/* ============================================================================
 * 스마트폰 저장용량 계산기 — styles.css
 * DESIGN: 저장장치 섹터 할당 콘솔. 따뜻한 그래파이트 베이스 + 단일 하이비스
 * 앰버 액센트 + 모노스페이스 수치. 디스크 조각모음풍 섹터 맵 · 세그먼트 게이지.
 * ========================================================================== */

:root {
  /* base — warm graphite / paper */
  --ink: #16150F;
  --ink-2: #24221A;
  --paper: #F4F1EA;
  --paper-2: #ECE7DB;
  --card: #FFFFFF;
  --line: #D9D3C6;
  --line-strong: #C3BBA9;
  --text: #24221A;
  --text-mute: #6E685A;
  --text-faint: #938C7C;
  /* single locked accent */
  --amber: #F2A400;
  --amber-deep: #C98600;
  --amber-soft: #FBEDC9;
  /* category data colors */
  --c-photos: #3E9C8F;
  --c-video: #C9683E;
  --c-apps: #A98B3C;
  --c-system: #6B7280;
  --c-free: #C3BBA9;
  --ok: #3E9C8F;
  --warn: #C9683E;

  --radius: 3px;
  --radius-lg: 5px;
  --shadow: 0 1px 0 rgba(0,0,0,.03), 0 6px 22px -14px rgba(20,18,10,.35);
  --mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;
  --display: 'Space Grotesk', 'IBM Plex Sans KR', system-ui, sans-serif;
  --body: 'IBM Plex Sans KR', system-ui, -apple-system, sans-serif;
  --maxw: 1080px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #0F0E0A;
    --ink-2: #1B1A13;
    --paper: #16150F;
    --paper-2: #1D1B14;
    --card: #201E16;
    --line: #34311F;
    --line-strong: #45412C;
    --text: #EDE8DA;
    --text-mute: #B0A992;
    --text-faint: #837C68;
    --amber-soft: #3A2E10;
    --c-free: #45412C;
    --shadow: 0 6px 24px -16px rgba(0,0,0,.7);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--body);
  background: var(--paper);
  color: var(--text);
  line-height: 1.72;
  font-size: 16px;
  overflow-x: hidden;
}
img { max-width: 100%; }
a { color: var(--amber-deep); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { font-family: var(--display); font-weight: 600; line-height: 1.2; letter-spacing: -.01em; }

/* ---------- nav ---------- */
.top-nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; flex-wrap: wrap;
  padding: 12px 20px;
  background: var(--ink);
  color: var(--paper);
  border-bottom: 2px solid var(--amber);
}
.top-nav .brand {
  display: inline-flex; align-items: center; gap: 9px;
  color: var(--paper); font-family: var(--display); font-weight: 600; font-size: 1.02rem;
}
.top-nav .brand:hover { text-decoration: none; }
.brand .mk { display: inline-block; width: 22px; height: 22px; }
.model-tag {
  font-family: var(--mono); font-size: .62rem; letter-spacing: .08em;
  color: var(--ink); background: var(--amber); padding: 2px 6px; border-radius: 2px;
}
.nav-links { display: flex; gap: 4px; flex-wrap: wrap; }
.nav-links a {
  color: var(--paper); font-size: .84rem; padding: 6px 10px; border-radius: 2px;
  opacity: .82;
}
.nav-links a:hover { opacity: 1; background: rgba(255,255,255,.08); text-decoration: none; }
.nav-links a.cta { background: var(--amber); color: var(--ink); opacity: 1; font-weight: 600; }

.ruler-strip {
  height: 8px;
  background-image: repeating-linear-gradient(90deg, var(--line-strong) 0 1px, transparent 1px 24px);
  background-color: var(--paper-2);
  border-bottom: 1px solid var(--line);
}

/* ---------- layout ---------- */
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
main.container { padding-bottom: 56px; }
section { margin-top: 34px; }

