/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */

:root {
    /* Colors */
    --color-primary: #4F46E5;
    --color-primary-dark: #4338CA;
    --color-primary-light: #6366F1;
    --color-secondary: #06B6D4;
    --color-accent: #10B981;
    --color-warning: #F59E0B;

    --color-text-primary: #1F2937;
    --color-text-secondary: #6B7280;
    --color-text-light: #9CA3AF;

    --color-bg-primary: #FFFFFF;
    --color-bg-secondary: #F9FAFB;
    --color-bg-tertiary: #F3F4F6;
    --color-bg-dark: #111827;

    --color-border: #E5E7EB;
    --color-border-light: #F3F4F6;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Space Grotesk', var(--font-primary);

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;

    /* Layout */
    --container-max-width: 1200px;
    --container-padding: 1.5rem;

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

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

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
}

/* ============================================
   Reset & Base Styles
   ============================================ */

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    line-height: 1.2;
    font-weight: 700;
    color: var(--color-text-primary);
}

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

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ============================================
   Utility Classes
   ============================================ */

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

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

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    position: relative;
}

.section-logo-decorator {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-xl);
    opacity: 0;
    transform: translateY(-20px) scale(0.8);
    animation: decoratorAppear 0.8s ease forwards;
}

@keyframes decoratorAppear {
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.decorator-icon {
    width: 60px;
    height: 60px;
    filter: drop-shadow(0 4px 12px rgba(79, 70, 229, 0.15));
    animation: gentlePulse 3s ease-in-out infinite;
}

@keyframes gentlePulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.9;
    }
}

.section-logo-decorator:hover .decorator-icon {
    animation: none;
    transform: scale(1.1) rotate(5deg);
    transition: all var(--transition-base);
}

.section-title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    font-weight: 600;
    font-size: var(--font-size-base);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    text-align: center;
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

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

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

.btn-large {
    padding: 1.125rem 2.5rem;
    font-size: var(--font-size-lg);
}

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

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

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

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

[data-animate="fade-up"] {
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
}

[data-animate="fade-up"][data-delay="100"] { animation-delay: 0.1s; }
[data-animate="fade-up"][data-delay="200"] { animation-delay: 0.2s; }
[data-animate="fade-up"][data-delay="300"] { animation-delay: 0.3s; }
[data-animate="fade-up"][data-delay="400"] { animation-delay: 0.4s; }
[data-animate="fade-up"][data-delay="500"] { animation-delay: 0.5s; }

/* ============================================
   Navigation
   ============================================ */

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

.nav.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
    font-family: var(--font-heading);
    color: var(--color-primary);
}

.logo-icon {
    width: 40px;
    height: 40px;
    color: var(--color-primary);
    transition: all var(--transition-base);
    filter: drop-shadow(0 2px 8px rgba(79, 70, 229, 0.0));
}

.nav-logo:hover .logo-icon {
    transform: scale(1.08) rotate(-2deg);
    filter: drop-shadow(0 4px 12px rgba(79, 70, 229, 0.3));
}

.nav-logo:hover .logo-text {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 50%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Animated logo icon elements */
.logo-icon path,
.logo-icon circle,
.logo-icon line {
    transition: all var(--transition-base);
}

.nav-logo:hover .logo-icon circle {
    r: 4;
}

.logo-text {
    transition: all var(--transition-base);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-2xl);
}

.nav-links a {
    font-weight: 500;
    color: var(--color-text-primary);
    position: relative;
    padding: 0.5rem 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-base);
}

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

.nav-cta {
    padding: 0.625rem 1.5rem !important;
    background: var(--color-primary);
    color: white !important;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.nav-cta::after {
    display: none;
}

.nav-cta:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: var(--spacing-sm);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    transition: all var(--transition-base);
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    background: linear-gradient(135deg, #F0F9FF 0%, #F9FAFB 50%, #F0FDF4 100%);
}

.hero-grid {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(79, 70, 229, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(79, 70, 229, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: float 20s ease-in-out infinite;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-content {
    animation: fadeInUp 1s ease;
}

.hero-title-main {
    display: block;
    font-size: var(--font-size-6xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

.hero-title-sub {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2xl);
    line-height: 1.8;
}

.hero-cta-group {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-3xl);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border-light);
    transition: all var(--transition-base);
}

.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.4;
}

.hero-visual {
    animation: fadeIn 1.5s ease;
    position: relative;
}

.hero-logo-container {
    position: relative;
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    animation: float 6s ease-in-out infinite;
}

.hero-logo-large {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 10px 30px rgba(79, 70, 229, 0.15));
    transition: all var(--transition-slow);
}

.hero-logo-large:hover {
    filter: drop-shadow(0 15px 40px rgba(79, 70, 229, 0.25));
    transform: scale(1.02);
}

