/* ==========================================================================
   QuMail Webmail & Admin Panel Stylesheet
   Modern, zero-dependency, dark/light responsive aesthetic
   ========================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;

  /* Color Palette - Dark Theme (Default) */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-hover: #2d3748;
  --border-color: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent-primary: #3b82f6;
  --accent-hover: #2563eb;
  --pqc-kem: #8b5cf6;
  --pqc-dsa: #06b6d4;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;

  --sidebar-width: 260px;
  --header-height: 60px;
  --radius: 8px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
}

body.theme-light {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-hover: #e2e8f0;
  --border-color: #e2e8f0;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
  font-size: 14px;
}

/* App Layout */
.app-layout {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* Header */
.app-header {
  height: var(--header-height);
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-icon {
  font-size: 1.5rem;
}

.brand-title {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: block;
}

.header-center {
  display: flex;
  align-items: center;
}

.pqc-status-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background-color: rgba(139, 92, 246, 0.15);
  border: 1px solid rgba(139, 92, 246, 0.3);
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  font-size: 0.8rem;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--pqc-kem);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--pqc-kem);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.pqc-label {
  font-weight: 600;
  color: var(--text-secondary);
}

.pqc-algo {
  color: var(--pqc-kem);
  font-family: var(--font-mono);
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-icon {
  background: none;
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
  padding: 0.4rem;
  border-radius: var(--radius);
  color: var(--text-primary);
}

.server-status {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.status-indicator.online {
  width: 8px;
  height: 8px;
  background-color: var(--success);
  border-radius: 50%;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.6rem;
  background-color: var(--bg-tertiary);
  border-radius: 9999px;
}

.user-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: var(--accent-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
}

.user-email {
  font-size: 0.8rem;
  font-weight: 500;
}

/* Body & Sidebar */
.app-body {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.app-sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  padding: 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.btn-compose {
  width: 100%;
  padding: 0.75rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.nav-section-title {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
  padding: 0.75rem 0.75rem 0.25rem;
  letter-spacing: 0.05em;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius);
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
  cursor: pointer;
  text-align: left;
  text-decoration: none;
  transition: all 0.15s ease;
}

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

.nav-item.active {
  background-color: rgba(59, 130, 246, 0.15);
  color: var(--accent-primary);
  font-weight: 600;
}

.counter {
  margin-left: auto;
  font-size: 0.75rem;
  background-color: var(--bg-tertiary);
  padding: 0.1rem 0.45rem;
  border-radius: 9999px;
  color: var(--text-secondary);
}

.badge-alert {
  background-color: rgba(239, 68, 68, 0.2);
  color: var(--danger);
  font-weight: 700;
}

.link-item .ext-icon {
  margin-left: auto;
  font-size: 0.8rem;
  opacity: 0.6;
}

/* Content View Switcher */
.app-content {
  flex: 1;
  background-color: var(--bg-primary);
  overflow: hidden;
  position: relative;
}

.content-view {
  display: none;
  height: 100%;
  width: 100%;
}

.content-view.active {
  display: flex;
}

/* Mailbox Split Pane */
#view-mail {
  display: none;
}
#view-mail.active {
  display: flex;
}

.message-list-pane {
  width: 380px;
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  background-color: var(--bg-primary);
}

.pane-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.pane-header h2 {
  font-size: 1.25rem;
  font-weight: 700;
}

.search-box input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 0.85rem;
  outline: none;
}

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

.message-item {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: background 0.15s ease;
}

.message-item:hover {
  background-color: var(--bg-secondary);
}

.message-item.selected {
  background-color: rgba(59, 130, 246, 0.1);
  border-left: 3px solid var(--accent-primary);
}

.msg-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.25rem;
}

.msg-from {
  font-weight: 600;
  font-size: 0.9rem;
}

.msg-date {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.msg-subject {
  font-size: 0.85rem;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.msg-preview {
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 0.4rem;
}

.msg-badges {
  display: flex;
  gap: 0.4rem;
}

/* Badges */
.badge {
  font-size: 0.7rem;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  font-weight: 600;
}

.badge-pqc-kem {
  background-color: rgba(139, 92, 246, 0.15);
  color: var(--pqc-kem);
  border: 1px solid rgba(139, 92, 246, 0.3);
}

.badge-pqc-dsa {
  background-color: rgba(6, 182, 212, 0.15);
  color: var(--pqc-dsa);
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.badge-success {
  background-color: rgba(16, 185, 129, 0.15);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-warning {
  background-color: rgba(245, 158, 11, 0.15);
  color: var(--warning);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.badge-standard {
  background-color: rgba(148, 163, 184, 0.15);
  color: #94a3b8;
  border: 1px solid rgba(148, 163, 184, 0.3);
}

