/* === Base & Variables === */
:root {
  --f-title: 'Pirata One', cursive;
  --f-disp: 'Bebas Neue', sans-serif;
  --f-body: 'Crimson Pro', Georgia, serif;
  --f-mono: 'Share Tech Mono', monospace;
  --gold: #f5c84a;
  --gold-bright: #ffe566;
  --gold-muted: #c8953a;
  --gold-dim: #8a6020;
  --red: #d42828;
  --cream: #f4e8d0;
  --sea-deep: #0a1628;
  --sea-mid: #0e2244;
  --ease-cine: cubic-bezier(0.85, 0, 0.15, 1);
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--sea-deep); color: var(--cream);
  font-family: var(--f-body); min-height: 100vh; overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--gold); color: #000; }
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(245, 200, 74, 0.1); border-radius: 4px; }
:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; }

/* === Layout === */
.container { max-width: 1200px; margin: 0 auto; padding: 36px 28px; }

header { text-align: center; margin-bottom: 32px; }
header h1 {
  font-family: var(--f-title); font-size: clamp(2.2rem, 4vw, 3rem);
  letter-spacing: 3px; color: var(--gold); line-height: 1.1;
}
header p {
  font-family: var(--f-mono); font-size: 0.6rem; letter-spacing: 4px;
  color: var(--gold-muted); margin-top: 6px; text-transform: uppercase;
}

.app-layout {
  display: grid; grid-template-columns: 1fr 1.1fr; gap: 28px;
  transition: grid-template-columns 0.3s var(--ease-cine);
}
.app-layout.single-col { grid-template-columns: 1fr; }
.app-layout.single-col > .preview-col { display: none; }
.app-layout > section { display: flex; flex-direction: column; }
.app-layout > section > .card { flex: 1; }
.app-layout > section.tab-panel { display: none; }
.app-layout > section.tab-panel.active { display: flex; flex-direction: column; }

.full-width-panel {
  display: none;
}
.full-width-panel.active {
  display: block;
}

/* === Tabs === */
.tab-bar {
  display: flex; gap: 0; margin-bottom: 28px;
  border-bottom: 1px solid rgba(245, 200, 74, 0.08);
}
.tab-btn {
  font-family: var(--f-disp); font-size: 0.9rem; letter-spacing: 3px;
  padding: 12px 28px; border: none; background: transparent;
  color: var(--gold-dim); cursor: pointer; position: relative;
  transition: color 0.3s var(--ease-cine);
}
.tab-btn:hover { color: var(--gold-muted); }
.tab-btn.active { color: var(--gold); }
.tab-btn.active::after {
  content: ''; position: absolute; bottom: -1px; left: 0; right: 0;
  height: 2px; background: var(--gold);
}

/* === Cards === */
.card {
  background: var(--sea-mid); border: 1px solid rgba(245, 200, 74, 0.07);
  transition: border-color 0.4s var(--ease-cine); overflow: hidden;
}
.card:hover { border-color: rgba(245, 200, 74, 0.15); }
.card-header {
  padding: 18px 24px 14px; display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid rgba(245, 200, 74, 0.06);
}
.card-header h2 {
  font-family: var(--f-disp); font-size: 0.85rem; letter-spacing: 3px;
  color: var(--gold-muted); display: flex; align-items: center; gap: 8px;
}
.card-body { padding: 24px; }

/* === Forms === */
.form-group { margin-bottom: 20px; }
.form-label {
  display: block; font-family: var(--f-mono); font-size: 0.6rem;
  letter-spacing: 3px; color: var(--gold-muted); margin-bottom: 6px; text-transform: uppercase;
}
.form-input, .form-select {
  width: 100%; padding: 12px 16px; background: rgba(10, 22, 40, 0.5);
  border: 1px solid rgba(245, 200, 74, 0.08); color: var(--cream);
  font-size: 1rem; font-family: var(--f-body);
  transition: border-color 0.3s var(--ease-cine); outline: none; appearance: none;
}
.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23c8953a' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 14px center; padding-right: 40px;
}
.form-input:hover, .form-select:hover { border-color: rgba(245, 200, 74, 0.15); }
.form-input:focus, .form-select:focus { border-color: var(--gold); background: rgba(245, 200, 74, 0.04); }
.form-input::placeholder { color: rgba(244, 232, 208, 0.2); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

