/* ============================================================
   AIRBONE OpenEar Pro · Responsive Landing Page
   Mobile-First · Crystal-glass / sunset-gradient aesthetic
   ============================================================ */

/* ---------- Design tokens ---------- */
:root {
  --bg: #fbf7f1;          /* cream ivory base */
  --bg-soft: #fff9f1;     /* slightly warm surface tint */
  --surface: #ffffff;
  --ink: #1e1a24;         /* main ink */
  --ink-2: #6b6570;       /* secondary */
  --ink-3: #98919d;       /* tertiary */
  --primary: #ff6b35;     /* vivid orange */
  --primary-2: #ff8a5c;   /* orange transition */
  --blue: #2a6bff;        /* tech blue */
  --pink: #ffc9d4;        /* sakura pink */
  --teal: #2ad4c0;        /* accent */
  --grad: linear-gradient(120deg, #ff6b35, #ff8a5c 45%, #2a6bff);
  --grad-bubble: radial-gradient(120% 120% at 30% 0%, rgba(255,138,92,.25), rgba(42,107,255,.10) 55%, transparent 70%);
  --line: rgba(30, 26, 36, .08);
  --shadow: 0 20px 50px -20px rgba(30, 26, 36, .18);
  --shadow-soft: 0 12px 34px -18px rgba(255, 107, 53, .38);
  --radius: 20px;
  --radius-sm: 14px;
  --pill: 999px;
  --ease: cubic-bezier(.2, .6, .3, 1);
  --font-ko: "Nanum Gothic", "Poppins", system-ui, -apple-system, sans-serif;
  --font-en: "Poppins", "Nanum Gothic", system-ui, sans-serif;
}

/* ---------- Reset / base ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-ko);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul { list-style: none; }
section { position: relative; }
/* html[lang="ko"] body { font-family: var(--font-ko); } */

h1, h2, h3, h4 { line-height: 1.25; letter-spacing: -.01em; }
.ko-title, .ko-body { font-family: var(--font-ko); }
.en-title { font-family: var(--font-en); }

/* ---------- Utility ---------- */
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 22px; }
.section { padding: 64px 0; }
.section-label {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-en);
  font-size: 12px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase;
  color: var(--primary); background: rgba(255, 107, 53, .10);
  padding: 6px 14px; border-radius: var(--pill);
}
.sec-head { text-align: center; max-width: 640px; margin: 0 auto 34px; }
.sec-head .h2 {
  font-size: 26px; font-weight: 800; margin-top: 14px;
}
.sec-head .sub { color: var(--ink-2); margin-top: 12px; font-size: 15px; }
.glass {
  background: linear-gradient(150deg, rgba(255,255,255,.72), rgba(255,255,255,.30));
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  border: 1px solid rgba(255,255,255,.6);
}
.card {
  background: var(--surface); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 22px;
}

/* ---------- Reveal on scroll ---------- */
[data-reveal] { opacity: 0; transform: translateY(24px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
[data-reveal].is-in { opacity: 1; transform: none; }

/* ============================================================
   TOP PROMO BAR
   ============================================================ */
.promo {
  background: var(--grad);
  color: #fff; text-align: center;
  padding: 9px 14px; font-size: 13px; font-weight: 600;
  font-family: var(--font-en);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.promo b { font-weight: 800; text-decoration: underline; text-underline-offset: 3px; }

/* ============================================================
   NAVBAR
   ============================================================ */
.header {
  position: sticky; top: 0; z-index: 60;
  background: rgba(251, 247, 241, .82);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 10px; }
.brand { display: flex; align-items: center; gap: 9px; font-weight: 800; font-size: 18px; }
.brand .logo-dot {
  width: 30px; height: 30px; border-radius: 10px; background: var(--grad);
  display: grid; place-items: center; color: #fff; font-family: var(--font-en); font-size: 14px;
  box-shadow: var(--shadow-soft);
}
.brand small { display: block; font-size: 9px; font-weight: 600; letter-spacing: .2em; color: var(--ink-2); text-transform: uppercase; }
.nav-links { display: none; gap: 26px; font-size: 14.5px; font-weight: 600; color: var(--ink-2); }
.nav-links a { position: relative; padding: 8px 0; }
.nav-links a:hover { color: var(--ink); }
.nav-actions { display: flex; align-items: center; gap: 8px; }

