/* ===== Tokens ===== */
:root {
  --bg: #07080b;
  --bg-2: #0d0f14;
  --panel: #12151c;
  --line: #1f2430;
  --text: #eef1f6;
  --muted: #9aa3b2;
  --accent: #e5322d;
  --accent-2: #ff6a4d;
  --glow: rgba(229, 50, 45, .35);
  --radius: 16px;
  --maxw: 1120px;
  --header-h: 64px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
body {
  background: var(--bg);
  color: var(--text);
  font-family: "Pretendard", "Noto Sans KR", system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
ol { list-style: none; }
.sr-only {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}
:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 3px; border-radius: 6px; }

/* ===== Header ===== */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 clamp(16px, 4vw, 40px);
  transition: background .3s, backdrop-filter .3s, border-color .3s;
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: rgba(7, 8, 11, .78);
  backdrop-filter: blur(12px);
  border-bottom-color: var(--line);
}
.brand { font-weight: 800; letter-spacing: .28em; font-size: 15px; }
.brand span {
  margin-left: .6em; font-size: 10px; letter-spacing: .2em;
  padding: 2px 7px; border: 1px solid var(--accent); color: var(--accent-2); border-radius: 4px;
  vertical-align: middle;
}
.nav { display: flex; gap: 28px; font-size: 14px; color: var(--muted); }
.nav a { position: relative; padding: 6px 0; transition: color .2s; }
.nav a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 0;
  background: var(--accent); transition: width .25s;
}
.nav a:hover, .nav a.active, .nav a[aria-current="page"] { color: var(--text); }
.nav a:hover::after, .nav a.active::after, .nav a[aria-current="page"]::after { width: 100%; }
.nav a[aria-current="page"] { font-weight: 700; }

.menu-btn { display: none; background: none; border: 0; width: 40px; height: 40px; cursor: pointer; }
.menu-btn span {
  display: block; width: 22px; height: 2px; background: var(--text);
  margin: 5px auto; transition: transform .25s, opacity .25s;
}
.menu-btn[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-btn[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-btn[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Hero ===== */
.hero {
  position: relative; min-height: 100svh; overflow: hidden;
  display: grid; place-items: center; text-align: center;
  padding: calc(var(--header-h) + 24px) 20px 120px;
  background:
    radial-gradient(1000px 520px at 50% 62%, rgba(229, 50, 45, .22), transparent 65%),
    linear-gradient(#050608, #0a0c11 55%, #07080b);
}
.road { position: absolute; inset: 0; pointer-events: none; perspective: 520px; }
.horizon {
  position: absolute; left: 0; right: 0; top: 56%; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-2), transparent);
  box-shadow: 0 0 40px 8px var(--glow);
}
.lines {
  position: absolute; left: 50%; top: 56%; width: 160%; height: 60%;
  transform: translateX(-50%) rotateX(68deg); transform-origin: top center;
  background:
    repeating-linear-gradient(90deg, transparent 0 calc(12.5% - 1px), rgba(255,255,255,.07) calc(12.5% - 1px) 12.5%),
    linear-gradient(#0f1218, #07080b);
  overflow: hidden;
}
.lines i {
  position: absolute; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, rgba(255,106,77,.8), transparent);
  animation: roadMove 2.4s linear infinite;
}
.lines i:nth-child(2) { animation-delay: -.48s; }
.lines i:nth-child(3) { animation-delay: -.96s; }
.lines i:nth-child(4) { animation-delay: -1.44s; }
.lines i:nth-child(5) { animation-delay: -1.92s; }
@keyframes roadMove { from { top: -4%; } to { top: 104%; } }

.streaks b {
  position: absolute; top: 40%; height: 2px; width: 22vw; opacity: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.7), transparent);
  animation: streak 3.2s ease-in infinite;
}
.streaks b:nth-child(1) { left: -25%; top: 36%; animation-delay: .1s; }
.streaks b:nth-child(2) { left: -25%; top: 44%; animation-delay: 1.0s; }
.streaks b:nth-child(3) { left: -25%; top: 50%; animation-delay: 2.0s; }
.streaks b:nth-child(4) { left: -25%; top: 40%; animation-delay: 2.6s; }
.streaks b:nth-child(5) { left: -25%; top: 47%; animation-delay: 1.6s; }
.streaks b:nth-child(6) { left: -25%; top: 53%; animation-delay: .6s; }
@keyframes streak {
  0% { transform: translateX(0); opacity: 0; }
  15% { opacity: .9; }
  100% { transform: translateX(520%); opacity: 0; }
}

