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

:root {
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #93c5fd;
    --secondary-color: #0ea5e9;
    --secondary-dark: #0284c7;
    --danger-color: #ef4444;
    --danger-dark: #dc2626;
    --warning-color: #f59e0b;
    --warning-dark: #d97706;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --white: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #3b82f6 0%, #1e40af 50%, #0ea5e9 100%);
    min-height: 100vh;
    padding: 20px;
    line-height: 1.6;
    color: var(--gray-800);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    backdrop-filter: blur(10px);
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

header {
    background: linear-gradient(135deg, var(--gray-800) 0%, var(--gray-700) 100%);
    color: var(--white);
    padding: 40px 30px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.user-profile {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.user-avatar {
    position: relative;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    overflow: hidden;
    cursor: pointer;
    border: 3px solid var(--primary-color);
    transition: all 0.3s ease;
}

.user-avatar:hover {
    transform: scale(1.05);
    border-color: var(--primary-light);
}

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-placeholder {
    width: 100%;
    height: 100%;
    background: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: var(--white);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

#usernameInput {
    padding: 12px 16px;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius);
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    font-size: 16px;
    text-align: center;
    outline: none;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    flex: 1;
    min-width: 180px;
}

#usernameInput::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

#usernameInput:focus {
    border-color: var(--primary-color);
    background: rgba(255, 255, 255, 0.2);
}

.save-profile-btn {
    padding: 12px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 16px;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.save-profile-btn:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.save-profile-btn:active {
    transform: translateY(0);
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="75" cy="75" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="50" cy="10" r="0.5" fill="rgba(255,255,255,0.05)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

header h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--white) 0%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    z-index: 1;
}

.view-toggle {
    display: flex;
    justify-content: center;
    gap: 8px;
    position: relative;
    z-index: 1;
}

.view-btn {
    padding: 12px 24px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 500;
    backdrop-filter: blur(10px);
}

.view-btn.active,
.view-btn:hover {
    background: var(--white);
    color: var(--gray-800);
    border-color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.view-content {
    display: block;
    animation: fadeIn 0.4s ease-out;
}

.view-content.hidden {
    display: none;
}

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

.todo-input {
    padding: 30px;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
    align-items: center;
}

#todoInput {
    flex: 2;
    min-width: 200px;
    padding: 16px 20px;
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    font-size: 16px;
    outline: none;
    transition: all 0.3s ease;
    background: var(--white);
    box-shadow: var(--shadow-sm);
}

#dueDateInput,
#reminderInput {
    flex: 1;
    min-width: 150px;
    padding: 16px 20px;
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    font-size: 16px;
    outline: none;
    transition: all 0.3s ease;
    background: var(--white);
    box-shadow: var(--shadow-sm);
}

.mobile-button-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.file-input-wrapper {
    display: flex;
    align-items: center;
}

.photo-btn {
    padding: 16px;
    background: var(--secondary-color);
    color: var(--white);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 18px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.photo-btn:hover {
    background: var(--secondary-dark);
    transform: translateY(-2px);
}

#todoInput:focus,
#dueDateInput:focus,
#reminderInput:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    transform: translateY(-1px);
}

#dueDateInput:invalid,
#reminderInput:invalid {
    border-color: var(--danger-color);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.date-error {
    border-color: var(--danger-color) !important;
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1) !important;
}

#addBtn {
    padding: 16px 32px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--white);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
    min-width: 120px;
}

#addBtn:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

#addBtn:active {
    transform: translateY(0);
}

#addBtn .btn-text {
    display: inline;
}

#addBtn .btn-icon {
    display: none;
}

.filter-buttons {
    padding: 20px 30px;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
}

.filter-btn {
    padding: 10px 20px;
    border: 2px solid var(--gray-200);
    background: var(--white);
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    font-size: 14px;
    color: var(--gray-600);
    box-shadow: var(--shadow-sm);
}

.filter-btn.active {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--white);
    border-color: var(--primary-color);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.filter-btn:hover:not(.active) {
    background: var(--gray-50);
    border-color: var(--gray-300);
    transform: translateY(-1px);
}

.todo-list {
    list-style: none;
    padding: 0;
    max-height: 500px;
    overflow-y: auto;
    background: var(--white);
}

