/* Unsolved — 밤의 장부 / 낮의 수확.
   다크 캔버스(night ledger) 위에 크림 페이퍼 객체(harvest)가 떠오르는 디자인 시안 재현.
   팔레트·타이포: 명세 9 + 디자인 시안(Field Builder Patronage). */

:root {
    /* 다크 캔버스 */
    --bg: #1E1813;
    --bg-soft: #241D16;
    --bg-raise: #2A2219;
    /* 페이퍼 (Solving 카드·모달) */
    --paper: #F3ECDF;
    --card: #FBF6EA;
    --card-deep: #EEE4D2;
    /* 잉크 */
    --soil: #2C241B;
    --soil-soft: #5A4E40;
    --cream: #F3ECDF;
    --cream-muted: #A99B85;
    --faint: #8C7E6A;
    /* 강조 */
    --clay: #C2562E;
    --clay-bright: #D2683B;
    --clay-deep: #9C421F;
    --gold: #B8893B;
    --gold-bright: #C9A24B;
    --leaf: #4F6F46;
    --leaf-bright: #7FA06B;
    /* 선 */
    --line: #D3C6AC;
    --line-dark: rgba(211, 198, 172, 0.14);

    --maxw: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--cream);
    font-family: 'Spline Sans', system-ui, sans-serif;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: 'Fraunces', Georgia, serif; margin: 0; font-weight: 600; }

.mono {
    font-family: 'Spline Sans Mono', ui-monospace, monospace;
    font-variant-numeric: tabular-nums;
}

a { color: inherit; }

:focus-visible { outline: 2.5px solid var(--clay-bright); outline-offset: 3px; border-radius: 4px; }

/* 이중언어 라벨: 한글 + / ENGLISH(모노 대문자 faint) */
.kv { display: inline-flex; align-items: baseline; gap: 8px; }
.kv .en {
    font-family: 'Spline Sans Mono', monospace;
    font-size: 0.68rem; letter-spacing: 0.14em; text-transform: uppercase;
    color: var(--faint);
}

/* ───────── 상단 바 ───────── */
.topbar {
    position: sticky; top: 0; z-index: 40;
    background: rgba(20, 16, 12, 0.88);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--line-dark);
}
.topbar-inner {
    max-width: var(--maxw); margin: 0 auto; padding: 12px 24px;
    display: flex; align-items: center; gap: 16px;
}
.brand { font-family: 'Fraunces', serif; font-weight: 600; font-size: 1.25rem; letter-spacing: 0.2px; }
.brand .arrow { color: var(--clay-bright); font-style: italic; }
.topbar-tagline { color: var(--cream-muted); font-size: 0.82rem; }
.topbar-donation { margin-left: auto; display: flex; align-items: baseline; gap: 9px; }
.topbar-donation-label {
    font-family: 'Spline Sans Mono', monospace;
    font-size: 0.64rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--faint);
}
.topbar-donation-amount {
    font-family: 'Fraunces', serif; font-weight: 600; color: var(--gold-bright); font-size: 1.15rem;
}

/* ───────── 히어로 ───────── */
.hero { padding: 64px 24px 40px; max-width: var(--maxw); margin: 0 auto; }
.hero-kicker {
    font-family: 'Spline Sans Mono', monospace; font-size: 0.7rem;
    letter-spacing: 0.18em; text-transform: uppercase; color: var(--clay-bright);
    display: flex; align-items: center; gap: 10px; margin-bottom: 22px;
}
.hero-kicker::before { content: ''; width: 28px; height: 1px; background: var(--clay); }
.hero-title { font-size: clamp(2.2rem, 5.5vw, 3.6rem); line-height: 1.06; letter-spacing: -0.015em; }
.hero-sub { max-width: 620px; margin: 20px 0 0; color: var(--cream-muted); font-size: 1.05rem; }

.metrics { display: flex; flex-wrap: wrap; gap: 0; margin-top: 40px; border-top: 1px solid var(--line-dark); }
.metric { padding: 20px 36px 6px 0; margin-right: 36px; }
.metric-num { font-family: 'Fraunces', serif; font-size: 2.4rem; font-weight: 600; color: var(--cream); line-height: 1; display: block; font-variant-numeric: tabular-nums; }
.metric-label {
    display: block; margin-top: 8px;
    font-family: 'Spline Sans Mono', monospace; font-size: 0.68rem;
    letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint);
}

/* ───────── 탭 ───────── */
.tabs {
    position: sticky; top: 49px; z-index: 30;
    max-width: var(--maxw); margin: 16px auto 0; padding: 0 24px;
    display: flex; gap: 28px;
    border-bottom: 1px solid var(--line-dark);
    background: var(--bg);
}
.tab {
    appearance: none; background: none; border: none;
    border-bottom: 2px solid transparent; margin-bottom: -1px;
    padding: 14px 2px 12px; cursor: pointer; text-align: left;
    color: var(--faint); transition: color 0.18s, border-color 0.18s;
}
.tab-name { display: block; font-family: 'Fraunces', serif; font-size: 1.4rem; font-weight: 600; }
.tab-desc {
    display: block; font-family: 'Spline Sans Mono', monospace;
    font-size: 0.64rem; letter-spacing: 0.1em; text-transform: uppercase; margin-top: 3px;
}
.tab.is-active { color: var(--cream); border-bottom-color: var(--clay); }
.tab.is-active.solving { border-bottom-color: var(--leaf-bright); }
.tab:hover:not(.is-active) { color: var(--cream-muted); }

/* ───────── 패널 / 섹션 헤더 ───────── */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 32px 24px 0; }
.panel { display: none; }
.panel.is-active { display: block; animation: fade 0.28s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

.section-head { margin-bottom: 26px; }
.section-eyebrow {
    font-family: 'Spline Sans Mono', monospace; font-size: 0.7rem;
    letter-spacing: 0.16em; text-transform: uppercase; color: var(--gold-bright);
    margin-bottom: 10px;
}
.panel.solving .section-eyebrow { color: var(--leaf-bright); }
.section-title { font-size: clamp(1.7rem, 3.5vw, 2.3rem); line-height: 1.1; }
.section-title .en { font-family: 'Spline Sans Mono', monospace; font-size: 0.8rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--faint); font-weight: 400; margin-left: 10px; }
.section-sub { color: var(--cream-muted); margin: 12px 0 0; max-width: 640px; }
.section-foot {
    display: flex; align-items: center; justify-content: space-between; gap: 16px;
    margin: 4px 0 22px; flex-wrap: wrap;
}
.sort-note {
    font-family: 'Spline Sans Mono', monospace; font-size: 0.68rem;
    letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint);
}

/* ───────── Unsolved 행-리스트 (밤의 장부) ───────── */
.ledger { border-top: 1px solid var(--line-dark); }
.prow {
    display: grid; grid-template-columns: 1fr auto;
    gap: 24px; padding: 26px 4px;
    border-bottom: 1px solid var(--line-dark);
    transition: background 0.18s;
}
.prow:hover { background: var(--bg-soft); }
.prow.flash { animation: flash 1s ease; }
@keyframes flash {
    0% { background: rgba(79, 111, 70, 0.28); }
    100% { background: transparent; }
}
.prow.highlight { background: rgba(184, 137, 59, 0.16); box-shadow: inset 3px 0 0 var(--gold); }

.prow-meta { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.prow-code {
    font-family: 'Spline Sans Mono', monospace; font-size: 0.72rem;
    letter-spacing: 0.08em; color: var(--faint);
}
.prow-title { font-size: 1.5rem; line-height: 1.18; color: var(--cream); }
.prow-grow { color: var(--gold-bright); font-style: italic; font-family: 'Fraunces', serif; }
.prow-desc { color: var(--cream-muted); font-size: 0.95rem; margin: 10px 0 0; max-width: 60ch; }
.prow-foot { margin-top: 16px; display: flex; align-items: center; gap: 12px; }

.prow-side {
    display: flex; flex-direction: column; align-items: flex-end; gap: 14px;
    min-width: 132px;
}
.prow-num { text-align: right; }
.prow-num b { font-family: 'Fraunces', serif; font-size: 2.1rem; font-weight: 600; color: var(--gold-bright); display: block; line-height: 1; font-variant-numeric: tabular-nums; }
.prow-num span {
    font-family: 'Spline Sans Mono', monospace; font-size: 0.6rem;
    letter-spacing: 0.12em; text-transform: uppercase; color: var(--faint);
}
.prow-actions { display: flex; gap: 8px; }

