:root {
    --bg: #f4f4f4; --panel-bg: #ffffff; --border: #e0e0e0; --text: #333; --accent: #4CAF50; --task-bg: #fafafa; --danger: #f44336;
}
.theme-dark { 
    --bg: #121212; --panel-bg: #1e1e1e; --border: #333; --text: #e0e0e0; --accent: #81c784; --task-bg: #2d2d2d; --danger: #ef5350;
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Segoe UI', sans-serif; }
body { background-color: var(--bg); color: var(--text); height: 100dvh; display: flex; flex-direction: column; transition: background 0.3s; overflow: hidden; }

.header { background: var(--panel-bg); padding: 10px 20px; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; }
.header-top { display: flex; align-items: center; gap: 20px; }
.header h1 { font-size: 16px; text-transform: uppercase; }
.user-info { display: flex; gap: 10px; align-items: center; font-size: 13px; }
.user-info a { text-decoration: none; color: var(--text); border: 1px solid var(--border); padding: 4px 8px; border-radius: 4px; }
.user-info a:hover { background: var(--border); }

.header-controls { display: flex; gap: 8px; align-items: center; margin-left: auto; }

.calendar-btn-wrapper { background: var(--panel-bg); border: 1px solid var(--border); padding: 8px 12px; border-radius: 6px; cursor: pointer; font-size: 13px; display: flex; align-items: center; gap: 5px; color: var(--text); }
.btn-today, .btn-analytics, .btn-theme { background: var(--accent); color: #fff; border: none; padding: 8px 12px; border-radius: 6px; cursor: pointer; font-size: 13px; font-weight: bold; }
.btn-theme { background: var(--panel-bg); color: var(--text); border: 1px solid var(--border); font-size: 16px; padding: 5px 10px; }

.main-container { display: flex; flex: 1; overflow: hidden; }
.sidebar { width: 260px; background: var(--panel-bg); border-right: 1px solid var(--border); padding: 15px; display: flex; flex-direction: column; gap: 15px; overflow-y: auto; z-index: 10; }
.sidebar-box { border: 1px solid var(--border); padding: 15px; background: var(--bg); border-radius: 8px; }
.sidebar-box h3 { font-size: 14px; text-align: center; border-bottom: 1px solid var(--border); padding-bottom: 8px; margin-bottom: 12px; }
.overdue-box h3 { color: var(--danger); }

.task-list { flex: 1; padding: 2px; overflow-y: auto; min-height: 50px; }
.planner-area { flex: 1; display: flex; overflow-x: auto; scroll-snap-type: x mandatory; background: var(--bg); cursor: grab; user-select: none; will-change: scroll-position; }
.planner-area:active { cursor: grabbing; }
.planner-area::-webkit-scrollbar { height: 8px; }
.planner-area::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.day-column { min-width: 280px; width: 280px; background: var(--panel-bg); border-right: 1px solid var(--border); display: flex; flex-direction: column; scroll-snap-align: start; flex-shrink: 0; content-visibility: auto; contain-intrinsic-size: 280px 500px; }
.day-header { text-align: center; border-bottom: 1px solid var(--border); padding: 10px 5px; background: var(--bg); position: sticky; top: 0; z-index: 10; }
.day-header.is-today { background: var(--accent); color: #fff; }
.day-header.is-today .full-date { color: #eee; }
.day-header .short-name { font-weight: bold; font-size: 14px; text-transform: uppercase; }
.day-header .full-date { font-size: 12px; margin-top: 4px; opacity: 0.8; }

.task-item { border: 1px solid var(--border); background: var(--task-bg); margin-bottom: 6px; padding: 8px; display: flex; align-items: flex-start; gap: 6px; font-size: 13px; border-radius: 4px; position: relative; }
.task-item.completed { opacity: 0.5; text-decoration: line-through; }
.task-item input[type="checkbox"] { margin-top: 2px; cursor: pointer; flex-shrink: 0; }
.task-title { flex: 1; min-width: 0; word-break: break-word; overflow-wrap: break-word; white-space: pre-wrap; color: var(--text); padding-right: 25px; cursor: text; }
.task-edit-input { width: 100%; padding: 4px; border: 1px solid var(--accent); background: var(--bg); color: var(--text); font-size: 13px; border-radius: 3px; outline: none; resize: none; overflow: hidden; min-height: 30px; font-family: inherit; line-height: 1.4; }
.task-time { font-size: 11px; color: var(--accent); font-weight: bold; min-width: 35px; flex-shrink: 0; }
.reschedule-badge { background: #ff9800; color: #fff; padding: 1px 4px; border-radius: 4px; font-size: 10px; flex-shrink: 0; }
.task-actions { position: absolute; right: 5px; top: 8px; opacity: 0.4; }
.task-actions:hover { opacity: 1; }
.task-actions span { font-size: 12px; cursor: pointer; }

