/* Base styles for Black & White Rich Theme */
:root {
    --primary-color: #151515;         /* Deep black for primary accent */
    --success-color: #2e2e2e;         /* Dark gray for success */
    --warning-color: #666666;         /* Medium gray for warnings */
    --danger-color: #232323;          /* Almost black for danger */
    --info-color: #333333;            /* Standard dark gray for info */
    --light-color: #fff;              /* Pure white for backgrounds */
    --dark-color: #000;               /* Pure black for text and border */
    /* Additional contrast shades */
    --bw-border: #d9d9d9;
    --bw-alt-bg: #f5f5f5;
}

/* Utility classes */
.min-vh-75 {
    min-height: 75vh;
}

/* Hospital and Doctor Cards */
.hospital-card, .doctor-card {
    background: var(--light-color);
    color: var(--dark-color);
    border: 1px solid var(--bw-border);
    box-shadow: 0 2px 10px rgba(0,0,0,0.04);
    transition: transform 0.2s, box-shadow 0.2s;
}
.hospital-card:hover, .doctor-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.12);
    border-color: var(--primary-color);
}

.doctors-list {
    max-height: 300px;
    overflow-y: auto;
    background: var(--bw-alt-bg);
}

/* Doctor item styling */
.doctor-item {
    transition: background 0.2s;
}
.doctor-item:hover {
    background: #f0f0f0 !important;
}

/* Appointment Cards */
.appointment-card {
    border-left: 4px solid var(--primary-color);
    border-radius: 0.25rem;
    background: var(--light-color);
    color: var(--dark-color);
    transition: border-left-color 0.3s;
}
.appointment-card .badge {
    border-left: 4px solid #888888;
}

.appointment-card .badge.bg-success { border-left-color: var(--success-color);}
.appointment-card .badge.bg-warning { border-left-color: var(--warning-color);}
.appointment-card .badge.bg-danger  { border-left-color: var(--danger-color);}

/* Feature icons */
.feature-icon {
    height: 80px;
    color: var(--primary-color);
    background: var(--bw-alt-bg);
    border-radius: 50%;
    border: 1px solid var(--bw-border);
}

/* Hero section */
.hero-section {
    background: linear-gradient(135deg, #262626 0%, #111111 100%);
    color: white;
}

/* Step numbers */
.step-number {
    font-weight: 600;
    color: var(--dark-color);
    background: var(--bw-alt-bg);
    border-radius: 50%;
    padding: 0.3em 0.7em;
    box-shadow: 0 2px 6px rgba(0,0,0,0.06);
    transition: transform 0.2s;
}
.step-number:hover {
    background: #eaeaea;
    transform: scale(1.1);
}

/* Form enhancements */
.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(30,30,30,0.07);
}
.form-control {
    background: var(--light-color);
    color: var(--dark-color);
    border: 1px solid var(--bw-border);
}

/* Button enhancements */
.btn {
    background: var(--primary-color);
    color: var(--light-color);
    border: none;
    transition: all 0.2s;
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(0,0,0,0.10);
}
.btn:hover:enabled, .btn:focus {
    background: #000;
    color: #fff;
    transform: translateY(-1px);
}
.btn-light {
    background-color: var(--bw-alt-bg);
    color: var(--primary-color);
}
.btn[disabled] {
    cursor: not-allowed;
    opacity: 0.6;
}

/* Responsive typography */
@media (max-width: 768px) {
    .display-4 { font-size: 2.5rem;}
    .display-6 { font-size: 2rem;}
    .lead      { font-size: 1.05rem;}
}

/* Appointment details styling */
.appointment-details {
    background: #fafafa;
    border: 1px solid #ededed;
    color: var(--dark-color);
}

/* Status badges */
.badge {
    color: #fff;
    background: var(--dark-color);
    font-weight: 500;
    letter-spacing: 0.5px;
    border-radius: 0.45rem;
}

/* Doctor availability indicator */
.availability-status {
    position: relative;
    padding-left: 22px;
    color: var(--dark-color);
}
.availability-status::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: #ececec;
    border: 2px solid var(--primary-color);
}
.availability-status.unavailable::before {
    background: #888888;
    border: 2px solid var(--danger-color);
}

/* Search and filter enhancements */
.search-container {
    position: relative;
}
.search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: #ababab;
}
.search-input {
    padding-left: 40px;
    background: #f7f7f7;
    color: var(--dark-color);
    border: 1px solid #eaeaea;
}

/* Mobile-first responsive adjustments */
@media (max-width: 576px) {
    .container      { padding-left: 1rem; padding-right: 1rem; }
    .card-body      { padding: 1rem; }
    .btn-lg         { padding: 0.75rem 1.5rem; font-size: 1rem; }
    .display-6      { font-size: 1.75rem; }
}

/* Print styles */
@media print {
    .navbar, .btn, footer     { display: none !important;}
    .card, .appointment-card  { border: 1px solid #000; box-shadow: none; }
    .appointment-card {
        page-break-inside: avoid;
    }
}

/* Accessibility enhancements */
.btn:focus, .form-control:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .card { border: 2px solid var(--dark-color);}
    .text-muted { color: var(--dark-color) !important;}
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important;}
}

/* PWA / Mobile / Touch Optimizations */
.navbar { padding-top: env(safe-area-inset-top);}
@media (display-mode: standalone) {
    .navbar       { padding-top: calc(env(safe-area-inset-top) + 0.5rem);}
    body          { padding-bottom: env(safe-area-inset-bottom);}
    .container    { padding-bottom: calc(env(safe-area-inset-bottom) + 1rem);}
}
.btn, .card, .form-control { min-height: 44px; }
@media (max-width: 768px) {
    .btn           { padding: 0.8rem 1.25rem; font-size: 1rem;}
    .form-control  { padding: 0.8rem; font-size: 16px;}
    .card          { margin-bottom: 1rem;}
    .nav-link      { padding: 1rem 0.75rem;}
    .hospital-card, .doctor-card { margin-bottom: 1.5rem;}
    .table-responsive { font-size: 0.93rem;}
    .table td, .table th { padding: 0.75rem 0.5rem; vertical-align: middle; }
}

/* Swipe and loading indication (Monochrome) */
.swipeable::after {
    border-left: 6px solid #bcbcbc;
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
}

.page-loader,
.loading-overlay {
    background: #161616;
    color: #fff;
}
.loader-spinner, .loading-spinner {
    border: 4px solid #444;
    border-top: 4px solid #fff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}
.loader-content { color: #fff;}
.loader-text, .loader-subtext { color: #e0e0e0; }
.loader-progress     { background: #242424;}
.loader-progress-bar { background: #fff; }

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

@keyframes pulse {
    0%, 100% { opacity: 0.7;}
    50% { opacity: 1;}
}

@keyframes progress {
    0% { transform: scaleX(0);}
    100% { transform: scaleX(1);}
}

/* Modal, iOS & Android tweaks (unchanged except for color variables) */
/* ...Keep the rest as is for device optimization... */