:root {
    --primary-color: #2c3e50;
    --secondary-color: #00897b;
    --accent-color: #4db6ac;
    --danger-color: #e74c3c;
    --text-color: #333;
    --text-color-light: #888;
    --bg-color: #f9f9f9;
    --card-bg: #ffffff;
    --border-color: #e0e0e0;
    --footer-text-color: #aaa;
    --heatmap-0: #ebedf0;
    --heatmap-1: #c6e48b;
    --heatmap-2: #7bc96f;
    --heatmap-3: #239a3b;
    --heatmap-4: #196127;
    --heatmap-5: #0d4416;
    --transition: all 0.3s ease;
    --shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
    --shadow-light: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.dark-mode {
    --text-color: #e0e0e0;
    --text-color-light: #8a8a9e;
    --bg-color: #1a1a2e;
    --card-bg: #1e1e3f;
    --border-color: #3a3a5e;
    --footer-text-color: #55587a;
    --heatmap-0: #2d333b;
    --heatmap-1: #0e4429;
    --heatmap-2: #006d32;
    --heatmap-3: #26a641;
    --heatmap-4: #39d353;
    --heatmap-5: #a3ffb3;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background-color: var(--bg-color); color: var(--text-color); line-height: 1.6; padding: 20px; max-width: 1200px; margin: 0 auto; transition: var(--transition); }
header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 30px; padding-bottom: 15px; border-bottom: 1px solid var(--border-color); position: relative; }

.title-container { display: flex; align-items: center; gap: 15px; }
.header-icon { width: 40px; height: 40px; }
.header-icon .bg { fill: var(--card-bg); transition: var(--transition); }
.header-icon .stroke { stroke: var(--secondary-color); transition: var(--transition); }
.app-title { font-size: 1.8rem; font-weight: 600; background: linear-gradient(135deg, var(--secondary-color), var(--accent-color)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

.controls { display: flex; gap: 10px; }
.btn, .btn-link { background-color: var(--card-bg); color: var(--text-color); border: 1px solid var(--border-color); padding: 12px; border-radius: 8px; cursor: pointer; font-size: 0.9rem; display: flex; align-items: center; justify-content: center; width: 45px; height: 45px; box-shadow: 0 3px 6px rgba(0,0,0,0.05); transition: transform 0.2s, background-color 0.2s; text-decoration: none; }
.btn:hover, .btn-link:hover { transform: translateY(-2px); background-color: rgba(0, 137, 123, 0.05); }
.btn-link i { font-size: 1.2rem; }
.card { background-color: var(--card-bg); border-radius: 16px; box-shadow: var(--shadow); padding: 20px; margin-bottom: 30px; border: 1px solid var(--border-color); transition: var(--transition); }
.heatmap-container { max-width: 600px; margin: 0 auto; }
.month-selector { display: flex; justify-content: space-between; align-items: center; width: 100%; margin-bottom: 20px; }
.month-btn { background: var(--card-bg); border: 1px solid var(--border-color); font-size: 1.2rem; cursor: pointer; color: var(--text-color); width: 40px; height: 40px; border-radius: 50%; display: flex; align-items: center; justify-content: center; transition: background-color 0.2s, transform 0.2s; }
.month-btn:hover { background-color: rgba(0, 137, 123, 0.1); transform: scale(1.05); }
.current-month { font-weight: 600; font-size: 1.2rem; }
.heatmap { display: grid; grid-template-columns: repeat(7, 1fr); gap: 5px; width: 100%; }
.day-cell { width: 100%; aspect-ratio: 1/1; border-radius: 5px; cursor: pointer; position: relative; background-color: var(--heatmap-0); transition: transform 0.2s; }
.day-cell:hover { transform: scale(1.15); z-index: 2; }
.day-cell.today { border: 2px solid var(--accent-color); }
.day-cell.selected { outline: 3px solid var(--secondary-color); outline-offset: 2px; }
#event-input { flex: 1; min-width: 0; padding: 14px 18px; border-radius: 12px; border: 1px solid var(--border-color); background-color: var(--card-bg); color: var(--text-color); font-size: 1.1rem; }

