/* ========================================
   MELT Timesheet App - Main Styles
   Modern Card-Based Design System
   ======================================== */

/* CSS Variables - Design Tokens */
:root {
    /* Primary Colors */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-200: #bfdbfe;
    --primary-300: #93c5fd;
    --primary-400: #60a5fa;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-800: #1e40af;
    --primary-900: #1e3a8a;

    /* Neutral Colors */
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;

    /* Accent Colors */
    --success-50: #f0fdf4;
    --success-100: #dcfce7;
    --success-500: #22c55e;
    --success-600: #16a34a;
    --success-700: #15803d;

    --warning-50: #fffbeb;
    --warning-100: #fef3c7;
    --warning-500: #f59e0b;
    --warning-600: #d97706;

    --danger-50: #fef2f2;
    --danger-100: #fee2e2;
    --danger-500: #ef4444;
    --danger-600: #dc2626;

    --info-50: #f0f9ff;
    --info-100: #e0f2fe;
    --info-500: #0ea5e9;
    --info-600: #0284c7;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    /* Sidebar */
    --sidebar-width: 280px;
    --sidebar-bg: linear-gradient(180deg, #1e3a8a 0%, #1e40af 50%, #2563eb 100%);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* Font Family */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    /* Neon Accent */
    --neon-glow: 0 0 12px rgba(59, 130, 246, 0.5), 0 0 30px rgba(59, 130, 246, 0.2);
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(255, 255, 255, 0.4);
    --scrollbar-thumb: linear-gradient(180deg, #3b82f6, #1d4ed8);
    --scrollbar-track: #e2e8f0;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: 0.9375rem;
    line-height: 1.5;
    color: var(--gray-800);
    background-color: var(--gray-100);
    overflow: hidden;
}

/* App Container */
.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
    overflow: hidden;
}

/* ========================================
   SIDEBAR
   ======================================== */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    height: 100vh;
    background: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    color: white;
    position: relative;
    z-index: 100;
}

.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
}

.logo-icon svg {
    width: 28px;
    height: 28px;
    color: white;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-size: 1.125rem;
    font-weight: 700;
    letter-spacing: -0.025em;
}

.logo-subtitle {
    font-size: 0.75rem;
    opacity: 0.7;
    font-weight: 400;
}

/* Navigation */
.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md) 0;
}

.nav-list {
    list-style: none;
}

.nav-item {
    margin: 2px 0;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: 0;
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: white;
    background: rgba(255, 255, 255, 0.1);
}

.nav-link.active {
    color: white;
    background: rgba(255, 255, 255, 0.15);
}

.nav-link.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: white;
    border-radius: 0 4px 4px 0;
}

.nav-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.nav-badge {
    margin-left: auto;
    font-size: 0.75rem;
    background: rgba(255, 255, 255, 0.2);
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-weight: 600;
}

.nav-divider {
    padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-sm);
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: rgba(255, 255, 255, 0.4);
    font-weight: 600;
}

/* Sidebar Footer */
.sidebar-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(0, 0, 0, 0.1);
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-avatar {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
}

.user-avatar svg {
    width: 22px;
    height: 22px;
}

.user-details {
    display: flex;
    flex-direction: column;
}

.user-name {
    font-weight: 600;
    font-size: 0.9375rem;
}

.user-role {
    font-size: 0.75rem;
    opacity: 0.7;
}

/* ========================================
   MAIN CONTENT AREA
   ======================================== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--gray-100);
}

/* Top Header */
.top-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg) var(--spacing-xl);
    background: white;
    border-bottom: 1px solid var(--gray-200);
    min-height: 80px;
    gap: var(--spacing-md);
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* Hamburger button — hidden on desktop */
.hamburger-btn {
    display: none;
    background: none;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    padding: 6px;
    cursor: pointer;
    color: var(--gray-700);
    transition: all var(--transition-fast);
}

.hamburger-btn:hover {
    background: var(--gray-100);
}

.page-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    letter-spacing: -0.025em;
}

.page-subtitle {
    font-size: 0.875rem;
    color: var(--gray-500);
}

/* Live Clock */
.header-center {
    text-align: center;
}

.live-clock {
    background: linear-gradient(135deg, var(--primary-900), var(--primary-700));
    color: white;
    padding: 8px 20px;
    border-radius: var(--radius-lg);
    box-shadow: var(--neon-glow);
    min-width: 180px;
}

