:root {
    /* Main Palette */
    --deep-ocean-blue: #0F2942;
    --bright-teal: #06B6D4;
    --electric-cyan: #22D3EE;
    
    /* DNA Base Pair Colors */
    --adenine: #10B981;
    --thymine: #EF4444;
    --guanine: #FBBF24;
    --cytosine: #3B82F6;
    
    /* Supporting Colors */
    --purple-accent: #8B5CF6;
    --success-green: #059669;
    --warning-amber: #F59E0B;
    --error-red: #DC2626;
    
    /* Neutral Scale - Dark Mode */
    --bg-light: #FAFAFA;
    --bg-dark: #0A1628;
    --surface-light: #FFFFFF;
    --surface-dark: #1E293B;
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --border: #334155;
    
    /* Spacing */
    --xs: 4px;
    --sm: 8px;
    --md: 16px;
    --lg: 24px;
    --xl: 32px;
    --2xl: 48px;
    --3xl: 64px;
    --4xl: 96px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Header / Navigation */
header {
    position: sticky;
    top: 0;
    height: 72px;
    background: rgba(15, 41, 66, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: box-shadow 0.3s ease;
}

header.scrolled {
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

nav {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 var(--xl);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--bright-teal), var(--purple-accent));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 2s ease;
}

.logo:hover .logo-icon {
    transform: rotate(360deg);
}

.nav-links {
    display: flex;
    gap: var(--xl);
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    position: relative;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--electric-cyan);
}

.nav-links a.active {
    color: var(--electric-cyan);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--electric-cyan);
    transition: width 0.3s ease;
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

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

.icon-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    font-size: 20px;
}

.icon-btn:hover {
    background: var(--surface-dark);
    color: var(--electric-cyan);
}

/* Hero Section */
.hero {
    position: relative;
    max-width: 100%;
    min-height: 100vh;
    margin: 0 auto;
    padding: var(--4xl) var(--xl);
    text-align: center;

    background: url("dna-bg.jpeg") no-repeat center center/cover;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 20, 0.75);
}

.hero > * {
    position: relative;
    z-index: 2;
}


.hero h1 {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #F8FAFC, var(--electric-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--lg);
    animation: fadeInUp 0.6s ease-out;
}

.hero .subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--2xl);
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

.cta-buttons {
    display: flex;
    gap: var(--md);
    justify-content: center;
    margin-bottom: var(--3xl);
    animation: fadeInUp 0.6s ease-out 0.4s both;
}

.btn {
    height: 56px;
    padding: 0 var(--xl);
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    display: inline-flex;
    align-items: center;
    gap: var(--sm);
}

.btn-primary {
    background: linear-gradient(135deg, var(--bright-teal), var(--purple-accent));
    color: white;
    box-shadow: 0 8px 24px rgba(6, 182, 212, 0.3);
}

.btn-primary:hover {
    transform: scale(1.05);
    box-shadow: 0 12px 32px rgba(6, 182, 212, 0.4);
}

.btn-primary:active {
    transform: scale(0.96);
}

.btn-secondary {
    background: transparent;
    border: 2px solid var(--border);
    color: var(--text-primary);
}

.btn-secondary:hover {
    border-color: var(--electric-cyan);
    background: rgba(34, 211, 238, 0.1);
}

.btn-sm {
    height: 40px;
    padding: 0 var(--lg);
    font-size: 14px;
}

/* Section Container */
.section-container {
    max-width: 1440px;
    margin: 0 auto;
    padding: var(--3xl) var(--xl);
}

.section-header {
    text-align: center;
    margin-bottom: var(--xl);
}

.section-header h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: var(--sm);
}

.section-header p {
    color: var(--text-secondary);
    font-size: 16px;
}

/* Upload Zone */
.upload-zone {
    max-width: 800px;
    margin: 0 auto var(--2xl);
    height: 280px;
    border: 2px dashed var(--border);
    border-radius: 16px;
    background: var(--surface-dark);
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    animation: fadeInUp 0.6s ease-out 0.6s both;
    overflow: hidden;
}

.upload-zone::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 16px;
    padding: 2px;
    background: linear-gradient(135deg, var(--bright-teal), var(--purple-accent), var(--adenine));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.upload-zone:hover::before {
    opacity: 1;
}

