/* css/pp-new.css — shared design system for the new feature pages
   (doubts, classes, tests, copyright, school-signup, admin-moderation). */

:root {
  --pp-bg: #f8fafc;
  --pp-surface: #ffffff;
  --pp-border: #e5e7eb;
  --pp-text: #0f172a;
  --pp-muted: #64748b;
  --pp-primary: #2563eb;
  --pp-primary-700: #1d4ed8;
  --pp-success: #10b981;
  --pp-warning: #f59e0b;
  --pp-danger: #ef4444;
  --pp-radius: 12px;
  --pp-radius-sm: 8px;
  --pp-shadow: 0 1px 3px rgba(15, 23, 42, 0.06), 0 4px 12px rgba(15, 23, 42, 0.04);
  --pp-shadow-lg: 0 10px 30px rgba(15, 23, 42, 0.08);
}

* { box-sizing: border-box; }

body.pp-page {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--pp-bg);
  color: var(--pp-text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  padding-top: 64px; /* room for sticky nav */
}

/* ── Top navbar ─────────────────────────────────────────── */
.pp-nav {
  position: fixed; top: 0; left: 0; right: 0; height: 64px;
  background: var(--pp-surface);
  border-bottom: 1px solid var(--pp-border);
  z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px;
  box-shadow: 0 1px 0 rgba(15,23,42,.04);
}
.pp-nav-brand {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; color: var(--pp-text); font-weight: 700;
  font-size: 18px;
}
.pp-nav-brand i { color: var(--pp-primary); font-size: 22px; }
.pp-nav-links { display: flex; align-items: center; gap: 6px; }
.pp-nav-links a {
  text-decoration: none;
  color: var(--pp-muted);
  font-weight: 500;
  font-size: 14px;
  padding: 8px 14px;
  border-radius: 8px;
  transition: background 0.15s, color 0.15s;
  display: inline-flex; align-items: center; gap: 6px;
}
.pp-nav-links a:hover { background: #f1f5f9; color: var(--pp-text); }
.pp-nav-links a.active { background: #eff6ff; color: var(--pp-primary); }
.pp-nav-cta {
  background: var(--pp-primary); color: #fff !important; padding: 8px 16px !important;
}
.pp-nav-cta:hover { background: var(--pp-primary-700) !important; }
.pp-nav-avatar {
  width: 36px; height: 36px; border-radius: 50%; object-fit: cover;
  border: 2px solid var(--pp-border); margin-left: 8px;
}
.pp-nav-toggle { display: none; background: none; border: 0; cursor: pointer; font-size: 22px; color: var(--pp-text); }

@media (max-width: 880px) {
  .pp-nav-links {
    position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--pp-surface); border-bottom: 1px solid var(--pp-border);
    padding: 8px 16px 16px; display: none;
  }
  .pp-nav-links.open { display: flex; }
  .pp-nav-links a { padding: 12px 14px; border-radius: 6px; }
  .pp-nav-toggle { display: inline-flex; }
}

/* ── Layout ─────────────────────────────────────────────── */
.pp-container { max-width: 1100px; margin: 0 auto; padding: 28px 22px; }
.pp-container.narrow { max-width: 720px; }

.pp-header {
  display: flex; justify-content: space-between; align-items: flex-start;
  margin-bottom: 22px; gap: 16px; flex-wrap: wrap;
}
.pp-header h1 { font-size: 28px; margin: 0 0 4px; letter-spacing: -0.02em; }
.pp-header p { color: var(--pp-muted); margin: 0; font-size: 15px; }

/* ── Cards ──────────────────────────────────────────────── */
.pp-card {
  background: var(--pp-surface); border: 1px solid var(--pp-border);
  border-radius: var(--pp-radius); padding: 22px; box-shadow: var(--pp-shadow);
  margin-bottom: 18px;
}
.pp-card.compact { padding: 16px; }
.pp-card h2, .pp-card h3 { margin-top: 0; letter-spacing: -0.01em; }
.pp-card h2 { font-size: 20px; margin-bottom: 14px; }
.pp-card h3 { font-size: 16px; color: var(--pp-text); margin-bottom: 10px; }

/* ── Inputs ─────────────────────────────────────────────── */
.pp-label {
  display: block; font-size: 13px; font-weight: 600; color: var(--pp-text);
  margin: 14px 0 6px;
}
.pp-input, .pp-textarea, .pp-select {
  width: 100%; padding: 11px 13px;
  border: 1px solid var(--pp-border); border-radius: var(--pp-radius-sm);
  background: var(--pp-surface); color: var(--pp-text);
  font-family: inherit; font-size: 14px;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.pp-input:focus, .pp-textarea:focus, .pp-select:focus {
  outline: none; border-color: var(--pp-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}
.pp-textarea { resize: vertical; min-height: 96px; }