.clock-time {
    font-size: 1.15rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.05em;
}

.clock-date {
    font-size: 0.7rem;
    opacity: 0.85;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.student-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.student-selector label {
    font-size: 0.875rem;
    color: var(--gray-600);
    font-weight: 500;
}

.student-dropdown {
    min-width: 220px;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    background: white;
    color: var(--gray-800);
    cursor: pointer;
    transition: border-color var(--transition-fast);
}

.student-dropdown:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px var(--primary-100);
}

/* Content Container */
.content-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-xl);
}

/* Views */
.view {
    display: none;
}

.view.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

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

/* ========================================
   BUTTONS
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-700) 100%);
    color: white;
    box-shadow: var(--shadow-sm), 0 1px 2px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-700) 0%, var(--primary-800) 100%);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md), 0 2px 4px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
    background: white;
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

.btn-secondary:hover {
    background: var(--gray-50);
    border-color: var(--gray-400);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-500) 0%, var(--success-600) 100%);
    color: white;
}

.btn-success:hover {
    background: linear-gradient(135deg, var(--success-600) 0%, var(--success-700) 100%);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger-500) 0%, var(--danger-600) 100%);
    color: white;
}

.btn-danger:hover {
    background: linear-gradient(135deg, var(--danger-600) 0%, #b91c1c 100%);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.35);
}

.btn-success:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(34, 197, 94, 0.35);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8125rem;
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

/* ========================================
   MODALS
   ======================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing-xl);
}

.modal-overlay.active {
    display: flex;
    animation: fadeIn 0.2s ease;
}

.modal {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 560px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg) var(--spacing-xl);
    border-bottom: 1px solid var(--gray-200);
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
}

.modal-close {
    width: 36px;
    height: 36px;
    border: none;
    background: var(--gray-100);
    border-radius: var(--radius-md);
    font-size: 1.5rem;
    color: var(--gray-500);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--gray-200);
    color: var(--gray-700);
}

.modal-body {
    padding: var(--spacing-xl);
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--spacing-md);
    padding: var(--spacing-lg) var(--spacing-xl);
    border-top: 1px solid var(--gray-200);
    background: var(--gray-50);
}

/* Signature Modal */
.signature-modal {
    max-width: 600px;
}

.signature-instruction {
    text-align: center;
    color: var(--gray-600);
    margin-bottom: var(--spacing-md);
}

#signatureCanvas {
    width: 100%;
    border: 2px dashed var(--gray-300);
    border-radius: var(--radius-lg);
    background: var(--gray-50);
    cursor: crosshair;
}

.signature-actions {
    text-align: center;
    margin-top: var(--spacing-md);
}

/* ========================================
   FORM ELEMENTS
   ======================================== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--spacing-sm);
}

.form-input,
.form-select {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    color: var(--gray-800);
    background: white;
    transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px var(--primary-100);
}

.form-input::placeholder {
    color: var(--gray-400);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.form-row-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

/* ========================================
   TOAST NOTIFICATIONS
   ======================================== */
.toast-container {
    position: fixed;
    top: var(--spacing-xl);
    right: var(--spacing-xl);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    min-width: 300px;
    animation: slideInRight 0.3s ease;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100px);
    }

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

.toast-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--gray-900);
}

.toast-message {
    font-size: 0.8125rem;
    color: var(--gray-600);
}

.toast-close {
    background: none;
    border: none;
    color: var(--gray-400);
    cursor: pointer;
    font-size: 1.25rem;
}

.toast.success .toast-icon {
    color: var(--success-500);
}

.toast.error .toast-icon {
    color: var(--danger-500);
}

.toast.warning .toast-icon {
    color: var(--warning-500);
}

.toast.info .toast-icon {
    color: var(--info-500);
}

/* ========================================
   SCROLLBAR STYLING (Webkit + Firefox)
   Bold, visible, premium feel
   ======================================== */
/* Firefox */
* {
    scrollbar-width: auto;
    scrollbar-color: #3b82f6 #e2e8f0;
}

.sidebar-nav {
    scrollbar-color: rgba(255, 255, 255, 0.4) rgba(255, 255, 255, 0.1);
}

/* Webkit (Chrome, Edge, Safari) */
::-webkit-scrollbar {
    width: 14px;
    height: 14px;
}

