:root {
    /* Light Theme (Default) */
    --bg-main: #f4f7fe;
    --bg-card: #ffffff;
    --bg-sidebar: #ffffff;
    --text-primary: #000000;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --primary: #4318FF;
    --primary-hover: #3211c4;
    --secondary: #05CD99;
    --danger: #EE5D50;
    --warning: #FFCE20;
    --total-count-color: #3b82f6;
    --card-shadow: 0px 18px 40px rgba(112, 144, 176, 0.12);
    --transition: all 0.3s ease;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
}

[data-theme="dark"] {
    --bg-main: #0b1437;
    --bg-card: #111c44;
    --bg-sidebar: #111c44;
    --text-primary: #ffffff;
    --text-secondary: #a3aed1;
    --border-color: #2b3674;
    --total-count-color: #60a5fa;
    --card-shadow: 0px 18px 40px rgba(0, 0, 0, 0.2);
    --glass-bg: rgba(17, 28, 68, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    transition: var(--transition);
    overflow-x: hidden;
    font-size: 16px;
}

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

/* Sidebar */
.sidebar {
    width: 280px;
    min-width: 280px;
    background-color: var(--bg-sidebar);
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    z-index: 100;
}

/* Finance Sub-navigation Tabs */
.finance-sub-nav {
    display: flex;
    gap: 10px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
    overflow-x: auto;
}

.finance-sub-nav .tab-btn {
    padding: 12px 24px;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    font-weight: 700;
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    letter-spacing: 0.3px;
}

.finance-sub-nav .tab-btn:hover {
    color: var(--primary);
}

.finance-sub-nav .tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.logo-container {
    padding: 30px;
    display: flex;
    align-items: center;
    gap: 15px;
    border-bottom: 1px solid var(--border-color);
}

.logo-container i {
    font-size: 28px;
    color: var(--primary);
}

.logo-container h2 {
    font-size: 20px;
    font-weight: 700;
    line-height: 1.2;
}

.logo-container h2 span {
    font-weight: 400;
    color: var(--text-secondary);
}

.nav-menu {
    padding: 20px 0;
    flex: 1;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 15px 30px;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    border-right: 3px solid transparent;
}

.nav-item i {
    width: 24px;
    margin-right: 15px;
    font-size: 18px;
}

.nav-item:hover, .nav-item.active {
    color: var(--primary);
    background-color: rgba(67, 24, 255, 0.05);
}

.nav-item.active {
    border-right-color: var(--primary);
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-info .avatar {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), #868CFF);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
}

.user-info .name {
    font-weight: 600;
    font-size: 14px;
}

.user-info .role {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-width: 0;
}

.top-header {
    min-height: 80px;
    padding: 16px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
    z-index: 10;
}

.search-bar {
    display: flex;
    align-items: center;
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0 16px;
    width: min(380px, 100%);
    min-width: 220px;
    height: 42px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.03);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.search-bar:focus-within {
    width: 440px;
    border-color: var(--primary);
    background-color: var(--bg-card);
    box-shadow: 0 4px 20px rgba(67, 24, 255, 0.1);
}

.search-bar i {
    color: var(--primary);
    margin-right: 12px;
    font-size: 15px;
}

.search-bar input {
    border: none;
    background: transparent;
    outline: none;
    color: var(--text-primary);
    width: 100%;
    font-size: 14px;
    font-weight: 500;
}

.header-actions {
    display: flex;
    gap: 15px;
}

.icon-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background-color: var(--bg-card);
    color: var(--text-primary);
    cursor: pointer;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.content-wrapper {
    flex: 1;
    padding: 24px 24px 32px;
    overflow-y: auto;
}

.module {
    display: none;
    animation: fadeIn 0.4s ease-out forwards;
}

.module.active {
    display: block;
}

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

.header-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.header-flex h1 {
    font-size: 24px;
    font-weight: 700;
}

.date-display {
    color: var(--text-secondary);
    font-weight: 500;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 18px;
    margin-bottom: 24px;
}

.stat-card {
    background-color: var(--bg-card);
    border-radius: 20px;
    padding: 25px;
    display: flex;
    align-items: center;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

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

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-right: 20px;
}

.stat-icon.purple { background-color: rgba(67, 24, 255, 0.1); color: #4318FF; }
.stat-icon.blue { background-color: rgba(59, 130, 246, 0.1); color: #3b82f6; }
.stat-icon.green { background-color: rgba(5, 205, 153, 0.1); color: #05CD99; }
.stat-icon.orange { background-color: rgba(245, 158, 11, 0.1); color: #f59e0b; }
.stat-icon.red { background-color: rgba(238, 93, 80, 0.1); color: #EE5D50; }

.stat-details p {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 5px;
}

.stat-details h3 {
    font-size: 24px;
    font-weight: 700;
}

/* Modern Tooltip Styling */
.tooltip-container {
    position: relative;
}

.tooltip-box {
    visibility: hidden;
    background-color: #1e293b;
    color: #fff;
    text-align: left;
    padding: 12px 16px;
    border-radius: 12px;
    position: absolute;
    z-index: 1000;
    bottom: 110%;
    left: 50%;
    transform: translateX(-50%);
    width: 260px;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 12px;
    line-height: 1.5;
    box-shadow: 0 10px 25px rgba(0,0,0,0.3);
    pointer-events: none;
    border: 1px solid rgba(255,255,255,0.1);
}

.tooltip-container:hover .tooltip-box {
    visibility: visible;
    opacity: 1;
    bottom: 120%;
}

/* Loading Spinner */
.loader-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-main);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 3000;
    transition: opacity 0.5s ease, visibility 0.5s;
}

.loader-overlay.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader {
    width: 50px;
    height: 50px;
    border: 5px solid var(--border-color);
    border-top: 5px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: 30px;
    right: 30px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
    pointer-events: none;
}

.toast {
    background: var(--secondary);
    color: white;
    padding: 14px 24px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    font-weight: 600;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 12px;
    pointer-events: auto;
    animation: toast-slide-in 0.3s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.toast.error { background: var(--danger); }
.toast.info { background: var(--primary); }

.status-banner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 10001;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px 20px;
    font-weight: 700;
    font-size: 14px;
    color: #fff;
    pointer-events: none;
}

.status-banner.connected {
    background: #28a745;
}

.status-banner.disconnected {
    background: #d32f2f;
}

.status-banner.hidden {
    display: none;
}

@keyframes toast-slide-in {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.toast.fade-out {
    animation: toast-fade-out 0.4s ease-out forwards;
}

@keyframes toast-fade-out {
    from { opacity: 1; transform: translateX(0); }
    to { opacity: 0; transform: translateX(20px); }
}

/* Force uppercase for name and location fields */
.uppercase-input {
    text-transform: uppercase;
}

h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

/* Charts Container */
.charts-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 20px;
}

.chart-card {
    background-color: var(--bg-card);
    border-radius: 20px;
    padding: 25px;
    box-shadow: var(--card-shadow);
}

.chart-card h3 {
    margin-bottom: 20px;
    font-size: 18px;
}

/* Cards & Tables */
.card {
    background-color: var(--bg-card);
    border-radius: 20px;
    padding: 20px;
    box-shadow: var(--card-shadow);
}

.table-card {
    overflow-x: auto;
}

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

.data-table th {
    text-align: left;
    padding: 15px;
    color: var(--text-primary);
    font-weight: 700;
    border-bottom: 1px solid var(--border-color);
}

.data-table td {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
}

.data-table tbody tr {
    transition: var(--transition);
}

.data-table tbody tr:hover {
    background-color: rgba(0,0,0,0.02);
}

[data-theme="dark"] .data-table tbody tr:hover {
    background-color: rgba(255,255,255,0.02);
}

.badge {
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}
.badge-success { background: rgba(5, 205, 153, 0.1); color: #05CD99; }
.badge-danger { background: rgba(238, 93, 80, 0.1); color: #EE5D50; }

.grid-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 18px;
}

/* Buttons & Forms */
.btn {
    padding: 10px 20px;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-size: 14px;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(67, 24, 255, 0.3);
}

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

.btn-success:hover { background-color: #04b386; transform: translateY(-2px); }

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

.btn-outline:hover {
    background: var(--border-color);
}

.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-icon { width: 32px; height: 32px; padding: 0; display: inline-flex; align-items: center; justify-content: center; }

.form-group {
    margin-bottom: 20px;
    flex: 1;
}

.form-row {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 14px;
}

input, select {
    width: 100%;
    padding: 12px 15px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-main);
    color: var(--text-primary);
    outline: none;
    transition: var(--transition);
}

input:focus, select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(67, 24, 255, 0.1);
}

.mt-20 { margin-top: 20px; }
.mb-10 { margin-bottom: 10px; }
.text-right { text-align: right; }

@media (max-width: 1024px) {
    .app-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        min-width: 100%;
        max-height: 60vh;
        overflow-y: auto;
    }

    .top-header {
        padding: 16px 20px;
    }

    .content-wrapper {
        padding: 20px;
    }

    .charts-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .top-header {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }

    .header-actions {
        justify-content: flex-end;
    }

    .search-bar {
        width: 100%;
        min-width: 0;
    }

    .header-flex {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .form-row {
        flex-direction: column;
        gap: 0;
    }

    .modal {
        width: 96vw;
        max-height: 95vh;
        border-radius: 16px;
    }

    .modal-body {
        padding: 18px;
    }

    .form-actions {
        flex-direction: column-reverse;
    }

    .btn,
    .btn-brand {
        width: 100%;
    }

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

    .table-card {
        padding: 0;
    }

    .data-table th,
    .data-table td {
        padding: 12px 10px;
        font-size: 14px;
    }
}

@media (max-width: 560px) {
    body {
        font-size: 14px;
    }

    .content-wrapper {
        padding: 14px;
    }

    .card,
    .stat-card,
    .chart-card {
        padding: 16px;
        border-radius: 16px;
    }

    .logo-container {
        padding: 20px;
    }

    .nav-item {
        padding: 13px 20px;
    }

    .toast-container {
        left: 12px;
        right: 12px;
        top: 12px;
    }

    .toast {
        width: 100%;
        justify-content: space-between;
    }
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(5px);
    z-index: 4000; /* Increased to be above everything, including signin overlay */
    display: none;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    display: flex;
    opacity: 1;
}

.modal {
    background-color: var(--bg-card);
    width: min(94vw, 860px);
    max-width: 860px;
    max-height: 92vh;
    border-radius: 24px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.2);
    transform: translateY(20px);
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
}

.modal-overlay.active .modal {
    transform: translateY(0);
}

.modal-header {
    padding: 20px 25px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 { font-size: 18px; }

.modal-body {
    padding: 25px;
    max-height: 80vh;
    overflow-y: auto;
}

.form-section {
    margin-bottom: 20px;
    padding: 18px;
    border-radius: 16px;
    background: rgba(0, 0, 0, 0.015);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

[data-theme="dark"] .form-section {
    background: rgba(255, 255, 255, 0.02);
}

.form-section:hover {
    border-color: #00AEEF;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.section-title {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    text-transform: uppercase;
    color: #D2122E;
    margin-bottom: 20px;
    letter-spacing: 1.5px;
    font-weight: 700;
}

.section-title i {
    background: rgba(210, 18, 46, 0.1);
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    font-size: 18px;
}

.professional-checkbox {
    background: var(--bg-main);
    padding: 15px 25px;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    transition: var(--transition);
    width: fit-content;
    cursor: pointer;
}

.professional-checkbox:hover {
    border-color: #05CD99;
    background: rgba(5, 205, 153, 0.05);
}

.checkbox-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-left: 10px;
}

.btn-brand {
    background-color: #00AEEF !important;
    padding: 14px 40px !important;
    font-size: 16px !important;
    border-radius: 12px !important;
    font-weight: 700 !important;
}

.btn-brand:hover {
    box-shadow: 0 12px 25px rgba(0, 174, 239, 0.4) !important;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 0;
}

.checkbox-container {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 15px;
}

.student-name-link {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
    cursor: pointer;
}

.student-name-link:hover {
    color: #00AEEF;
}

.teacher-card, .staff-card, .course-card {
    background-color: var(--bg-card);
    border-radius: 20px;
    padding: 25px;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    border: 1px solid var(--border-color);
}

.teacher-card, .staff-card, .course-card {
    border-color: var(--warning);
    border-width: 2px;
}

.teacher-card:hover, .staff-card:hover, .course-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
}

.teacher-card-header, .staff-card-header, .course-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.teacher-card-header strong, .staff-card-header strong, .course-card-header strong {
    font-size: 18px;
    font-weight: 700;
}