/* 상태 칩 (open=gold, active=leaf, solved=cream) */
.chip {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 4px 11px; border-radius: 999px;
    font-family: 'Spline Sans Mono', monospace;
    font-size: 0.64rem; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase;
    width: fit-content;
}
.chip::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.chip-open { background: rgba(201, 162, 75, 0.16); color: var(--gold-bright); }
.chip-active { background: rgba(127, 160, 107, 0.16); color: var(--leaf-bright); }
.chip-solved { background: rgba(243, 236, 223, 0.12); color: var(--cream); }

/* 아바타 스택 */
.avatars { display: flex; }
.avatar {
    width: 30px; height: 30px; border-radius: 50%;
    border: 2px solid var(--bg); margin-left: -9px;
    display: flex; align-items: center; justify-content: center;
    color: #fff; font-size: 0.7rem; font-weight: 600;
    font-family: 'Spline Sans Mono', monospace;
}
.avatar:first-child { margin-left: 0; }
.challenger-count { font-size: 0.82rem; color: var(--cream-muted); }
.challenger-empty { font-size: 0.85rem; color: var(--faint); font-style: italic; }
/* 페이퍼 카드 안 아바타 테두리는 카드색 */
.card .avatar { border-color: var(--card); }

/* ───────── Solving 카드 (낮의 수확, 크림 페이퍼) ───────── */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(330px, 1fr)); gap: 20px; }
.card {
    background: var(--card); color: var(--soil);
    border: 1px solid var(--card-deep); border-radius: 16px;
    padding: 24px; display: flex; flex-direction: column; gap: 13px;
    box-shadow: 0 18px 40px -28px rgba(0, 0, 0, 0.7);
    transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 26px 50px -28px rgba(0, 0, 0, 0.8); }
.card.highlight { outline: 3px solid var(--gold); outline-offset: 3px; }

.builder { display: flex; align-items: center; gap: 12px; }
.builder-meta { display: flex; flex-direction: column; }
.builder-name { font-weight: 600; font-size: 0.98rem; display: flex; align-items: center; gap: 7px; color: var(--soil); }
.builder-place {
    font-family: 'Spline Sans Mono', monospace; font-size: 0.72rem;
    color: var(--soil-soft); letter-spacing: 0.02em; margin-top: 2px;
}
.verified-badge {
    font-family: 'Spline Sans Mono', monospace;
    font-size: 0.6rem; letter-spacing: 0.06em; text-transform: uppercase; font-weight: 600;
    color: var(--leaf); background: rgba(79, 111, 70, 0.15);
    padding: 2px 7px; border-radius: 999px;
}
.builder-story { font-size: 0.84rem; color: var(--soil-soft); margin: 0; }
.card-title { font-size: 1.35rem; line-height: 1.18; color: var(--soil); }
.card-desc { color: var(--soil-soft); font-size: 0.92rem; margin: 0; }

.solved-problem {
    background: rgba(79, 111, 70, 0.08); border-left: 3px solid var(--leaf);
    padding: 9px 13px; border-radius: 7px; font-size: 0.88rem; color: var(--soil);
}
.solved-problem .lbl {
    font-family: 'Spline Sans Mono', monospace; font-size: 0.62rem;
    letter-spacing: 0.08em; text-transform: uppercase; color: var(--faint);
    display: block; margin-bottom: 3px;
}

.impact { display: flex; gap: 22px; flex-wrap: wrap; padding-top: 2px; }
.impact .stat-num { font-family: 'Fraunces', serif; font-size: 1.15rem; font-weight: 600; color: var(--leaf); display: block; line-height: 1.1; }
.impact .stat-lbl {
    font-family: 'Spline Sans Mono', monospace; font-size: 0.6rem;
    letter-spacing: 0.06em; text-transform: uppercase; color: var(--faint);
}

