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

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #16a34a;
    --warning: #ea580c;
    --danger: #dc2626;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-500: #6b7280;
    --gray-700: #374151;
    --gray-900: #111827;
    --radius: 12px;
    --radius-lg: 16px;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--gray-100);
    color: var(--gray-900);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-size: 16px;
    line-height: 1.5;
}

/* Auth Pages */
.auth-page { display: flex; justify-content: center; align-items: center; background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 100%); min-height: 100vh; padding: 2rem; }
.auth-container { background: white; padding: 3rem; border-radius: var(--radius-lg); box-shadow: 0 20px 60px rgba(0,0,0,0.25); width: 100%; max-width: 480px; }
.auth-container h1 { text-align: center; margin-bottom: 0.5rem; color: var(--gray-900); font-size: 2rem; }
.auth-container .subtitle { text-align: center; color: var(--gray-500); margin-bottom: 2rem; font-size: 1.1rem; }
.auth-link { text-align: center; margin-top: 1.5rem; color: var(--gray-500); font-size: 1.05rem; }
.auth-link a { color: var(--primary); text-decoration: none; font-weight: 600; }
.auth-link a:hover { text-decoration: underline; }

/* Forms */
.form-group { margin-bottom: 1.25rem; }
.form-group label { display: block; margin-bottom: 0.5rem; font-weight: 600; font-size: 1rem; color: var(--gray-700); }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 0.85rem 1.1rem; border: 2px solid var(--gray-200); border-radius: var(--radius); font-size: 1.05rem; transition: border-color 0.2s, box-shadow 0.2s; background: white; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 4px rgba(37,99,235,0.12); }
.form-group textarea { resize: vertical; min-height: 100px; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 0.75rem 1.6rem; border: none; border-radius: var(--radius); font-size: 1rem; font-weight: 600; cursor: pointer; text-decoration: none; transition: background 0.2s, transform 0.15s, box-shadow 0.2s; gap: 0.4rem; }
.btn:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,0.15); }
.btn:active { transform: translateY(0); }
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: white; }
.btn-success:hover { background: #15803d; }
.btn-warning { background: var(--warning); color: white; }
.btn-warning:hover { background: #c2410c; }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: #b91c1c; }
.btn-secondary { background: var(--gray-200); color: var(--gray-700); }
.btn-secondary:hover { background: var(--gray-300); }
.btn-full { width: 100%; text-align: center; }
.btn-sm { padding: 0.5rem 1rem; font-size: 0.9rem; }
.btn-lg { padding: 0.9rem 2rem; font-size: 1.1rem; }

/* Alerts */
.alert { padding: 1rem 1.25rem; border-radius: var(--radius); margin-bottom: 1.25rem; font-size: 1rem; }
.alert-error { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; }
.alert-success { background: #f0fdf4; color: var(--success); border: 1px solid #bbf7d0; }

/* Navbar */
.navbar { background: white; padding: 1rem 2.5rem; display: flex; justify-content: space-between; align-items: center; box-shadow: 0 2px 12px rgba(0,0,0,0.08); position: sticky; top: 0; z-index: 100; }
.nav-brand { font-size: 1.5rem; font-weight: 700; color: var(--primary); text-decoration: none; }
.nav-links { display: flex; align-items: center; gap: 1.5rem; }
.nav-link { text-decoration: none; color: var(--gray-700); font-weight: 500; font-size: 1.05rem; }
.nav-link:hover { color: var(--primary); }
.nav-user { font-size: 1rem; color: var(--gray-500); }
.nav-logout { color: var(--danger) !important; }

/* Container */
.container { max-width: 100%; margin: 0 auto; padding: 1.5rem 2rem; flex: 1; width: 100%; }

/* Dashboard Header */
.dashboard-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.5rem; flex-wrap: wrap; gap: 1.25rem; }
.dashboard-header h1 { font-size: 1.85rem; }
.controls-row { display: flex; align-items: center; gap: 1.25rem; flex-wrap: wrap; }
.month-nav { display: flex; align-items: center; gap: 1.25rem; }
.month-nav h2 { font-size: 1.35rem; min-width: 220px; text-align: center; }
.month-nav .btn { padding: 0.6rem 1.1rem; font-size: 1rem; }

/* Filter bar */
.filter-bar { margin-bottom: 1.5rem; }
.filter-form { display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap; background: white; padding: 0.85rem 1.25rem; border-radius: var(--radius); box-shadow: 0 2px 8px rgba(0,0,0,0.05); }
.filter-form label { font-weight: 600; font-size: 0.95rem; color: var(--gray-700); }
.filter-form select { padding: 0.5rem 0.85rem; border: 2px solid var(--gray-200); border-radius: var(--radius); font-size: 0.95rem; background: white; cursor: pointer; }
.filter-form select:focus { outline: none; border-color: var(--primary); }

/* ===== CALENDAR ===== */
.calendar { background: white; border-radius: var(--radius-lg); box-shadow: 0 4px 20px rgba(0,0,0,0.06); overflow: hidden; }

