:root {
    --bg: #1f222a;
    --bg-elev: #2a2f3a;
    --bg-muted: #252a34;
    --text: #e6e6e6;
    --text-muted: #b8c0cc;
    --primary: #5b9bff;
    --border: #3a3f4a;
}

/* Custom selection highlight */
::selection { background: rgba(91,155,255,.35); color: var(--text); }
::-moz-selection { background: rgba(91,155,255,.35); color: var(--text); }

body { background-color: var(--bg); color: var(--text); }
.navbar, .dropdown-menu { background-color: #171a21 !important; }
.navbar .nav-link, .navbar .navbar-brand, .navbar .navbar-text { color: var(--text-muted) !important; }
.navbar .nav-link.active, .navbar .nav-link:hover { color: var(--text) !important; }

.container { max-width: 1400px; }

.card, .category-card, .modal-content { background-color: var(--bg-elev); color: var(--text); border-color: var(--border); }
.modal-header, .modal-footer { border-color: var(--border); }

.sortable-ghost { opacity: 0.4; }
.sortable-chosen { box-shadow: 0 0 20px rgba(0,0,0,0.2); }

.cards-container { opacity: 0; transform: translateY(20px); animation: fadeInUp 0.5s forwards; }
@keyframes fadeInUp { to { opacity: 1; transform: translateY(0); } }

/* Sidebar layout */
.app-shell { display: grid; grid-template-columns: 280px 1fr; min-height: calc(100vh - 56px); }
.sidebar { background: var(--bg-muted); border-right: 1px solid var(--border); padding: 12px; overflow-y: auto; }
.sidebar .toolbar { display:flex; gap:8px; margin-bottom:10px; }
.tree { list-style: none; padding-left: 0; margin: 0; }
.tree .node { display:flex; align-items:center; gap:6px; padding:6px 8px; border-radius:6px; cursor: pointer; color: var(--text-muted); }
.tree .node:hover { background: var(--bg-elev); color: var(--text); }
.tree .node.active { background: #334155; color: var(--text); }
.tree .children { margin-left: 18px; list-style: none; padding-left: 0; }
.tree .toggle { width: 16px; text-align:center; color: var(--text-muted); }
.tree .title { flex:1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.content { padding: 20px; }
/* Title inline editor */
#nodeTitle { display: inline-block; max-width: 100%; white-space: normal; word-break: break-word; outline: none; }

/* Dark adjustments for flip cards */
.card-front, .card-back { background: var(--bg-elev) !important; color: var(--text); border: 1px solid var(--border); }
.card-back { background: var(--bg) !important; }
.category-badge { background: #0d6efd !important; }

/* Form controls dark */
.form-control, .form-select, .input-group-text { background-color: var(--bg); color: var(--text); border-color: var(--border); }
.form-control:focus, .form-select:focus { background-color: var(--bg); color: var(--text); border-color: var(--primary); box-shadow: 0 0 0 .2rem rgba(91,155,255,.15); }

/* Alerts */
.alert { background-color: var(--bg-elev); color: var(--text); border-color: var(--border); }
.alert-info { border-left: 4px solid var(--primary); }

/* Override Bootstrap light helpers to dark equivalents */
.bg-light { background-color: var(--bg) !important; color: var(--text) !important; }
.text-muted { color: var(--text-muted) !important; }

/* Buttons tweak for dark */
.btn-primary { background-color: var(--primary); border-color: var(--primary); }
.btn-outline-secondary { color: var(--text); border-color: var(--border); }
.btn-outline-light { color: var(--text); border-color: var(--border); }
.btn-success { background-color: #2ea043; border-color: #2ea043; }

/* Links */
a { color: #8ab4ff; }
a:hover { color: #a6c8ff; }

/* Cards and tables details */
.card-header { background: var(--bg); border-bottom: 1px solid var(--border); }
.table { color: var(--text); }
.table td, .table th { border-color: var(--border) !important; }
.table-striped > tbody > tr:nth-of-type(odd) { --bs-table-accent-bg: var(--bg-elev); color: var(--text); }
.table-striped > tbody > tr { background-color: var(--bg) !important; }

/* Page blocks */
.page-blocks { min-height: 60vh; padding: 16px; border: 1px dashed var(--border); border-radius: 8px; background: var(--bg-elev); }
.blocks { list-style: none; padding-left: 0; margin: 0; }
.block { padding: 6px 8px; border-radius: 6px; }
.block-row { display: flex; align-items: flex-start; gap: 8px; min-width: 0; }
.block:hover { background: var(--bg); }
.blk-handle { cursor: grab; color: var(--text-muted); user-select: none; padding: 2px 4px; opacity: 0; transition: opacity .15s ease; }
.block-row:hover .blk-handle { opacity: 1; }
.blk-input { flex: 1 1 auto; min-height: 28px; outline: none; min-width: 0; white-space: pre-wrap; word-break: break-word; overflow-wrap: anywhere; }
.blk-hint { margin-top: 8px; cursor: text; }
.blk-input:empty:before { content: attr(data-placeholder); color: var(--text-muted); }

