:root{
  --bg:#0b0f1a;
  --bg-2:#0f1525;
  --panel:#121a2e;
  --panel-2:#172041;
  --border:rgba(255,255,255,.08);
  --text:#e8ecf6;
  --muted:#9aa3b8;
  --primary:#7c5cff;
  --primary-2:#22d3ee;
  --accent:#f59e0b;
  --whatsapp:#25d366;
  --radius:16px;
  --radius-lg:22px;
  --shadow: 0 20px 60px -20px rgba(0,0,0,.6), 0 1px 0 rgba(255,255,255,.04) inset;
  --grad: linear-gradient(135deg,#7c5cff 0%,#22d3ee 60%,#f59e0b 110%);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:'Inter',system-ui,-apple-system,sans-serif;
  background:radial-gradient(1200px 800px at 80% -10%, rgba(124,92,255,.18), transparent 60%),
             radial-gradient(900px 700px at -10% 20%, rgba(34,211,238,.12), transparent 60%),
             var(--bg);
  color:var(--text);
  -webkit-font-smoothing:antialiased;
  line-height:1.55;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3{font-family:'Space Grotesk','Inter',sans-serif;letter-spacing:-.02em;line-height:1.1;margin:0}
h1{font-size:clamp(2.2rem,5vw,4rem);font-weight:700}
h2{font-size:clamp(1.6rem,3vw,2.4rem);font-weight:700}
p{margin:0}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* NAV */
.nav{
  position:sticky;top:0;z-index:50;
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 28px;
  backdrop-filter:saturate(140%) blur(14px);
  background:rgba(11,15,26,.65);
  border-bottom:1px solid var(--border);
}
.brand{display:flex;align-items:center;gap:12px}
.brand-text{display:flex;flex-direction:column;line-height:1}
.brand-name{font-family:'Space Grotesk';font-weight:700;font-size:1.1rem;letter-spacing:.04em}
.brand-sub{font-size:.72rem;color:var(--muted);letter-spacing:.18em;text-transform:uppercase;margin-top:3px}
.nav-links{display:flex;align-items:center;gap:22px}
.nav-links a{color:var(--muted);font-weight:500;font-size:.95rem;transition:color .2s}
.nav-links a:hover{color:var(--text)}
@media (max-width:780px){
  .nav-links a:not(.btn){display:none}
  .nav{padding:12px 16px}
}

/* BUTTONS */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 18px;border-radius:999px;
  font-weight:600;font-size:.92rem;
  border:1px solid transparent;cursor:pointer;
  transition:transform .15s ease, box-shadow .2s ease, background .2s, border-color .2s;
  font-family:inherit;
}
.btn:active{transform:translateY(1px)}
.btn-primary{
  background:var(--grad);color:#0b0f1a;
  box-shadow:0 10px 30px -10px rgba(124,92,255,.6);
}
.btn-primary:hover{box-shadow:0 14px 36px -10px rgba(124,92,255,.8)}
.btn-ghost{background:rgba(255,255,255,.04);border-color:var(--border);color:var(--text)}
.btn-ghost:hover{background:rgba(255,255,255,.08)}
.btn-whatsapp{background:var(--whatsapp);color:#06281a}
.btn-whatsapp:hover{filter:brightness(1.05)}

