:root {
    /* Premium Design Tokens */
    --bg-900: #0f172a; /* Deep slate */
    --bg-800: #1e293b; 
    --bg-700: #334155;
    
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --primary-glow: rgba(59, 130, 246, 0.4);
    
    --violet: #8b5cf6;
    --cyan: #06b6d4;
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --border-soft: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);
    --glass-card: rgba(15, 23, 42, 0.6);
    
    /* Spacing */
    --gap-section-desktop: 100px;
    --gap-section-tablet: 72px;
    --gap-section-mobile: 48px;
    
    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --duration: 300ms;
}

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

body {
    background: var(--bg-900);
    background-image: 
        radial-gradient(circle at 15% 30%, rgba(59, 130, 246, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 85% 70%, rgba(139, 92, 246, 0.08) 0%, transparent 40%);
    color: var(--text-primary);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--text-primary);
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--duration) var(--ease-out);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--duration) var(--ease-out);
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
    color: #fff;
    box-shadow: 0 8px 20px var(--primary-glow), inset 0 1px 1px rgba(255,255,255,0.2);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(59, 130, 246, 0.6), inset 0 1px 1px rgba(255,255,255,0.3);
}

.btn-ghost {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-soft);
    color: var(--text-secondary);
    backdrop-filter: blur(4px);
}

.btn-ghost:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--border-hover);
    transform: translateY(-1px);
}

.badge {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(59, 130, 246, 0.1);
    color: #60a5fa;
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 24px;
    box-shadow: 0 2px 10px rgba(59, 130, 246, 0.05);
}

.glass-card {
    background: linear-gradient(145deg, rgba(30, 41, 59, 0.7) 0%, rgba(15, 23, 42, 0.8) 100%);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-soft);
    border-radius: 20px;
    box-shadow: 0 15px 35px -5px rgba(0, 0, 0, 0.5), inset 0 1px 1px rgba(255,255,255,0.05);
    transition: transform var(--duration) var(--ease-out), border-color var(--duration);
}

section {
    padding: var(--gap-section-desktop) 0;
}

@media (max-width: 768px) {
    section {
        padding: var(--gap-section-tablet) 0;
    }
}

.sticky-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.75);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--border-soft);
    height: 76px;
    display: flex;
    align-items: center;
}

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

.logo {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.nav-center {
    display: flex;
    gap: 32px;
}

.nav-center a {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
}

.nav-center a:hover {
    color: var(--text-primary);
}

.auth-buttons {
    display: flex;
    gap: 12px;
}

/* 2. Hero */
.hero {
    position: relative;
    padding-top: calc(var(--gap-section-desktop) + 40px);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -20%;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, transparent 60%);
    z-index: -1;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 480px;
    gap: 80px;
    align-items: center;
}

.hero-content h1 {
    font-size: 3.8rem;
    line-height: 1.1;
    margin-bottom: 24px;
    background: linear-gradient(to right, #ffffff, #94a3b8);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 4px 20px rgba(0,0,0,0.5);
}

.subtext {
    font-size: 1.25rem;
    margin-bottom: 40px;
    max-width: 540px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.cta-row {
    display: flex;
    gap: 16px;
}

/* Analyzer Card */
.analyzer-card {
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    background: linear-gradient(145deg, rgba(30, 41, 59, 0.8) 0%, rgba(15, 23, 42, 0.9) 100%);
    border: 1px solid rgba(59, 130, 246, 0.2);
    box-shadow: 0 20px 50px rgba(0,0,0,0.5), inset 0 1px 1px rgba(255,255,255,0.05);
}

.dropzone {
    border: 2px dashed rgba(59, 130, 246, 0.4);
    border-radius: 16px;
    padding: 40px 20px;
    text-align: center;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    transition: all var(--duration);
    cursor: pointer;
    background: rgba(15, 23, 42, 0.4);
}

.dropzone:hover {
    border-color: var(--primary);
    background: rgba(59, 130, 246, 0.1);
    transform: translateY(-2px);
}

.upload-icon {
    color: var(--primary);
}

.file-hint {
    font-size: 0.8rem;
    opacity: 0.8;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.input-dark {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-soft);
    border-radius: 10px;
    padding: 14px 16px;
    color: var(--text-primary);
    font-size: 0.95rem;
    width: 100%;
    transition: all 0.2s;
}

.input-dark:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
    background: rgba(15, 23, 42, 0.8);
}

.chips-row {
    display: flex;
    gap: 8px;
    background: rgba(15, 23, 42, 0.6);
    padding: 6px;
    border-radius: 12px;
    border: 1px solid var(--border-soft);
}