.hero-svg {
    width: 100%;
    height: auto;
}

.path-fragment {
    stroke: var(--color-text-light);
    stroke-width: 2;
    fill: none;
    opacity: 0.3;
}

.path-clear {
    stroke: var(--color-primary);
    stroke-width: 3;
    fill: none;
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    animation: drawPath 3s ease forwards 0.5s;
}

@keyframes drawPath {
    to { stroke-dashoffset: 0; }
}

.node {
    fill: var(--color-primary);
    opacity: 0;
    animation: fadeIn 0.5s ease forwards;
}

.node:nth-child(1) { animation-delay: 1s; }
.node:nth-child(2) { animation-delay: 1.5s; }
.node:nth-child(3) { animation-delay: 2s; }
.node:nth-child(4) { animation-delay: 2.5s; }

.clarity-center {
    animation: pulse 3s ease-in-out infinite;
}

/* ============================================
   Challenge Section
   ============================================ */

.challenge-section {
    background: var(--color-bg-secondary);
    position: relative;
    overflow: hidden;
}

.challenge-section::before {
    content: '';
    position: absolute;
    top: 10%;
    right: -100px;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(79, 70, 229, 0.03) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.challenge-section::after {
    content: '';
    position: absolute;
    bottom: 10%;
    left: -100px;
    width: 250px;
    height: 250px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.03) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.challenge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
}

.challenge-card {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 1px solid var(--color-border-light);
}

.challenge-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.challenge-icon {
    width: 60px;
    height: 60px;
    margin-bottom: var(--spacing-lg);
    color: var(--color-primary);
}

.challenge-card h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.challenge-card p {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.challenge-stat {
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    font-weight: 600;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(79, 70, 229, 0.1);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-primary);
}

.challenge-quote {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-2xl);
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.challenge-quote blockquote {
    position: relative;
    padding-left: var(--spacing-2xl);
}

.challenge-quote blockquote::before {
    content: '"';
    position: absolute;
    left: 0;
    top: -10px;
    font-size: 4rem;
    color: var(--color-primary);
    opacity: 0.2;
    font-family: Georgia, serif;
}

.challenge-quote p {
    font-size: var(--font-size-xl);
    color: var(--color-text-primary);
    line-height: 1.7;
    font-style: italic;
    margin-bottom: var(--spacing-md);
}

.challenge-quote cite {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-style: normal;
}

/* ============================================
   Solution Section
   ============================================ */

.solution-hero {
    margin-bottom: var(--spacing-3xl);
}

.solution-visual {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.solution-svg {
    width: 100%;
    height: auto;
}

.svg-label {
    font-size: 14px;
    fill: var(--color-text-secondary);
    font-weight: 600;
}

.node-inactive {
    fill: var(--color-text-light);
    opacity: 0.3;
}

.node-active {
    fill: var(--color-primary);
    opacity: 0.8;
}

.node-central {
    fill: url(#clarity-gradient);
    opacity: 0.6;
}

.connection-weak {
    stroke: var(--color-text-light);
    stroke-width: 1;
    stroke-dasharray: 5, 5;
    opacity: 0.3;
}

.connection-strong {
    stroke: var(--color-primary);
    stroke-width: 2;
    opacity: 0.6;
}

.solution-principles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
}

.principle-card {
    position: relative;
    padding: var(--spacing-2xl);
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.05) 0%, rgba(6, 182, 212, 0.05) 100%);
    border-radius: var(--radius-xl);
    border: 2px solid var(--color-border-light);
    transition: all var(--transition-base);
}

.principle-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
}

.principle-number {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-primary);
    opacity: 0.2;
    margin-bottom: var(--spacing-md);
}

.principle-card h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
}

.principle-card p {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.solution-features {
    margin-bottom: var(--spacing-3xl);
}

.features-title {
    font-size: var(--font-size-3xl);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.feature-item {
    padding: var(--spacing-xl);
    background: white;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
    transition: all var(--transition-base);
}

.feature-item:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.feature-icon {
    width: 50px;
    height: 50px;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.feature-item h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
}

.feature-item p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.solution-outcomes {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-2xl);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.05) 0%, rgba(6, 182, 212, 0.05) 100%);
    border-radius: var(--radius-xl);
    border: 2px solid rgba(16, 185, 129, 0.2);
}

.solution-outcomes h3 {
    font-size: var(--font-size-2xl);
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.outcomes-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.outcome-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-lg);
    color: var(--color-text-primary);
}

.outcome-check {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

/* ============================================
   Approach Section
   ============================================ */

.approach-section {
    background: var(--color-bg-secondary);
    position: relative;
    overflow: hidden;
}