.topics-list {
  display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px;
  overflow-y: auto; max-height: 240px;
}
.topic-row {
  display: flex; align-items: center; gap: 8px; padding: 4px 4px 4px 10px;
  background: rgba(10, 22, 40, 0.3); border: 1px solid rgba(245, 200, 74, 0.06);
  transition: border-color 0.3s var(--ease-cine); cursor: grab;
}
.topic-row:hover { border-color: rgba(245, 200, 74, 0.12); background: rgba(10, 22, 40, 0.5); }
.topic-row.dragging { opacity: 0.3; }
.topic-row.drag-over { border-color: var(--gold); background: rgba(245, 200, 74, 0.06); }
.topic-row .drag-handle { color: var(--gold-dim); font-size: 13px; padding: 4px; user-select: none; flex-shrink: 0; cursor: grab; }
.topic-input {
  flex: 1; padding: 9px 12px; background: transparent; border: none;
  color: var(--cream); font-size: 1rem; font-family: var(--f-body); outline: none;
}
.topic-input::placeholder { color: rgba(244, 232, 208, 0.15); }
.topic-remove {
  width: 26px; height: 26px; border: none; background: transparent;
  color: rgba(244, 232, 208, 0.2); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; transition: 0.2s; flex-shrink: 0;
}
.topic-remove:hover { color: var(--red); background: rgba(212, 40, 40, 0.1); }
.topic-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.char-count { font-family: var(--f-mono); font-size: 0.5rem; letter-spacing: 1.5px; color: var(--gold-dim); text-align: right; margin-top: 6px; }
.char-count.warning { color: var(--gold-muted); }
.char-count.danger { color: var(--red); }
.kbd-hint { font-family: var(--f-mono); font-size: 0.45rem; letter-spacing: 1.5px; color: var(--gold-dim); display: flex; align-items: center; gap: 4px; }

/* === Buttons === */
.btn {
  display: inline-flex; align-items: center; gap: 7px; padding: 10px 18px;
  border: none; font-family: var(--f-disp); font-size: 0.75rem;
  letter-spacing: 2.5px; cursor: pointer; transition: all 0.3s var(--ease-cine);
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--gold); color: #000; box-shadow: 0 4px 16px rgba(245, 200, 74, 0.2); }
.btn-primary:hover { background: var(--gold-bright); box-shadow: 0 8px 24px rgba(245, 200, 74, 0.3); }
.btn-secondary { background: rgba(245, 200, 74, 0.04); color: var(--cream); border: 1px solid rgba(245, 200, 74, 0.08); }
.btn-secondary:hover { background: rgba(245, 200, 74, 0.08); border-color: rgba(245, 200, 74, 0.15); }
.btn-ghost { background: transparent; color: var(--gold-muted); padding: 8px 12px; font-size: 0.65rem; }
.btn-ghost:hover { color: var(--gold); background: rgba(245, 200, 74, 0.04); }
.btn-danger { background: rgba(212, 40, 40, 0.1); color: var(--red); border: 1px solid rgba(212, 40, 40, 0.15); }
.btn-danger:hover { background: rgba(212, 40, 40, 0.2); }

.form-actions { display: flex; flex-wrap: wrap; gap: 10px; padding-top: 18px; margin-top: 20px; border-top: 1px solid rgba(245, 200, 74, 0.06); }

/* === Preview === */
.preview-card { display: flex; flex-direction: column; }
.output-content { padding: 24px; flex: 1; overflow-y: auto; min-height: 0; }
.output-empty { display: flex; flex-direction: column; align-items: center; justify-content: center; height: 100%; min-height: 280px; text-align: center; gap: 12px; }
.output-empty .empty-icon { font-size: 36px; opacity: 0.2; }
.output-empty p { font-family: var(--f-mono); font-size: 0.65rem; letter-spacing: 2px; color: var(--gold-dim); }
.output-pre { font-family: var(--f-body); white-space: pre-wrap; word-wrap: break-word; margin: 0; font-size: 1rem; line-height: 2; color: var(--cream); }
.output-footer { display: flex; align-items: center; justify-content: space-between; padding: 12px 24px; border-top: 1px solid rgba(245, 200, 74, 0.06); }
.output-footer-hint { font-family: var(--f-mono); font-size: 0.5rem; letter-spacing: 2px; color: var(--gold-dim); }

