/* ========================================
   MODERN ACADEMIC DESIGN SYSTEM
   Clean, Professional, Minimalist
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600;700;800&family=Poppins:wght@400;500;600;700;800&display=swap');

:root {
    /* Primary Colors - Academic Navy/Dark Blue */
    --primary: #1E3A8A;
    --primary-dark: #1E293B;
    --primary-medium: #334155;
    --primary-light: #BFDBFE;
    --primary-lighter: #DBEAFE;
    --primary-lightest: #EFF6FF;

    /* Secondary Colors - Professional Teal */
    --secondary: #0D9488;
    --secondary-dark: #0F766E;
    --secondary-light: #99F6E4;
    --secondary-lighter: #CCFBF1;

    /* Accent Colors - Emerald Green */
    --accent: #059669;
    --accent-dark: #047857;
    --accent-light: #A7F3D0;
    --accent-lighter: #D1FAE5;

    /* Supporting Colors - Sky Blue */
    --sky: #0284C7;
    --sky-light: #BAE6FD;
    --sky-lighter: #E0F2FE;

    /* Success & Status */
    --success: #10B981;
    --success-light: #D1FAE5;
    --warning: #F59E0B;
    --warning-light: #FEF3C7;
    --danger: #DC2626;
    --danger-light: #FEE2E2;
    --info: #0EA5E9;
    --info-light: #E0F2FE;

    /* Neutrals - Clean Grays */
    --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;

    /* Semantic Colors */
    --background: #F8FAFC;
    --surface: #FFFFFF;
    --surface-elevated: #FFFFFF;
    --text-primary: #0F172A;
    --text-secondary: #334155;
    --text-muted: #64748B;
    --border: #E2E8F0;
    --border-light: #F1F5F9;

    /* Shadows - Subtle Depth */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    --radius-full: 9999px;

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

    /* Typography - Professional Sans-Serif Stack */
    --font-sans: 'IBM Plex Sans', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    --font-display: 'Poppins', 'IBM Plex Sans', 'Inter', sans-serif;
    --font-mono: 'IBM Plex Mono', 'Consolas', 'Monaco', monospace;

    /* Typography Scale */
    --text-xs: 0.75rem;
    /* 12px */
    --text-sm: 0.875rem;
    /* 14px */
    --text-base: 1rem;
    /* 16px */
    --text-lg: 1.125rem;
    /* 18px */
    --text-xl: 1.25rem;
    /* 20px */
    --text-2xl: 1.5rem;
    /* 24px */
    --text-3xl: 1.875rem;
    /* 30px */
    --text-4xl: 2.25rem;
    /* 36px */
    --text-5xl: 3rem;
    /* 48px */

    /* Line Heights */
    --leading-none: 1;
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 2;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========================================
   RESET & BASE STYLES
   ======================================== */

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

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

body {
    font-family: var(--font-sans);
    background:
        /* Hexagon pattern */
        linear-gradient(30deg, transparent 48%, rgba(30, 58, 138, 0.03) 48%, rgba(30, 58, 138, 0.03) 52%, transparent 52%),
        linear-gradient(150deg, transparent 48%, rgba(30, 58, 138, 0.03) 48%, rgba(30, 58, 138, 0.03) 52%, transparent 52%),
        linear-gradient(270deg, transparent 48%, rgba(30, 58, 138, 0.03) 48%, rgba(30, 58, 138, 0.03) 52%, transparent 52%),
        /* Base gradient */
        linear-gradient(135deg, #F0F9FF 0%, #E0F2FE 50%, #DBEAFE 100%);
    background-size: 60px 104px, 60px 104px, 60px 104px, 100% 100%;
    background-position: 0 0, 0 0, 0 0, 0 0;
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: var(--leading-relaxed);
    font-size: var(--text-base);
    font-weight: 400;
    position: relative;
}

