@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

:root {
  --bg: #080C14;
  --bg-alt: #0F1620;
  --bg-card: #141C2B;
  --text: #E2E8F0;
  --text-muted: #64748B;
  --text-secondary: #94A3B8;
  --border: rgba(56,189,248,0.12);
  --border-subtle: rgba(255,255,255,0.06);
  --primary: #38BDF8;
  --primary-dim: rgba(56,189,248,0.08);
  --primary-glow: rgba(56,189,248,0.18);
  --accent: #C9A84C;
  --accent-dim: rgba(201,168,76,0.1);
  --nav-bg: rgba(8,12,20,0.9);
}
[data-theme="light"] {
  --bg: #F8FAFC;
  --bg-alt: #F1F5F9;
  --bg-card: #FFFFFF;
  --text: #0F172A;
  --text-muted: #64748B;
  --text-secondary: #475569;
  --border: rgba(2,132,199,0.15);
  --border-subtle: rgba(0,0,0,0.06);
  --primary: #0284C7;
  --primary-dim: rgba(2,132,199,0.07);
  --primary-glow: rgba(2,132,199,0.12);
  --accent: #A07828;
  --accent-dim: rgba(160,120,40,0.08);
  --nav-bg: rgba(248,250,252,0.92);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:'Inter',sans-serif;background:var(--bg);color:var(--text);line-height:1.6;overflow-x:hidden;transition:background 0.3s,color 0.3s}

/* NAV */
nav{position:fixed;top:0;left:0;right:0;z-index:100;background:var(--nav-bg);backdrop-filter:blur(16px);border-bottom:1px solid var(--border-subtle);transition:background 0.3s}
.nav-inner{max-width:1200px;margin:0 auto;padding:0 2rem;height:64px;display:flex;align-items:center;justify-content:space-between;gap:2rem}
.logo{font-size:1.2rem;font-weight:800;color:var(--text);text-decoration:none;letter-spacing:-0.02em}
.logo span{color:var(--primary)}
.nav-links{display:flex;align-items:center;gap:2rem}
.nav-links a{color:var(--text-secondary);text-decoration:none;font-size:0.875rem;font-weight:500;transition:color 0.2s}
.nav-links a:hover{color:var(--primary)}
.nav-cta{background:var(--primary-dim);border:1px solid var(--border);color:var(--primary) !important;padding:0.5rem 1.25rem;border-radius:8px;font-weight:600 !important}
.nav-cta:hover{background:var(--primary-glow) !important}
.theme-toggle{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:8px;padding:0.45rem;cursor:pointer;display:flex;align-items:center;color:var(--text-secondary);transition:all 0.2s}
.theme-toggle:hover{color:var(--primary);border-color:var(--border)}
.theme-toggle svg{width:18px;height:18px}

/* MOBILE NAV */
.hamburger{display:none;flex-direction:column;justify-content:center;gap:5px;background:none;border:none;cursor:pointer;padding:6px;z-index:200}
.hamburger span{display:block;width:22px;height:2px;background:var(--text);border-radius:2px;transition:all 0.3s}
.hamburger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.hamburger.open span:nth-child(2){opacity:0}
.hamburger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.mobile-overlay{display:none;position:fixed;inset:0;z-index:150;background:var(--bg);flex-direction:column;align-items:center;justify-content:center;gap:2.5rem;opacity:0;transition:opacity 0.25s}
.mobile-overlay.open{display:flex;opacity:1}
.mobile-overlay a{font-size:1.6rem;font-weight:700;color:var(--text);text-decoration:none;letter-spacing:-0.02em;transition:color 0.2s}
.mobile-overlay a:hover{color:var(--primary)}
.mobile-overlay .mob-cta{color:var(--primary) !important;border:1.5px solid var(--border);padding:0.75rem 2rem;border-radius:10px;font-size:1.2rem !important}

/* CONTAINER */
.container{max-width:1200px;margin:0 auto;padding:0 2rem}
section{padding:6rem 0}
.section-label{font-size:0.7rem;font-weight:700;letter-spacing:0.2em;text-transform:uppercase;color:var(--primary);margin-bottom:1rem}
h2{font-size:clamp(2rem,4vw,3rem);font-weight:800;line-height:1.15;letter-spacing:-0.03em;margin-bottom:1.25rem}
h3{font-size:1.25rem;font-weight:700;margin-bottom:0.75rem}
.section-sub{font-size:1.1rem;color:var(--text-secondary);max-width:640px;line-height:1.7;margin-bottom:3rem}

/* HERO */
#hero{min-height:100vh;display:flex;align-items:center;padding-top:64px;position:relative;overflow:hidden}
.hero-grid{position:absolute;inset:0;background-image:linear-gradient(var(--border-subtle) 1px,transparent 1px),linear-gradient(90deg,var(--border-subtle) 1px,transparent 1px);background-size:60px 60px;mask-image:radial-gradient(ellipse 80% 60% at 50% 50%,black,transparent)}
.hero-content{position:relative;z-index:1;max-width:820px}
.hero-tag{display:inline-flex;align-items:center;gap:0.5rem;font-size:0.75rem;font-weight:600;letter-spacing:0.15em;text-transform:uppercase;color:var(--accent);background:var(--accent-dim);border:1px solid rgba(201,168,76,0.2);padding:0.4rem 1rem;border-radius:100px;margin-bottom:2rem}
.hero-h1{font-size:clamp(2.8rem,6vw,5rem);font-weight:900;line-height:1.08;letter-spacing:-0.04em;margin-bottom:1.5rem}
.hero-h1 em{font-style:normal;color:var(--primary)}
.hero-sub{font-size:1.2rem;color:var(--text-secondary);line-height:1.7;max-width:600px;margin-bottom:2.5rem}
.btn-primary{display:inline-flex;align-items:center;gap:0.75rem;background:var(--primary);color:#0A0E17;font-weight:700;font-size:1rem;padding:0.9rem 2rem;border-radius:10px;text-decoration:none;transition:all 0.2s;letter-spacing:-0.01em}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 32px var(--primary-glow)}
.btn-primary .arrow{font-size:1.2rem;transition:transform 0.2s}
.btn-primary:hover .arrow{transform:translateX(4px)}

/* SCALING TRAP */
#scaling-trap{background:var(--bg-alt)}
.chart-wrapper{background:var(--bg-card);border:1px solid var(--border);border-radius:16px;padding:2rem;margin-top:3rem;overflow:hidden}
#scalingChart{width:100%;max-height:380px}
.chart-legend{display:flex;gap:2rem;margin-top:1.5rem;flex-wrap:wrap}
.legend-item{display:flex;align-items:center;gap:0.5rem;font-size:0.85rem;color:var(--text-secondary)}
.legend-dot-accent{width:32px;height:2px;background:var(--accent);border-radius:2px}
.legend-dot-primary{width:32px;height:3px;background:var(--primary);border-radius:2px}

/* PROBLEM */
.problem-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;margin-top:3rem}
.problem-col-label{font-size:0.75rem;font-weight:700;letter-spacing:0.15em;text-transform:uppercase;margin-bottom:1.25rem;padding-bottom:0.75rem;border-bottom:1px solid var(--border-subtle)}
.problem-col-label.drag{color:#F87171}
.problem-col-label.ceiling{color:#34D399}
.problem-card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:12px;padding:1.25rem 1.5rem;margin-bottom:0.75rem;display:flex;align-items:flex-start;gap:1rem}
.problem-card-icon{font-size:1.2rem;margin-top:2px;flex-shrink:0}
.problem-card h4{font-size:0.95rem;font-weight:600;margin-bottom:0.25rem}
.problem-card p{font-size:0.85rem;color:var(--text-secondary);line-height:1.5}

/* HOW IT WORKS */
#how-it-works{background:var(--bg-alt)}
.phases{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;align-items:center;gap:1rem;margin-top:3rem}
.phase{background:var(--bg-card);border:1px solid var(--border);border-radius:16px;padding:2rem;text-align:center}
.phase-number{font-size:0.75rem;font-weight:800;letter-spacing:0.15em;color:var(--primary);margin-bottom:1rem}
.phase h3{font-size:1.1rem;margin-bottom:0.75rem}
.phase p{font-size:0.875rem;color:var(--text-secondary);line-height:1.6}
.phase-arrow{color:var(--accent);font-size:1.5rem;font-weight:300;text-align:center}

