/* 기본 스타일 및 변수 */
:root {
    --primary-color: #4caf50;
    --primary-dark: #388e3c;
    --primary-light: #c8e6c9;
    --accent-color: #ff9800;
    --text-color: #333;
    --text-light: #757575;
    --background-color: #f5f5f5;
    --card-color: #fff;
    --border-color: #e0e0e0;
    --shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    --priority-high: #f44336;
    --priority-medium: #ff9800;
    --priority-low: #4caf50;
    --transition: all 0.3s ease;
}

/* 다크 모드 변수 */
[data-theme="dark"] {
    --primary-color: #81c784;
    --primary-dark: #4caf50;
    --primary-light: #1b5e20;
    --accent-color: #ffb74d;
    --text-color: #f5f5f5;
    --text-light: #bdbdbd;
    --background-color: #121212;
    --card-color: #1e1e1e;
    --border-color: #333;
    --shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: var(--transition);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 헤더 스타일 */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--primary-color);
}

header h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
}

/* 테마 토글 스위치 */
.theme-toggle {
    position: relative;
    width: 60px;
    height: 30px;
    background-color: var(--primary-color);
    border-radius: 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 5px;
    cursor: pointer;
}

.theme-toggle i {
    color: var(--card-color);
    font-size: 14px;
    z-index: 1;
}

.toggle-ball {
    position: absolute;
    width: 24px;
    height: 24px;
    background-color: var(--card-color);
    border-radius: 50%;
    left: 3px;
    transition: var(--transition);
}

[data-theme="dark"] .toggle-ball {
    left: 33px;
}

/* 입력 폼 스타일 */
.task-input-container {
    background-color: var(--card-color);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 30px;
    box-shadow: var(--shadow);
}

#task-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 100%;
}

input, textarea, select {
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--card-color);
    color: var(--text-color);
    font-size: 1rem;
    transition: var(--transition);
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px var(--primary-light);
}

textarea {
    resize: vertical;
    min-height: 80px;
}

.task-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.date-priority-container {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.date-container, .priority-container, .tag-container {
    display: flex;
    flex-direction: column;
    gap: 5px;
    flex: 1;
}

.date-input-container {
    display: flex;
    align-items: center;
    gap: 5px;
}

.date-input-container button {
    padding: 8px;
    background-color: var(--primary-light);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
}

.custom-date-container {
    display: flex;
    gap: 5px;
    margin-top: 5px;
}

.custom-date-container input {
    flex: 1;
}

.custom-date-container button {
    padding: 8px 12px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
}

label {
    font-weight: 600;
    color: var(--text-light);
}

button {
    padding: 12px 20px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
}

button:hover {
    background-color: var(--primary-dark);
}

#add-task-btn {
    align-self: flex-end;
}

/* 필터 스타일 */
.filter-container {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
    flex-wrap: wrap;
    background-color: var(--card-color);
    padding: 15px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
    flex: 1;
    min-width: 150px;
}

/* 할 일 목록 스타일 */
.tasks-container {
    background-color: var(--card-color);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 30px;
    box-shadow: var(--shadow);
}

.tasks-container h2 {
    margin-bottom: 15px;
    color: var(--primary-color);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

#task-list {
    list-style: none;
}

.task-item {
    background-color: var(--background-color);
    border-radius: 6px;
    padding: 15px;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
    border-left: 4px solid var(--priority-medium);
}

.task-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.task-item.priority-high {
    border-left-color: var(--priority-high);
}

.task-item.priority-medium {
    border-left-color: var(--priority-medium);
}

.task-item.priority-low {
    border-left-color: var(--priority-low);
}

.task-item.completed {
    opacity: 0.7;
    text-decoration: line-through;
}

.task-item.overdue {
    background-color: rgba(244, 67, 54, 0.1);
}

.task-content {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 10px;
}

.task-checkbox {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.task-title {
    font-weight: 600;
    flex: 1;
}

.task-meta {
    display: flex;
    gap: 15px;
    align-items: center;
    color: var(--text-light);
    font-size: 0.9rem;
}

.task-due-date, .task-tags {
    display: flex;
    align-items: center;
    gap: 5px;
}

.task-actions {
    display: flex;
    gap: 10px;
}

.task-actions button {
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    padding: 5px;
    font-size: 1rem;
    transition: var(--transition);
}

.task-actions button:hover {
    color: var(--primary-color);
}

.tag {
    background-color: var(--primary-light);
    color: var(--card-color);
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    white-space: nowrap;
}

/* 통계 스타일 */
.statistics-container {
    background-color: var(--card-color);
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--shadow);
}

.statistics-container h2 {
    margin-bottom: 15px;
    color: var(--primary-color);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.stat-box {
    background-color: var(--background-color);
    border-radius: 6px;
    padding: 15px;
    text-align: center;
}

.stat-box h3 {
    font-size: 1rem;
    color: var(--text-light);
    margin-bottom: 10px;
}

.stat-box p {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* 모달 스타일 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    overflow: auto;
}

.modal-content {
    background-color: var(--card-color);
    margin: 10% auto;
    padding: 25px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    width: 80%;
    max-width: 600px;
    position: relative;
    animation: modalFadeIn 0.3s;
}

@keyframes modalFadeIn {
    from { opacity: 0; transform: translateY(-50px); }
    to { opacity: 1; transform: translateY(0); }
}

.close {
    position: absolute;
    right: 20px;
    top: 15px;
    font-size: 28px;
    font-weight: bold;
    color: var(--text-light);
    cursor: pointer;
}

.close:hover {
    color: var(--primary-color);
}

#modal-title {
    margin-bottom: 20px;
    color: var(--primary-color);
}

#modal-task-details {
    margin-bottom: 20px;
}

.detail-item {
    margin-bottom: 15px;
}

.detail-item h3 {
    font-size: 1rem;
    color: var(--text-light);
    margin-bottom: 5px;
}

.detail-item p {
    font-size: 1.1rem;
}

.modal-buttons {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

#delete-task-btn {
    background-color: #f44336;
}

#delete-task-btn:hover {
    background-color: #d32f2f;
}

/* 반응형 스타일 */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    header h1 {
        font-size: 2rem;
    }

    .date-priority-container {
        flex-direction: column;
    }

    .filter-container {
        flex-direction: column;
    }

    .modal-content {
        width: 95%;
        margin: 5% auto;
    }
}

/* 애니메이션 */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn 0.5s;
}