/* Custom Style Sheet - Premium Dark-Slate Design */

:root {
    --bg-primary: #0f172a;
    --bg-secondary: #0b0f19;
    --bg-card: #1e293b;
    --bg-card-hover: #243249;
    --accent-primary: #6366f1; /* Indigo */
    --accent-primary-glow: rgba(99, 102, 241, 0.15);
    --accent-secondary: #06b6d4; /* Cyan */
    --accent-success: #10b981; /* Emerald */
    --accent-warning: #f59e0b; /* Amber */
    --accent-danger: #ef4444; /* Rose */
    
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    
    --border-color: rgba(255, 255, 255, 0.06);
    --border-focus: rgba(99, 102, 241, 0.5);
    --glass-bg: rgba(30, 41, 59, 0.55);
    --glass-border: rgba(255, 255, 255, 0.08);
    
    --shadow-main: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.25);
    --shadow-glow-teal: 0 0 20px rgba(20, 184, 166, 0.25);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    background-image: 
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.08) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(6, 182, 212, 0.08) 0px, transparent 50%);
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-sm);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* App Container Layout */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding: 20px;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
}

.content-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 10px 0;
}

/* Header & Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

/* Glassmorphism Cards */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 30px;
    width: 100%;
    max-width: 480px;
    box-shadow: var(--shadow-main);
    transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.glass-card:hover {
    border-color: rgba(99, 102, 241, 0.25);
}

/* Card Header */
.card-header {
    text-align: center;
    margin-bottom: 25px;
}

.logo-icon {
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 12px;
    display: inline-block;
    filter: drop-shadow(0 2px 10px rgba(99, 102, 241, 0.3));
}

.card-title {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 6px;
    background: linear-gradient(to right, #ffffff, #e2e8f0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.card-subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* Form Styles */
.form-group {
    margin-bottom: 20px;
    position: relative;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.input-container {
    position: relative;
}

.input-container i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 1rem;
    transition: color var(--transition-fast);
}

.form-input {
    width: 100%;
    padding: 14px 16px 14px 45px;
    background-color: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

.form-input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 12px rgba(99, 102, 241, 0.2);
    background-color: rgba(15, 23, 42, 0.8);
}

.form-input:focus + i {
    color: var(--accent-primary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 14px 20px;
    background: linear-gradient(135deg, var(--accent-primary) 0%, #4f46e5 100%);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.1s ease, box-shadow var(--transition-fast), opacity var(--transition-fast);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.45), var(--shadow-glow);
}

.btn:active {
    transform: translateY(1px);
}

.btn:disabled {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    box-shadow: none;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.03);
    border-color: var(--text-muted);
    box-shadow: none;
}

.btn-danger {
    background: linear-gradient(135deg, var(--accent-danger) 0%, #dc2626 100%);
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.45);
}

.btn-success {
    background: linear-gradient(135deg, var(--accent-success) 0%, #059669 100%);
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.btn-success:hover {
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.45);
}

/* Alert States */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 12px;
    border: 1px solid transparent;
}

.alert-info {
    background: rgba(6, 182, 212, 0.1);
    color: var(--accent-secondary);
    border-color: rgba(6, 182, 212, 0.2);
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-success);
    border-color: rgba(16, 185, 129, 0.2);
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--accent-warning);
    border-color: rgba(245, 158, 11, 0.2);
}

.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--accent-danger);
    border-color: rgba(239, 68, 68, 0.2);
}

/* Footer style */
.app-footer {
    text-align: center;
    padding: 20px 0;
    color: var(--text-muted);
    font-size: 0.8rem;
    border-top: 1px solid var(--border-color);
    margin-top: 40px;
    width: 100%;
}

.status-indicator-dot {
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    margin-left: 5px;
}

.status-indicator-dot.online {
    background-color: var(--accent-success);
    box-shadow: 0 0 8px var(--accent-success);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.9); opacity: 0.6; }
    50% { transform: scale(1.2); opacity: 1; }
    100% { transform: scale(0.9); opacity: 0.6; }
}

/* ==========================================================================
   DYNAMIC QR CODE DISPLAY PAGE
   ========================================================================== */
.qr-display-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    max-width: 650px;
    width: 100%;
}

.qr-glow-wrapper {
    background: rgba(30, 41, 59, 0.4);
    border: 1px solid var(--glass-border);
    padding: 25px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-main), 0 0 50px rgba(99, 102, 241, 0.1);
    margin-bottom: 30px;
    position: relative;
    overflow: hidden;
}

.qr-glow-wrapper::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
    pointer-events: none;
}

.qr-box {
    background-color: white;
    padding: 20px;
    border-radius: var(--radius-md);
    display: inline-block;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
    transition: transform var(--transition-normal);
}

.qr-box:hover {
    transform: scale(1.02);
}

.qr-box img {
    display: block;
    width: 280px;
    height: 280px;
}

.digital-clock {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 10px;
    background: linear-gradient(135deg, #ffffff 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.03em;
}