.card-actions { display: flex; align-items: center; gap: 10px; margin-top: auto; padding-top: 6px; flex-wrap: wrap; }
.service-link {
    font-family: 'Spline Sans Mono', monospace; font-size: 0.74rem;
    color: var(--clay); text-decoration: none; letter-spacing: 0.02em; margin-left: auto;
}
.service-link:hover { text-decoration: underline; }
.cross-link {
    background: none; border: none; cursor: pointer; padding: 4px 0 0; margin: 0;
    color: var(--clay); font-size: 0.8rem; text-decoration: underline; font-family: inherit; display: block;
}
/* 다크 행에서의 교차링크 */
.prow .cross-link { color: var(--clay-bright); padding: 0; }

/* ───────── 버튼 ───────── */
.btn {
    appearance: none; font-family: inherit; font-size: 0.85rem; font-weight: 600;
    border-radius: 999px; padding: 9px 18px; cursor: pointer; border: 1px solid transparent;
    transition: background 0.15s, color 0.15s, border-color 0.15s, transform 0.08s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--clay); color: #fff; }
.btn-primary:hover { background: var(--clay-deep); }
.btn-primary:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-ghost { background: transparent; border-color: var(--line-dark); color: var(--cream); }
.btn-ghost:hover { background: var(--bg-soft); }
.card .btn-ghost { border-color: var(--card-deep); color: var(--soil); }
.card .btn-ghost:hover { background: var(--card-deep); }

/* 토글 (관심/응원) */
.btn-toggle {
    display: inline-flex; align-items: center; gap: 7px;
    background: transparent; border: 1px solid var(--line-dark); color: var(--cream-muted);
    font-family: inherit; font-size: 0.8rem; font-weight: 600;
    padding: 8px 13px; border-radius: 999px; cursor: pointer; transition: all 0.15s;
}
.btn-toggle .heart { font-size: 0.95rem; line-height: 1; }
.btn-toggle.on { background: rgba(201, 162, 75, 0.18); border-color: var(--gold); color: var(--gold-bright); }
.btn-toggle:hover { border-color: var(--cream-muted); }
/* 페이퍼 카드 안 토글(응원) */
.card .btn-toggle { border-color: var(--card-deep); color: var(--soil-soft); }
.card .btn-toggle.cheer.on { background: rgba(79, 111, 70, 0.14); border-color: var(--leaf); color: var(--leaf); }
.card .btn-toggle:hover { border-color: var(--soil-soft); }

.btn-challenge { background: var(--clay); color: #fff; border: none; }
.btn-challenge:hover { background: var(--clay-deep); }
.btn-challenge:disabled { opacity: 0.5; cursor: default; background: var(--bg-raise); color: var(--cream-muted); }

/* ───────── 모달 (크림 페이퍼) ───────── */
.modal-overlay {
    position: fixed; inset: 0; background: rgba(12, 9, 6, 0.7);
    display: flex; align-items: center; justify-content: center; padding: 20px; z-index: 100;
    animation: fade 0.2s ease;
}
/* author display:flex 가 [hidden] UA 규칙을 이기므로 명시적으로 숨김 */
.modal-overlay[hidden] { display: none; }
.modal {
    background: var(--paper); color: var(--soil);
    border-radius: 20px; border: 1px solid var(--card-deep); padding: 30px;
    width: 100%; max-width: 460px; position: relative;
    box-shadow: 0 40px 90px -30px rgba(0, 0, 0, 0.8);
    max-height: 90vh; overflow-y: auto;
}
.modal-close { position: absolute; top: 18px; right: 18px; background: none; border: none; cursor: pointer; color: var(--faint); font-size: 1rem; }
.modal-eyebrow {
    font-family: 'Spline Sans Mono', monospace; font-size: 0.68rem;
    letter-spacing: 0.14em; text-transform: uppercase; color: var(--clay);
    display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 16px;
}
.modal-title { font-size: 1.65rem; line-height: 1.15; color: var(--soil); }
.modal-title .nm { color: var(--clay); }
.modal-sub { color: var(--soil-soft); font-size: 0.9rem; margin: 8px 0 20px; }

.sim-pill {
    font-family: 'Spline Sans Mono', monospace; font-size: 0.62rem; font-weight: 500;
    letter-spacing: 0.04em; text-transform: none;
    background: rgba(184, 137, 59, 0.18); color: var(--gold); padding: 4px 10px; border-radius: 999px;
}

