;
  font-family: var(--font-display);
  color: var(--fg-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.notes-content {
  font-size: 0.9rem;
  color: var(--fg-muted);
  line-height: 1.6;
}

/* ===== FORMS ===== */
.form-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
  max-width: 700px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 24px;
}

.form-label {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--fg);
}

.required { color: var(--accent); }
.optional { color: var(--fg-dim); font-weight: 400; font-size: 0.85em; }

.form-hint {
  font-size: 0.83rem;
  color: var(--fg-dim);
  line-height: 1.5;
  margin-top: -4px;
}

.form-input, .form-textarea, .form-select {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 10px 14px;
  width: 100%;
  transition: border-color 0.15s;
  -webkit-appearance: none;
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
  outline: none;
  border-color: rgba(110,231,183,0.4);
}

.form-input::placeholder, .form-textarea::placeholder { color: var(--fg-dim); }

.form-textarea { resize: vertical; min-height: 80px; line-height: 1.6; }

.form-select { cursor: pointer; }

.form-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 8px;
}

/* AI notice in form */
.ai-notice {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: var(--accent-glow);
  border: 1px solid rgba(110,231,183,0.15);
  border-radius: var(--radius-sm);
  margin-bottom: 24px;
  font-size: 0.88rem;
  color: var(--fg-muted);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .session-layout {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .form-card {
    padding: 24px;
  }

  .session-preview { display: none; }

  .app-nav-cta { display: none; }
}

@media (max-width: 480px) {
  .page-header { flex-direction: column; }
  .app-main { padding: 32px 16px 60px; }
}