.todo-list::-webkit-scrollbar {
    width: 8px;
}

.todo-list::-webkit-scrollbar-track {
    background: var(--gray-100);
}

.todo-list::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: 4px;
}

.todo-list::-webkit-scrollbar-thumb:hover {
    background: var(--gray-400);
}

.todo-item {
    display: flex;
    align-items: center;
    padding: 20px 30px;
    border-bottom: 1px solid var(--gray-100);
    transition: all 0.3s ease;
    position: relative;
    background: var(--white);
}

.todo-item:hover {
    background: var(--gray-50);
    transform: translateX(4px);
}

.todo-item.completed {
    opacity: 0.7;
    background: var(--gray-50);
}

.todo-checkbox {
    width: 22px;
    height: 22px;
    margin-right: 16px;
    cursor: pointer;
    accent-color: var(--primary-color);
    transform: scale(1.2);
}

.todo-text {
    flex: 1;
    font-size: 16px;
    padding: 8px 12px;
    border: 2px solid transparent;
    background: transparent;
    outline: none;
    border-radius: var(--border-radius-sm);
    transition: all 0.3s ease;
    color: var(--gray-800);
    font-weight: 500;
}

.todo-text.completed {
    text-decoration: line-through;
    color: var(--gray-400);
}

.todo-text:focus {
    background: var(--white);
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.todo-due-date {
    font-size: 13px;
    color: var(--primary-color);
    margin-left: 12px;
    padding: 4px 12px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 20px;
    font-weight: 500;
    white-space: nowrap;
}

.todo-overdue {
    color: var(--danger-color) !important;
    background: rgba(239, 68, 68, 0.1) !important;
}

.todo-due-today {
    color: var(--warning-color) !important;
    background: rgba(245, 158, 11, 0.1) !important;
}

.todo-photo {
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius-sm);
    object-fit: cover;
    margin-left: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid var(--gray-200);
}

.todo-photo:hover {
    transform: scale(1.1);
    border-color: var(--primary-color);
}

.todo-reminder {
    font-size: 12px;
    color: var(--secondary-color);
    margin-left: 8px;
    padding: 4px 8px;
    background: rgba(14, 165, 233, 0.1);
    border-radius: 12px;
    font-weight: 500;
    white-space: nowrap;
}

.todo-reminder.active {
    background: var(--secondary-color);
    color: var(--white);
    animation: pulse 2s infinite;
}

.photo-modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
}

.photo-modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    max-width: 90%;
    max-height: 90%;
    border-radius: var(--border-radius);
    overflow: hidden;
}

.photo-modal img {
    width: 100%;
    height: auto;
    display: block;
}

.photo-modal-close {
    position: absolute;
    top: 15px;
    right: 20px;
    color: var(--white);
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.photo-modal-close:hover {
    background: rgba(0, 0, 0, 0.8);
}

.delete-btn {
    background: linear-gradient(135deg, var(--danger-color) 0%, var(--danger-dark) 100%);
    color: var(--white);
    border: none;
    padding: 8px 16px;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    opacity: 0;
    transition: all 0.3s ease;
    transform: translateX(10px);
}

.todo-item:hover .delete-btn {
    opacity: 1;
    transform: translateX(0);
}

.delete-btn:hover {
    background: linear-gradient(135deg, var(--danger-dark) 0%, var(--danger-color) 100%);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.todo-stats {
    padding: 25px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--gray-50);
    color: var(--gray-600);
    font-size: 15px;
    font-weight: 500;
    border-top: 1px solid var(--gray-200);
}

#clearCompleted {
    background: none;
    border: none;
    color: var(--danger-color);
    cursor: pointer;
    text-decoration: underline;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--border-radius-sm);
    transition: all 0.3s ease;
}

#clearCompleted:hover {
    color: var(--danger-dark);
    background: rgba(239, 68, 68, 0.1);
    text-decoration: none;
}

.empty-state {
    text-align: center;
    padding: 60px 40px;
    color: var(--gray-400);
    font-style: italic;
    font-size: 18px;
    background: var(--gray-50);
}

/* Calendar Styles */
.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 25px 30px;
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
    border-bottom: 1px solid var(--gray-200);
}