.approach-section::before {
    content: '';
    position: absolute;
    top: 20%;
    left: 5%;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(124, 58, 237, 0.04) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    animation: float 15s ease-in-out infinite;
}

.approach-section::after {
    content: '';
    position: absolute;
    bottom: 15%;
    right: 5%;
    width: 180px;
    height: 180px;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.04) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    animation: float 20s ease-in-out infinite reverse;
}

.approach-timeline {
    max-width: 800px;
    margin: 0 auto var(--spacing-3xl);
}

.timeline-item {
    display: grid;
    grid-template-columns: 60px 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.timeline-marker {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.timeline-dot {
    width: 20px;
    height: 20px;
    background: var(--color-primary);
    border-radius: 50%;
    border: 4px solid white;
    box-shadow: 0 0 0 2px var(--color-primary);
    z-index: 1;
}

.timeline-line {
    flex: 1;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-primary), var(--color-border));
    margin-top: 8px;
}

.timeline-item:last-child .timeline-line {
    display: none;
}

.timeline-content {
    padding-bottom: var(--spacing-xl);
}

.timeline-content h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
}

.timeline-content p {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.approach-principles {
    margin-bottom: var(--spacing-3xl);
}

.approach-principles h3 {
    font-size: var(--font-size-3xl);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

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

.principle-box {
    padding: var(--spacing-xl);
    background: white;
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--color-primary);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.principle-box:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
}

.principle-box h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.principle-box p {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.approach-cta {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
    padding: var(--spacing-2xl);
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.approach-cta h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
}

.approach-cta p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

/* ============================================
   About Section
   ============================================ */

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.about-text h2 {
    margin-bottom: var(--spacing-xl);
}

.about-intro {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-primary);
}

.about-text p {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.about-text h3 {
    font-size: var(--font-size-xl);
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-md);
}

.about-belief {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.05) 0%, rgba(6, 182, 212, 0.05) 100%);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--color-primary);
    margin: var(--spacing-2xl) 0;
}

.belief-icon {
    width: 50px;
    height: 50px;
    flex-shrink: 0;
    color: var(--color-primary);
}

.about-belief p {
    margin: 0;
    font-size: var(--font-size-lg);
    color: var(--color-text-primary);
}

.about-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-svg {
    width: 100%;
    max-width: 400px;
    height: auto;
}

.network-node {
    animation: pulse 3s ease-in-out infinite;
}

.network-node:nth-child(1) { animation-delay: 0s; }
.network-node:nth-child(2) { animation-delay: 0.5s; }
.network-node:nth-child(3) { animation-delay: 1s; }
.network-node:nth-child(4) { animation-delay: 1.5s; }
.network-node:nth-child(5) { animation-delay: 2s; }
.network-node:nth-child(6) { animation-delay: 2.5s; }

/* ============================================
   Contact Section
   ============================================ */

.contact-section {
    background: var(--color-bg-secondary);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
}

.contact-info h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-lg);
}

.contact-info p {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.contact-benefits {
    list-style: none;
    margin-bottom: var(--spacing-2xl);
}

.contact-benefits li {
    position: relative;
    padding-left: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.contact-benefits li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

.contact-assurance {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    background: white;
    border-radius: var(--radius-lg);
    border: 2px solid var(--color-accent);
}

.contact-assurance svg {
    width: 50px;
    height: 50px;
    flex-shrink: 0;
}

.contact-assurance h4 {
    margin-bottom: var(--spacing-xs);
    color: var(--color-accent);
}

.contact-assurance p {
    margin: 0;
    font-size: var(--font-size-sm);
}

.contact-form-container {
    position: relative;
}

.contact-form {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

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

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--color-text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.875rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.checkbox-group {
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-start;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    margin-top: 0.25rem;
    flex-shrink: 0;
}

.checkbox-group label {
    margin: 0;
    font-weight: 400;
    font-size: var(--font-size-sm);
}

.form-success {
    display: none;
    text-align: center;
    padding: var(--spacing-3xl);
}

.form-success.show {
    display: block;
}

.form-success svg {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
}

.form-success h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-accent);
}

.contact-alternative {
    text-align: center;
    margin-top: var(--spacing-2xl);
    color: var(--color-text-secondary);
}

.contact-alternative a {
    color: var(--color-primary);
    font-weight: 600;
}

/* ============================================
   Footer
   ============================================ */

.footer {
    background: var(--color-bg-dark);
    color: white;
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
    font-family: var(--font-heading);
    margin-bottom: var(--spacing-md);
    color: white;
}

.footer-logo .logo-icon {
    color: white;
    transition: all var(--transition-base);
}

.footer-logo:hover {
    transform: translateY(-3px);
    transition: all var(--transition-base);
}

.footer-logo:hover .logo-icon {
    filter: drop-shadow(0 4px 12px rgba(79, 70, 229, 0.5));
    transform: scale(1.08);
}

