:root{
  --bg:#f6f9ff;
  --surface:#ffffff;
  --ink:#0b1f3a;
  --muted:#5a6b85;
  --brand:#1e7bff;
  --brand-dark:#0a57c2;
  --brand-soft:#e6f0ff;
  --accent:#ffb800;
  --line:#e3ebf6;
  --ok:#16a34a;
  --radius:14px;
  --shadow:0 10px 30px rgba(15,40,90,.08);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:'Pretendard','Apple SD Gothic Neo','Malgun Gothic',system-ui,-apple-system,sans-serif;line-height:1.65;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block;height:auto}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1120px;margin:0 auto;padding:0 20px}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;max-width:1120px;margin:0 auto}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--ink);font-size:18px}
.brand img{width:32px;height:32px}
.nav ul{display:flex;gap:22px;list-style:none;margin:0;padding:0}
.nav a.navlink{color:var(--ink);font-weight:600;font-size:15px}
.nav .cta{background:var(--brand);color:#fff;padding:10px 16px;border-radius:10px;font-weight:700}
.nav .cta:hover{background:var(--brand-dark);text-decoration:none}

/* Hero */
.hero{padding:60px 0 40px;background:linear-gradient(180deg,#eaf2ff 0%,#f6f9ff 100%)}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.eyebrow{display:inline-block;background:var(--brand-soft);color:var(--brand-dark);padding:6px 12px;border-radius:999px;font-weight:700;font-size:13px;letter-spacing:.02em}
h1{font-size:clamp(28px,4.4vw,46px);line-height:1.2;margin:14px 0 14px;letter-spacing:-.02em}
.lede{color:var(--muted);font-size:17px;margin:0 0 22px;max-width:54ch}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--brand);color:#fff;padding:14px 22px;border-radius:12px;font-weight:700;border:0;cursor:pointer;font-size:15px;transition:transform .15s,background .15s;box-shadow:var(--shadow)}
.btn:hover{background:var(--brand-dark);text-decoration:none;transform:translateY(-1px)}
.btn.ghost{background:#fff;color:var(--brand);border:1px solid var(--brand-soft);box-shadow:none}
.btn.ghost:hover{background:var(--brand-soft)}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap}
.hero-img{border-radius:24px;overflow:hidden;background:#fff;box-shadow:var(--shadow)}

/* Stats strip */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:34px 0 0}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px;text-align:center}
.stat b{display:block;font-size:22px;color:var(--brand-dark)}
.stat span{color:var(--muted);font-size:13px}

/* Sections */
section{padding:64px 0}
.section-head{text-align:center;margin-bottom:36px}
.section-head h2{font-size:clamp(24px,3vw,34px);margin:0 0 10px;letter-spacing:-.02em}
.section-head p{color:var(--muted);margin:0;font-size:16px}

/* Coupon cards */
.coupons{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.coupon-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;text-align:center;position:relative;overflow:hidden;box-shadow:var(--shadow);transition:transform .2s}
.coupon-card:hover{transform:translateY(-4px)}
.coupon-card::before,.coupon-card::after{content:"";position:absolute;width:24px;height:24px;border-radius:50%;background:var(--bg);top:50%;transform:translateY(-50%)}
.coupon-card::before{left:-12px}
.coupon-card::after{right:-12px}
.coupon-tag{display:inline-block;background:var(--accent);color:#3a2a00;font-weight:800;font-size:12px;padding:4px 10px;border-radius:999px;margin-bottom:10px}
.coupon-code{font-family:'JetBrains Mono','Courier New',monospace;font-size:24px;font-weight:800;letter-spacing:.04em;color:var(--ink);background:var(--brand-soft);padding:14px;border-radius:10px;margin:14px 0;border:1px dashed var(--brand)}
.coupon-desc{color:var(--muted);font-size:14px;margin:0 0 14px}
.copy-btn{width:100%;padding:12px;border-radius:10px;background:var(--brand);color:#fff;font-weight:700;border:0;cursor:pointer;font-size:14px;transition:background .15s}
.copy-btn:hover{background:var(--brand-dark)}
.copy-btn.copied{background:var(--ok)}