/* ── Buttons ────────────────────────────────────────────── */
.pp-btn {
  display: inline-flex; align-items: center; gap: 8px; justify-content: center;
  padding: 10px 18px; border-radius: var(--pp-radius-sm); border: 1px solid var(--pp-primary);
  background: var(--pp-primary); color: #fff; font-weight: 600; font-size: 14px;
  cursor: pointer; text-decoration: none; transition: filter .15s, transform .05s;
  font-family: inherit;
}
.pp-btn:hover { filter: brightness(1.07); }
.pp-btn:active { transform: translateY(1px); }
.pp-btn:disabled { opacity: .55; cursor: not-allowed; }
.pp-btn.secondary { background: var(--pp-surface); color: var(--pp-text); border-color: var(--pp-border); }
.pp-btn.secondary:hover { background: #f8fafc; }
.pp-btn.success { background: var(--pp-success); border-color: var(--pp-success); }
.pp-btn.danger  { background: var(--pp-danger);  border-color: var(--pp-danger); }
.pp-btn.ghost   { background: transparent; color: var(--pp-primary); border-color: transparent; }
.pp-btn.lg { padding: 13px 22px; font-size: 15px; }
.pp-btn.sm { padding: 6px 12px; font-size: 13px; }

/* ── Pills / badges ─────────────────────────────────────── */
.pp-pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 10px; border-radius: 999px; font-size: 12px; font-weight: 600;
  background: #f1f5f9; color: var(--pp-text);
}
.pp-pill.primary { background: #eff6ff; color: var(--pp-primary); }
.pp-pill.success { background: #ecfdf5; color: #047857; }
.pp-pill.warning { background: #fffbeb; color: #b45309; }
.pp-pill.danger  { background: #fef2f2; color: #b91c1c; }

/* ── List rows ──────────────────────────────────────────── */
.pp-list { display: flex; flex-direction: column; gap: 10px; }
.pp-row {
  background: var(--pp-surface); border: 1px solid var(--pp-border);
  border-radius: var(--pp-radius-sm); padding: 14px 16px;
  display: flex; gap: 14px; align-items: flex-start; transition: transform .12s, box-shadow .12s, border-color .12s;
}
.pp-row:hover { transform: translateY(-1px); border-color: #d1d5db; box-shadow: var(--pp-shadow); }
.pp-row.clickable { cursor: pointer; }
.pp-row .pp-row-main { flex: 1; min-width: 0; }
.pp-row .pp-row-title { font-weight: 600; color: var(--pp-text); margin: 0 0 4px; }
.pp-row .pp-row-sub { color: var(--pp-muted); font-size: 13px; margin: 0; }
.pp-row .pp-row-actions { display: flex; gap: 6px; align-items: center; flex-shrink: 0; }

/* ── Empty states ───────────────────────────────────────── */
.pp-empty {
  text-align: center; padding: 50px 20px; color: var(--pp-muted);
  border: 2px dashed var(--pp-border); border-radius: var(--pp-radius);
  background: var(--pp-surface);
}
.pp-empty i { font-size: 36px; opacity: .35; margin-bottom: 10px; display: block; }

/* ── Banners ────────────────────────────────────────────── */
.pp-banner {
  padding: 14px 18px; border-radius: var(--pp-radius-sm); margin-bottom: 18px;
  display: flex; gap: 12px; align-items: flex-start; font-size: 14px;
}
.pp-banner.info    { background: #eff6ff; border: 1px solid #bfdbfe; color: #1e40af; }
.pp-banner.warning { background: #fffbeb; border: 1px solid #fde68a; color: #92400e; }
.pp-banner.danger  { background: #fef2f2; border: 1px solid #fecaca; color: #991b1b; }
.pp-banner.success { background: #ecfdf5; border: 1px solid #a7f3d0; color: #065f46; }

/* ── Grid ───────────────────────────────────────────────── */
.pp-grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.pp-grid-2 { display: grid; gap: 18px; grid-template-columns: 1fr 1fr; }
@media (max-width: 720px) { .pp-grid-2 { grid-template-columns: 1fr; } }