/* === History & Drafts === */
.history-category { margin-bottom: 20px; }
.history-category-header {
  font-family: var(--f-disp); font-size: 0.9rem; letter-spacing: 3px;
  color: var(--gold); padding-bottom: 8px;
  border-bottom: 1px solid rgba(245, 200, 74, 0.06); margin-bottom: 10px;
}
.history-entry {
  display: flex; justify-content: space-between; align-items: flex-start;
  padding: 10px 14px; background: rgba(10, 22, 40, 0.3);
  border: 1px solid rgba(245, 200, 74, 0.04); margin-bottom: 6px;
  transition: border-color 0.3s var(--ease-cine);
}
.history-entry:hover { border-color: rgba(245, 200, 74, 0.1); }
.history-entry-left { flex: 1; }
.history-entry-date { font-family: var(--f-mono); font-size: 0.62rem; letter-spacing: 1.5px; color: var(--gold-dim); }
.history-entry-topics { font-family: var(--f-body); font-size: 0.9rem; line-height: 1.5; letter-spacing: 0.3px; color: var(--cream); margin-top: 4px; }
.history-entry-actions { display: flex; gap: 6px; flex-shrink: 0; margin-left: 12px; }
.history-entry-actions .btn { padding: 4px 10px; font-size: 0.55rem; }
.history-empty {
  text-align: center; padding: 40px 16px;
  font-family: var(--f-mono); font-size: 0.55rem; letter-spacing: 2px; color: var(--gold-dim);
}

/* History filters + grouped tree (Teacher -> Subject -> Date -> Topics) */
.history-filters {
  display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px;
  padding: 12px; background: rgba(10, 22, 40, 0.35);
  border: 1px solid rgba(245, 200, 74, 0.06); border-radius: 8px;
}
.history-filters .form-select,
.history-filters .form-input { flex: 1 1 140px; min-width: 120px; }
.history-filters .form-input { flex: 2 1 180px; }
.history-filters .btn { flex-shrink: 0; }

.history-list { display: flex; flex-direction: column; gap: 14px; }
.h-group > summary,
.h-sub > summary,
.h-date > summary {
  cursor: pointer; list-style: none; user-select: none;
  display: flex; align-items: center; gap: 6px;
  font-family: var(--f-disp);
}
.h-group > summary::-webkit-details-marker,
.h-sub > summary::-webkit-details-marker,
.h-date > summary::-webkit-details-marker { display: none; }
.h-group > summary { font-size: 1.15rem; letter-spacing: 2px; color: var(--gold); padding: 6px 0; border-bottom: 1px solid rgba(245, 200, 74, 0.12); }
.h-sub > summary { font-size: 1rem; letter-spacing: 2px; color: var(--cream); margin-top: 10px; padding-left: 16px; }
.h-date > summary { font-size: 0.9rem; letter-spacing: 1px; color: var(--gold-muted); margin-top: 8px; padding-left: 36px; }
.h-count { font-family: var(--f-mono); font-size: 0.55rem; letter-spacing: 1.5px; color: var(--gold-dim); }
.h-date-entries { padding-left: 52px; margin-top: 8px; }
.history-clear { text-align: center; margin-top: 20px; }

.item-list { display: flex; flex-direction: column; gap: 8px; margin-top: 16px; max-height: 300px; overflow-y: auto; }
.item-card {
  padding: 14px 16px; background: rgba(10, 22, 40, 0.4);
  border: 1px solid rgba(245, 200, 74, 0.06); cursor: pointer;
  transition: border-color 0.3s var(--ease-cine);
}
.item-card:hover { border-color: rgba(245, 200, 74, 0.15); }
.item-card-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; }
.item-card-title {
  font-family: var(--f-disp); font-size: 0.8rem; letter-spacing: 2px; color: var(--cream);
}
.item-card-sub {
  font-family: var(--f-mono); font-size: 0.5rem; letter-spacing: 1.5px;
  color: var(--gold-dim); margin-top: 4px;
}
.item-card-topics {
  font-family: var(--f-mono); font-size: 0.5rem; letter-spacing: 1px;
  color: var(--gold-muted); margin-top: 6px; overflow: hidden;
  text-overflow: ellipsis; white-space: nowrap;
}
.item-card-actions { display: flex; gap: 6px; flex-shrink: 0; }
.item-card-actions .btn { padding: 4px 10px; font-size: 0.55rem; }