/* HERO */
.hero{position:relative;padding:80px 28px 60px;text-align:center;overflow:hidden}
.hero-bg{
  position:absolute;inset:-20% -10% auto -10%;height:120%;
  background:
    radial-gradient(600px 380px at 50% 0%, rgba(124,92,255,.35), transparent 60%),
    radial-gradient(500px 320px at 20% 30%, rgba(34,211,238,.22), transparent 60%),
    radial-gradient(500px 320px at 80% 30%, rgba(245,158,11,.18), transparent 60%);
  filter:blur(20px);z-index:-1;
}
.hero-inner{max-width:920px;margin:0 auto}
.eyebrow{
  display:inline-block;font-size:.78rem;letter-spacing:.22em;
  text-transform:uppercase;color:var(--muted);
  padding:6px 14px;border:1px solid var(--border);border-radius:999px;
  background:rgba(255,255,255,.03);margin-bottom:22px;
}
.lead{color:var(--muted);font-size:clamp(1rem,1.4vw,1.15rem);margin:18px auto 28px;max-width:720px}
.hero-cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.hero-stats{
  list-style:none;padding:0;margin:50px 0 0;
  display:grid;grid-template-columns:repeat(4,1fr);gap:14px;max-width:720px;margin-inline:auto;
}
.hero-stats li{
  background:rgba(255,255,255,.03);border:1px solid var(--border);
  border-radius:var(--radius);padding:18px 10px;
}
.hero-stats strong{display:block;font-family:'Space Grotesk';font-size:1.6rem;background:var(--grad);-webkit-background-clip:text;color:transparent}
.hero-stats span{font-size:.78rem;color:var(--muted);letter-spacing:.12em;text-transform:uppercase}
@media (max-width:600px){.hero-stats{grid-template-columns:repeat(2,1fr)}}

/* SECTION */
.section-head{text-align:center;max-width:720px;margin:0 auto 36px;padding:0 16px}
.section-head p{color:var(--muted);margin-top:10px}
section{padding:80px 0}
.tool, .backgrounds, .video-section, .about{padding-inline:28px}

/* TOOL */
.tool-grid{
  max-width:1100px;margin:0 auto;
  display:grid;grid-template-columns:1fr;gap:24px;
}
@media(min-width:900px){.tool-grid{grid-template-columns:1fr 1fr}}

.dropzone{
  background:linear-gradient(180deg,var(--panel),var(--panel-2));
  border:1.5px dashed rgba(124,92,255,.4);
  border-radius:var(--radius-lg);
  min-height:420px;display:flex;align-items:center;justify-content:center;
  padding:30px;text-align:center;cursor:pointer;
  transition:border-color .2s, background .2s;
  box-shadow:var(--shadow);
}
.dropzone.dragover{border-color:var(--primary);background:linear-gradient(180deg,#1a2347,#1f2a55)}
.dz-inner h3{margin-bottom:8px;font-size:1.25rem}
.dz-inner p{color:var(--muted);margin-bottom:20px;font-size:.9rem}
.dz-icon{
  width:72px;height:72px;border-radius:50%;
  background:rgba(124,92,255,.15);color:var(--primary-2);
  display:flex;align-items:center;justify-content:center;margin:0 auto 18px;
}
.dz-progress{width:100%;max-width:380px}
.spinner{
  width:42px;height:42px;border-radius:50%;
  border:3px solid rgba(255,255,255,.1);border-top-color:var(--primary-2);
  margin:0 auto 16px;animation:spin 1s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg)}}
.bar{height:8px;background:rgba(255,255,255,.06);border-radius:999px;overflow:hidden;margin-top:14px}
.bar>span{display:block;height:100%;width:0%;background:var(--grad);transition:width .3s}

/* PREVIEW */
.preview{
  background:linear-gradient(180deg,var(--panel),var(--panel-2));
  border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:18px;display:flex;flex-direction:column;gap:16px;box-shadow:var(--shadow);
}
.preview-canvas{
  border-radius:var(--radius);overflow:hidden;
  min-height:300px;display:flex;align-items:center;justify-content:center;
  background:#0a0d18;position:relative;
}
.checker{
  background-image:
    linear-gradient(45deg,#1c2540 25%,transparent 25%),
    linear-gradient(-45deg,#1c2540 25%,transparent 25%),
    linear-gradient(45deg,transparent 75%,#1c2540 75%),
    linear-gradient(-45deg,transparent 75%,#1c2540 75%);
  background-size:24px 24px;
  background-position:0 0,0 12px,12px -12px,-12px 0;
  background-color:#0f1428;
}
.preview-canvas img{max-height:420px;width:auto;object-fit:contain}
.preview-canvas.has-bg{background-size:cover;background-position:center}
.action-group label{display:block;font-size:.78rem;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin-bottom:8px}
.seg{display:flex;background:rgba(255,255,255,.04);border:1px solid var(--border);border-radius:12px;padding:4px;gap:4px}
.seg-btn{
  flex:1;padding:10px 8px;border:0;background:transparent;color:var(--muted);
  border-radius:9px;cursor:pointer;font-family:inherit;font-weight:600;font-size:.82rem;
  display:flex;flex-direction:column;align-items:center;gap:2px;transition:.2s;
}
.seg-btn span{font-size:.65rem;font-weight:500;opacity:.8;letter-spacing:.05em}
.seg-btn.active{background:var(--grad);color:#0b0f1a}
.btn-row{display:flex;gap:10px;flex-wrap:wrap}
.btn-row .btn{flex:1;justify-content:center;min-width:140px}
.hint{font-size:.82rem;color:var(--muted);text-align:center;margin-top:4px}