/* ── Modal ──────────────────────────────────────────────── */
.pp-modal-backdrop {
  position: fixed; inset: 0; background: rgba(15, 23, 42, 0.55);
  display: none; align-items: center; justify-content: center;
  padding: 16px; z-index: 9999;
  backdrop-filter: blur(4px);
}
.pp-modal-backdrop.open { display: flex; }
.pp-modal {
  background: var(--pp-surface); border-radius: var(--pp-radius);
  max-width: 680px; width: 100%; max-height: 90vh; overflow: auto;
  box-shadow: var(--pp-shadow-lg); padding: 24px; position: relative;
}
.pp-modal-close {
  position: absolute; top: 12px; right: 16px;
  background: none; border: 0; font-size: 26px; cursor: pointer; color: var(--pp-muted);
}
.pp-modal-close:hover { color: var(--pp-text); }

/* ── Chat ───────────────────────────────────────────────── */
.pp-chat-box {
  height: 60vh; min-height: 320px; overflow-y: auto;
  border: 1px solid var(--pp-border); border-radius: var(--pp-radius-sm);
  padding: 16px; background: #f9fafb; display: flex; flex-direction: column; gap: 8px;
}
.pp-msg {
  background: var(--pp-surface); border: 1px solid var(--pp-border);
  padding: 10px 14px; border-radius: 12px; max-width: 75%;
  align-self: flex-start;
}
.pp-msg.mine { align-self: flex-end; background: var(--pp-primary); color: #fff; border-color: var(--pp-primary); }
.pp-msg-who { font-size: 11px; color: var(--pp-muted); margin-bottom: 2px; font-weight: 600; }
.pp-msg.mine .pp-msg-who { color: rgba(255,255,255,.7); }

/* ── Skeleton loader ────────────────────────────────────── */
.pp-skel {
  background: linear-gradient(90deg, #f1f5f9, #e2e8f0, #f1f5f9);
  background-size: 200% 100%;
  animation: pp-skel 1.4s ease-in-out infinite;
  border-radius: 6px;
}
@keyframes pp-skel {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ── Class / test hub cards ─────────────────────────────── */
.pp-class-card {
  background: var(--pp-surface);
  border: 1px solid var(--pp-border);
  border-radius: var(--pp-radius);
  padding: 20px;
  transition: transform .15s, box-shadow .15s, border-color .15s;
  display: flex; flex-direction: column; gap: 12px;
}
.pp-class-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--pp-shadow-lg);
  border-color: #cbd5e1;
}
.pp-class-card .meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.pp-class-card h3 { margin: 0; font-size: 18px; }
.pp-class-card .actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: auto; }

.pp-student-row {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 14px; border: 1px solid var(--pp-border);
  border-radius: var(--pp-radius-sm); background: var(--pp-surface);
  margin-bottom: 8px;
}
.pp-student-row.disabled { opacity: .55; background: #f8fafc; }
.pp-student-avatar {
  width: 40px; height: 40px; border-radius: 50%;
  background: linear-gradient(135deg, #dbeafe, #e0e7ff);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; color: var(--pp-primary); flex-shrink: 0;
}
.pp-student-info { flex: 1; min-width: 0; }
.pp-student-info strong { display: block; font-size: 14px; }
.pp-student-info span { font-size: 12px; color: var(--pp-muted); }

.pp-check-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 8px; max-height: 280px; overflow-y: auto;
  padding: 12px; border: 1px solid var(--pp-border); border-radius: var(--pp-radius-sm);
  background: #f8fafc;
}
.pp-check-item {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 10px; border-radius: 6px; cursor: pointer;
  background: var(--pp-surface); border: 1px solid var(--pp-border);
  font-size: 13px;
}
.pp-check-item:has(input:checked) { border-color: var(--pp-primary); background: #eff6ff; }
.pp-check-item input { accent-color: var(--pp-primary); }

.pp-split { display: grid; grid-template-columns: 1fr 380px; gap: 22px; align-items: start; }
@media (max-width: 960px) { .pp-split { grid-template-columns: 1fr; } }

.pp-tabs { display: flex; gap: 4px; background: #f1f5f9; padding: 4px; border-radius: 10px; margin-bottom: 18px; }
.pp-tab {
  flex: 1; padding: 10px 14px; border: 0; background: transparent;
  border-radius: 8px; font-weight: 600; font-size: 14px; color: var(--pp-muted);
  cursor: pointer; transition: background .12s, color .12s;
}
.pp-tab.active { background: var(--pp-surface); color: var(--pp-text); box-shadow: var(--pp-shadow); }

.pp-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.pp-table th { text-align: left; padding: 10px 12px; color: var(--pp-muted); font-weight: 600; border-bottom: 1px solid var(--pp-border); }
.pp-table td { padding: 12px; border-bottom: 1px solid #f1f5f9; vertical-align: middle; }

.pp-fab-row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }