/* ================================================
   ai-common.css
   AI / 테크 계산기 공통 스타일
   개별 페이지 <style> 블록 대신 이 파일을 사용합니다.
   페이지 고유 스타일만 각 페이지 <style>에 남깁니다.
   ================================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #8B5CF6;
  --primary-light: rgba(139,92,246,0.12);
  --primary-border: rgba(139,92,246,0.3);
  --primary-rgb: 139,92,246;
  --gray-50: #F9FAFB; --gray-100: #F3F4F6; --gray-200: #E5E7EB;
  --gray-300: #D1D5DB; --gray-400: #9CA3AF; --gray-500: #6B7280;
  --gray-600: #4B5563; --gray-700: #374151; --gray-800: #1F2937; --gray-900: #111827;
  --success: #10B981; --danger: #EF4444; --warning: #F59E0B;
  --dark-bg: #F5F6F8; --dark-card: #FFFFFF; --dark-border: rgba(0,0,0,0.06);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 32px rgba(139,92,246,0.15), 0 4px 12px rgba(0,0,0,0.10);
}

html { font-size: 16px; overflow-y: scroll; scrollbar-gutter: stable; }
body { font-family: 'Pretendard', -apple-system, 'Apple SD Gothic Neo', sans-serif; background: #F5F6F8; color: var(--gray-900); line-height: 1.6; -webkit-font-smoothing: antialiased; -webkit-tap-highlight-color: transparent; }

/* ── Header ─────────────────────────────────── */
.site-header{position:sticky;top:0;z-index:100;background:rgba(15,17,23,0.95);backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,255,255,0.08)}
.header-inner{max-width:1400px;margin:0 auto;padding:0 24px;height:60px;display:flex;align-items:center;gap:32px}
.site-logo{display:flex;align-items:center;gap:10px;text-decoration:none;flex-shrink:0}
.logo-icon{width:32px;height:32px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:16px;overflow:hidden}
.logo-text{font-size:18px;font-weight:900;color:#fff;letter-spacing:-0.5px}
.logo-text span{color:#818CF8}
.header-nav{display:flex;align-items:center;gap:4px;flex:1}
.nav-item{display:flex;align-items:center;gap:6px;padding:6px 12px;border-radius:8px;text-decoration:none;font-size:13px;font-weight:600;color:#9CA3AF;transition:all .15s;white-space:nowrap}
.nav-item:hover{background:rgba(255,255,255,0.06);color:#fff}
.nav-item.active{background:rgba(139,92,246,0.12);color:var(--primary)}
.nav-dot{width:6px;height:6px;border-radius:50%;flex-shrink:0}
.header-cta{margin-left:auto;flex-shrink:0}
.btn-blog{padding:7px 16px;border-radius:8px;font-size:13px;font-weight:700;border:1px solid rgba(255,255,255,0.2);background:transparent;color:#D1D5DB;text-decoration:none;transition:all .15s}
.btn-blog:hover{border-color:var(--primary);color:var(--primary)}
.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:4px;margin-left:auto;background:none;border:none}
.hamburger span{display:block;width:22px;height:2px;background:#9CA3AF;border-radius:2px}
.mob-menu{display:none;background:rgba(15,17,23,0.98);border-bottom:1px solid rgba(255,255,255,0.08);padding:10px 16px 14px}
.mob-menu.open{display:grid;gap:8px}
.mob-link{display:flex;align-items:center;gap:6px;padding:10px 12px;border-radius:10px;text-decoration:none;font-size:14px;font-weight:600;color:#D1D5DB}
.mob-link.active{background:rgba(139,92,246,0.12);color:var(--primary)}
.mob-link:hover{background:rgba(255,255,255,0.06);color:#fff}

/* ── Page Layout ─────────────────────────────── */
.page-wrap { max-width: 800px; margin: 0 auto; padding: 24px 16px 60px; }

/* Page Header */
.page-header { background: linear-gradient(135deg, #F5F3FF 0%, #EDE9FE 50%, #DDD6FE 100%); border-radius: 20px; padding: 32px 32px 28px; margin-bottom: 24px; border: 1px solid rgba(139,92,246,0.2); position: relative; overflow: hidden; line-height: normal; }
.page-header::before { content: ''; position: absolute; top: -60px; right: -60px; width: 240px; height: 240px; border-radius: 50%; background: radial-gradient(circle, rgba(139,92,246,0.2) 0%, transparent 70%); }

