:root {
  --bg: #f4f7fb;
  --surface: rgba(255, 255, 255, 0.92);
  --surface-strong: #ffffff;
  --border: rgba(17, 24, 39, 0.08);
  --shadow: 0 20px 45px rgba(15, 23, 42, 0.08);
  --shadow-soft: 0 10px 24px rgba(15, 23, 42, 0.05);
  --text: #162033;
  --muted: #5a6578;
  --primary: #0f5bd3;
  --primary-deep: #0b3f9e;
  --accent: #d97706;
  --success: #0f9f75;
  --danger: #d64545;
  --warning: #d9a300;
  --info: #1b76d1;
  --radius-lg: 26px;
  --radius-md: 18px;
}

html {
  font-size: 15px;
  min-height: 100%;
}

body.app-body {
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(15, 91, 211, 0.12), transparent 32%),
    radial-gradient(circle at right 10% top 20%, rgba(217, 119, 6, 0.12), transparent 24%),
    linear-gradient(180deg, #f8fbff 0%, var(--bg) 100%);
  font-family: "Segoe UI", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
}

.app-main {
  flex: 1;
  padding-bottom: 2rem;
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 1020;
  backdrop-filter: blur(14px);
  background: rgba(11, 20, 37, 0.82);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.app-header .navbar {
  padding: 1rem 0;
}

.app-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
  color: #fff;
  text-decoration: none;
}

.app-brand strong,
.app-brand small {
  display: block;
  color: #fff;
}

.app-brand small {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.72;
}

.app-brand__mark {
  width: 46px;
  height: 46px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-weight: 700;
  letter-spacing: 0.04em;
  background: linear-gradient(135deg, #6ea8fe 0%, #0f5bd3 65%, #0b3f9e 100%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.28);
}

.app-nav {
  align-items: center;
  gap: 0.45rem;
}

.app-nav .nav-link {
  color: rgba(255, 255, 255, 0.82);
  padding: 0.7rem 1rem;
  border-radius: 999px;
  font-weight: 600;
}

.app-nav .nav-link:hover,
.app-nav .nav-link.active {
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
}

.nav-link--cta {
  background: rgba(217, 119, 6, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.top-alert {
  border: 0;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
}

.app-footer {
  border-top: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.78);
}

.footer-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem 0;
}

.footer-shell p {
  color: var(--muted);
}

.page-section {
  margin-top: 1.8rem;
}

.surface-card,
.hero-panel {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 1.5rem;
}

.hero-panel {
  height: 100%;
}

.hero-panel--primary {
  color: #fff;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.1), transparent),
    linear-gradient(135deg, #0b3f9e 0%, #0f5bd3 55%, #2e84f5 100%);
}

.hero-panel--secondary {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(248, 250, 255, 0.95)),
    #fff;
}

.hero-panel--primary p,
.hero-panel--primary .hero-meta span {
  color: rgba(255, 255, 255, 0.86);
}

.hero-panel h1,
.hero-panel h2,
.surface-card h2 {
  margin: 0;
  font-size: clamp(1.65rem, 2vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.03em;
}

.surface-card h2 {
  font-size: 1.45rem;
}

.hero-panel p,
.section-subtitle,
.empty-state p,
.info-callout p,
.mail-preview {
  color: var(--muted);
}

.eyebrow {
  display: inline-block;
  margin-bottom: 0.85rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero-actions,
.toolbar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero-meta {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero-meta span {
  padding: 0.55rem 0.9rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  font-size: 0.92rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.stat-card,
.mail-stat {
  padding: 1rem 1.1rem;
  border-radius: 20px;
  background: var(--surface-strong);
  border: 1px solid rgba(17, 24, 39, 0.06);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.65);
}

.stat-card strong,
.mail-stat strong {
  display: block;
  margin-top: 0.55rem;
  font-size: 1.65rem;
  font-weight: 800;
}

.stat-card__label,
.mail-stat span,
.detail-grid span,
.info-list span {
  color: var(--muted);
  font-size: 0.92rem;
}

.section-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.4rem;
}

.activity-list,
.quick-links,
.attachment-list,
.info-list {
  display: grid;
  gap: 0.9rem;
}

.activity-item,
.quick-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.1rem;
  border-radius: 20px;
  text-decoration: none;
  color: inherit;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(17, 24, 39, 0.06);
}

.quick-link {
  flex-direction: column;
  align-items: flex-start;
}

.activity-item:hover,
.quick-link:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-soft);
}

.quick-link strong,
.activity-item__title {
  font-weight: 700;
}

.quick-link span,
.activity-item__meta,
.activity-item__side small {
  color: var(--muted);
}

.quick-link--active {
  background: rgba(15, 91, 211, 0.08);
  border-color: rgba(15, 91, 211, 0.22);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.42rem 0.8rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
}

.status-pill--success {
  color: #0d684e;
  background: rgba(15, 159, 117, 0.14);
}

.status-pill--warning {
  color: #8a6500;
  background: rgba(217, 163, 0, 0.15);
}

.status-pill--info {
  color: #0d4f91;
  background: rgba(27, 118, 209, 0.14);
}

.mail-layout {
  display: grid;
  grid-template-columns: minmax(250px, 300px) minmax(0, 1fr);
  gap: 1.5rem;
}

.mail-content {
  min-width: 0;
}

.mail-stats {
  display: grid;
  gap: 0.8rem;
}

.mail-table thead th {
  color: var(--muted);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-bottom-color: rgba(17, 24, 39, 0.08);
}

