/* ===== Design Tokens & CSS Variables ===== */
:root{
  --bg:#0b0d12;
  --panel:#111522;
  --card:#141a2b;
  --text:#e9ecf5;
  --muted:#a9b1c6;
  --line:rgba(255,255,255,.10);
  --primary:#7aa2ff;
  --good:#4ade80;
  --warn:#fbbf24;
  --bad:#fb7185;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --radius:16px;
  --radius2:22px;
  
  /* Spacing & Layout Variables */
  --gap: 12px;
  --space: 22px;
  
  /* 다크 UI 힌트 */
  color-scheme: dark;
}

/* ===== Enhanced Global Resets ===== */
*, *::before, *::after { 
  box-sizing: border-box; 
}

html, body {
  height: 100%;
  min-height: 100vh;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Noto Sans KR", Arial, sans-serif;
  background: radial-gradient(1200px 700px at 25% -10%, rgba(122,162,255,.18), transparent 55%),
              radial-gradient(900px 600px at 85% 10%, rgba(251,191,36,.12), transparent 55%),
              var(--bg);
  color: var(--text);
  line-height: 1.5;
}

/* 이미지 반응형 */
img, svg { 
  max-width: 100%; 
  display: block; 
}

/* 리스트 스타일 */
ul, ol { 
  padding-left: 1.2rem; 
}

/* 접근성을 고려한 링크 스타일 */
a {
  color: inherit; 
  text-decoration: none;
}

a:hover, a:focus {
  text-decoration: underline;
}

/* 포커스 스타일 유지 */
a:focus, button:focus, input:focus, select:focus, textarea:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

small {
  color: var(--muted);
}

.muted {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

/* ===== Layout Primitives ===== */
.container {
  max-width: 1120px; 
  margin: 0 auto; 
  padding: 0 16px;
}

.spacer {
  height: var(--space);
}

/* 12-column Grid System */
.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--gap);
}

.col-8 { grid-column: span 8; }
.col-4 { grid-column: span 4; }
.col-6 { grid-column: span 6; }
.col-12 { grid-column: span 12; } /* 항상 전체 너비 */

/* Form Grid System */
.form-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--gap);
}

.field { grid-column: span 6; }
.field.full { grid-column: span 12; }

/* KPI Grid */
.kpi {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap);
}

/* Button Row */
.btn-row {
  display: flex; 
  gap: 10px; 
  flex-wrap: wrap;
}

/* ===== Responsive Breakpoints ===== */
@media (min-width: 860px) {
  .container { 
    padding: 0 20px; 
  }
}

@media (max-width: 860px) {
  .col-8, .col-6, .col-4 { 
    grid-column: span 12; 
  }
  .field { 
    grid-column: span 12; 
  }
  .kpi { 
    grid-template-columns: repeat(2, 1fr); 
  }
}

/* ===== Foundation UI Components ===== */

/* Accessibility: keyboard focus */
:focus-visible {
  outline: 2px solid rgba(122,162,255,.7);
  outline-offset: 2px;
}

/* Link affordance */
a:hover {
  text-decoration: underline;
}

/* Header & Navigation */
.header {
  position: sticky; 
  top: 0; 
  z-index: 50;
  background: rgba(11,13,18,.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex; 
  align-items: center; 
  justify-content: space-between;
  padding: 12px 0;
  gap: 12px;
}

.brand {
  display: flex; 
  align-items: center; 
  gap: 10px;
  font-weight: 700;
}

.brand-badge {
  width: 34px; 
  height: 34px; 
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(122,162,255,.9), rgba(251,191,36,.75));
  box-shadow: var(--shadow);
}

.nav {
  display: flex; 
  align-items: center; 
  gap: 10px;
}

.nav a {
  color: var(--muted);
  padding: 8px 10px;
  border-radius: 12px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav a.active, .nav a:hover {
  color: var(--text);
  background: rgba(255,255,255,.06);
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
  color: var(--text);
  border-radius: 12px;
  padding: 8px 10px;
  cursor: pointer;
}

/* Buttons & Pills */
.btn {
  display: inline-flex; 
  align-items: center; 
  justify-content: center;
  border-radius: 14px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
  color: var(--text);
  cursor: pointer;
  font-weight: 600;
  text-decoration: none;
  transition: filter 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.btn.primary {
  border-color: rgba(122,162,255,.45);
  background: rgba(122,162,255,.14);
}

