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

:root {
    --primary-color: #4F46E5;
    --primary-dark: #4338CA;
    --secondary-color: #6366F1;
    --danger-color: #EF4444;
    --success-color: #10B981;
    --bg-color: #F9FAFB;
    --card-bg: #FFFFFF;
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --border-color: #E5E7EB;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    margin: 0;
    padding: 0;
}

header h1 {
    font-family: 'Heebo', 'Assistant', sans-serif;
    font-weight: 700;
}

header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 1.5rem 0;
    box-shadow: var(--shadow-lg);
}

.header-content {
    max-width: 100%;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
}

header h1 {
    font-size: 2rem;
    font-weight: 600;
}

main {
    max-width: 100%;
    margin: 1.5rem auto;
    padding: 0 1.5rem;
}

.controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background-color: white;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-color);
}

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

.btn-danger:hover {
    background-color: #DC2626;
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.icon {
    font-size: 1.25rem;
    font-weight: bold;
}

.calendar-container {
    background: var(--card-bg);
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    padding: 1.5rem;
    margin: 0;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1rem;
}

.day-card {
    min-width: 0;
    background: var(--bg-color);
    border-radius: 0.5rem;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    transition: all 0.2s;
}

.day-card.today {
    background: linear-gradient(135deg, #f0f4ff 0%, #e8f0fe 100%);
    border: 2px solid var(--primary-color);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.15);
}

.day-card.today .day-name {
    color: var(--primary-color);
}

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

.day-card.today:hover {
    box-shadow: 0 6px 16px rgba(79, 70, 229, 0.2);
}

.day-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border-color);
}

.day-name {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.day-date {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.appointments-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-height: 70vh;
    overflow-y: auto;
    padding-right: 0.5rem;
}

.appointments-list.medium {
    gap: 0.875rem;
}

.appointments-list.many {
    gap: 0.75rem;
}

.appointments-list.very-many {
    gap: 0.5rem;
}

.appointments-list::-webkit-scrollbar {
    width: 6px;
}

.appointments-list::-webkit-scrollbar-track {
    background: transparent;
}

.appointments-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.appointments-list::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

.appointment-item {
    background: white;
    padding: 1.25rem;
    border-radius: 0.5rem;
    border-left: 4px solid var(--primary-color);
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: var(--shadow);
    flex-shrink: 0;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.appointment-item.medium {
    padding: 1rem;
}

.appointment-item.many {
    padding: 0.875rem;
}

.appointment-item.very-many {
    padding: 0.75rem;
}

.appointment-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-lg);
}

.appointment-time {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.position-badge {
    background: var(--primary-color);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.125rem 0.5rem;
    border-radius: 0.25rem;
    line-height: 1.5;
}

.appointment-item.medium .appointment-time {
    font-size: 1rem;
    margin-bottom: 0.4rem;
}

.appointment-item.many .appointment-time {
    font-size: 0.9375rem;
    margin-bottom: 0.35rem;
}

.appointment-item.very-many .appointment-time {
    font-size: 0.875rem;
    margin-bottom: 0.3rem;
}

.appointment-phone {
    color: var(--text-secondary);
    font-size: 1rem;
}

.appointment-item.medium .appointment-phone {
    font-size: 0.9375rem;
}

.appointment-item.many .appointment-phone {
    font-size: 0.875rem;
}

.appointment-item.very-many .appointment-phone {
    font-size: 0.8125rem;
}

.appointment-name {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 1rem;
    margin-top: 0.5rem;
}

.appointment-item.medium .appointment-name {
    font-size: 0.9375rem;
    margin-top: 0.4rem;
}

.appointment-item.many .appointment-name {
    font-size: 0.875rem;
    margin-top: 0.35rem;
}

.appointment-item.very-many .appointment-name {
    font-size: 0.8125rem;
    margin-top: 0.3rem;
}

.no-appointments {
    text-align: center;
    color: var(--text-secondary);
    padding: 3rem 2rem;
    font-style: italic;
    font-size: 1rem;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--card-bg);
    border-radius: 0.75rem;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: modalSlideIn 0.3s ease-out;
    margin: 1rem;
}

.modal-large {
    max-width: 700px;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

.close-btn {
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.25rem;
    transition: all 0.2s;
}

.close-btn:hover {
    background-color: var(--bg-color);
    color: var(--text-primary);
}

form {
    padding: 1.5rem;
}

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

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

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: all 0.2s;
}

.form-group input[type="checkbox"] {
    width: auto;
    min-width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.customer-info {
    padding: 1rem 1.5rem;
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1rem;
}

.customer-info h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.customer-info p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.operating-hours-day {
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--bg-color);
    border-radius: 0.5rem;
}

.operating-hours-day h4 {
    margin-bottom: 0.75rem;
    text-transform: capitalize;
}

.time-slots {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

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

.time-slot input {
    flex: 1;
}

.remove-slot-btn {
    padding: 0.5rem;
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 0.25rem;
    cursor: pointer;
}

.add-slot-btn {
    margin-top: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--success-color);
    color: white;
    border: none;
    border-radius: 0.25rem;
    cursor: pointer;
    font-size: 0.875rem;
}

.override-item {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.override-item input {
    flex: 1;
}

.override-list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: var(--bg-color);
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
}

.contacts-list {
    padding: 1.5rem;
    max-height: 60vh;
    overflow-y: auto;
}

.contact-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--bg-color);
    border-radius: 0.5rem;
    margin-bottom: 0.75rem;
    border: 1px solid var(--border-color);
}