.chip {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 6px;
    transition: all var(--duration);
}

.chip.active {
    background: var(--bg-700);
    color: var(--text-primary);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.btn-full {
    width: 100%;
    margin-top: 8px;
}

/* Responsive Hero */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 48px;
    }
    
    .hero-content {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .hero-content h1 {
        font-size: 2.75rem;
    }
    
    .analyzer-card {
        max-width: 500px;
        margin: 0 auto;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .nav-center {
        display: none;
    }
    
    section {
        padding: var(--gap-section-mobile) 0;
    }
}

/* 3. Trust Strip */
.trust-strip {
    border-bottom: 1px solid var(--border-soft);
    background: rgba(255, 255, 255, 0.02);
    padding: 24px 0;
}

.trust-inner {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 48px;
    flex-wrap: wrap;
}

.trust-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.trust-stats {
    display: flex;
    gap: 32px;
    flex-wrap: wrap;
}

.stat-chip {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    padding: 6px 16px;
    border-radius: 100px;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.stat-val {
    font-weight: 700;
    color: var(--cyan);
}

/* 4. Value Cards */
.value-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.value-card {
    padding: 32px;
    transition: transform var(--duration);
}

.value-card:hover {
    transform: translateY(-5px);
    border-color: rgba(255, 255, 255, 0.2);
}

.value-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

/* 5. How It Works */
.section-title {
    text-align: center;
    font-size: 2.25rem;
    margin-bottom: 56px;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    position: relative;
}

/* Connecting Line */
.steps-grid::before {
    content: '';
    position: absolute;
    top: 24px;
    left: 16%;
    right: 16%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--border-soft), transparent);
    z-index: 0;
}

.step {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.step-num {
    width: 48px;
    height: 48px;
    background: var(--bg-800);
    border: 1px solid var(--border-soft);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--violet);
    margin-bottom: 24px;
    box-shadow: 0 0 20px rgba(124, 58, 237, 0.2);
}

.step h4 {
    font-size: 1.125rem;
    margin-bottom: 8px;
}

@media (max-width: 768px) {
    .trust-inner {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
    
    .value-grid, .steps-grid {
        grid-template-columns: 1fr;
    }
    
    .steps-grid::before {
        display: none;
    }
    
    .step {
        flex-direction: row;
        align-items: flex-start;
        text-align: left;
        gap: 20px;
    }
}

/* 6. Result Preview */
.preview-box {
    padding: 40px;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.preview-header {
    display: flex;
    align-items: center;
    gap: 40px;
    border-bottom: 1px solid var(--border-soft);
    padding-bottom: 32px;
}

.score-ring-lg {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 8px solid var(--border-soft);
    border-top-color: var(--primary);
    border-right-color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    box-shadow: 0 0 30px rgba(59, 130, 246, 0.2);
}

.metrics-row {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.metric {
    padding: 6px 12px;
    border-radius: 6px;
    font-weight: 700;
    font-size: 0.875rem;
}

.metric.good {
    background: rgba(16, 185, 129, 0.15);
    color: #34d399;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.metric.warn {
    background: rgba(245, 158, 11, 0.15);
    color: #fbbf24;
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.check-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.check-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.05rem;
}

.check-list li::before {
    content: '✓';
    color: var(--cyan);
    font-weight: 800;
}

/* 7. Pricing */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    align-items: start;
}

.price-card {
    padding: 32px;
    text-align: center;
    position: relative;
    border: 1px solid var(--border-soft);
}

.price-card.popular {
    border-color: var(--primary);
    box-shadow: 0 0 50px rgba(59, 130, 246, 0.15);
    transform: scale(1.05);
    z-index: 10;
}

.pop-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: white;
    padding: 4px 12px;
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
}

.price {
    font-size: 3rem;
    font-weight: 800;
    margin: 16px 0 32px;
}

.period {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.features {
    list-style: none;
    text-align: left;
    margin-bottom: 32px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

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

/* 8. FAQ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    padding: 24px;
    cursor: pointer;
}

.faq-item summary {
    font-weight: 600;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--text-secondary);
}

.faq-item[open] summary::after {
    content: '-';
}

.faq-item p {
    margin-top: 16px;
    line-height: 1.6;
}

/* 9. Final CTA */
.cta-box {
    text-align: center;
    padding: 80px 0;
}

.cta-box h2 {
    font-size: 2.5rem;
    margin-bottom: 32px;
}

.btn-lg {
    font-size: 1.125rem;
    padding: 16px 48px;
}

.cta-link {
    margin-top: 24px;
}

.cta-link a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-decoration: underline;
    text-decoration-color: rgba(255,255,255,0.2);
}