/* Flashcard styles */
.block.card-q .blk-input { position: relative; flex: 0 1 auto; display: inline-block; max-width: calc(100% - 28px); }
.block.card-q .card-arrow { margin-left: 6px; font-size: .8rem; color: var(--text); border: 1px solid var(--border); border-radius: 6px; padding: 0 6px; line-height: 18px; height: 18px; display: inline-flex; align-items: center; background: var(--bg); box-shadow: 0 1px 2px rgba(0,0,0,.3); cursor: pointer; }
.block.card-q .card-arrow { transition: transform .15s ease, opacity .15s ease; }
.block.collapsed .card-arrow { opacity: .8; transform: rotate(-90deg); }
.block.collapsed > .children { display: none; }

/* Table block */
.block.table .tbl { width: 100%; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; background: var(--bg-elev); box-shadow: 0 6px 20px rgba(0,0,0,.25); }
.block.table .tbl-heading { padding: 10px 12px; font-weight: 700; outline: none; border-bottom: 1px solid var(--border); background: var(--bg-elev); text-align: center; font-size: 1.1rem; color: var(--text); }
.block.table .tbl-row { display: grid; grid-template-columns: 1fr 1fr; border-bottom: 1px solid var(--border); background: var(--bg-elev); color: var(--text); }
.block.table .tbl-row:last-child { border-bottom: none; }
.block.table .tbl-cell { padding: 10px 12px; min-height: 34px; outline: none; border-right: 1px solid var(--border); white-space: pre-wrap; word-break: break-word; background: transparent; color: var(--text); }
.block.table .tbl-row .tbl-cell:last-child { border-right: none; }
.block.table .tbl-cell:empty:before { content: attr(data-placeholder); color: var(--text-muted); }
.block.table .tbl-row:nth-child(odd) { background: #252a34; }
.block.table .tbl-row:nth-child(even) { background: #2a2f3a; }
.block.table .tbl-cell:focus { box-shadow: inset 0 0 0 2px rgba(91,155,255,.35); border-color: var(--primary); }

/* Todo block */
.block.todo .todo { display: inline-block; width: auto; max-width: 100%; border: 1px solid var(--border); border-radius: 10px; background: var(--bg-elev); overflow: visible; }
.block.todo .todo-heading { padding: 10px 12px; border-bottom: 1px solid var(--border); font-weight: 700; text-align: center; outline: none; color: var(--text); }
.block.todo .todo-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 6px 10px; border-bottom: 1px solid var(--border); }
.block.todo .todo-actions { display: flex; gap: 6px; flex-wrap: wrap; }
.block.todo .todo-filters { display: flex; gap: 6px; }
.block.todo .todo-btn, .block.todo .todo-filter { font: inherit; font-size: 12px; padding: 4px 8px; border: 1px solid var(--border); border-radius: 6px; background: var(--bg); color: var(--text); cursor: pointer; }
.block.todo .todo-btn[data-tip] { position: relative; }
.block.todo .todo-btn[data-tip]:hover::after { content: attr(data-tip); position: absolute; bottom: calc(100% + 8px); left: 0; background: var(--bg-elev); color: var(--text); border: 1px solid var(--border); border-radius: 6px; padding: 6px 8px; font-size: 12px; white-space: nowrap; box-shadow: 0 6px 18px rgba(0,0,0,.25); z-index: 10; pointer-events: none; }
.block.todo .todo-btn[data-tip]:hover::before { content: ''; position: absolute; bottom: 100%; left: 14px; border-width: 6px; border-style: solid; border-color: var(--bg-elev) transparent transparent transparent; transform: translateY(0); }
.block.todo .todo-filter.active { background: var(--bg-elev); font-weight: 600; }
.block.todo .todo-progress { display: flex; align-items: center; gap: 8px; min-width: 140px; }
.block.todo .todo-progress-text { color: var(--text-muted); font-size: 12px; }
.block.todo .todo-progress-bar { position: relative; width: 120px; height: 6px; background: var(--bg); border: 1px solid var(--border); border-radius: 4px; overflow: hidden; }
.block.todo .todo-progress-fill { position: absolute; left: 0; top: 0; bottom: 0; width: 0%; background: var(--primary); }
.block.todo .todo-item { display: flex; align-items: flex-start; gap: 8px; padding: 8px 12px; border-bottom: 1px solid var(--border); }
.block.todo .todo-item:last-child { border-bottom: none; }
.block.todo .todo-drag { cursor: grab; color: var(--text-muted); user-select: none; line-height: 1; }
.block.todo .todo-check { margin-top: 2px; }
.block.todo .todo-priority { border: none; background: transparent; color: white; cursor: pointer; line-height: 1; }
.block.todo .todo-priority.is-done { color: #39d98a; }
.block.todo .todo-priority:disabled { opacity: .7; cursor: default; }
.block.todo .todo-text { flex: 0 1 auto; outline: none; white-space: pre-wrap; word-break: break-word; color: var(--text); }
.block.todo .todo-text:empty:before { content: 'Beispiel'; color: var(--text-muted); }
.block.todo .todo-item.done .todo-text { text-decoration: line-through; color: var(--text-muted); }
.block.todo .todo-heading.all-done { text-decoration: line-through; color: var(--text-muted); }
.blocks .children { margin-left: 22px; list-style: none; padding-left: 0; }