.teacher-card-body p, .staff-card-body p, .course-card-body p {
    font-size: 14px;
    color: var(--text-primary);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.teacher-card-body p i, .staff-card-body p i, .course-card-body p i {
    color: var(--primary);
}

.teacher-card-body .badge, .staff-card-body .badge {
    margin-top: 10px;
    display: inline-block;
}

.teacher-name-link.name-suspended strong, .staff-name-link.name-suspended strong {
    text-decoration: line-through;
    color: var(--danger);
}

.student-name-link.name-suspended {
    opacity: 0.7;
}

.student-name-link.name-suspended strong {
    text-decoration: line-through;
    color: var(--danger);
}

.teacher-name-link, .staff-name-link {
    text-decoration: none;
    color: inherit;
}

.details-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 25px;
}

.details-section h4 {
    color: #D2122E;
    margin-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 6px;
    font-size: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.details-section p {
    margin-bottom: 8px;
    font-size: 14px;
}

.action-icons {
    display: flex;
    gap: 10px;
    align-items: center;
}

/* Certificate Styles */
.certificate-preview-container {
    background: var(--bg-card);
    padding: 20px;
    border-radius: 20px;
    box-shadow: var(--card-shadow);
    overflow-x: auto;
}

.certificate {
    width: 800px; /* Fixed width for standard A4 Landscape feel in preview */
    height: 565px;
    background: white;
    margin: 0 auto;
    color: #333;
    padding: 20px;
    position: relative;
}

.cert-border {
    border: 10px solid #111c44;
    height: 100%;
    padding: 5px;
}

.cert-inner {
    border: 2px solid #d4af37; /* Gold */
    height: 100%;
    padding: 40px;
    text-align: center;
    position: relative;
    background-image: radial-gradient(circle, #fff 40%, #fefcf0 100%);
}

.cert-header { margin-bottom: 30px; }
.cert-logo { font-size: 40px; color: #d4af37; margin-bottom: 10px; }
.cert-header h2 { font-family: 'Times New Roman', serif; text-transform: uppercase; letter-spacing: 2px; font-size: 20px; }

.cert-title {
    font-family: 'Times New Roman', serif;
    font-size: 42px;
    color: #111c44;
    margin-bottom: 20px;
    text-transform: uppercase;
}

.cert-text {
    font-style: italic;
    font-size: 18px;
    margin-bottom: 15px;
    color: #555;
}

.cert-name {
    font-family: 'Great Vibes', cursive, 'Times New Roman', serif; /* Fallback cursive */
    font-size: 36px;
    color: #d4af37;
    margin-bottom: 20px;
    border-bottom: 1px solid #ccc;
    display: inline-block;
    padding: 0 40px 5px;
}

.cert-course {
    font-family: 'Times New Roman', serif;
    font-size: 24px;
    color: #111c44;
    margin-bottom: 30px;
}

.cert-date {
    font-size: 16px;
    margin-bottom: 40px;
}

.cert-signatures {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-top: 40px;
}

.sig-line {
    width: 200px;
}

.sig-line .line {
    border-bottom: 1px solid #333;
    margin-bottom: 10px;
}

.sig-badge {
    font-size: 60px;
    color: #d4af37;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar { width: 80px; }
    .logo-container h2, .nav-item span { display: none; }
    .logo-container { padding: 20px; justify-content: center; }
    .nav-item { padding: 15px; justify-content: center; }
    .nav-item i { margin-right: 0; font-size: 24px; }
    .user-info .name, .user-info .role { display: none; }
    .charts-container { grid-template-columns: 1fr; }
    .certificate { width: 100%; height: auto; padding: 10px; }
    .cert-title { font-size: 28px; }
    .cert-name { font-size: 24px; }
    .cert-course { font-size: 18px; }
    .cert-signatures { flex-direction: column; align-items: center; gap: 20px; }
    .details-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

/* Sign-in Overlay - Modern Design */
body.auth-locked {
    overflow: hidden;
}

body.auth-locked .app-container {
    display: none;
}

body:not(.auth-locked) #signin-overlay {
    display: none !important;
}

/* Animated gradient blobs */
@keyframes blob-animation {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -50px) scale(1.1); }
    66% { transform: translate(-20px, 20px) scale(0.9); }
}

.signin-background {
    position: fixed;
    inset: 0;
    background: #ffffff;
    z-index: 1;
    overflow: hidden;
}