.hero-text { position: relative; z-index: 2; width: 100%; max-width: 1100px; }
.eyebrow {
  font-size: 12px; letter-spacing: .32em; color: var(--accent-2);
  font-weight: 700; margin-bottom: 14px;
}
.hero h1 {
  font-size: clamp(44px, 11vw, 140px); line-height: 1; letter-spacing: .06em;
  font-weight: 900; padding-inline: .06em; /* 글자 사이 간격 때문에 끝 글자가 잘리지 않게 */
  background: linear-gradient(180deg, #fff 20%, #8d95a5 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 0 30px rgba(229, 50, 45, .25));
}
.hero-car { width: min(860px, 100%); margin: clamp(12px, 3vw, 36px) auto 0; }
.hero-car img {
  display: block; width: 100%; height: auto;
  filter: drop-shadow(0 18px 40px rgba(0, 0, 0, .6));
}
.hero-car figcaption { font-size: 11px; color: var(--muted); opacity: .7; margin-top: -4px; }
.lead { margin: 18px 0 32px; color: var(--muted); font-size: clamp(15px, 2.2vw, 19px); }
.cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 13px 28px; border-radius: 999px; font-weight: 700; font-size: 15px;
  border: 1px solid transparent; transition: transform .2s, box-shadow .2s, background .2s;
}
.btn.primary { background: var(--accent); box-shadow: 0 8px 30px var(--glow); }
.btn.primary:hover { transform: translateY(-2px); background: #ff4640; }
.btn.ghost { border-color: #3a4152; color: var(--text); }
.btn.ghost:hover { border-color: var(--text); transform: translateY(-2px); }

.scroll-hint {
  position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%);
  font-size: 11px; letter-spacing: .3em; color: var(--muted); z-index: 2;
}
.scroll-hint::after {
  content: ""; display: block; width: 1px; height: 34px; margin: 10px auto 0;
  background: linear-gradient(var(--muted), transparent); animation: hint 1.8s ease-in-out infinite;
}
@keyframes hint { 0%,100% { transform: scaleY(.4); transform-origin: top; } 50% { transform: scaleY(1); } }

/* ===== Sections ===== */
.section { padding: clamp(72px, 11vw, 140px) 20px; }
.section.dark { background: var(--bg-2); border-block: 1px solid var(--line); }
.container { max-width: var(--maxw); margin: 0 auto; }
.container.narrow { max-width: 760px; }
.section h1, .section h2 {
  font-size: clamp(30px, 5vw, 52px); font-weight: 800; letter-spacing: -.01em; margin-bottom: 36px;
}
.section .eyebrow { margin-bottom: 10px; }
.sub { color: var(--muted); margin: -16px 0 32px; }

/* ===== 하위 페이지 ===== */
.page-section {
  min-height: calc(100svh - 140px);
  padding-top: calc(var(--header-h) + clamp(48px, 8vw, 96px));
  background:
    radial-gradient(800px 360px at 85% 0%, rgba(229, 50, 45, .12), transparent 70%),
    var(--bg);
}

/* 페이지 전환 효과: 새 페이지 내용이 살짝 떠오르며 나타남 */
main { animation: pageIn .45s ease both; }
@keyframes pageIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

/* ===== Cards ===== */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; }
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 24px; transition: transform .25s, border-color .25s, box-shadow .25s;
}
.card:hover { transform: translateY(-6px); border-color: var(--accent); box-shadow: 0 16px 40px -18px var(--glow); }
.card .icon { font-size: 30px; margin-bottom: 14px; }
.card h3 { font-size: 19px; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 15px; }
.cards-5 { grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); }
.link-card { display: flex; flex-direction: column; }
.link-card p { flex: 1; }
.link-card .go { margin-top: 18px; font-size: 14px; font-weight: 700; color: var(--accent-2); transition: transform .2s; }
.link-card:hover .go { transform: translateX(4px); }

/* ===== Official video ===== */
.video {
  position: relative; aspect-ratio: 16 / 9; border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line); background: #000;
}
.video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.video-play {
  position: absolute; inset: 0; width: 100%; border: 0; cursor: pointer; color: var(--text);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 18px;
  background:
    radial-gradient(600px 300px at 50% 60%, rgba(229, 50, 45, .28), transparent 70%),
    repeating-linear-gradient(90deg, transparent 0 59px, rgba(255,255,255,.035) 59px 60px),
    linear-gradient(#0b0d12, #050608);
  font: inherit;
}
.play-icon {
  width: 84px; height: 84px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 0 10px rgba(229, 50, 45, .18), 0 12px 40px var(--glow);
  position: relative; transition: transform .2s;
}
.play-icon::after {
  content: ""; position: absolute; left: 34px; top: 26px;
  border-style: solid; border-width: 16px 0 16px 26px; border-color: transparent transparent transparent #fff;
}
.video-play:hover .play-icon, .video-play:focus-visible .play-icon { transform: scale(1.08); }
.video-meta { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.video-meta strong { font-size: 20px; }
.video-meta span { color: var(--muted); font-size: 14px; }
.video-links { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 20px; }