/* Breadcrumb */
.breadcrumb { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--gray-500); margin-bottom: 14px; }
.breadcrumb a { color: var(--gray-500); text-decoration: none; }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb-sep { font-size: 10px; }

/* Page Header 내부 요소 */
.page-badge { display: inline-flex; align-items: center; gap: 6px; background: rgba(139,92,246,0.15); color: var(--primary); font-size: 11px; font-weight: 700; padding: 4px 12px; border-radius: 20px; margin-bottom: 10px; border: 1px solid rgba(139,92,246,0.3); }
.page-header-badge { display: inline-flex; align-items: center; gap: 6px; background: rgba(139,92,246,0.15); border: 1px solid rgba(139,92,246,0.3); border-radius: 20px; padding: 4px 12px; font-size: 11px; font-weight: 700; color: var(--primary); margin-bottom: 10px; }
.page-title { font-size: 26px; font-weight: 900; color: var(--gray-900); letter-spacing: -0.5px; line-height: 1.2; margin-bottom: 8px; }
.page-subtitle { font-size: 14px; color: var(--gray-600); }
.page-header h1 { font-size: 26px; font-weight: 900; color: var(--gray-900); letter-spacing: -0.5px; line-height: 1.2; margin-bottom: 8px; }
.page-header p { font-size: 13px; color: var(--gray-600); font-weight: 500; }

/* ── Cards ───────────────────────────────────── */
.card { background: #fff; border-radius: 16px; padding: 20px; margin-bottom: 16px; box-shadow: var(--shadow-sm); border: 1px solid var(--gray-100); }
.card-title { font-size: 13px; font-weight: 700; color: var(--gray-700); margin-bottom: 12px; }

/* ── Form Fields ─────────────────────────────── */
.field { margin-bottom: 16px; }
.field-label { font-size: 13px; font-weight: 600; color: var(--gray-700); margin-bottom: 6px; }
.label-hint { font-size: 11px; color: var(--gray-400); font-weight: 400; }
.input-wrap { display: flex; align-items: center; background: var(--gray-50); border: 1.5px solid var(--gray-200); border-radius: 10px; overflow: hidden; }
.input-wrap:focus-within { border-color: var(--primary); background: #fff; }
.input-wrap input { flex: 1; border: none; background: transparent; padding: 12px 14px; font-size: 15px; font-weight: 600; outline: none; font-family: inherit; }
.unit { padding: 0 14px; font-size: 13px; color: var(--gray-500); font-weight: 600; white-space: nowrap; }
.seg-group { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 14px; }
.seg-btn { flex: 1; min-width: 60px; padding: 8px 12px; border: 1.5px solid var(--gray-200); border-radius: 10px; background: #fff; font-size: 13px; font-weight: 600; color: var(--gray-600); cursor: pointer; transition: all .15s; font-family: inherit; }
.seg-btn:hover { border-color: var(--primary); color: var(--primary); }
.seg-btn.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.converted { font-size: 12px; color: var(--primary); margin-top: 4px; font-weight: 600; }
.field-hint { font-size: 11px; color: var(--gray-400); margin-top: 4px; }

/* Select dropdown */
select{padding:12px 16px;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 5l3 3 3-3' stroke='%239CA3AF' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center}

/* Info Box */
.info-box { background: rgba(139,92,246,0.08); border: 1px solid rgba(139,92,246,0.2); border-radius: 10px; padding: 12px 14px; margin-bottom: 14px; display: flex; gap: 8px; align-items: flex-start; }
.info-icon { font-size: 14px; flex-shrink: 0; margin-top: 1px; }
.info-box p { font-size: 12px; color: rgba(139,92,246,0.9); font-weight: 500; line-height: 1.6; }

/* ── Results ─────────────────────────────────── */
.result-card { background: #fff; border-radius: 16px; padding: 20px; margin-bottom: 16px; box-shadow: var(--shadow-md); border: 2px solid rgba(139,92,246,0.3); display: none; }
.result-card.show { display: block; }
.result-row { display: flex; justify-content: space-between; align-items: center; padding: 10px 0; border-bottom: 1px solid var(--gray-100); font-size: 14px; }
.result-row:last-child { border-bottom: none; }
.result-label { color: var(--gray-600); font-weight: 500; }
.result-value { font-weight: 700; color: var(--gray-900); }
.result-total-row { margin-top: 4px; padding-top: 14px; border-top: 2px solid rgba(139,92,246,0.3) !important; border-bottom: none !important; }
.result-total-label { font-size: 15px; font-weight: 800; color: var(--gray-800); }
.result-total-value { font-size: 20px; font-weight: 900; color: var(--primary); }
.result-note { font-size: 11px; color: var(--gray-400); margin-top: 10px; line-height: 1.6; }
.result-badge { background: rgba(139,92,246,0.12); color: var(--primary); font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 12px; }