.footer-logo:hover span {
    background: linear-gradient(135deg, #4F46E5 0%, #06B6D4 50%, #10B981 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-tagline {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-sm);
}

.footer-org {
    color: rgba(255, 255, 255, 0.6);
    font-size: var(--font-size-sm);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.footer-column h4 {
    color: white;
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-base);
}

.footer-column ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

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

.footer-column a:hover {
    color: white;
}

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

.footer-bottom p {
    margin-bottom: var(--spacing-xs);
}

.footer-disclaimer {
    font-size: var(--font-size-xs);
    color: rgba(255, 255, 255, 0.4);
}

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

@media (max-width: 1024px) {
    .hero .container,
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }

    .hero-visual,
    .about-visual {
        order: -1;
        max-width: 500px;
        margin: 0 auto;
    }

    .hero-stats {
        grid-template-columns: repeat(3, 1fr);
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .footer-links {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .section-title {
        font-size: var(--font-size-3xl);
    }

    .hero-title-main {
        font-size: var(--font-size-4xl);
    }

    .hero-title-sub {
        font-size: var(--font-size-xl);
    }

    .hero-cta-group {
        flex-direction: column;
    }

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

    .challenge-grid,
    .features-grid,
    .principles-grid {
        grid-template-columns: 1fr;
    }

    .solution-principles {
        grid-template-columns: 1fr;
    }

    .timeline-item {
        grid-template-columns: 40px 1fr;
        gap: var(--spacing-md);
    }

    .footer-links {
        grid-template-columns: 1fr;
    }

    /* Mobile-optimized logo */
    .hero-logo-container {
        max-width: 350px;
    }

    .section-logo-decorator {
        margin-bottom: var(--spacing-md);
    }

    .decorator-icon {
        width: 50px;
        height: 50px;
    }

    /* Disable parallax and complex animations on mobile */
    .hero-logo-large {
        animation: none !important;
    }

    .challenge-section::before,
    .challenge-section::after,
    .approach-section::before,
    .approach-section::after {
        display: none;
    }
}

@media (max-width: 480px) {
    :root {
        --container-padding: 1rem;
        --spacing-4xl: 3rem;
    }

    .hero-title-main {
        font-size: var(--font-size-3xl);
    }

    .section-title {
        font-size: var(--font-size-2xl);
    }

    .btn {
        padding: 0.75rem 1.5rem;
        font-size: var(--font-size-sm);
    }
}

/* ============================================
   References Section
   ============================================ */

.references-section {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
}

.references-content {
    max-width: 900px;
    margin: 0 auto;
}

.references-list {
    list-style: none;
    counter-reset: reference-counter;
    padding: 0;
    margin: 0;
}

.references-list li {
    counter-increment: reference-counter;
    margin-bottom: var(--spacing-xl);
    padding-left: 3rem;
    position: relative;
    line-height: 1.8;
}

.references-list li::before {
    content: "[" counter(reference-counter) "]";
    position: absolute;
    left: 0;
    top: 0;
    font-weight: 600;
    color: var(--color-primary);
    font-size: var(--font-size-sm);
}

.reference-text {
    display: inline-block;
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
}

.reference-text em {
    font-style: italic;
}

.reference-text a {
    color: var(--color-primary);
    text-decoration: none;
    word-break: break-all;
    transition: color var(--transition-fast);
}

.reference-text a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

.back-link {
    margin-left: var(--spacing-sm);
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

.back-link:hover {
    color: var(--color-primary);
}

.references-note {
    margin-top: var(--spacing-3xl);
    padding: var(--spacing-xl);
    background: var(--color-bg-primary);
    border-left: 4px solid var(--color-primary);
    border-radius: var(--radius-md);
}

.references-note p {
    margin: 0;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

/* Citation Links (inline) */
.citation-link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.75em;
    transition: color var(--transition-fast);
    margin-left: 2px;
}

.citation-link:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

/* Target highlighting for references */
.references-list li:target {
    background-color: #FEF3C7;
    padding: var(--spacing-md);
    margin-left: -var(--spacing-md);
    border-radius: var(--radius-md);
    transition: background-color 2s ease-out;
}

/* Mobile responsive references */
@media (max-width: 768px) {
    .references-list li {
        padding-left: 2.5rem;
        font-size: var(--font-size-sm);
    }

    .references-note {
        padding: var(--spacing-md);
    }
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
    .nav,
    .mobile-menu-toggle,
    .contact-form,
    .footer {
        display: none;
    }

    body {
        font-size: 12pt;
    }

    .section {
        page-break-inside: avoid;
    }

    .references-section {
        page-break-before: always;
    }

    .citation-link {
        color: #000;
    }
}