/* =========================================================================
   차량 배터리 방전일 계산기 — styles.css
   모티프: '심야 주차장에 홀로 선 차의 계기판'. 그래파이트 나이트 다크 테마,
   단일 액센트=충전 그린, 상태 3존(green/amber/red)은 SOC 게이지 기능색으로만 사용.
   ========================================================================= */

:root {
  /* 베이스 (순흑 금지, 쿨 차콜) */
  --bg: #0d0f13;
  --bg-2: #12151a;
  --surface: #1a1e26;
  --surface-2: #21262f;
  --border: rgba(255, 255, 255, 0.07);
  --border-strong: rgba(255, 255, 255, 0.14);

  /* 텍스트 */
  --text: #e7ebf0;
  --text-dim: #a7afbb;
  --text-faint: #6b7482;

  /* 단일 액센트 = 충전 그린/민트 */
  --accent: #3ddc97;
  --accent-dim: #2ba876;
  --accent-glow: rgba(61, 220, 151, 0.18);

  /* 상태 3존 (기능색: SOC/severity 전용) */
  --green: #3ddc97;
  --amber: #f5a623;
  --red: #ff5c5c;

  --radius: 12px;
  --radius-sm: 8px;

  --font-body: 'Pretendard', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Apple SD Gothic Neo', sans-serif;
  --font-head: 'Space Grotesk', 'Pretendard', 'Noto Sans KR', sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;

  --maxw: 940px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-body);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(61, 220, 151, 0.05), transparent 60%),
    var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- 상단 내비 ---- */
.top-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  background: rgba(13, 15, 19, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 15px;
  color: var(--text);
  letter-spacing: -0.02em;
}
.brand:hover { text-decoration: none; }
.brand svg { color: var(--accent); flex: none; }
.model-tag {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-faint);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 6px;
  letter-spacing: 0.06em;
}
.nav-links { display: flex; flex-wrap: wrap; gap: 4px; }
.nav-links a {
  color: var(--text-dim);
  font-size: 13.5px;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: background .15s, color .15s;
}
.nav-links a:hover { background: var(--surface); color: var(--text); text-decoration: none; }
.nav-links a.cta { color: var(--accent); }

/* 계기판 스캔라인 스트립 */
.cluster-strip {
  height: 3px;
  background: linear-gradient(90deg, var(--green) 0%, var(--green) 33%, var(--amber) 33%, var(--amber) 66%, var(--red) 66%, var(--red) 100%);
  opacity: 0.55;
}

/* ---- 레이아웃 ---- */
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 18px; }
.container.wide { max-width: 1120px; }
main.container { padding-top: 30px; padding-bottom: 60px; }

section { margin: 44px 0; }

/* ---- 히어로 ---- */
.hero { margin: 20px 0 34px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 30px;
  align-items: center;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 12px;
}
h1 {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(1.7rem, 5.2vw, 2.5rem);
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin: 0 0 14px;
  color: #fff;
}
.hero-lede { color: var(--text-dim); font-size: 1.02rem; margin: 0 0 20px; }
.hero-lede b { color: var(--text); font-weight: 600; }
.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #06231a;
  font-weight: 700;
  font-size: 14.5px;
  padding: 11px 20px;
  border-radius: var(--radius-sm);
  transition: transform .12s, box-shadow .12s;
  box-shadow: 0 6px 20px var(--accent-glow);
}
.hero-cta:hover { text-decoration: none; transform: translateY(-1px); box-shadow: 0 10px 28px var(--accent-glow); }

/* 히어로 비주얼: SOC 게이지 모티프 */
.hero-visual {
  background: linear-gradient(180deg, var(--surface) 0%, var(--bg-2) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  position: relative;
  overflow: hidden;
}
.hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 14px 14px;
  pointer-events: none;
}
.hv-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--text-faint);
  text-transform: uppercase;
  margin-bottom: 10px;
}
.hv-readout {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 2.7rem;
  font-weight: 500;
  color: var(--accent);
  line-height: 1;
}
.hv-readout small { font-size: 1rem; color: var(--text-dim); }
.hv-bar {
  margin-top: 16px;
  height: 14px;
  border-radius: 4px;
  background: var(--bg);
  border: 1px solid var(--border);
  overflow: hidden;
  position: relative;
}
.hv-bar span {
  display: block;
  height: 100%;
  width: 62%;
  background: linear-gradient(90deg, var(--accent-dim), var(--accent));
}
.hv-scale {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 9.5px;
  color: var(--text-faint);
  margin-top: 6px;
}