.add-form { padding: 10px; background: var(--bg); border-top: 1px solid var(--border); }
.add-form input[type="text"] { width: 100%; padding: 8px; border: 1px solid var(--border); margin-bottom: 5px; font-size: 13px; background: var(--task-bg); color: var(--text); border-radius: 4px; }
.add-row { display: flex; gap: 5px; }
.add-row select { padding: 4px; border: 1px solid var(--border); font-size: 12px; background: var(--task-bg); color: var(--text); border-radius: 4px; outline: none; }
.time-group { display: flex; gap: 2px; align-items: center; }
.time-group select { width: 45px; padding: 4px 2px; text-align: center; }
.add-row .rec-select { flex: 1; min-width: 0; }
.add-row button { background: var(--accent); color: white; border: none; cursor: pointer; padding: 5px 15px; border-radius: 4px; font-weight: bold; flex-shrink: 0; }

.modal { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); z-index: 100; align-items: center; justify-content: center; }
.modal.active { display: flex; }
.modal-content { background: var(--panel-bg); padding: 20px; border-radius: 12px; width: 90%; max-width: 400px; border: 1px solid var(--border); }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 15px; }
.btn-close { background: none; border: none; font-size: 20px; color: var(--text); cursor: pointer; }

.analytics-tabs { display: flex; gap: 5px; margin-bottom: 20px; }
.analytics-tabs button { flex: 1; padding: 6px; border: 1px solid var(--border); background: var(--bg); color: var(--text); border-radius: 6px; cursor: pointer; font-size: 12px; }
.analytics-tabs button.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.analytics-content { display: flex; flex-direction: column; align-items: center; gap: 20px; }
.stat-circle { width: 140px; height: 140px; }
.circular-chart { display: block; margin: 0 auto; max-width: 100%; max-height: 250px; }
.circle-bg { fill: none; stroke: var(--border); stroke-width: 3.8; }
.circle { fill: none; stroke: var(--accent); stroke-width: 2.8; stroke-linecap: round; transition: stroke-dasharray 0.5s ease; }
.percentage { fill: var(--text); font-size: 8px; text-anchor: middle; font-weight: bold; }
.stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; width: 100%; text-align: center; }
.stat-card { background: var(--bg); padding: 10px; border-radius: 8px; font-size: 12px; color: var(--text); border: 1px solid var(--border); }
.stat-card span { font-size: 18px; font-weight: bold; color: var(--accent); }

/* Календарь */
.calendar-content { max-width: 340px; }
.cal-nav { display: flex; justify-content: space-between; align-items: center; margin-bottom: 15px; background: var(--bg); padding: 5px; border-radius: 8px; }
.cal-nav button { background: none; border: none; font-size: 16px; cursor: pointer; color: var(--text); padding: 5px 10px; }
.calendar-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 2px; text-align: center; }
.days-of-week { font-size: 11px; opacity: 0.6; margin-bottom: 10px; font-weight: bold; }
.cal-day { padding: 8px 0; border-radius: 50%; cursor: pointer; font-size: 14px; transition: background 0.2s; }
.cal-day:hover:not(.empty) { background: var(--border); }
.cal-day.empty { cursor: default; }
.cal-day.today { background: var(--accent); color: #fff; font-weight: bold; }
.cal-day.selected { border: 2px solid var(--accent); }

.auth-body { display: flex; align-items: center; justify-content: center; }
.auth-box { background: var(--panel-bg); padding: 30px; border-radius: 12px; border: 1px solid var(--border); width: 90%; max-width: 350px; text-align: center; }
.auth-box h1 { margin-bottom: 20px; }
.auth-box input { width: 100%; padding: 10px; margin-bottom: 10px; border: 1px solid var(--border); border-radius: 6px; background: var(--bg); color: var(--text); }
.btn-primary { width: 100%; padding: 10px; background: var(--accent); color: #fff; border: none; border-radius: 6px; cursor: pointer; font-weight: bold; }
.auth-box p { margin-top: 15px; font-size: 14px; }
.auth-box a { color: var(--accent); }
.flash { background: var(--danger); color: white; padding: 10px; border-radius: 6px; margin-bottom: 15px; font-size: 14px; }
.admin-table { width: 100%; border-collapse: collapse; background: var(--panel-bg); }
.admin-table th, .admin-table td { border: 1px solid var(--border); padding: 10px; text-align: center; }

@media (max-width: 768px) {
    .main-container { flex-direction: column; }
    .sidebar { width: 100%; max-height: 30vh; border-right: none; border-bottom: 1px solid var(--border); padding: 10px; order: -1; }
    .today-box { display: none; } 
    .overdue-box { margin: 0; padding: 10px; flex: 1; overflow-y: auto; }
    .planner-area { height: 70vh; }
    .day-column { min-width: 100vw; width: 100vw; max-width: 100vw; flex-shrink: 0; }
    
    .header { padding: 10px; flex-direction: column; align-items: stretch; }
    .header-top { width: 100%; justify-content: space-between; }
    .header-controls { width: 100%; justify-content: center; flex-wrap: wrap; margin-left: 0; }
    .btn-today, .calendar-btn-wrapper, .btn-analytics { flex: 1; justify-content: center; padding: 8px; font-size: 12px; }
    .btn-theme { padding: 8px 12px; }
}