:root {
    --color-primary: #FA3C25;
    --color-primary-dark: #d13319;
    --color-primary-light: rgba(250, 60, 37, 0.08);
    --color-bg: #fafaf9;
    --color-bg-alt: #ffffff;
    --color-text: #1a1a1a;
    --color-text-muted: #6b6b6b;
    --color-border: #e8e8e6;
    --color-success: #10b981;
    --font-display: 'Manrope', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'Space Mono', 'Courier New', monospace;
    --max-width: 1200px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 5rem;
    --border-radius: 12px;
    --border-radius-lg: 20px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.08);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; overflow-x: hidden; }

body {
    font-family: var(--font-display);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border-radius: var(--border-radius);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    font-family: var(--font-display);
}
.btn-primary {
    background-color: var(--color-primary);
    color: white;
    box-shadow: 0 4px 12px rgba(250,60,37,0.2);
}
.btn-primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(250,60,37,0.3);
}
.btn-outline {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}
.btn-outline:hover {
    background-color: var(--color-primary);
    color: white;
}
.btn-large { padding: 1.125rem 2.25rem; font-size: 1.125rem; }

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: rgba(250,250,249,0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}
.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}
.logo-container {
    display: flex;
    align-items: center;
    gap: 0.1rem;
    text-decoration: none;
}
.logo-image { width: 40px; height: 40px; object-fit: contain; }
.logo { font-size: 1.5rem; font-weight: 1000; color: var(--color-primary); }
.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    list-style: none;
}
.nav-link {
    font-weight: 500;
    color: var(--color-text);
    transition: var(--transition);
    text-decoration: none;
}
.nav-link:hover { color: var(--color-primary); }
.nav-link-active { color: var(--color-primary); }
.nav-cta { padding: 0.625rem 1.25rem; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 0.5rem; }
.hamburger {
    display: block; width: 24px; height: 2px;
    background-color: var(--color-text); position: relative; transition: var(--transition);
}
.hamburger::before, .hamburger::after {
    content: ''; position: absolute; width: 24px; height: 2px;
    background-color: var(--color-text); transition: var(--transition);
}
.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }

/* ==========================================
   ABOUT PAGE HERO
========================================== */
.about-hero {
    padding: var(--spacing-xxl) 0 var(--spacing-xl);
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
    position: relative;
    overflow: hidden;
}
.about-hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(250,60,37,0.05) 0%, transparent 70%);
    pointer-events: none;
}
.about-hero-inner {
    position: relative;
    z-index: 1;
    max-width: 760px;
}
.about-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    padding: 0.5rem 1rem;
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    border: 1px solid rgba(250,60,37,0.1);
    font-family: var(--font-mono);
    letter-spacing: 0.02em;
}
.about-hero h1 {
    font-size: 3.75rem;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: var(--spacing-md);
}
.about-hero h1 span { color: var(--color-primary); }
.about-hero-lead {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    line-height: 1.75;
    max-width: 620px;
}

/* ==========================================
   ORIGIN STORY
========================================== */
.origin-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-bg-alt);
}
.origin-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
}
.origin-visual {
    position: relative;
}
.origin-card-stack {
    position: relative;
    height: 340px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.origin-card {
    position: absolute;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    width: 260px;
}
.origin-card.card-back-2 {
    transform: rotate(-8deg) translateX(-30px) translateY(20px);
    background: #f5f5f4;
    border-color: transparent;
    box-shadow: var(--shadow-sm);
}
.origin-card.card-back-1 {
    transform: rotate(-3deg) translateX(-14px) translateY(10px);
    background: #fdf4f2;
    border-color: rgba(250,60,37,0.15);
}
.origin-card.card-front {
    transform: rotate(2deg);
    background: white;
    border-color: var(--color-primary);
    z-index: 3;
    animation: cardFloat 5s ease-in-out infinite;
}
@keyframes cardFloat {
    0%, 100% { transform: rotate(2deg) translateY(0); }
    50% { transform: rotate(2deg) translateY(-10px); }
}
.card-chip {
    width: 36px;
    height: 28px;
    background: linear-gradient(135deg, #e8c840, #c8a820);
    border-radius: 6px;
    margin-bottom: var(--spacing-sm);
}
.card-name-line {
    height: 10px;
    background: var(--color-text);
    border-radius: 3px;
    margin-bottom: 0.375rem;
    width: 70%;
}
.card-title-line {
    height: 8px;
    background: var(--color-border);
    border-radius: 3px;
    margin-bottom: 0.25rem;
    width: 50%;
}
.card-detail-lines {
    margin-top: var(--spacing-sm);
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}
.card-detail-line {
    height: 7px;
    background: var(--color-border);
    border-radius: 3px;
}
.card-detail-line.w80 { width: 80%; }
.card-detail-line.w60 { width: 60%; }
.card-detail-line.w70 { width: 70%; }

/* Crossed-out overlay on back cards */
.origin-card.card-back-2::after {
    content: '✕';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3rem;
    color: rgba(0,0,0,0.08);
    font-weight: 700;
}

.origin-content {}
.section-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}
.origin-content h2 {
    font-size: 2.25rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-md);
}
.origin-content p {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    line-height: 1.75;
    margin-bottom: var(--spacing-md);
}
.origin-content p:last-of-type { margin-bottom: 0; }

/* ==========================================
   REAL USERS SECTION
========================================== */
.users-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-bg);
    position: relative;
}
.users-section::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--color-border);
}
.users-header {
    max-width: 640px;
    margin-bottom: var(--spacing-xl);
}
.users-header h2 {
    font-size: 2.25rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-sm);
}
.users-header p {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    line-height: 1.75;
}
.observations-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
}
.observation-card {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.observation-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), #ff6b5b);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}
.observation-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}
.observation-card:hover::before { transform: scaleX(1); }
.obs-icon {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-sm);
}
.obs-title {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 0.375rem;
}
.obs-desc {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* Improvements timeline */
.improvements-row {
    margin-top: var(--spacing-xl);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg) var(--spacing-xl);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-lg);
}
.improvements-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-primary);
    flex-shrink: 0;
    padding-top: 0.2rem;
    min-width: 110px;
}
.improvements-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.625rem;
}
.improvement-tag {
    background: var(--color-primary-light);
    color: var(--color-primary);
    border: 1px solid rgba(250,60,37,0.15);
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.375rem 0.875rem;
    transition: var(--transition);
}
.improvement-tag:hover {
    background: var(--color-primary);
    color: white;
}

/* ==========================================
   INFRASTRUCTURE SECTION
========================================== */
.infra-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-bg-alt);
}
.infra-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--spacing-xxl);
    align-items: start;
}
.infra-content {}
.infra-content h2 {
    font-size: 2.25rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-md);
}
.infra-content p {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    line-height: 1.75;
    margin-bottom: var(--spacing-lg);
}
.infra-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}
.infra-feature {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
}
.infra-feature-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-primary);
    flex-shrink: 0;
}

.infra-visual {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}
.infra-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    transition: var(--transition);
}
.infra-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}
.infra-card.span-2 {
    grid-column: span 2;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-bg) 100%);
    border-color: rgba(250,60,37,0.2);
}
.infra-card-icon { font-size: 1.75rem; margin-bottom: 0.625rem; }
.infra-card-title { font-size: 0.95rem; font-weight: 700; margin-bottom: 0.25rem; }
.infra-card-desc { font-size: 0.8rem; color: var(--color-text-muted); line-height: 1.5; }

/* ==========================================
   VISION SECTION
========================================== */
.vision-section {
    padding: var(--spacing-xxl) 0;
    background: var(--color-bg);
}
.vision-inner {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}
.vision-inner h2 {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-lg);
}
.vision-inner h2 span { color: var(--color-primary); }
.vision-principles {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0 var(--spacing-xl);
}
.vision-principle {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}
.vp-word {
    font-size: 1.5rem;
    font-weight: 800;
    font-family: var(--font-mono);
    color: var(--color-primary);
}
.vp-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.vp-divider {
    width: 1px;
    height: 50px;
    background: var(--color-border);
    margin-top: 0.25rem;
}
.vision-body {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    line-height: 1.8;
}