/* Sidebar drag area hint */
.tree.sortable .node { user-select: none; }

/* Block menu */
.blk-menu { position: fixed; background: var(--bg-elev); border: 1px solid var(--border); border-radius: 8px; padding: 6px; z-index: 3000; min-width: 220px; box-shadow: 0 8px 24px rgba(0,0,0,.35); }
.blk-menu .item { display: flex; gap:8px; align-items: center; padding:6px 8px; border-radius:6px; color: var(--text); cursor: pointer; }
.blk-menu .item:hover { background: var(--bg); }
.slash-menu { position:absolute; background: var(--bg-elev); border:1px solid var(--border); border-radius:8px; padding:6px; z-index: 2500; min-width: 260px; box-shadow: 0 8px 24px rgba(0,0,0,.35); }
.slash-menu .item { padding:6px 8px; border-radius:6px; cursor:pointer; }
.slash-menu .item:hover { background: var(--bg); }

/* Variations */
.block.h1 .blk-input { font-size: 1.6rem; font-weight: 700; }
.block.bullet .blk-input { position: relative; }
.block.bullet .blk-input::before { content: '\2022'; color: var(--text-muted); margin-right: 8px; }
.block.todo .blk-input::before { content: '\2610'; color: var(--text-muted); margin-right: 8px; }

/* Cloze blocks */
.block.cloze .cloze-text { flex: 1 1 auto; white-space: pre-wrap; word-break: break-word; color: var(--text); }
.cloze-blank { display: inline-flex; align-items: center; justify-content: center; min-width: 1.25em; height: 1.25em; padding: 0 6px; margin: 0 2px; border: 1px solid var(--border); background: var(--bg); color: var(--text); border-radius: 6px; font-weight: 700; line-height: 1; }
.cloze-blank { cursor: pointer; }
.cloze-blank.revealed { background: rgba(91,155,255,.15); color: var(--text); border-color: var(--primary); }
.cloze-reveal-btn { margin-left: 8px; font-size: .8rem; color: var(--text); border: 1px solid var(--border); border-radius: 6px; padding: 0 8px; line-height: 24px; height: 26px; display: inline-flex; align-items: center; background: var(--bg); box-shadow: 0 1px 2px rgba(0,0,0,.3); cursor: pointer; }
.cloze-reveal-btn:hover { background: var(--bg-elev); }