.contact-info {
    flex: 1;
}

.contact-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.contact-phone {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

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

.no-contacts {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
    font-style: italic;
}

/* Tablet and smaller desktop */
@media (max-width: 1200px) {
    .calendar-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 0.875rem;
    }
    
    .calendar-container {
        padding: 1.25rem;
    }
    
    .day-card {
        padding: 1.25rem;
    }
}

/* Tablet portrait and large phones */
@media (max-width: 968px) {
    .calendar-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    header {
        padding: 1.25rem 0;
    }
    
    header h1 {
        font-size: 1.75rem;
    }
    
    .header-content {
        padding: 0 1.25rem;
    }
    
    main {
        padding: 0 1.25rem;
        margin: 1rem auto;
    }
    
    .controls {
        gap: 0.75rem;
        margin-bottom: 1.5rem;
    }
    
    .btn {
        padding: 0.625rem 1.25rem;
        font-size: 0.9375rem;
    }
}

/* Mobile landscape and small tablets */
@media (max-width: 768px) {
    .calendar-container {
        padding: 1rem;
        border-radius: 0.5rem;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: thin;
    }
    
    .calendar-container::-webkit-scrollbar {
        height: 6px;
    }
    
    .calendar-container::-webkit-scrollbar-track {
        background: var(--bg-color);
        border-radius: 3px;
    }
    
    .calendar-container::-webkit-scrollbar-thumb {
        background: var(--border-color);
        border-radius: 3px;
    }
    
    .calendar-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
        min-width: min-content;
    }
    
    .day-card {
        padding: 1rem;
        min-width: 0;
    }
    
    .day-header {
        margin-bottom: 1rem;
        padding-bottom: 0.75rem;
    }
    
    .day-name {
        font-size: 1.25rem;
    }
    
    .day-date {
        font-size: 0.875rem;
    }
    
    .appointments-list {
        max-height: 60vh;
        gap: 0.75rem;
    }
    
    .appointment-item {
        padding: 1rem;
    }
    
    header {
        padding: 1rem 0;
    }
    
    header h1 {
        font-size: 1.5rem;
    }
    
    .header-content {
        padding: 0 1rem;
        gap: 0.75rem;
    }
    
    .logo-placeholder svg {
        width: 32px;
        height: 32px;
    }
    
    main {
        padding: 0 1rem;
        margin: 1rem auto;
    }
    
    .controls {
        flex-direction: column;
        gap: 0.75rem;
        margin-bottom: 1.25rem;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
        padding: 0.875rem 1.5rem;
    }
    
    .modal-content {
        margin: 0.5rem;
        max-width: calc(100% - 1rem);
        border-radius: 0.5rem;
    }
    
    .modal-header {
        padding: 1.25rem;
    }
    
    .modal-header h2 {
        font-size: 1.25rem;
    }
    
    form {
        padding: 1.25rem;
    }
    
    .form-group {
        margin-bottom: 1.25rem;
    }
    
    .form-actions {
        flex-direction: column-reverse;
        gap: 0.75rem;
        margin-top: 1.5rem;
        padding-top: 1.25rem;
    }
    
    .form-actions .btn {
        width: 100%;
    }
}

/* Small mobile phones */
@media (max-width: 480px) {
    .calendar-grid {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }
    
    .calendar-container {
        padding: 0.75rem;
    }
    
    .day-card {
        padding: 1rem;
    }
    
    .day-name {
        font-size: 1.125rem;
    }
    
    .day-date {
        font-size: 0.8125rem;
    }
    
    .appointments-list {
        max-height: 50vh;
        gap: 0.625rem;
    }
    
    .appointment-item {
        padding: 0.875rem;
    }
    
    .appointment-time {
        font-size: 1rem;
    }
    
    .appointment-phone,
    .appointment-name {
        font-size: 0.875rem;
    }
    
    header {
        padding: 0.875rem 0;
    }
    
    header h1 {
        font-size: 1.25rem;
    }
    
    .header-content {
        padding: 0 0.875rem;
        gap: 0.625rem;
    }
    
    .logo-placeholder svg {
        width: 28px;
        height: 28px;
    }
    
    main {
        padding: 0 0.875rem;
        margin: 0.75rem auto;
    }
    
    .controls {
        margin-bottom: 1rem;
    }
    
    .btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.875rem;
    }
    
    .modal-content {
        margin: 0.5rem;
        max-width: calc(100% - 1rem);
        max-height: 95vh;
    }
    
    .modal-header {
        padding: 1rem;
    }
    
    .modal-header h2 {
        font-size: 1.125rem;
    }
    
    form {
        padding: 1rem;
    }
    
    .form-group label {
        font-size: 0.9375rem;
        margin-bottom: 0.375rem;
    }
    
    .form-group input,
    .form-group select {
        padding: 0.625rem;
        font-size: 0.9375rem;
    }
    
    .customer-info {
        padding: 0.875rem 1rem;
    }
    
    .customer-info h3 {
        font-size: 1rem;
    }
    
    .customer-info p {
        font-size: 0.8125rem;
    }
}

/* Very small screens */
@media (max-width: 360px) {
    header h1 {
        font-size: 1.125rem;
    }
    
    .logo-placeholder svg {
        width: 24px;
        height: 24px;
    }
    
    .day-card {
        padding: 0.875rem;
    }
    
    .appointment-item {
        padding: 0.75rem;
    }
}