.lang-switch {
  display: flex; align-items: center; gap: 4px;
  border: 1px solid var(--line); border-radius: var(--pill);
  padding: 4px; background: rgba(255,255,255,.5);
}
.lang-switch button {
  padding: 6px 9px; border-radius: var(--pill);
  font-family: var(--font-en); font-size: 12px; font-weight: 700; color: var(--ink-3);
  transition: all .25s var(--ease);
}
.lang-switch button.active { background: var(--ink); color: #fff; }

.cta-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--grad); color: #fff; font-weight: 700;
  border-radius: var(--pill); padding: 13px 22px; font-size: 15px;
  box-shadow: var(--shadow-soft); min-height: 44px;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease);
}
.cta-btn:hover { transform: translateY(-2px); box-shadow: 0 18px 40px -16px rgba(255,107,53,.5); }
.cta-btn.ghost { background: transparent; box-shadow: none; border: 1.5px solid rgba(255,255,255,.7); }

/* Hamburg */
.hamburger {
  display: grid; place-items: center;
  width: 46px; height: 46px; border-radius: 12px;
  border: 1px solid var(--line); background: rgba(255,255,255,.6);
}
.hamburger span { display: block; width: 20px; height: 2px; background: var(--ink); border-radius: 2px; transition: .3s var(--ease); }
.hamburger span + span { margin-top: 5px; }
.header.menu-open .hamburger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.header.menu-open .hamburger span:nth-child(2) { opacity: 0; }
.header.menu-open .hamburger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  position: fixed; inset: 64px 0 0 0; z-index: 55;
  background: rgba(251,247,241,.97); -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px);
  padding: 22px; display: flex; flex-direction: column; gap: 6px;
  transform: translateY(-8px); opacity: 0; pointer-events: none; transition: .3s var(--ease);
}
.mobile-menu.open { transform: none; opacity: 1; pointer-events: auto; }
.mobile-menu a {
  font-size: 20px; font-weight: 700; padding: 14px 6px;
  border-bottom: 1px solid var(--line); min-height: 50px; display: flex; align-items: center;
}

/* ============================================================
   HERO
   ============================================================ */
.hero { position: relative; overflow: hidden; padding: 40px 0 56px; }
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: var(--grad-bubble);
}
.hero-wrap { display: grid; gap: 30px; align-items: center; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; font-weight: 700; padding: 6px 12px; border-radius: var(--pill);
  background: rgba(255,255,255,.7); border: 1px solid rgba(30,26,36,.08);
  color: var(--ink-2);
}
.stars { color: #ffb400; font-family: var(--font-en); letter-spacing: 1px; }
.hero h1 {
  font-size: 32px; font-weight: 800; line-height: 1.22;
}
.hero h1 .grad-text {
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .lead { color: var(--ink-2); font-size: 16px; margin-top: 14px; max-width: 520px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 22px; font-size: 13px; color: var(--ink-2); }
.hero-meta span { display: inline-flex; align-items: center; gap: 6px; }

.hero-visual { position: relative; }
.hero-visual .main-shot {
  border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow);
}
.hero-visual .main-shot img { aspect-ratio: 4 / 4.4; object-fit: cover; width: 100%; }
.float-card {
  position: absolute; padding: 12px 16px; border-radius: 16px;
  font-size: 13px; font-weight: 700; box-shadow: var(--shadow);
}
.float-card.top { top: 14px; right: -6px; }
.float-card.bottom { bottom: 18px; left: -6px; }
.float-card b { font-size: 18px; display: block; line-height: 1.1; }
.float-card small { color: var(--ink-2); font-weight: 600; font-size: 11px; }
.pulse-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--teal); display: inline-block; margin-right: 6px; animation: pulse 1.6s infinite; }

/* spec strip under hero */
.spec-strip { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin-top: 22px; }
.spec-chip {
  background: rgba(255,255,255,.7); border: 1px solid var(--line);
  border-radius: var(--radius-sm); padding: 14px 16px;
}
.spec-chip b { font-size: 18px; font-family: var(--font-en); color: var(--ink); display: block; }
.spec-chip span { font-size: 11.5px; color: var(--ink-2); font-weight: 600; }