#events-list { transition: all 0.3s ease; display: flex; flex-direction: column; gap: 12px; min-height: 220px; }
.event-item, .type-item { background-color: var(--bg-color); padding: 15px; border-radius: 12px; display: flex; align-items: center; gap: 15px; transition: all 0.4s ease; overflow: hidden; border: 1px solid var(--border-color); box-shadow: var(--shadow-light); }
.event-item:hover, .type-item:hover { transform: translateY(-3px) scale(1.01); box-shadow: var(--shadow); }
.event-item.adding { opacity: 0; transform: translateY(20px); max-height: 0; }
.event-item.removing { opacity: 0; transform: scale(0.95); max-height: 0 !important; padding-top: 0; padding-bottom: 0; margin-bottom: 0; border-width: 0; }

.event-icon, .type-icon { font-size: 1.6rem; width: 45px; height: 45px; display: flex; align-items: center; justify-content: center; border-radius: 10px; background: var(--card-bg); flex-shrink: 0; }
.event-details, .type-details { flex-grow: 1; display: flex; flex-direction: column; min-width: 0; }
.event-name, .type-name { font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.event-time { font-size: 0.8rem; color: var(--text-color-light); }
.event-actions, .type-actions { display: flex; margin-left: auto; align-items: center; gap: 5px; opacity: 0; transition: opacity 0.2s; }
.event-item:hover .event-actions, .type-item:hover .type-actions { opacity: 1; }
.event-action-btn, .type-action-btn { background: none; border: none; color: var(--text-color-light); cursor: pointer; width: 35px; height: 35px; display: flex; align-items: center; justify-content: center; transition: color 0.2s, background-color 0.2s; font-size: 1rem; border-radius: 50%; }
.event-action-btn.delete:hover, .type-action-btn.delete:hover { color: var(--danger-color); background-color: rgba(231, 76, 60, 0.1); }
.event-action-btn.edit:hover, .type-action-btn.edit:hover { color: var(--secondary-color); background-color: rgba(0, 137, 123, 0.1); }
.type-item[data-is-default="true"] .type-action-btn.delete { display: none; }

.empty-state { text-align: center; padding: 40px 20px; color: var(--text-color-light); border-radius: 12px; display: flex; flex-direction: column; justify-content: center; align-items: center; height: 100%; }
.empty-state i { font-size: 2.5rem; margin-bottom: 15px; display: block; color: var(--accent-color); }
.empty-state p { font-size: 1.1rem; font-weight: 500; margin-bottom: 5px; color: var(--text-color); }
.empty-state small { font-size: 0.9rem; }

.tooltip { position: absolute; background-color: rgba(0, 0, 0, 0.85); color: white; padding: 8px 12px; border-radius: 6px; font-size: 0.85rem; z-index: 10; pointer-events: none; transform: translate(-50%, -130%); width: max-content; text-align: center; opacity: 0; transition: opacity 0.2s, transform 0.2s; }
.day-cell:hover .tooltip { opacity: 1; transform: translate(-50%, -140%); }
.year-heatmap-container { display: flex; justify-content: center; }
.year-heatmap-wrapper { overflow: hidden; }
.year-heatmap { display: grid; grid-auto-flow: column; grid-template-rows: repeat(7, 14px); grid-template-columns: repeat(53, 14px); gap: 4px; transform-origin: top left; transition: transform 0.2s ease; }
.year-day-cell { border-radius: 3px; background-color: var(--heatmap-0); cursor: pointer; }
.menu-container { position: relative; }
.menu-content { display: none; position: absolute; right: 0; top: 55px; background-color: var(--card-bg); min-width: 220px; box-shadow: 0 8px 16px rgba(0,0,0,0.2); z-index: 10; border-radius: 8px; overflow: hidden; border: 1px solid var(--border-color); animation: fadeIn 0.3s ease; }
.menu-item { padding: 12px 20px; display: flex; align-items: center; gap: 15px; cursor: pointer; font-size: 0.95rem; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }
.menu-content.show { display: block; }
.menu-divider { height: 1px; background-color: var(--border-color); margin: 5px 0; }

