/* =================================================================
   Decision-DNA Website Styles
   Design: Professional, clean, DNA-themed with subtle connections
   ================================================================= */

/* === CSS Variables === */
:root {
    /* Colors */
    --color-primary: #0ea5e9;      /* Sky blue - trust & tech */
    --color-primary-dark: #0284c7;
    --color-secondary: #10b981;     /* Green - success */
    --color-accent: #f59e0b;        /* Amber - attention */
    --color-dark: #0f172a;          /* Slate 900 */
    --color-gray: #475569;          /* Slate 600 */
    --color-light-gray: #cbd5e1;    /* Slate 300 */
    --color-bg-light: #f8fafc;      /* Slate 50 */
    --color-white: #ffffff;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Layout */
    --max-width: 1280px;
    --border-radius: 0.5rem;
    --border-radius-lg: 1rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* === Reset & Base === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    font-weight: var(--font-weight-normal);
    line-height: 1.6;
    color: var(--color-dark);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* === Typography === */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
}

p {
    margin-bottom: var(--spacing-sm);
}

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

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

/* === Buttons === */
.btn {
    display: inline-block;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    text-align: center;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
}

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

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
}

.btn-large {
    padding: 1.125rem 2.5rem;
    font-size: 1.125rem;
}

/* === Layout === */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

.section-intro {
    font-size: 1.125rem;
    color: var(--color-gray);
    max-width: 800px;
    margin: 0 auto;
}

/* === Navigation === */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-light-gray);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1rem var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-dark);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* === Hero Section === */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: calc(80px + var(--spacing-lg)) var(--spacing-md) var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-bg-light) 0%, #e0f2fe 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(14, 165, 233, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.hero-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    animation: fadeInUp 0.8s ease-out;
}

.hero-title {
    margin-bottom: var(--spacing-md);
    color: var(--color-dark);
}

.hero-title .highlight {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--color-gray);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.hero-ctas {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.hero-visual {
    animation: fadeIn 1s ease-out 0.3s both;
}

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

.hero-split-left,
.hero-split-right {
    text-align: center;
}

.visual-label {
    margin-top: var(--spacing-sm);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-gray);
}

.paperwork-stack,
.interface-preview {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: transform var(--transition-normal);
}

.paperwork-stack:hover,
.interface-preview:hover {
    transform: translateY(-4px);
}

.paper-icon,
.interface-icon {
    width: 100%;
    height: auto;
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-gray);
    font-size: 0.875rem;
    animation: bounce 2s infinite;
}

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* === DNA Story Section === */
.dna-story {
    padding: var(--spacing-xl) var(--spacing-md);
    background-color: var(--color-white);
}

.dna-philosophy {
    position: relative;
    background: linear-gradient(135deg, #f0f9ff 0%, #ecfdf5 100%);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    border: 2px solid var(--color-light-gray);
    overflow: hidden;
}

.dna-pattern-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0.03;
    background-image: 
        repeating-linear-gradient(45deg, var(--color-primary) 0px, var(--color-primary) 2px, transparent 2px, transparent 10px),
        repeating-linear-gradient(-45deg, var(--color-secondary) 0px, var(--color-secondary) 2px, transparent 2px, transparent 10px);
    pointer-events: none;
}

.philosophy-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
}

.philosophy-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    color: var(--color-dark);
}

.dna-icon {
    color: var(--color-primary);
    flex-shrink: 0;
}

.philosophy-content p {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--color-gray);
}

.philosophy-content strong {
    color: var(--color-dark);
    font-weight: var(--font-weight-semibold);
}

/* === Scrollytelling Section === */
.scrollytelling {
    padding: var(--spacing-xl) 0;
    background: var(--color-bg-light);
    min-height: 100vh;
}

.scrolly-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: start;
}

.scrolly-graphic {
    position: sticky;
    top: 120px;
    height: 600px;
}

.case-view {
    position: relative;
    width: 100%;
    height: 100%;
}

.case-step {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.6s ease;
    pointer-events: none;
}

.case-step.active {
    opacity: 1;
    pointer-events: auto;
}

.case-visual {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 4px 20px rgba(0, 0, 0, 0.1));
}

.scrolly-steps {
    padding: var(--spacing-md) 0;
}

.step-item {
    min-height: 400px;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    border-left: 4px solid var(--color-light-gray);
    transition: all var(--transition-normal);
}

.step-item.active {
    border-left-color: var(--color-primary);
    box-shadow: 0 8px 24px rgba(14, 165, 233, 0.15);
    transform: translateX(4px);
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: var(--color-white);
    border-radius: 50%;
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
}