.signin-background::before {
    content: '';
    position: absolute;
    inset: -10%;
    background: none;
    z-index: 1;
}

.gradient-blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.45;
    animation: blob-animation 8s infinite;
}

.blob-1 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, #ef4444 0%, #2563eb 100%);
    top: -50px;
    right: 10%;
    animation-delay: 0s;
}

.blob-2 {
    width: 250px;
    height: 250px;
    background: linear-gradient(135deg, #f59e0b 0%, #ffffff 100%);
    bottom: 10%;
    left: 5%;
    animation-delay: 2s;
}

.blob-3 {
    width: 220px;
    height: 220px;
    background: linear-gradient(135deg, #2563eb 0%, #ef4444 100%);
    top: 50%;
    left: 50%;
    animation-delay: 4s;
}

.signin-overlay {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 40px 20px;
    z-index: 3001; /* Ensure sign-in is above loader */
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

.signin-container {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 520px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.signin-box {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 24px;
    padding: 48px 40px;
    width: 100%;
    max-width: 420px;
    max-height: calc(100vh - 80px);
    overflow-y: auto;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.3),
                0 0 40px rgba(67, 24, 255, 0.1);
    animation: signin-slide-up 0.6s ease-out;
}

@keyframes signin-slide-up {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.signin-header {
    text-align: center;
    margin-bottom: 32px;
}

.signin-logo-modern {
    width: auto;
    max-width: 320px;
    margin: 0 auto 20px;
    padding: 16px;
    background: rgba(255, 255, 255, 0.96);
    border-radius: 28px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    box-shadow: 0 18px 40px rgba(15, 23, 42, 0.12);
    animation: logo-float 3s ease-in-out infinite;
}

.signin-logo-modern::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 28px;
    background: linear-gradient(180deg, rgba(255,255,255,0.18), rgba(255,255,255,0));
}

.signin-logo-image {
    width: 100%;
    height: auto;
    display: block;
    position: relative;
    z-index: 1;
}

@keyframes logo-float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.signin-title {
    font-size: 28px;
    font-weight: 700;
    color: #D2122E;
    margin: 0 0 8px;
    letter-spacing: -0.5px;
}

.signin-subtitle {
    font-size: 14px;
    color: #FFB800;
    margin: 0;
    font-weight: 500;
}

.signin-form {
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 24px;
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 10px;
    letter-spacing: 0.3px;
}

.form-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.form-input-wrapper > i {
    position: absolute;
    left: 16px;
    color: #00AEEF;
    font-size: 16px;
    pointer-events: none;
}

.password-toggle {
    position: absolute;
    right: 16px;
    background: none;
    border: none;
    cursor: pointer;
    color: #94a3b8;
    display: flex;
    align-items: center;
    transition: color 0.3s ease;
}

.password-toggle:hover {
    color: #00AEEF;
}

.form-input {
    width: 100%;
    padding: 14px 44px;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    font-size: 14px;
    font-family: 'Inter', sans-serif;
    color: #1e293b;
    background-color: #f8fafc;
    transition: all 0.3s ease;
    outline: none;
}

.form-input::placeholder {
    color: #94a3b8;
}

.form-input:focus {
    background-color: #ffffff;
    border-color: #4318FF;
    box-shadow: 0 0 0 3px rgba(67, 24, 255, 0.1);
}

.signin-button {
    width: 100%;
    padding: 14px 24px;
    background: #00AEEF;
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    box-shadow: 0 10px 25px rgba(17, 24, 39, 0.2);
    font-family: 'Inter', sans-serif;
}

.signin-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(0, 174, 239, 0.4);
}

.signin-button:active {
    transform: translateY(0);
}

.signin-button i {
    font-size: 14px;
    transition: transform 0.3s ease;
}

.signin-button:hover i {
    transform: translateX(4px);
}

.signin-footer {
    text-align: center;
    font-size: 12px;
    color: #94a3b8;
    margin: 0;
    font-weight: 500;
}

@media (max-width: 480px) {
    .signin-box {
        padding: 32px 24px;
        border-radius: 20px;
    }
    .signin-title {
        font-size: 24px;
    }
    .signin-logo-modern {
        width: 70px;
        height: 70px;
        font-size: 36px;
    }
    .signin-form {
        margin-bottom: 16px;
    }
    .form-group {
        margin-bottom: 18px;
    }
}