/* Pomodoro block */
.block.pomodoro .pomo { background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 12px; box-shadow: 0 2px 10px rgba(0,0,0,.25); }
.block.pomodoro .pomo-header { display:flex; align-items:center; justify-content: space-between; gap: 8px; margin-bottom: 8px; }
.block.pomodoro .pomo-title { font-weight: 600; outline: none; }
.block.pomodoro .pomo-phase { display:none; }
.block.pomodoro .pomo-tabs { display:flex; gap: 8px; background: var(--bg-elev); border: 1px solid var(--border); padding: 4px; border-radius: 999px; }
.block.pomodoro .pomo-tab { background: transparent; color: var(--text-muted); border: 0; padding: 6px 10px; border-radius: 999px; cursor: pointer; font-weight: 600; }
.block.pomodoro .pomo-tab.active { background: var(--primary); color: #0b1220; }
.block.pomodoro .pomo-main { display:flex; flex-direction: column; align-items: stretch; gap: 8px; }
.block.pomodoro .pomo-time { font-size: 2.4rem; font-weight: 700; letter-spacing: 1px; text-align: center; }
.block.pomodoro .pomo-progress { height: 8px; background: var(--bg-elev); border: 1px solid var(--border); border-radius: 999px; overflow: hidden; }
.block.pomodoro .pomo-progress-fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--primary), #7cc0ff); transition: width .25s ease; }
.block.pomodoro .pomo-footer { display:flex; align-items:center; justify-content: space-between; gap: 12px; margin-top: 8px; flex-wrap: wrap; }
.block.pomodoro .pomo-toolbar { display:flex; gap: 8px; }
.block.pomodoro .pomo-actions { gap: 10px; }
.block.pomodoro .pomo-btn { background: var(--bg-elev); border: 1px solid var(--border); color: var(--text); font-weight: 600; padding: 8px 12px; border-radius: 8px; cursor: pointer; box-shadow: 0 2px 6px rgba(0,0,0,.15); }
.block.pomodoro .pomo-btn.pomo-primary { background: var(--primary); border-color: var(--primary); color: #0b1220; width: 44px; height: 44px; border-radius: 999px; display: inline-flex; align-items: center; justify-content: center; font-size: 18px; }
.block.pomodoro .pomo-btn.pomo-secondary { width: 44px; height: 44px; border-radius: 999px; display: inline-flex; align-items: center; justify-content: center; font-size: 18px; }
.block.pomodoro .pomo-btn:hover { filter: brightness(1.05); }
.block.pomodoro.is-running .pomo-btn[data-key="start"] { background: #374151; border-color: #374151; color: var(--text); }
.block.pomodoro .pomo-sound { display:flex; align-items:center; gap: 10px; }
.block.pomodoro .pomo-sound-label { color: var(--text-muted); font-size: .9rem; }
.block.pomodoro .pomo-sound input[type="range"] { width: 120px; }
/* Switch */
.block.pomodoro .pomo-switch { position: relative; display: inline-block; width: 40px; height: 22px; }
.block.pomodoro .pomo-switch input { opacity: 0; width: 0; height: 0; }
.block.pomodoro .pomo-switch .slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: #4b5563; transition: .2s; border-radius: 999px; }
.block.pomodoro .pomo-switch .slider:before { position: absolute; content: ""; height: 16px; width: 16px; left: 3px; bottom: 3px; background-color: white; transition: .2s; border-radius: 50%; }
.block.pomodoro .pomo-switch input:checked + .slider { background-color: var(--primary); }
.block.pomodoro .pomo-switch input:checked + .slider:before { transform: translateX(18px); }

/* Modern selects + visuals */
.block.pomodoro .pomo-select { background: var(--bg); color: var(--text); border: 1px solid var(--border); border-radius: 8px; padding: 6px 10px; outline: none; box-shadow: 0 1px 2px rgba(0,0,0,.25) inset; }
.block.pomodoro .pomo-select:focus { border-color: var(--primary); box-shadow: 0 0 0 .15rem rgba(91,155,255,.15); }
.block.pomodoro .pomo-visual-ctrl { display:flex; align-items:center; gap: 10px; }
.block.pomodoro .pomo-ring { display: grid; place-items: center; margin: 4px auto 0; }
.block.pomodoro .pomo-ring svg { grid-area: 1 / 1; transform: rotate(-90deg); }
.block.pomodoro .pomo-ring .pomo-ring-center { grid-area: 1 / 1; font-size: 2rem; font-weight: 700; letter-spacing: 1px; }
.block.pomodoro .pomo-ring-track { stroke: var(--bg-elev); }
.block.pomodoro .pomo-ring-arc { stroke: var(--primary); stroke-linecap: round; transition: stroke-dashoffset .25s ease; }

/* Gear button */
.block.pomodoro .pomo-gear { background: transparent; border: 1px solid var(--border); color: var(--text-muted); width: 32px; height: 32px; border-radius: 999px; display:inline-flex; align-items:center; justify-content:center; cursor:pointer; }
.block.pomodoro .pomo-gear:hover { color: var(--text); background: var(--bg-elev); }

/* Themes */
.block.pomodoro .pomo.pomo-theme-solid { background: var(--bg); }
.block.pomodoro .pomo.pomo-theme-gradient-global { background: linear-gradient(135deg, #1f2937 0%, #0f172a 100%); }
.block.pomodoro .pomo.pomo-theme-gradient-phase-focus { background: linear-gradient(135deg, #1e3a8a 0%, #0ea5e9 100%); }
.block.pomodoro .pomo.pomo-theme-gradient-phase-break { background: linear-gradient(135deg, #065f46 0%, #10b981 100%); }
.block.pomodoro .pomo.pomo-theme-gradient-phase-long { background: linear-gradient(135deg, #7c2d12 0%, #f59e0b 100%); }