/* ============ NOVI Hero · 暗黑霓虹 · 流体大字报 ============ */
:root{
  --void:#05070C; --ink-0:#070A11; --ink-1:#0B0F1A; --ink-2:#111726;
  --line:rgba(120,160,220,.16); --line-2:rgba(120,160,220,.08);
  --txt:#EAF1FF; --txt-dim:#9FB0CC; --txt-faint:#5E708C;
  /* neon accents — set by JS from active palette */
  --c1:#3B9BFF; --c1-hi:#6FB8FF; --c2:#1FE7D2; --c3:#37E27E; --spark:#FFA640;
  --glow1:rgba(59,155,255,.55); --glow2:rgba(31,231,210,.5);
  --font-d:"Geist","Noto Sans SC",system-ui,sans-serif;
  --font-cn:"Noto Sans SC","Geist",system-ui,sans-serif;
  --font-m:"Geist Mono",ui-monospace,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{background:var(--void);color:var(--txt);font-family:var(--font-d);
  -webkit-font-smoothing:antialiased;overflow-x:hidden;line-height:1.5}
::selection{background:var(--c1);color:#04060B}
button{font-family:inherit;cursor:pointer}
a{color:inherit;text-decoration:none}
#root{min-height:100%}

/* ---------- stage ---------- */
.stage{position:relative;min-height:100svh;display:flex;flex-direction:column;overflow:visible}
canvas.fx{position:fixed;inset:0;z-index:0;pointer-events:none}
.scrim{position:fixed;inset:0;z-index:1;pointer-events:none;
  background:
    radial-gradient(1200px 760px at 76% -10%, rgba(59,155,255,.13), transparent 60%),
    radial-gradient(900px 620px at 8% 16%, rgba(31,231,210,.09), transparent 60%),
    radial-gradient(1100px 900px at 50% 128%, rgba(255,166,64,.06), transparent 55%),
    linear-gradient(180deg, rgba(5,7,12,.2), rgba(5,7,12,.55) 70%, var(--void));}
.grain{position:fixed;inset:0;z-index:2;pointer-events:none;opacity:.45;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.5'/%3E%3C/svg%3E");}

/* ---------- nav ---------- */
.nav{position:relative;z-index:5;display:flex;align-items:center;gap:26px;
  padding:22px clamp(18px,4vw,52px)}
.brand{display:flex;align-items:center;gap:11px}
.brand img{width:30px;height:30px;filter:drop-shadow(0 0 10px var(--glow1))}
.brand b{font-weight:700;font-size:18px;letter-spacing:-.02em}
.brand .cn{font-family:var(--font-cn);font-weight:300;color:var(--txt-dim);font-size:11px;letter-spacing:.34em;padding-left:1px}
.nav .links{display:flex;gap:26px;margin-left:18px}
.nav .links a{font-family:var(--font-cn);font-size:14px;color:var(--txt-dim);transition:color .2s;position:relative}
.nav .links a:hover{color:var(--txt)}
.nav .right{margin-left:auto;display:flex;align-items:center;gap:16px}
.nav .login{font-family:var(--font-cn);font-size:14px;color:var(--txt-dim)}
.nav .login:hover{color:var(--txt)}
.btn-primary{display:inline-flex;align-items:center;gap:8px;height:40px;padding:0 18px;border:none;border-radius:10px;
  font-family:var(--font-cn);font-weight:500;font-size:14px;color:#04060B;
  background:linear-gradient(120deg,var(--c1-hi),var(--c2));
  box-shadow:0 0 0 1px rgba(255,255,255,.1) inset, 0 8px 24px -8px var(--glow1);
  transition:transform .15s var(--ease,cubic-bezier(.2,.7,.2,1)),box-shadow .2s}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 0 0 1px rgba(255,255,255,.18) inset,0 12px 30px -8px var(--glow1)}
.btn-primary .kbd{font-family:var(--font-m);font-size:11px;background:rgba(0,0,0,.18);border-radius:5px;padding:2px 6px}

/* ---------- hero body ---------- */
.hero{position:relative;z-index:4;flex:1;display:flex;flex-direction:column;align-items:center;
  justify-content:center;text-align:center;padding:18px clamp(18px,4vw,52px) 48px;gap:22px}
.badge{display:inline-flex;align-items:center;gap:9px;font-family:var(--font-m);font-size:12px;
  letter-spacing:.02em;color:var(--c2);border:1px solid var(--line);border-radius:999px;
  padding:7px 15px;background:rgba(31,231,210,.05);backdrop-filter:blur(6px)}
.badge .pulse{width:7px;height:7px;border-radius:50%;background:var(--c2);box-shadow:0 0 0 0 var(--glow2);animation:pulse 2.2s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 var(--glow2)}70%{box-shadow:0 0 0 9px rgba(31,231,210,0)}100%{box-shadow:0 0 0 0 rgba(31,231,210,0)}}

.title{font-family:var(--font-cn);font-weight:900;font-size:clamp(44px,9.2vw,118px);line-height:.92;
  letter-spacing:-.02em;max-width:14ch;text-wrap:balance}
.title .l2{display:block}
.title .grad{background:linear-gradient(100deg,var(--c1-hi) 0%,var(--c2) 52%,var(--c3) 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  filter:drop-shadow(0 0 30px rgba(59,155,255,.4))}
.title .latin{font-family:var(--font-d);font-weight:800;letter-spacing:-.03em}

.lead{font-family:var(--font-cn);font-weight:300;font-size:clamp(15px,1.9vw,20px);color:var(--txt-dim);
  max-width:600px;line-height:1.65;text-wrap:pretty}
.lead b{color:var(--txt);font-weight:500}

/* ---------- prompt console ---------- */
.promptwrap{position:relative;width:min(680px,100%);margin-top:4px}
.promptwrap::before{content:"";position:absolute;inset:-1px;border-radius:19px;z-index:-1;
  background:conic-gradient(from var(--ang,0deg),var(--c1),var(--c2),var(--c3),var(--spark),var(--c1));
  opacity:0;transition:opacity .3s;filter:blur(7px)}
.promptwrap.focused::before{opacity:.55;animation:spin 5s linear infinite}
@keyframes spin{to{--ang:360deg}}
@property --ang{syntax:'<angle>';inherits:false;initial-value:0deg}
.prompt{border:1px solid var(--line);border-radius:18px;background:rgba(10,14,24,.62);
  backdrop-filter:blur(16px);box-shadow:0 26px 70px -28px rgba(0,0,0,.9);overflow:hidden;text-align:left}
.prompt .ta-area{position:relative;padding:18px 18px 4px}
.prompt textarea{width:100%;border:none;outline:none;resize:none;background:transparent;
  color:var(--txt);font-family:var(--font-cn);font-size:16px;line-height:1.5;min-height:52px}
.prompt .ph{position:absolute;left:18px;top:18px;color:var(--txt-faint);font-family:var(--font-cn);
  font-size:16px;pointer-events:none}
.prompt .ph .car{display:inline-block;width:2px;height:18px;background:var(--c2);vertical-align:-3px;margin-left:1px;animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.prompt .toolbar{display:flex;align-items:center;gap:8px;padding:10px 14px 14px}
.chip{display:inline-flex;align-items:center;gap:6px;height:34px;padding:0 12px;border-radius:9px;
  border:1px solid var(--line);background:rgba(255,255,255,.02);color:var(--txt-dim);
  font-family:var(--font-cn);font-size:13px;transition:.18s}
.chip:hover{border-color:var(--line);background:rgba(255,255,255,.06);color:var(--txt)}
.chip svg{width:15px;height:15px}
.build{margin-left:auto;display:inline-flex;align-items:center;gap:8px;height:40px;padding:0 16px;border:none;border-radius:11px;
  color:#04060B;font-family:var(--font-cn);font-weight:600;font-size:14px;
  background:linear-gradient(120deg,var(--c1-hi),var(--c2));
  box-shadow:0 0 0 1px rgba(255,255,255,.12) inset,0 10px 28px -10px var(--glow1);
  transition:transform .12s,box-shadow .2s}
.build:hover{box-shadow:0 0 0 1px rgba(255,255,255,.2) inset,0 14px 34px -10px var(--glow1)}
.build svg{width:16px;height:16px}

/* suggestion chips */
.tries{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:16px;max-width:660px}
.tries .lab{font-family:var(--font-cn);font-size:13px;color:var(--txt-faint);align-self:center}
.try{font-family:var(--font-cn);font-size:13px;color:var(--txt-dim);border:1px solid var(--line-2);
  border-radius:999px;padding:7px 13px;background:rgba(255,255,255,.015);transition:.18s}
.try:hover{border-color:var(--c2);color:var(--txt);background:rgba(31,231,210,.06)}

/* trust line */
.trust{display:flex;flex-wrap:wrap;gap:18px;justify-content:center;margin-top:8px;
  font-family:var(--font-cn);font-size:13px;color:var(--txt-faint)}
.trust span{display:inline-flex;align-items:center;gap:7px}
.trust i{width:5px;height:5px;border-radius:50%;background:var(--c3);box-shadow:0 0 7px var(--c3);font-style:normal}

/* sparrow mascot */
.sparrow{position:absolute;right:clamp(8px,4vw,70px);bottom:clamp(8px,3vw,40px);z-index:4;
  width:clamp(74px,9vw,120px);pointer-events:none;
  filter:drop-shadow(0 10px 22px rgba(0,0,0,.5));animation:bob 4.5s ease-in-out infinite}
.sparrow img{width:100%;display:block;image-rendering:pixelated}
@keyframes bob{0%,100%{transform:translateY(0) rotate(-1deg)}50%{transform:translateY(-9px) rotate(1.5deg)}}

/* scroll cue */
.cue{position:absolute;left:50%;bottom:18px;transform:translateX(-50%);z-index:4;
  display:flex;flex-direction:column;align-items:center;gap:7px;
  font-family:var(--font-m);font-size:10.5px;letter-spacing:.18em;color:var(--txt-faint)}
.cue .bar{width:1px;height:30px;background:linear-gradient(var(--c1),transparent);box-shadow:0 0 8px var(--glow1);
  animation:cueLine 1.8s ease-in-out infinite}
@keyframes cueLine{0%,100%{transform:scaleY(.5);opacity:.5;transform-origin:top}50%{transform:scaleY(1);opacity:1;transform-origin:top}}

/* reveal on load — base state is VISIBLE; entrance only translates (never hides),
   so content shows even if CSS animations are throttled/play-pending */
.rv{opacity:1}
@media (prefers-reduced-motion: no-preference){
  .rv{animation:rvIn .7s cubic-bezier(.2,.7,.2,1) both}
  .rv.d1{animation-delay:.04s}.rv.d2{animation-delay:.12s}.rv.d3{animation-delay:.2s}
  .rv.d4{animation-delay:.32s}.rv.d5{animation-delay:.46s}.rv.d6{animation-delay:.6s}
}
@keyframes rvIn{from{transform:translateY(16px)}to{transform:none}}
@media (prefers-reduced-motion: reduce){
  .sparrow,.cue .bar,.badge .pulse{animation:none}}

/* mobile nav */
.nav .menu-btn{display:none;margin-left:auto;width:40px;height:40px;border-radius:10px;
  border:1px solid var(--line);background:rgba(255,255,255,.03);color:var(--txt);align-items:center;justify-content:center}
.nav .menu-btn svg{width:20px;height:20px}
@media(max-width:780px){
  .nav .links{display:none}
  .nav .right .login{display:none}
  .nav .menu-btn{display:inline-flex}
  .nav .right{margin-left:0}
  .title{font-size:clamp(40px,12vw,72px)}
  .sparrow{display:none}
  .trust{gap:12px;font-size:12px}
}
/* short viewports — compress so the first screen still fits */
@media(max-height:760px){
  .hero{gap:15px;padding-top:8px}
  .title{font-size:clamp(38px,7.2vw,80px)}
}
@media(max-height:620px){
  .hero{gap:11px}
  .title{font-size:clamp(32px,6vw,58px)}
  .badge{padding:5px 12px;font-size:11px}
  .prompt textarea{min-height:40px}
}