.calendar-header button {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--white);
    border: none;
    padding: 12px 16px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 18px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.calendar-header button:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.calendar-header h2 {
    margin: 0;
    color: var(--gray-800);
    font-size: 24px;
    font-weight: 700;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    background: var(--gray-200);
    margin: 0 30px 30px;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.calendar-day {
    background: var(--white);
    min-height: 100px;
    padding: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    display: flex;
    flex-direction: column;
}

.calendar-day:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: scale(1.02);
    z-index: 10;
    box-shadow: var(--shadow-lg);
}

.calendar-day.other-month {
    color: var(--gray-300);
    background: var(--gray-50);
}

.calendar-day.other-month:hover {
    background: var(--gray-100);
    color: var(--gray-400);
    transform: none;
}

.calendar-day.today {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--secondary-dark) 100%);
    color: var(--white);
    font-weight: 700;
    box-shadow: var(--shadow-md);
}

.calendar-day.today:hover {
    background: linear-gradient(135deg, var(--secondary-dark) 0%, var(--secondary-color) 100%);
}

.calendar-day.selected {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--white);
    box-shadow: var(--shadow-lg);
    transform: scale(1.02);
}

.calendar-day-number {
    font-weight: 700;
    margin-bottom: 8px;
    font-size: 16px;
}

.calendar-todo-count {
    position: absolute;
    top: 8px;
    right: 8px;
    background: linear-gradient(135deg, var(--warning-color) 0%, var(--warning-dark) 100%);
    color: var(--white);
    border-radius: 50%;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
    box-shadow: var(--shadow-sm);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

.calendar-day-header {
    background: linear-gradient(135deg, var(--gray-700) 0%, var(--gray-600) 100%);
    color: var(--white);
    padding: 16px 12px;
    text-align: center;
    font-weight: 700;
    font-size: 14px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.selected-date-todos {
    padding: 30px;
    border-top: 1px solid var(--gray-200);
    background: var(--white);
}

.selected-date-todos h3 {
    margin-bottom: 20px;
    color: var(--gray-800);
    font-size: 20px;
    font-weight: 700;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-color);
    display: inline-block;
}

/* Responsive design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .container {
        margin: 0;
        border-radius: var(--border-radius);
    }
    
    header {
        padding: 25px 15px;
    }
    
    header h1 {
        font-size: 2.2rem;
        margin-bottom: 15px;
    }
    
    .user-profile {
        flex-direction: column;
        gap: 15px;
        margin-bottom: 15px;
    }
    
    .user-info {
        flex-direction: row;
        gap: 10px;
        width: 100%;
        justify-content: center;
    }
    
    #usernameInput {
        min-width: auto;
        flex: 1;
        max-width: 200px;
        text-align: left;
    }
    
    .save-profile-btn {
        flex-shrink: 0;
    }
    
    .user-info {
        flex-direction: column;
        gap: 10px;
        width: 100%;
    }
    
    #usernameInput {
        min-width: auto;
        width: 100%;
        max-width: 280px;
    }
    
    .save-profile-btn {
        align-self: center;
    }
    
    .user-avatar {
        width: 60px;
        height: 60px;
    }
    
    .avatar-placeholder {
        font-size: 24px;
    }
    
    .view-toggle {
        flex-direction: row;
        gap: 8px;
        justify-content: center;
    }
    
    .view-btn {
        padding: 8px 16px;
        font-size: 14px;
        flex: 1;
        max-width: 120px;
    }
    
    .todo-input {
        flex-direction: column;
        padding: 20px 15px;
        gap: 15px;
    }
    
    #todoInput,
    #dueDateInput,
    #reminderInput {
        min-width: auto;
        flex: none;
        width: 100%;
    }
    
    .mobile-button-row {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 20px;
        margin-top: 10px;
    }
    
    .photo-btn {
        width: 60px;
        height: 60px;
        border-radius: 50%;
        font-size: 24px;
        box-shadow: var(--shadow-lg);
    }
    
    .photo-btn:hover {
        transform: translateY(-3px) scale(1.05);
        box-shadow: var(--shadow-xl);
    }
    
