:root {
    /* DEFAULT THEME: Teal/Blue-Green (Formerly Second Theme) */
    --primary-color: #26A69A;
    /* Teal/Turquoise */
    --secondary-color: #42A5F5;
    /* Light Blue */
    --accent-color: #E0F2F1;
    /* Very Light Teal Background */
    --text-color: #00695C;
    /* Dark Teal for text */
    --bg-color: #ffffff;
    --card-bg: rgba(255, 255, 255, 0.95);
    --glass-shadow: 0 8px 32px 0 rgba(38, 166, 154, 0.15);
    --transition-speed: 0.3s;
}

/* ALTERNATE THEME: Professional Blue (Replaces Green) */
body.blue-theme {
    --primary-color: #1976D2;
    /* Professional Blue */
    --secondary-color: #64B5F6;
    /* Soft Blue */
    --accent-color: #E3F2FD;
    /* Very Light Blue Background */
    --text-color: #0D47A1;
    /* Dark Blue for text */
    --glass-shadow: 0 8px 32px 0 rgba(25, 118, 210, 0.15);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

body {
    background-color: var(--accent-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Mobile-First Header */
header {
    background: var(--bg-color);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.nav-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.75rem 1rem;
    gap: 0.75rem;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-section img {
    height: 80px;
    width: auto;
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.15));
    transition: all var(--transition-speed);
}

.clinic-name h1 {
    font-size: 1.2rem;
    color: var(--text-color);
    font-weight: 700;
    line-height: 1.2;
    margin: 0;
}

.clinic-name span {
    color: var(--primary-color);
    font-size: 0.8rem;
    display: block;
    font-weight: 500;
    margin-top: 2px;
}

nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    font-size: 0.85rem;
    transition: var(--transition-speed);
}

nav a:hover,
nav a.active {
    color: var(--primary-color);
}

/* Theme Toggle Button */
.theme-toggle {
    background: var(--primary-color);
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-speed);
    font-size: 1.1rem;
}

.theme-toggle:hover {
    transform: scale(1.1) rotate(15deg);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    padding: 8px 16px;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    transition: var(--transition-speed);
    text-decoration: none;
    font-size: 0.85rem;
}

.btn-primary:hover {
    background-color: #0b3d80;
    transform: translateY(-2px);
}

/* Hero Section - Mobile First */
.hero {
    margin-top: 120px;
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    padding: 1.5rem;
}

.hero-content {
    max-width: 100%;
}

.hero h2 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.hero p {
    font-size: 1rem;
    margin-bottom: 1.5rem;
    color: #555;
}

/* Appointment Section - Mobile First */
.appointment-section {
    padding: 2rem 1rem;
    background: white;
}

.container {
    max-width: 100%;
    margin: 0 auto;
}

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

.appointment-form {
    background: white;
    padding: 1.5rem;
    border-radius: 20px;
    box-shadow: var(--glass-shadow);
    max-width: 100%;
    margin: 0 auto;
    border: 1px solid rgba(255, 255, 255, 0.18);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.9rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition-speed);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(13, 75, 159, 0.1);
}

/* Dashboard Section - Mobile First */
.dashboard-section {
    padding: 2rem 1rem;
    display: none;
}

/* Dashboard Stats - Mobile First */
.stats-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 15px;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: white;
    padding: 1.25rem;
    border-radius: 15px;
    box-shadow: var(--glass-shadow);
    display: flex;
    align-items: center;
    gap: 15px;
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
}

.stat-info h3 {
    font-size: 0.8rem;
    color: #666;
    margin-bottom: 5px;
}

.stat-info p {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* Controls - Mobile First */
.controls-container {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 15px;
    background: white;
    padding: 1rem;
    border-radius: 15px;
    box-shadow: var(--glass-shadow);
}

.search-box {
    position: relative;
    width: 100%;
}

.search-box input {
    width: 100%;
    padding: 10px 10px 10px 35px;
    border: 1px solid #ddd;
    border-radius: 50px;
    outline: none;
}

.search-box i {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: #888;
}

.filter-box {
    width: 100%;
}

.filter-box select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 50px;
    outline: none;
    cursor: pointer;
}