.calendar-header { display: grid; grid-template-columns: repeat(7, 1fr); background: var(--primary); color: white; }
.calendar-header div { padding: 1.2rem; text-align: center; font-weight: 700; font-size: 1.1rem; }

.calendar-body { display: grid; grid-template-columns: repeat(7, 1fr); }

.calendar-day {
    min-height: 180px;
    border: 1px solid var(--gray-200);
    padding: 0.7rem;
    position: relative;
    transition: background 0.15s;
}
.calendar-day:hover { background: #f0f4ff; }
.calendar-day.other-month { background: var(--gray-50); color: var(--gray-300); }
.calendar-day.other-month:hover { background: var(--gray-50); }
.calendar-day.today { background: #eff6ff; border-color: var(--primary); }

.calendar-day .day-number { font-weight: 700; font-size: 1.1rem; margin-bottom: 0.4rem; color: var(--gray-700); }
.calendar-day.today .day-number { background: var(--primary); color: white; width: 32px; height: 32px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1rem; }

.day-link { text-decoration: none; color: inherit; }
.day-link:hover .day-number { color: var(--primary); }

/* Task inside calendar */
.cal-task { display: block; font-size: 0.88rem; padding: 0.35rem 0.6rem; margin-bottom: 3px; border-radius: 6px; text-decoration: none; color: white; line-height: 1.4; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; transition: opacity 0.2s; }
.cal-task:hover { opacity: 0.85; }
.cal-task.status-pending { background: var(--warning); }
.cal-task.status-in_progress { background: #2563eb; }
.cal-task.status-completed { background: var(--success); }
.cal-task .task-time { font-weight: 700; }
.cal-more { font-size: 0.8rem; color: var(--gray-500); font-weight: 600; padding: 0.1rem 0.3rem; }

/* ===== TASK LIST ===== */
.task-list { display: flex; flex-direction: column; gap: 0.85rem; }
.task-card { display: flex; justify-content: space-between; align-items: flex-start; background: var(--gray-50); padding: 1.1rem 1.25rem; border-radius: var(--radius); border-left: 5px solid var(--gray-300); transition: box-shadow 0.2s, transform 0.15s; }
.task-card:hover { box-shadow: 0 4px 16px rgba(0,0,0,0.08); transform: translateY(-1px); }
.task-card.status-pending { border-left-color: var(--warning); }
.task-card.status-in_progress { border-left-color: var(--primary); }
.task-card.status-completed { border-left-color: var(--success); }
.task-info { flex: 1; min-width: 0; }
.task-info h3 { font-size: 1.1rem; margin-bottom: 0.3rem; }
.task-info h3 a:hover { color: var(--primary); }
.task-info .task-meta { font-size: 0.9rem; color: var(--gray-500); margin-bottom: 0.35rem; display: flex; align-items: center; gap: 0.3rem; flex-wrap: wrap; }
.task-info .task-desc { font-size: 0.9rem; color: var(--gray-700); line-height: 1.5; }
.task-actions { display: flex; gap: 0.5rem; align-items: center; flex-shrink: 0; margin-left: 1rem; }

/* Status badges */
.status-badge { display: inline-block; padding: 0.25rem 0.75rem; border-radius: 20px; font-size: 0.85rem; font-weight: 600; color: white; }
.status-badge.pending { background: var(--warning); }
.status-badge.in_progress { background: var(--primary); }
.status-badge.completed { background: var(--success); }

/* Comments */
.comments-section { margin-top: 2rem; padding-top: 1.5rem; border-top: 2px solid var(--gray-200); }
.comments-section h3 { margin-bottom: 1rem; font-size: 1.2rem; }
.comment { background: var(--gray-50); padding: 1rem 1.25rem; border-radius: var(--radius); margin-bottom: 0.75rem; }
.comment .comment-meta { font-size: 0.9rem; color: var(--gray-500); margin-bottom: 0.35rem; }
.comment .comment-meta strong { color: var(--gray-700); }
.comment p { font-size: 1rem; line-height: 1.5; }
.comment-form { display: flex; gap: 0.75rem; margin-top: 1rem; }
.comment-form input { flex: 1; padding: 0.85rem 1.1rem; border: 2px solid var(--gray-200); border-radius: var(--radius); font-size: 1rem; transition: border-color 0.2s; }
.comment-form input:focus { outline: none; border-color: var(--primary); }

/* Task detail page */
.task-detail { background: white; border-radius: var(--radius-lg); padding: 2.5rem; box-shadow: 0 4px 20px rgba(0,0,0,0.06); }
.task-detail h1 { margin-bottom: 0.75rem; font-size: 1.85rem; }
.task-detail .task-meta { color: var(--gray-500); margin-bottom: 1.5rem; font-size: 1.05rem; display: flex; align-items: center; gap: 0.3rem; flex-wrap: wrap; }
.task-detail .task-description { margin-bottom: 2rem; line-height: 1.7; font-size: 1.05rem; }
.task-detail .task-status-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 2rem; flex-wrap: wrap; }
.task-detail .task-status-row strong { font-size: 1.05rem; }
.back-link { display: inline-flex; align-items: center; margin-bottom: 1.25rem; color: var(--primary); text-decoration: none; font-weight: 600; font-size: 1.05rem; gap: 0.3rem; }
.back-link:hover { text-decoration: underline; }