    .file-input-wrapper {
        align-self: auto;
    }
    
    #addBtn {
        width: 60px;
        height: 60px;
        padding: 0;
        font-size: 24px;
        font-weight: 400;
        border-radius: 50%;
        min-width: auto;
        display: flex;
        align-items: center;
        justify-content: center;
        margin-top: 0;
        box-shadow: var(--shadow-lg);
    }
    
    #addBtn:hover {
        transform: translateY(-3px) scale(1.05);
        box-shadow: var(--shadow-xl);
    }
    
    #addBtn:active {
        transform: translateY(-1px) scale(1.02);
    }
    
    #addBtn .btn-text {
        display: none;
    }
    
    #addBtn .btn-icon {
        display: inline;
    }
    
    .filter-buttons {
        padding: 15px;
        gap: 8px;
        justify-content: center;
    }
    
    .filter-btn {
        font-size: 12px;
        padding: 8px 12px;
        flex: 1;
        min-width: 60px;
        text-align: center;
    }
    
    .todo-item {
        padding: 15px;
        flex-wrap: wrap;
        gap: 8px;
    }
    
    .todo-text {
        width: 100%;
        margin: 5px 0;
    }
    
    .todo-photo {
        width: 35px;
        height: 35px;
        order: 1;
    }
    
    .todo-due-date,
    .todo-reminder {
        font-size: 11px;
        margin: 2px 4px;
        order: 2;
        flex-basis: auto;
    }
    
    .delete-btn {
        order: 3;
        opacity: 1;
        transform: translateX(0);
        margin-top: 5px;
    }
    
    .todo-stats {
        flex-direction: column;
        gap: 15px;
        text-align: center;
        padding: 20px 15px;
    }
    
    .calendar-grid {
        margin: 0 10px 15px;
    }
    
    .calendar-day {
        min-height: 65px;
        font-size: 13px;
        padding: 6px;
    }
    
    .calendar-day-number {
        font-size: 14px;
    }
    
    .calendar-todo-count {
        width: 18px;
        height: 18px;
        font-size: 10px;
        top: 4px;
        right: 4px;
    }
    
    .calendar-header,
    .selected-date-todos {
        padding: 15px;
    }
    
    .calendar-header h2 {
        font-size: 18px;
    }
    
    .calendar-header button {
        width: 36px;
        height: 36px;
        font-size: 14px;
    }
    
    .selected-date-todos h3 {
        font-size: 18px;
    }
}

@media (max-width: 480px) {
    header {
        padding: 20px 10px;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    .user-avatar {
        width: 50px;
        height: 50px;
    }
    
    .avatar-placeholder {
        font-size: 20px;
    }
    
    .view-btn {
        padding: 6px 12px;
        font-size: 13px;
    }
    
    .todo-input {
        padding: 15px 10px;
    }
    
    .mobile-button-row {
        gap: 15px;
    }
    
    #addBtn {
        width: 56px;
        height: 56px;
        font-size: 22px;
        position: relative;
        z-index: 10;
    }
    
    .photo-btn {
        width: 56px;
        height: 56px;
        font-size: 20px;
    }
    
    #addBtn:hover {
        transform: translateY(-2px) scale(1.03);
    }
    
    .filter-buttons {
        padding: 10px;
        flex-wrap: wrap;
    }
    
    .filter-btn {
        font-size: 11px;
        padding: 6px 10px;
        min-width: 55px;
    }
    
    .todo-item {
        padding: 12px 10px;
    }
    
    .todo-checkbox {
        width: 18px;
        height: 18px;
    }
    
    .todo-photo {
        width: 30px;
        height: 30px;
    }
    
    .calendar-day {
        min-height: 55px;
        padding: 4px;
        font-size: 12px;
    }
    
    .calendar-day-number {
        font-size: 13px;
    }
    
    .calendar-todo-count {
        width: 16px;
        height: 16px;
        font-size: 9px;
    }
    
    .calendar-header h2 {
        font-size: 16px;
    }
    
    .calendar-header button {
        width: 32px;
        height: 32px;
        font-size: 12px;
    }
    
    .photo-modal-content {
        max-width: 95%;
        max-height: 95%;
    }
    
    .photo-modal-close {
        width: 35px;
        height: 35px;
        font-size: 24px;
        top: 10px;
        right: 15px;
    }
}