/* 
  Cognispace | Core Stylesheet
  Design System: High-End Minimalist (Anthropic/Stripe/Palantir hybrid)
  Typography & Spacing: Elite Alignment (Linear/Apple read rhythm)
*/

:root {
    /* Color Palette */
    --bg-base: #FAFAFA;   /* Subtle calm background */
    --bg-panel: #FFFFFF;  /* Cards and elevated panels */
    --bg-alt: #F4F4F5;    /* Alternating section background */
    --bg-dark: #09090B;   /* Deep slate/black */

    /* Typography Hierarchy Colors */
    --text-primary: #171717;     /* Medium-high contrast, never pure black */
    --text-secondary: #525252;   /* Extremely readable body text */
    --text-tertiary: #A3A3A3;    /* Muted micro text */
    --text-dark-primary: #F8FAFC; 
    --text-dark-secondary: #94A3B8;

    /* Accents (From logo, used maximally sparingly) */
    --accent-purple: #7C3AED;
    --accent-blue: #2563EB;
    --accent-teal: #0D9488;

    /* Spacing System (The "Rhythm") */
    --sp-1: 0.25rem;
    --sp-2: 0.5rem;
    --sp-3: 0.75rem;
    --sp-4: 1rem;
    --sp-6: 1.5rem;
    --sp-8: 2rem;
    --sp-12: 3rem;
    --sp-16: 4rem;
    --sp-24: 6rem;
    --sp-32: 8rem;    /* Standard section breathing room */
    --sp-40: 10rem;
    --sp-48: 12rem;   /* Hero breathing room */

    /* Layout Constraints */
    --max-width: 1080px;
    --text-max-width: 65ch; /* Optimal reading width */

    /* Micro-interactions */
    --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
    --transition-smooth: 400ms cubic-bezier(0.16, 1, 0.3, 1);
    
    /* Shadows */
    --shadow-card: 0 4px 12px -2px rgba(23, 23, 23, 0.05), 0 0 0 1px rgba(23, 23, 23, 0.04);
    --shadow-card-hover: 0 12px 24px -4px rgba(23, 23, 23, 0.08), 0 0 0 1px rgba(23, 23, 23, 0.06);
    --shadow-btn: 0 1px 2px rgba(0, 0, 0, 0.08), inset 0 1px 0 rgba(255, 255, 255, 0.1);
    --shadow-btn-hover: 0 4px 8px rgba(0, 0, 0, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

/* Reset & Foundation */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { 
    scroll-behavior: smooth; 
    font-size: 16px; 
    background-color: #FFFFFF; /* 🎨 Base background layer */
}

body {
    background-color: transparent; /* 🧩 Allow fixed background layer to be visible */
    color: var(--text-primary);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    position: relative;
}

/* 🧬 Ambient Framework Ribbon (Fixed Left) */
.ambient-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 600px;
    height: 100vh;
    z-index: 9999; /* 🚀 Placed on top of all section backgrounds for unambiguous visibility */
    pointer-events: none;
    background-image: url('assets/ambient-bg.png');
    background-size: cover;
    background-position: left top;
    background-repeat: no-repeat;
    opacity: 0.3; /* 🔍 Increased from 0.15 to ensure visibility on all display types */
    mask-image: linear-gradient(to right, rgba(0,0,0,1) 0%, rgba(0,0,0,1) 35%, rgba(0,0,0,0) 100%);
    -webkit-mask-image: linear-gradient(to right, rgba(0,0,0,1) 0%, rgba(0,0,0,1) 35%, rgba(0,0,0,0) 100%);
    will-change: transform;
}

/* 🔤 Typography System */
h1, h2, h3, h4 {
    font-weight: 500;
    color: var(--text-primary);
}

/* Hero Headline */
h1 {
    font-size: clamp(3rem, 5vw, 4.5rem);
    line-height: 1.05;
    letter-spacing: -0.04em;
    margin-bottom: var(--sp-6);
}

/* Section Headlines */
h2 {
    font-size: clamp(2rem, 3vw, 2.5rem);
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: var(--sp-4);
}

/* Card Headlines */
h3 {
    font-size: 1.25rem;
    line-height: 1.3;
    letter-spacing: -0.01em;
    margin-bottom: var(--sp-2);
}

h4 {
    font-size: 1.125rem;
    line-height: 1.4;
    letter-spacing: -0.01em;
    margin-bottom: var(--sp-2);
}