.step-content h3 {
    color: var(--color-dark);
    margin-bottom: var(--spacing-sm);
}

.step-content p {
    color: var(--color-gray);
    font-size: 1.0625rem;
    line-height: 1.7;
}

/* === Approach Section === */
.approach {
    padding: var(--spacing-xl) var(--spacing-md);
    background: linear-gradient(180deg, var(--color-white) 0%, var(--color-bg-light) 100%);
}

.approach-timeline {
    display: flex;
    flex-direction: column;
    gap: 0;
    max-width: 900px;
    margin: 0 auto;
}

.phase-item {
    display: grid;
    grid-template-columns: 80px 1fr 100px;
    gap: var(--spacing-md);
    align-items: center;
    padding: var(--spacing-md);
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: all var(--transition-normal);
}

.phase-item:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    transform: translateY(-4px);
}

.phase-number {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: var(--color-white);
    border-radius: 50%;
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
}

.phase-content h3 {
    color: var(--color-dark);
    margin-bottom: 0.5rem;
}

.phase-content p {
    color: var(--color-gray);
    margin-bottom: 0;
}

.phase-icon {
    color: var(--color-primary);
    opacity: 0.3;
}

.phase-icon svg {
    width: 80px;
    height: 80px;
}

.phase-connector {
    width: 4px;
    height: 40px;
    background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    margin: 0 auto;
    margin-left: 70px;
    border-radius: 2px;
}

/* === Proof Section === */
.proof {
    padding: var(--spacing-xl) var(--spacing-md);
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: var(--color-white);
}

.testimonial {
    max-width: 900px;
    margin: 0 auto var(--spacing-lg);
    text-align: center;
    position: relative;
}

.quote-icon {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.quote-text {
    font-size: 1.5rem;
    font-style: italic;
    font-weight: var(--font-weight-light);
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.95);
}

.cta-block {
    text-align: center;
    max-width: 700px;
    margin: var(--spacing-lg) auto 0;
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.cta-block h3 {
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.cta-block p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-md);
}

/* === Footer === */
.footer {
    background-color: var(--color-dark);
    color: rgba(255, 255, 255, 0.8);
    padding: var(--spacing-lg) var(--spacing-md) var(--spacing-md);
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.footer-tagline {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-sm);
}

.footer-company {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
}

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

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-col h5 {
    color: var(--color-white);
    font-size: 0.875rem;
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.footer-col ul {
    list-style: none;
}

.footer-col li {
    margin-bottom: 0.5rem;
}

.footer-col a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.5);
}

/* === Responsive Design === */

/* Tablet */
@media (max-width: 1024px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .scrolly-container {
        grid-template-columns: 1fr;
    }
    
    .scrolly-graphic {
        position: relative;
        top: 0;
        height: 400px;
        margin-bottom: var(--spacing-md);
    }
    
    .step-item {
        min-height: auto;
    }
    
    .phase-item {
        grid-template-columns: 60px 1fr;
        gap: var(--spacing-sm);
    }
    
    .phase-icon {
        display: none;
    }
    
    .phase-connector {
        margin-left: 58px;
    }
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        --spacing-md: 1.5rem;
        --spacing-lg: 2rem;
        --spacing-xl: 3rem;
    }
    
    .nav-container {
        padding: 0.75rem var(--spacing-sm);
    }
    
    .logo-text {
        font-size: 1.25rem;
    }
    
    .hero {
        padding: calc(60px + var(--spacing-md)) var(--spacing-sm) var(--spacing-md);
    }
    
    .hero-ctas {
        flex-direction: column;
    }
    
    .hero-ctas .btn {
        width: 100%;
    }
    
    .hero-split {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .scroll-indicator {
        display: none;
    }
    
    .section-intro {
        font-size: 1rem;
    }
    
    .scrolly-graphic {
        height: 300px;
    }
    
    .step-item {
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-md);
    }
    
    .step-number {
        width: 40px;
        height: 40px;
        font-size: 1.25rem;
    }
    
    .phase-item {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-sm);
    }
    
    .phase-number {
        margin: 0 auto;
    }
    
    .phase-connector {
        margin: 0 auto;
    }
    
    .quote-text {
        font-size: 1.125rem;
    }
    
    .footer-top {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .footer-links {
        flex-direction: column;
        gap: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.9375rem;
    }
    
    .btn-large {
        padding: 0.875rem 2rem;
        font-size: 1rem;
    }
}

/* === Utility Classes === */
.hidden {
    display: none;
}

.visible {
    display: block;
}

/* === Accessibility === */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus,
.btn:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}