/* ---- 패널 / 계산기 ---- */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.panel-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-2);
}
.panel-head h2 {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 600;
  margin: 0;
  letter-spacing: -0.01em;
}
.panel-head .tag {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  border-radius: 5px;
  padding: 2px 7px;
}
.lamp {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
  flex: none;
}
.calc-body { padding: 18px; }

.field-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.field { display: flex; flex-direction: column; gap: 7px; }
.field.col-2 { grid-column: 1 / -1; }
.field > label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 8px;
}
.field .hint { font-weight: 400; color: var(--text-faint); font-size: 11.5px; }

select, input[type="number"] {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 11px 12px;
  font-family: var(--font-body);
  font-size: 15px;
  appearance: none;
  -webkit-appearance: none;
}
select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23a7afbb' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 34px;
  cursor: pointer;
}
select:focus, input:focus { outline: 2px solid var(--accent-dim); outline-offset: 1px; }

.direct[hidden] { display: none !important; }
.direct { display: flex; align-items: center; gap: 8px; }
.direct span { font-family: var(--font-mono); font-size: 13px; color: var(--text-dim); }

/* 세그먼트 버튼 (연식·계절) */
.segbtns { display: flex; flex-wrap: wrap; gap: 6px; }
.segbtns button {
  flex: 1 1 auto;
  min-width: 62px;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  color: var(--text-dim);
  border-radius: var(--radius-sm);
  padding: 9px 8px;
  font-family: var(--font-body);
  font-size: 13.5px;
  cursor: pointer;
  transition: border-color .12s, color .12s, background .12s;
}
.segbtns button small { display: block; font-size: 10px; color: var(--text-faint); margin-top: 2px; }
.segbtns button:hover { border-color: var(--border-strong); color: var(--text); }
.segbtns button.active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(61, 220, 151, 0.08);
}
.segbtns button.active small { color: var(--accent-dim); }

/* 슬라이더 (dark-current) */
.slider-wrap { display: flex; flex-direction: column; gap: 8px; }
.slider-head { display: flex; justify-content: space-between; align-items: baseline; }
.slider-head #mAValue {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.3rem;
  color: var(--accent);
  font-weight: 500;
}
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--amber) 65%, var(--red) 100%);
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--accent);
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0,0,0,.5);
}
input[type="range"]::-moz-range-thumb {
  width: 20px; height: 20px; border-radius: 50%;
  background: #fff; border: 3px solid var(--accent); cursor: pointer;
}
.slider-scale { display: flex; justify-content: space-between; font-family: var(--font-mono); font-size: 10px; color: var(--text-faint); }

/* ---- 결과 ---- */
.result {
  margin-top: 22px;
  border-top: 1px dashed var(--border-strong);
  padding-top: 22px;
}
.readout {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}
.readout .days {
  font-size: clamp(3.6rem, 15vw, 5.4rem);
  font-weight: 600;
  line-height: 0.95;
  color: var(--accent);
  text-shadow: 0 0 30px var(--accent-glow);
}
.readout .unit { font-size: 1.6rem; color: var(--text-dim); font-weight: 500; }
.result-primary { text-align: center; font-size: 1.05rem; font-weight: 600; margin: 6px 0 2px; color: var(--text); }

/* 상태별 리드아웃 색 (기능색) */
[data-status="amber"] .readout .days { color: var(--amber); text-shadow: 0 0 30px rgba(245,166,35,.18); }
[data-status="red"] .readout .days { color: var(--red); text-shadow: 0 0 30px rgba(255,92,92,.2); }

/* SOC 게이지 바 */
.gauge {
  position: relative;
  margin: 20px 0 12px;
  height: 20px;
  border-radius: 5px;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  overflow: hidden;
}
.gauge-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-dim), var(--accent));
  transition: width .6s cubic-bezier(.22,.61,.36,1);
}
[data-status="amber"] .gauge-fill { background: linear-gradient(90deg, #c07d12, var(--amber)); }
[data-status="red"] .gauge-fill { background: linear-gradient(90deg, #b53838, var(--red)); }
.gauge-zones {
  position: absolute; inset: 0;
  display: flex; pointer-events: none;
}
.gauge-zones span { flex: 1; border-right: 1px solid var(--border); }
.gauge-zones span:last-child { border-right: none; }
.gauge-scale { display: flex; justify-content: space-between; font-family: var(--font-mono); font-size: 10px; color: var(--text-faint); margin-top: 4px; }

