:root {
    --primary-color: #03045E;
    --secondary-color: #023E8A;
    --accent-color: #0077B6;
    --light-accent: #0096C7;
    --lightest: #90E0EF;
    --white: #FFFFFF;
    --light-gray: #F8F9FA;
    --gray: #6C757D;
    --dark-gray: #495057;
    --success: #28A745;
    --danger: #DC3545;
    --warning: #FFC107;
    
    --shadow: 0 2px 10px rgba(3, 4, 94, 0.1);
    --shadow-hover: 0 4px 20px rgba(3, 4, 94, 0.15);
    --border-radius: 12px;
    --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, var(--lightest) 0%, var(--white) 100%);
    background-attachment: fixed;
    color: var(--dark-gray);
    line-height: 1.6;
    padding-bottom: 80px;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(3, 4, 94, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(0, 119, 182, 0.03) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

.app-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 1rem;
    text-align: center;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.app-header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

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

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

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

.quick-schedule {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
}

.quick-schedule::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-color), var(--light-accent));
}

.quick-schedule h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
}

.schedule-form {
    display: grid;
    gap: 1rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 500;
    color: var(--dark-gray);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.75rem;
    border: 2px solid #E9ECEF;
    border-radius: 8px;
    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(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 119, 182, 0.1);
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--accent-color), var(--light-accent));
    color: var(--white);
    border: none;
    padding: 0.875rem 1.5rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1rem;
}

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

.btn-secondary {
    background: var(--light-gray);
    color: var(--dark-gray);
    border: 2px solid #E9ECEF;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-secondary:hover {
    background: #E9ECEF;
    border-color: var(--gray);
}

.btn-danger {
    background: var(--danger);
    color: var(--white);
    border: none;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-danger:hover {
    background: #C82333;
    transform: translateY(-1px);
}

.availability-grid {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.availability-grid h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.grid-display {
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--light-gray);
    border-radius: 8px;
    color: var(--gray);
    font-style: italic;
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    background: var(--white);
    padding: 1rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.calendar-header h2 {
    color: var(--primary-color);
    font-size: 1.3rem;
}

.calendar-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.calendar-controls span {
    font-weight: 500;
    color: var(--dark-gray);
    min-width: 150px;
    text-align: center;
}

.calendar-grid {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    margin-bottom: 2rem;
}

.calendar-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    background: var(--primary-color);
    color: var(--white);
}

.calendar-day-header {
    padding: 1rem 0.5rem;
    text-align: center;
    font-weight: 500;
    font-size: 0.9rem;
}

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

.calendar-date {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid #E9ECEF;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.calendar-date:hover {
    background: var(--lightest);
}

.calendar-date.today {
    background: var(--accent-color);
    color: var(--white);
    font-weight: 600;
}

.calendar-date.has-meeting::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background: var(--warning);
    border-radius: 50%;
}

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

.meetings-list h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.meetings-container {
    display: grid;
    gap: 1rem;
}

.meeting-item {
    padding: 1rem;
    background: var(--light-gray);
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.meeting-item:hover {
    background: #E9ECEF;
    transform: translateX(4px);
}

.meeting-info h4 {
    color: var(--dark-gray);
    margin-bottom: 0.25rem;
}

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

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

.btn-small {
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.templates-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    background: var(--white);
    padding: 1rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.templates-header h2 {
    color: var(--primary-color);
    font-size: 1.3rem;
}

.templates-grid {
    display: grid;
    gap: 1rem;
    margin-bottom: 2rem;
}

.template-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
}

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

.template-card h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.template-card p {
    color: var(--gray);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

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

.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--white);
    border-radius: var(--border-radius);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid #E9ECEF;
}

.modal-header h3 {
    color: var(--primary-color);
    margin: 0;
}

.btn-close {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--gray);
    padding: 0.5rem;
    border-radius: 4px;
    transition: var(--transition);
}

.btn-close:hover {
    background: var(--light-gray);
    color: var(--dark-gray);
}

.modal form {
    padding: 1.5rem;
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 1.5rem;
}