/* ---------- icons (inline svg) ---------- */
.icon { width: 22px; height: 22px; flex: none; }

/* ============================================================
   TRUST BAR
   ============================================================ */
.trust {
  background: rgba(30,26,36,.03); border-block: 1px solid var(--line);
  padding: 18px 0; overflow: hidden;
}
.trust-track { display: flex; align-items: center; justify-content: space-around; gap: 18px; flex-wrap: wrap; }
.trust-item { display: flex; align-items: center; gap: 9px; font-size: 13px; font-weight: 700; color: var(--ink-2); white-space: nowrap; }
.trust-item .icon { width: 20px; height: 20px; color: var(--primary); }

/* ============================================================
   FEATURES (value cards)
   ============================================================ */
.features-grid { display: grid; gap: 16px; }
.feature-card { padding: 24px; display: flex; flex-direction: column; gap: 10px; position: relative; overflow: hidden; }
.feature-card::after {
  content: ""; position: absolute; inset: auto 0 0 0; height: 4px;
  background: var(--grad); opacity: 0; transition: opacity .3s var(--ease);
}
.feature-card:hover::after { opacity: 1; }
.feature-card .f-icon {
  width: 52px; height: 52px; border-radius: 16px; background: rgba(255,107,53,.12);
  display: grid; place-items: center; color: var(--primary);
}
.feature-card:nth-child(even) .f-icon { background: rgba(42,107,255,.10); color: var(--blue); }
.feature-card h3 { font-size: 19px; font-weight: 800; }
.feature-card p { color: var(--ink-2); font-size: 14.5px; }

/* ============================================================
   TECH / BONE CONDUCTION
   ============================================================ */
.tech { overflow: hidden; }
.tech-inner { display: grid; gap: 26px; align-items: center; background: linear-gradient(140deg,#fff,#fff9f1); border-radius: 24px; padding: 26px; }
.tech-inner img { border-radius: 18px; width: 100%; aspect-ratio: 1 / 1; object-fit: cover; }
.tech-points { display: grid; gap: 16px; margin-top: 18px; }
.tech-point { display: flex; gap: 14px; align-items: flex-start; }
.tech-point .n {
  width: 34px; height: 34px; border-radius: 12px; background: var(--grad);
  color: #fff; font-family: var(--font-en); font-weight: 700; display: grid; place-items: center; flex: none;
}
.tech-point h4 { font-size: 16.5px; font-weight: 800; }
.tech-point p { color: var(--ink-2); font-size: 14px; }

/* spec table */
.spec-table { width: 100%; border-collapse: collapse; margin-top: 8px; font-size: 14.5px; }
.spec-table tr { border-bottom: 1px solid var(--line); }
.spec-table tr:last-child { border-bottom: none; }
.spec-table th { text-align: left; font-weight: 600; color: var(--ink-2); padding: 12px 4px; width: 40%; }
.spec-table td { text-align: right; font-weight: 700; font-family: var(--font-en); padding: 12px 4px; }

/* ============================================================
   DETAILS / 360° gallery
   ============================================================ */
.gallery-grid { display: grid; gap: 14px; }
.gallery-item { border-radius: 18px; overflow: hidden; position: relative; box-shadow: var(--shadow); }
.gallery-item img { aspect-ratio: 1 / 1.05; object-fit: cover; width: 100%; }
.gallery-item figcaption {
  position: absolute; inset: auto 0 0 0; padding: 30px 14px 14px;
  background: linear-gradient(transparent, rgba(20,14,24,.55));
  color: #fff; font-size: 13px; font-weight: 700;
}
.gallery-item .tag {
  position: absolute; top: 12px; left: 12px; background: rgba(255,255,255,.85);
  color: var(--ink); font-size: 11px; font-weight: 700; padding: 5px 10px; border-radius: 999px;
}

/* ============================================================
   CERTIFICATIONS / experts
   ============================================================ */
.cert-grid { display: grid; gap: 14px; }
.cert-card { display: flex; gap: 14px; align-items: flex-start; padding: 18px; }
.cert-card .cert-badge {
  width: 46px; height: 46px; border-radius: 14px; background: rgba(42,107,255,.1);
  color: var(--blue); display: grid; place-items: center; flex: none;
}
.cert-card h4 { font-size: 16px; font-weight: 800; }
.cert-card p { font-size: 13.5px; color: var(--ink-2); margin-top: 4px; }

