/* ========================================
   Email Workers Console - Style System
   ======================================== */

/* === CSS Variables === */
:root {
  /* Colors - Dark Terminal Palette */
  --bg-primary: #0a0e14;
  --bg-secondary: #12161e;
  --bg-tertiary: #1a1f2b;
  --bg-elevated: #222936;

  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-tertiary: #6e7681;

  --accent-primary: #2bbdcd;
  --accent-secondary: #ff6b9d;
  --accent-success: #3fb950;
  --accent-warning: #f0883e;
  --accent-danger: #f85149;

  --border-subtle: #30363d;
  --border-default: #444c56;
  --border-emphasis: #6e7681;

  /* Typography */
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --font-sans: 'Inter Tight', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Space Grotesk', var(--font-sans);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(0, 217, 255, 0.3);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

  --accent-primary-rgb: 0, 217, 255;
  --accent-secondary-rgb: 255, 107, 157;
}

/* Colors - Light Terminal Palette */
[data-theme="light"] {
  --bg-primary: #f8f9fa;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f3f5;
  --bg-elevated: #e9ecef;

  --text-primary: #212529;
  --text-secondary: #495057;
  --text-tertiary: #868e96;

  --accent-primary: #0056b3;
  --accent-secondary: #d63384;
  --accent-success: #198754;
  --accent-warning: #fd7e14;
  --accent-danger: #dc3545;

  --border-subtle: #e9ecef;
  --border-default: #dee2e6;
  --border-emphasis: #ced4da;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 20px rgba(0, 86, 179, 0.2);

  --accent-primary-rgb: 0, 86, 179;
  --accent-secondary-rgb: 214, 51, 132;
}

/* === Reset & Base === */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

/* === Typography === */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: 1.75rem;
  color: var(--text-primary);
}

h3 {
  font-size: 1.25rem;
  color: var(--text-primary);
}

code, pre {
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

code {
  background: var(--bg-tertiary);
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
  color: var(--accent-primary);
  border: 1px solid var(--border-subtle);
}

pre {
  background: var(--bg-secondary);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
  border: 1px solid var(--border-default);
}

/* === Layout === */
.page-shell {
  min-height: 100vh;
  background-color: var(--bg-primary);
  background-image:
    radial-gradient(circle at 20% 20%, rgba(var(--accent-primary-rgb, 0, 217, 255), 0.05) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(var(--accent-secondary-rgb, 255, 107, 157), 0.05) 0%, transparent 50%);
  padding: var(--space-xl) var(--space-md);
  transition: background-color var(--transition-slow);
}

.wrap {
  max-width: 1400px;
  margin: 0 auto;
}

/* === Hero Section === */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
  padding: var(--space-xl);
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg,
    transparent,
    var(--accent-primary) 30%,
    var(--accent-secondary) 70%,
    transparent
  );
  animation: shimmer 3s infinite;
}

@keyframes shimmer {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

.hero-left {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.hero-right {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-md);
}

.hero-copy {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-primary);
  opacity: 0.8;
}

.hero-text {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
}

/* === Auth Section === */
.hero-auth {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.auth-label {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.auth-btns {
  display: flex;
  gap: var(--space-sm);
}

/* === Status Bar === */
.status-bar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  transition: all var(--transition-base);
}

.status-bar[data-kind="info"] {
  border-color: var(--accent-primary);
  background: rgba(var(--accent-primary-rgb), 0.05);
}

.status-bar[data-kind="success"] {
  border-color: var(--accent-success);
  background: color-mix(in srgb, var(--accent-success) 5%, transparent);
}

.status-bar[data-kind="warning"] {
  border-color: var(--accent-warning);
  background: color-mix(in srgb, var(--accent-warning) 5%, transparent);
}

.status-bar[data-kind="error"] {
  border-color: var(--accent-danger);
  background: color-mix(in srgb, var(--accent-danger) 5%, transparent);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-tertiary);
  animation: pulse 2s infinite;
}

.status-bar[data-kind="info"] .status-dot {
  background: var(--accent-primary);
}

.status-bar[data-kind="success"] .status-dot {
  background: var(--accent-success);
}

.status-bar[data-kind="warning"] .status-dot {
  background: var(--accent-warning);
}

.status-bar[data-kind="error"] .status-dot {
  background: var(--accent-danger);
}

