:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-2: #263348;
  --border: #334155;
  --text: #f8fafc;
  --muted: #94a3b8;
  --primary: #dc2626;
  --primary-dark: #991b1b;
  --gold: #f59e0b;
  --green: #10b981;
  --blue: #3b82f6;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  padding-bottom: env(safe-area-inset-bottom, 24px);
}
.ios-banner {
  background: #fef3c7;
  color: #78350f;
  padding: 10px 16px;
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid #f59e0b;
}
.ios-banner button { background: none; border: none; font-size: 16px; cursor: pointer; color: #78350f; font-weight: bold; }
.app-header {
  background: linear-gradient(180deg, #182235 0%, #0f172a 100%);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 40;
  padding-top: env(safe-area-inset-top, 0px);
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 12px 16px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-logo { border-radius: 10px; border: 1px solid var(--gold); }
.brand h1 { margin: 0; font-size: 18px; font-weight: 800; letter-spacing: -0.01em; }
.subtitle { margin: 2px 0 0; font-size: 12px; color: var(--muted); }
.status-group { display: flex; gap: 8px; flex-wrap: wrap; }
.badge { font-size: 11px; font-weight: 700; padding: 4px 10px; border-radius: 999px; }
.badge-online { background: rgba(16, 185, 129, 0.16); color: #34d399; border: 1px solid rgba(16, 185, 129, 0.4); }
.badge-offline { background: rgba(245, 158, 11, 0.2); color: #fbbf24; border: 1px solid rgba(245, 158, 11, 0.5); }
.badge-sw { background: rgba(59, 130, 246, 0.16); color: #60a5fa; border: 1px solid rgba(59, 130, 246, 0.4); }

.main-nav {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 16px 10px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}
.main-nav::-webkit-scrollbar { display: none; }
.nav-btn {
  background: var(--surface);
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s;
}
.nav-btn:hover { color: var(--text); border-color: #64748b; }
.nav-btn.active { background: var(--primary-dark); color: #fff; border-color: var(--gold); }

.container { max-width: 1280px; margin: 0 auto; padding: 20px 16px; }
.loading-box { text-align: center; padding: 48px; color: var(--muted); }

/* Controls & Filters */
.filter-bar {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
  margin-bottom: 16px;
}
input, select, textarea {
  width: 100%;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 9px 12px;
  font-size: 13px;
  font-family: inherit;
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--gold); }

.stats-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 13px;
  color: var(--muted);
}

/* Grid & Cards */
.events-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 14px;
}
.event-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 10px;
  transition: transform 0.15s, border-color 0.15s;
  cursor: pointer;
}
.event-card:hover { transform: translateY(-2px); border-color: var(--gold); }
.card-top { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.code-pill { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 11px; background: #0f172a; color: var(--gold); padding: 3px 8px; border-radius: 6px; border: 1px solid #334155; }
.event-title { margin: 0; font-size: 15px; font-weight: 700; color: #fff; }
.event-meta { font-size: 12px; color: var(--muted); display: flex; flex-direction: column; gap: 4px; }
.event-summary { font-size: 13px; color: #cbd5e1; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.tag-row { display: flex; flex-wrap: wrap; gap: 6px; }
.tag { font-size: 11px; padding: 2px 8px; border-radius: 6px; background: var(--surface-2); color: #e2e8f0; border: 1px solid var(--border); }
.tag-diff-hard { border-color: #ef4444; color: #fca5a5; }
.tag-diff-med { border-color: #f59e0b; color: #fcd34d; }
.tag-diff-easy { border-color: #10b981; color: #6ee7b7; }

/* Buttons */
.btn { border: none; border-radius: 9px; padding: 9px 15px; font-size: 13px; font-weight: 600; cursor: pointer; transition: opacity 0.15s; }
.btn:hover { opacity: 0.92; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-secondary { background: var(--blue); color: #fff; }
.btn-outline { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-sm { padding: 6px 11px; font-size: 12px; }
.btn-icon { background: var(--surface-2); color: var(--text); border: 1px solid var(--border); border-radius: 8px; width: 32px; height: 32px; cursor: pointer; }

/* Flashcard 3D */
.fc-wrap { max-width: 720px; margin: 0 auto; }
.flashcard {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 28px;
  min-height: 300px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 12px 30px rgba(0,0,0,0.35);
}
.sm2-bar { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 16px; }
.sm2-btn { padding: 10px 8px; border-radius: 10px; border: 1px solid var(--border); background: var(--surface-2); color: #fff; cursor: pointer; font-size: 12px; font-weight: 700; }
.sm2-btn small { display: block; font-weight: 400; color: var(--muted); margin-top: 2px; }

/* Quiz */
.quiz-box { max-width: 760px; margin: 0 auto; background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 24px; }
.option-btn { display: block; width: 100%; text-align: left; background: var(--bg); color: var(--text); border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; margin-bottom: 10px; cursor: pointer; font-size: 14px; }
.option-btn:hover { border-color: var(--gold); }
.option-btn.correct { background: rgba(16, 185, 129, 0.2); border-color: #10b981; }
.option-btn.wrong { background: rgba(239, 68, 68, 0.2); border-color: #ef4444; }

/* Modal */
.modal-backdrop { position: fixed; inset: 0; background: rgba(2, 6, 23, 0.8); z-index: 60; display: flex; align-items: center; justify-content: center; padding: 16px; }
.modal-card { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; max-width: 780px; width: 100%; max-height: 90vh; overflow-y: auto; padding: 22px; }
.modal-header { display: flex; justify-content: space-between; align-items: center; }
.modal-title { margin: 10px 0; font-size: 20px; }
.modal-body { margin-top: 14px; font-size: 14px; color: #e2e8f0; display: flex; flex-direction: column; gap: 10px; }
.field-block { background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; }
.field-label { font-size: 11px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--gold); font-weight: 700; margin-bottom: 4px; }
.modal-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.note-box { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--border); display: flex; flex-direction: column; gap: 8px; }

/* Taxonomy & Analytics Grid */
.panel-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; }
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 18px; }
.stat-num { font-size: 28px; font-weight: 800; color: var(--gold); }
.pagination { display: flex; justify-content: center; align-items: center; gap: 10px; margin-top: 20px; }