:root{
  --bg:#ffffff;
  --text:#1a1c20;
  --muted:#6b7380;
  --border:#eef1f5;
  --card:#ffffff;
  --primary:#7c4dff;
  --primary-weak:#efe3ff;
  --secondary:#40a9ff;
}

html[data-theme="dark"]{
  --bg:#0f1115;
  --text:#e6e8ec;
  --muted:#a0a7b4;
  --border:#23262d;
  --card:#171a1f;
  --primary:#9b6bff;
  --primary-weak:#2a1f3f;
  --secondary:#5fbaff;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Apple SD Gothic Neo,Noto Sans,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text)}
.container{max-width:1080px;margin:0 auto;padding:0 20px}
.site-header{position:sticky;top:0;background:var(--bg);border-bottom:1px solid var(--border);z-index:20;backdrop-filter:saturate(180%) blur(8px)}
.site-header{position:sticky;top:0}
.site-header .nav{flex-wrap:nowrap}
.site-header .nav a,.site-header .nav button{white-space:nowrap}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:12px}
.logo{width:40px;height:40px;border-radius:10px}
.titles .app-name{margin:0;font-size:20px;letter-spacing:-0.2px}
.titles .tagline{margin:0;font-size:12px;color:var(--muted)}
.nav{display:flex;align-items:center;gap:12px}
.nav a{margin-left:0.25rem;text-decoration:none;color:inherit;font-weight:600;opacity:.9}
.nav a:hover{opacity:1}
.theme-toggle{margin-left:8px;display:inline-flex;align-items:center;gap:6px;padding:8px 10px;border:1px solid var(--border);border-radius:10px;background:transparent;color:inherit;cursor:pointer}
.theme-toggle .icon-moon{display:none}
html[data-theme="dark"] .theme-toggle .icon-sun{display:none}
html[data-theme="dark"] .theme-toggle .icon-moon{display:inline}
.feedback{color:var(--primary)}
.lang-toggle{margin-left:4px;border:1px solid var(--border);background:transparent;color:inherit;border-radius:10px;padding:8px 10px;cursor:pointer}

/* Mobile nav (hamburger) */
.menu-toggle{display:none;margin-left:8px;border:1px solid var(--border);background:transparent;color:inherit;border-radius:10px;padding:8px 10px;cursor:pointer}
.mobile-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.35);backdrop-filter:saturate(150%) blur(2px);opacity:0;pointer-events:none;transition:opacity .2s ease;z-index:90}
.mobile-menu{position:fixed;top:0;right:0;bottom:0;width:78%;max-width:360px;background:var(--bg);border-left:1px solid var(--border);transform:translateX(100%);transition:transform .25s ease;z-index:91;display:flex;flex-direction:column;padding:16px}
.mobile-menu .menu-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.mobile-menu .menu-list{display:flex;flex-direction:column;gap:8px;overflow:auto;padding:8px 2px}
.mobile-menu a{padding:12px;border-radius:12px;text-decoration:none;color:inherit;border:1px solid var(--border);background:var(--card)}
.mobile-menu .menu-actions{margin-top:auto;display:flex;gap:8px}
.mobile-open .mobile-backdrop{opacity:1;pointer-events:auto}
.mobile-open .mobile-menu{transform:translateX(0)}
body.mobile-open{overflow:hidden}

@media (max-width: 720px){
  .menu-toggle{display:inline-flex}
  .nav > a, .nav > .feedback{display:none}
}

.hero{position:relative;background:radial-gradient(1200px 300px at 50% -80%, var(--primary-weak), transparent), linear-gradient(135deg,#f7f2ff,#eaf6ff 60%,#f6f0ff)}
html[data-theme="dark"] .hero{background:radial-gradient(1200px 300px at 50% -80%, #1d1430, transparent), linear-gradient(135deg,#0f1115,#0f141a)}
.hero-inner{display:grid;grid-template-columns:1.1fr .9fr;align-items:center;min-height:520px;padding:80px 0;gap:28px}
.decor.gradient{position:absolute;inset:-60px -10% 0 -10%;pointer-events:none;filter:blur(30px);opacity:.6;background:
  radial-gradient(420px 260px at 20% 20%, var(--primary-weak), transparent 60%),
  radial-gradient(380px 220px at 80% 30%, rgba(64,169,255,.25), transparent 60%),
  radial-gradient(300px 200px at 50% 80%, rgba(124,77,255,.25), transparent 60%);
}
.hero-canvas{position:absolute;inset:0;pointer-events:none}
@media (max-width: 720px){.hero-canvas{display:none}}
.hero .copy h2{margin:0 0 12px;font-size:40px;letter-spacing:-0.3px;line-height:1.15;background:linear-gradient(92deg, #7c4dff 0%, #40a9ff 55%, #9b6bff 100%);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lead{margin:0 0 10px;color:var(--muted)}
.bullets{margin:8px 0 20px;padding-left:18px}
.bullets li{margin:6px 0}
.cta-group{display:flex;gap:8px;align-items:center}
.btn{display:inline-block;padding:12px 16px;border-radius:14px;border:1px solid var(--border);text-decoration:none;color:inherit;background:var(--card);transition:transform .15s ease, box-shadow .2s ease, background .2s ease}
.btn:hover{transform:translateY(-1px);box-shadow:0 8px 24px rgba(0,0,0,.08)}
.btn.primary{background:var(--primary);color:#fff;border-color:transparent;box-shadow:0 10px 30px rgba(124,77,255,.35)}
.btn.primary:hover{box-shadow:0 14px 36px rgba(124,77,255,.5), 0 0 0 3px rgba(124,77,255,.15)}
.chip{display:inline-block;border:1px solid var(--border);padding:6px 10px;border-radius:999px;font-size:12px;color:var(--muted)}
.badges{display:flex;gap:8px;margin-top:10px;flex-wrap:wrap}

.visual{display:flex;justify-content:center}
.emotion-stack{position:relative;perspective:1000px;display:grid;gap:10px;grid-template-columns:repeat(2, 1fr)}
.emotion-card{position:relative;background:var(--card);border:1px solid var(--border);border-radius:16px;padding:14px 16px;font-weight:700;box-shadow:0 12px 30px rgba(0,0,0,.08);transform:translateZ(0);transition:transform .12s ease, box-shadow .2s ease}
.emotion-card:hover{transform:translateY(-2px) scale(1.01);box-shadow:0 12px 28px rgba(0,0,0,.12)}
.emotion-card.selectable{cursor:pointer}
.emotion-card.selected{outline:2px solid var(--primary);box-shadow:0 12px 30px rgba(124,77,255,.25)}
.emotion-card.ripple::after{content:"";position:absolute;inset:0;border-radius:inherit;background:radial-gradient(circle, rgba(124,77,255,.25) 0%, transparent 60%);animation:ripple .6s ease-out forwards;pointer-events:none}
@keyframes ripple{from{opacity:1}to{opacity:0;transform:scale(1.1)}}

.section{padding:56px 0}
.section.alt{background:linear-gradient(0deg, rgba(127,127,127,0.04), rgba(127,127,127,0.04))}
.grid.three{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.card{position:relative;background:var(--card);border:1px solid var(--border);border-radius:16px;padding:18px;transition:transform .15s ease, box-shadow .2s ease}
.card.feature::before{content:"";position:absolute;inset:-1px;border-radius:inherit;padding:1px;background:linear-gradient(120deg, rgba(124,77,255,.8), rgba(64,169,255,.6));-webkit-mask:linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none}
.card.feature:hover{transform:translateY(-3px)}
.card.feature{box-shadow:0 6px 18px rgba(0,0,0,.06)}

.why-grid{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.why-card{border:1px dashed var(--border);border-radius:12px;padding:14px 16px;background:transparent}
.note{margin-top:10px}

.emotion-demo{user-select:none}
.input{width:100%;padding:12px 14px;border:1px solid var(--border);border-radius:12px;background:var(--card);color:var(--text)}
.try-actions{display:flex;gap:8px;margin-top:12px}
.try-actions .btn{white-space:nowrap}

.screens-grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.screen-placeholder{position:relative;aspect-ratio:9/19.5;border-radius:24px;border:1px dashed var(--border);display:flex;align-items:center;justify-content:center;color:#8290a0;background:var(--card);overflow:hidden}
.screen-placeholder.device{box-shadow:0 10px 28px rgba(0,0,0,.08)}
.screen-placeholder.device::before{content:"";position:absolute;inset:8px;border-radius:16px;padding:1px;background:linear-gradient(120deg, rgba(124,77,255,.6), rgba(64,169,255,.5));-webkit-mask:linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude}
.screen-placeholder.has-image{border-style:solid;background:#000}
.screen-placeholder img{position:absolute;inset:12px;border-radius:16px;width:calc(100% - 24px);height:calc(100% - 24px);object-fit:contain;object-position:center;image-rendering:-webkit-optimize-contrast;backface-visibility:hidden;transform:translateZ(0)}
@supports not (aspect-ratio: 1/1){
  /* Fallback for older Safari: mimic aspect ratio with padding */
  .screen-placeholder{height:auto}
  .screen-placeholder::after{content:"";display:block;padding-bottom:216%}
}

.site-footer{position:relative;border-top:1px solid var(--border);padding:28px 0;background:linear-gradient(180deg, rgba(124,77,255,0.06), transparent 20%), var(--bg)}
.site-footer::before{content:"";position:absolute;left:0;right:0;top:-1px;height:1px;background:linear-gradient(90deg, rgba(124,77,255,.6), rgba(64,169,255,.6));opacity:.6}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:12px}
.site-footer .links{display:flex;gap:10px;flex-wrap:wrap}
.site-footer .links a{opacity:.9;border:1px solid var(--border);padding:8px 12px;border-radius:999px;text-decoration:none;color:inherit;background:var(--card)}
.site-footer .links a:hover{opacity:1;box-shadow:0 6px 16px rgba(0,0,0,.08)}
@media (max-width:720px){
  .footer-inner{flex-direction:column;align-items:flex-start}
}

/* Hero premium overlays */
.hero::after{content:"";position:absolute;inset:0;pointer-events:none;background-image:radial-gradient(circle at 20% 10%, rgba(255,255,255,.08), transparent 30%), radial-gradient(circle at 80% 20%, rgba(64,169,255,.08), transparent 32%), radial-gradient(circle at 50% 90%, rgba(124,77,255,.08), transparent 34%);opacity:.6}

/* Fancy scrollbar */
*::-webkit-scrollbar{height:10px;width:10px}
*::-webkit-scrollbar-track{background:transparent}
*::-webkit-scrollbar-thumb{background:linear-gradient(180deg, rgba(124,77,255,.6), rgba(64,169,255,.6));border-radius:10px}
.muted{color:var(--muted)}

/* Reveal on scroll */
[data-reveal]{opacity:0;transform:translateY(14px);will-change:opacity, transform}
[data-reveal].visible{opacity:1;transform:none;transition:opacity .5s ease, transform .5s ease}

/* Tilt hover */
.tilt{transform-style:preserve-3d}

/* Sparkle */
.sparkle{position:relative;overflow:hidden}
.sparkle::after{content:"";position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:conic-gradient(from 0deg, transparent 0 340deg, rgba(255,255,255,.6) 360deg);transform:rotate(0deg);animation:spark 2.4s linear infinite;opacity:.35}
@keyframes spark{to{transform:rotate(360deg)}}

/* Magnetic buttons */
.btn.magnetic{position:relative;transform:translateZ(0)}
.btn.magnetic span{position:relative;z-index:1}
.btn.magnetic::before{content:"";position:absolute;inset:0;border-radius:inherit;background:radial-gradient(120px 60px at var(--mx,50%) var(--my,50%), rgba(255,255,255,.25), transparent 60%);opacity:0;transition:opacity .2s ease}
.btn.magnetic:hover::before{opacity:1}

@media (max-width:900px){
  .hero-inner{grid-template-columns:1fr;min-height:auto;padding:40px 0}
  .hero .copy h2{font-size:28px}
}
@media (max-width:640px){
  .header-inner{height:56px}
}

/* Reduced motion accessibility */
@media (prefers-reduced-motion: reduce){
  *{animation:none !important;transition:none !important;scroll-behavior:auto !important}
  [data-reveal]{opacity:1 !important;transform:none !important}
}

/* Responsive refinements for mobile */
@media (max-width: 720px){
  .container{padding:0 16px}
  .nav{gap:8px;overflow-x:hidden}
  .nav::-webkit-scrollbar{display:none}
  .nav > .theme-toggle, .nav > .lang-toggle{display:none}
  .titles .tagline{display:none}
  .titles .app-name{font-size:18px}
  .logo{width:32px;height:32px}
  .header-inner{height:52px}
  .theme-toggle,.lang-toggle{padding:8px 10px;border-radius:10px}
  .hero{border-bottom-left-radius:24px;border-bottom-right-radius:24px;overflow:hidden;margin-bottom:8px}
  .hero .container{padding-left:max(20px, env(safe-area-inset-left));padding-right:max(20px, env(safe-area-inset-right))}
  .hero-inner{padding:34px 0;gap:16px}
  .hero .lead{font-size:14px}
  .bullets{margin:6px 0 14px}
  .bullets li{margin:4px 0;font-size:14px}
  .cta-group{flex-wrap:wrap;flex-direction:column;align-items:stretch}
  .btn{padding:10px 14px;border-radius:12px;width:100%}
  .visual{order:2}
  .hero .copy{order:1}
  .emotion-stack{grid-template-columns:repeat(2, 1fr)}
  .section{padding:44px 0}
  .screens-grid{grid-template-columns:repeat(2,minmax(140px,1fr))}
  .decor.gradient{display:none}
  .badges{gap:6px;overflow-x:auto;-webkit-overflow-scrolling:touch;padding-bottom:4px}
  .badges::-webkit-scrollbar{display:none}
}
@media (max-width: 540px){
  .visual{display:none}
}
@media (max-width: 420px){
  .hero .copy h2{font-size:22px;line-height:1.25}
  .container{padding:0 12px}
  .btn{padding:9px 12px}
  .screen-placeholder::before{inset:6px;border-radius:14px}
  .screen-placeholder img{inset:10px;border-radius:14px}
  .screens-grid{grid-template-columns:1fr}
}