/* ==========================================================================
   VIANOVA ALTUS - Design System & Base Styles
   ========================================================================== */

:root {
    /* Color Palette (60-30-10 Rule) */
    /* 60% Primary Backgrounds */
    --clr-white: #ffffff;
    --clr-light-gray: #f8f9fa;
    --clr-border: #e2e8f0;

    /* 30% Secondary Backgrounds (Navy/Midnight) */
    --clr-midnight: #0b192c;
    --clr-midnight-light: #152c4a;

    /* 10% Accent/CTA (Impact Gold) */
    --clr-gold: #ebb134;
    --clr-gold-hover: #f0c35c;

    /* Text Colors */
    --clr-text-main: #2d3748;
    --clr-text-muted: #718096;
    --clr-text-inverse: #f7fafc;

    /* Typography */
    --font-body: 'Inter', system-ui, -apple-system, sans-serif;
    --font-heading: 'Montserrat', sans-serif;

    /* Spacing & Layout */
    --layout-max-width: 1200px;
    --spacing-xs: 0.5rem;
    /* 8px */
    --spacing-sm: 1rem;
    /* 16px */
    --spacing-md: 2rem;
    /* 32px */
    --spacing-lg: 4rem;
    /* 64px */
    --spacing-xl: 6.25rem;
    /* 100px (80-120px rule) */

    /* Effects */
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --transition-fast: 0.2s ease-in-out;
    --transition-normal: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-slow: 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

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

body {
    font-family: var(--font-body);
    color: var(--clr-text-main);
    background-color: var(--clr-white);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    color: var(--clr-midnight);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    letter-spacing: -0.01em;
}

h3 {
    font-size: clamp(1.25rem, 2vw, 1.5rem);
}

h4 {
    font-size: 1.125rem;
}

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

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

ul {
    list-style: none;
}

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

/* Utilities */
.container {
    width: 100%;
    max-width: var(--layout-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

.bg-light {
    background-color: var(--clr-light-gray);
}

.bg-midnight {
    background-color: var(--clr-midnight);
    color: var(--clr-text-inverse);
}

.bg-midnight h2,
.bg-midnight h3 {
    color: var(--clr-white);
}

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

.text-white {
    color: var(--clr-white) !important;
}

.text-gold {
    color: var(--clr-gold) !important;
}

.text-midnight {
    color: var(--clr-midnight) !important;
}

.lead-text {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--clr-text-main);
}

.mt-small {
    margin-top: var(--spacing-sm);
}

.mt-medium {
    margin-top: var(--spacing-md);
}

.mt-large {
    margin-top: var(--spacing-lg);
}

.mb-small {
    margin-bottom: var(--spacing-sm);
}

.mb-large {
    margin-bottom: var(--spacing-lg);
}

.gap-small {
    gap: var(--spacing-sm);
}

.gap-medium {
    gap: var(--spacing-md);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 1rem;
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--clr-gold);
    color: var(--clr-midnight);
}

.btn-primary:hover {
    background-color: var(--clr-gold-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--clr-midnight);
    color: var(--clr-white);
}

.btn-secondary:hover {
    background-color: var(--clr-midnight-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary-outline {
    background-color: transparent;
    color: var(--clr-white);
    border-color: var(--clr-white);
}

.btn-secondary-outline:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* Grids */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
}

.grid-span-2 {
    grid-column: span 2;
}

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

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

.flex-horizontal {
    display: flex;
    align-items: center;
}

/* Cards */
.card {
    background: var(--clr-white);
    color: var(--clr-text-main);
    padding: var(--spacing-md);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.dark-card {
    background: var(--clr-midnight-light);
    color: var(--clr-text-inverse);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.dark-card p {
    color: #cbd5e0;
}

/* ==========================================================================
   Header Navigation
   ========================================================================== */
#main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 1.5rem 0;
    transition: all var(--transition-fast);
}

#main-header.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 1rem 0;
    box-shadow: var(--shadow-sm);
}

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

.main-nav,
.main-nav ul {
    display: flex;
    align-items: center;
}

.main-nav ul {
    gap: 2rem;
    margin-right: 2rem;
}

.main-nav a {
    font-weight: 500;
    color: var(--clr-white);
}

#main-header.scrolled .main-nav a:not(.btn) {
    color: var(--clr-midnight);
}

#main-header.scrolled .main-nav a:not(.btn):hover {
    color: var(--clr-gold);
}

.main-nav a:not(.btn):hover {
    color: var(--clr-gold);
}

.mobile-toggle {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 6px;
}

.mobile-toggle .bar {
    width: 25px;
    height: 3px;
    background-color: var(--clr-white);
    transition: all 0.3s;
}

#main-header.scrolled .mobile-toggle .bar {
    background-color: var(--clr-midnight);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    position: relative;
    height: 100vh;
    min-height: 700px;
    display: flex;
    align-items: center;
    color: var(--clr-white);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 120%;
    /* For parallax */
    background-size: cover;
    background-position: center;
    z-index: -2;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(11, 25, 44, 0.9) 0%, rgba(11, 25, 44, 0.6) 100%);
    z-index: -1;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    color: var(--clr-white);
}

.hero-content .subheadline {
    font-size: 1.25rem;
    color: #e2e8f0;
    margin-bottom: var(--spacing-md);
}

.hero-cta {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

/* ==========================================================================
   Sections Specifics
   ========================================================================== */

/* Vision/About */
.vision-content {
    max-width: 800px;
    margin: 0 auto;
}

/* Challenge */
.challenge-card .icon-wrap {
    width: 48px;
    height: 48px;
    background: rgba(235, 177, 52, 0.1);
    color: var(--clr-gold);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    border-radius: 50%;
    margin-bottom: var(--spacing-sm);
}

