:root {
    --primary-color: #2196F3;
    --success-color: #4CAF50;
    --warning-color: #FFC107;
    --danger-color: #F44336;
    --purple-color: #9C27B0;
    --white: #ffffff;
    --light-gray: #f5f5f5;
    --medium-gray: #e0e0e0;
    --dark-gray: #757575;
    --text-dark: #212121;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 8px rgba(0,0,0,0.15);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    background-attachment: fixed;
    color: var(--text-dark);
    line-height: 1.6;
    padding-bottom: 80px;
    min-height: 100vh;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 1px 1px, rgba(255,255,255,0.15) 1px, transparent 0);
    background-size: 20px 20px;
    pointer-events: none;
    z-index: -1;
}

.header {
    background: linear-gradient(135deg, var(--primary-color), var(--purple-color));
    color: var(--white);
    padding: 1.5rem 0;
    text-align: center;
    box-shadow: var(--shadow-lg);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content h1 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.header-content p {
    opacity: 0.9;
    font-size: 0.9rem;
}

.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

.content-section {
    display: none;
    animation: fadeIn 0.3s ease-in;
}

.content-section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.welcome-card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
    text-align: center;
    background-image: linear-gradient(45deg, transparent 49%, rgba(255,255,255,0.1) 50%, transparent 51%);
}

.welcome-card h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.stat-card {
    background: linear-gradient(135deg, var(--light-gray), var(--white));
    padding: 1.5rem;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.stat-card i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-number {
    display: block;
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--text-dark);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--dark-gray);
}

.quick-actions {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.quick-actions h3 {
    color: var(--text-dark);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

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

.action-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--purple-color));
    color: var(--white);
    border: none;
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.booking-container,
.appointments-container,
.calendar-container,
.settings-container {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 1rem;
}

.booking-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--medium-gray);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

.submit-btn {
    background: linear-gradient(135deg, var(--success-color), #45a049);
    color: var(--white);
    border: none;
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    margin-top: 1rem;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.appointments-filters {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.5rem 1rem;
    border: 2px solid var(--medium-gray);
    background: var(--white);
    color: var(--text-dark);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.filter-btn.active,
.filter-btn:hover {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

.appointments-list {
    display: grid;
    gap: 1rem;
}

.appointment-card {
    background: var(--light-gray);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    border-left: 4px solid var(--primary-color);
    transition: var(--transition);
    cursor: pointer;
}

.appointment-card:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.appointment-card.past {
    border-left-color: var(--dark-gray);
    opacity: 0.7;
}

.appointment-card.cancelled {
    border-left-color: var(--danger-color);
    background: #ffebee;
}

.appointment-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.appointment-info h3 {
    color: var(--text-dark);
    margin-bottom: 0.25rem;
    font-size: 1.1rem;
}

.appointment-info p {
    color: var(--dark-gray);
    font-size: 0.9rem;
}

.appointment-status {
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.status-upcoming {
    background: #e3f2fd;
    color: var(--primary-color);
}

.status-past {
    background: #f5f5f5;
    color: var(--dark-gray);
}

.status-cancelled {
    background: #ffebee;
    color: var(--danger-color);
}

.appointment-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.btn-small {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.btn-reschedule {
    background: var(--warning-color);
    color: var(--white);
}

.btn-cancel {
    background: var(--danger-color);
    color: var(--white);
}

.btn-small:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.calendar-nav-btn {
    background: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 0.5rem;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.calendar-nav-btn:hover {
    background: var(--purple-color);
    transform: scale(1.1);
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    background: var(--medium-gray);
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: 1rem;
}

.calendar-day {
    background: var(--white);
    padding: 1rem 0.5rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    min-height: 60px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
}

.calendar-day:hover {
    background: var(--light-gray);
}

.calendar-day.other-month {
    color: var(--dark-gray);
    background: #fafafa;
}

.calendar-day.today {
    background: var(--primary-color);
    color: var(--white);
}

.calendar-day.has-appointments {
    background: #e8f5e8;
    border-left: 3px solid var(--success-color);
}

.calendar-day.unavailable {
    background: #ffebee;
    color: var(--danger-color);
    cursor: not-allowed;
}

.calendar-legend {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.legend-color {
    width: 16px;
    height: 16px;
    border-radius: 4px;
}

.legend-color.available {
    background: var(--white);
    border: 2px solid var(--medium-gray);
}

.legend-color.booked {
    background: #e8f5e8;
    border: 2px solid var(--success-color);
}

.legend-color.unavailable {
    background: #ffebee;
    border: 2px solid var(--danger-color);
}

.settings-group {
    margin-bottom: 2rem;
}

.settings-group h3 {
    color: var(--text-dark);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.setting-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--medium-gray);
    transition: var(--transition);
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: var(--white);
    transition: var(--transition);
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--primary-color);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