.modal { display: none; position: fixed; z-index: 1000; left: 0; top: 0; width: 100%; height: 100%; background-color: rgba(0,0,0,0.7); align-items: center; justify-content: center; }
.modal.show { display: flex; }
.modal-content { background-color: var(--card-bg); padding: 0; border-radius: 16px; max-width: 90vw; width: 500px; max-height: 90vh; box-shadow: 0 10px 30px rgba(0,0,0,0.3); display: flex; flex-direction: column; transition: width 0.3s ease; }
.modal-content.modal-wide { width: 1100px; }
.modal-body { overflow-y: auto; padding: 20px 20px 10px 20px; }
.modal-header { padding: 15px 20px; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border-color); flex-shrink: 0; }
.modal-title { font-size: 1.3rem; font-weight: 600; }
.close-modal { background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--text-color); }
.preview-container { display: flex; flex-direction: column; gap: 20px; }
.preview-heatmap { background: var(--card-bg); padding: 15px; border-radius: 12px; border: 1px solid var(--border-color); overflow: hidden; }
#preview-heatmap .month-selector { display: none; } /* Hide month navigation in static preview */
.preview-chart { height: 300px; width: 100%; }
.modal-actions { display: flex; justify-content: flex-end; gap: 15px; margin-top: 20px; padding: 15px 20px; border-top: 1px solid var(--border-color); flex-shrink: 0; }

.quick-buttons { display: flex; justify-content: center; flex-wrap: wrap; gap: 15px; margin-bottom: 30px; }
.event-btn { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 50%; width: 50px; height: 50px; font-size: 1.5rem; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: transform 0.2s; }
.event-btn.pulse { animation: pulse 0.4s ease; }
@keyframes pulse { 0% { transform: scale(1); } 50% { transform: scale(1.2); } 100% { transform: scale(1); } }

.modal-btn { padding: 10px 20px; border-radius: 8px; border: none; cursor: pointer; font-size: 1rem; }
.modal-btn.save, .modal-btn.migrate { background-color: var(--secondary-color); color: white; }
.modal-btn.create, .modal-btn.submit { background-color: var(--accent-color); color: white; }
.modal-btn.cancel { background-color: #e0e0e0; color: #333; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 8px; font-weight: 500; }
.form-group input, .form-group select { width: 100%; padding: 12px 15px; border-radius: 12px; border: 1px solid var(--border-color); background-color: var(--bg-color); color: var(--text-color); font-size: 1.1rem; }
#types-list { list-style: none; padding: 0; display: flex; flex-direction: column; gap: 10px; }

footer { margin-top: 40px; text-align: center; color: var(--footer-text-color); font-size: 0.9rem; transition: color 0.3s ease; }

@media (max-width: 1024px) { .modal-content.modal-wide { width: 90vw; } }
@media (max-width: 768px) { header { flex-direction: column; gap: 20px; align-items: flex-start; } .title-container { width: 100%; } .controls { width: 100%; justify-content: flex-end; } .card { padding: 20px; } }

.lang-option {
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 4px;
    transition: background-color 0.2s;
}
.lang-option:hover {
    background-color: rgba(0,0,0,0.05);
}
.lang-option.active {
    background-color: var(--secondary-color);
    color: white;
    font-weight: bold;
}
.dark-mode .lang-option:hover {
    background-color: rgba(255,255,255,0.1);
}
.dark-mode .lang-option.active {
    color: var(--card-bg);
}