:root {
    /* Teal Color Palette */
    --color-primary: #008080;
    --color-primary-light: #20B2AA;
    --color-primary-dark: #006666;
    --color-accent: #00CED1;
    --color-accent-dim: rgba(0, 206, 209, 0.1);

    /* Neutral Colors */
    --color-background: #FFFFFF;
    --color-surface: #F8FAFA;
    --color-surface-elevated: #FFFFFF;
    --color-border: rgba(0, 128, 128, 0.2);
    --color-border-strong: rgba(0, 128, 128, 0.4);

    /* Text Colors */
    --color-text-primary: #1A1A1A;
    --color-text-secondary: #4A5568;
    --color-text-tertiary: #718096;
    --color-text-inverse: #FFFFFF;

    /* Semantic Colors */
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    --color-info: #3B82F6;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 128, 128, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 128, 128, 0.1), 0 2px 4px -1px rgba(0, 128, 128, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 128, 128, 0.1), 0 4px 6px -2px rgba(0, 128, 128, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 128, 128, 0.1), 0 10px 10px -5px rgba(0, 128, 128, 0.04);

    /* Typography */
    --font-primary: 'Inter', 'Google Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
    --font-khmer: 'Siemreap', sans-serif;

    /* Font Sizes */
    --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 */

    /* Spacing */
    --spacing-xs: 0.25rem;
    /* 4px */
    --spacing-sm: 0.5rem;
    /* 8px */
    --spacing-md: 1rem;
    /* 16px */
    --spacing-lg: 1.5rem;
    /* 24px */
    --spacing-xl: 2rem;
    /* 32px */
    --spacing-2xl: 3rem;
    /* 48px */

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

/* Reset & Base Styles */
* {
    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-primary);
    background-color: var(--color-background);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;

    /* Subtle technical grid background */
    background-image:
        linear-gradient(var(--color-border) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
    background-size: 50px 50px;
    background-position: center top;
}

/* Khmer Language Support */
body[lang="km"],
.lang-km {
    font-family: var(--font-khmer);
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-primary);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--color-text-primary);
}

h1 {
    font-size: var(--text-4xl);
}

h2 {
    font-size: var(--text-3xl);
}

h3 {
    font-size: var(--text-2xl);
}

h4 {
    font-size: var(--text-xl);
}

h5 {
    font-size: var(--text-lg);
}

h6 {
    font-size: var(--text-base);
}

p {
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-light);
}

a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Utility Classes */
.mono {
    font-family: var(--font-mono);
    letter-spacing: -0.01em;
}

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

.text-secondary {
    color: var(--color-text-secondary);
}

.text-tertiary {
    color: var(--color-text-tertiary);
}

.text-error {
    color: var(--color-error);
}

.text-success {
    color: var(--color-success);
}

.hidden {
    display: none !important;
}

.mt-1 {
    margin-top: var(--spacing-sm);
}

.mt-2 {
    margin-top: var(--spacing-md);
}

.mt-3 {
    margin-top: var(--spacing-lg);
}

.mt-4 {
    margin-top: var(--spacing-xl);
}

.mb-1 {
    margin-bottom: var(--spacing-sm);
}

.mb-2 {
    margin-bottom: var(--spacing-md);
}

.mb-3 {
    margin-bottom: var(--spacing-lg);
}

.mb-4 {
    margin-bottom: var(--spacing-xl);
}

/* Animations */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(20px);
    }

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.6;
    }
}

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }

    100% {
        background-position: 1000px 0;
    }
}

/* Layout */
#app {
    display: flex;
    min-height: 100vh;
}

/* Sidebar Navigation */
.sidebar {
    width: 280px;
    background: var(--color-surface-elevated);
    border-right: 1px solid var(--color-border-strong);
    padding: var(--spacing-xl) 0;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: fixed;
    height: 100vh;
    z-index: 100;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base);
}

.sidebar-header {
    padding: 0 var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.sidebar-logo {
    color: var(--color-primary);
    font-size: var(--text-3xl);
    font-weight: 800;
    margin-bottom: var(--spacing-xs);
}

.sidebar-subtitle {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.sidebar-brand-image {
    width: 60px;
    margin-top: var(--spacing-lg);
    opacity: 0.8;
    transition: opacity var(--transition-fast);
}

.sidebar-brand-image:hover {
    opacity: 1;
}

/* Navigation Links */
.nav-link {
    display: flex;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-xl);
    text-decoration: none;
    color: var(--color-text-secondary);
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    font-weight: 500;
    border-left: 3px solid transparent;
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link ion-icon {
    font-size: 1.25rem;
    margin-right: var(--spacing-md);
}

.nav-link:hover {
    background: var(--color-accent-dim);
    color: var(--color-primary);
    border-left-color: var(--color-primary-light);
}

.nav-link.active {
    background: var(--color-accent-dim);
    color: var(--color-primary);
    border-left-color: var(--color-primary);
    font-weight: 600;
}

.nav-link.active::after {
    content: '[ACTIVE]';
    margin-left: auto;
    font-size: var(--text-xs);
    opacity: 0.7;
    font-weight: 400;
}

/* Main Content */
.content {
    margin-left: 280px;
    flex: 1;
    padding: var(--spacing-2xl);
    animation: fadeIn 0.4s ease-out;
    max-width: 1400px;
}

.status-bar {
    display: flex;
    gap: var(--spacing-lg);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

/* FUI Panel Component */
.fui-panel {
    position: relative;
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    overflow: hidden;
}

.fui-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.fui-panel:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary-light);
}