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

.time-setting {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.time-setting label {
    min-width: 60px;
    font-weight: 500;
}

.time-setting input {
    flex: 1;
    padding: 0.5rem;
    border: 2px solid var(--medium-gray);
    border-radius: var(--border-radius);
}

.settings-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-right: 1rem;
    margin-bottom: 0.5rem;
}

.settings-btn {
    background: var(--primary-color);
    color: var(--white);
}

.settings-btn.danger {
    background: var(--danger-color);
}

.settings-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.faq-section {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin: 1rem;
    box-shadow: var(--shadow);
}

.faq-section h2 {
    text-align: center;
    color: var(--text-dark);
    margin-bottom: 2rem;
    font-size: 1.5rem;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--medium-gray);
    margin-bottom: 0.5rem;
}

.faq-question {
    width: 100%;
    padding: 1.5rem 0;
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-dark);
    transition: var(--transition);
}

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

.faq-icon {
    font-size: 1.2rem;
    font-weight: bold;
    transition: var(--transition);
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding-bottom: 1.5rem;
    color: var(--dark-gray);
    line-height: 1.7;
    animation: slideDown 0.3s ease-out;
}

.faq-answer[hidden] {
    display: none;
}

@keyframes slideDown {
    from {
        opacity: 0;
        max-height: 0;
    }
    to {
        opacity: 1;
        max-height: 200px;
    }
}

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--white);
    display: flex;
    justify-content: space-around;
    padding: 0.5rem 0;
    box-shadow: 0 -2px 8px rgba(0,0,0,0.1);
    z-index: 1000;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.5rem;
    color: var(--dark-gray);
    text-decoration: none;
    transition: var(--transition);
    border-radius: var(--border-radius);
    min-width: 60px;
}

.nav-item.active,
.nav-item:hover {
    color: var(--primary-color);
    background: rgba(33, 150, 243, 0.1);
}

.nav-item i {
    font-size: 1.2rem;
    margin-bottom: 0.25rem;
}

.nav-item span {
    font-size: 0.7rem;
    font-weight: 500;
}

.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    animation: fadeIn 0.3s ease-out;
}

.modal-content {
    background-color: var(--white);
    margin: 10% auto;
    padding: 2rem;
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 500px;
    position: relative;
    animation: slideIn 0.3s ease-out;
}

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

.close {
    position: absolute;
    right: 1rem;
    top: 1rem;
    font-size: 1.5rem;
    font-weight: bold;
    cursor: pointer;
    color: var(--dark-gray);
    transition: var(--transition);
}

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

.toast {
    position: fixed;
    top: 100px;
    right: 1rem;
    background: var(--text-dark);
    color: var(--white);
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    transform: translateX(400px);
    transition: var(--transition);
    z-index: 3000;
    max-width: 300px;
}

.toast.show {
    transform: translateX(0);
}

.toast.success {
    background: var(--success-color);
}

.toast.error {
    background: var(--danger-color);
}

.toast.warning {
    background: var(--warning-color);
}

footer {
    text-align: center;
    padding: 2rem 1rem;
    background: var(--light-gray);
    color: var(--dark-gray);
    font-size: 0.9rem;
    margin-top: 2rem;
}

@media (max-width: 768px) {
    .header-content h1 {
        font-size: 1.5rem;
    }
    
    .main-content {
        padding: 0.5rem;
    }
    
    .welcome-card,
    .booking-container,
    .appointments-container,
    .calendar-container,
    .settings-container {
        padding: 1rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .action-buttons {
        grid-template-columns: 1fr;
    }
    
    .appointments-filters {
        justify-content: center;
    }
    
    .filter-btn {
        font-size: 0.8rem;
        padding: 0.4rem 0.8rem;
    }
    
    .appointment-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .appointment-actions {
        width: 100%;
        justify-content: flex-start;
    }
    
    .calendar-day {
        min-height: 50px;
        font-size: 0.9rem;
    }
    
    .working-hours {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        margin: 20% auto;
        width: 95%;
        padding: 1.5rem;
    }
    
    .nav-item span {
        font-size: 0.6rem;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .calendar-grid {
        gap: 0;
    }
    
    .calendar-day {
        min-height: 40px;
        font-size: 0.8rem;
        padding: 0.5rem 0.25rem;
    }
    
    .legend-item {
        font-size: 0.8rem;
    }
    
    .faq-question {
        font-size: 0.9rem;
        padding: 1rem 0;
    }
}

.no-appointments {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--dark-gray);
}

.no-appointments i {
    font-size: 3rem;
    color: var(--medium-gray);
    margin-bottom: 1rem;
}

.loading {
    text-align: center;
    padding: 2rem;
    color: var(--dark-gray);
}

.loading i {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}