/* ============================================================
   StudyCanvas – notes-styles.css
   Light theme default · Material 3 · Accessible
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-font-smoothing: antialiased; }
html, body { height: 100%; }

/* ── LIGHT THEME (default) ── */
body.light-theme {
  --bg:          #ffffff;
  --bg2:         #f8fafc;
  --bg3:         #f1f5f9;
  --text1:       #0f172a;
  --text2:       #475569;
  --text3:       #94a3b8;
  --border:      #e2e8f0;
  --card-bg:     #ffffff;
  --card-border: #e2e8f0;
  --search-bg:   #f1f5f9;
  --nav-bg:      #ffffff;
  --nav-border:  #e2e8f0;
  --accent:      #0ea5e9;
  --accent-dark: #0284c7;
  --accent-bg:   #e0f2fe;
  --success:     #22c55e;
  --danger:      #ef4444;
  --chip-bg:     #f1f5f9;
  --chip-active-bg: #0ea5e9;
  --chip-active-text: #ffffff;
  --save-bar:    #f0fdf4;
  --save-border: #bbf7d0;
}

/* ── DARK THEME ── */
body.dark-theme {
  --bg:          #0f172a;
  --bg2:         #1e293b;
  --bg3:         #334155;
  --text1:       #f1f5f9;
  --text2:       #94a3b8;
  --text3:       #64748b;
  --border:      #334155;
  --card-bg:     #1e293b;
  --card-border: #334155;
  --search-bg:   #1e293b;
  --nav-bg:      #0f172a;
  --nav-border:  #334155;
  --accent:      #38bdf8;
  --accent-dark: #0ea5e9;
  --accent-bg:   #0c4a6e;
  --success:     #4ade80;
  --danger:      #f87171;
  --chip-bg:     #334155;
  --chip-active-bg: #38bdf8;
  --chip-active-text: #0f172a;
  --save-bar:    #052e16;
  --save-border: #166534;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: var(--app-text-size, 15px);
  background: var(--bg);
  color: var(--text1);
  transition: background .25s, color .25s;
}

/* ── PAGES ── */
.page { display: none; flex-direction: column; height: 100dvh; overflow: hidden; }
.page.active { display: flex; }

/* ── TOP BAR ── */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px 10px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  transition: background .25s, border-color .25s;
}
.topbar--settings { justify-content: flex-start; gap: 12px; }

.topbar__title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text1);
  letter-spacing: -.3px;
}
.topbar__actions { display: flex; gap: 6px; align-items: center; }

.icon-btn {
  width: 40px; height: 40px;
  background: none; border: none; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--text2);
  transition: background .15s, color .15s;
}
.icon-btn svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.icon-btn:hover { background: var(--bg3); color: var(--text1); }
.back-btn { margin-left: -8px; }

/* ── STORAGE STATUS BAR ── */
.storage-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--save-bar);
  border-bottom: 1px solid var(--save-border);
  font-size: 12px;
  font-weight: 600;
  color: #166534;
  flex-shrink: 0;
  transition: background .25s;
}
body.dark-theme .storage-bar { color: #4ade80; }
.storage-bar svg { width: 14px; height: 14px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }
.storage-dot { width: 8px; height: 8px; border-radius: 50%; margin-left: auto; flex-shrink: 0; }
.storage-dot.saved  { background: #22c55e; }
.storage-dot.saving { background: #f59e0b; animation: pulse 1s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .4; } }

/* ── SEARCH ── */
.search-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 12px 16px 8px;
  background: var(--search-bg);
  border-radius: 14px;
  padding: 10px 14px;
  flex-shrink: 0;
  border: 1.5px solid transparent;
  transition: border-color .2s, background .25s;
}
.search-wrap:focus-within { border-color: var(--accent); }
.search-icon { width: 17px; height: 17px; fill: none; stroke: var(--text3); stroke-width: 2; stroke-linecap: round; flex-shrink: 0; }
.search-input { flex: 1; background: none; border: none; outline: none; font-size: 15px; color: var(--text1); }
.search-input::placeholder { color: var(--text3); }
.search-clear { background: none; border: none; color: var(--text3); font-size: 18px; cursor: pointer; padding: 0 2px; }

