/* Go Danang — mobile-first, nhẹ, không framework */
:root{
  --blue:#0a6ebd;
  --blue-dark:#084e86;
  --sand:#ffb800;
  --ink:#1c2733;
  --muted:#5b6b7b;
  --bg:#f6f9fc;
  --card:#ffffff;
  --amber-bg:#fff7e6;
  --amber-line:#f0c96a;
  --radius:14px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo","Noto Sans KR","Segoe UI",Roboto,sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.6;font-size:16px;
}
.wrap{max-width:640px;margin:0 auto;padding:0 16px}

/* Top bar */
.topbar{
  position:sticky;top:0;z-index:10;
  background:rgba(255,255,255,.96);backdrop-filter:blur(6px);
  border-bottom:1px solid #e6edf3;
}
.topbar .wrap{display:flex;align-items:center;justify-content:space-between;height:56px}
.brand{text-decoration:none;font-weight:800;font-size:18px;color:var(--ink)}
.lang-toggle{display:flex;gap:6px}
.lang-btn{
  border:1px solid #d7e2ec;background:#fff;border-radius:999px;
  padding:6px 12px;font-size:13px;font-weight:700;color:var(--muted);cursor:pointer;
}
.lang-btn.active{background:var(--blue);border-color:var(--blue);color:#fff}

/* Hero */
.hero{
  background:linear-gradient(135deg,var(--blue) 0%,#1290d8 60%,#2bb3a3 100%);
  color:#fff;border-radius:0 0 24px 24px;padding:40px 0 32px;margin-bottom:20px;
}
.hero h1{font-size:28px;line-height:1.35;margin:8px 0}
.hero p{opacity:.92;font-size:15px}
.hero .kicker{font-size:13px;font-weight:700;letter-spacing:.06em;opacity:.85;text-transform:uppercase}

/* Notice (storm banner) */
.notice{
  background:var(--amber-bg);border:1px solid var(--amber-line);
  border-radius:var(--radius);padding:12px 14px;font-size:14px;margin-bottom:20px;
}

/* Segment cards (home) */
.seg-grid{display:grid;gap:12px;margin:4px 0 24px}
.seg-card{
  display:block;background:var(--card);border-radius:var(--radius);
  padding:18px;text-decoration:none;color:var(--ink);
  box-shadow:0 2px 10px rgba(10,110,189,.08);border:1px solid #e9f0f6;
}
.seg-card .emoji{font-size:30px}
.seg-card h2{font-size:19px;margin:6px 0 4px}
.seg-card p{font-size:14px;color:var(--muted)}
.seg-card .go{color:var(--blue);font-weight:800;font-size:14px}

/* Section titles */
.sec-title{font-size:20px;margin:20px 0 12px}

/* Product cards */
.card{
  background:var(--card);border-radius:var(--radius);padding:18px;margin-bottom:14px;
  box-shadow:0 2px 10px rgba(10,110,189,.08);border:1px solid #e9f0f6;
}
.card-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.provider{
  font-size:12px;font-weight:800;color:var(--blue-dark);
  background:#e8f3fc;border-radius:999px;padding:3px 10px;
}
.fit{font-size:12px;font-weight:700;color:#8a6d00}
.card h3{font-size:17px;line-height:1.45;margin-bottom:6px}
.card .why{font-size:14px;color:var(--muted);margin-bottom:14px}
.cta{
  display:block;text-align:center;text-decoration:none;
  background:var(--blue);color:#fff;font-weight:800;font-size:16px;
  border-radius:12px;padding:14px;min-height:48px;
}
.cta:active{background:var(--blue-dark)}

/* Tip box */
.tip{
  background:#eef7ee;border:1px solid #bfe3bf;border-radius:var(--radius);
  padding:12px 14px;font-size:14px;margin:0 0 20px;
}

/* Feature strip */
.strip{
  background:var(--card);border:1px dashed #c9d9e8;border-radius:var(--radius);
  padding:14px;font-size:14px;margin-bottom:24px;text-align:center;
}

/* Bio page */
.bio{background:linear-gradient(160deg,var(--blue) 0%,#1290d8 70%,#2bb3a3 100%);min-height:100vh;color:#fff}
.bio .wrap{padding-top:48px;padding-bottom:48px;text-align:center}
.bio h1{font-size:24px;margin:10px 0 4px}
.bio .sub{opacity:.9;font-size:14px;margin-bottom:28px}
.bio a.blink{
  display:block;background:#fff;color:var(--ink);text-decoration:none;font-weight:700;
  border-radius:14px;padding:16px;margin-bottom:12px;font-size:16px;
  box-shadow:0 4px 14px rgba(0,0,0,.12);
}
.bio a.blink:active{transform:scale(.98)}

/* Footer */
footer{padding:28px 0 40px;color:var(--muted);font-size:12px;text-align:center}
footer a{color:var(--blue)}
.back{display:inline-block;margin:4px 0 16px;color:var(--blue);text-decoration:none;font-weight:700;font-size:14px}