.upload-zone:hover {
    border-color: transparent;
    transform: scale(1.02);
}

.upload-zone.dragover {
    border-color: var(--adenine);
    background: rgba(16, 185, 129, 0.1);
    transform: scale(1.02);
}

.upload-icon {
    font-size: 64px;
    margin-bottom: var(--md);
    animation: float 3s ease-in-out infinite;
}

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

.upload-text h3 {
    font-size: 20px;
    margin-bottom: var(--sm);
}

.upload-text p {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Info Cards */
.info-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--lg);
    max-width: 900px;
    margin: 0 auto;
    animation: fadeInUp 0.6s ease-out 0.8s both;
}

.info-card {
    background: var(--surface-dark);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: var(--lg);
    display: flex;
    align-items: center;
    gap: var(--md);
    transition: all 0.3s ease;
}

.info-card:hover {
    transform: translateY(-4px);
    border-color: var(--bright-teal);
    box-shadow: 0 8px 24px rgba(6, 182, 212, 0.2);
}

.card-icon {
    font-size: 32px;
    flex-shrink: 0;
}

.card-content h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 2px;
}

.card-content p {
    font-size: 14px;
    color: var(--text-primary);
}

.card-content .small {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Vault Section */
.vault-filters {
    display: flex;
    gap: var(--md);
    justify-content: space-between;
    margin-bottom: var(--xl);
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    gap: var(--sm);
}

.filter-btn {
    padding: var(--sm) var(--md);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 14px;
}

.filter-btn:hover {
    color: var(--text-primary);
    border-color: var(--bright-teal);
}

.filter-btn.active {
    background: var(--bright-teal);
    border-color: var(--bright-teal);
    color: white;
}

#sortSelect {
    padding: var(--sm) var(--md);
    background: var(--surface-dark);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 14px;
}

.vault-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--lg);
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--4xl) var(--xl);
}

.empty-icon {
    font-size: 64px;
    margin-bottom: var(--lg);
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 24px;
    margin-bottom: var(--sm);
}

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

/* Modal */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(10, 22, 40, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    animation: fadeIn 0.3s ease;
}

.modal-backdrop.active {
    display: flex;
}

.modal {
    width: 700px;
    max-width: 90vw;
    max-height: 80vh;
    background: var(--surface-dark);
    border-radius: 20px;
    padding: var(--xl);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.6);
    animation: scaleIn 0.3s ease;
    overflow-y: auto;
}

@keyframes scaleIn {
    from {
        transform: scale(0.9);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--lg);
}

.modal-header h2 {
    font-size: 24px;
}

.close-btn {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 24px;
    transition: all 0.3s ease;
    line-height: 1;
}

.close-btn:hover {
    background: var(--deep-ocean-blue);
    color: var(--text-primary);
}

/* Process Flow */
.process-flow {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--xl);
}

.process-stage {
    width: 140px;
    height: 140px;
    background: var(--deep-ocean-blue);
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--border);
    transition: all 0.3s ease;
}

.process-stage.active {
    border-color: var(--electric-cyan);
    box-shadow: 0 0 24px rgba(34, 211, 238, 0.5);
    animation: pulse 2s ease-in-out infinite;
}

.process-stage.completed {
    border-color: var(--adenine);
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 24px rgba(34, 211, 238, 0.5);
    }
    50% {
        box-shadow: 0 0 32px rgba(34, 211, 238, 0.8);
    }
}

.process-stage .icon {
    font-size: 48px;
    margin-bottom: var(--sm);
}

.process-stage .label {
    font-size: 14px;
    font-weight: 600;
    text-align: center;
}

.process-arrow {
    flex: 1;
    height: 2px;
    background: repeating-linear-gradient(
        to right,
        var(--border) 0,
        var(--border) 8px,
        transparent 8px,
        transparent 16px
    );
    position: relative;
    margin: 0 var(--md);
}

.process-arrow::after {
    content: '→';
    position: absolute;
    right: -8px;
    top: -10px;
    color: var(--border);
    font-size: 20px;
}

/* Progress Bar */
.progress-container {
    margin-bottom: var(--lg);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--bright-teal), var(--adenine));
    border-radius: 4px;
    transition: width 0.3s ease;
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.3),
        transparent
    );
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.progress-text {
    display: flex;
    justify-content: space-between;
    margin-top: var(--sm);
    font-size: 14px;
}