.hero { padding: 40px 0 8px; }
.eyebrow {
  font-family: var(--mono); font-size: .72rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--amber-deep); margin: 0 0 10px;
}
.hero h1 { font-size: clamp(1.7rem, 5vw, 2.5rem); margin: 0 0 12px; }
.hero-lede { font-size: 1.05rem; color: var(--text-mute); max-width: 60ch; margin: 0; }
.hero-lede b { color: var(--text); }

.page-header { padding: 40px 0 10px; }
.page-header h1 { font-size: clamp(1.6rem, 5vw, 2.2rem); margin: 0 0 10px; }
.page-header .sub { color: var(--text-mute); margin: 0; max-width: 62ch; }

/* ---------- panels / cards ---------- */
.panel {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius-lg); box-shadow: var(--shadow); overflow: hidden;
}
.panel-head {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 16px; background: var(--ink-2); color: var(--paper);
  border-bottom: 1px solid var(--line);
}
.panel-head h2 { font-size: 1rem; margin: 0; color: var(--paper); }
.panel-head .stud {
  width: 9px; height: 9px; border-radius: 50%; background: var(--amber);
  box-shadow: 0 0 0 3px rgba(242,164,0,.2);
}
.panel-head .tag {
  margin-left: auto; font-family: var(--mono); font-size: .62rem; letter-spacing: .1em;
  color: var(--amber); border: 1px solid var(--amber-deep); padding: 2px 6px; border-radius: 2px;
}
.calc-body { padding: 18px 16px 20px; }

/* ---------- inputs ---------- */
.field-block { margin-top: 18px; }
.field-block:first-child { margin-top: 0; }
.field-label {
  display: flex; align-items: baseline; gap: 8px; margin-bottom: 8px;
  font-weight: 600; font-size: .92rem;
}
.field-label .hint { font-weight: 400; font-size: .78rem; color: var(--text-faint); }

.seg-toggle, .chip-row { display: flex; flex-wrap: wrap; gap: 8px; }
.seg-toggle button, .chip {
  font-family: var(--body); font-size: .9rem; cursor: pointer;
  background: var(--paper-2); color: var(--text); border: 1px solid var(--line-strong);
  border-radius: var(--radius); padding: 9px 14px; transition: all .12s;
}
.seg-toggle button small { display: block; font-size: .68rem; color: var(--text-faint); font-weight: 400; }
.chip { font-family: var(--mono); font-weight: 500; }
.seg-toggle button.active, .chip.active {
  background: var(--amber); color: var(--ink); border-color: var(--amber-deep); font-weight: 600;
}
.seg-toggle button.active small, .chip.active small { color: var(--ink); }
.seg-toggle button:hover, .chip:hover { border-color: var(--amber-deep); }

select, input[type="number"] {
  font-family: var(--body); font-size: .95rem; color: var(--text);
  background: var(--card); border: 1px solid var(--line-strong);
  border-radius: var(--radius); padding: 9px 11px; width: 100%;
}
select:focus, input:focus { outline: 2px solid var(--amber); outline-offset: -1px; border-color: var(--amber); }

.slider-row { display: flex; align-items: center; gap: 14px; }
.slider-row input[type="range"] { flex: 1; accent-color: var(--amber); height: 26px; }
.slider-val {
  font-family: var(--mono); font-weight: 600; font-size: 1.02rem; min-width: 6.5ch; text-align: right;
  color: var(--amber-deep); white-space: nowrap;
}
.subgrid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 560px) { .subgrid { grid-template-columns: 1fr; } }

/* ---------- results ---------- */
.result-wrap {
  display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 22px;
  margin-top: 8px;
}
@media (max-width: 760px) { .result-wrap { grid-template-columns: 1fr; } }