.settings-group {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

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

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

.setting-item:last-child {
    margin-bottom: 0;
}

.settings-input {
    padding: 0.5rem;
    border: 2px solid #E9ECEF;
    border-radius: 6px;
    font-size: 0.9rem;
    min-width: 200px;
}

.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

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

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: var(--transition);
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: var(--transition);
    border-radius: 50%;
}

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

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

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

.faq-section h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
    font-size: 1.4rem;
}

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

.faq-item {
    border-bottom: 1px solid #E9ECEF;
    margin-bottom: 1rem;
}

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

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

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

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

.faq-answer {
    padding-bottom: 1rem;
    color: var(--gray);
    line-height: 1.6;
    animation: fadeIn 0.3s ease-in-out;
}

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

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--white);
    border-top: 1px solid #E9ECEF;
    display: flex;
    justify-content: space-around;
    padding: 0.5rem 0;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    z-index: 100;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--gray);
    transition: var(--transition);
    padding: 0.5rem;
    border-radius: 8px;
    min-width: 60px;
}

.nav-item.active {
    color: var(--accent-color);
    background: rgba(0, 119, 182, 0.1);
}

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

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

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

@media (min-width: 768px) {
    .app-main {
        padding: 2rem;
    }
    
    .form-row {
        grid-template-columns: 1fr 1fr;
    }
    
    .templates-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
    
    .calendar-date {
        padding: 1rem 0.5rem;
    }
    
    .modal-content {
        max-width: 600px;
    }
    
    .bottom-nav {
        max-width: 400px;
        left: 50%;
        transform: translateX(-50%);
        border-radius: var(--border-radius) var(--border-radius) 0 0;
    }
}

@media (min-width: 1024px) {
    .app-header h1 {
        font-size: 1.8rem;
    }
    
    .quick-schedule,
    .availability-grid {
        padding: 2rem;
    }
    
    .schedule-form {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .schedule-form .form-group:nth-child(1),
    .schedule-form .form-group:nth-child(5),
    .schedule-form .form-group:nth-child(6) {
        grid-column: 1 / -1;
    }
}

.availability-visual {
    display: grid;
    grid-template-columns: auto repeat(7, 1fr);
    gap: 1px;
    background: #E9ECEF;
    border-radius: 8px;
    overflow: hidden;
    margin-top: 1rem;
}

.time-slot {
    padding: 0.5rem;
    text-align: center;
    font-size: 0.8rem;
    background: var(--white);
}

.time-label {
    background: var(--light-gray);
    font-weight: 500;
    color: var(--dark-gray);
}

.day-header {
    background: var(--primary-color);
    color: var(--white);
    font-weight: 500;
}

.slot-free {
    background: rgba(40, 167, 69, 0.2);
    color: var(--success);
}

.slot-busy {
    background: rgba(220, 53, 69, 0.2);
    color: var(--danger);
}

.slot-partial {
    background: rgba(255, 193, 7, 0.2);
    color: #856404;
}

.video-container {
    position: relative;
    background: #000;
    border-radius: 8px;
    overflow: hidden;
    margin: 1rem 0;
}

.video-container video {
    width: 100%;
    height: auto;
}

.video-controls {
    position: absolute;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 0.5rem;
}

.video-btn {
    background: rgba(0, 0, 0, 0.7);
    color: var(--white);
    border: none;
    padding: 0.5rem;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
}

.video-btn:hover {
    background: rgba(0, 0, 0, 0.9);
}

.notification-popup {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--white);
    border-left: 4px solid var(--accent-color);
    padding: 1rem;
    border-radius: 8px;
    box-shadow: var(--shadow-hover);
    z-index: 1001;
    max-width: 300px;
    transform: translateX(400px);
    transition: var(--transition);
}

.notification-popup.show {
    transform: translateX(0);
}

.notification-popup .close-notification {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--gray);
}

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

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--light-accent);
}

.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    color: var(--gray);
}

.loading::after {
    content: '';
    width: 20px;
    height: 20px;
    border: 2px solid var(--light-accent);
    border-top: 2px solid var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: 0.5rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}