.fui-panel:hover::before {
    opacity: 1;
}

/* Panel with accent border */
.fui-panel.accent-border {
    border-left: 4px solid var(--color-primary);
}

/* Hero Frame */
.hero-frame {
    position: relative;
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.hero-frame img {
    display: block;
    width: 100%;
    border-radius: var(--radius-md);
}

/* Buttons */
.fui-btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-xl);
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    overflow: hidden;
    transition: all var(--transition-base);
    min-height: 44px;
    /* Accessibility: touch target */
}

.fui-btn ion-icon {
    font-size: 1.2rem;
}

.fui-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--color-primary);
    transition: left var(--transition-base);
    z-index: -1;
}

.fui-btn:hover {
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.fui-btn:hover::before {
    left: 0;
}

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

.fui-btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Button Variants */
.fui-btn.primary {
    background: var(--color-primary);
    color: var(--color-text-inverse);
}

.fui-btn.primary:hover {
    background: var(--color-primary-dark);
}

/* Input Fields */
.fui-input {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    font-family: var(--font-mono);
    font-size: var(--text-base);
    color: var(--color-text-primary);
    width: 100%;
    max-width: 400px;
    transition: all var(--transition-fast);
}

.fui-input::placeholder {
    color: var(--color-text-tertiary);
}

.fui-input:focus {
    outline: none;
    border-color: var(--color-primary);
    background: var(--color-background);
    box-shadow: 0 0 0 3px var(--color-accent-dim);
}

/* Grid Layouts */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

/* ID Card Component (Team Page) */
.fui-id-card {
    position: relative;
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.fui-id-card::before {
    content: '';
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    width: 30px;
    height: 30px;
    border-top: 2px solid var(--color-primary);
    border-right: 2px solid var(--color-primary);
    border-top-right-radius: var(--radius-sm);
}

.fui-id-card::after {
    content: '';
    position: absolute;
    bottom: var(--spacing-sm);
    left: var(--spacing-sm);
    width: 30px;
    height: 30px;
    border-bottom: 2px solid var(--color-primary);
    border-left: 2px solid var(--color-primary);
    border-bottom-left-radius: var(--radius-sm);
}

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

.id-header {
    width: 100%;
    border-bottom: 1px solid var(--color-border-strong);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    display: flex;
    justify-content: space-between;
    font-size: var(--text-xs);
    color: var(--color-primary);
    font-family: var(--font-mono);
}

.id-photo-frame {
    position: relative;
    width: 120px;
    height: 120px;
    margin: var(--spacing-lg) 0;
    border: 2px solid var(--color-border-strong);
    border-radius: var(--radius-md);
    padding: 4px;
    overflow: hidden;
}

.id-photo-frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-sm);
    filter: grayscale(100%);
    transition: filter var(--transition-base);
}

.fui-id-card:hover .id-photo-frame img {
    filter: grayscale(0%);
}

.id-barcode {
    height: 12px;
    width: 100%;
    background: repeating-linear-gradient(90deg,
            var(--color-text-primary) 0px,
            var(--color-text-primary) 2px,
            transparent 2px,
            transparent 4px);
    margin-top: var(--spacing-lg);
    opacity: 0.3;
    border-radius: var(--radius-sm);
}

/* Mobile Toggle */
.mobile-toggle {
    display: none;
    position: fixed;
    top: var(--spacing-md);
    right: var(--spacing-md);
    z-index: 200;
    background: var(--color-surface-elevated);
    border: 2px solid var(--color-primary);
    box-shadow: var(--shadow-lg);
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-lg);
}

thead {
    font-family: var(--font-mono);
    color: var(--color-primary);
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

th,
td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

tbody tr {
    transition: background var(--transition-fast);
}

tbody tr:hover {
    background: var(--color-accent-dim);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .content {
        padding: var(--spacing-xl);
    }

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

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        width: 85%;
        max-width: 320px;
    }

    .sidebar.open {
        transform: translateX(0);
        box-shadow: var(--shadow-xl);
    }

    .content {
        margin-left: 0;
        width: 100%;
        padding: var(--spacing-lg);
        padding-top: calc(var(--spacing-2xl) + 44px);
        /* Account for mobile toggle */
    }

    .mobile-toggle {
        display: flex;
    }

    .status-bar {
        flex-direction: column;
        gap: var(--spacing-sm);
        font-size: 0.7rem;
    }

    h1 {
        font-size: var(--text-3xl);
    }

    h2 {
        font-size: var(--text-2xl);
    }

    h3 {
        font-size: var(--text-xl);
    }
}

@media (max-width: 480px) {
    :root {
        font-size: 14px;
    }

    .fui-panel {
        padding: var(--spacing-lg);
    }

    .fui-btn {
        width: 100%;
        justify-content: center;
    }

    .grid-2,
    .grid-3 {
        gap: var(--spacing-md);
    }
}

/* Print Styles */
@media print {

    .sidebar,
    .mobile-toggle,
    .status-bar {
        display: none;
    }

    .content {
        margin-left: 0;
        padding: 0;
    }

    .fui-panel {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #000;
    }
}

/* Accessibility - High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --color-border: rgba(0, 128, 128, 0.5);
        --color-border-strong: rgba(0, 128, 128, 0.8);
    }

    .fui-panel {
        border-width: 2px;
    }
}

/* Accessibility - Reduced Motion */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus Visible for Keyboard Navigation */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Selection */
::selection {
    background: var(--color-accent-dim);
    color: var(--color-text-primary);
}