/* ─────────────────────────────────────────────
   Design System — Apple 가이드 기반
   DESIGN-apple.md 디자인 토큰 적용
   ───────────────────────────────────────────── */

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

/* ── CSS Variables (Design Tokens) ──────────── */
:root {
  /* Colors */
  --color-primary: #0066cc;
  --color-primary-focus: #0071e3;
  --color-primary-on-dark: #2997ff;
  --color-ink: #1d1d1f;
  --color-ink-muted: #6e6e73;
  --color-ink-muted-48: #7a7a7a;
  --color-canvas: #ffffff;
  --color-canvas-parchment: #f5f5f7;
  --color-surface-pearl: #fafafc;
  --color-divider: #f0f0f0;
  --color-hairline: #e0e0e0;
  --color-on-primary: #ffffff;
  --color-danger: #ff3b30;
  --color-success: #34c759;
  --color-warning: #ff9500;
  --color-info: #5ac8fa;

  /* Typography */
  --font-display: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Inter', system-ui, sans-serif;
  --font-text: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Inter', system-ui, sans-serif;

  /* Spacing */
  --space-xxs: 4px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 17px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-xxl: 48px;
  --space-section: 80px;

  /* Radius */
  --radius-xs: 5px;
  --radius-sm: 8px;
  --radius-md: 11px;
  --radius-lg: 18px;
  --radius-pill: 9999px;

  /* Shadows */
  --shadow-card: 0 2px 12px rgba(0,0,0,0.08);
  --shadow-dropdown: 0 4px 24px rgba(0,0,0,0.12);
  --shadow-elevated: 0 8px 32px rgba(0,0,0,0.14);

  /* Sidebar */
  --sidebar-width: 260px;
  --nav-height: 52px;
}

/* ── Typography ─────────────────────────────── */
html {
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-text);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.47;
  letter-spacing: -0.374px;
  color: var(--color-ink);
  background: var(--color-canvas-parchment);
}

h1, h2, h3, h4 { font-family: var(--font-display); }

h1 {
  font-size: 40px;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.5px;
}

h2 {
  font-size: 28px;
  font-weight: 600;
  line-height: 1.14;
}

h3 {
  font-size: 21px;
  font-weight: 600;
  line-height: 1.19;
  letter-spacing: 0.231px;
}

.caption {
  font-size: 14px;
  line-height: 1.43;
  letter-spacing: -0.224px;
  color: var(--color-ink-muted);
}

/* ── Buttons ────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 11px 22px;
  font-family: var(--font-text);
  font-size: 17px;
  font-weight: 400;
  line-height: 1;
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-on-primary);
}
.btn-primary:hover {
  background: var(--color-primary-focus);
}

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}
.btn-secondary:hover {
  background: var(--color-primary);
  color: var(--color-on-primary);
}

.btn-danger {
  background: var(--color-danger);
  color: var(--color-on-primary);
}

.btn-sm {
  padding: 7px 16px;
  font-size: 14px;
}

/* ── Cards ──────────────────────────────────── */
.card {
  background: var(--color-canvas);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: var(--space-lg);
}

/* ── Tables ─────────────────────────────────── */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  background: var(--color-canvas);
}

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

thead {
  background: var(--color-surface-pearl);
}

th {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-ink-muted);
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-hairline);
}

td {
  padding: var(--space-sm) var(--space-md);
  font-size: 14px;
  border-bottom: 1px solid var(--color-divider);
}

tr:last-child td {
  border-bottom: none;
}

tr:hover {
  background: var(--color-surface-pearl);
}

/* ── Status Badges ──────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius-pill);
  letter-spacing: 0;
}

.badge-blue { background: #e8f4fd; color: #0066cc; }
.badge-green { background: #eaf9ef; color: #248a3d; }
.badge-orange { background: #fff3e0; color: #c93400; }
.badge-red { background: #fce8e6; color: #d93025; }
.badge-gray { background: #f0f0f0; color: #6e6e73; }

/* ── Forms ──────────────────────────────────── */
.form-group {
  margin-bottom: var(--space-md);
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: var(--space-xxs);
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  font-family: var(--font-text);
  font-size: 17px;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-sm);
  background: var(--color-canvas);
  color: var(--color-ink);
  transition: border-color 0.2s;
  outline: none;
}

.form-control:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0,102,204,0.15);
}

select.form-control {
  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 fill='%236e6e73' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

/* ── Layout ─────────────────────────────────── */
.layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--color-canvas);
  border-right: 1px solid var(--color-divider);
  overflow-y: auto;
  z-index: 100;
  display: flex;
  flex-direction: column;
}

.sidebar-logo {
  padding: var(--space-lg);
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 600;
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-divider);
}