.progress-percent {
    font-size: 24px;
    font-weight: 700;
    color: var(--electric-cyan);
}

/* DNA Sequence Viewer */
.dna-viewer {
    background: var(--bg-dark);
    border-radius: 12px;
    padding: var(--md);
    height: 120px;
    overflow: hidden;
    position: relative;
    margin-bottom: var(--lg);
}

.dna-sequence {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    line-height: 1.6;
    white-space: pre-wrap;
    word-break: break-all;
}

.base-a { color: var(--adenine); }
.base-t { color: var(--thymine); }
.base-g { color: var(--guanine); }
.base-c { color: var(--cytosine); }

.dna-viewer::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 40px;
    background: linear-gradient(to bottom, transparent, var(--bg-dark));
    pointer-events: none;
}

/* Statistics Panel */
.stats-panel {
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.05), rgba(139, 92, 246, 0.05));
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: var(--lg);
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--md);
}

.stat-item {
    display: flex;
    align-items: center;
    gap: var(--sm);
}

.stat-item .icon {
    font-size: 16px;
}

.stat-item .label {
    font-size: 13px;
    color: var(--text-secondary);
}

.stat-item .value {
    font-size: 18px;
    font-weight: 600;
    margin-left: auto;
}

.modal-actions {
    margin-top: var(--lg);
    display: flex;
    gap: var(--md);
    justify-content: center;
}

/* Auth Modal */
.auth-modal {
    width: 450px;
}

.auth-tabs {
    display: flex;
    gap: var(--sm);
    margin-bottom: var(--lg);
    background: var(--deep-ocean-blue);
    padding: var(--xs);
    border-radius: 8px;
}

.auth-tab {
    flex: 1;
    padding: var(--sm) var(--md);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.3s ease;
    font-size: 14px;
    font-weight: 500;
}

.auth-tab.active {
    background: var(--surface-dark);
    color: var(--text-primary);
}

.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
}

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

.form-group label {
    display: block;
    margin-bottom: var(--sm);
    color: var(--text-secondary);
    font-size: 14px;
}

.form-group input {
    width: 100%;
    height: 48px;
    background: var(--deep-ocean-blue);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    padding: 0 var(--md);
    font-size: 15px;
    transition: border 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--bright-teal);
}

.auth-message {
    margin-top: var(--md);
    padding: var(--sm) var(--md);
    border-radius: 8px;
    font-size: 14px;
    text-align: center;
}

.auth-message.success {
    background: rgba(5, 150, 105, 0.2);
    color: var(--success-green);
    border: 1px solid var(--success-green);
}

.auth-message.error {
    background: rgba(220, 38, 38, 0.2);
    color: var(--error-red);
    border: 1px solid var(--error-red);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .nav-links {
        display: none;
    }

    .hero h1 {
        font-size: 40px;
    }

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

    .process-flow {
        flex-direction: column;
        gap: var(--lg);
    }

    .process-arrow {
        width: 2px;
        height: 40px;
        margin: var(--md) 0;
        background: repeating-linear-gradient(
            to bottom,
            var(--border) 0,
            var(--border) 8px,
            transparent 8px,
            transparent 16px
        );
    }

    .process-arrow::after {
        content: '↓';
        left: -8px;
        top: auto;
        bottom: -10px;
    }
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 32px;
    }

    .hero .subtitle {
        font-size: 16px;
    }

    .upload-zone {
        height: 200px;
    }

    .cta-buttons {
        flex-direction: column;
        width: 100%;
    }

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

    .modal {
        width: 95vw;
        padding: var(--lg);
    }

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

    .vault-filters {
        flex-direction: column;
    }

    .filter-group {
        width: 100%;
        flex-wrap: wrap;
    }

    #sortSelect {
        width: 100%;
    }
}

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

::-webkit-scrollbar-track {
    background: var(--deep-ocean-blue);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--bright-teal);
}
.nav-dna-icon {
    width: 36px;
    height: 36px;
    object-fit: cover;
    border-radius: 50%;
}
/* Analytics Comparison Table */
.comparison-container {
    display: flex;
    justify-content: center;   /* horizontal center */
    align-items: center;       /* vertical alignment (safe) */
    margin-top: 30px;
}

