/* ========================================
   CERTAINTY API — Landing Page Styles
   Premium, Professional, Risk-Reduction
   ======================================== */

/* CSS Variables */
:root {
    /* Colors */
    --color-bg: #0a0a0b;
    --color-bg-elevated: #111113;
    --color-bg-card: #161618;
    --color-border: #27272a;
    --color-border-light: #3f3f46;
    
    --color-text-primary: #fafafa;
    --color-text-secondary: #a1a1aa;
    --color-text-tertiary: #71717a;
    
    --color-accent: #10b981;
    --color-accent-light: #34d399;
    --color-accent-dark: #059669;
    --color-accent-bg: rgba(16, 185, 129, 0.1);
    
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-success: #10b981;
    
    /* Gradients */
    --gradient-text: linear-gradient(135deg, #10b981 0%, #34d399 50%, #6ee7b7 100%);
    --gradient-glow: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(16, 185, 129, 0.15), transparent);
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(16, 185, 129, 0.15);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* Typography */
h1, h2, h3, h4, h5 {
    font-weight: 600;
    line-height: 1.2;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-accent);
}

/* ========================================
   NAVIGATION
   ======================================== */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 10, 11, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 600;
    font-size: 1.125rem;
}

.logo-icon {
    width: 28px;
    height: 28px;
    color: var(--color-accent);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-links a {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

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

.nav-cta {
    background: var(--color-accent);
    color: var(--color-bg) !important;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-weight: 500;
}

.nav-cta:hover {
    background: var(--color-accent-light);
}

/* ========================================
   HERO SECTION
   ======================================== */

.hero {
    padding: calc(80px + var(--space-4xl)) 0 var(--space-4xl);
    background: var(--gradient-glow);
    text-align: center;
}

.hero-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--color-accent);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-lg);
}

.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto var(--space-2xl);
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--space-3xl);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 1rem;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--color-accent);
    color: var(--color-bg);
}

.btn-primary:hover {
    background: var(--color-accent-light);
    color: var(--color-bg);
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text-primary);
    border: 1px solid var(--color-border-light);
}

.btn-secondary:hover {
    background: var(--color-bg-card);
    border-color: var(--color-text-tertiary);
    color: var(--color-text-primary);
}

/* Trust Items */
.hero-trust {
    display: flex;
    gap: var(--space-2xl);
    justify-content: center;
    flex-wrap: wrap;
}

.trust-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
}

.trust-item svg {
    width: 18px;
    height: 18px;
    color: var(--color-accent);
}

/* ========================================
   SECTION STYLES
   ======================================== */

section {
    padding: var(--space-4xl) 0;
}

.section-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-md);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: var(--space-md);
}

.section-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 700px;
    line-height: 1.7;
}

/* ========================================
   PROBLEM SECTION
   ======================================== */

.problem {
    background: var(--color-bg-elevated);
}

.problem-content {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.problem-content .section-description {
    margin: 0 auto;
}

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

.problem-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
}

.problem-icon {
    width: 48px;
    height: 48px;
    background: rgba(239, 68, 68, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-md);
}

.problem-icon svg {
    width: 24px;
    height: 24px;
    color: var(--color-error);
}

.problem-card h4 {
    font-size: 1.125rem;
    margin-bottom: var(--space-sm);
}

.problem-card p {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
}

/* ========================================
   SOLUTION / CODE DEMO
   ======================================== */

.solution {
    text-align: center;
}

.solution .section-description {
    margin: 0 auto var(--space-3xl);
}

.code-demo {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    text-align: left;
    max-width: 700px;
    margin: 0 auto var(--space-xl);
}

.code-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
}

.code-dots {
    display: flex;
    gap: var(--space-sm);
}

.code-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-border-light);
}

.code-title {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.code-body {
    padding: var(--space-lg);
    overflow-x: auto;
}

.code-body pre {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.7;
}

.code-comment { color: var(--color-text-tertiary); }
.code-key { color: #7dd3fc; }
.code-string { color: #a5f3fc; }
.code-number { color: var(--color-accent); }

/* Response Demo */
.response-demo {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    max-width: 700px;
    margin: 0 auto;
}

.response-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    background: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
}

.response-status {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-success);
}

.response-time {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
}

.response-body {
    padding: var(--space-lg);
}

.response-primary {
    display: flex;
    gap: var(--space-xl);
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
}

.response-decision {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.response-decision.approved svg {
    width: 48px;
    height: 48px;
    color: var(--color-success);
    background: var(--color-accent-bg);
    padding: var(--space-sm);
    border-radius: var(--radius-md);
}

.decision-label {
    display: block;
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.decision-value {
    display: block;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-success);
}

.response-certainty {
    flex: 1;
    min-width: 200px;
}

.certainty-bar {
    height: 8px;
    background: var(--color-border);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--space-sm);
}

.certainty-fill {
    height: 100%;
    background: var(--gradient-text);
    border-radius: var(--radius-full);
}