/* ============================================================
   REVIEWS
   ============================================================ */
.review-grid { display: grid; gap: 16px; }
.review-card { display: flex; flex-direction: column; gap: 10px; }
.review-card .rev-head { display: flex; align-items: center; gap: 11px; }
.avatar {
  width: 42px; height: 42px; border-radius: 50%; color: #fff; font-weight: 800;
  display: grid; place-items: center; font-family: var(--font-en);
}
.rev-head b { font-size: 14.5px; display: block; }
.rev-head small { color: var(--ink-3); font-size: 12px; }
.review-card .rev-txt { font-size: 14.5px; color: var(--ink-2); }
.verified { color: var(--blue); font-size: 11.5px; font-weight: 700; display: inline-flex; gap: 4px; align-items: center; }

/* ============================================================
   FAQ
   ============================================================ */
.faq-list { max-width: 720px; margin: 0 auto; display: grid; gap: 12px; }
.faq-item { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; }
.faq-q {
  width: 100%; display: flex; justify-content: space-between; align-items: center; gap: 14px;
  padding: 18px; text-align: left; font-size: 15.5px; font-weight: 700; min-height: 56px;
}
.faq-q .chev { flex: none; transition: transform .3s var(--ease); color: var(--primary); }
.faq-item.open .faq-q .chev { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .4s var(--ease); }
.faq-a p { padding: 0 18px 18px; color: var(--ink-2); font-size: 14.5px; }

/* ============================================================
   CTA / PURCHASE
   ============================================================ */
.purchase { position: relative; overflow: hidden; }
.purchase::before { content: ""; position: absolute; inset: 0; z-index: -1; background: var(--grad-bubble); }
.purchase-card {
  border-radius: 26px; padding: 30px 24px; text-align: center; position: relative; overflow: hidden;
}
.purchase-card .price-row { display: flex; align-items: baseline; justify-content: center; gap: 10px; margin: 18px 0 4px; }
.price-now { font-size: 40px; font-weight: 800; font-family: var(--font-en); }
.price-old { font-size: 18px; font-weight: 600; color: var(--ink-3); text-decoration: line-through; font-family: var(--font-en); }
.price-off {
  background: var(--primary); color: #fff; font-size: 13px; font-weight: 800;
  padding: 4px 11px; border-radius: 999px; font-family: var(--font-en);
}
.count-wrap { margin: 18px 0; }
.count-label { font-size: 13px; color: var(--ink-2); font-weight: 600; margin-bottom: 10px; }
.count { display: flex; justify-content: center; gap: 8px; }
.count .unit {
  background: var(--ink); color: #fff; border-radius: 12px; min-width: 52px;
  padding: 8px 4px; font-family: var(--font-en); font-weight: 700;
}
.count .unit b { display: block; font-size: 22px; }
.count .unit span { font-size: 10px; color: rgba(255,255,255,.7); }
.stock-bar { max-width: 320px; margin: 16px auto 0; text-align: left; font-size: 12.5px; color: var(--ink-2); font-weight: 600; }
.stock-bar .bar { height: 8px; border-radius: 999px; background: rgba(30,26,36,.08); overflow: hidden; margin-top: 8px; }
.stock-bar .fill { height: 100%; background: var(--grad); border-radius: 999px; }
.stock-bar .fill.urgent { background: linear-gradient(90deg, #ff6b35, #ff3d5a); }
.buy-row { display: grid; gap: 10px; margin-top: 20px; }
.buy-link { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 15px 20px; border-radius: var(--pill); font-weight: 800; font-size: 16px; min-height: 50px; }
.buy-link.grad { background: var(--grad); color: #fff; box-shadow: var(--shadow-soft); }
.buy-link.ghost { background: rgba(255,255,255,.7); border: 1.5px solid var(--line); }
.perks { display: flex; flex-wrap: wrap; justify-content: center; gap: 16px; margin-top: 20px; font-size: 13px; color: var(--ink-2); font-weight: 600; }