::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
    border-radius: 7px;
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 7px;
    border: 3px solid var(--scrollbar-track);
    min-height: 40px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, #2563eb, #1e3a8a);
}

::-webkit-scrollbar-corner {
    background: var(--scrollbar-track);
}

/* Sidebar scrollbar — lighter for dark bg */
.sidebar-nav::-webkit-scrollbar {
    width: 10px;
}

.sidebar-nav::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 5px;
}

.sidebar-nav::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.35);
    border: 2px solid transparent;
    border-radius: 5px;
}

.sidebar-nav::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.55);
}

/* Scrollable containers */
.content-container,
.modal-body,
.student-list {
    overflow-y: auto;
}

/* ========================================
   FADEOUT ANIMATION (used by toast auto-dismiss)
   ======================================== */
@keyframes fadeOut {
    from {
        opacity: 1;
        transform: translateX(0);
    }

    to {
        opacity: 0;
        transform: translateX(100px);
    }
}

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

/* ========================================
   GLASSMORPHISM CARD ACCENT
   ======================================== */
.card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
    border-left: 3px solid var(--primary-500);
}

/* ========================================
   MOBILE SIDEBAR OVERLAY
   ======================================== */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.5);
    z-index: 99;
}

.sidebar-overlay.active {
    display: block;
}

/* ========================================
   RESPONSIVE: Tablet (768px–1279px)
   ======================================== */
@media (max-width: 1279px) {
    :root {
        --sidebar-width: 240px;
    }

    .grid-2 {
        grid-template-columns: 1fr;
    }

    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .certification-banner {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-lg);
    }
}

/* ========================================
   RESPONSIVE: Mobile (below 768px)
   ======================================== */
@media (max-width: 768px) {

    /* Sidebar becomes slide-out drawer */
    .sidebar {
        position: fixed;
        left: -280px;
        top: 0;
        width: 280px;
        min-width: 280px;
        height: 100vh;
        z-index: 200;
        transition: left var(--transition-normal);
    }

    .sidebar.open {
        left: 0;
    }

    .hamburger-btn {
        display: flex;
    }

    .app-container {
        flex-direction: column;
    }

    .main-content {
        width: 100%;
        flex: 1;
    }

    .top-header {
        flex-wrap: wrap;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
        min-height: auto;
    }

    .header-center {
        order: -1;
        width: 100%;
    }

    .live-clock {
        min-width: auto;
    }

    .header-right {
        width: 100%;
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .student-selector {
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
    }

    .student-dropdown {
        width: 100%;
        min-width: 0;
    }

    .grid-4 {
        grid-template-columns: 1fr;
    }

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

    .content-container {
        padding: var(--spacing-md);
    }

    .activity-header {
        display: none;
    }

    .activity-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
        padding: var(--spacing-lg);
        background: white;
        border-radius: var(--radius-lg);
        margin-bottom: var(--spacing-md);
        box-shadow: var(--shadow-sm);
        border: 1px solid var(--gray-200);
    }

    .activity-row>* {
        display: flex;
        justify-content: space-between;
        align-items: center;
        width: 100%;
    }

    .activity-row>*::before {
        content: attr(data-label);
        font-weight: 600;
        color: var(--gray-500);
        font-size: 0.75rem;
        text-transform: uppercase;
    }

    .activity-name {
        flex-direction: column;
        align-items: flex-start;
        border-bottom: 1px solid var(--gray-100);
        padding-bottom: var(--spacing-sm);
        margin-bottom: var(--spacing-sm);
    }

    .activity-name::before {
        display: none;
    }

    .activity-input {
        width: 100%;
        max-width: none;
    }

    .activity-actions {
        justify-content: flex-end;
        padding-top: var(--spacing-sm);
        border-top: 1px solid var(--gray-100);
    }

    .toast-container {
        left: var(--spacing-md);
        right: var(--spacing-md);
        top: auto;
        bottom: var(--spacing-md);
    }

    .toast {
        min-width: auto;
    }

    .modal {
        width: 95%;
        margin: var(--spacing-md);
        max-height: 95vh;
    }

    .student-profile-header {
        flex-direction: column;
        text-align: center;
        padding: var(--spacing-lg);
    }

    .student-avatar {
        margin-right: 0;
        margin-bottom: var(--spacing-md);
    }

