:root {
  --bg: var(--tg-theme-bg-color, #1a1a2e);
  --text: var(--tg-theme-text-color, #e0e0e0);
  --hint: var(--tg-theme-hint-color, #8888aa);
  --link: var(--tg-theme-link-color, #7c4dff);
  --btn-bg: var(--tg-theme-button-color, #7c4dff);
  --btn-text: var(--tg-theme-button-text-color, #ffffff);
  --secondary-bg: var(--tg-theme-secondary-bg-color, #16213e);
  --card-bg: #1e2a4a;
  --border: #2a3a5c;
  --danger: #ff4757;
  --success: #2ed573;
  --warning: #ffa502;
  --radius: 12px;
  --shadow: 0 2px 12px rgba(0,0,0,0.3);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-tap-highlight-color: transparent;
}

/* Header */
.header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px;
  background: var(--secondary-bg);
  border-bottom: 1px solid var(--border);
}
.header h1 { font-size: 20px; font-weight: 700; }
.header-actions { display: flex; gap: 8px; }
.btn-icon {
  background: none; border: none; font-size: 22px; cursor: pointer;
  padding: 4px 8px; border-radius: 8px;
  transition: background 0.2s;
}
.btn-icon:hover { background: var(--border); }

/* Tabs */
.tabs {
  display: flex; gap: 4px; padding: 12px 16px;
  background: var(--secondary-bg);
  overflow-x: auto;
}
.tab {
  flex: 1; padding: 10px 16px;
  background: transparent; border: 1px solid var(--border);
  color: var(--hint); border-radius: 10px;
  font-size: 13px; font-weight: 600; cursor: pointer;
  transition: all 0.2s; white-space: nowrap;
}
.tab.active {
  background: var(--btn-bg); color: var(--btn-text);
  border-color: var(--btn-bg);
}

/* Quick Add */
.quick-add {
  display: flex; gap: 8px; padding: 12px 16px;
  background: var(--secondary-bg);
  border-bottom: 1px solid var(--border);
}
.quick-add input {
  flex: 1; padding: 12px 16px;
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--text);
  font-size: 15px; outline: none;
}
.quick-add input:focus { border-color: var(--btn-bg); }
.btn-add {
  width: 48px; height: 48px;
  background: var(--btn-bg); border: none; border-radius: var(--radius);
  font-size: 20px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: transform 0.1s;
}
.btn-add:active { transform: scale(0.95); }

/* Task List */
.task-list { padding: 8px 16px 80px; }

.task-card {
  background: var(--card-bg); border-radius: var(--radius);
  padding: 14px 16px; margin-bottom: 8px;
  border-left: 4px solid var(--border);
  display: flex; align-items: flex-start; gap: 12px;
  cursor: pointer; transition: all 0.2s;
  box-shadow: var(--shadow);
}
.task-card:active { transform: scale(0.99); }
.task-card.priority-1 { border-left-color: #ff4757; }
.task-card.priority-2 { border-left-color: #ffa502; }
.task-card.priority-3 { border-left-color: #ffd43b; }
.task-card.priority-4 { border-left-color: #2ed573; }
.task-card.done { opacity: 0.5; }
.task-card.done .task-title { text-decoration: line-through; }

.task-check {
  width: 24px; height: 24px; min-width: 24px;
  border: 2px solid var(--hint); border-radius: 50%;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: all 0.2s; margin-top: 2px;
}
.task-check.checked {
  background: var(--success); border-color: var(--success); color: #fff;
}

.task-info { flex: 1; min-width: 0; }
.task-title { font-size: 15px; font-weight: 500; word-break: break-word; }
.task-meta {
  display: flex; gap: 8px; margin-top: 4px;
  font-size: 12px; color: var(--hint); flex-wrap: wrap;
}
.task-meta span { display: flex; align-items: center; gap: 2px; }

/* Day Group */
.day-group { margin-bottom: 16px; }
.day-group-header {
  font-size: 14px; font-weight: 700; color: var(--hint);
  padding: 8px 0; text-transform: uppercase;
  border-bottom: 1px solid var(--border); margin-bottom: 8px;
}
.day-group-header.today { color: var(--btn-bg); }

/* Stats Bar */
.stats-bar {
  position: fixed; bottom: 0; left: 0; right: 0;
  display: flex; justify-content: space-around;
  padding: 12px; background: var(--secondary-bg);
  border-top: 1px solid var(--border);
  font-size: 14px; font-weight: 600;
}

/* Modal */
.modal-overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,0.6); z-index: 1000;
  align-items: flex-end; justify-content: center;
}
.modal-overlay.show { display: flex; }
.modal {
  background: var(--secondary-bg);
  border-radius: 20px 20px 0 0; width: 100%;
  max-width: 500px; max-height: 90vh; overflow-y: auto;
  animation: slideUp 0.3s ease;
}
@keyframes slideUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

.modal-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 20px; border-bottom: 1px solid var(--border);
}
.modal-header h2 { font-size: 18px; }
.modal-close {
  background: none; border: none; font-size: 28px;
  color: var(--hint); cursor: pointer; padding: 0 8px;
}
.modal-body { padding: 20px; }
.modal-footer {
  padding: 16px 20px; border-top: 1px solid var(--border);
  display: flex; gap: 8px; justify-content: flex-end;
}

/* Form */
.input {
  width: 100%; padding: 12px 16px;
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: 10px; color: var(--text);
  font-size: 15px; outline: none; margin-bottom: 12px;
}
.input:focus { border-color: var(--btn-bg); }
.textarea { min-height: 80px; resize: vertical; font-family: inherit; }
.form-row { display: flex; gap: 12px; }
.form-group { flex: 1; }
.form-group label {
  display: block; font-size: 13px; color: var(--hint);
  margin-bottom: 6px; font-weight: 600;
}
select.input { appearance: none; cursor: pointer; }