/* Features */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feature{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column}
.feature img{aspect-ratio:4/3;object-fit:cover}
.feature .body{padding:20px}
.feature h3{margin:0 0 8px;font-size:18px}
.feature p{margin:0;color:var(--muted);font-size:14.5px}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;counter-reset:step}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;position:relative}
.step::before{counter-increment:step;content:counter(step);position:absolute;top:-14px;left:18px;background:var(--brand);color:#fff;width:30px;height:30px;border-radius:50%;display:grid;place-items:center;font-weight:800;font-size:14px}
.step h4{margin:6px 0 8px}
.step p{color:var(--muted);margin:0;font-size:14px}

/* Table */
.compare-wrap{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
table.compare{width:100%;border-collapse:collapse;font-size:14.5px}
table.compare th,table.compare td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--line)}
table.compare thead th{background:var(--brand-soft);color:var(--brand-dark);font-weight:700}
table.compare tbody tr:hover{background:#fafcff}
table.compare td.hi{color:var(--brand-dark);font-weight:700}
.badge{display:inline-block;font-size:11px;padding:3px 8px;border-radius:999px;background:var(--brand-soft);color:var(--brand-dark);font-weight:700;margin-left:6px}
.badge.gold{background:#fff4d1;color:#7a5300}

/* Calculator */
.calc{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);max-width:780px;margin:0 auto}
.calc h3{margin:0 0 6px}
.calc .sub{color:var(--muted);margin:0 0 22px;font-size:14px}
.calc-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.field{display:flex;flex-direction:column;gap:6px}
.field label{font-weight:600;font-size:13.5px;color:var(--ink)}
.field input,.field select{padding:12px 14px;border:1px solid var(--line);border-radius:10px;font-size:15px;background:#fff;font-family:inherit}
.field input:focus,.field select:focus{outline:2px solid var(--brand);outline-offset:0;border-color:var(--brand)}
.calc-result{margin-top:22px;background:var(--brand-soft);border-radius:12px;padding:18px;display:grid;grid-template-columns:1fr 1fr;gap:12px}
.calc-result .row{display:flex;justify-content:space-between;font-size:14.5px;color:var(--ink)}
.calc-result .row b{color:var(--brand-dark);font-size:18px}
.calc-result .full{grid-column:1/-1;border-top:1px dashed var(--brand);padding-top:12px;margin-top:4px}

/* FAQ */
.faq{display:grid;gap:10px;max-width:820px;margin:0 auto}
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 18px}
.faq summary{cursor:pointer;font-weight:700;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--brand);font-size:22px;font-weight:700}
.faq details[open] summary::after{content:"−"}
.faq p{color:var(--muted);margin:10px 0 0;font-size:15px}

/* Footer */
footer{background:#0b1f3a;color:#c5d2e6;padding:40px 0 24px;margin-top:40px}
footer .container{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:30px}
footer h5{color:#fff;margin:0 0 10px;font-size:15px}
footer a{color:#c5d2e6}
footer .copy{border-top:1px solid #1e3354;margin-top:24px;padding-top:14px;text-align:center;font-size:13px;color:#7c93b3}

/* Toast */
.toast{position:fixed;bottom:30px;left:50%;transform:translateX(-50%) translateY(20px);background:var(--ink);color:#fff;padding:12px 22px;border-radius:999px;font-weight:600;font-size:14px;opacity:0;pointer-events:none;transition:all .25s;z-index:100;box-shadow:var(--shadow)}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* Gallery */
.gallery{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.gallery figure{margin:0;border-radius:12px;overflow:hidden;background:#fff;border:1px solid var(--line)}
.gallery img{aspect-ratio:1/1;object-fit:cover}

/* Highlight box */
.highlight{background:linear-gradient(135deg,#1e7bff,#0a57c2);color:#fff;border-radius:20px;padding:38px;text-align:center;box-shadow:var(--shadow)}
.highlight h2{margin:0 0 10px;color:#fff}
.highlight p{margin:0 0 22px;opacity:.92}
.highlight .btn{background:#fff;color:var(--brand-dark)}
.highlight .btn:hover{background:#f1f6ff}

/* Responsive */
@media (max-width: 900px){
  .hero-grid{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .coupons{grid-template-columns:1fr}
  .features{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr 1fr}
  .calc-grid,.calc-result{grid-template-columns:1fr}
  .gallery{grid-template-columns:repeat(2,1fr)}
  footer .container{grid-template-columns:1fr}
  .nav ul{display:none}
}