/* Body Text */
p {
    color: var(--text-secondary);
    font-size: 1.125rem;
    line-height: 1.6;
}

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

/* 🏔 Stacking Hierarchy */
.navbar, header, main, section, footer {
    position: relative;
    /* z-index: 5 removed to allow global background layer to be more easily managed if needed, 
       but currently ambient-bg is on top (9999) */
}

/* 📏 Layout & Spacing System */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--sp-8);
}

/* Section Spacing: "Each section should breathe" */
.section {
    padding: var(--sp-32) 0;
}

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

.bg-dark {
    background-color: var(--bg-dark);
    color: var(--text-dark-primary);
}

.bg-dark h2 { color: var(--text-dark-primary); }
.bg-dark p { color: var(--text-dark-secondary); }

/* Grid Alignments */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: var(--sp-16);
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--sp-8);
}

.align-center { align-items: center; }
.center-text { 
    text-align: center; 
    max-width: var(--text-max-width);
    margin: 0 auto;
}

.mt-large { margin-top: var(--sp-12); }

/* Component: Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: var(--sp-4) 0;
    transition: background-color var(--transition-smooth), padding var(--transition-smooth), border-color var(--transition-smooth);
    background-color: rgba(250, 250, 250, 0.4);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid transparent;
}

.navbar.scrolled {
    background-color: rgba(255, 255, 255, 0.9);
    padding: var(--sp-3) 0;
    border-bottom: 1px solid rgba(0,0,0,0.06);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--sp-8);
}

.logo {
    font-weight: 500;
    font-size: 1.125rem;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    display: flex;
    align-items: center; /* centering for the icon */
    gap: var(--sp-2);     /* explicit gap for structure */
}

.logo-img {
    height: 28px;
    width: auto;
    display: block;
    flex-shrink: 0;
}

/* Component: Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem; /* Clean padding */
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-fast);
    will-change: transform, box-shadow;
    letter-spacing: -0.01em;
}

.btn:active {
    transform: scale(0.97); /* Strict snap */
}

.btn-primary {
    background-color: var(--text-primary);
    color: #FFF;
    border: 1px solid transparent;
    box-shadow: var(--shadow-btn);
}

.btn-primary:hover {
    background-color: #000;
    box-shadow: var(--shadow-btn-hover);
}

.btn-secondary {
    background-color: var(--bg-panel);
    color: var(--text-primary);
    border: 1px solid rgba(0,0,0,0.1);
    box-shadow: 0 1px 2px rgba(0,0,0,0.02);
}

.btn-secondary:hover {
    border-color: rgba(0,0,0,0.15);
    box-shadow: 0 4px 6px rgba(0,0,0,0.04);
}

.btn-ghost {
    background-color: transparent;
    color: var(--text-primary);
}

.btn-ghost:hover {
    background-color: rgba(0,0,0,0.04);
}

.btn-light {
    background-color: var(--text-dark-primary);
    color: var(--bg-dark);
}
.btn-light:hover { background-color: #FFF; }

.btn-ghost-light { color: var(--text-dark-primary); }
.btn-ghost-light:hover { background-color: rgba(255,255,255,0.1); }


/* Layout: Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: var(--sp-24);
    padding-bottom: var(--sp-12);
    z-index: 1;
}

#hero-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
    opacity: 0.6; /* Subdued */
}

.hero-content {
    max-width: var(--text-max-width);
    padding: 0 var(--sp-4);
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    line-height: 1.5;
    color: var(--text-secondary);
    margin: 0 auto var(--sp-8) auto;
    max-width: 55ch; /* Constrained for perfect readability */
}

.hero-actions {
    display: flex;
    gap: var(--sp-4);
    justify-content: center;
}

/* Layout: Content Blocks */
.section-header {
    max-width: var(--text-max-width);
    margin-bottom: var(--sp-12);
}
.section-header p {
    font-size: 1.25rem;
}

/* Component: Cards (Equal spacing and padding) */
.card {
    background-color: var(--bg-panel);
    padding: var(--sp-8); /* Equal breathing room inside */
    border-radius: 12px;
    box-shadow: var(--shadow-card);
    transition: all var(--transition-smooth);
    will-change: transform, box-shadow;
    position: relative;
    display: flex;
    flex-direction: column;
}

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

.card-icon {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    margin-bottom: var(--sp-6);
    background-color: var(--bg-alt);
}

/* Extremely minimal phase indicators mapping to canonical CSIM Hex */
.phase-impulse { background: linear-gradient(135deg, rgba(255, 106, 61, 0.4) 0%, rgba(255, 106, 61, 0.1) 100%); }
.phase-evaluation { background: linear-gradient(135deg, rgba(75, 91, 213, 0.4) 0%, rgba(75, 91, 213, 0.1) 100%); }
.phase-expression { background: linear-gradient(135deg, rgba(47, 184, 166, 0.4) 0%, rgba(47, 184, 166, 0.1) 100%); }

.card p {
    font-size: 1rem; /* Slightly smaller for card body */
    margin-bottom: 0;
}

/* Application specific cards */
.application-card {
    border: 1px solid rgba(0,0,0,0.03);
    box-shadow: none; /* Flatter appearance */
}
.application-card:hover {
    box-shadow: var(--shadow-card);
    border-color: rgba(0,0,0,0.08);
}
.application-card p {
    margin-bottom: var(--sp-6);
    flex-grow: 1; /* Pushes link to bottom */
}

.link-hover {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
    position: relative;
    align-self: flex-start;
}

.link-hover::after {
    content: '';
    position: absolute;
    width: 0;
    height: 1px;
    bottom: -2px;
    left: 0;
    background-color: currentColor;
    transition: width var(--transition-fast);
}

.link-hover:hover::after { width: 100%; }

/* Why it Matters Block */
.content-block {
    max-width: var(--text-max-width);
    margin: 0 auto;
}

.content-block h2 {
    margin-bottom: var(--sp-8);
}

.value-text p {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

.abstract-diagram {
    width: 240px;
    height: 240px;
    position: relative;
    border: 1px solid rgba(0,0,0,0.03);
    border-radius: 50%;
}
.abstract-diagram .line {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 140%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0,0,0,0.06), transparent);
    transform-origin: center;
}
.abstract-diagram .line:nth-child(1) { transform: translate(-50%, -50%) rotate(0deg); }
.abstract-diagram .line:nth-child(2) { transform: translate(-50%, -50%) rotate(60deg); }
.abstract-diagram .line:nth-child(3) { transform: translate(-50%, -50%) rotate(120deg); }

/* Component: Footer Layering */
.footer {
    padding: var(--sp-24) 0 var(--sp-8) 0;
    background-color: var(--bg-alt); /* Light neutral contrasting section */
    font-size: 0.875rem; /* Clean text size boundary */
    color: var(--text-tertiary);
    border-top: 1px solid rgba(0,0,0,0.05);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--sp-12);
    margin-bottom: var(--sp-16);
}

.footer-brand-col {
    max-width: 320px;
}

.footer-col-title {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--sp-4);
    font-size: 0.875rem; 
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--sp-3);
}

.footer-links a {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

.footer-socials {
    display: flex;
    gap: var(--sp-4);
}

.footer-socials a.social-icon {
    color: var(--text-secondary);
    opacity: 0.6;
    transition: opacity var(--transition-fast), color var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.footer-socials a.social-icon:hover {
    opacity: 1;
    color: var(--text-primary);
    background: none;
    border: none;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--sp-8);
    border-top: 1px solid rgba(0,0,0,0.05);
}

/* Micro-Interaction Animations */
.fade-up {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, transform;
}

.fade-up.in-view {
    opacity: 1;
    transform: translateY(0);
}

.stagger-item {
    opacity: 0;
    transform: translateY(15px);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, transform;
}

.staggered-parent.in-view .stagger-item {
    opacity: 1;
    transform: translateY(0);
}
.staggered-parent.in-view .stagger-item:nth-child(1) { transition-delay: 100ms; }
.staggered-parent.in-view .stagger-item:nth-child(2) { transition-delay: 200ms; }
.staggered-parent.in-view .stagger-item:nth-child(3) { transition-delay: 300ms; }

.reveal-text {
    opacity: 0;
    transform: translateY(15px);
    animation: revealUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.delay-1 { animation-delay: 150ms; }
.delay-2 { animation-delay: 300ms; }

@keyframes revealUp {
    0% { opacity: 0; transform: translateY(15px); }
    100% { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
    .section { padding: var(--sp-24) 0; }
    h1 { margin-bottom: var(--sp-4); }
    .hero-subtitle { margin-bottom: var(--sp-6); }
    .hero-actions { flex-direction: column; }
    .flex-between { flex-direction: column; gap: var(--sp-6); text-align: center; }
    .footer-grid { grid-template-columns: 1fr; gap: var(--sp-8); }
}