/* HUMAN-AI BRIDGE */
.bridge-wrapper{margin-top:4rem}
.bridge-wrapper h3{margin-bottom:1.5rem;font-size:1.1rem;color:var(--text-secondary);font-weight:600}
.bridge-table{width:100%;border-collapse:collapse;border-radius:12px;overflow:hidden;border:1px solid var(--border-subtle)}
.bridge-table th{padding:0.9rem 1.25rem;font-size:0.75rem;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;background:var(--bg-card);text-align:left;border-bottom:1px solid var(--border-subtle)}
.bridge-table td{padding:0.85rem 1.25rem;font-size:0.875rem;border-bottom:1px solid var(--border-subtle);background:var(--bg-alt)}
.bridge-table tr:last-child td{border-bottom:none}
.bridge-table td:first-child{color:var(--text-secondary)}
.tag-ai{color:var(--primary);font-weight:600}
.tag-human{color:var(--accent);font-weight:600}
.tag-both{color:#A78BFA;font-weight:600}

/* PQRS */
.pqrs-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;margin-top:3rem}
.pqrs-card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:16px;padding:2rem;transition:border-color 0.2s}
.pqrs-card:hover{border-color:var(--border)}
.pqrs-letter{font-size:3rem;font-weight:900;color:var(--primary);line-height:1;margin-bottom:0.25rem}
.pqrs-subtitle{font-size:0.75rem;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;color:var(--accent);margin-bottom:1rem}
.pqrs-card p{font-size:0.875rem;color:var(--text-secondary);line-height:1.6;margin-bottom:0.5rem}

/* WHY K2ALPHA */
#why-us{background:var(--bg-alt)}
.comparison-table{width:100%;border-collapse:collapse;margin-top:3rem;border-radius:16px;overflow:hidden;border:1px solid var(--border-subtle)}
.comparison-table th{padding:1.25rem 1.5rem;font-size:0.8rem;font-weight:700;letter-spacing:0.08em;text-transform:uppercase;border-bottom:1px solid var(--border-subtle);text-align:left}
.comparison-table th.k2{background:var(--primary-dim);color:var(--primary);border-bottom:2px solid var(--primary)}
.comparison-table th.other{background:var(--bg-card);color:var(--text-muted)}
.comparison-table th.row-label{background:var(--bg-alt);width:160px}
.comparison-table td{padding:1rem 1.5rem;font-size:0.875rem;border-bottom:1px solid var(--border-subtle);vertical-align:top;line-height:1.5}
.comparison-table tr:last-child td{border-bottom:none}
.comparison-table td.row-label{font-weight:600;font-size:0.8rem;color:var(--text-muted);background:var(--bg-alt)}
.comparison-table td.k2-cell{background:var(--primary-dim);color:var(--text);font-weight:500}
.comparison-table td.other-cell{background:var(--bg-card);color:var(--text-secondary)}
.check{color:var(--primary);font-weight:700}
.cross{color:var(--text-muted)}

/* SECTORS */
.sectors-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1.5rem;margin-top:3rem}
.sector-card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:16px;padding:2rem;transition:all 0.25s;cursor:default}
.sector-card:hover{border-color:var(--border);transform:translateY(-3px)}
.sector-icon{font-size:2rem;margin-bottom:1rem}
.sector-card h3{font-size:1.1rem;margin-bottom:0.5rem}
.sector-card p{font-size:0.875rem;color:var(--text-secondary);line-height:1.6;margin-bottom:1rem}
.sector-tags{display:flex;flex-wrap:wrap;gap:0.5rem}
.sector-tag{font-size:0.7rem;font-weight:600;letter-spacing:0.08em;text-transform:uppercase;color:var(--primary);background:var(--primary-dim);border:1px solid var(--border);padding:0.3rem 0.75rem;border-radius:100px}

/* RESULTS */
#results{background:var(--bg-alt)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.25rem;margin-top:3rem}
.stat-card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:16px;padding:2rem 1.5rem;text-align:center}
.stat-number{font-size:3rem;font-weight:900;letter-spacing:-0.04em;color:var(--primary);line-height:1;margin-bottom:0.5rem}
.stat-number span{color:var(--accent)}
.stat-desc{font-size:0.8rem;color:var(--text-secondary);line-height:1.5}
.source-note{font-size:0.75rem;color:var(--text-muted);margin-top:2rem;text-align:center;font-style:italic}

/* ENGAGEMENT */
.timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:0;margin-top:3rem;position:relative}
.timeline::before{content:'';position:absolute;top:28px;left:10%;right:10%;height:2px;background:linear-gradient(90deg,var(--border),var(--primary),var(--border));z-index:0}
.timeline-step{text-align:center;position:relative;z-index:1;padding:0 1rem}
.timeline-node{width:56px;height:56px;border-radius:50%;background:var(--bg-card);border:2px solid var(--border);display:flex;align-items:center;justify-content:center;margin:0 auto 1.25rem;font-size:0.75rem;font-weight:800;color:var(--primary)}
.timeline-step.highlight .timeline-node{background:var(--primary-dim);border-color:var(--primary)}
.timeline-step h4{font-size:0.9rem;font-weight:700;margin-bottom:0.4rem}
.timeline-step p{font-size:0.8rem;color:var(--text-secondary);line-height:1.5}
.timeline-step .weeks{font-size:0.7rem;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;color:var(--primary);margin-bottom:0.5rem}
.ip-box{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:1.5rem 2rem;margin-top:3rem;display:flex;align-items:flex-start;gap:1rem}
.ip-box-label{font-size:0.7rem;font-weight:800;letter-spacing:0.15em;text-transform:uppercase;color:var(--accent);flex-shrink:0;margin-top:2px}
.ip-box p{font-size:0.9rem;color:var(--text-secondary);line-height:1.6}
.ip-box strong{color:var(--text)}

/* PARTNERSHIP */
#partnership{background:var(--bg-alt)}
.partnership-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem;margin-top:3rem}
.partnership-card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:16px;padding:2rem}
.partnership-card .p-num{font-size:2.5rem;font-weight:900;color:var(--border);line-height:1;margin-bottom:1rem;letter-spacing:-0.04em}
.partnership-card h4{font-size:1rem;font-weight:700;margin-bottom:0.75rem}
.partnership-card p{font-size:0.875rem;color:var(--text-secondary);line-height:1.7}

/* TEAM */
.team-grid{display:grid;grid-template-columns:1fr 1fr;gap:2rem;margin-top:3rem;max-width:800px}
.team-card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:20px;padding:2rem;display:flex;gap:1.75rem;align-items:flex-start}
.team-photo{width:80px;height:80px;border-radius:14px;object-fit:cover;flex-shrink:0;border:2px solid var(--border)}
.team-info h3{font-size:1.1rem;font-weight:700;color:var(--accent);margin-bottom:0.2rem}
.team-info .role{font-size:0.75rem;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;color:var(--primary);margin-bottom:0.75rem}
.team-info p{font-size:0.825rem;color:var(--text-secondary);line-height:1.6}

/* CTA */
#cta{text-align:center;background:var(--bg)}
#cta h2{font-size:clamp(2rem,5vw,3.5rem);margin-bottom:1rem}
#cta p{color:var(--text-secondary);font-size:1.1rem;margin-bottom:2.5rem;max-width:500px;margin-left:auto;margin-right:auto}
.btn-cta{display:inline-flex;align-items:center;gap:0.75rem;background:transparent;border:1.5px solid var(--primary);color:var(--primary);font-weight:700;font-size:1.1rem;padding:1rem 2.5rem;border-radius:12px;text-decoration:none;transition:all 0.25s;letter-spacing:-0.01em}
.btn-cta:hover{background:var(--primary-dim);box-shadow:0 0 40px var(--primary-glow);transform:translateY(-2px)}

/* FOOTER */
footer{padding:2rem;text-align:center;border-top:1px solid var(--border-subtle);font-size:0.8rem;color:var(--text-muted)}

/* FADE IN */
.fade-in{opacity:0;transform:translateY(24px);transition:opacity 0.6s ease,transform 0.6s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}