/* === Toasts === */
.toast-container { position: fixed; bottom: 24px; right: 24px; z-index: 1000; display: flex; flex-direction: column; gap: 8px; }
.toast {
  padding: 12px 20px; background: rgba(10, 22, 40, 0.96);
  border: 1px solid rgba(245, 200, 74, 0.08);
  font-family: var(--f-mono); font-size: 0.55rem; letter-spacing: 2px;
  color: var(--cream); display: flex; align-items: center; gap: 10px;
  animation: toastIn 0.25s ease, toastOut 0.3s ease 2.2s forwards;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
}
.toast-icon { width: 20px; height: 20px; border: 1px solid var(--gold-dim); color: var(--gold); display: flex; align-items: center; justify-content: center; font-size: 8px; flex-shrink: 0; }
@keyframes toastIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
@keyframes toastOut { from { opacity: 1; } to { opacity: 0; transform: translateY(-4px); } }

/* === Admin === */
.admin-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.admin-section { margin-bottom: 0; }
.admin-section-title {
  font-family: var(--f-disp); font-size: 0.8rem; letter-spacing: 3px;
  color: var(--gold); margin-bottom: 12px; padding-bottom: 8px;
  border-bottom: 1px solid rgba(245, 200, 74, 0.08);
}
.admin-add-row { display: flex; gap: 8px; margin-bottom: 12px; }
.admin-add-row .form-input { flex: 1; }
.admin-add-row .btn { flex-shrink: 0; }
.admin-item-list { display: flex; flex-direction: column; gap: 6px; max-height: 250px; overflow-y: auto; }
.admin-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 12px; background: rgba(10, 22, 40, 0.3);
  border: 1px solid rgba(245, 200, 74, 0.04);
  transition: border-color 0.3s var(--ease-cine);
}
.admin-item:hover { border-color: rgba(245, 200, 74, 0.1); }
.admin-item-name { font-family: var(--f-body); font-size: 0.9rem; color: var(--cream); }
.admin-item-actions { display: flex; gap: 6px; }
.admin-item-actions .btn { padding: 4px 10px; font-size: 0.55rem; }
.admin-accounts { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; }
.admin-sub-block { background: rgba(10, 22, 40, 0.3); border: 1px solid rgba(245, 200, 74, 0.06); border-radius: 8px; padding: 16px; }
.admin-sub-block .admin-section-title { margin-bottom: 12px; }
.admin-sub-block .btn { margin-top: 4px; }

/* === Migration Banner === */
.migrate-banner {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 16px; max-width: 1200px; margin: 0 auto 24px; padding: 16px 24px;
  background: var(--sea-mid); border: 1px solid rgba(245, 200, 74, 0.15);
  color: var(--cream); font-family: var(--f-body); font-size: 1rem;
}
.migrate-banner p { margin: 0; flex: 1; min-width: 220px; }
.migrate-banner .migrate-actions { display: flex; gap: 10px; flex-shrink: 0; }

/* === Modal === */
.modal-overlay {
  display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.7);
  z-index: 2000; align-items: center; justify-content: center;
}
.modal-overlay.active { display: flex; }
.modal-box {
  background: var(--sea-mid); border: 1px solid rgba(245, 200, 74, 0.15);
  padding: 32px; min-width: 320px; max-width: 400px;
}
.modal-box h3 {
  font-family: var(--f-disp); font-size: 0.9rem; letter-spacing: 3px;
  color: var(--gold); margin-bottom: 16px; text-align: center;
}
.modal-box .form-group { margin-bottom: 16px; }
.modal-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 8px; }

/* === Responsive === */
@media (max-width: 1024px) {
  .app-layout { grid-template-columns: 1fr; }
  .container { padding: 24px 20px; }
  .topics-list { max-height: 160px; }
  .item-list { max-height: 200px; }
  .admin-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .tab-btn { padding: 10px 16px; font-size: 0.8rem; }
  .card-body { padding: 20px; }
  .form-row { grid-template-columns: 1fr; }
  .output-content { min-height: 200px; }
  .form-actions { flex-direction: column; }
  .form-actions .btn { justify-content: center; }
  .admin-grid { grid-template-columns: 1fr; }
}