/* ── FILTER CHIPS ── */
.filter-chips {
  display: flex;
  gap: 8px;
  padding: 4px 16px 8px;
  overflow-x: auto;
  flex-shrink: 0;
}
.filter-chips::-webkit-scrollbar { display: none; }
.chip {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: 50px;
  border: 1.5px solid var(--border);
  background: var(--chip-bg);
  color: var(--text2);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all .15s;
  flex-shrink: 0;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip.active { background: var(--chip-active-bg); color: var(--chip-active-text); border-color: transparent; }

/* ── NOTES MAIN ── */
.notes-main { flex: 1; overflow-y: auto; padding: 10px 16px 120px; }
.notes-main::-webkit-scrollbar { width: 4px; }
.notes-main::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.notes-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
@media (min-width: 600px) { .notes-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 900px) { .notes-grid { grid-template-columns: repeat(4, 1fr); } }

/* ── NOTE CARD ── */
.note-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  overflow: hidden;
  cursor: pointer;
  transition: transform .18s, box-shadow .18s;
  box-shadow: 0 1px 4px rgba(0,0,0,.05);
}
.note-card:hover { transform: translateY(-3px); box-shadow: 0 6px 20px rgba(0,0,0,.1); }

.note-card__thumb {
  width: 100%;
  height: 80px;
  overflow: hidden;
  position: relative;
  background: var(--bg3);
}
.note-card__thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.note-card__thumb-empty { width: 100%; height: 100%; }

.note-card__actions {
  position: absolute; top: 6px; right: 6px;
  display: flex; gap: 4px;
  opacity: 0; transition: opacity .15s;
}
.note-card:hover .note-card__actions,
.note-card:focus-within .note-card__actions { opacity: 1; }

.nca-btn {
  width: 30px; height: 30px;
  border: none; border-radius: 8px;
  font-size: 13px; cursor: pointer;
  background: rgba(255,255,255,.95);
  box-shadow: 0 2px 8px rgba(0,0,0,.15);
  transition: transform .12s;
  display: flex; align-items: center; justify-content: center;
}
body.dark-theme .nca-btn { background: rgba(30,41,59,.95); }
.nca-btn:hover { transform: scale(1.1); }

.note-card__body { padding: 10px 12px 13px; }
.note-card__sub {
  display: inline-block;
  font-size: 10px; font-weight: 700; letter-spacing: .06em;
  padding: 2px 8px; border-radius: 50px; margin-bottom: 5px;
  text-transform: uppercase;
}
.note-card__title {
  font-size: 14px; font-weight: 600; color: var(--text1);
  margin-bottom: 3px; white-space: nowrap;
  overflow: hidden; text-overflow: ellipsis;
}
.note-card__meta { font-size: 11px; color: var(--text3); }

/* ── EMPTY STATE ── */
.empty-state {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 60px 20px; gap: 12px; text-align: center;
}
.empty-state svg { width: 72px; height: 72px; opacity: .5; }
.empty-title { font-size: 17px; font-weight: 600; color: var(--text2); }
.empty-sub { font-size: 14px; color: var(--text3); }

/* Load more */
.load-more-btn {
  display: block; width: 100%; margin-top: 16px;
  padding: 14px; border: 1.5px dashed var(--border);
  background: none; border-radius: 14px;
  font-size: 14px; font-weight: 600; color: var(--text2);
  cursor: pointer; transition: border-color .15s, color .15s;
}
.load-more-btn:hover { border-color: var(--accent); color: var(--accent); }

/* ── FAB ── */
.fab {
  position: fixed;
  bottom: 90px; right: 20px;
  width: 56px; height: 56px;
  border-radius: 50%; border: none;
  background: var(--accent);
  color: #fff; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 16px rgba(14,165,233,.4);
  transition: transform .2s, box-shadow .2s;
  z-index: 50;
}
.fab svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 2.5; stroke-linecap: round; }
.fab:hover { transform: scale(1.08); box-shadow: 0 8px 24px rgba(14,165,233,.5); }
.fab:active { transform: scale(.94); }