/* Compare Layout */
.compare-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 8px; }
.compare-col { background: rgba(0,0,0,0.02); border: 1px solid var(--dark-border); border-radius: 12px; padding: 16px; }
.compare-col.highlight { border-color: rgba(139,92,246,0.3); background: rgba(139,92,246,0.06); }
.compare-col-title { font-size: 12px; font-weight: 800; color: var(--gray-400); margin-bottom: 12px; display: flex; align-items: center; gap: 6px; }
.compare-col.highlight .compare-col-title { color: var(--primary); }
.compare-row { display: flex; justify-content: space-between; padding: 6px 0; }
.compare-row + .compare-row { border-top: 1px solid rgba(0,0,0,0.05); }
.compare-key { font-size: 12px; color: var(--gray-500); font-weight: 500; }
.compare-val { font-size: 12px; font-weight: 700; color: var(--gray-700); }
.compare-total { margin-top: 8px; padding-top: 10px; border-top: 1px solid rgba(0,0,0,0.1); }
.compare-total .compare-val { font-size: 17px; font-weight: 900; color: var(--gray-900); }

/* ── Utilities ───────────────────────────────── */
.hidden { display: none !important; }

/* ── Explain Section ─────────────────────────── */
.explain-section { margin-bottom: 16px; }
.explain-toggle { width: 100%; padding: 14px 16px; background: #fff; border: 1px solid var(--primary); border-radius: 12px; font-size: 14px; font-weight: 700; color: var(--primary); cursor: pointer; text-align: left; display: flex; justify-content: space-between; align-items: center; font-family: inherit; }
.explain-toggle.open { border-bottom-left-radius: 0; border-bottom-right-radius: 0; border-bottom: 1px solid var(--primary); }
.etarrow { transition: transform .2s; }
.explain-toggle.open .etarrow { transform: rotate(180deg); }
.explain-body { display: none; background: #fff; border: 1px solid var(--primary); border-top: none; border-radius: 0 0 12px 12px; padding: 16px; font-size: 13px; color: var(--gray-600); line-height: 1.8; }
.explain-body.show { display: block; }
.explain-body h3 { font-size: 13px; font-weight: 700; color: var(--gray-800); margin: 12px 0 6px; padding-bottom: 4px; border-bottom: 1px solid var(--gray-200); }
.explain-body h3:first-child { margin-top: 0; }
.explain-body ul { padding-left: 16px; }
.explain-body li { margin-bottom: 4px; }

/* ── Action Buttons ──────────────────────────── */
.action-btn { display: inline-flex; align-items: center; gap: 6px; padding: 8px 14px; background: var(--gray-100); border: none; border-radius: 8px; font-size: 12px; font-weight: 600; color: var(--gray-600); cursor: pointer; font-family: inherit; }
.action-btn svg { width: 14px; height: 14px; stroke: currentColor; fill: none; stroke-width: 2; }

/* ── Siblings Navigation ─────────────────────── */
.siblings-section { margin-bottom: 24px; }
.siblings-title { font-size: 13px; font-weight: 700; color: var(--gray-500); margin-bottom: 10px; }
.siblings-grid { display: flex; flex-wrap: wrap; gap: 8px; }
.sibling-link { padding: 7px 14px; border-radius: 20px; font-size: 13px; font-weight: 600; text-decoration: none; background: #fff; border: 1.5px solid var(--gray-200); color: var(--gray-600); transition: all .15s; }
.sibling-link:hover { border-color: var(--primary); color: var(--primary); }
.sibling-link.current { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ── Footer ──────────────────────────────────── */
.site-footer { background: var(--gray-800); color: var(--gray-400); padding: 32px 20px; margin-top: 40px; }
.footer-inner { max-width: 800px; margin: 0 auto; }
.footer-links { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 16px; }
.footer-links a { color: var(--gray-400); text-decoration: none; font-size: 10px; }
.footer-links a:hover { color: #fff; }
.footer-copy { font-size: 10px; color: var(--gray-500); }