/* ===== Stats & Table ===== */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 18px; margin-bottom: 48px; }
.stat { border-top: 2px solid var(--accent); padding: 18px 4px 0; }
.num { font-size: clamp(38px, 6vw, 60px); font-weight: 900; line-height: 1.1; font-variant-numeric: tabular-nums; }
.num em { font-style: normal; color: var(--accent-2); }
.unit { color: var(--muted); font-size: 14px; margin-top: 6px; }

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
table { width: 100%; border-collapse: collapse; min-width: 540px; }
th, td { text-align: left; padding: 15px 20px; border-bottom: 1px solid var(--line); font-size: 15px; }
thead th { color: var(--muted); font-size: 12px; letter-spacing: .14em; background: rgba(255,255,255,.02); }
tbody th { font-weight: 700; white-space: nowrap; }
tbody tr:last-child th, tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: rgba(255,255,255,.025); }
.tag {
  display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: 12px; font-weight: 700;
  border: 1px solid; white-space: nowrap;
}
.tag.claim { color: #ffb347; border-color: #ffb34766; }
.tag.report { color: #6fd3a0; border-color: #6fd3a066; }
.tag.est { color: #6cb6ff; border-color: #6cb6ff66; }
.tag.none { color: var(--muted); border-color: #3a4152; }
.note { color: var(--muted); font-size: 13px; margin-top: 16px; }

/* ===== Charging calculator ===== */
.calc { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }
.bar { height: 22px; border-radius: 999px; background: #0a0c11; border: 1px solid var(--line); overflow: hidden; position: relative; }
.bar-fill {
  position: absolute; top: 0; bottom: 0; left: 15%; width: 70%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 20px var(--glow); border-radius: 999px;
  transition: left .15s, width .15s;
}
.sliders { display: grid; grid-template-columns: 110px 1fr; gap: 14px 16px; align-items: center; margin: 26px 0; }
.sliders label { color: var(--muted); font-size: 14px; }
.sliders output { color: var(--text); font-weight: 800; }
input[type="range"] {
  -webkit-appearance: none; appearance: none; width: 100%; height: 6px; border-radius: 999px;
  background: #232938; outline-offset: 6px; cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 22px; height: 22px; border-radius: 50%;
  background: var(--accent); border: 3px solid #fff; box-shadow: 0 0 14px var(--glow);
}
input[type="range"]::-moz-range-thumb {
  width: 18px; height: 18px; border-radius: 50%; background: var(--accent); border: 3px solid #fff;
}
.result { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; border-top: 1px solid var(--line); padding-top: 20px; }
.result-label { color: var(--muted); }
.result strong { font-size: clamp(28px, 5vw, 40px); color: var(--accent-2); }

/* ===== Timeline ===== */
.timeline { position: relative; padding-left: 34px; }
.timeline::before { content: ""; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 2px; background: var(--line); }
.timeline li { position: relative; padding-bottom: 34px; }
.timeline li:last-child { padding-bottom: 0; }
.timeline li::before {
  content: ""; position: absolute; left: -34px; top: 8px; width: 16px; height: 16px; border-radius: 50%;
  background: var(--bg-2); border: 3px solid var(--accent); box-shadow: 0 0 0 4px rgba(229,50,45,.12);
}
.timeline time { color: var(--accent-2); font-weight: 800; letter-spacing: .08em; font-size: 14px; }
.timeline h3 { margin: 2px 0 4px; font-size: 20px; }
.timeline p { color: var(--muted); }

/* ===== FAQ ===== */
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  list-style: none; cursor: pointer; padding: 20px 4px; font-weight: 700; font-size: 17px;
  display: flex; justify-content: space-between; gap: 16px; align-items: center;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 26px; color: var(--accent-2); transition: transform .25s; line-height: 1; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { color: var(--muted); padding: 0 4px 22px; }

/* ===== Footer ===== */
.footer { text-align: center; padding: 44px 20px 56px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
.footer p + p { margin-top: 8px; }
.footer .small { font-size: 12px; opacity: .7; }

/* ===== Reveal on scroll ===== */
.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.js .reveal.in { opacity: 1; transform: none; }

/* ===== Responsive ===== */
@media (max-width: 760px) {
  .menu-btn { display: block; }
  .nav {
    position: fixed; top: var(--header-h); left: 0; right: 0; flex-direction: column; gap: 0;
    background: rgba(7, 8, 11, .96); backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--line);
    max-height: 0; overflow: hidden; transition: max-height .3s ease;
  }
  .nav.open { max-height: 320px; }
  .nav a { padding: 16px 24px; border-top: 1px solid var(--line); }
  .nav a::after { display: none; }
  .nav a[aria-current="page"] { box-shadow: inset 3px 0 0 var(--accent); background: rgba(229, 50, 45, .08); }
  .sliders { grid-template-columns: 1fr; }
  .calc { padding: 22px 18px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js .reveal { opacity: 1; transform: none; }
}