/* ═══════════════════════════════════════════════
   DELF LANDING — PREMIUM DARK THEME
   ═══════════════════════════════════════════════ */

:root{
  --black:#0b0d12;
  --surface:#111318;
  --surface2:#161922;
  --border:rgba(255,255,255,0.06);
  --border-bright:rgba(255,255,255,0.12);
  --white:#f0f1f5;
  --muted:#6b6f80;
  --cyan:#00d4ff;
  --green:#00ff88;
  --yellow:#f5c400;
  --red:#ff4d6a;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;}
body{background:var(--black);color:var(--white);font-family:'DM Sans',sans-serif;font-weight:400;overflow-x:hidden;}

/* Noise overlay */
body::after{content:'';position:fixed;inset:0;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");pointer-events:none;z-index:9999;opacity:0.3;}

/* ═══ NAV ═══ */
nav{position:fixed;top:0;left:0;right:0;z-index:100;display:flex;align-items:center;justify-content:space-between;padding:0 40px;height:60px;transition:all 0.3s;}
nav.scrolled{background:rgba(11,13,18,0.95);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);}
.nav-left{display:flex;align-items:center;gap:10px;}
.nav-logo-img{width:36px;height:36px;object-fit:cover;border-radius:5px;}
.nav-logo{font-family:'Syne',sans-serif;font-weight:800;font-size:20px;color:var(--white);text-decoration:none;letter-spacing:-0.5px;}
.nav-logo span{color:var(--cyan);}
.nav-right{display:flex;align-items:center;gap:24px;}
.nav-link{font-size:13px;color:var(--muted);text-decoration:none;transition:color 0.2s;font-weight:400;}
.nav-link:hover{color:var(--white);}
.btn-nav{font-size:11px;letter-spacing:1.5px;text-transform:uppercase;color:var(--cyan);border:1px solid rgba(0,212,255,0.30);padding:7px 20px;text-decoration:none;border-radius:3px;transition:all 0.2s;font-weight:500;}
.btn-nav:hover{background:rgba(0,212,255,0.08);border-color:var(--cyan);}

/* ═══ HERO ═══ */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;padding:80px 40px 40px;overflow:hidden;}
.hero-glow{position:absolute;top:-200px;right:-200px;width:700px;height:700px;background:radial-gradient(circle,rgba(0,212,255,0.06) 0%,transparent 70%);pointer-events:none;}
.hero-content{max-width:1200px;margin:0 auto;width:100%;display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;}
.hero-tag{font-size:10px;letter-spacing:3px;text-transform:uppercase;color:var(--cyan);font-weight:500;margin-bottom:16px;}
.hero-title{font-family:'Syne',sans-serif;font-weight:800;font-size:52px;line-height:1.1;letter-spacing:-1px;color:var(--white);margin-bottom:20px;}
.hero-title span{color:var(--cyan);}
.hero-sub{font-size:16px;font-weight:300;color:var(--muted);line-height:1.7;max-width:460px;margin-bottom:28px;}
.hero-ctas{display:flex;gap:12px;margin-bottom:40px;}
.btn-primary{display:inline-flex;align-items:center;font-family:'DM Sans',sans-serif;font-size:13px;font-weight:500;letter-spacing:0.5px;color:var(--black);background:var(--cyan);padding:12px 28px;text-decoration:none;border-radius:4px;transition:all 0.2s;border:none;cursor:pointer;}
.btn-primary:hover{background:#33ddff;transform:translateY(-1px);box-shadow:0 4px 20px rgba(0,212,255,0.25);}
.btn-large{font-size:15px;padding:14px 36px;}
.btn-ghost{display:inline-flex;align-items:center;font-family:'DM Sans',sans-serif;font-size:13px;font-weight:400;color:var(--muted);padding:12px 20px;text-decoration:none;border:1px solid var(--border);border-radius:4px;transition:all 0.2s;}
.btn-ghost:hover{color:var(--white);border-color:var(--border-bright);}
.btn-outline{display:inline-flex;align-items:center;font-family:'DM Sans',sans-serif;font-size:13px;font-weight:400;color:var(--white);padding:12px 28px;text-decoration:none;border:1px solid var(--border-bright);border-radius:4px;transition:all 0.2s;}
.btn-outline:hover{border-color:var(--cyan);color:var(--cyan);}