    .student-profile-body {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-md);
        padding: var(--spacing-lg);
    }
}

/* ========================================
   RESPONSIVE: Small Mobile (below 480px)
   ======================================== */
@media (max-width: 480px) {
    .student-profile-body {
        grid-template-columns: 1fr;
    }

    .category-tabs {
        flex-direction: column;
    }

    .page-title {
        font-size: 1.15rem;
    }

    .page-subtitle {
        font-size: 0.75rem;
    }

    .clock-time {
        font-size: 1rem;
    }

    .btn {
        width: 100%;
    }

    .modal-footer {
        flex-direction: column;
    }

    .modal-footer .btn {
        width: 100%;
    }
}

/* ========================================
   NAV-LINK ACTIVE STATE — PULSE DOT
   ======================================== */
.nav-link.active {
    position: relative;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    background: #22c55e;
    border-radius: 50%;
    box-shadow: 0 0 6px #22c55e, 0 0 12px rgba(34, 197, 94, 0.4);
    animation: navPulse 2s ease-in-out infinite;
}

@keyframes navPulse {

    0%,
    100% {
        opacity: 1;
        box-shadow: 0 0 6px #22c55e;
    }

    50% {
        opacity: 0.6;
        box-shadow: 0 0 12px #22c55e, 0 0 20px rgba(34, 197, 94, 0.3);
    }
}

/* ========================================
   INSTRUCTOR LOGIN OVERLAY
   ======================================== */
.login-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 40%, #3b82f6 100%);
    background-size: 400% 400%;
    animation: loginGradientShift 12s ease infinite;
}

@keyframes loginGradientShift {
    0% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

.login-overlay.hidden {
    display: none;
}

.login-container {
    width: 100%;
    max-width: 420px;
    margin: 0 var(--spacing-lg);
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-2xl) var(--spacing-xl);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3), 0 0 60px rgba(59, 130, 246, 0.15);
    color: white;
}

.login-logo {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.login-logo-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto var(--spacing-md);
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.3);
}

.login-title {
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: white;
}

.login-subtitle {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.65);
    margin-top: 4px;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.login-field label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 6px;
}

.login-field input {
    width: 100%;
    padding: 14px 16px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
    color: white;
    font-size: 1rem;
    font-family: var(--font-family);
    transition: all var(--transition-fast);
    outline: none;
}

.login-field input::placeholder {
    color: rgba(255, 255, 255, 0.35);
}

.login-field input:focus {
    border-color: #60a5fa;
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

.login-error {
    background: rgba(239, 68, 68, 0.2);
    border: 1px solid rgba(239, 68, 68, 0.4);
    border-radius: var(--radius-md);
    padding: 10px 14px;
    font-size: 0.85rem;
    color: #fca5a5;
    text-align: center;
}

.login-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    border: none;
    border-radius: var(--radius-lg);
    color: white;
    font-size: 1rem;
    font-weight: 700;
    font-family: var(--font-family);
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(59, 130, 246, 0.5);
    background: linear-gradient(135deg, #60a5fa, #2563eb);
}

.login-btn:active {
    transform: translateY(0);
}

.login-footer {
    text-align: center;
    margin-top: var(--spacing-xl);
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.4);
}

/* Shake animation for wrong password */
@keyframes loginShake {

    0%,
    100% {
        transform: translateX(0);
    }

    20% {
        transform: translateX(-12px);
    }

    40% {
        transform: translateX(12px);
    }

    60% {
        transform: translateX(-8px);
    }

    80% {
        transform: translateX(8px);
    }
}

.login-container.shake {
    animation: loginShake 0.5s ease;
}

/* ========================================
   SIDEBAR ENHANCED STYLING
   ======================================== */
.sidebar {
    box-shadow: 4px 0 25px rgba(0, 0, 0, 0.15);
}

.sidebar-header {
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

/* Stat cards hover glow */
.stat-card {
    transition: all var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg), 0 0 20px rgba(59, 130, 246, 0.1);
}

/* ========================================
   LOGOUT BUTTON
   ======================================== */
.sidebar-footer {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.logout-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 10px;
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-md);
    color: #fca5a5;
    font-size: 0.85rem;
    font-weight: 600;
    font-family: var(--font-family);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.logout-btn:hover {
    background: rgba(239, 68, 68, 0.25);
    border-color: rgba(239, 68, 68, 0.5);
    color: #f87171;
}