/* ── BOTTOM NAV ── */
.bottom-nav {
  position: fixed; bottom: 0; left: 0; right: 0;
  display: flex; height: 68px;
  background: var(--nav-bg);
  border-top: 1px solid var(--nav-border);
  z-index: 40;
  transition: background .25s, border-color .25s;
}
.nav-item {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 4px;
  background: none; border: none; cursor: pointer;
  color: var(--text3); font-size: 11px; font-weight: 600;
  transition: color .2s;
}
.nav-item svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.nav-item.active { color: var(--accent); }

/* ── SETTINGS ── */
.settings-main {
  flex: 1; overflow-y: auto;
  padding: 16px 16px 100px;
}
.settings-label {
  font-size: 11px; font-weight: 700; letter-spacing: .08em;
  color: var(--text3); text-transform: uppercase;
  margin: 20px 4px 8px;
}
.settings-label:first-child { margin-top: 4px; }

.settings-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 16px;
  transition: background .25s, border-color .25s;
}
.settings-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.settings-card__title { font-size: 15px; font-weight: 600; color: var(--text1); }
.settings-card__sub { font-size: 13px; color: var(--text2); margin-top: 2px; }

.radio-group { display: flex; flex-direction: column; gap: 14px; margin-top: 14px; }
.radio-item { display: flex; align-items: center; gap: 12px; font-size: 15px; color: var(--text1); cursor: pointer; }
.radio-item input[type="radio"] { display: none; }
.radio-custom {
  width: 20px; height: 20px; border-radius: 50%;
  border: 2px solid var(--border); flex-shrink: 0;
  transition: border-color .2s;
}
.radio-item input:checked + .radio-custom {
  border-color: var(--accent);
  background: var(--accent);
  box-shadow: inset 0 0 0 3px var(--card-bg);
}

/* Sliders */
.slider-row { display: flex; align-items: center; gap: 10px; margin-top: 14px; }
.slider-icon { width: 18px; height: 18px; fill: none; stroke: var(--text3); stroke-width: 2; stroke-linecap: round; flex-shrink: 0; }
.settings-slider {
  -webkit-appearance: none; flex: 1; height: 4px;
  border-radius: 4px; outline: none; cursor: pointer;
  background: linear-gradient(to right, var(--accent) 0%, var(--accent) 30%, var(--border) 30%);
}
.settings-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 2px 6px rgba(14,165,233,.35); cursor: pointer;
}
.settings-slider::-moz-range-thumb {
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--accent); border: none;
  box-shadow: 0 2px 6px rgba(14,165,233,.35); cursor: pointer;
}

.text-size-row {
  display: flex; align-items: center; gap: 10px; margin-top: 12px;
}
.text-size-label { color: var(--text2); font-weight: 600; flex-shrink: 0; }
.text-size-val { font-size: 12px; color: var(--text3); min-width: 30px; text-align: right; flex-shrink: 0; }

.reset-btn {
  background: var(--bg3); border: 1px solid var(--border);
  color: var(--text2); font-size: 12px; font-weight: 700;
  padding: 6px 14px; border-radius: 8px; cursor: pointer;
  transition: background .15s; flex-shrink: 0;
}
.reset-btn:hover { background: var(--border); }

/* Action buttons */
.action-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 18px; border-radius: 12px; border: none;
  font-size: 14px; font-weight: 600; cursor: pointer;
  transition: opacity .15s;
}
.action-btn svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.action-btn--primary { background: var(--accent); color: #fff; }
.action-btn--secondary { background: var(--bg3); color: var(--text1); border: 1px solid var(--border); }
.action-btn:hover { opacity: .85; }

.danger-card { border-color: #fca5a5; }
body.dark-theme .danger-card { border-color: #7f1d1d; }
.danger-btn {
  background: var(--danger); color: #fff;
  border: none; border-radius: 50px;
  padding: 8px 18px; font-size: 14px; font-weight: 700;
  cursor: pointer; flex-shrink: 0; transition: opacity .15s;
}
.danger-btn:hover { opacity: .85; }

