/* ============================================================
   Nikov 在线工具 — 现代深色科技设计系统
   ============================================================ */
:root{
  --bg:#060912;
  --bg-2:#0a1020;
  --surface:rgba(255,255,255,.045);
  --surface-2:rgba(255,255,255,.07);
  --border:rgba(255,255,255,.09);
  --border-strong:rgba(255,255,255,.16);
  --text:#eaf0fb;
  --text-dim:#9aa7c2;
  --text-mute:#667291;
  --cyan:#22d3ee;
  --blue:#3b82f6;
  --violet:#8b5cf6;
  --pink:#ec4899;
  --green:#34d399;
  --red:#fb7185;
  --amber:#fbbf24;
  --grad:linear-gradient(120deg,#22d3ee 0%,#3b82f6 48%,#8b5cf6 100%);
  --grad-soft:linear-gradient(120deg,rgba(34,211,238,.16),rgba(139,92,246,.16));
  --shadow:0 24px 70px -24px rgba(0,0,0,.85);
  --glow:0 0 0 1px rgba(34,211,238,.25),0 12px 40px -12px rgba(34,211,238,.35);
  --radius:18px;
  --font:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',system,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --mono:ui-monospace,'SF Mono','JetBrains Mono','Cascadia Code',Consolas,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:var(--font);color:var(--text);
  background:var(--bg);line-height:1.6;
  -webkit-font-smoothing:antialiased;min-height:100vh;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
::selection{background:rgba(59,130,246,.4)}

/* ---------- 背景：光晕 + 网格 ---------- */
.bg{position:fixed;inset:0;z-index:-2;overflow:hidden;background:
  radial-gradient(1200px 700px at 70% -10%,#101a36 0,transparent 60%),
  radial-gradient(900px 600px at 10% 110%,#0d1530 0,transparent 55%),var(--bg)}
.orb{position:absolute;border-radius:50%;filter:blur(90px);opacity:.5;animation:drift 18s ease-in-out infinite alternate}
.orb1{width:520px;height:520px;left:-120px;top:-140px;background:radial-gradient(circle,rgba(34,211,238,.55),transparent 70%)}
.orb2{width:560px;height:560px;right:-160px;top:10%;background:radial-gradient(circle,rgba(139,92,246,.5),transparent 70%);animation-delay:-6s}
.orb3{width:480px;height:480px;left:30%;bottom:-200px;background:radial-gradient(circle,rgba(59,130,246,.45),transparent 70%);animation-delay:-11s}
.grid{position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(circle at 50% 30%,#000 0,transparent 75%);
  -webkit-mask-image:radial-gradient(circle at 50% 30%,#000 0,transparent 75%)}
@keyframes drift{from{transform:translate3d(0,0,0) scale(1)}to{transform:translate3d(40px,30px,0) scale(1.12)}}

/* ---------- 通用容器 ---------- */
.wrap{width:min(1160px,92%);margin:0 auto}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.mono{font-family:var(--mono)}

/* ---------- 玻璃卡片 ---------- */
.card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  box-shadow:var(--shadow);position:relative;
}
.card::before{content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;
  background:linear-gradient(160deg,rgba(255,255,255,.18),transparent 40%);
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 26px;border-radius:12px;font-weight:600;font-size:15px;
  cursor:pointer;border:1px solid transparent;color:#fff;white-space:nowrap;
  background:var(--grad);background-size:160% 160%;
  box-shadow:0 10px 30px -10px rgba(59,130,246,.6);
  transition:transform .18s ease,box-shadow .25s ease,background-position .4s ease;
  user-select:none;
}
.btn:hover{transform:translateY(-2px);background-position:100% 50%;box-shadow:0 16px 44px -12px rgba(139,92,246,.7)}
.btn:active{transform:translateY(0)}
.btn.ghost{background:var(--surface-2);border-color:var(--border-strong);box-shadow:none;color:var(--text)}
.btn.ghost:hover{background:rgba(255,255,255,.1);box-shadow:none}
.btn.sm{padding:9px 18px;font-size:14px}
.btn.block{width:100%}
.btn:disabled{opacity:.6;cursor:not-allowed;transform:none}

/* ---------- 表单 ---------- */
.field{margin-bottom:16px}
.field label,.lab{display:block;font-size:13px;color:var(--text-dim);margin-bottom:7px;font-weight:500}
.inp{
  width:100%;padding:13px 15px;border-radius:11px;color:var(--text);
  background:rgba(5,9,18,.6);border:1px solid var(--border);
  font-size:15px;font-family:inherit;transition:border-color .2s,box-shadow .2s;outline:none;
}
.inp::placeholder{color:#5b6680}
.inp:focus{border-color:rgba(34,211,238,.55);box-shadow:0 0 0 3px rgba(34,211,238,.14)}
.inp.mono{font-family:var(--mono);letter-spacing:.5px}
.input-icon{position:relative}
.input-icon .inp{padding-right:46px}
.input-icon .eye{position:absolute;right:12px;top:50%;transform:translateY(-50%);
  background:none;border:none;color:var(--text-dim);cursor:pointer;padding:6px;border-radius:8px}
.input-icon .eye:hover{color:var(--text)}

/* ---------- 自定义滑块 ---------- */
input[type=range].slider{
  -webkit-appearance-range:none;-webkit-appearance:none;appearance:none;
  width:100%;height:6px;border-radius:6px;outline:none;cursor:pointer;
  background:linear-gradient(90deg,#22d3ee,#3b82f6,#8b5cf6);
  background-size:100% 100%;
}
input[type=range].slider::-webkit-slider-thumb{
  -webkit-appearance:none;width:22px;height:22px;border-radius:50%;
  background:#fff;border:3px solid #3b82f6;cursor:grab;
  box-shadow:0 0 0 6px rgba(59,130,246,.18),0 4px 14px rgba(0,0,0,.5);transition:box-shadow .2s}
input[type=range].slider::-webkit-slider-thumb:active{cursor:grabbing;box-shadow:0 0 0 9px rgba(34,211,238,.25)}
input[type=range].slider::-moz-range-thumb{width:20px;height:20px;border-radius:50%;background:#fff;border:3px solid #3b82f6;cursor:grab;box-shadow:0 0 0 6px rgba(59,130,246,.18)}

/* ---------- 步骤指示器 ---------- */
.steps{display:flex;align-items:center;gap:0;margin:6px 0 26px}
.step{display:flex;align-items:center;gap:9px;color:var(--text-dim);font-size:13px;font-weight:500}
.step .dot{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;
  background:rgba(255,255,255,.06);border:1px solid var(--border);font-size:13px;transition:.3s}
.step.active{color:var(--text)}
.step.active .dot{background:var(--grad);border-color:transparent;color:#fff;box-shadow:0 0 18px -2px rgba(59,130,246,.7)}
.step.done .dot{background:rgba(52,211,153,.15);border-color:rgba(52,211,153,.5);color:var(--green)}
.step-line{flex:1;height:1px;background:var(--border);margin:0 12px;min-width:24px}

/* ---------- 提示 / 错误 ---------- */
.alert{display:flex;gap:10px;align-items:flex-start;padding:11px 14px;border-radius:11px;
  font-size:13.5px;margin-bottom:16px;border:1px solid;opacity:0;transform:translateY(-4px);
  transition:opacity .25s,transform .25s}
.alert.show{opacity:1;transform:translateY(0)}
.alert.error{background:rgba(251,113,133,.1);border-color:rgba(251,113,133,.35);color:#fda4af}
.alert.info{background:rgba(59,130,246,.1);border-color:rgba(59,130,246,.3);color:#93c5fd}
.alert .ic{flex:none;margin-top:1px}

/* ---------- 密码强度 ---------- */
.strength{margin-top:9px}
.strength .track{height:5px;border-radius:5px;background:rgba(255,255,255,.08);overflow:hidden}
.strength .bar{height:100%;width:0;border-radius:5px;transition:width .35s,background .35s;background:var(--red)}
.strength .txt{font-size:12px;color:var(--text-dim);margin-top:5px}

/* ---------- spinner ---------- */
.spinner{width:20px;height:20px;border-radius:50%;border:2.5px solid rgba(255,255,255,.25);
  border-top-color:#fff;animation:spin .7s linear infinite;display:inline-block}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- 认证页布局 ---------- */
.auth{min-height:100vh;display:grid;place-items:center;padding:70px 18px 40px}
.auth-card{width:min(440px,100%);padding:34px 34px 30px}
.auth-card.wide{width:min(520px,100%)}
.auth-head{text-align:center;margin-bottom:24px}
.auth-head h1{margin:14px 0 6px;font-size:24px;letter-spacing:-.01em}
.auth-head p{margin:0;color:var(--text-dim);font-size:14px}
.auth-foot{text-align:center;margin-top:20px;font-size:14px;color:var(--text-dim)}
.auth-foot a{color:var(--cyan);font-weight:600}
.auth-foot a:hover{text-decoration:underline}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:700;font-size:17px}
.logo-mark{width:34px;height:34px;border-radius:10px;background:var(--grad);display:grid;place-items:center;
  box-shadow:0 6px 18px -4px rgba(59,130,246,.7);color:#fff;font-weight:800}

/* ---------- 滑块选手机号 ---------- */
.phone-display{text-align:center;padding:18px 16px;border-radius:13px;background:rgba(5,9,18,.6);
  border:1px solid var(--border);margin-bottom:16px}
.phone-display .num{font-family:var(--mono);font-size:30px;font-weight:600;letter-spacing:2px}
.phone-display .hint{font-size:12px;color:var(--text-dim);margin-top:4px}

/* ---------- 人机验证图 ---------- */
.captcha{width:100%;aspect-ratio:1/1;border-radius:13px;position:relative;overflow:hidden;
  background:url(c.jpg) center/cover;border:1px solid var(--border)}
.captcha .gap{position:absolute;width:25%;height:25%;background:#000;top:25%;left:50%;border-radius:6px;
  box-shadow:0 0 0 1px rgba(255,255,255,.15)}
.captcha .puzzle{position:absolute;width:25%;height:25%;top:25%;left:0;border-radius:6px;
  background:url(c.jpg);background-size:400% 400%;box-shadow:0 4px 14px rgba(0,0,0,.5),0 0 0 1px rgba(255,255,255,.25)}
.captcha-note{text-align:center;font-size:13px;color:var(--text-dim);margin:14px 0 4px;min-height:38px}

/* ---------- 落地页：导航 ---------- */
.nav{position:fixed;top:0;left:0;right:0;z-index:50;transition:.3s}
.nav-inner{display:flex;align-items:center;justify-content:space-between;padding:16px 0}
.nav.scrolled .nav-bar{background:rgba(8,12,24,.72);backdrop-filter:blur(16px);border:1px solid var(--border);border-radius:16px;padding:10px 18px}
.nav-links{display:flex;gap:30px;font-size:14.5px;color:var(--text-dim)}
.nav-links a:hover{color:var(--text)}
.nav-actions{display:flex;gap:12px;align-items:center}

/* ---------- Hero ---------- */
.hero{padding:170px 0 90px;text-align:center;position:relative}
.badge{display:inline-flex;align-items:center;gap:8px;padding:7px 15px;border-radius:999px;
  background:var(--grad-soft);border:1px solid var(--border-strong);font-size:13px;color:var(--text-dim);margin-bottom:26px}
.badge .dot-live{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 10px var(--green);animation:pulse 1.8s infinite}
@keyframes pulse{50%{opacity:.4}}
.hero h1{font-size:clamp(38px,6vw,68px);line-height:1.08;margin:0 auto 22px;letter-spacing:-.02em;max-width:14ch;font-weight:800}
.hero p.lead{font-size:clamp(16px,2vw,19px);color:var(--text-dim);max-width:600px;margin:0 auto 36px}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero-stats{display:flex;gap:44px;justify-content:center;margin-top:64px;flex-wrap:wrap}
.hero-stats .s .n{font-size:30px;font-weight:800;font-family:var(--mono)}
.hero-stats .s .l{font-size:13px;color:var(--text-dim)}