.controls-container .btn-primary {
    width: 100%;
}

/* Dashboard Grid - Mobile First */
.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 15px;
}

.dashboard-card {
    background: white;
    border-radius: 15px;
    padding: 1.25rem;
    box-shadow: var(--glass-shadow);
    margin-top: 0;
}

/* Patient Cards - Mobile First */
.patients-cards {
    display: block;
}

.patient-card {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 1rem;
    margin-bottom: 1rem;
    border-left: 4px solid var(--primary-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.patient-card.cancelled {
    opacity: 0.6;
    background: #f0f0f0;
    border-left-color: #999;
}

.patient-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid #ddd;
}

.patient-card-name {
    font-weight: 600;
    font-size: 1rem;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.patient-card-date {
    font-size: 0.75rem;
    color: #666;
}

.patient-card-body {
    display: grid;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.patient-card-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
}

.patient-card-label {
    color: #666;
    font-weight: 500;
}

.patient-card-value {
    color: var(--text-color);
    font-weight: 600;
}

.patient-card-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid #ddd;
}

.patient-card-actions select,
.patient-card-actions input {
    flex: 1;
    min-width: 120px;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 0.85rem;
}

.patient-card-actions button,
.patient-card-actions a {
    padding: 0.5rem 0.75rem !important;
    font-size: 0.8rem !important;
    border-radius: 6px;
}

/* Hide table on mobile, show cards */
.table-container {
    display: none;
}

.patients-cards {
    display: block;
}

.dashboard-card h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.chart-container {
    padding: 0.5rem;
    height: 250px;
}

/* Modal - Mobile First */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.5);
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: #fefefe;
    margin: 1rem;
    padding: 1.5rem;
    border: 1px solid #888;
    width: calc(100% - 2rem);
    max-width: 500px;
    border-radius: 15px;
    position: relative;
    animation: slideIn 0.3s;
}

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

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.close-modal {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    position: absolute;
    right: 15px;
    top: 5px;
}

.close-modal:hover,
.close-modal:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}

/* Footer */
footer {
    background: var(--primary-color);
    color: white;
    text-align: center;
    padding: 1.5rem;
    margin-top: auto;
    font-size: 0.85rem;
}

/* ========================================
   TABLET BREAKPOINT (min-width: 768px)
   ======================================== */
@media (min-width: 768px) {
    .nav-container {
        flex-direction: row;
        justify-content: space-between;
        padding: 1rem 3%;
    }

    .logo-section img {
        height: 90px;
    }

    .clinic-name h1 {
        font-size: 1.4rem;
    }

    .clinic-name span {
        font-size: 0.95rem;
    }

    nav ul {
        gap: 15px;
    }

    nav a {
        font-size: 0.9rem;
    }

    .hero {
        margin-top: 100px;
        min-height: 70vh;
        padding: 2rem;
    }

    .hero h2 {
        font-size: 2.25rem;
    }

    .hero p {
        font-size: 1.1rem;
    }

    .appointment-section {
        padding: 3rem 2rem;
    }

    .appointment-form {
        padding: 2rem;
        max-width: 600px;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .stats-container {
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
        margin-bottom: 2rem;
    }

    .stat-card {
        padding: 1.5rem;
    }

    .stat-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }

    .stat-info h3 {
        font-size: 0.9rem;
    }

    .stat-info p {
        font-size: 1.5rem;
    }

    .controls-container {
        flex-direction: row;
        align-items: center;
        gap: 15px;
        padding: 1rem;
    }

    .search-box {
        flex: 1;
        min-width: 200px;
    }

    .filter-box {
        width: auto;
    }

    .filter-box select {
        width: auto;
    }

    .controls-container .btn-primary {
        width: auto;
    }

    .dashboard-grid {
        grid-template-columns: 2fr 1fr;
        gap: 20px;
    }

    .dashboard-card {
        padding: 2rem;
    }

    .chart-container {
        padding: 1rem;
        height: 300px;
    }

    table {
        font-size: 0.9rem;
    }

    th,
    td {
        padding: 1rem;
    }

    th {
        font-size: 0.9rem;
    }

    td button,
    td a {
        font-size: 0.8rem !important;
        padding: 5px 10px !important;
    }