/* Toast */
.toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(20px); background: var(--gray-800); color: #fff; padding: 10px 20px; border-radius: 20px; font-size: 13px; font-weight: 600; opacity: 0; transition: all .3s; pointer-events: none; z-index: 9999; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ── Guide / FAQ Section ─────────────────────── */
.guide-section { display: grid; gap: 16px; margin-top: 24px; }
.guide-card { background: var(--dark-card, #fff); border: 1px solid var(--dark-border, rgba(0,0,0,0.06)); border-radius: 16px; padding: 24px; }
.guide-card h2 { font-size: 20px; font-weight: 900; letter-spacing: -0.4px; color: var(--gray-900); margin-bottom: 10px; }
.guide-card > p { font-size: 14px; line-height: 1.8; color: var(--gray-600); margin-bottom: 18px; }
.guide-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.guide-box { background: var(--primary-light); border: 1px solid var(--primary-border); border-radius: 14px; padding: 16px; display: flex; flex-direction: column; gap: 6px; }
.guide-box strong { font-size: 13px; color: var(--gray-900); }
.guide-box span { font-size: 12px; line-height: 1.6; color: var(--gray-600); }
/* Guide card content */
.guide-card .guide-table-wrap { overflow-x: auto; margin: 14px 0 16px; -webkit-overflow-scrolling: touch; }
.guide-card table { width: 100%; border-collapse: collapse; font-size: 13px; line-height: 1.7; }
.guide-card thead tr { background: var(--gray-50); }
.guide-card th { padding: 10px 12px; text-align: left; font-size: 12px; font-weight: 700; color: var(--gray-500); border-bottom: 1px solid var(--gray-200); }
.guide-card td { padding: 10px 12px; vertical-align: middle; font-size: 13px; color: var(--gray-600); border-bottom: 1px solid var(--gray-100); }
.guide-card tbody tr:last-child td { border-bottom: none; }
.guide-card td:first-child { font-weight: 600; color: var(--gray-800); white-space: nowrap; vertical-align: middle; }
.guide-card td:last-child { white-space: nowrap; font-weight: 600; vertical-align: middle; }
.guide-card h3 { font-size: 13px; font-weight: 700; color: var(--gray-500); margin: 20px 0 10px; padding-top: 16px; border-top: 1px solid var(--gray-100); }
.guide-card > ul { margin: 0 0 14px; padding-left: 18px; font-size: 13px; color: var(--gray-600); line-height: 1.8; }
.guide-card > ul li { margin-bottom: 4px; }
.guide-card > p:last-child { margin-bottom: 0; }
.guide-card .ref-links { margin-top: 14px; font-size: 13px; color: var(--gray-500); }
.guide-card .ref-links a { color: var(--primary); text-decoration: underline; }
.text-success { color: #16A34A !important; }
.text-warning { color: #D97706 !important; }
.text-danger { color: #DC2626 !important; }
.faq-card .faq-item + .faq-item { border-top: 1px solid var(--gray-100); margin-top: 14px; padding-top: 14px; }
.faq-item h3 { font-size: 14px; font-weight: 800; color: var(--gray-800); margin: 0 0 6px; padding-top: 0; border-top: none; }
.faq-item p { font-size: 13px; line-height: 1.8; color: var(--gray-600); }
.update-note { margin-top: 18px; font-size: 12px; font-weight: 500; color: var(--gray-500); background: var(--gray-50, #F9FAFB); border: 1px solid var(--dark-border, rgba(0,0,0,0.06)); border-radius: 10px; padding: 10px 14px; line-height: 1.6; }
.update-note a { color: var(--primary); font-weight: 600; }

/* ── Responsive ──────────────────────────────── */
@media (max-width: 767px) {
  .header-inner { padding: 0 16px; }
  .header-nav, .header-cta { display: none; }
  .hamburger { display: flex; }
  .page-wrap { padding: 16px 16px 60px; }
  .page-header { padding: 24px 20px 20px; }
  .guide-grid { grid-template-columns: 1fr; }
  .guide-card { padding: 20px; }
  .guide-card h2 { font-size: 18px; }
  .compare-cols { grid-template-columns: 1fr; }
}