.comparison-image {
    max-width: 1000px;
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}
.docs-container {
    display: flex;
    justify-content: center;
    margin-top: 40px;
}

.docs-frame {
    width: 90%;
    height: 600px;
    border: none;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.4);
}
/* =========================================
   BIOTECH UI ENHANCEMENTS
========================================= */

body::before{
    content:"";
    position:fixed;
    inset:0;
    background:
        radial-gradient(circle at top left, rgba(34,211,238,0.10), transparent 30%),
        radial-gradient(circle at bottom right, rgba(139,92,246,0.10), transparent 30%);
    pointer-events:none;
    z-index:-1;
}

.upload-zone{
    backdrop-filter: blur(18px);
    background:
        linear-gradient(
            180deg,
            rgba(30,41,59,0.88),
            rgba(15,23,42,0.92)
        );
}

.upload-zone:hover{
    box-shadow:
        0 0 40px rgba(34,211,238,0.15),
        0 0 80px rgba(139,92,246,0.08);
}

.modal{
    background:
        linear-gradient(
            180deg,
            rgba(15,23,42,0.96),
            rgba(10,22,40,0.98)
        );

    border:1px solid rgba(255,255,255,0.06);

    box-shadow:
        0 0 60px rgba(34,211,238,0.08),
        0 20px 80px rgba(0,0,0,0.7);
}

/* PROCESS CARDS */

.process-stage{
    position:relative;
    overflow:hidden;
}

.process-stage::before{
    content:"";
    position:absolute;
    inset:0;

    background:
        linear-gradient(
            120deg,
            transparent,
            rgba(34,211,238,0.08),
            transparent
        );

    transform:translateX(-100%);
    animation:cardShine 4s linear infinite;
}

@keyframes cardShine{
    100%{
        transform:translateX(140%);
    }
}

.process-stage.active{
    transform:translateY(-6px);

    box-shadow:
        0 0 24px rgba(34,211,238,0.45),
        inset 0 0 24px rgba(34,211,238,0.06);
}

/* PROGRESS */

.progress-fill{
    background:
        linear-gradient(
            90deg,
            #06B6D4,
            #22D3EE,
            #8B5CF6,
            #06B6D4
        );

    background-size:200% 100%;

    animation:
        shimmer 1.5s infinite,
        gradientMove 4s linear infinite;
}

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

    100%{
        background-position:200% 50%;
    }
}

.progress-percent{
    font-size:42px;
    text-shadow:0 0 18px rgba(34,211,238,0.5);
}

/* DNA VIEWER */

.dna-viewer{
    border:1px solid rgba(255,255,255,0.06);

    background:
        linear-gradient(
            180deg,
            rgba(5,10,20,0.96),
            rgba(2,6,14,0.98)
        );
}

.dna-viewer::before{
    content:"";
    position:absolute;
    inset:0;

    background:
        linear-gradient(
            rgba(255,255,255,0.025) 1px,
            transparent 1px
        );

    background-size:100% 4px;

    pointer-events:none;
}

.dna-sequence{
    animation:dnaScroll 18s linear infinite;
}

@keyframes dnaScroll{
    from{
        transform:translateY(0);
    }

    to{
        transform:translateY(-40%);
    }
}

.base-a{
    text-shadow:0 0 10px rgba(16,185,129,0.8);
}

.base-t{
    text-shadow:0 0 10px rgba(239,68,68,0.8);
}

.base-g{
    text-shadow:0 0 10px rgba(251,191,36,0.8);
}

.base-c{
    text-shadow:0 0 10px rgba(59,130,246,0.8);
}

/* STATS */

.stat-item{
    background:rgba(255,255,255,0.02);
    border:1px solid transparent;
    border-radius:12px;
    padding:12px;

    transition:all .3s ease;
}

.stat-item:hover{
    border-color:rgba(34,211,238,0.25);

    transform:translateY(-3px);

    box-shadow:
        0 0 20px rgba(34,211,238,0.08);
}

/* HERO ENHANCEMENT */

.hero::after{
    content:"";
    position:absolute;
    inset:0;

    background:
        radial-gradient(circle at center, rgba(34,211,238,0.12), transparent 45%);

    pointer-events:none;
}

.hero h1{
    text-shadow:
        0 0 30px rgba(34,211,238,0.12);
}