.status-bar[data-active="1"] .status-dot {
  animation: pulse 1s infinite;
}

.status-bar[data-active="0"] .status-dot {
  animation: none;
  opacity: 0.5;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.9); }
}

.status-bar-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-sm);
}

/* === Buttons === */
button, .nav-link {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  white-space: nowrap;
}

button:disabled, .nav-link:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.primary {
  background: var(--accent-primary);
  color: #ffffff;
  font-weight: 600;
  box-shadow: 0 0 0 0 rgba(var(--accent-primary-rgb), 0.4);
}

.primary:hover:not(:disabled) {
  background: color-mix(in srgb, var(--accent-primary) 85%, white);
  box-shadow: 0 0 20px rgba(var(--accent-primary-rgb), 0.4);
  transform: translateY(-1px);
}

.primary:active:not(:disabled) {
  transform: translateY(0);
}

.secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-default);
}

.secondary:hover:not(:disabled) {
  background: var(--bg-tertiary);
  border-color: var(--border-emphasis);
}

.ghost, .ghost-btn {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.ghost:hover:not(:disabled), .ghost-btn:hover:not(:disabled) {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border-default);
}

.danger {
  background: var(--accent-danger);
  color: white;
  font-weight: 600;
}

.danger:hover:not(:disabled) {
  background: color-mix(in srgb, var(--accent-danger) 85%, white);
  box-shadow: 0 0 20px rgba(var(--accent-danger), 0.4);
}

/* === Inputs === */
input[type="text"],
input[type="password"],
input[type="number"],
input[type="datetime-local"],
select {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  width: 100%;
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(var(--accent-primary-rgb), 0.1);
}

input::placeholder {
  color: var(--text-tertiary);
}

/* === Panels === */
.panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
}

.section-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.panel-note {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  border-left: 3px solid var(--accent-primary);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
}

.panel-note strong {
  display: block;
  color: var(--accent-primary);
  margin-bottom: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* === Layout Grid === */
.layout-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

/* === Filter Panel === */
.filter-panel {
  position: sticky;
  top: var(--space-md);
  z-index: 10;
  transition: position var(--transition-base);
}

.filter-panel[data-expanded="true"] {
  position: relative;
  top: auto;
}

.filter-bar {
  display: flex;
  align-items: flex-end;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.filter-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  flex: 1;
  min-width: 200px;
}

.filter-field label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.filter-details {
  margin-top: var(--space-lg);
  animation: slideDown var(--transition-base);
}

.filter-details[hidden] {
  display: none;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.filter-body {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.filter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
}

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.field label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.filter-actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

/* === Section Header === */
.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-lg);
}

.section-note {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  margin-top: var(--space-xs);
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-secondary);
  background: rgba(var(--accent-secondary-rgb), 0.1);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(var(--accent-secondary-rgb), 0.2);
  white-space: nowrap;
}

/* === Pagination === */
.pagination-bar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  justify-content: flex-end;
}

.pagination-pill {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
}

/* === Table === */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

thead {
  background: var(--bg-elevated);
  border-bottom: 2px solid var(--border-emphasis);
}

th {
  text-align: left;
  padding: var(--space-md);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.75rem;
}

td {
  padding: var(--space-md);
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

tbody tr {
  transition: background var(--transition-fast);
}

tbody tr:hover {
  background: var(--bg-elevated);
}

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

.empty {
  text-align: center;
  color: var(--text-tertiary);
  padding: var(--space-2xl) !important;
  font-style: italic;
}

.col-time { width: 180px; }
.col-to { width: 25%; }
.col-from { width: 25%; }
.col-subject { width: auto; }
.col-actions {
  width: 100px;
  text-align: right;
  position: sticky;
  right: 0;
  background: var(--bg-tertiary);
  z-index: 1;
}

.table-wrap th.col-actions {
  background: var(--bg-elevated);
}

.table-wrap td.col-actions::before {
  content: '';
  position: absolute;
  left: -5px;
  top: 0;
  bottom: 0;
  width: 5px;
  background: linear-gradient(to right, transparent, rgba(0,0,0,0.1));
}

tbody tr:hover td.col-actions {
  background: var(--bg-elevated);
}

/* === Toast Notifications === */
.toast-container {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  pointer-events: none;
}