/* THREE-LAYER MODEL */
#three-layer{background:var(--bg-alt)}
.layers-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:0;margin-top:3rem;position:relative}
.layers-grid::before{content:'';position:absolute;top:50%;left:calc(33.33% - 1px);right:calc(33.33% - 1px);height:2px;background:linear-gradient(90deg,var(--primary),var(--accent),var(--primary));z-index:0;transform:translateY(-50%)}
.layer-card{background:var(--bg-card);border:1px solid var(--border-subtle);padding:2.5rem 2rem;position:relative;z-index:1;transition:border-color 0.25s}
.layer-card:first-child{border-radius:16px 0 0 16px}
.layer-card:last-child{border-radius:0 16px 16px 0}
.layer-card:hover{border-color:var(--border)}
.layer-num{font-size:0.7rem;font-weight:800;letter-spacing:0.2em;text-transform:uppercase;color:var(--primary);margin-bottom:0.75rem}
.layer-icon{font-size:2rem;margin-bottom:1rem}
.layer-card h3{font-size:1.1rem;font-weight:700;margin-bottom:0.75rem}
.layer-card p{font-size:0.875rem;color:var(--text-secondary);line-height:1.6;margin-bottom:0.75rem}
.layer-card ul{list-style:none;padding:0}
.layer-card ul li{font-size:0.8rem;color:var(--text-muted);padding:0.2rem 0;display:flex;align-items:center;gap:0.5rem}
.layer-card ul li::before{content:'→';color:var(--primary);font-size:0.75rem}
.layer-end{font-size:0.75rem;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;color:var(--accent);margin-top:1rem}

/* TRAJECTORY */
#trajectory{background:var(--bg)}
.traj-arc{margin-top:3rem;position:relative;padding:2rem 0}
.traj-svg-wrap{width:100%;overflow:hidden;margin-bottom:3rem}
.traj-phases{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem;margin-top:2rem}
.traj-phase{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:16px;padding:2rem;position:relative}
.traj-phase-num{font-size:0.7rem;font-weight:800;letter-spacing:0.2em;text-transform:uppercase;color:var(--text-muted);margin-bottom:0.5rem}
.traj-phase h4{font-size:1rem;font-weight:700;margin-bottom:1rem;color:var(--primary)}
.traj-phase ul{list-style:none;padding:0}
.traj-phase ul li{font-size:0.8rem;color:var(--text-secondary);padding:0.25rem 0;display:flex;align-items:flex-start;gap:0.5rem;line-height:1.4}
.traj-phase ul li::before{content:'·';color:var(--accent);font-weight:900;flex-shrink:0}
.traj-phase:last-child{border-color:var(--border);background:var(--primary-dim)}
.traj-phase:last-child h4{color:var(--accent)}

/* MANIFESTO */
#manifesto{background:var(--bg-alt);text-align:center}
.manifesto-quote{font-size:clamp(1.3rem,3vw,2rem);font-weight:700;line-height:1.5;letter-spacing:-0.02em;max-width:800px;margin:0 auto 2rem;color:var(--text)}
.manifesto-quote em{font-style:normal;color:var(--primary)}
.manifesto-sub{font-size:1rem;color:var(--text-secondary);max-width:600px;margin:0 auto}

/* TEAM STORY */
.team-story{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:20px;padding:2.5rem;margin-bottom:3rem;max-width:800px}
.team-story p{font-size:1rem;color:var(--text-secondary);line-height:1.8;margin-bottom:1rem}
.team-story p:last-child{margin-bottom:0}
.team-story strong{color:var(--text)}

/* COUNTER ANIMATION */
.stat-number.counting{color:var(--primary)}

/* RESPONSIVE */
@media(max-width:900px){
  .nav-links{display:none}
  .hamburger{display:flex}
  .problem-grid,.pqrs-grid,.sectors-grid,.stats-grid,.timeline,.partnership-grid,.team-grid,.traj-phases,.layers-grid{grid-template-columns:1fr}
  .layers-grid::before{display:none}
  .layer-card:first-child,.layer-card:last-child{border-radius:12px}
  .layer-card{border-radius:12px}
  .phases{grid-template-columns:1fr;gap:0.75rem}
  .phase-arrow{transform:rotate(90deg)}
  .comparison-table{font-size:0.8rem}
  .comparison-table th,.comparison-table td{padding:0.75rem 0.9rem}
}
@media(max-width:640px){
  section{padding:4rem 0}
  .container{padding:0 1.25rem}
  .hero-h1{font-size:2.4rem}
  .stat-number{font-size:2.2rem}
}