/* Pipeline */
.pipeline-flow {
    justify-content: space-between;
    text-align: center;
    position: relative;
    padding: var(--spacing-md) 0;
}

.pipeline-flow::before {
    content: '';
    position: absolute;
    top: 40px;
    /* center of rings */
    left: 10%;
    right: 10%;
    height: 2px;
    background: var(--clr-border);
    z-index: 0;
}

.pipeline .step {
    flex: 1;
    position: relative;
    z-index: 1;
}

.step-ring {
    width: 80px;
    height: 80px;
    background: var(--clr-white);
    border: 3px solid var(--clr-gold);
    color: var(--clr-midnight);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-family: var(--font-heading);
    font-weight: 700;
    margin: 0 auto var(--spacing-sm);
    box-shadow: var(--shadow-sm);
}

.step-arrow {
    display: none;
}

/* Used in non-flex or mobile fallback */

/* Pathways - Split Layout */
.split-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.abstract-accent-box {
    width: 100%;
    height: 400px;
    background: linear-gradient(45deg, var(--clr-midnight), var(--clr-midnight-light));
    border-radius: 8px;
    position: relative;
    overflow: hidden;
}

.accent-overlay {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(235, 177, 52, 0.15) 0%, transparent 70%);
}

/* Labs Masonry */
.masonry-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    grid-auto-rows: minmax(200px, auto);
    gap: var(--spacing-md);
}

.lab-icon {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 2rem;
    color: var(--clr-gold);
    opacity: 0.8;
    margin-bottom: 1rem;
}

/* Ecosystem Diagram */
.diagram-wrapper {
    display: flex;
    justify-content: center;
    padding: var(--spacing-md) 0;
}

.node-tree {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.node {
    background: var(--clr-midnight);
    color: var(--clr-white);
    padding: 1rem 2rem;
    border-radius: 4px;
    font-weight: 600;
    box-shadow: var(--shadow-md);
    position: relative;
    border-bottom: 3px solid var(--clr-gold);
}

.node.center-node {
    background: var(--clr-white);
    color: var(--clr-midnight);
    border: 2px solid var(--clr-midnight);
    border-bottom: 4px solid var(--clr-gold);
}

.node.bottom-node {
    background: var(--clr-light-gray);
    color: var(--clr-text-main);
    border: 1px solid var(--clr-border);
    border-bottom: 2px solid var(--clr-gold);
}

.node.cta-node {
    border-bottom-color: var(--clr-gold);
    background: rgba(235, 177, 52, 0.1);
}

.connector {
    background: var(--clr-border);
}

.connector.vertical {
    width: 2px;
    height: 40px;
}

.connector.horizontal-split {
    width: 300px;
    height: 2px;
    position: relative;
    margin-top: 40px;
}

.connector.horizontal-split::before,
.connector.horizontal-split::after {
    content: '';
    position: absolute;
    top: 0;
    width: 2px;
    height: 40px;
    background: var(--clr-border);
}

.connector.horizontal-split::before {
    left: 0;
}

.connector.horizontal-split::after {
    right: 0;
}

.node-row {
    display: flex;
    justify-content: space-between;
    width: 300px;
    padding-top: 40px;
    margin-top: -40px;
}

/* Insights / Impact */
.metric-item .number {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1;
    font-family: var(--font-heading);
}

.article-meta {
    font-size: 0.875rem;
    color: var(--clr-text-muted);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.read-more {
    display: inline-block;
    margin-top: 1rem;
    color: var(--clr-midnight);
    font-weight: 600;
}

.read-more:hover {
    color: var(--clr-gold);
}

/* Footer */
.main-footer {
    background-color: #050b14;
    color: #cbd5e0;
    padding: var(--spacing-xl) 0 2rem;
}

.main-footer h4 {
    color: var(--clr-white);
    margin-bottom: 1rem;
}

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

.main-footer a {
    color: #cbd5e0;
}

.main-footer a:hover {
    color: var(--clr-gold);
}

.footer-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.1);
    margin: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-small {
    font-size: 0.85rem;
}

/* ==========================================================================
   Animations
   ========================================================================== */

/* Initial states for Intersection Observer */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

/* In-view classes */
.fade-in-up.is-visible,
.fade-in-left.is-visible,
.fade-in-right.is-visible {
    opacity: 1;
    transform: translate(0);
}

/* Staggered children */
.stagger-children.is-visible>*:nth-child(1) {
    transition-delay: 0.1s;
}

.stagger-children.is-visible>*:nth-child(2) {
    transition-delay: 0.2s;
}

.stagger-children.is-visible>*:nth-child(3) {
    transition-delay: 0.3s;
}

.stagger-children.is-visible>*:nth-child(4) {
    transition-delay: 0.4s;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media (max-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 850px) {
    .grid-3 {
        grid-template-columns: 1fr;
    }

    .split-layout {
        grid-template-columns: 1fr;
    }

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

    .pipeline-flow::before {
        display: none;
    }

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

    .grid-span-2 {
        grid-column: auto;
    }
}

@media (max-width: 768px) {
    #main-header {
        padding: 1rem 0;
    }

    #main-header.scrolled {
        padding: 0.5rem 0;
    }

    .header-container .logo img {
        width: 140px;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

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

    .main-nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background: var(--clr-midnight);
        flex-direction: column;
        justify-content: center;
        transition: right var(--transition-normal);
        padding: 2rem;
    }

    .main-nav.active {
        right: 0;
    }

    .main-nav ul {
        flex-direction: column;
        margin-right: 0;
        margin-bottom: 2rem;
        text-align: center;
    }

    .main-nav a {
        color: var(--clr-white) !important;
        font-size: 1.25rem;
    }

    .mobile-toggle {
        display: flex;
        z-index: 1001;
    }

    .d-desktop {
        display: none;
    }

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