/* ============================================================================
   tools-calc.css — 러너온 계산기 공통 디자인 시스템
   페이스 / 칼로리 / 기록예측 / 심박존 / VO2 / 체중 / 빌드업 / 인터벌 공유
   라이트·다크 모드 자동 대응 (CSS 변수)
   ========================================================================= */
:root {
    --tc-bg: var(--ro-surface, #fff);
    --tc-bg-soft: var(--ro-surface-2, #f8fafc);
    --tc-border: var(--ro-border, rgba(15,23,42,0.08));
    --tc-text: var(--ro-text, #0f172a);
    --tc-text-sub: var(--ro-text-sub, #64748b);
    --tc-accent: #4e8fff;
    --tc-accent-soft: rgba(78,143,255,0.08);
    --tc-success: #22c55e;
    --tc-warn: #f97316;
    --tc-danger: #ef4444;
    --tc-purple: #a855f7;
}
html[data-theme="light"] { color-scheme: light; }
html[data-theme="dark"] {
    --tc-bg: #161b22;
    --tc-bg-soft: #0d1117;
    --tc-border: rgba(255,255,255,0.08);
    --tc-text: #e8ecf2;
    --tc-text-sub: #b6bdc7;
    --tc-accent: #6ba4ff;
    --tc-accent-soft: rgba(107,164,255,0.12);
    /* 브라우저에게 "form 컨트롤도 다크" 라고 명시 — 안 하면 input 이 흰색으로 렌더됨 */
    color-scheme: dark;
}
html[data-theme="dark"] .tc-input,
html[data-theme="dark"] .tc-select,
html[data-theme="dark"] .tc-time input,
html[data-theme="dark"] input[type="number"],
html[data-theme="dark"] input[type="text"],
html[data-theme="dark"] input[type="email"],
html[data-theme="dark"] input[type="tel"],
html[data-theme="dark"] select,
html[data-theme="dark"] textarea {
    color-scheme: dark;
    background-color: var(--tc-bg-soft) !important;
    color: var(--tc-text) !important;
    border-color: var(--tc-border) !important;
}
html[data-theme="dark"] .tc-input::placeholder,
html[data-theme="dark"] .tc-time input::placeholder,
html[data-theme="dark"] textarea::placeholder {
    color: var(--tc-text-sub);
    opacity: 0.6;
}
/* number 입력의 spinner 도 다크 톤 */
html[data-theme="dark"] input[type="number"]::-webkit-inner-spin-button,
html[data-theme="dark"] input[type="number"]::-webkit-outer-spin-button {
    filter: invert(0.85);
}

.tc-wrap { max-width: 920px; margin: 0 auto; padding: 0 12px; }

/* ── 페이지 헤더 ── */
.tc-breadcrumb { font-size: 12px; color: var(--tc-text-sub); margin: 12px 4px; }
.tc-breadcrumb a { color: inherit; text-decoration: none; }
.tc-breadcrumb a:hover { color: var(--tc-accent); }

.tc-hero { text-align: center; padding: 24px 12px 18px; }
.tc-hero h1 {
    font-size: clamp(24px, 4vw, 32px); font-weight: 900; letter-spacing: -0.02em;
    color: var(--tc-text); margin: 0 0 10px;
}
.tc-hero__sub {
    color: var(--tc-text-sub); margin: 0 auto; font-size: 14px; line-height: 1.65;
    max-width: 640px;
}
.tc-hero__sub strong { color: var(--tc-text); }

/* ── 카드 (입력/결과 공통) ── */
.tc-card {
    background: var(--tc-bg); border: 1px solid var(--tc-border);
    border-radius: 16px; padding: 22px;
}
.tc-card + .tc-card { margin-top: 14px; }

/* ── 입력 ── */
.tc-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
.tc-field { display: flex; flex-direction: column; gap: 6px; }
.tc-label {
    font-size: 13px; font-weight: 700; color: var(--tc-text-sub);
    display: flex; align-items: center; gap: 4px;
}
.tc-label__opt { color: var(--tc-text-sub); font-weight: 400; font-size: 11px; }
.tc-input, .tc-select, .tc-time input {
    padding: 11px 14px; border-radius: 10px; border: 1px solid var(--tc-border);
    background-color: var(--tc-bg-soft);
    color: var(--tc-text);
    font-size: 15px; font-weight: 600;
    font-variant-numeric: tabular-nums;
    outline: none; transition: border-color 0.15s, box-shadow 0.15s;
    width: 100%; appearance: none;
    -webkit-appearance: none; -moz-appearance: textfield;
    color-scheme: light dark;
}
.tc-input::placeholder, .tc-time input::placeholder {
    color: var(--tc-text-sub); opacity: 0.55; font-weight: 400;
}
.tc-select { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%2364748b' d='M6 8L0 0h12z'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 14px center; padding-right: 36px; }
.tc-input:focus, .tc-select:focus {
    border-color: var(--tc-accent); box-shadow: 0 0 0 3px var(--tc-accent-soft);
}
.tc-time { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 6px; }
.tc-time--mm-ss { grid-template-columns: 1fr 1fr; }
.tc-time input { text-align: center; }
.tc-hint { font-size: 11px; color: var(--tc-text-sub); margin-top: 2px; }