.toast {
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-primary);
  pointer-events: auto;
  animation: slideInRight 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  transition: opacity 0.3s, transform 0.3s;
  max-width: 350px;
  word-break: break-word;
}

@keyframes slideInRight {
  from {
    transform: translateX(120%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.toast.hiding {
  opacity: 0;
  transform: translateX(120%);
}

.toast[data-kind="info"] {
  border-left: 4px solid var(--accent-primary);
}

.toast[data-kind="success"] {
  border-left: 4px solid var(--accent-success);
}

.toast[data-kind="warning"] {
  border-left: 4px solid var(--accent-warning);
}

.toast[data-kind="error"] {
  border-left: 4px solid var(--accent-danger);
}

/* === Detail Grid === */
.detail-grid {
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-md);
}

.detail-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.detail-card strong {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-primary);
}

.body-box {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
  max-height: 50vh;
  overflow-y: auto;
  line-height: 1.7;
  word-break: break-word;
}

.mail-html-frame {
  width: 100%;
  min-height: 60vh;
  height: auto;
  border: none;
  border-radius: var(--radius-sm);
  background: white;
  transition: opacity var(--transition-base);
}

/* iframe Dark mode filter trick */
html[data-theme="dark"] .mail-html-frame {
  /* 移除全局反转，避免大部分HTML邮件色彩严重失真，采用基础白色底板呈现邮件原貌 */
  background: white;
}

.meta-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  overflow: hidden;
}

.meta-card strong {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.meta-card span {
  font-size: 0.875rem;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.raw-box {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
  max-height: 300px;
  overflow: auto;
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--text-secondary);
}

.header-table {
  width: 100%;
  table-layout: fixed;
}
.header-table td {
  padding: var(--space-xs) 0;
  border-bottom: 1px solid var(--border-subtle);
}
.header-table td:first-child {
  width: 150px;
  font-weight: 600;
  color: var(--text-secondary);
}
.header-table td:last-child {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: pointer;
  color: var(--text-primary);
  font-family: var(--font-mono);
}
.header-table td:last-child:hover {
  background: var(--bg-elevated);
}

.toolbar {
  display: flex;
  gap: var(--space-sm);
  justify-content: flex-end;
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-default);
}

/* === Documentation Specific === */
.top-links {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.hero-actions {
  display: flex;
  gap: var(--space-sm);
}

.doc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-lg);
}

.doc-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  transition: all var(--transition-base);
}

.doc-card:hover {
  border-color: var(--accent-primary);
  box-shadow: 0 0 20px rgba(var(--accent-primary-rgb), 0.15);
  transform: translateY(-2px);
}

.doc-card h3 {
  color: var(--accent-primary);
}

.doc-card .small {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
  background: var(--bg-tertiary);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  display: inline-block;
  border: 1px solid var(--border-subtle);
}

.doc-card p {
  color: var(--text-secondary);
  line-height: 1.7;
}

.code-box {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--text-primary);
}

.doc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.doc-list li {
  padding-left: var(--space-lg);
  position: relative;
  color: var(--text-secondary);
  line-height: 1.7;
}

.doc-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent-primary);
  font-weight: bold;
}

.doc-list code {
  font-size: 0.85em;
}

.small {
  font-size: 0.875rem;
  color: var(--text-tertiary);
}

/* === Utilities === */
[hidden] {
  display: none !important;
}

/* === Scrollbar === */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-emphasis);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-primary);
}

/* === Three-column Layout === */
.three-col-layout {
  display: flex;
  height: calc(100vh - var(--space-2xl) * 2 - 180px);
  min-height: 600px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  margin-top: var(--space-xl);
}

.col-folders {
  width: 240px;
  flex-shrink: 0;
  border-right: 1px solid var(--border-default);
  background: var(--bg-secondary);
  display: flex;
  flex-direction: column;
}

.col-folders-head {
  padding: var(--space-md);
  border-bottom: 1px solid var(--border-subtle);
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.folder-list {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.folder-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 0.875rem;
}

.folder-item:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.folder-item.active {
  background: color-mix(in srgb, var(--accent-primary) 10%, transparent);
  color: var(--accent-primary);
  font-weight: 500;
}

.folder-count {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--bg-elevated);
  padding: 2px 8px;
  border-radius: 10px;
}

.folder-item.active .folder-count {
  background: var(--accent-primary);
  color: white;
}