/* Animated hexagon accents */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    right: -10%;
    width: 800px;
    height: 800px;
    background:
        radial-gradient(circle, rgba(30, 58, 138, 0.08) 0%, transparent 70%);
    clip-path: polygon(50% 0%,
            100% 25%,
            100% 75%,
            50% 100%,
            0% 75%,
            0% 25%);
    animation: float 20s ease-in-out infinite;
    pointer-events: none;
    z-index: 0;
}

body::after {
    content: '';
    position: fixed;
    bottom: -20%;
    left: -5%;
    width: 600px;
    height: 600px;
    background:
        radial-gradient(circle, rgba(5, 150, 105, 0.06) 0%, transparent 70%);
    clip-path: polygon(50% 0%,
            100% 25%,
            100% 75%,
            50% 100%,
            0% 75%,
            0% 25%);
    animation: float 25s ease-in-out infinite reverse;
    pointer-events: none;
    z-index: 0;
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0) rotate(0deg);
    }

    33% {
        transform: translate(30px, -30px) rotate(120deg);
    }

    66% {
        transform: translate(-20px, 20px) rotate(240deg);
    }
}

#root {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ========================================
   TYPOGRAPHY HIERARCHY
   ======================================== */

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: var(--leading-tight);
    color: var(--text-primary);
    letter-spacing: -0.025em;
    margin-bottom: var(--space-md);
}

h1 {
    font-size: var(--text-4xl);
    font-weight: 800;
    line-height: var(--leading-tight);
    letter-spacing: -0.03em;
    margin-bottom: var(--space-lg);
}

h2 {
    font-size: var(--text-3xl);
    font-weight: 700;
    line-height: var(--leading-tight);
    letter-spacing: -0.025em;
    margin-bottom: var(--space-md);
}

h3 {
    font-size: var(--text-2xl);
    font-weight: 600;
    line-height: var(--leading-snug);
    letter-spacing: -0.02em;
    margin-bottom: var(--space-md);
}

h4 {
    font-size: var(--text-xl);
    font-weight: 600;
    line-height: var(--leading-snug);
    letter-spacing: -0.015em;
    margin-bottom: var(--space-sm);
}

/* Paragraph & Text */
p {
    margin-bottom: var(--space-md);
    line-height: var(--leading-relaxed);
    color: var(--text-secondary);
}

/* Lists */
ul,
ol {
    margin-bottom: var(--space-md);
    padding-left: var(--space-xl);
}

li {
    margin-bottom: var(--space-sm);
    line-height: var(--leading-relaxed);
    color: var(--text-secondary);
}

/* Strong & Emphasis */
strong,
b {
    font-weight: 600;
    color: var(--text-primary);
}

em,
i {
    font-style: italic;
}

/* Small Text */
small {
    font-size: var(--text-sm);
    color: var(--text-muted);
}

/* ========================================
   LAYOUT REFACTOR (Top Nav + Sidebar)
   ======================================== */

/* Main Application Layout Wrapper */
.app-layout {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
    /* Prevent body scroll, handle internally */
    background: var(--background);
}

/* 1. Top Navbar */
.top-navbar {
    height: 64px;
    background: #FFFFFF;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-xl);
    flex-shrink: 0;
    z-index: 20;
    box-shadow: var(--shadow-sm);
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-logo {
    width: 36px;
    height: 36px;
    background-color: var(--primary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.brand-info h1 {
    font-size: 1rem;
    font-weight: 700;
    margin: 0;
    line-height: 1.2;
    color: var(--text-primary);
}

.brand-info p {
    font-size: 0.75rem;
    margin: 0;
    color: var(--text-muted);
}

/* 2. Content Wrapper (Sidebar + Main) */
.content-wrapper {
    display: flex;
    flex: 1;
    overflow: hidden;
    /* Important for independent scrolling */
    position: relative;
}

/* 3. Sidebar (Left) */
.sidebar {
    width: 260px;
    background: #FFFFFF;
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    overflow-y: auto;
    z-index: 10;
    height: 100%;
    /* Fill wrapper */
}

/* Update sidebar header to be simpler since we have top nav */
.sidebar-header {
    display: none;
    /* Hide old sidebar header */
}