/* ── 라디오 토글 ── */
.tc-radios { display: flex; gap: 6px; flex-wrap: wrap; }
.tc-radio { position: relative; }
.tc-radio input { position: absolute; opacity: 0; pointer-events: none; }
.tc-radio span {
    display: inline-flex; padding: 8px 14px; border-radius: 999px;
    border: 1px solid var(--tc-border); background: var(--tc-bg-soft);
    color: var(--tc-text-sub); font-size: 13px; font-weight: 600;
    cursor: pointer; transition: all 0.15s;
}
.tc-radio input:checked + span {
    background: var(--tc-accent); color: #fff; border-color: transparent;
}

/* ── 결과 — 큰 숫자 ── */
.tc-result {
    margin-top: 18px; padding-top: 18px; border-top: 1px dashed var(--tc-border);
    display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px;
}
.tc-result__cell { text-align: center; }
.tc-result__label {
    font-size: 11px; font-weight: 700; color: var(--tc-text-sub);
    text-transform: uppercase; letter-spacing: 0.08em;
}
.tc-result__value {
    font-size: clamp(28px, 6vw, 40px); font-weight: 900;
    color: var(--tc-accent); font-variant-numeric: tabular-nums;
    line-height: 1.1; margin-top: 4px;
}
.tc-result__unit { font-size: 13px; color: var(--tc-text-sub); margin-top: 2px; }

/* ── 메트릭 (작은 카드 그리드) ── */
.tc-metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 10px; margin-top: 16px; }
.tc-metric { padding: 12px 14px; background: var(--tc-bg-soft); border-radius: 10px; }
.tc-metric__k {
    font-size: 11px; font-weight: 700; color: var(--tc-text-sub);
    text-transform: uppercase; letter-spacing: 0.04em;
}
.tc-metric__v {
    font-size: 18px; font-weight: 800; color: var(--tc-text);
    font-variant-numeric: tabular-nums; margin-top: 2px;
}

/* ── 위트 코멘트 ── */
.tc-vibe {
    margin-top: 16px; padding: 14px 16px; border-radius: 12px;
    background: linear-gradient(135deg, rgba(78,143,255,0.08), rgba(168,85,247,0.06));
    border: 1px solid rgba(78,143,255,0.15);
    display: flex; align-items: flex-start; gap: 12px;
}
html[data-theme="dark"] .tc-vibe {
    background: linear-gradient(135deg, rgba(107,164,255,0.12), rgba(168,85,247,0.08));
    border-color: rgba(107,164,255,0.2);
}
.tc-vibe__icon {
    flex-shrink: 0; width: 36px; height: 36px; border-radius: 10px;
    background: var(--tc-bg); display: flex; align-items: center; justify-content: center;
    font-size: 18px;
}
.tc-vibe__body { flex: 1; }
.tc-vibe__title { font-size: 14px; font-weight: 800; color: var(--tc-text); }
.tc-vibe__sub { font-size: 13px; color: var(--tc-text-sub); line-height: 1.55; margin-top: 3px; }

/* ── 섹션 타이틀 ── */
.tc-section-title {
    font-size: 17px; font-weight: 800; color: var(--tc-text);
    margin: 28px 0 12px; display: flex; align-items: center; gap: 8px;
}
.tc-section-title__sub { font-size: 12px; font-weight: 500; color: var(--tc-text-sub); }

/* ── 테이블 ── */
.tc-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.tc-table th, .tc-table td {
    padding: 10px 12px; text-align: right; font-variant-numeric: tabular-nums;
    border-bottom: 1px solid var(--tc-border);
}
.tc-table th {
    text-align: left; color: var(--tc-text-sub); font-weight: 700;
    font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em;
}
.tc-table td:first-child { text-align: left; font-weight: 700; color: var(--tc-text); }
.tc-table tr:hover td { background: var(--tc-bg-soft); }

/* ── 진행 바 (5존 그래디언트) ── */
.tc-zone-bar {
    height: 10px; background: linear-gradient(90deg, #22c55e 0%, #84cc16 25%, #facc15 50%, #f97316 75%, #ef4444 100%);
    border-radius: 999px; position: relative; margin-top: 10px;
}
.tc-zone-marker {
    position: absolute; top: -4px; width: 18px; height: 18px;
    background: var(--tc-bg); border: 3px solid var(--tc-text);
    border-radius: 50%; transform: translateX(-50%); transition: left 0.3s;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}
.tc-zone-labels {
    display: flex; justify-content: space-between;
    font-size: 10px; color: var(--tc-text-sub); margin-top: 6px;
}