    /* Show table, hide cards on tablet+ */
    .table-container {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .patients-cards {
        display: none;
    }

    table {
        width: 100%;
        border-collapse: collapse;
        margin-top: 1rem;
    }

    th,
    td {
        text-align: left;
        border-bottom: 1px solid #eee;
    }

    tr:hover {
        background-color: #f8f9fa;
    }
}

/* ========================================
   DESKTOP BREAKPOINT (min-width: 1024px)
   ======================================== */
@media (min-width: 1024px) {
    .nav-container {
        padding: 1rem 5%;
        max-width: 1200px;
    }

    .logo-section img {
        height: 100px;
    }

    .clinic-name h1 {
        font-size: 1.6rem;
    }

    .clinic-name span {
        font-size: 1.1rem;
    }

    nav ul {
        gap: 20px;
    }

    nav a {
        font-size: 1rem;
    }

    .btn-primary {
        padding: 10px 20px;
        font-size: 1rem;
    }

    .hero {
        margin-top: 80px;
        min-height: 80vh;
    }

    .hero h2 {
        font-size: 3rem;
    }

    .hero p {
        font-size: 1.2rem;
    }

    .appointment-section {
        padding: 4rem 2rem;
    }

    .section-title {
        font-size: 2rem;
        margin-bottom: 3rem;
    }

    .container {
        max-width: 1000px;
    }

    table {
        font-size: 1rem;
    }

    th {
        font-size: 1rem;
    }

    td button,
    td a {
        font-size: 0.8rem !important;
        padding: 5px 10px !important;
    }
}

/* Print Styles */
@media print {

    header,
    .hero,
    .appointment-section,
    .stats-container,
    footer,
    .controls-container button,
    .dashboard-card:nth-child(2) {
        display: none !important;
    }

    body,
    #main-content,
    #dashboard,
    .dashboard-section {
        background: white;
        margin: 0;
        padding: 0;
        visibility: visible;
    }

    .dashboard-grid {
        display: block;
    }

    .dashboard-card {
        box-shadow: none;
        border: 1px solid #ddd;
    }

    #patientsTable th:last-child,
    #patientsTable td:last-child {
        display: none;
    }
}
/* --- PWA INSTALL BANNER --- */
.pwa-banner { position: fixed; bottom: 20px; left: 20px; right: 20px; z-index: 9000; max-width: 450px; margin: 0 auto; background: white; border: 1px solid rgba(0, 0, 0, 0.05); border-radius: 18px; box-shadow: 0 15px 50px rgba(0, 0, 0, 0.2); padding: 16px; display: none; align-items: center; gap: 14px; animation: pwaSlideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1); } @keyframes pwaSlideUp { from { transform: translateY(100px); opacity: 0; } to { transform: translateY(0); opacity: 1; } } .pwa-icon { width: 48px; height: 48px; background: var(--primary-color); border-radius: 12px; display: flex; align-items: center; justify-content: center; color: white; font-weight: bold; font-size: 1.25rem; flex-shrink: 0; box-shadow: 0 4px 10px rgba(38, 166, 154, 0.3); } .pwa-content { flex: 1; min-width: 0; } .pwa-title { font-weight: 700; color: var(--text-color); font-size: 0.95rem; margin-bottom: 2px; } .pwa-desc { font-size: 0.75rem; color: #666; line-height: 1.4; } .pwa-actions { display: flex; align-items: center; gap: 10px; } .pwa-install-btn { background: var(--primary-color); color: white; border: none; padding: 9px 18px; border-radius: 12px; font-size: 0.8rem; font-weight: 600; cursor: pointer; white-space: nowrap; transition: all 0.2s; box-shadow: 0 4px 12px rgba(38, 166, 154, 0.2); } .pwa-install-btn:hover { transform: translateY(-2px); } .pwa-install-btn:active { transform: translateY(0) scale(0.95); } .pwa-close-btn { width: 32px; height: 32px; border: none; background: #f5f5f5; border-radius: 50%; color: #888; cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: 0.9rem; transition: all 0.2s; } .pwa-close-btn:hover { background: #eee; color: #444; } @media (min-width: 768px) { .pwa-banner { right: 20px; left: auto; } }