/* ========================================
   MODAL FOOTER BUTTON SPACING
   ======================================== */
.modal-footer {
    gap: var(--spacing-md);
}

.modal-footer .btn+.btn {
    margin-left: var(--spacing-sm);
}

/* ========================================
   EXIT/LOGOUT BUTTON (Header)
   ======================================== */
.btn-exit {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: linear-gradient(135deg, var(--primary-600), var(--primary-800));
    border: 1px solid var(--primary-700);
    border-radius: var(--radius-md);
    color: #fff;
    font-size: 0.85rem;
    font-weight: 600;
    font-family: var(--font-family);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-exit:hover {
    background: linear-gradient(135deg, var(--primary-700), var(--primary-900));
    box-shadow: 0 4px 12px rgba(30, 58, 138, 0.4);
    transform: translateY(-1px);
}

.btn-exit svg {
    flex-shrink: 0;
}

/* ========================================
   MOBILE SCROLLING FIXES
   ======================================== */
.content-container {
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

.module-card-body {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.activity-header,
.activity-row {
    min-width: 700px;
}

/* ========================================
   ENHANCED MODULE CARD — STATUS HEADING
   ======================================== */
.module-card {
    margin-bottom: var(--spacing-lg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--glass-bg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-normal);
}

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

.module-card-header {
    position: relative;
    padding: var(--spacing-md) var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-800), var(--primary-600));
    color: #fff;
}

.module-card-header.yard-demo {
    background: linear-gradient(135deg, #065f46, #059669);
}

.module-card-header.yard-practice {
    background: linear-gradient(135deg, #92400e, #d97706);
}

.module-card-header.in-cab {
    background: linear-gradient(135deg, #581c87, #7c3aed);
}

.module-number {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 0.9rem;
    margin-right: var(--spacing-md);
    flex-shrink: 0;
}

.module-name {
    font-weight: 700;
    font-size: 1rem;
}

.module-meta {
    font-size: 0.8rem;
    opacity: 0.85;
    margin-top: 2px;
}

.module-hours-badge {
    text-align: center;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-md);
    padding: 6px 14px;
    flex-shrink: 0;
}

.module-hours-value {
    font-size: 1.3rem;
    font-weight: 800;
}

.module-hours-label {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    opacity: 0.8;
}

.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--gray-50);
    border-top: 1px solid var(--gray-200);
    font-size: 0.85rem;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.status-completed {
    background: var(--success-100);
    color: var(--success-700);
}

.status-in-progress {
    background: var(--warning-100);
    color: var(--warning-600);
}

/* ========================================
   CATEGORY HEADING WITH COMPLETION STATUS
   ======================================== */
.category-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-50), var(--primary-100));
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary-500);
}

.category-heading h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--primary-900);
    margin: 0;
}

.category-heading .completion-summary {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.85rem;
    font-weight: 600;
}

.category-heading .completion-summary .badge-complete {
    background: var(--success-100);
    color: var(--success-700);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
}

.category-heading .completion-summary .badge-incomplete {
    background: var(--warning-100);
    color: var(--warning-600);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
}

/* ========================================
   MOBILE-SPECIFIC IMPROVEMENTS
   ======================================== */
@media (max-width: 768px) {
    .header-right {
        flex-wrap: wrap;
        gap: var(--spacing-sm) !important;
    }

    .student-selector {
        width: 100%;
    }

    .btn-exit {
        padding: 6px 12px;
        font-size: 0.78rem;
    }

    .sidebar-nav {
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        max-height: calc(100vh - 200px);
    }

    .category-heading {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .category-heading h3 {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .btn-exit {
        width: auto;
        flex: 0 0 auto;
    }

    .header-right {
        justify-content: center;
    }
}

/* ========================================
   PRINT STYLES
   ======================================== */
@media print {

    .sidebar,
    .sidebar-overlay,
    .top-header,
    .login-overlay,
    .toast-container,
    .logout-btn,
    .btn-exit,
    #addStudentBtn,
    .hamburger-btn,
    .student-selector {
        display: none !important;
    }

    .main-content {
        margin-left: 0 !important;
        padding: 0 !important;
    }

    .content-container {
        overflow: visible !important;
    }

    .module-card {
        break-inside: avoid;
        page-break-inside: avoid;
    }
}