.donut-card { text-align: center; }
.donut { width: 100%; max-width: 260px; height: auto; margin: 0 auto; display: block; }
.donut-center-num { font-family: var(--mono); font-weight: 700; }
.legend { display: flex; flex-wrap: wrap; gap: 6px 14px; justify-content: center; margin-top: 12px; }
.legend span { display: inline-flex; align-items: center; gap: 6px; font-size: .8rem; color: var(--text-mute); }
.legend i { width: 11px; height: 11px; border-radius: 2px; display: inline-block; }

/* sector allocation map */
.sector-head {
  display: flex; justify-content: space-between; align-items: baseline;
  font-family: var(--mono); font-size: .7rem; letter-spacing: .08em; text-transform: uppercase;
  color: var(--text-faint); margin-bottom: 7px;
}
.sector-map {
  display: grid; grid-template-columns: repeat(20, 1fr); gap: 2px;
  padding: 8px; background: var(--paper-2); border: 1px solid var(--line); border-radius: var(--radius);
}
.sector-map i {
  aspect-ratio: 1 / 1; border-radius: 1px; background: var(--c-free);
  transition: background .35s;
}
.sector-map i.s-system { background: var(--c-system); }
.sector-map i.s-photos { background: var(--c-photos); }
.sector-map i.s-video { background: var(--c-video); }
.sector-map i.s-apps { background: var(--c-apps); }
.sector-map i.s-over { background: var(--amber); }

/* odometer readouts */
.odo-list { display: grid; gap: 10px; margin-top: 4px; }
.odo {
  display: flex; align-items: baseline; justify-content: space-between; gap: 10px;
  padding: 11px 14px; background: var(--paper-2); border: 1px solid var(--line);
  border-left: 3px solid var(--amber); border-radius: var(--radius);
}
.odo .odo-label { font-size: .84rem; color: var(--text-mute); }
.odo .odo-num { font-family: var(--mono); font-weight: 700; font-size: 1.5rem; color: var(--text); font-variant-numeric: tabular-nums; }
.odo .odo-unit { font-family: var(--mono); font-size: .82rem; color: var(--text-faint); margin-left: 3px; }

/* recommendation cards */
.tier-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 6px; }
@media (max-width: 720px) { .tier-grid { grid-template-columns: repeat(2, 1fr); } }
.tier-card {
  border: 1px solid var(--line-strong); border-radius: var(--radius); padding: 14px 12px;
  background: var(--card); position: relative; text-align: center;
}
.tier-card.rec { border-color: var(--amber); box-shadow: 0 0 0 2px var(--amber-soft) inset; }
.tier-card .cap { font-family: var(--mono); font-weight: 700; font-size: 1.25rem; }
.tier-card .cap small { font-size: .62rem; color: var(--text-faint); font-weight: 400; }
.badge {
  display: inline-block; margin: 8px 0 6px; font-size: .74rem; font-weight: 600;
  padding: 2px 9px; border-radius: 20px;
}
.badge.b-부족 { background: var(--c-video); color: #fff; }
.badge.b-빠듯 { background: var(--amber); color: var(--ink); }
.badge.b-넉넉 { background: var(--c-photos); color: #fff; }
.badge.b-과잉 { background: var(--c-system); color: #fff; }
.tier-card .ratio { font-family: var(--mono); font-size: .74rem; color: var(--text-faint); }
.rec-flag {
  position: absolute; top: -9px; left: 50%; transform: translateX(-50%);
  font-size: .62rem; font-family: var(--mono); letter-spacing: .08em;
  background: var(--amber); color: var(--ink); padding: 2px 8px; border-radius: 10px; font-weight: 600;
}

.verdict {
  margin-top: 16px; padding: 14px 16px; border-radius: var(--radius);
  background: var(--amber-soft); border: 1px solid var(--amber);
  font-size: 1.02rem;
}
.verdict b { color: var(--amber-deep); }