/* ==========================================
   FOUNDER SECTION
========================================== */
.founder-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-bg-alt);
}
.founder-card {
    max-width: 720px;
    margin: 0 auto;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    position: relative;
}
.founder-card::before {
    content: '"';
    position: absolute;
    top: -20px;
    left: var(--spacing-xl);
    font-size: 6rem;
    color: var(--color-primary);
    font-family: Georgia, serif;
    line-height: 1;
    opacity: 0.25;
}
.founder-quote {
    font-size: 1.2rem;
    line-height: 1.75;
    color: var(--color-text);
    margin-bottom: var(--spacing-xl);
    font-style: italic;
}
.founder-signature {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}
.founder-avatar {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--color-primary), #ff6b5b);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    font-weight: 700;
    flex-shrink: 0;
}
.founder-name { font-size: 1rem; font-weight: 700; margin-bottom: 0.125rem; }
.founder-title { font-size: 0.875rem; color: var(--color-text-muted); }

/* ==========================================
   CTA SECTION
========================================== */
.about-cta {
    padding: var(--spacing-xxl) 0;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-bg-alt) 100%);
    text-align: center;
    position: relative;
    overflow: hidden;
}
.about-cta::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(250,60,37,0.07) 0%, transparent 70%);
    pointer-events: none;
}
.about-cta-inner { position: relative; z-index: 1; }
.about-cta h2 {
    font-size: 2.25rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-sm);
}
.about-cta p {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}
.about-cta-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

/* Footer */
.footer {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-bg-alt);
    border-top: 1px solid var(--color-border);
}
.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}
.footer-brand { display: flex; flex-direction: column; gap: var(--spacing-xs); }
.footer-logo { display: flex; align-items: center; gap: 0.75rem; }
.footer-tagline { font-size: 0.875rem; color: var(--color-text-muted); }
.footer-nav { display: flex; gap: var(--spacing-md); }
.footer-link {
    font-size: 0.875rem; color: var(--color-text-muted);
    transition: var(--transition); text-decoration: none;
}
.footer-link:hover { color: var(--color-primary); }
.footer-copyright { font-size: 0.875rem; color: var(--color-text-muted); text-align: right; }

.footer-socials {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.footer-social-link {
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.08);
    color: var(--color-text);
    transition: var(--transition);
}

.footer-social-link:hover {
    background: var(--color-primary);
    color: white;
}

.footer-social-icon {
    width: 18px;
    height: 18px;
    display: block;
}

/* Fade-in animations */
.fade-up {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.65s ease, transform 0.65s ease;
}
.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}
.fade-up-delay-1 { transition-delay: 0.1s; }
.fade-up-delay-2 { transition-delay: 0.2s; }
.fade-up-delay-3 { transition-delay: 0.3s; }
.fade-up-delay-4 { transition-delay: 0.4s; }

/* ==========================================
   RESPONSIVE
========================================== */
@media (max-width: 968px) {
    .origin-grid, .infra-grid { grid-template-columns: 1fr; }
    .origin-visual { order: -1; }
    .observations-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 910px) {
    .nav-toggle { display: block; z-index: 1001; }
    .nav-menu {
        position: fixed; top: 0; right: -100%;
        width: min(280px, 80vw); height: 100vh;
        flex-direction: column; justify-content: center;
        gap: var(--spacing-lg); background-color: var(--color-bg-alt);
        box-shadow: var(--shadow-lg); transition: right 0.3s ease;
        padding: var(--spacing-lg);
    }
    .nav-menu.active { right: 0; }
}

@media (max-width: 768px) {
    .container { padding: 0 var(--spacing-md); }
    .about-hero h1 { font-size: 2.5rem; }
    .observations-grid { grid-template-columns: 1fr; }
    .infra-features { grid-template-columns: 1fr; }
    .infra-visual { grid-template-columns: 1fr; }
    .infra-card.span-2 { grid-column: span 1; }
    .vision-principles { flex-wrap: wrap; gap: var(--spacing-sm); }
    .vp-divider { display: none; }
    .about-cta-actions { flex-direction: column; align-items: center; }
    .improvements-row { flex-direction: column; gap: var(--spacing-sm); }
    .footer-content { grid-template-columns: 1fr; text-align: center; gap: var(--spacing-md); }
    .footer-logo { justify-content: center; }
    .footer-nav { justify-content: center; }
    .footer-socials { justify-content: center; }
    .footer-copyright { text-align: center; }
}