/* Buttons */
.btn {
  padding: 12px 24px; border: none; border-radius: 10px;
  font-size: 15px; font-weight: 600; cursor: pointer;
  transition: all 0.2s;
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--btn-bg); color: var(--btn-text); }
.btn-danger { background: var(--danger); color: #fff; }

/* Habits */
.habit-card {
  display: flex; align-items: center; gap: 12px;
  padding: 14px; background: var(--card-bg);
  border-radius: var(--radius); margin-bottom: 8px;
}
.habit-emoji { font-size: 24px; }
.habit-info { flex: 1; }
.habit-title { font-size: 15px; font-weight: 500; }
.habit-streak { font-size: 12px; color: var(--hint); }
.habit-check {
  width: 40px; height: 40px;
  background: var(--border); border: none; border-radius: 50%;
  font-size: 18px; cursor: pointer; transition: all 0.2s;
}
.habit-check.done { background: var(--success); }

/* Empty State */
.empty-state {
  text-align: center; padding: 60px 20px;
  color: var(--hint);
}
.empty-state .emoji { font-size: 48px; margin-bottom: 12px; }
.empty-state p { font-size: 15px; }

/* Overdue */
.overdue-badge {
  background: var(--danger); color: #fff;
  padding: 2px 8px; border-radius: 6px;
  font-size: 11px; font-weight: 600;
}

@media (min-width: 600px) {
  .modal { border-radius: 20px; margin: auto; }
  .task-list { max-width: 600px; margin: 0 auto; }
}

/* ============ Conference Styles ============ */
.conf-panel { display: flex; flex-direction: column; flex: 1; overflow: hidden; }

.conf-lobby-header { display:flex; align-items:center; justify-content:space-between; padding:12px 16px; border-bottom:1px solid var(--border); }
.conf-lobby-header h2 { font-size:16px; }
.conf-rooms-list { flex:1; overflow-y:auto; padding:12px; display:flex; flex-direction:column; gap:10px; }
.conf-room-card { background:var(--card-bg); border-radius:var(--radius); padding:12px 14px; display:flex; align-items:center; justify-content:space-between; gap:10px; }
.conf-room-name { font-weight:600; font-size:14px; margin-bottom:2px; }
.conf-room-meta { font-size:11px; color:var(--hint); }
.conf-join-row { display:flex; gap:8px; padding:12px; border-top:1px solid var(--border); }
.conf-join-row .input { flex:1; }

.conf-create-modal { position:fixed; inset:0; background:rgba(0,0,0,0.6); display:flex; align-items:center; justify-content:center; z-index:1000; }

.conf-room-header { display:flex; align-items:center; gap:10px; padding:10px 14px; background:var(--secondary-bg); border-bottom:1px solid var(--border); }
.conf-room-header span { flex:1; font-weight:600; font-size:14px; text-align:center; }
.btn-icon-back { background:none; border:none; color:var(--text); font-size:18px; cursor:pointer; padding:4px 8px; }

.video-grid { flex:1; display:grid; grid-template-columns:repeat(auto-fill,minmax(140px,1fr)); gap:6px; padding:8px; overflow-y:auto; background:#0a0a14; }
.video-container { position:relative; background:#111; border-radius:10px; overflow:hidden; aspect-ratio:4/3; }
.video-container video { width:100%; height:100%; object-fit:cover; }
.video-label { position:absolute; bottom:0; left:0; right:0; background:linear-gradient(transparent,rgba(0,0,0,0.7)); padding:6px 8px; display:flex; align-items:center; justify-content:space-between; }
.video-label span { font-size:11px; color:#fff; }
.video-muted-icon { font-size:12px; }

.conf-controls { display:flex; justify-content:center; gap:12px; padding:10px; background:var(--secondary-bg); border-top:1px solid var(--border); }
.ctrl-btn { width:44px; height:44px; border-radius:50%; border:2px solid var(--border); background:var(--card-bg); color:var(--text); font-size:18px; cursor:pointer; display:flex; align-items:center; justify-content:center; transition:all 0.2s; }
.ctrl-btn:hover { background:var(--btn-bg); border-color:var(--btn-bg); }
.ctrl-btn.muted { background:#333; opacity:0.6; }
.ctrl-btn.danger { border-color:var(--danger); }
.ctrl-btn.danger:hover { background:var(--danger); }
.ctrl-btn.active { background:var(--btn-bg); border-color:var(--btn-bg); }

.conf-sidebar { position:absolute; top:0; right:0; bottom:0; width:240px; background:var(--secondary-bg); border-left:1px solid var(--border); display:flex; flex-direction:column; z-index:10; }
.sidebar-header { display:flex; align-items:center; justify-content:space-between; padding:10px 14px; border-bottom:1px solid var(--border); font-weight:600; }
.sidebar-header button { background:none; border:none; color:var(--hint); font-size:18px; cursor:pointer; }
.participant-item { padding:8px 14px; font-size:13px; border-bottom:1px solid var(--border); }

.conf-chat-messages { flex:1; overflow-y:auto; padding:10px; display:flex; flex-direction:column; gap:6px; }
.chat-msg { font-size:12px; line-height:1.5; }
.chat-system { color:var(--hint); font-style:italic; }
.conf-chat-input { display:flex; gap:6px; padding:8px; border-top:1px solid var(--border); }
.conf-chat-input .input { flex:1; font-size:13px; padding:6px 10px; }
.btn-sm { padding:6px 12px; font-size:12px; }