/* BACKGROUNDS */
.bg-tabs{
  display:flex;flex-wrap:wrap;gap:8px;justify-content:center;
  max-width:1100px;margin:0 auto 24px;padding:0 16px;
}
.bg-tab{
  padding:8px 16px;border-radius:999px;border:1px solid var(--border);
  background:rgba(255,255,255,.03);color:var(--muted);cursor:pointer;
  font-family:inherit;font-weight:500;font-size:.85rem;transition:.2s;
}
.bg-tab:hover{color:var(--text);border-color:rgba(124,92,255,.4)}
.bg-tab.active{background:var(--grad);color:#0b0f1a;border-color:transparent;font-weight:600}
.bg-grid{
  max-width:1200px;margin:0 auto;padding:0 16px;
  display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:14px;
}
.bg-card{
  position:relative;aspect-ratio:1;border-radius:14px;overflow:hidden;cursor:pointer;
  border:1.5px solid transparent;transition:transform .2s, border-color .2s;
  background:#1a2240;
}
.bg-card img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.bg-card:hover{transform:translateY(-3px);border-color:var(--primary)}
.bg-card:hover img{transform:scale(1.08)}
.bg-card.selected{border-color:var(--primary-2);box-shadow:0 0 0 3px rgba(34,211,238,.25)}
.bg-card.none{display:flex;align-items:center;justify-content:center;background:#0f1428;color:var(--muted);font-size:.8rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase}
.bg-more{text-align:center;margin-top:28px}

/* VIDEO */
.video-section{text-align:center}
.badge{
  display:inline-block;font-size:.7rem;letter-spacing:.16em;text-transform:uppercase;
  background:var(--grad);color:#0b0f1a;padding:4px 10px;border-radius:999px;
  vertical-align:middle;margin-left:8px;font-family:'Inter';font-weight:700;
}
.video-cta{margin-top:24px}

/* ABOUT */
.about{padding-bottom:100px}
.about-inner{
  max-width:1100px;margin:0 auto;
  display:grid;grid-template-columns:1fr;gap:30px;align-items:center;
  background:linear-gradient(180deg,var(--panel),var(--panel-2));
  border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:40px;box-shadow:var(--shadow);
}
@media(min-width:820px){.about-inner{grid-template-columns:1.4fr 1fr;padding:56px}}
.about-inner h2{margin:8px 0 14px}
.about-inner p{color:var(--muted);margin-bottom:22px}
.about-card{
  background:var(--grad);border-radius:var(--radius);padding:40px;text-align:center;color:#0b0f1a;
}
.zhh-mark{font-family:'Space Grotesk';font-weight:700;font-size:3rem;letter-spacing:.05em}

/* FOOTER */
.footer{border-top:1px solid var(--border);padding:30px 28px;background:rgba(0,0,0,.2)}
.foot-inner{
  max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:14px;
  color:var(--muted);font-size:.88rem;
}
.foot-inner a{color:var(--primary-2)}

/* TOAST */
.toast{
  position:fixed;bottom:24px;left:50%;transform:translateX(-50%);
  background:#1a2347;border:1px solid var(--border);color:var(--text);
  padding:12px 20px;border-radius:12px;z-index:100;
  box-shadow:var(--shadow);font-size:.9rem;
  animation:toast .3s ease;
}
@keyframes toast{from{opacity:0;transform:translate(-50%,10px)}to{opacity:1;transform:translate(-50%,0)}}