/* Info card */
.info-card { background: var(--accent-bg); border-color: transparent; }

.about-row { display: flex; align-items: center; gap: 12px; }
.about-icon { width: 22px; height: 22px; fill: none; stroke: var(--accent); stroke-width: 2; stroke-linecap: round; flex-shrink: 0; }

/* ── MODALS ── */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.45);
  display: flex; align-items: center; justify-content: center;
  z-index: 200; opacity: 0; pointer-events: none;
  transition: opacity .2s;
}
.modal-overlay.show { opacity: 1; pointer-events: all; }

.modal-box {
  background: var(--bg);
  border-radius: 20px;
  padding: 28px 24px 22px;
  width: 90%; max-width: 360px;
  text-align: center;
  transform: scale(.9);
  transition: transform .2s;
  max-height: 90dvh; overflow-y: auto;
}
.modal-overlay.show .modal-box { transform: scale(1); }

.modal-box__title { font-size: 18px; font-weight: 700; color: var(--text1); margin-bottom: 8px; }
.modal-box__sub { font-size: 14px; color: var(--text2); margin-bottom: 20px; line-height: 1.5; }
.modal-box__label { font-size: 11px; font-weight: 700; color: var(--text3); text-transform: uppercase; letter-spacing: .06em; margin-bottom: 10px; text-align: left; }
.modal-box__actions { display: flex; gap: 10px; margin-top: 16px; }
.modal-btn-cancel {
  flex: 1; padding: 13px; border-radius: 12px;
  border: 1.5px solid var(--border); background: none;
  color: var(--text1); font-size: 15px; font-weight: 600; cursor: pointer;
  transition: background .15s;
}
.modal-btn-cancel:hover { background: var(--bg3); }
.modal-btn-confirm {
  flex: 1; padding: 13px; border-radius: 12px;
  border: none; background: var(--accent);
  color: #fff; font-size: 15px; font-weight: 700; cursor: pointer;
  transition: opacity .15s;
}
.modal-btn-confirm:hover { opacity: .85; }
.modal-btn-danger { background: var(--danger) !important; }

/* New note modal */
.new-note-box { text-align: left; max-width: 400px; }
.modal-input {
  width: 100%; border: 1.5px solid var(--border);
  border-radius: 12px; padding: 12px 14px;
  font-size: 16px; background: var(--bg);
  color: var(--text1); outline: none;
  margin: 10px 0 16px;
  transition: border-color .2s;
}
.modal-input:focus { border-color: var(--accent); }

.subject-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 8px; }
.subject-chip {
  border: 1.5px solid var(--cc, #64748b);
  color: var(--cc, #64748b);
  background: transparent; border-radius: 10px;
  padding: 8px 4px; font-size: 11.5px; font-weight: 700;
  cursor: pointer; transition: all .15s;
}
.subject-chip.active { background: var(--cc, #64748b); color: #fff; }

/* Backup modal */
.backup-box { text-align: left; max-width: 340px; }
.backup-options { display: flex; flex-direction: column; gap: 10px; margin-top: 16px; }
.backup-opt-btn {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 16px; border-radius: 14px;
  border: 1.5px solid var(--border); background: var(--bg2);
  cursor: pointer; text-align: left; transition: border-color .15s, background .15s;
  width: 100%;
}
.backup-opt-btn:hover { border-color: var(--accent); background: var(--accent-bg); }
.backup-opt-btn svg { width: 22px; height: 22px; fill: none; stroke: var(--accent); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }
.backup-opt-label { font-size: 15px; font-weight: 700; color: var(--text1); display: block; }
.backup-opt-sub { font-size: 12px; color: var(--text3); display: block; margin-top: 2px; }

/* ── TOAST ── */
.sc-toast {
  position: fixed; bottom: 80px; left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: var(--text1); color: var(--bg);
  font-size: 13px; font-weight: 600;
  padding: 10px 20px; border-radius: 50px;
  opacity: 0; pointer-events: none; z-index: 500;
  transition: opacity .25s, transform .25s;
  white-space: nowrap;
  box-shadow: 0 4px 16px rgba(0,0,0,.2);
}
.sc-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }