/**
 * 维护助手设计系统 v4
 * Inspired by: Apple HIG · Tencent TDesign · Linear · Vercel
 * ─────────────────────────────────────────────────────────
 */

/* ═══════ Design Tokens ═══════ */
:root {
  /* ── Brand ── */
  --primary-color: #0071E3;
  --primary-light: #56A8FF;
  --primary-dark:  #0058B0;
  --primary-ultra-light: rgba(0,113,227,0.07);
  --secondary-color: #5856D6;
  --success-color: #30D158;
  --danger-color:  #FF453A;
  --warning-color: #FF9F0A;
  --info-color:    #64D2FF;

  /* ── Neutral (12-step) ── */
  --gray-50:  #FAFAFA;
  --gray-100: #F5F5F7;
  --gray-150: #EFEFEF;
  --gray-200: #E8E8ED;
  --gray-300: #D2D2D7;
  --gray-400: #AEAEB2;
  --gray-500: #86868B;
  --gray-600: #6E6E73;
  --gray-700: #48484A;
  --gray-800: #3A3A3C;
  --gray-900: #1D1D1F;

  /* ── Semantic ── */
  --bg-primary:   var(--gray-100);
  --bg-secondary: #FFFFFF;
  --bg-elevated:  #FFFFFF;
  --bg-inset:     var(--gray-50);
  --bg-canvas:    linear-gradient(170deg, #F5F5F7 0%, #EBE5FF 30%, #E8F4FF 60%, #F5F5F7 100%);
  --text-primary:   var(--gray-900);
  --text-secondary: var(--gray-600);
  --text-tertiary:  var(--gray-500);
  --text-quaternary: var(--gray-400);

  /* ── Borders ── */
  --border-color:        rgba(0,0,0,0.06);
  --border-color-strong: rgba(0,0,0,0.12);
  --border-card:         rgba(255,255,255,0.8);
  --divider:             rgba(0,0,0,0.04);

  /* ── Layout ── */
  --sidebar-width: 260px;
  --sidebar-collapsed-width: 72px;
  --header-height: 56px;

  /* ── Spacing (4px grid) ── */
  --space-0_5: 2px; --space-1: 4px; --space-1_5: 6px;
  --space-2: 8px; --space-2_5: 10px; --space-3: 12px; --space-3_5: 14px;
  --space-4: 16px; --space-5: 20px; --space-6: 24px;
  --space-8: 32px; --space-10: 40px; --space-12: 48px; --space-16: 64px;

  /* ── Radius ── */
  --radius-xs: 6px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* ── Shadows (multi-layer) ── */
  --shadow-xs:  0 1px 2px rgba(0,0,0,0.04);
  --shadow-sm:  0 1px 2px rgba(0,0,0,0.04), 0 2px 6px rgba(0,0,0,0.03);
  --shadow-md:  0 2px 4px rgba(0,0,0,0.03), 0 4px 16px rgba(0,0,0,0.05);
  --shadow-lg:  0 4px 8px rgba(0,0,0,0.03), 0 12px 32px rgba(0,0,0,0.07);
  --shadow-xl:  0 8px 16px rgba(0,0,0,0.04), 0 20px 56px rgba(0,0,0,0.09);
  --shadow-card: 0 1px 1px rgba(0,0,0,0.02),
                 0 2px 4px rgba(0,0,0,0.02),
                 0 4px 12px rgba(0,0,0,0.04);
  --shadow-card-hover: 0 2px 4px rgba(0,0,0,0.03),
                       0 8px 28px rgba(0,0,0,0.08),
                       0 0 0 1px rgba(0,113,227,0.08);
  --shadow-glass: inset 0 0.5px 0 rgba(255,255,255,0.7);

  /* ── Typography Scale (Apple 8-level) ── */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
               "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", SFMono-Regular, ui-monospace, Menlo, Consolas, monospace;
  --fs-xs: 11px; --fs-sm: 13px; --fs-base: 15px; --fs-md: 17px;
  --fs-lg: 20px; --fs-xl: 24px; --fs-2xl: 28px; --fs-3xl: 34px;
  --lh-tight: 1.15; --lh-snug: 1.25; --lh-normal: 1.5; --lh-relaxed: 1.65;
  --fw-regular: 400; --fw-medium: 500; --fw-semi: 600; --fw-bold: 700;
  --tracking-tight: -0.035em; --tracking-snug: -0.02em;
  --tracking-normal: 0; --tracking-wide: 0.04em;