/* coupang link */
.cp-link {
  display: inline-flex; align-items: center; gap: 8px; margin-top: 12px;
  font-weight: 600; font-size: .9rem; cursor: pointer;
  background: var(--ink); color: var(--paper); border: 1px solid var(--ink);
  border-radius: var(--radius); padding: 10px 16px;
}
.cp-link:hover { background: var(--amber); color: var(--ink); border-color: var(--amber-deep); text-decoration: none; }
.cp-note { font-size: .74rem; color: var(--text-faint); margin-top: 6px; }

/* collapsible notes */
details.note {
  margin-top: 18px; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--paper-2); padding: 4px 14px;
}
details.note summary { cursor: pointer; font-weight: 600; font-size: .9rem; padding: 10px 0; }
details.note[open] summary { border-bottom: 1px solid var(--line); margin-bottom: 10px; }
details.note p, details.note li { font-size: .86rem; color: var(--text-mute); }
details.note a { word-break: break-all; }

.updated-flag {
  display: inline-flex; align-items: center; gap: 7px; margin-top: 14px;
  font-family: var(--mono); font-size: .72rem; color: var(--text-faint);
}
.updated-flag i { width: 7px; height: 7px; border-radius: 50%; background: var(--c-photos); }

/* ---------- prose / guide ---------- */
.prose { max-width: 68ch; }
.prose h2 {
  font-size: 1.35rem; margin: 34px 0 12px; padding-top: 8px;
  border-top: 1px solid var(--line);
}
.prose h3 { font-size: 1.08rem; margin: 22px 0 8px; }
.prose p { margin: 0 0 14px; }
.prose ul, .prose ol { margin: 0 0 16px; padding-left: 22px; }
.prose li { margin-bottom: 7px; }
.prose .src { font-size: .8rem; color: var(--text-faint); }
.lead { font-size: 1.08rem; color: var(--text-mute); }

/* answer box */
.answer-box {
  background: var(--ink); color: var(--paper); border-radius: var(--radius-lg);
  padding: 22px 20px; text-align: center; margin: 8px 0 4px;
  border: 1px solid var(--ink);
}
.answer-box .ab-label { font-family: var(--mono); font-size: .74rem; letter-spacing: .08em; color: var(--amber); text-transform: uppercase; }
.answer-box .ab-num { font-family: var(--mono); font-weight: 700; font-size: clamp(2.4rem, 9vw, 3.6rem); line-height: 1.1; color: var(--paper); margin: 6px 0 4px; font-variant-numeric: tabular-nums; }
.answer-box .ab-num em { color: var(--amber); font-style: normal; }
.answer-box .ab-cap { font-size: .9rem; color: rgba(244,241,234,.72); }

/* matrix reference cards */
.matrix-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; }
.mx-card {
  border: 1px solid var(--line-strong); border-radius: var(--radius); padding: 14px 13px;
  background: var(--card);
}
.mx-card .mx-cap { font-family: var(--mono); font-weight: 600; font-size: .82rem; color: var(--text-mute); }
.mx-card .mx-cap b { color: var(--amber-deep); }
.mx-card .mx-num { font-family: var(--mono); font-weight: 700; font-size: 1.6rem; margin: 4px 0 0; font-variant-numeric: tabular-nums; }
.mx-card .mx-unit { font-size: .78rem; color: var(--text-faint); }

/* mini calc */
.mini-calc { margin-top: 16px; }
.mini-out {
  margin-top: 14px; padding: 16px; text-align: center;
  background: var(--paper-2); border: 1px solid var(--line); border-left: 4px solid var(--amber);
  border-radius: var(--radius);
}
.mini-out .mo-num { font-family: var(--mono); font-weight: 700; font-size: clamp(2rem,7vw,2.8rem); color: var(--text); font-variant-numeric: tabular-nums; }
.mini-out .mo-num em { color: var(--amber-deep); font-style: normal; }
.mini-out .mo-cap { font-size: .86rem; color: var(--text-mute); }

/* decision widget (iphone page) */
.decide-grid { display: grid; gap: 16px; }
.q-block { border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; background: var(--card); }
.q-block .q-title { font-weight: 600; margin-bottom: 10px; font-size: .95rem; }