/* Footer */
.footer { text-align: center; padding: 1.5rem; color: var(--gray-500); font-size: 0.95rem; border-top: 1px solid var(--gray-200); margin-top: auto; }

/* ===== DAY PAGE ===== */
.day-page-header { margin-bottom: 2rem; }
.day-page-header .back-link { margin-bottom: 1rem; }
.day-page-top { display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 1.25rem; margin-bottom: 1.25rem; }
.day-page-title h1 { font-size: 2rem; margin-bottom: 0.25rem; }
.today-tag { display: inline-block; background: var(--success); color: white; padding: 0.2rem 0.75rem; border-radius: 20px; font-size: 0.8rem; font-weight: 700; letter-spacing: 0.5px; vertical-align: middle; }
.day-task-count { color: var(--gray-500); font-size: 1.05rem; margin-top: 0.25rem; }
.day-page-nav { display: flex; gap: 0.6rem; flex-wrap: wrap; }
.day-page-empty { text-align: center; padding: 5rem 2rem; background: white; border-radius: var(--radius-lg); box-shadow: 0 4px 20px rgba(0,0,0,0.06); }
.day-page-empty .empty-icon { font-size: 4rem; margin-bottom: 1rem; }
.day-page-empty h2 { font-size: 1.5rem; margin-bottom: 0.5rem; color: var(--gray-700); }
.day-page-empty p { color: var(--gray-500); font-size: 1.1rem; margin-bottom: 1.5rem; }

/* Day columns (kanban) */
.day-tasks-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; align-items: start; }
.day-column { background: white; border-radius: var(--radius-lg); box-shadow: 0 4px 20px rgba(0,0,0,0.06); overflow: hidden; }
.day-column-header { padding: 1rem 1.25rem; font-weight: 700; font-size: 1.05rem; display: flex; align-items: center; gap: 0.5rem; border-bottom: 2px solid var(--gray-200); }
.day-column-dot { width: 12px; height: 12px; border-radius: 50%; flex-shrink: 0; }
.day-column-header.pending .day-column-dot { background: var(--warning); }
.day-column-header.pending { color: var(--warning); }
.day-column-header.in_progress .day-column-dot { background: var(--primary); }
.day-column-header.in_progress { color: var(--primary); }
.day-column-header.completed .day-column-dot { background: var(--success); }
.day-column-header.completed { color: var(--success); }
.day-column-body { padding: 0.75rem; display: flex; flex-direction: column; gap: 0.6rem; min-height: 100px; }
.column-empty { color: var(--gray-400, #9ca3af); font-size: 0.9rem; text-align: center; padding: 2rem 0.5rem; font-style: italic; }

/* Task card footer with status buttons */
.task-card-footer { display: flex; justify-content: space-between; align-items: center; margin-top: 0.6rem; padding-top: 0.6rem; border-top: 1px solid var(--gray-200); }
.task-card-footer .task-actions { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-left: 0; }
.task-actions-right { display: flex; gap: 0.4rem; align-items: center; }
.status-btn { border: none; padding: 0.3rem 0.65rem; border-radius: 6px; font-size: 0.75rem; font-weight: 600; cursor: pointer; color: white; transition: opacity 0.2s, transform 0.1s; }
.status-btn:hover { opacity: 0.8; transform: translateY(-1px); }
.status-btn.pending { background: var(--warning); }
.status-btn.in_progress { background: var(--primary); }
.status-btn.completed { background: var(--success); }
.task-delete-btn { background: none; border: none; font-size: 1.2rem; color: var(--gray-400, #9ca3af); cursor: pointer; width: 28px; height: 28px; display: flex; align-items: center; justify-content: center; border-radius: 50%; transition: background 0.2s, color 0.2s; text-decoration: none; line-height: 1; }
.task-delete-btn:hover { background: #fef2f2; color: var(--danger); }

/* Responsive */
@media (max-width: 1100px) {
    .day-tasks-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .navbar { padding: 0.85rem 1.25rem; }
    .nav-brand { font-size: 1.25rem; }
    .container { padding: 1rem; }
    .dashboard-header h1 { font-size: 1.4rem; }
    .calendar-day { min-height: 100px; padding: 0.4rem; }
    .calendar-day .day-number { font-size: 0.95rem; }
    .cal-task { font-size: 0.75rem; padding: 0.25rem 0.4rem; }
    .task-card { flex-direction: column; padding: 1rem; }
    .task-actions { margin-left: 0; margin-top: 0.75rem; }
    .controls-row { width: 100%; justify-content: space-between; }
    .month-nav h2 { min-width: 160px; font-size: 1.1rem; }
    .task-detail { padding: 1.5rem; }
    .task-detail h1 { font-size: 1.4rem; }
    .comment-form { flex-direction: column; }
    .auth-container { padding: 2rem; }
    .auth-container h1 { font-size: 1.6rem; }
    .day-page-title h1 { font-size: 1.4rem; }
    .day-page-nav { width: 100%; }
}