.status-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  padding: 5px 12px;
  border-radius: 20px;
  border: 1px solid;
  margin: 4px 0;
}
[data-status="green"] .status-badge { color: var(--green); border-color: var(--accent-dim); background: rgba(61,220,151,.08); }
[data-status="amber"] .status-badge { color: var(--amber); border-color: #7a5410; background: rgba(245,166,35,.09); }
[data-status="red"] .status-badge { color: var(--red); border-color: #7a2b2b; background: rgba(255,92,92,.09); }

.result-action {
  text-align: center;
  color: var(--text);
  font-size: 0.98rem;
  margin: 10px 0;
}
.result-basis {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--text-faint);
  text-align: center;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 9px 12px;
  margin: 12px 0;
  line-height: 1.6;
}
.result-basis .op { color: var(--text-dim); }
.disclaimer-inline {
  font-size: 12px;
  color: var(--text-faint);
  line-height: 1.6;
  margin: 12px 0 0;
  border-top: 1px solid var(--border);
  padding-top: 12px;
}

/* 쿠팡 링크 */
.cp-links { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin: 16px 0 4px; }
.cp-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: var(--accent);
  color: #06231a;
  font-weight: 700;
  font-size: 14px;
  padding: 11px 18px;
  border-radius: var(--radius-sm);
  transition: transform .12s, box-shadow .12s;
}
.cp-link::before { content: "🛒"; font-size: 14px; }
.cp-link:hover { text-decoration: none; transform: translateY(-1px); box-shadow: 0 6px 18px var(--accent-glow); }
.cp-link.sec { background: transparent; color: var(--accent); border: 1px solid var(--accent-dim); }
.cp-link.sec::before { content: "🔌"; }
.cp-note { text-align: center; font-size: 11.5px; color: var(--text-faint); margin: 6px 0 0; }

/* ---- 섹션 타이틀 ---- */
.section-title {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 18px;
}
.section-title .num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  border-radius: 5px;
  padding: 2px 8px;
  flex: none;
}
.section-title h2 {
  font-family: var(--font-head);
  font-size: 1.2rem;
  font-weight: 600;
  margin: 0;
  letter-spacing: -0.02em;
}
.section-title .ln { flex: 1; height: 1px; background: var(--border); }

/* ---- WHY-DIFFERENT 3셀 ---- */
.why-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 14px;
}
.why-cell {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
}
.why-cell .wc-n {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.08em;
}
.why-cell h3 { font-family: var(--font-head); font-size: 1.05rem; margin: 6px 0 8px; font-weight: 600; }
.why-cell p { margin: 0; color: var(--text-dim); font-size: 0.94rem; }

/* ---- 체크리스트 / 팁 카드 ---- */
.check-list, .tip-list {
  display: grid;
  gap: 12px;
}
.tip-list { grid-template-columns: repeat(3, 1fr); }
.check-list { grid-template-columns: repeat(3, 1fr); }
.check-item, .tip-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}
.check-item .ci-ico, .tip-card .tc-ico {
  color: var(--accent);
  margin-bottom: 8px;
}
.check-item h4, .tip-card h4 { font-family: var(--font-head); font-size: 0.98rem; margin: 0 0 6px; font-weight: 600; }
.check-item p, .tip-card p { margin: 0; color: var(--text-dim); font-size: 0.9rem; }
.tip-card .cp-link { margin-top: 12px; font-size: 12.5px; padding: 8px 13px; }

/* ---- 정보 카드 (암전류 정상범위 등) ---- */
.info-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.info-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}
.info-card .ic-v {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--accent);
}
.info-card .ic-k { font-size: 12px; color: var(--text-dim); margin-top: 4px; }
.info-card.warn .ic-v { color: var(--red); }