/* Hero proof */
.hero-proof{display:flex;gap:24px;align-items:center;}
.proof-item{display:flex;gap:10px;align-items:center;}
.proof-num{font-family:'Syne',sans-serif;font-weight:800;font-size:28px;color:var(--cyan);}
.proof-label{font-size:11px;color:var(--muted);font-weight:300;line-height:1.4;}
.proof-divider{width:1px;height:36px;background:var(--border-bright);}

/* Hero Demo Card */
.hero-demo{background:var(--surface);border:1px solid var(--border);border-radius:8px;overflow:hidden;box-shadow:0 20px 60px rgba(0,0,0,0.4);animation:float 6s ease-in-out infinite;}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
.demo-header{display:flex;align-items:center;gap:12px;padding:12px 16px;border-bottom:1px solid var(--border);background:rgba(0,0,0,0.3);}
.demo-dots{display:flex;gap:5px;}
.demo-dots span{width:8px;height:8px;border-radius:50%;background:var(--border-bright);}
.demo-dots span:first-child{background:var(--red);}
.demo-dots span:nth-child(2){background:var(--yellow);}
.demo-dots span:nth-child(3){background:var(--green);}
.demo-title{font-size:11px;color:var(--muted);letter-spacing:1px;font-weight:400;}
.demo-body{padding:16px;}
.demo-section{margin-bottom:12px;}
.demo-label{font-size:9px;letter-spacing:2px;text-transform:uppercase;color:var(--muted);font-weight:500;margin-bottom:8px;}
.demo-row{display:flex;justify-content:space-between;padding:5px 0;border-bottom:1px solid var(--border);font-size:12px;}
.demo-key{color:var(--muted);font-weight:300;}
.demo-val{color:var(--white);font-weight:400;}
.demo-divider{height:1px;background:var(--border-bright);margin:12px 0;}
.demo-insight{display:flex;gap:10px;padding:8px 0;align-items:flex-start;}
.demo-insight-icon{font-size:14px;flex-shrink:0;margin-top:1px;}
.demo-insight-text{font-size:11px;color:#a8aab5;font-weight:300;line-height:1.5;}

/* ═══ SECTIONS ═══ */
.section{padding:100px 40px;}
.section-dark{background:var(--surface);}
.wrap{max-width:1100px;margin:0 auto;}
.section-header{margin-bottom:48px;}
.label{font-size:10px;letter-spacing:3px;text-transform:uppercase;color:var(--cyan);font-weight:500;margin-bottom:12px;}
.h2{font-family:'Syne',sans-serif;font-weight:800;font-size:36px;line-height:1.2;letter-spacing:-0.5px;color:var(--white);margin-bottom:12px;}
.section-sub{font-size:15px;font-weight:300;color:var(--muted);line-height:1.6;max-width:500px;}

/* Phases */
.phases{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;}
.phase{position:relative;background:var(--surface);border:1px solid var(--border);border-radius:6px;padding:28px 22px;overflow:hidden;transition:all 0.3s;}
.phase:hover{border-color:var(--border-bright);transform:translateY(-3px);}
.phase:hover .phase-glow{opacity:1;}
.phase-glow{position:absolute;top:-40px;right:-40px;width:120px;height:120px;background:radial-gradient(circle,rgba(0,212,255,0.08) 0%,transparent 70%);opacity:0;transition:opacity 0.3s;}
.phase-num{font-family:'Syne',sans-serif;font-weight:800;font-size:32px;color:rgba(0,212,255,0.15);margin-bottom:12px;}
.phase-badge{display:inline-block;font-size:9px;letter-spacing:1.5px;text-transform:uppercase;color:var(--cyan);border:1px solid rgba(0,212,255,0.20);padding:3px 10px;border-radius:2px;margin-bottom:12px;font-weight:500;}
.phase-name{font-family:'Syne',sans-serif;font-weight:700;font-size:16px;color:var(--white);margin-bottom:8px;}
.phase-desc{font-size:12px;font-weight:300;color:var(--muted);line-height:1.6;}