/* type cards */
.type-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px,1fr)); gap: 14px; }
.type-card { border: 1px solid var(--line-strong); border-radius: var(--radius); padding: 16px; background: var(--card); }
.type-card h3 { margin: 0 0 4px; font-size: 1.05rem; }
.type-card .rec-cap { font-family: var(--mono); font-weight: 700; color: var(--amber-deep); font-size: 1.1rem; }
.type-card p { font-size: .88rem; color: var(--text-mute); margin: 8px 0 0; }

/* FAQ accordion */
.faq-list { margin-top: 8px; }
.faq-item { border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 10px; background: var(--card); overflow: hidden; }
.faq-item summary {
  cursor: pointer; padding: 15px 16px; font-weight: 600; font-size: .98rem;
  list-style: none; display: flex; justify-content: space-between; gap: 12px; align-items: center;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; font-family: var(--mono); color: var(--amber-deep); font-size: 1.3rem; }
.faq-item[open] summary::after { content: '–'; }
.faq-item summary::before {
  content: 'Q'; font-family: var(--mono); font-weight: 700; color: var(--amber-deep);
  margin-right: 4px;
}
.faq-item .faq-a { padding: 0 16px 16px; color: var(--text-mute); border-top: 1px solid var(--line); padding-top: 14px; }
.faq-item .faq-a p { margin: 0 0 10px; }
.faq-item .faq-a p:last-child { margin-bottom: 0; }

/* checklist card */
.checklist {
  border: 1px solid var(--amber); background: var(--amber-soft); border-radius: var(--radius-lg);
  padding: 18px 20px; margin-top: 8px;
}
.checklist h3 { margin: 0 0 12px; }
.checklist ul { list-style: none; padding: 0; margin: 0; }
.checklist li { padding-left: 28px; position: relative; margin-bottom: 9px; }
.checklist li::before {
  content: '▪'; position: absolute; left: 6px; top: 0; color: var(--amber-deep); font-size: 1.1rem;
}

/* internal link cards */
.link-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px,1fr)); gap: 14px; margin-top: 10px; }
.link-card {
  display: block; border: 1px solid var(--line-strong); border-radius: var(--radius);
  padding: 16px; background: var(--card); color: var(--text);
}
.link-card:hover { border-color: var(--amber); text-decoration: none; box-shadow: var(--shadow); }
.link-card .lc-kicker { font-family: var(--mono); font-size: .68rem; letter-spacing: .08em; color: var(--amber-deep); text-transform: uppercase; }
.link-card h3 { margin: 6px 0 4px; font-size: 1.02rem; }
.link-card p { margin: 0; font-size: .84rem; color: var(--text-mute); }

.section-title { font-size: 1.4rem; margin: 0 0 6px; }
.section-intro { color: var(--text-mute); margin: 0 0 16px; max-width: 64ch; }

.disclaimer {
  margin-top: 22px; font-size: .82rem; color: var(--text-faint);
  border-top: 1px solid var(--line); padding-top: 14px;
}

/* ---------- footer ---------- */
footer { background: var(--ink); color: var(--paper); margin-top: 48px; padding: 40px 0 28px; }
footer .container { max-width: 1080px; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px,1fr)); gap: 26px; }
.footer-col h4 { font-family: var(--mono); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; color: var(--amber); margin: 0 0 12px; }
.footer-col a { display: block; color: rgba(244,241,234,.78); font-size: .86rem; margin-bottom: 8px; }
.footer-col a:hover { color: var(--paper); }
.footer-bottom { margin-top: 30px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.12); }
.footer-bottom p { margin: 0 0 6px; font-size: .8rem; color: rgba(244,241,234,.6); }
.footer-plate { font-family: var(--mono); font-size: .68rem; letter-spacing: .06em; color: rgba(244,241,234,.42) !important; }
.footer-plate a { color: var(--amber); }

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

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