/* ---- 본문 산문 ---- */
.prose { max-width: 100%; }
.prose h2 {
  font-family: var(--font-head);
  font-size: 1.28rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 32px 0 12px;
  color: #fff;
}
.prose h3 { font-family: var(--font-head); font-size: 1.08rem; margin: 22px 0 8px; font-weight: 600; }
.prose p { margin: 0 0 14px; color: var(--text-dim); }
.prose p b, .prose p strong { color: var(--text); font-weight: 600; }
.prose ul, .prose ol { color: var(--text-dim); padding-left: 22px; margin: 0 0 16px; }
.prose li { margin-bottom: 7px; }
.prose .src {
  font-size: 12.5px;
  color: var(--text-faint);
  border-left: 2px solid var(--border-strong);
  padding-left: 12px;
  margin-top: 18px;
}

/* 코드/공식 블록 */
.formula-block {
  font-family: var(--font-mono);
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  color: var(--accent);
  font-size: 14px;
  overflow-x: auto;
  margin: 0 0 16px;
  line-height: 1.9;
}
.formula-block .cmt { color: var(--text-faint); }

/* 표 */
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 0 0 16px; }
table.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 480px;
}
table.data-table th, table.data-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  text-align: left;
}
table.data-table thead th {
  background: var(--bg-2);
  color: var(--text-dim);
  font-weight: 600;
  font-size: 12.5px;
}
table.data-table td { color: var(--text-dim); }
table.data-table td.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; color: var(--text); }
table.data-table tbody tr:hover { background: rgba(255,255,255,0.02); }

/* ---- 내부 링크 카드 ---- */
.linkcards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.linkcard {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  transition: border-color .15s, transform .12s;
}
.linkcard:hover { text-decoration: none; border-color: var(--accent-dim); transform: translateY(-2px); }
.lc-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--accent);
}
.linkcard h3 { font-family: var(--font-head); font-size: 1rem; margin: 6px 0 5px; color: var(--text); font-weight: 600; }
.linkcard p { margin: 0; color: var(--text-dim); font-size: 0.88rem; }

/* ---- FAQ 아코디언 ---- */
.faq-list details, .prose details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 10px;
  overflow: hidden;
}
.faq-list summary, .prose details summary {
  cursor: pointer;
  padding: 15px 18px;
  font-weight: 600;
  font-size: 0.98rem;
  list-style: none;
  display: flex;
  gap: 10px;
  align-items: flex-start;
  color: var(--text);
}
.faq-list summary::-webkit-details-marker, .prose summary::-webkit-details-marker { display: none; }
.faq-list summary .q, .prose summary .q {
  font-family: var(--font-mono);
  color: var(--accent);
  flex: none;
  font-size: 13px;
}
.faq-list details[open] summary, .prose details[open] summary { border-bottom: 1px solid var(--border); }
.faq-list .fa, .prose details .fa { padding: 14px 18px; color: var(--text-dim); font-size: 0.95rem; }
.faq-list .fa a, .prose details .fa a { color: var(--accent); }

/* 미리보기 표 강조 프리셋 노트 */
.preview-note {
  font-size: 12.5px;
  color: var(--text-faint);
  margin-top: 8px;
}

/* ---- 페이지 헤더 (서브·privacy) ---- */
.page-header { margin: 20px 0 30px; }
.page-header .sub { color: var(--text-dim); margin: 0; }

/* ---- 푸터 ---- */
footer {
  border-top: 1px solid var(--border);
  background: var(--bg-2);
  margin-top: 50px;
  padding: 34px 0 26px;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.footer-col h4 {
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin: 0 0 10px;
}
.footer-col a {
  display: block;
  color: var(--text-dim);
  font-size: 13.5px;
  padding: 3px 0;
}
.footer-col a:hover { color: var(--accent); text-decoration: none; }
.footer-bottom {
  margin-top: 26px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  color: var(--text-faint);
  font-size: 12.5px;
}
.footer-bottom p { margin: 4px 0; }
.footer-plate { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.06em; }
.footer-plate a { color: var(--text-dim); }

/* ---- 반응형 ---- */
@media (max-width: 780px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { order: -1; }
  .why-grid { grid-template-columns: 1fr; }
  .tip-list, .check-list { grid-template-columns: 1fr; }
  .info-cards { grid-template-columns: 1fr 1fr; }
  .linkcards { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
  .field-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .info-cards { grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
  .gauge-fill { transition: none !important; }
}