/* Live Demo */
.live-demo{display:grid;grid-template-columns:1fr 1fr;gap:20px;background:var(--black);border:1px solid var(--border);border-radius:8px;overflow:hidden;}
.live-left,.live-right{padding:24px;}
.live-left{border-right:1px solid var(--border);}
.live-label{font-size:9px;letter-spacing:2px;text-transform:uppercase;color:var(--muted);font-weight:500;margin-bottom:14px;}
.live-line{font-size:12px;font-weight:300;color:#a8aab5;line-height:1.6;padding:10px 0;border-bottom:1px solid var(--border);}
.speaker{display:inline-block;font-size:9px;letter-spacing:1px;text-transform:uppercase;padding:2px 8px;border-radius:2px;margin-right:8px;font-weight:500;}
.speaker.you{background:rgba(0,212,255,0.10);color:var(--cyan);}
.speaker.them{background:rgba(255,77,106,0.10);color:var(--red);}
.live-card{font-size:12px;font-weight:300;color:#b8bac5;line-height:1.5;padding:12px 14px;border-radius:4px;margin-bottom:8px;border-left:3px solid;}
.live-card-tag{font-size:8px;letter-spacing:1.5px;text-transform:uppercase;font-weight:600;margin-bottom:4px;}
.live-card-green{background:rgba(0,255,136,0.04);border-color:var(--green);}
.live-card-green .live-card-tag{color:var(--green);}
.live-card-yellow{background:rgba(245,196,0,0.04);border-color:var(--yellow);}
.live-card-yellow .live-card-tag{color:var(--yellow);}
.live-card-red{background:rgba(255,77,106,0.04);border-color:var(--red);}
.live-card-red .live-card-tag{color:var(--red);}

/* Two columns */
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
.col-card{background:var(--surface);border:1px solid var(--border);border-radius:6px;padding:28px 24px;transition:border-color 0.3s;}
.col-card:hover{border-color:var(--border-bright);}
.col-card-icon{font-size:28px;margin-bottom:16px;}
.col-card-title{font-family:'Syne',sans-serif;font-weight:700;font-size:18px;color:var(--white);margin-bottom:4px;}
.col-card-sub{font-size:12px;color:var(--muted);font-weight:300;margin-bottom:20px;}
.col-card-list{display:flex;flex-direction:column;gap:10px;}
.col-card-item{font-size:12px;font-weight:300;color:#a8aab5;line-height:1.5;padding-left:16px;position:relative;}
.col-card-item::before{content:'›';position:absolute;left:0;color:var(--cyan);font-weight:700;}

/* Books */
.books{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;}
.book{background:var(--black);border:1px solid var(--border);border-radius:6px;padding:24px 20px;transition:all 0.3s;}
.book:hover{border-color:rgba(0,212,255,0.20);transform:translateY(-2px);}
.book-source{font-size:9px;letter-spacing:1.5px;text-transform:uppercase;color:var(--cyan);font-weight:500;margin-bottom:10px;}
.book-title{font-family:'Syne',sans-serif;font-weight:700;font-size:15px;color:var(--white);margin-bottom:6px;line-height:1.3;}
.book-author{font-size:12px;color:var(--muted);font-weight:300;}

/* Learning Loop */
.learn-loop{display:flex;align-items:flex-start;gap:16px;justify-content:center;}
.learn-step{flex:1;max-width:280px;background:var(--black);border:1px solid var(--border);border-radius:6px;padding:28px 22px;text-align:center;transition:all 0.3s;}
.learn-step:hover{border-color:rgba(0,212,255,0.25);transform:translateY(-3px);}
.learn-num{font-family:'Syne',sans-serif;font-weight:800;font-size:28px;color:var(--cyan);margin-bottom:10px;}
.learn-title{font-family:'Syne',sans-serif;font-weight:700;font-size:15px;color:var(--white);margin-bottom:8px;}
.learn-desc{font-size:12px;font-weight:300;color:var(--muted);line-height:1.6;}
.learn-arrow{font-size:24px;color:rgba(0,212,255,0.30);padding-top:40px;font-weight:300;}

/* Differentiators */
.diff-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.diff-card{background:var(--surface);border:1px solid var(--border);border-radius:6px;padding:28px 24px;transition:all 0.3s;}
.diff-card:hover{border-color:var(--border-bright);transform:translateY(-2px);}
.diff-icon{font-size:28px;margin-bottom:14px;}
.diff-title{font-family:'Syne',sans-serif;font-weight:700;font-size:16px;color:var(--white);margin-bottom:8px;}
.diff-desc{font-size:12px;font-weight:300;color:var(--muted);line-height:1.7;}