/* ============================================================
   FOOTER
   ============================================================ */
.footer { border-top: 1px solid var(--line); background: rgba(30,26,36,.02); padding: 40px 0 30px; }
.footer-grid { display: grid; gap: 22px; }
.footer h4 { font-size: 14px; font-weight: 800; margin-bottom: 12px; }
.footer ul { display: grid; gap: 8px; }
.footer a, .footer li { font-size: 13.5px; color: var(--ink-2); }
.footer a:hover { color: var(--ink); }
.footer-bottom { margin-top: 30px; padding-top: 18px; border-top: 1px solid var(--line); display: flex; flex-direction: column; gap: 10px; font-size: 12px; color: var(--ink-3); text-align: center; align-items: center; }

/* ============================================================
   LIVE CHAT FLOAT
   ============================================================ */
.chat-float { position: fixed; right: 18px; bottom: 18px; z-index: 80; display: flex; flex-direction: column; align-items: flex-end; gap: 10px; }
.chat-panel {
  width: min(320px, calc(100vw - 40px)); border-radius: 20px; overflow: hidden;
  box-shadow: var(--shadow); transform-origin: bottom right;
  transition: transform .3s var(--ease), opacity .3s var(--ease);
}
.chat-head { background: var(--grad); color: #fff; padding: 14px 16px; display: flex; align-items: center; gap: 10px; }
.chat-head .avatar { width: 34px; height: 34px; background: rgba(255,255,255,.2); font-size: 14px; }
.chat-head b { font-size: 14px; }
.chat-head small { color: rgba(255,255,255,.85); font-size: 11px; }
.chat-body { padding: 14px; display: grid; gap: 10px; background: #fff; }
.chat-actions { display: grid; gap: 8px; }
.chat-btn { display: flex; align-items: center; justify-content: center; gap: 8px; padding: 13px; border-radius: 14px; font-weight: 700; font-size: 14px; min-height: 46px; }
.chat-btn.kakao { background: #fee500; color: #3a1d1d; }
.chat-btn.line { background: #06c755; color: #fff; }
.chat-btn.whatsapp { background: #25d366; color: #fff; }
.chat-launcher {
  width: 58px; height: 58px; border-radius: 50%; background: var(--grad); color: #fff;
  display: grid; place-items: center; box-shadow: var(--shadow-soft); position: relative;
}
.chat-launcher::after {
  content: ""; position: absolute; inset: -6px; border-radius: 50%; border: 2px solid rgba(255,107,53,.4);
  animation: pulse-ring 2s infinite;
}
[hidden] { display: none !important; }

/* ============================================================
   MOTION / KEYFRAMES
   ============================================================ */
@keyframes pulse { 0%,100% { opacity: 1; transform: scale(1); } 50% { opacity: .4; transform: scale(.8); } }
@keyframes pulse-ring { 0% { transform: scale(.9); opacity: .8; } 100% { transform: scale(1.5); opacity: 0; } }
@keyframes floaty { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
.float-card { animation: floaty 4.5s var(--ease) infinite; }
.float-card.bottom { animation-delay: 1.2s; }

/* ============================================================
   RESPONSIVE (tablet & desktop)
   ============================================================ */
@media (min-width: 720px) {
  .nav-links { display: flex; }
  .hamburger { display: none; }
  .hero h1 { font-size: 44px; }
  .hero .lead { font-size: 17px; }
  .hero-wrap { grid-template-columns: 1.05fr .95fr; gap: 40px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { grid-template-columns: repeat(3, 1fr); }
  .cert-grid { grid-template-columns: repeat(3, 1fr); }
  .review-grid { grid-template-columns: repeat(3, 1fr); }
  .spec-strip { grid-template-columns: repeat(4, 1fr); }
  .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
  .tech-inner { grid-template-columns: .9fr 1.1fr; }
  .sec-head .h2 { font-size: 34px; }
  .float-card { padding: 14px 18px; }
  .float-card b { font-size: 20px; }
}
@media (min-width: 1024px) {
  .container { padding: 0 34px; }
  .section { padding: 88px 0; }
  .hero { padding: 60px 0 80px; }
  .features-grid { grid-template-columns: repeat(3, 1fr); }
  .nav { height: 72px; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  [data-reveal] { opacity: 1; transform: none; }
}