.certainty-details {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
}

.certainty-grade {
    color: var(--color-success);
    font-weight: 600;
}

.certainty-score {
    font-family: var(--font-mono);
    color: var(--color-text-secondary);
}

.response-signals {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.signal {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.8125rem;
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-bg-elevated);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
}

.signal.verified svg {
    width: 14px;
    height: 14px;
    color: var(--color-success);
}

.response-audit {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
    font-size: 0.875rem;
}

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

.audit-id {
    font-family: var(--font-mono);
    background: var(--color-bg-elevated);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
}

.audit-exportable {
    margin-left: auto;
    color: var(--color-accent);
    font-size: 0.75rem;
}

/* ========================================
   VALUE PROPS
   ======================================== */

.value-props {
    background: var(--color-bg-elevated);
}

.value-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-lg);
}

.value-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: border-color 0.2s ease;
}

.value-card:hover {
    border-color: var(--color-border-light);
}

.value-icon {
    width: 48px;
    height: 48px;
    background: var(--color-accent-bg);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-md);
}

.value-icon svg {
    width: 24px;
    height: 24px;
    color: var(--color-accent);
}

.value-card h4 {
    font-size: 1.125rem;
    margin-bottom: var(--space-sm);
}

.value-card p {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* ========================================
   FOR WHOM SECTION
   ======================================== */

.for-whom {
    text-align: center;
}

.for-whom .section-title {
    margin-bottom: var(--space-3xl);
}

.audience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
    text-align: left;
}

.audience-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
}

.audience-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.audience-icon {
    width: 40px;
    height: 40px;
    background: var(--color-accent-bg);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.audience-icon svg {
    width: 20px;
    height: 20px;
    color: var(--color-accent);
}

.audience-header h4 {
    font-size: 1rem;
}

.audience-card > p {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    margin-bottom: var(--space-md);
}

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

.audience-list li {
    position: relative;
    padding-left: var(--space-lg);
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-xs);
}

.audience-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

/* ========================================
   COMPARISON TABLE
   ======================================== */

.comparison {
    background: var(--color-bg-elevated);
    text-align: center;
}

.comparison .section-title {
    margin-bottom: var(--space-3xl);
}

.comparison-table {
    max-width: 800px;
    margin: 0 auto;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.comparison-header,
.comparison-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
}

.comparison-header {
    background: var(--color-bg-card);
    font-weight: 600;
    font-size: 0.875rem;
}

.comparison-col {
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--color-border);
    text-align: left;
}

.comparison-header .comparison-col.without {
    color: var(--color-text-tertiary);
}

.comparison-header .comparison-col.with {
    color: var(--color-accent);
}

.comparison-row .comparison-col.label {
    font-weight: 500;
    color: var(--color-text-secondary);
}

.comparison-row .comparison-col.without {
    color: var(--color-text-tertiary);
}

.comparison-row .comparison-col.with {
    color: var(--color-text-primary);
}

.comparison-row:last-child .comparison-col {
    border-bottom: none;
}

/* ========================================
   CTA SECTION
   ======================================== */

.cta-section {
    text-align: center;
    background: var(--gradient-glow);
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
}

.cta-title {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    margin-bottom: var(--space-md);
}

.cta-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2xl);
    font-size: 1.0625rem;
}

.waitlist-form {
    margin-bottom: var(--space-xl);
}

.form-row {
    display: flex;
    gap: var(--space-sm);
    max-width: 450px;
    margin: 0 auto var(--space-md);
}

.form-input {
    flex: 1;
    padding: var(--space-md) var(--space-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: 1rem;
    font-family: var(--font-sans);
}

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

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

.form-note {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
}

.cta-contact {
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.cta-contact p {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
}

.cta-contact a {
    color: var(--color-accent);
}

/* ========================================
   FOOTER
   ======================================== */

.footer {
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
    padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    gap: var(--space-3xl);
    margin-bottom: var(--space-2xl);
    flex-wrap: wrap;
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.footer-logo .logo-icon {
    width: 24px;
    height: 24px;
}

.footer-tagline {
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
}

.footer-links {
    display: flex;
    gap: var(--space-3xl);
    flex-wrap: wrap;
}

.footer-col h5 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--color-text-secondary);
}

.footer-col a {
    display: block;
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-sm);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
    flex-wrap: wrap;
    gap: var(--space-md);
}

.footer-region {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.region-icon {
    width: 14px;
    height: 14px;
}

/* ========================================
   RESPONSIVE
   ======================================== */

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-trust {
        flex-direction: column;
        gap: var(--space-md);
    }
    
    .comparison-table {
        font-size: 0.8125rem;
    }
    
    .comparison-col {
        padding: var(--space-sm) var(--space-md);
    }
    
    .form-row {
        flex-direction: column;
    }
    
    .footer-content {
        flex-direction: column;
    }
    
    .footer-links {
        gap: var(--space-xl);
    }
}