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

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #ffeaa7 0%, #fab1a0 100%);
    min-height: 100vh;
    color: #2d3436;
}

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

/* 헤더 */
header {
    text-align: center;
    margin-bottom: 30px;
    background: rgba(255, 255, 255, 0.9);
    padding: 20px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 2.5rem;
    color: #6c5ce7;
    margin-bottom: 15px;
    font-weight: 300;
}

.view-toggle {
    display: flex;
    justify-content: center;
    gap: 10px;
}

.view-toggle button {
    padding: 10px 20px;
    border: none;
    border-radius: 25px;
    background: #ddd6fe;
    color: #6c5ce7;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.view-toggle button.active,
.view-toggle button:hover {
    background: #6c5ce7;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(108, 92, 231, 0.3);
}

/* 할 일 추가 폼 */
.add-todo-form {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    background: rgba(255, 255, 255, 0.9);
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.add-todo-form input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid #e17055;
    border-radius: 10px;
    font-size: 1rem;
    outline: none;
    transition: all 0.3s ease;
}

.add-todo-form input:focus {
    border-color: #6c5ce7;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(108, 92, 231, 0.2);
}

.add-todo-form button {
    padding: 12px 24px;
    background: #00b894;
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.add-todo-form button:hover {
    background: #00a085;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 184, 148, 0.3);
}

/* 뷰 전환 */
.view {
    display: none;
}

.view.active {
    display: block;
}

/* 리스트 뷰 */
.todo-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.todo-item {
    background: rgba(255, 255, 255, 0.95);
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
}

.todo-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.15);
}

.todo-item.completed {
    opacity: 0.7;
    background: #f8f9fa;
}

.todo-item.completed .todo-text {
    text-decoration: line-through;
    color: #636e72;
}

.todo-content {
    flex: 1;
}

.todo-text {
    font-size: 1.1rem;
    margin-bottom: 5px;
    color: #2d3436;
}

.todo-date {
    font-size: 0.9rem;
    color: #636e72;
}

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

.todo-actions button {
    padding: 8px 16px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.complete-btn {
    background: #00b894;
    color: white;
}

.complete-btn:hover {
    background: #00a085;
    transform: scale(1.05);
}

.edit-btn {
    background: #fdcb6e;
    color: white;
}

.edit-btn:hover {
    background: #f39c12;
    transform: scale(1.05);
}

.delete-btn {
    background: #e17055;
    color: white;
}

.delete-btn:hover {
    background: #d63031;
    transform: scale(1.05);
}

/* 달력 뷰 */
.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    background: rgba(255, 255, 255, 0.9);
    padding: 15px 20px;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.calendar-header button {
    padding: 10px 15px;
    background: #6c5ce7;
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s ease;
}

.calendar-header button:hover {
    background: #5f3dc4;
    transform: scale(1.1);
}

.calendar-header h2 {
    color: #6c5ce7;
    font-size: 1.5rem;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 5px;
    background: rgba(255, 255, 255, 0.9);
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

.calendar-day {
    min-height: 80px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    cursor: pointer;
    border-radius: 10px;
    position: relative;
    transition: all 0.3s ease;
    font-weight: 500;
    padding: 8px;
}

.calendar-day:hover {
    background: #ddd6fe;
    transform: scale(1.05);
}

.calendar-day.selected {
    background: #6c5ce7;
    color: white;
}

.calendar-day.other-month {
    color: #b2bec3;
}

.calendar-day-number {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: #2d3436;
}

.calendar-todo-item {
    font-size: 0.7rem;
    background: #00b894;
    color: white;
    padding: 2px 6px;
    border-radius: 8px;
    margin-bottom: 2px;
    width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    line-height: 1.2;
}

.calendar-todo-item.completed {
    background: #b2bec3;
    text-decoration: line-through;
}

.calendar-todo-more {
    font-size: 0.6rem;
    color: #636e72;
    font-style: italic;
}

.calendar-day-header {
    font-weight: bold;
    color: #6c5ce7;
    background: #f8f9fa;
    min-height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.selected-date-todos {
    background: rgba(255, 255, 255, 0.9);
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.selected-date-todos h3 {
    color: #6c5ce7;
    margin-bottom: 15px;
    font-size: 1.3rem;
}

/* 모달 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

.modal-content {
    background: white;
    margin: 15% auto;
    padding: 30px;
    border-radius: 20px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: modalSlideIn 0.3s ease;
}

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

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
}

.close:hover {
    color: #e17055;
}

.modal-content h2 {
    color: #6c5ce7;
    margin-bottom: 20px;
    text-align: center;
}

.modal-content input {
    width: 100%;
    padding: 12px 16px;
    margin-bottom: 15px;
    border: 2px solid #ddd6fe;
    border-radius: 10px;
    font-size: 1rem;
    outline: none;
    transition: all 0.3s ease;
}

.modal-content input:focus {
    border-color: #6c5ce7;
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.1);
}

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

.modal-buttons button {
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
}

#saveEditBtn {
    background: #00b894;
    color: white;
}

#saveEditBtn:hover {
    background: #00a085;
    transform: translateY(-2px);
}

#cancelEditBtn {
    background: #636e72;
    color: white;
}

#cancelEditBtn:hover {
    background: #2d3436;
    transform: translateY(-2px);
}

/* 반응형 디자인 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .add-todo-form {
        flex-direction: column;
    }
    
    .todo-item {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .calendar-grid {
        gap: 2px;
        padding: 10px;
    }
    
    .modal-content {
        margin: 30% auto;
        padding: 20px;
    }
}