.donate-builder { display: flex; align-items: center; gap: 12px; margin-bottom: 22px; }
.donate-builder .avatar { width: 44px; height: 44px; font-size: 0.9rem; border-color: var(--paper); }
.donate-builder-name { font-weight: 600; font-size: 1rem; color: var(--soil); }
.donate-builder-name b { font-weight: 600; }
.donate-builder-place { font-family: 'Spline Sans Mono', monospace; font-size: 0.74rem; color: var(--soil-soft); margin-top: 2px; }

.field-label {
    display: block; font-family: 'Spline Sans Mono', monospace; font-size: 0.68rem;
    font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; color: var(--soil-soft);
    margin: 0 0 9px;
}
.field { display: block; margin-bottom: 18px; }
.field input, .field textarea {
    width: 100%; font-family: inherit; font-size: 0.95rem; padding: 11px 13px;
    border: 1px solid var(--card-deep); border-radius: 10px; background: #fff; color: var(--soil); resize: vertical;
}
.field input:focus, .field textarea:focus { border-color: var(--clay); outline: none; }

.amount-presets { display: flex; gap: 10px; margin-bottom: 14px; }
.amount-chip {
    flex: 1; padding: 14px 8px; border-radius: 12px;
    border: 1.5px solid var(--card-deep); background: #fff;
    font-family: 'Fraunces', serif; font-weight: 600; font-size: 1rem;
    cursor: pointer; transition: all 0.15s; color: var(--soil); font-variant-numeric: tabular-nums;
}
.amount-chip.on { border-color: var(--clay); background: rgba(194, 86, 46, 0.08); color: var(--clay); }
.field.custom input { background: rgba(184, 137, 59, 0.07); }

.donate-transparency {
    background: rgba(184, 137, 59, 0.09); border-radius: 12px; padding: 15px 16px;
    font-size: 0.9rem; color: var(--soil); margin: 6px 0 0; line-height: 1.5;
}
.donate-transparency strong { color: var(--clay); font-weight: 600; }
.donate-transparency .ledger-note { display: block; margin-top: 8px; font-size: 0.8rem; color: var(--soil-soft); }

.sim-notice { font-size: 0.76rem; color: var(--faint); background: rgba(184, 137, 59, 0.08); padding: 10px 13px; border-radius: 9px; margin: 16px 0 0; }
.form-notice { font-size: 0.78rem; color: var(--soil-soft); background: rgba(184, 137, 59, 0.08); padding: 11px 13px; border-radius: 9px; margin: 2px 0 0; }
.form-notice b { color: var(--clay); font-weight: 600; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 22px; }

/* 성공 화면 */
.success-mark {
    width: 60px; height: 60px; border-radius: 50%; background: var(--leaf); color: #fff;
    display: flex; align-items: center; justify-content: center; font-size: 1.9rem; margin: 4px auto 18px;
}
#donate-success { text-align: center; }
#donate-success .modal-sub { margin-bottom: 18px; }
.ledger-box {
    background: var(--card); border: 1px dashed var(--line); border-radius: 12px; padding: 16px;
    display: flex; flex-direction: column; gap: 5px; align-items: center;
}
.ledger-label { font-family: 'Spline Sans Mono', monospace; font-size: 0.64rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); }
.ledger-no { font-family: 'Fraunces', serif; font-size: 1.3rem; font-weight: 600; color: var(--clay); }

/* ───────── 푸터 ───────── */
.site-foot { text-align: center; padding: 60px 24px; color: var(--cream-muted); border-top: 1px solid var(--line-dark); margin-top: 60px; }
.site-foot p { margin: 5px 0; }
.foot-faint { font-size: 0.8rem; color: var(--faint); }

/* ───────── 반응형 ───────── */
@media (max-width: 620px) {
    .topbar-tagline { display: none; }
    .hero { padding: 40px 20px 28px; }
    .tabs { padding: 0 18px; gap: 20px; }
    .wrap { padding: 24px 18px 0; }
    .metric { padding-right: 24px; margin-right: 24px; }
    .metric-num { font-size: 1.9rem; }
    .prow { grid-template-columns: 1fr; gap: 16px; }
    .prow-side { align-items: flex-start; flex-direction: row; justify-content: space-between; width: 100%; align-items: center; }
    .card-grid { grid-template-columns: 1fr; }
    .amount-chip { font-size: 0.88rem; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}