/* ── 공유 / 액션 버튼 ── */
.tc-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
.tc-btn {
    padding: 10px 18px; border-radius: 10px; font-weight: 700; font-size: 13px;
    text-decoration: none; cursor: pointer; transition: all 0.15s;
    display: inline-flex; align-items: center; gap: 6px;
    border: 1px solid var(--tc-border); background: var(--tc-bg); color: var(--tc-text);
}
.tc-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(0,0,0,0.06); }
.tc-btn--primary { background: var(--tc-accent); color: #fff; border-color: transparent; }
.tc-btn--ghost { background: transparent; }
.tc-btn--kakao { background: #FEE500; color: #191600; border-color: #FEE500; }

/* ── 공식 설명 박스 (어떻게 계산되나요?) ── */
.tc-formula {
    margin-top: 24px; background: var(--tc-bg-soft);
    border: 1px solid var(--tc-border); border-radius: 14px;
    overflow: hidden;
}
.tc-formula__head {
    padding: 14px 18px; cursor: pointer; user-select: none;
    display: flex; justify-content: space-between; align-items: center;
    font-weight: 700; font-size: 14px; color: var(--tc-text);
    background: var(--tc-bg);
}
.tc-formula__head:hover { background: var(--tc-bg-soft); }
.tc-formula__head::after {
    content: '+'; color: var(--tc-text-sub); font-size: 18px; font-weight: 700;
    transition: transform 0.2s;
}
.tc-formula[open] .tc-formula__head::after { content: '−'; }
.tc-formula__body {
    padding: 0 18px 18px; font-size: 13px; color: var(--tc-text-sub); line-height: 1.7;
}
.tc-formula__body code {
    background: var(--tc-bg); padding: 2px 8px; border-radius: 6px;
    font-size: 12.5px; color: var(--tc-text); font-family: 'Consolas', 'Monaco', monospace;
}
.tc-formula__body strong { color: var(--tc-text); }
.tc-formula__body ul { margin: 8px 0; padding-left: 20px; }
.tc-formula__body li { margin-bottom: 4px; }
.tc-formula__cite {
    font-size: 11px; color: var(--tc-text-sub); margin-top: 12px;
    padding-top: 10px; border-top: 1px solid var(--tc-border);
}
.tc-formula__cite a { color: var(--tc-accent); text-decoration: none; }

/* ── CTA ── */
.tc-cta {
    margin-top: 28px; padding: 22px;
    background: linear-gradient(135deg, rgba(78,143,255,0.06), rgba(168,85,247,0.06));
    border: 1px solid var(--tc-border); border-radius: 16px;
}
.tc-cta h3 { margin: 0 0 8px; font-size: 17px; font-weight: 800; color: var(--tc-text); }
.tc-cta p { margin: 0 0 14px; color: var(--tc-text-sub); font-size: 13px; line-height: 1.6; }

/* ── 토스트 ── */
.tc-toast {
    position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
    background: var(--tc-text); color: var(--tc-bg);
    padding: 10px 18px; border-radius: 999px; font-size: 13px; font-weight: 700;
    opacity: 0; transition: opacity 0.2s; pointer-events: none; z-index: 9999;
}
.tc-toast.show { opacity: 1; }

/* ── 허브 페이지 카드 그리드 ── */
.tc-hub-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 14px; margin-top: 18px;
}
.tc-hub-card {
    background: var(--tc-bg); border: 1px solid var(--tc-border);
    border-radius: 14px; padding: 22px 20px; text-decoration: none;
    transition: all 0.18s; display: flex; flex-direction: column; gap: 8px;
}
.tc-hub-card:hover { transform: translateY(-3px); box-shadow: 0 10px 28px rgba(15,23,42,0.08); border-color: var(--tc-accent); }
.tc-hub-card__icon {
    width: 44px; height: 44px; border-radius: 12px;
    background: var(--tc-accent-soft); color: var(--tc-accent);
    display: flex; align-items: center; justify-content: center; font-size: 22px;
}
.tc-hub-card__title { font-size: 16px; font-weight: 800; color: var(--tc-text); margin-top: 4px; }
.tc-hub-card__desc { font-size: 13px; color: var(--tc-text-sub); line-height: 1.55; }
.tc-hub-card__badge {
    align-self: flex-start; font-size: 10px; font-weight: 700;
    padding: 3px 8px; border-radius: 999px;
    background: var(--tc-accent-soft); color: var(--tc-accent); text-transform: uppercase; letter-spacing: 0.05em;
}