.btn:hover {
  filter: brightness(1.1);
}

.pill {
  display: inline-flex; 
  align-items: center; 
  gap: 8px;
  border-radius: 999px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
  color: var(--muted);
  font-size: 12px;
}

.pill.good { color: var(--good); }
.pill.warn { color: var(--warn); }
.pill.bad { color: var(--bad); }

/* Hero Section */
.hero {
  padding: 38px 0 18px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 16px;
  align-items: stretch;
}

.h1 {
  font-size: clamp(28px, 3vw, 44px);
  letter-spacing: -.02em;
  line-height: 1.1;
  margin: 0 0 10px;
}

.lead {
  color: var(--muted); 
  font-size: 15px; 
  margin: 0 0 16px;
}

/* Mobile Navigation */
@media (max-width: 860px) {
  .nav {
    display: none;
  }
  
  .nav-toggle {
    display: inline-flex;
  }
  
  .nav.mobile-open {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    padding: 10px 0 14px;
    border-top: 1px solid var(--line);
  }
  
  .header-inner {
    flex-wrap: wrap;
  }
  
  .hero-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== Content Blocks ===== */

/* Cards */
.card {
  background: rgba(20,26,43,.72);
  border: 1px solid var(--line);
  border-radius: var(--radius2);
  box-shadow: var(--shadow);
  padding: 16px;
}

.card h3 {
  margin: 0 0 10px; 
  font-size: 16px;
}

/* KPI Cards */
.kpi .card {
  padding: 14px;
}

.kpi .val {
  font-size: 18px; 
  font-weight: 800;
}

.kpi .lbl {
  color: var(--muted); 
  font-size: 12px;
}

/* Banners */
.banner {
  border-radius: var(--radius2);
  border: 1px solid rgba(251,191,36,.35);
  background: rgba(251,191,36,.10);
  padding: 12px 14px;
  color: var(--text);
}

.banner strong {
  color: var(--warn);
}

/* Banner variants (optional) */
.banner.info {
  border: 1px solid rgba(122,162,255,.35);
  background: rgba(122,162,255,.10);
}

.banner.good {
  border: 1px solid rgba(74,222,128,.35);
  background: rgba(74,222,128,.10);
}

.banner.bad {
  border: 1px solid rgba(251,113,133,.35);
  background: rgba(251,113,133,.10);
}

/* Placeholders & Loading States */
.placeholder {
  height: 220px;
  border-radius: var(--radius2);
  border: 1px solid var(--line);
  background: linear-gradient(90deg, rgba(255,255,255,.03), rgba(255,255,255,.07), rgba(255,255,255,.03));
  background-size: 240% 100%;
  animation: shimmer 2.4s infinite;
}

/* Placeholder size variants */
.placeholder.sm { height: 160px; }
.placeholder.lg { height: 320px; }

@keyframes shimmer {
  0% { background-position: 120% 0; }
  100% { background-position: -120% 0; }
}

@media (prefers-reduced-motion: reduce) {
  .placeholder { animation: none; }
}

/* Ad Slots */
.ad-slot {
  border-radius: var(--radius2);
  border: 1px dashed rgba(255,255,255,.18);
  padding: 14px;
  color: var(--muted);
  text-align: center;
  background: rgba(255,255,255,.02);
}

/* ===== Forms & Feedback ===== */

/* Form Elements */
label {
  display: block; 
  font-size: 12px; 
  color: var(--muted); 
  margin-bottom: 6px;
}

input, select, textarea {
  width: 100%;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(11,13,18,.40);
  color: var(--text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus, select:focus, textarea:focus {
  border-color: rgba(122,162,255,.55);
  box-shadow: 0 0 0 3px rgba(122,162,255,.1);
}

/* Form states */
input:invalid:not(:placeholder-shown) {
  border-color: rgba(251,113,133,.6);
}

input:disabled, select:disabled, textarea:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Data Display - Tables */
.table-wrap {
  overflow: auto; 
  border-radius: var(--radius2); 
  border: 1px solid var(--line);
}

table {
  width: 100%; 
  border-collapse: collapse; 
}

.table-wrap table {
  min-width: 760px;
}

th, td {
  padding: 12px 12px; 
  border-bottom: 1px solid var(--line); 
  text-align: left; 
  font-size: 13px;
}

th {
  color: var(--muted); 
  font-weight: 700; 
  background: rgba(255,255,255,.03);
}

tr:hover td {
  background: rgba(255,255,255,.02);
}

/* Footer */
.footer {
  margin-top: 26px;
  padding: 20px 0 30px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
}