  /* ── Icon Sizes ── */
  --icon-xs: 12px; --icon-sm: 14px; --icon-md: 16px;
  --icon-lg: 20px; --icon-xl: 24px;

  /* ── Motion ── */
  --ease-spring: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-out:    cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast:   120ms;
  --duration-normal: 200ms;
  --duration-slow:   350ms;
  --duration-enter:  500ms;

  /* ── Compat aliases ── */
  --maint-primary: var(--primary-color);
  --maint-primary-hover: var(--primary-dark);
  --maint-secondary: var(--primary-light);
  --maint-cta: #FF9500;
  --maint-bg: var(--bg-primary);
  --maint-bg-card: var(--bg-elevated);
  --maint-text: var(--text-primary);
  --maint-text-muted: var(--text-secondary);
  --maint-border: var(--border-color);
  --maint-success: var(--success-color);
  --maint-danger: var(--danger-color);
  --maint-warning: var(--warning-color);
  --maint-sidebar-w: var(--sidebar-width);
  --maint-header-h: var(--header-height);
  --maint-font-heading: var(--font-sans);
  --maint-font-body: var(--font-sans);
  --maint-transition: var(--duration-normal) var(--ease-spring);
  --maint-shadow: var(--shadow-sm);
  --maint-shadow-lg: var(--shadow-lg);
}

/* ═══════ Base ═══════ */
.maint-body {
  font-family: var(--font-sans);
  min-height: 100vh;
  overflow-x: hidden;
  color: var(--text-primary);
  background: var(--bg-canvas);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size: 14px;
  line-height: 1.5;
  letter-spacing: -0.006em;
}

/* ═══════ Sidebar ═══════ */
.sidebar {
  position: fixed;
  left: 0; top: 0;
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  height: 100vh;
  background: rgba(245,245,247,0.72);
  backdrop-filter: blur(40px) saturate(180%);
  -webkit-backdrop-filter: blur(40px) saturate(180%);
  border-right: 0.5px solid var(--border-color);
  z-index: 1000;
  overflow-y: auto;
  overflow-x: hidden;
  transition: transform var(--duration-slow) var(--ease-out);
  flex-shrink: 0;
  overscroll-behavior: contain;
}
.sidebar::-webkit-scrollbar { width: 5px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb {
  background: rgba(0,0,0,0.1);
  border-radius: 100px;
}
.sidebar::-webkit-scrollbar-thumb:hover { background: rgba(0,0,0,0.18); }

.sidebar-header, .sidebar .sidebar-header {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-5);
  border-bottom: 0.5px solid rgba(0,0,0,0.06);
}
.sidebar-header h1, .sidebar .sidebar-header h1 {
  font-size: 15px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--text-primary);
  letter-spacing: -0.025em;
}
.sidebar-header h1 i {
  font-size: 18px;
  color: var(--primary-color);
}
.sidebar-header a, .sidebar .sidebar-header a {
  color: inherit;
  text-decoration: none;
}

.sidebar-toggle, .sidebar .sidebar-toggle {
  background: transparent;
  border: none;
  color: var(--text-tertiary);
  width: 30px; height: 30px;
  border-radius: var(--radius-xs);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--duration-fast);
  font-size: 13px;
}
.sidebar-toggle:hover {
  background: rgba(0,0,0,0.05);
  color: var(--text-primary);
}
.sidebar-toggle:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 1px;
}

.sidebar-menu, .sidebar .sidebar-menu {
  padding: var(--space-2) 0;
}
.menu-section, .sidebar .menu-section {
  margin-bottom: var(--space-1);
}
.menu-section-title, .sidebar .menu-section-title {
  padding: var(--space-3) var(--space-5) var(--space-1);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
  user-select: none;
}

.menu-item, .sidebar .menu-item {
  display: flex;
  align-items: center;
  margin: var(--space-0_5) var(--space-2);
  padding: var(--space-2_5) var(--space-4);
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: var(--fw-medium);
  transition: all var(--duration-fast) var(--ease-smooth);
  cursor: pointer;
  position: relative;
}
.menu-item:hover, .sidebar .menu-item:hover {
  background: rgba(0,0,0,0.04);
  color: var(--text-primary);
}
.menu-item.active, .sidebar .menu-item.active {
  background: var(--primary-ultra-light);
  color: var(--primary-color);
  font-weight: var(--fw-semi);
}
.menu-item:active { transform: scale(0.98); }
.menu-item:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: -1px;
}
.menu-item i, .sidebar .menu-item i {
  width: 20px;
  font-size: var(--icon-md);
  margin-right: var(--space-2);
  text-align: center;
  flex-shrink: 0;
  opacity: 0.55;
  transition: opacity var(--duration-fast);
}
.menu-item:hover i { opacity: 0.8; }
.menu-item.active i {
  opacity: 1;
  color: var(--primary-color);
}
.menu-item span, .sidebar .menu-item span {
  white-space: nowrap;
}

/* ═══════ Main Layout ═══════ */
.main-wrapper {
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  transition: margin-left var(--duration-slow) var(--ease-out);
  position: relative;
  z-index: 1;
}

.main-header {
  height: var(--header-height);
  background: rgba(245,245,247,0.6);
  backdrop-filter: blur(40px) saturate(180%);
  -webkit-backdrop-filter: blur(40px) saturate(180%);
  border-bottom: 0.5px solid var(--divider);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-6);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-title, .main-header .header-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  letter-spacing: -0.02em;
}
.header-title i { color: var(--primary-color); font-size: 15px; }

.header-actions, .main-header .header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.header-actions a, .main-header .header-actions a {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: all var(--duration-fast);
  cursor: pointer;
  color: var(--text-secondary);
}
.header-actions a:hover {
  background: rgba(0,0,0,0.04);
  color: var(--text-primary);
}
.header-actions .btn-primary {
  background: var(--primary-color);
  color: #fff;
}
.header-actions .btn-primary:hover {
  background: var(--primary-dark);
}
.header-actions .btn-logout { color: var(--danger-color); }
.header-actions .btn-logout:hover { background: rgba(255,69,58,0.06); }
.header-actions a:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* ═══════ Content ═══════ */
.main-content {
  padding: var(--space-6);
  max-width: 100%;
  overflow-x: hidden;
}

/* ═══════ Card System ═══════ */
.maint-card, .maint-body .card, .function-card {
  background: var(--bg-elevated);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  margin-bottom: var(--space-5);
  border: 0.5px solid var(--border-color);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--duration-normal) var(--ease-smooth);
}
.function-card .card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
  gap: var(--space-3);
}
.function-card .card-header h2 {
  font-size: 17px;
  font-weight: 650;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  letter-spacing: -0.025em;
}
.function-card .card-header h2 i {
  color: var(--primary-color);
  font-size: 16px;
}
.mc-hint { font-size: 13px; color: var(--text-tertiary); }
.maint-body .receipt-edit-card { max-width: 640px; }

/* ═══════ Buttons ═══════ */
.btn {
  padding: 7px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--duration-fast);
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-sans);
  line-height: 1.4;
  user-select: none;
}
.btn:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}
.btn:active { transform: scale(0.97); }
.btn-primary {
  background: var(--primary-color);
  color: #fff;
  box-shadow: 0 1px 2px rgba(0,113,227,0.2);
}
.btn-primary:hover {
  background: var(--primary-dark);
  box-shadow: 0 2px 6px rgba(0,113,227,0.25);
}
.btn-success { background: var(--success-color); color: #fff; }
.btn-success:hover { filter: brightness(0.95); }
.btn-danger { background: var(--danger-color); color: #fff; }
.btn-danger:hover { filter: brightness(0.95); }
.btn-outline {
  background: transparent;
  color: var(--primary-color);
  border: 1px solid var(--border-color-strong);
}
.btn-outline:hover {
  background: var(--primary-ultra-light);
  border-color: rgba(0,113,227,0.3);
}
.btn-sm { padding: 4px 10px; font-size: 12px; border-radius: var(--radius-xs); }
.btn:disabled { opacity: 0.38; pointer-events: none; }
.maint-btn {
  padding: 7px 16px; border-radius: var(--radius-sm); font-size: 13px; font-weight: 500;
  cursor: pointer; transition: all var(--duration-fast); border: none;
  display: inline-flex; align-items: center; gap: 5px;
}
.maint-btn:focus-visible { outline: 2px solid var(--primary-color); outline-offset: 2px; }

/* ═══════ Tables ═══════ */
.maint-body .card table, .maint-body .function-card table {
  width: 100%;
  border-collapse: collapse;
}
.maint-body .card th, .maint-body .card td,
.maint-body .function-card th, .maint-body .function-card td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 0.5px solid var(--divider);
  font-size: 13px;
}
.maint-body .card th, .maint-body .function-card th {
  background: var(--gray-50);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.maint-body .card tbody tr:hover,
.maint-body .function-card tbody tr:hover {
  background: rgba(0,0,0,0.015);
}
.maint-body .receipt-edit-table,
.maint-body .receipt-items-table { border-radius: var(--radius-md); overflow: hidden; }
.maint-body .receipt-items-table th { background: var(--gray-50); font-weight: 600; }
.maint-body .receipt-edit-table .label { background: var(--gray-50); font-weight: 600; }
.maint-body .card .btn-sm, .maint-body .function-card .btn-sm {
  padding: 4px 8px; font-size: 12px; border-radius: var(--radius-xs);
  text-decoration: none; margin-right: 2px; cursor: pointer;
  display: inline-flex; align-items: center; gap: 3px;
}

/* ═══════ Stat Cards ═══════ */
.maint-body .stat-card {
  text-align: center;
  padding: var(--space-4);
  background: var(--gray-50);
  border-radius: var(--radius-md);
  border: 0.5px solid var(--border-color);
}
.maint-body .stat-num {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary-color);
  letter-spacing: -0.03em;
}
.maint-body .stat-label {
  font-size: 12px;
  color: var(--text-tertiary);
  margin-top: 2px;
}

/* ═══════ Forms ═══════ */
.maint-body .form-group label {
  color: var(--text-primary);
  font-weight: 500;
  font-size: 13px;
}
.maint-body .form-group input,
.maint-body .form-group select,
.maint-body .form-group textarea {
  border: 1px solid var(--border-color-strong);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  padding: 8px 12px;
  transition: border-color var(--duration-fast), box-shadow var(--duration-fast);
  background: #fff;
}
.maint-body .form-group input:focus,
.maint-body .form-group select:focus,
.maint-body .form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(0,113,227,0.1);
}

/* ═══════ Alert ═══════ */
.alert {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  font-size: 13px;
  margin-bottom: var(--space-4);
}
.alert-success { background: rgba(48,209,88,0.08); color: #1a7a34; border: 0.5px solid rgba(48,209,88,0.2); }
.alert-danger  { background: rgba(255,69,58,0.06); color: #cc2d25; border: 0.5px solid rgba(255,69,58,0.15); }
.alert-warning { background: rgba(255,214,10,0.1); color: #8a6d00; border: 0.5px solid rgba(255,214,10,0.25); }
.alert-info    { background: rgba(0,113,227,0.06); color: #0055b3; border: 0.5px solid rgba(0,113,227,0.12); }

/* ═══════ Responsive ═══════ */
@media (max-width: 1024px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-wrapper { margin-left: 0; }
}
@media (max-width: 768px) {
  .main-header { height: 48px; padding: 0 var(--space-4); }
  .main-header .header-title { font-size: 14px; }
  .main-content { padding: var(--space-4); }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0ms !important;
    animation-duration: 0ms !important;
  }
}