.col-mails {
  width: 320px;
  flex-shrink: 0;
  border-right: 1px solid var(--border-default);
  background: var(--bg-secondary);
  display: flex;
  flex-direction: column;
}

.col-mails-head {
  padding: var(--space-md);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.col-mails-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
}

.search-box {
  position: relative;
}

.search-box input {
  padding-left: 28px;
  padding-right: 8px;
  padding-top: 6px;
  padding-bottom: 6px;
}

.search-box svg {
  position: absolute;
  left: 8px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
}

.mail-list {
  flex: 1;
  overflow-y: auto;
}

.mail-item {
  padding: var(--space-md);
  border-bottom: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  gap: var(--space-sm);
}

.mail-item:hover {
  background: var(--bg-tertiary);
}

.mail-item.active {
  background: color-mix(in srgb, var(--accent-primary) 5%, transparent);
  border-left: 3px solid var(--accent-primary);
}

.mail-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 0.875rem;
  flex-shrink: 0;
}

.mail-item-content {
  flex: 1;
  min-width: 0;
}

.mail-item-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 2px;
}

.mail-item-sender {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mail-item-time {
  font-size: 0.7rem;
  color: var(--text-tertiary);
  white-space: nowrap;
}

.mail-item-subject {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 4px;
}

.mail-item-preview {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.4;
}

.col-detail {
  flex: 1;
  background: var(--bg-primary);
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.col-detail-empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  gap: var(--space-md);
}

.col-detail-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.detail-header-bar {
  padding: var(--space-md) var(--space-xl);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-secondary);
}

.detail-scroll-area {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-xl);
}

.detail-subject {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
}

.detail-sender-info {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
  align-items: center;
}

.detail-sender-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.detail-sender-details {
  flex: 1;
}

.detail-sender-name {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.detail-sender-email {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  font-weight: normal;
}

.detail-recipient {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.detail-time {
  font-size: 0.875rem;
  color: var(--text-tertiary);
}

.detail-body-content {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  border: 1px solid var(--border-subtle);
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.detail-body-content iframe {
  width: 100%;
  min-height: 500px;
  border: none;
  background: white;
  border-radius: var(--radius-sm);
}

.detail-attachments-area {
  margin-top: var(--space-xl);
  border-top: 1px solid var(--border-subtle);
  padding-top: var(--space-lg);
}

.detail-attachments-title {
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

/* === Responsive adjustments for 3-col === */
@media (max-width: 1024px) {
  .col-folders {
    width: 200px;
  }
  .col-mails {
    width: 280px;
  }
}

@media (max-width: 768px) {
  .three-col-layout {
    flex-direction: column;
    height: auto;
    min-height: 0;
  }
  .col-folders {
    width: 100%;
    height: 150px;
    border-right: none;
    border-bottom: 1px solid var(--border-default);
  }
  .col-mails {
    width: 100%;
    height: 400px;
    border-right: none;
    border-bottom: 1px solid var(--border-default);
  }
  .col-detail {
    height: 600px;
  }
}

/* === Responsive === */
@media (max-width: 1024px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .doc-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .page-shell {
    padding: var(--space-md) var(--space-sm);
  }

  .hero {
    padding: var(--space-lg);
  }

  .panel {
    padding: var(--space-lg);
  }

  .filter-panel, .filter-panel[data-expanded="true"] {
    position: relative;
    top: auto;
  }

  h1 {
    font-size: 2rem;
  }

  .detail-grid {
    padding: var(--space-md);
    gap: var(--space-md);
  }

  .detail-card {
    padding: var(--space-md);
  }

  .body-box {
    max-height: 60vh;
  }

  .mail-html-frame {
    min-height: 70vh;
  }

  .header-table td:first-child {
    width: 100px;
  }

  .filter-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .filter-field {
    min-width: 100%;
  }

  .filter-grid {
    grid-template-columns: 1fr;
  }

  .table-wrap {
    font-size: 0.75rem;
  }

  th, td {
    padding: var(--space-sm);
  }

}

/* === Print === */
@media print {
  .filter-panel,
  .pagination-bar,
  button,
  .nav-link {
    display: none !important;
  }

  .page-shell {
    background: white;
  }

  .panel {
    border: 1px solid #ccc;
    box-shadow: none;
  }
}