/* ---------- 区块标题 ---------- */
.section{padding:80px 0}
.sec-head{text-align:center;max-width:640px;margin:0 auto 54px}
.sec-head .kicker{font-size:13px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--cyan)}
.sec-head h2{font-size:clamp(28px,4vw,42px);margin:12px 0 14px;letter-spacing:-.01em;font-weight:800}
.sec-head p{color:var(--text-dim);margin:0;font-size:16px}

/* ---------- 特性 ---------- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.feature{padding:28px 26px;transition:transform .3s,border-color .3s}
.feature:hover{transform:translateY(-6px);border-color:var(--border-strong)}
.feature .ic{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;margin-bottom:18px;
  background:var(--grad-soft);border:1px solid var(--border);color:var(--cyan)}
.feature h3{margin:0 0 9px;font-size:18px}
.feature p{margin:0;color:var(--text-dim);font-size:14.5px}

/* ---------- VIP / 定价 ---------- */
.vip{padding:44px;border-radius:24px;display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center;overflow:hidden}
.vip .tag{display:inline-block;padding:5px 13px;border-radius:999px;background:rgba(251,191,36,.14);
  border:1px solid rgba(251,191,36,.4);color:var(--amber);font-size:12.5px;font-weight:600;margin-bottom:18px}
.vip h2{font-size:30px;margin:0 0 12px}
.vip ul{list-style:none;padding:0;margin:18px 0 0;display:grid;gap:11px}
.vip li{display:flex;gap:10px;align-items:center;color:var(--text-dim);font-size:14.5px}
.vip li .ck{color:var(--green);flex:none}
.price-card{text-align:center;padding:34px 28px;border-radius:18px;background:rgba(5,9,18,.55);border:1px solid var(--border)}
.price-card .amt{font-size:52px;font-weight:800;font-family:var(--mono)}
.price-card .amt small{font-size:16px;color:var(--text-dim);font-weight:500}
.price-card .per{color:var(--text-dim);font-size:14px;margin:2px 0 22px}

/* ---------- 最终 CTA ---------- */
.final-cta{text-align:center;padding:80px 40px;border-radius:24px;
  background:radial-gradient(600px 300px at 50% 0,rgba(59,130,246,.22),transparent 70%),var(--surface);
  border:1px solid var(--border)}
.final-cta h2{font-size:clamp(28px,4vw,40px);margin:0 0 14px}
.final-cta p{color:var(--text-dim);margin:0 0 30px}

/* ---------- 页脚 ---------- */
.footer{border-top:1px solid var(--border);padding:40px 0;margin-top:80px}
.footer-inner{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap}
.footer .meta{color:var(--text-dim);font-size:13px}
.footer-links{display:flex;gap:24px;font-size:13.5px;color:var(--text-dim)}
.footer-links a:hover{color:var(--text)}

/* ---------- 滚动 reveal ---------- */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease}
.reveal.visible{opacity:1;transform:none}
.reveal.d1{transition-delay:.08s}.reveal.d2{transition-delay:.16s}.reveal.d3{transition-delay:.24s}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}.orb{animation:none}}

/* ---------- 响应式 ---------- */
@media(max-width:900px){
  .grid-3{grid-template-columns:1fr}
  .vip{grid-template-columns:1fr;gap:28px}
  .nav-links{display:none}
}
@media(max-width:520px){
  .auth-card{padding:28px 22px}
  .hero{padding:140px 0 60px}
  .hero-stats{gap:28px}
  .step-line{margin:0 7px}
  .step span.lbl{display:none}
}