/* Dark Mode */
.maint-body[data-theme="dark"] {
  --primary-color: #409CFF; --primary-light: #64B5F6; --primary-dark: #2D8CF0;
  --primary-ultra-light: rgba(64,156,255,0.12);
  --gray-50: #1C1C1E; --gray-100: #1C1C1E; --gray-150: #2C2C2E;
  --gray-200: #3A3A3C; --gray-300: #48484A; --gray-400: #636366;
  --gray-500: #8E8E93; --gray-600: #AEAEB2; --gray-700: #C7C7CC;
  --gray-800: #D1D1D6; --gray-900: #F5F5F7;
  --bg-primary: #1C1C1E; --bg-secondary: #2C2C2E; --bg-elevated: #2C2C2E;
  --bg-canvas: #000000;
  --text-primary: #F5F5F7; --text-secondary: #AEAEB2; --text-tertiary: #8E8E93;
  --border-color: rgba(255,255,255,0.08); --border-color-strong: rgba(255,255,255,0.14);
  --border-card: rgba(255,255,255,0.06); --divider: rgba(255,255,255,0.06);
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.5);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.5);
  --shadow-card: 0 1px 2px rgba(0,0,0,0.3), 0 2px 8px rgba(0,0,0,0.2);
  --shadow-card-hover: 0 2px 4px rgba(0,0,0,0.3), 0 8px 24px rgba(0,0,0,0.3), 0 0 0 1px rgba(64,156,255,0.15);
}
.maint-body[data-theme="dark"] .sidebar {
  background: rgba(44,44,46,0.85);
  border-right-color: rgba(255,255,255,0.08);
}
.maint-body[data-theme="dark"] .main-header {
  background: rgba(28,28,30,0.8);
  border-bottom-color: rgba(255,255,255,0.06);
}
.maint-body[data-theme="dark"] .sidebar-header {
  border-bottom-color: rgba(255,255,255,0.06);
}
.maint-body[data-theme="dark"] .menu-item:hover { background: rgba(255,255,255,0.06); }
.maint-body[data-theme="dark"] .memo-card,
.maint-body[data-theme="dark"] .memo-modal-content { background: #2C2C2E; }
.maint-body[data-theme="dark"] .memo-search input { background: #3A3A3C; color: #F5F5F7; border-color: rgba(255,255,255,0.1); }
.maint-body[data-theme="dark"] .btn-primary { box-shadow: 0 1px 3px rgba(0,0,0,0.4); }
.maint-body[data-theme="dark"] .theme-toggle { background: rgba(255,255,255,0.08); color: #AEAEB2; }
.maint-body[data-theme="dark"] .theme-toggle:hover { background: rgba(255,255,255,0.12); color: #F5F5F7; }

/* Theme Toggle Button */
.theme-toggle { border: none; cursor: pointer; }

/* ═══════ Animations ═══════ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
.anim-enter { animation: fadeInUp var(--duration-enter) var(--ease-out) both; }
.anim-enter-d1 { animation-delay: 60ms; }
.anim-enter-d2 { animation-delay: 120ms; }
.anim-enter-d3 { animation-delay: 180ms; }
.anim-enter-d4 { animation-delay: 240ms; }
.anim-enter-d5 { animation-delay: 300ms; }
.anim-enter-d6 { animation-delay: 360ms; }

/* ═══════ Skeleton Loading ═══════ */
.skeleton {
  background: linear-gradient(90deg, var(--gray-150) 25%, var(--gray-100) 50%, var(--gray-150) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}
.skeleton-text { height: 14px; width: 80%; }
.skeleton-title { height: 20px; width: 60%; }
.skeleton-circle { border-radius: 50%; }

/* ═══════ Empty State ═══════ */
.empty-state {
  padding: var(--space-16) var(--space-8);
  text-align: center;
  color: var(--text-tertiary);
}
.empty-state-icon {
  width: 64px; height: 64px; border-radius: var(--radius-xl);
  background: var(--primary-ultra-light);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto var(--space-4);
  font-size: var(--icon-xl); color: var(--primary-color);
}
.empty-state h3 { font-size: var(--fs-md); font-weight: var(--fw-semi); color: var(--text-primary); margin-bottom: var(--space-1); }
.empty-state p { font-size: var(--fs-sm); max-width: 320px; margin: 0 auto; line-height: var(--lh-relaxed); }

/* ═══════ Global focus-visible ═══════ */
:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ═══════ Extra breakpoints ═══════ */
@media (max-width: 1280px) {
  .dash-stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .main-header { padding: 0 var(--space-4); }
  .main-content { padding: var(--space-3); }
}