.sidebar-content {
    padding: var(--space-md);
    padding-top: var(--space-xl);
    /* Add spacing since header is gone */
}

/* 4. Main Content (Right) */
.main-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-2xl);
    background-color: #F9FAFB;
    position: relative;
}

/* AUTH MODE OVERRIDES */
body.auth-mode .app-layout {
    display: none !important;
}

body.auth-mode .auth-container {
    display: flex !important;
}

/* Clean up old app-container */
.app-container {
    display: none;
    /* Deprecated/Replaced by app-layout */
}

.sidebar-header {
    margin-bottom: var(--space-2xl);
    padding-bottom: var(--space-lg);
    border-bottom: 2px solid var(--border-light);
}

.sidebar-header h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-xs);
    letter-spacing: -0.02em;
}

.sidebar-header p {
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
}

.nav-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: 0.875rem 1rem;
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-base);
    font-weight: 500;
    font-size: 0.9375rem;
    position: relative;
    overflow: hidden;
}

.nav-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    stroke-width: 2.5;
    transition: all var(--transition-base);
}

.nav-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 3px;
    background: var(--primary);
    transform: scaleY(0);
    transition: transform var(--transition-base);
}

.nav-item:hover {
    background: var(--primary-lighter);
    color: var(--primary);
    transform: translateX(4px);
}

.nav-item:hover .nav-icon {
    transform: scale(1.1);
    stroke-width: 2.5;
}

.nav-item:hover::before {
    transform: scaleY(1);
}

.nav-item.active {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--accent-light) 100%);
    color: var(--primary-dark);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.nav-item.active .nav-icon {
    stroke-width: 2.5;
}

.nav-item.active::before {
    transform: scaleY(1);
}

.main-content {
    flex: 1;
    padding: var(--space-2xl);
    overflow-y: auto;
    background: transparent;
}

/* ========================================
   CARDS & SURFACES
   ======================================== */

.card {
    background: var(--surface);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--space-xl);
    border: 1px solid var(--border-light);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

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

.card:hover::before {
    opacity: 1;
}

.card h2 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    letter-spacing: -0.01em;
}

.card h3 {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

/* Card Variants */
.card-stat {
    text-align: center;
    padding: var(--space-xl);
    background: linear-gradient(135deg, var(--surface) 0%, var(--gray-50) 100%);
    border: 2px solid var(--border-light);
    transition: all var(--transition-base);
}

.card-stat:hover {
    border-color: var(--primary-light);
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.card-stat-value {
    font-size: var(--text-5xl);
    font-weight: 800;
    font-family: var(--font-display);
    line-height: 1;
    margin-bottom: var(--space-sm);
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.card-stat-label {
    font-size: var(--text-base);
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card-stat-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--space-md);
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, var(--primary-lighter) 0%, var(--accent-lighter) 100%);
    color: var(--primary);
}

.card-info {
    background: linear-gradient(135deg, var(--info-light) 0%, var(--sky-lighter) 100%);
    border-left: 4px solid var(--info);
}

.card-success {
    background: linear-gradient(135deg, var(--success-light) 0%, var(--accent-lighter) 100%);
    border-left: 4px solid var(--success);
}

.card-warning {
    background: linear-gradient(135deg, var(--warning-light) 0%, #FEF3C7 100%);
    border-left: 4px solid var(--warning);
}

.card-danger {
    background: linear-gradient(135deg, var(--danger-light) 0%, #FEE2E2 100%);
    border-left: 4px solid var(--danger);
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

.dashboard-grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

.dashboard-grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

@media (max-width: 768px) {

    .dashboard-grid-2,
    .dashboard-grid-3 {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   HEADER & ACTIONS
   ======================================== */

.header-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
    gap: var(--space-md);
}

.header-actions h1 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    position: relative;
    padding-bottom: var(--space-sm);
}

.header-actions h1::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
    border-radius: var(--radius-full);
}