/* CTA */
.cta-section{background:var(--black);}
.cta-inner{position:relative;text-align:center;padding:60px 40px;background:var(--surface);border:1px solid var(--border);border-radius:12px;overflow:hidden;}
.cta-glow{position:absolute;top:-100px;left:50%;transform:translateX(-50%);width:500px;height:300px;background:radial-gradient(ellipse,rgba(0,212,255,0.08) 0%,transparent 70%);pointer-events:none;}
.cta-buttons{display:flex;gap:14px;justify-content:center;margin-top:28px;}

/* Footer */
footer{border-top:1px solid var(--border);padding:24px 40px;}
.footer-inner{max-width:1100px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;}
.footer-brand{display:flex;align-items:center;gap:10px;}
.footer-logo-img{width:22px;height:22px;object-fit:cover;border-radius:3px;}
.footer-logo{font-family:'Syne',sans-serif;font-weight:800;font-size:15px;color:var(--white);}
.footer-logo span{color:var(--cyan);}
.footer-copy{font-size:11px;color:var(--muted);font-weight:300;}

/* ═══ SCROLL REVEAL ═══ */
.reveal{opacity:0;transform:translateY(24px);transition:opacity 0.7s ease,transform 0.7s ease;}
.reveal.visible{opacity:1;transform:translateY(0);}

/* ═══ RESPONSIVE ═══ */
@media(max-width:900px){
  .hero-content{grid-template-columns:1fr;gap:40px;}
  .hero-title{font-size:38px;}
  .hero-right{order:1;}
  .phases{grid-template-columns:1fr 1fr;}
  .live-demo{grid-template-columns:1fr;}
  .live-left{border-right:none;border-bottom:1px solid var(--border);}
  .two-col{grid-template-columns:1fr;}
  .books{grid-template-columns:1fr 1fr;}
  .hero-proof{flex-wrap:wrap;}
  .learn-loop{flex-direction:column;align-items:center;}
  .learn-arrow{transform:rotate(90deg);padding:0;}
  .diff-grid{grid-template-columns:1fr;}
}
@media(max-width:600px){
  /* Hero */
  .hero{padding:100px 20px 40px;min-height:auto;}
  .hero-glow{display:none;}
  .hero-demo{animation:none;}
  .hero-title{font-size:28px;letter-spacing:-0.5px;}
  .hero-sub{font-size:14px;margin-bottom:20px;}
  .hero-ctas{flex-direction:column;gap:10px;}
  .btn-primary{text-align:center;justify-content:center;width:100%;}
  .btn-ghost{text-align:center;justify-content:center;width:100%;}
  .hero-proof{gap:12px;flex-direction:column;align-items:flex-start;}
  .proof-item{gap:8px;}
  .proof-num{font-size:22px;}
  .proof-label{font-size:10px;}
  .proof-divider{display:none;}

  /* Nav */
  nav{padding:0 16px;height:54px;}
  .nav-right .nav-link{display:none;}
  .nav-logo{font-size:17px;}
  .nav-logo-img{width:30px;height:30px;}
  .btn-nav{font-size:10px;padding:6px 16px;}

  /* Sections */
  .section{padding:60px 20px;}
  .section-header{margin-bottom:32px;}
  .h2{font-size:24px;}
  .section-sub{font-size:13px;}
  .phases{grid-template-columns:1fr;}
  .phase{padding:22px 18px;}
  .books{grid-template-columns:1fr;}

  /* Cards & Components */
  .col-card{padding:22px 18px;}
  .col-card-title{font-size:16px;}
  .diff-card{padding:22px 18px;}
  .learn-step{padding:22px 18px;}

  /* CTA */
  .cta-inner{padding:40px 24px;}
  .cta-buttons{flex-direction:column;align-items:center;width:100%;}
  .cta-buttons .btn-primary,.cta-buttons .btn-outline{width:100%;text-align:center;justify-content:center;}

  /* Footer */
  .footer-inner{flex-direction:column;gap:10px;text-align:center;}
  .footer-copy{font-size:10px;}
}