.qr-instructions {
    margin-top: 15px;
    color: var(--text-secondary);
}

.timer-bar-container {
    width: 100%;
    height: 6px;
    background-color: var(--bg-primary);
    border-radius: 3px;
    margin: 25px 0 10px 0;
    overflow: hidden;
}

.timer-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    width: 100%;
    border-radius: 3px;
    transition: width 1s linear;
}

.timer-text {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
}

/* ==========================================================================
   ADMIN PORTAL LAYOUT
   ========================================================================== */
.admin-layout {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 30px;
    width: 100%;
    min-height: 80vh;
}

/* Admin Sidebar */
.admin-sidebar {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 25px 15px;
    display: flex;
    flex-direction: column;
    height: fit-content;
}

.admin-profile {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
}

.admin-avatar {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: white;
}

.admin-details h4 {
    font-size: 0.95rem;
    margin-bottom: 2px;
}

.admin-details span {
    font-size: 0.75rem;
    color: var(--accent-secondary);
    font-weight: 600;
}

.sidebar-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.menu-item button {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 12px 16px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 500;
    text-align: left;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.menu-item button:hover {
    background-color: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
}

.menu-item.active button {
    background-color: var(--accent-primary-glow);
    color: var(--accent-primary);
    border-left: 3px solid var(--accent-primary);
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}

/* Admin Dashboard Main Content */
.admin-main {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.dashboard-title h2 {
    font-size: 2rem;
    font-weight: 800;
}

.dashboard-title p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-top: 3px;
}

/* Metrics Summary Grid */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    width: 100%;
}

.metric-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 20px;
    box-shadow: var(--shadow-main);
    transition: border-color var(--transition-fast);
}

.metric-card:hover {
    border-color: rgba(255, 255, 255, 0.12);
}

.metric-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.metric-icon.present { background: rgba(16, 185, 129, 0.1); color: var(--accent-success); }
.metric-icon.late { background: rgba(245, 158, 11, 0.1); color: var(--accent-warning); }
.metric-icon.absent { background: rgba(239, 68, 68, 0.1); color: var(--accent-danger); }
.metric-icon.leave { background: rgba(6, 182, 212, 0.1); color: var(--accent-secondary); }

.metric-info h5 {
    font-size: 0.8rem;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    margin-bottom: 5px;
}

.metric-value {
    font-size: 1.8rem;
    font-weight: 800;
    line-height: 1;
}

/* Tabs Panel Content */
.tab-content {
    display: none;
    width: 100%;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

/* Panel Containers */
.panel-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 25px;
    box-shadow: var(--shadow-main);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.panel-title {
    font-size: 1.3rem;
    font-weight: 700;
}

/* Custom Table Styles */
.table-responsive {
    overflow-x: auto;
    width: 100%;
}

.custom-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.custom-table th {
    padding: 14px 18px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.custom-table td {
    padding: 16px 18px;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.custom-table tbody tr:hover td {
    background-color: rgba(255, 255, 255, 0.02);
    color: var(--text-primary);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.badge-present { background: rgba(16, 185, 129, 0.12); color: var(--accent-success); }
.badge-late { background: rgba(245, 158, 11, 0.12); color: var(--accent-warning); }
.badge-absent { background: rgba(239, 68, 68, 0.12); color: var(--accent-danger); }
.badge-leave { background: rgba(6, 182, 212, 0.12); color: var(--accent-secondary); }

.badge-pending { background: rgba(245, 158, 11, 0.12); color: var(--accent-warning); }
.badge-approved { background: rgba(16, 185, 129, 0.12); color: var(--accent-success); }
.badge-rejected { background: rgba(239, 68, 68, 0.12); color: var(--accent-danger); }

/* Flagged status indicator */
.badge-flagged {
    background: rgba(239, 68, 68, 0.15);
    color: var(--accent-danger);
    border: 1px dashed var(--accent-danger);
}

/* Inline actions */
.table-actions {
    display: flex;
    gap: 8px;
}

.btn-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.btn-icon.approve:hover {
    background: rgba(16, 185, 129, 0.15);
    color: var(--accent-success);
    border-color: var(--accent-success);
}

.btn-icon.reject:hover {
    background: rgba(239, 68, 68, 0.15);
    color: var(--accent-danger);
    border-color: var(--accent-danger);
}

/* Settings Forms Grid */
.settings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 25px;
}

@media (max-width: 900px) {
    .settings-grid {
        grid-template-columns: 1fr;
    }
}

.actions-bar {
    display: flex;
    gap: 12px;
}

/* Modal Popup (for Leave or Teacher Edit) */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(15, 23, 42, 0.75);
    backdrop-filter: blur(8px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    width: 100%;
    max-width: 480px;
    padding: 30px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
    position: relative;
    animation: modalSlideIn 0.3s ease;
}

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

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.2rem;
    cursor: pointer;
    transition: color var(--transition-fast);
}

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

/* Geolocation Loading State UI */
.geo-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 15px 0;
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top: 3px solid var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 10px;
}

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

.geo-details-pill {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
}

/* Responsive Overrides */
@media (max-width: 768px) {
    .admin-layout {
        grid-template-columns: 1fr;
    }
    .app-container {
        padding: 10px;
    }
}