/* ========================================
   BUTTONS
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    font-size: 0.9375rem;
    font-weight: 600;
    font-family: var(--font-sans);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width var(--transition-slow), height var(--transition-slow);
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:active {
    transform: scale(0.98);
}

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

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

.btn-danger {
    background: linear-gradient(135deg, var(--danger) 0%, #B91C1C 100%);
    color: white;
}

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Button Variants */
.btn-success {
    background: linear-gradient(135deg, var(--success) 0%, var(--accent) 100%);
    color: white;
}

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

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

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

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
    box-shadow: none;
}

.btn-outline:hover {
    background: var(--primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-outline-secondary {
    background: transparent;
    border: 2px solid var(--secondary);
    color: var(--secondary);
    box-shadow: none;
}

.btn-outline-secondary:hover {
    background: var(--secondary);
    color: white;
    box-shadow: var(--shadow-md);
}

/* Button Sizes */
.btn-sm {
    padding: 0.5rem 1rem;
    font-size: var(--text-sm);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: var(--text-lg);
    font-weight: 700;
}

/* Icon Button */
.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: var(--radius-md);
}

.btn-icon svg {
    width: 20px;
    height: 20px;
}

/* ========================================
   FORMS
   ======================================== */

.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
    letter-spacing: 0.01em;
}

.form-input,
select.form-input {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    color: var(--text-primary);
    background: var(--surface);
    transition: all var(--transition-base);
}

.form-input:hover {
    border-color: var(--gray-300);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-lighter);
    background: var(--surface);
}

.form-input::placeholder {
    color: var(--text-muted);
}

/* ========================================
   TABLES
   ======================================== */

.data-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 0.9375rem;
}

.data-table thead {
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--primary-lighter) 100%);
}

.data-table th {
    padding: 1rem 1.25rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 2px solid var(--border);
}

.data-table th:first-child {
    border-top-left-radius: var(--radius-lg);
}

.data-table th:last-child {
    border-top-right-radius: var(--radius-lg);
}

.data-table td {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-primary);
    transition: background var(--transition-fast);
}

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

.data-table tbody tr:hover {
    background: var(--gray-50);
    box-shadow: var(--shadow-sm);
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

.data-table tbody tr:last-child td:first-child {
    border-bottom-left-radius: var(--radius-lg);
}

.data-table tbody tr:last-child td:last-child {
    border-bottom-right-radius: var(--radius-lg);
}

/* ========================================
   SCHEDULER GRID
   ======================================== */

.scheduler-grid {
    display: grid;
    gap: 2px;
    background: var(--border-light);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.grid-header {
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--primary-lighter) 100%);
    font-weight: 700;
    font-size: 0.875rem;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    min-height: 70px;
}

.grid-cell {
    background: var(--surface);
    padding: 0.75rem;
    min-height: 90px;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    position: relative;
}

.grid-cell::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--primary-lighter) 0%, var(--accent-light) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.grid-cell:hover::before {
    opacity: 0.5;
}

.grid-cell:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-md);
    z-index: 1;
}

.grid-cell>* {
    position: relative;
    z-index: 1;
}

/* ========================================
   MODAL
   ======================================== */

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    animation: fadeIn var(--transition-base);
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.modal {
    background: var(--surface);
    padding: var(--space-2xl);
    border-radius: var(--radius-2xl);
    width: 90%;
    max-width: 550px;
    box-shadow: var(--shadow-2xl);
    border: 1px solid var(--border-light);
    animation: slideUp var(--transition-slow);
    position: relative;
    overflow: hidden;
}

.modal::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-lg);
    border-bottom: 2px solid var(--border-light);
}

.modal-header h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.modal-body {
    margin-bottom: var(--space-xl);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-md);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border-light);
}

/* ========================================
   UTILITIES
   ======================================== */

/* Top Navbar User Actions */
.user-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 12px;
    background: var(--gray-50);
    border-radius: 20px;
    border: 1px solid var(--border);
}

.user-avatar {
    width: 32px;
    height: 32px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
}

.user-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.hidden {
    display: none !important;
}

/* Smooth Scrollbar */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-400);
}