.sidebar-nav {
  flex: 1;
  padding: var(--space-sm) 0;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px var(--space-lg);
  font-size: 14px;
  color: var(--color-ink-muted);
  text-decoration: none;
  transition: all 0.15s;
  border-radius: 0;
}

.sidebar-nav a:hover {
  background: var(--color-surface-pearl);
  color: var(--color-ink);
}

.sidebar-nav a.active {
  color: var(--color-primary);
  font-weight: 600;
  background: rgba(0,102,204,0.06);
}

.sidebar-section {
  padding: var(--space-md) var(--space-lg) var(--space-xs);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-ink-muted-48);
}

.content {
  margin-left: var(--sidebar-width);
  flex: 1;
  padding: var(--space-xl);
  max-width: 1200px;
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-xl);
}

.page-header h1 {
  font-size: 28px;
}

/* ── Login Page ─────────────────────────────── */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: var(--color-canvas-parchment);
}

.login-card {
  text-align: center;
  padding: var(--space-section) 60px;
  max-width: 440px;
}

.login-card h1 {
  margin-bottom: var(--space-sm);
}

.login-card p {
  color: var(--color-ink-muted);
  margin-bottom: var(--space-xl);
}

.login-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 14px 32px;
  background: var(--color-primary);
  color: var(--color-on-primary);
  border: none;
  border-radius: var(--radius-pill);
  font-size: 17px;
  font-weight: 400;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s;
}

.login-btn:hover {
  background: var(--color-primary-focus);
}

.login-btn svg {
  width: 20px;
  height: 20px;
}

/* ── Stats Cards ────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.stat-card {
  background: var(--color-canvas);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: var(--space-lg);
}

.stat-card .stat-value {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1;
}

.stat-card .stat-label {
  font-size: 14px;
  color: var(--color-ink-muted);
  margin-top: var(--space-xxs);
}

/* ── Empty State ────────────────────────────── */
.empty-state {
  text-align: center;
  padding: var(--space-section) var(--space-xl);
  color: var(--color-ink-muted);
}

.empty-state .emoji {
  font-size: 48px;
  margin-bottom: var(--space-md);
}

/* ── User Info (sidebar bottom) ─────────────── */
.sidebar-user {
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--color-divider);
  font-size: 13px;
  color: var(--color-ink-muted);
}

.sidebar-user .user-name {
  font-weight: 600;
  color: var(--color-ink);
  font-size: 14px;
}

/* ── Animations ─────────────────────────────── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.3s ease forwards;
}

/* ── Mobile Nav Toggle ─────────────────────────── */
.mobile-nav-toggle {
  display: none;
  position: fixed;
  top: var(--space-sm);
  left: var(--space-sm);
  z-index: 200;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--color-canvas);
  box-shadow: var(--shadow-card);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.mobile-nav-toggle svg {
  width: 20px;
  height: 20px;
  color: var(--color-ink);
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.3);
  z-index: 90;
}

/* ── Responsive: Tablet (≤1024px) ──────────────── */
@media (max-width: 1024px) {
  .content {
    max-width: 100%;
    padding: var(--space-lg);
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ── Responsive: Mobile (≤768px) ───────────────── */
@media (max-width: 768px) {
  /* 사이드바 숨기기 */
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    z-index: 110;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-overlay.active {
    display: block;
  }

  /* 모바일 네비 토글 표시 */
  .mobile-nav-toggle {
    display: flex;
  }

  /* 컨텐츠 전체폭 */
  .content {
    margin-left: 0;
    padding: var(--space-md);
    padding-top: 60px; /* 네비 토글 공간 */
  }

  /* 통계 카드 1열 */
  .stats-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  /* 페이지 헤더 */
  .page-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }

  .page-header h1 {
    font-size: 24px;
  }

  /* 테이블 가로 스크롤 */
  .table-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  table {
    min-width: 600px;
  }

  /* 카드 패딩 축소 */
  .card {
    padding: var(--space-md);
    border-radius: var(--radius-md);
  }

  /* 버튼 터치 친화적 크기 */
  .btn {
    padding: 13px 24px;
    min-height: 44px;
  }

  .btn-sm {
    padding: 10px 18px;
    min-height: 40px;
  }

  /* 폼 터치 친화적 */
  .form-control {
    padding: 12px 14px;
    font-size: 16px; /* iOS 확대 방지 */
  }

  /* 로그인 페이지 */
  .login-card {
    padding: var(--space-xl) var(--space-lg);
  }

  .login-card h1 {
    font-size: 28px;
  }
}

/* ── Responsive: Small Mobile (≤480px) ─────────── */
@media (max-width: 480px) {
  .stats-grid {
    gap: var(--space-sm);
  }

  .stat-card .stat-value {
    font-size: 28px;
  }

  h1 { font-size: 24px; }
  h2 { font-size: 21px; }
  h3 { font-size: 17px; }
}