/* ============================================================
   TeleHealthConnect -- Modern Medical UI
   Blue / White / Teal healthcare theme
   ============================================================ */

/* ---------- CSS Variables ---------- */
:root {
    --primary: #0077B6;
    --primary-dark: #005F8A;
    --primary-light: #00A8E8;
    --secondary: #00B4D8;
    --teal: #0097A7;
    --teal-light: #26C6DA;
    --accent: #48CAE4;
    --success: #2E7D32;
    --success-light: #4CAF50;
    --warning: #F57C00;
    --warning-light: #FFB74D;
    --danger: #C62828;
    --danger-light: #EF5350;
    --info: #0288D1;
    --bg-primary: #F5F9FC;
    --bg-secondary: #FFFFFF;
    --bg-card: #FFFFFF;
    --bg-sidebar: #003459;
    --text-primary: #1A2B3C;
    --text-secondary: #5A6B7C;
    --text-light: #8A9BAC;
    --text-white: #FFFFFF;
    --border: #E0E8F0;
    --border-light: #F0F4F8;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 50%;
    --transition: all 0.2s ease;
    --font-sans: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-dark);
}

/* ---------- Loading Screen ---------- */
.loading-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    gap: 1rem;
    color: var(--primary);
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ---------- App Layout ---------- */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* ---------- Sidebar ---------- */
.sidebar {
    width: 260px;
    background: var(--bg-sidebar);
    color: var(--text-white);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    transition: var(--transition);
    overflow-y: auto;
}

.sidebar-brand {
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-brand .brand-icon {
    font-size: 1.75rem;
}

.sidebar-brand .brand-text {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.sidebar-brand .brand-sub {
    font-size: 0.7rem;
    opacity: 0.7;
    display: block;
}

.sidebar-nav {
    padding: 1rem 0;
    flex: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    gap: 0.75rem;
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-white);
}

.nav-item.active {
    background: rgba(255, 255, 255, 0.12);
    color: var(--text-white);
    border-left-color: var(--accent);
}

.nav-item .nav-icon {
    font-size: 1.1rem;
    width: 24px;
    text-align: center;
}

.sidebar-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.75rem;
    opacity: 0.5;
}

/* ---------- Main Content ---------- */
.main-content {
    flex: 1;
    margin-left: 260px;
    display: flex;
    flex-direction: column;
}

/* ---------- Top Bar ---------- */
.topbar {
    background: var(--bg-secondary);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: var(--shadow-sm);
}

.topbar-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.topbar-actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

/* ---------- Page Content ---------- */
.page-content {
    padding: 2rem;
    flex: 1;
}

/* ---------- Cards ---------- */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    overflow: hidden;
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-light);
    background: var(--bg-primary);
}

/* ---------- Stat Cards ---------- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.25rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    transition: var(--transition);
}

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

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.stat-icon.patients { background: rgba(0, 119, 182, 0.1); color: var(--primary); }
.stat-icon.doctors { background: rgba(0, 151, 167, 0.1); color: var(--teal); }
.stat-icon.appointments { background: rgba(245, 124, 0, 0.1); color: var(--warning); }
.stat-icon.consultations { background: rgba(46, 125, 50, 0.1); color: var(--success); }
.stat-icon.prescriptions { background: rgba(198, 40, 40, 0.1); color: var(--danger); }
.stat-icon.vitals { background: rgba(2, 136, 209, 0.1); color: var(--info); }

.stat-info { flex: 1; }

.stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.stat-change {
    font-size: 0.75rem;
    margin-top: 0.25rem;
}

.stat-change.positive { color: var(--success); }
.stat-change.negative { color: var(--danger); }

/* ---------- Tables ---------- */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    background: var(--bg-primary);
    padding: 0.75rem 1rem;
    text-align: left;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 2px solid var(--border);
}

.data-table td {
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--border-light);
    font-size: 0.9rem;
    color: var(--text-primary);
}

.data-table tr:hover td {
    background: rgba(0, 119, 182, 0.02);
}

.data-table .empty-row td {
    text-align: center;
    padding: 2rem;
    color: var(--text-light);
}

/* ---------- Status Badges ---------- */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.badge-scheduled { background: rgba(2, 136, 209, 0.1); color: var(--info); }
.badge-confirmed { background: rgba(0, 119, 182, 0.1); color: var(--primary); }
.badge-in_progress, .badge-in-progress { background: rgba(245, 124, 0, 0.1); color: var(--warning); }
.badge-completed { background: rgba(46, 125, 50, 0.1); color: var(--success); }
.badge-cancelled { background: rgba(198, 40, 40, 0.1); color: var(--danger); }
.badge-no_show, .badge-no-show { background: rgba(158, 158, 158, 0.1); color: #757575; }
.badge-waiting { background: rgba(255, 183, 77, 0.15); color: #E65100; }
.badge-video { background: rgba(0, 151, 167, 0.1); color: var(--teal); }

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-sans);
}

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

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

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

.btn-secondary:hover {
    background: var(--border-light);
}

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

.btn-success:hover {
    background: var(--success-light);
}

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

.btn-danger:hover {
    background: var(--danger-light);
}

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

.btn-teal:hover {
    background: var(--teal-light);
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8rem;
}

.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
}

/* ---------- Forms ---------- */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.375rem;
}

.form-control {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-family: var(--font-sans);
    color: var(--text-primary);
    background: var(--bg-secondary);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 119, 182, 0.1);
}

.form-control::placeholder {
    color: var(--text-light);
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%235A6B7C' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2rem;
}

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

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

.form-row-3 {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1rem;
}

/* ---------- Modal ---------- */
.modal-overlay {
    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;
    animation: fadeIn 0.2s ease;
}

.modal {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease;
}

.modal-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-light);
    padding: 0.25rem;
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-light);
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}

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

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

/* ---------- Toast / Notifications ---------- */
.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    padding: 0.875rem 1.25rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    box-shadow: var(--shadow-md);
    animation: slideIn 0.3s ease;
    max-width: 400px;
}

.toast-success { background: var(--success); color: white; }
.toast-error { background: var(--danger); color: white; }
.toast-info { background: var(--info); color: white; }
.toast-warning { background: var(--warning); color: white; }

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* ---------- Empty State ---------- */
.empty-state {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-light);
}

.empty-state .empty-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state p {
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

/* ---------- Detail View ---------- */
.detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.detail-item {
    padding: 0.75rem 0;
}

.detail-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

.detail-value {
    font-size: 0.95rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* ---------- Vital Signs ---------- */
.vitals-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
}

.vital-item {
    text-align: center;
    padding: 1rem;
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
}

.vital-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.vital-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.vital-unit {
    font-size: 0.7rem;
    color: var(--text-light);
}

.vital-item.alert {
    border-color: var(--danger-light);
    background: rgba(198, 40, 40, 0.03);
}

.vital-item.alert .vital-value {
    color: var(--danger);
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
    .sidebar {
        width: 0;
        overflow: hidden;
    }

    .sidebar.open {
        width: 260px;
    }

    .main-content {
        margin-left: 0;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }

    .form-row, .form-row-3 {
        grid-template-columns: 1fr;
    }

    .detail-grid {
        grid-template-columns: 1fr;
    }

    .page-content {
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
}