.mail-table tbody td {
  padding-top: 1rem;
  padding-bottom: 1rem;
  border-bottom-color: rgba(17, 24, 39, 0.05);
}

.mail-row--unread {
  background: rgba(15, 91, 211, 0.03);
}

.table-check {
  width: 48px;
}

.mail-person,
.mail-link {
  font-weight: 700;
}

.mail-link {
  color: var(--text);
  text-decoration: none;
}

.mail-link:hover {
  color: var(--primary);
}

.mail-preview {
  margin-top: 0.35rem;
  line-height: 1.55;
}

.mail-card-list,
.contact-card-list {
  display: grid;
  gap: 1rem;
}

.mail-card {
  padding: 1rem;
  border-radius: 22px;
  border: 1px solid rgba(17, 24, 39, 0.08);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-soft);
}

.mail-card--unread {
  border-color: rgba(15, 91, 211, 0.2);
  background: linear-gradient(180deg, rgba(15, 91, 211, 0.05), rgba(255, 255, 255, 0.95));
}

.mail-card__top,
.mail-card__bottom,
.attachment-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.mail-card__title {
  display: block;
  margin: 0.8rem 0 0.45rem;
}

.mobile-check-all {
  color: var(--muted);
}

.empty-state {
  padding: 3rem 1rem;
  text-align: center;
}

.empty-state h3,
.info-callout h3 {
  margin-bottom: 0.6rem;
  font-size: 1.15rem;
  font-weight: 800;
}

.info-callout {
  padding: 1.1rem 1.2rem;
  border-radius: 20px;
  background: rgba(15, 91, 211, 0.06);
  border: 1px solid rgba(15, 91, 211, 0.12);
}

.import-panel {
  padding: 1rem 1.1rem;
  border-radius: 20px;
  background: rgba(248, 250, 255, 0.95);
  border: 1px solid rgba(17, 24, 39, 0.07);
}

.import-form {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.import-form__controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: min(100%, 460px);
}

.compose-shell .surface-card {
  padding: 1.7rem;
}

.editor-tools {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.editor-tool-card {
  padding: 1rem;
  border-radius: 20px;
  background: rgba(248, 250, 255, 0.92);
  border: 1px solid rgba(17, 24, 39, 0.07);
}

.preview-list {
  display: grid;
  gap: 0.75rem;
}

.preview-item {
  display: grid;
  gap: 0.5rem;
  padding: 0.85rem;
  border-radius: 16px;
  border: 1px solid rgba(17, 24, 39, 0.07);
  background: rgba(255, 255, 255, 0.88);
}

.preview-item img {
  max-width: 100%;
  border-radius: 12px;
}

.preview-item--row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.preview-item--row span {
  display: grid;
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.detail-grid strong,
.info-list strong {
  display: block;
  margin-top: 0.35rem;
  font-weight: 700;
  word-break: break-word;
}

.email-body {
  min-height: 220px;
  padding: 1.4rem;
  border-radius: 24px;
  background: rgba(248, 250, 255, 0.95);
  border: 1px solid rgba(17, 24, 39, 0.06);
  overflow-x: auto;
  line-height: 1.7;
}

.email-body img,
.email-body table {
  max-width: 100%;
}

.btn {
  border-radius: 999px;
  font-weight: 700;
  padding: 0.72rem 1.15rem;
}

.btn-sm {
  padding: 0.45rem 0.85rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-deep) 100%);
  border-color: transparent;
}

.btn-outline-primary {
  color: var(--primary);
  border-color: rgba(15, 91, 211, 0.26);
}

.btn-outline-danger {
  color: var(--danger);
  border-color: rgba(214, 69, 69, 0.28);
}

.btn-outline-secondary {
  border-color: rgba(90, 101, 120, 0.22);
}

.form-control,
.form-select {
  min-height: 3rem;
  border-radius: 16px;
  border-color: rgba(17, 24, 39, 0.12);
}

.form-control:focus,
.form-select:focus,
.form-check-input:focus,
.btn:focus,
.btn:active:focus {
  box-shadow: 0 0 0 0.18rem rgba(15, 91, 211, 0.16);
  border-color: rgba(15, 91, 211, 0.4);
}

.pagination .page-link {
  border-radius: 999px;
  margin: 0 0.2rem;
  border: 0;
  color: var(--text);
  box-shadow: var(--shadow-soft);
}

.pagination .page-item.active .page-link {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-deep) 100%);
}

@media (max-width: 991.98px) {
  .mail-layout {
    grid-template-columns: 1fr;
  }

  .mail-sidebar {
    order: 2;
  }

  .mail-content {
    order: 1;
  }

  .editor-tools,
  .detail-grid,
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .import-form,
  .import-form__controls {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (max-width: 767.98px) {
  .app-header .navbar {
    padding: 0.9rem 0;
  }

  .app-nav {
    margin-top: 0.8rem;
  }

  .footer-shell,
  .section-heading--stack-mobile,
  .activity-item,
  .mail-card__bottom,
  .attachment-item {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn,
  .toolbar-actions .btn {
    width: 100%;
  }

  .hero-panel,
  .surface-card {
    padding: 1.2rem;
    border-radius: 22px;
  }

  .hero-panel h1 {
    font-size: 2rem;
  }

  .mail-card__top {
    align-items: flex-start;
  }
}