.cta-link a:hover {
    color: var(--text-primary);
}

/* 10. Footer */
footer {
    border-top: 1px solid var(--border-soft);
    padding: 64px 0;
    background: rgba(0,0,0,0.2);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: 40px;
}

.footer-brand p {
    margin-top: 16px;
    font-size: 0.9rem;
    opacity: 0.6;
}

.footer-col h5 {
    color: var(--text-primary);
    margin-bottom: 24px;
    font-size: 1rem;
}

.footer-col a {
    display: block;
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-size: 0.9rem;
}

.footer-col a:hover {
    color: var(--primary);
}

@media (max-width: 900px) {
    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 480px;
        margin: 0 auto;
    }
    
    .price-card.popular {
        transform: none;
        order: -1; /* Show popular first on mobile */
    }
    
    .preview-header {
        flex-direction: column;
        text-align: center;
    }
    
    .metrics-row {
        justify-content: center;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .footer-brand {
        grid-column: span 2;
        text-align: center;
    }
}

/* Account Bar Upgrade Dropdown */
.account-dropdown {
    position: relative;
    display: inline-block;
    cursor: pointer;
}

.account-dropdown-content {
    display: none;
    position: absolute;
    right: 0;
    top: 100%;
    margin-top: 8px;
    background: var(--bg-700);
    min-width: 220px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    border-radius: 12px;
    border: 1px solid var(--border-soft);
    z-index: 2000;
    overflow: hidden;
    animation: slideDown 0.2s ease-out forwards;
}

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

.account-dropdown.open .account-dropdown-content {
    display: block;
}

.dropdown-item {
    padding: 12px 16px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    color: var(--text-secondary);
    border-bottom: 1px solid rgba(255,255,255,0.05);
    transition: background 0.2s;
}

.dropdown-item:last-child {
    border-bottom: none;
}

.dropdown-item:hover {
    background: rgba(255,255,255,0.05);
}

.dropdown-item strong {
    color: var(--text-primary);
    font-size: 0.95rem;
}

.dropdown-item span {
    font-size: 0.8rem;
}

.dropdown-btn {
    margin-top: 8px;
    width: 100%;
    padding: 8px;
    font-size: 0.85rem;
}

/* Custom Modal */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.modal-overlay.show {
    opacity: 1;
    pointer-events: all;
}

.custom-modal {
    background: var(--bg-800);
    border: 1px solid var(--border-soft);
    border-radius: 16px;
    padding: 32px;
    max-width: 400px;
    width: 90%;
    text-align: center;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    transform: scale(0.95);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal-overlay.show .custom-modal {
    transform: scale(1);
}

.modal-icon {
    width: 48px;
    height: 48px;
    background: rgba(245, 158, 11, 0.1);
    color: #fbbf24;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.custom-modal h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.custom-modal p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 24px;
    line-height: 1.5;
}

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

.modal-actions button {
    flex: 1;
}

.btn-danger {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.2);
    color: #ef4444;
}

    /* Added styling for image preview container in hero section */


/* Auth flow specific elements */
#landing-analyze-btn {
    position: relative;
}

#landing-analyze-btn.loading {
    color: transparent;
}

#landing-analyze-btn.loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spinner 0.8s linear infinite;
}

@keyframes spinner {
    to { transform: rotate(360deg); }
}


/* Section 7: Pricing */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    max-width: 800px;
    margin: 0 auto;
    gap: 32px;
}

.price-card {
    padding: 40px 32px;
    display: flex;
    flex-direction: column;
    text-align: center;
    position: relative;
    height: 100%;
}

.price-card.popular {
    border: 1px solid var(--primary);
    box-shadow: 0 0 40px rgba(59, 130, 246, 0.15);
}

.pop-badge {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: white;
    padding: 6px 14px;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 700;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.price {
    font-size: 3.5rem;
    font-weight: 800;
    margin: 20px 0;
    color: var(--text-primary);
}

.price .period {
    font-size: 1rem;
    color: var(--text-muted);
    font-weight: 400;
}

.features {
    list-style: none;
    margin: 32px 0;
    text-align: left;
    display: flex;
    flex-direction: column;
    gap: 16px;
    flex: 1;
}

.features li {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.features li::before {
    content: "✓";
    color: var(--primary);
    font-weight: 800;
    flex-shrink: 0;
}

@media (max-width: 768px) {
    .pricing-grid {
        grid-template-columns: 1fr;
        gap: 32px;
        padding: 0 20px;
        max-width: 440px;
    }
    
    .price-card {
        padding: 32px 24px;
    }
    
    .price {
        font-size: 2.75rem;
    }
}