/* Message Detail Pane */
.message-detail-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-secondary);
  overflow-y: auto;
}

.empty-detail-state {
  margin: auto;
  text-align: center;
  color: var(--text-muted);
}

.empty-detail-state .empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.detail-content {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.detail-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.5rem;
  margin-bottom: 1.5rem;
}

.detail-subject-line {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
}

.detail-subject-line h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.detail-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

.meta-label {
  color: var(--text-muted);
  margin-right: 0.25rem;
}

/* Dual View Tabs */
.view-tabs {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.view-tab {
  padding: 0.5rem 1rem;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
}

.view-tab.active {
  color: var(--accent-primary);
  border-bottom-color: var(--accent-primary);
}

.tab-pane {
  display: none;
  flex: 1;
}

.tab-pane.active {
  display: block;
}

.email-body-rendered {
  line-height: 1.6;
  white-space: pre-wrap;
  font-size: 0.95rem;
  color: var(--text-primary);
  padding: 1rem 0;
}

.a2a-inspector {
  padding: 1rem 0;
}

.a2a-badge-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tag {
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  background-color: var(--bg-tertiary);
  border-radius: 4px;
}

.tag-success {
  background-color: rgba(16, 185, 129, 0.2);
  color: var(--success);
}

.json-code {
  background-color: var(--bg-primary);
  padding: 1rem;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  color: #38bdf8;
}

.detail-actions {
  margin-top: auto;
  display: flex;
  gap: 0.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

/* Admin Dashboard & Pages */
.page-container {
  padding: 2.5rem;
  overflow-y: auto;
  width: 100%;
}

.page-header {
  margin-bottom: 2rem;
}

.page-header h2 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.page-header p {
  color: var(--text-muted);
  margin-top: 0.25rem;
}

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

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.metric-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.metric-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.metric-value {
  font-size: 1.5rem;
  font-weight: 700;
  font-family: var(--font-mono);
  margin-bottom: 0.25rem;
}

.metric-value.status-good {
  color: var(--success);
}

.metric-sub {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.dns-check-table {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1rem;
}

.dns-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1rem;
  background-color: var(--bg-primary);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
}

.dns-col-proto {
  font-weight: 700;
  font-family: var(--font-mono);
  width: 80px;
}

.dns-col-val {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* HITL Security */
.hitl-banner {
  background-color: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  display: flex;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 1.5rem;
}

.hitl-queue {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.hitl-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.hitl-card-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.hitl-desc {
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.hitl-actions {
  display: flex;
  gap: 0.5rem;
}

/* Tables */
.data-table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--bg-secondary);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.data-table th, .data-table td {
  padding: 0.85rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.data-table th {
  background-color: var(--bg-tertiary);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
}

.data-table td {
  font-size: 0.85rem;
}

/* Buttons */
.btn {
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.15s ease;
}

.btn-primary {
  background-color: var(--accent-primary);
  color: white;
}

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

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background-color: var(--bg-hover);
}

.btn-danger {
  background-color: rgba(239, 68, 68, 0.15);
  color: var(--danger);
}

.btn-danger:hover {
  background-color: var(--danger);
  color: white;
}

.btn-sm {
  padding: 0.35rem 0.7rem;
  font-size: 0.75rem;
}

/* Modals */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.7);
  z-index: 100;
  align-items: center;
  justify-content: center;
}

.modal.active {
  display: flex;
}

.modal-dialog {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  width: 100%;
  max-width: 600px;
  box-shadow: var(--shadow-lg);
}

.modal-header {
  padding: 1.25rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
}

.modal-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.modal-footer {
  padding: 1.25rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-group input, .form-group select, .form-group textarea {
  padding: 0.6rem 0.75rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9rem;
  outline: none;
}

.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: var(--accent-primary);
}

/* Authentication Modal & Styling */
.login-modal {
  backdrop-filter: blur(8px);
  background-color: rgba(15, 23, 42, 0.85);
  z-index: 1000;
}

.login-dialog {
  max-width: 440px;
  border: 1px solid rgba(59, 130, 246, 0.3);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7), 0 0 20px rgba(59, 130, 246, 0.15);
  animation: modalPop 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalPop {
  0% { transform: scale(0.95); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

.login-header {
  border-bottom: 1px solid var(--border-color);
  padding: 1.5rem;
}

.login-footer {
  border-top: 1px solid var(--border-color);
  padding: 1.25rem 1.5rem 1.5rem;
}

.login-error {
  background-color: rgba(239, 68, 68, 0.15);
  border: 1px solid var(--danger);
  color: #fca5a5;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  font-size: 0.85rem;
  line-height: 1.4;
}

.auth-security-notice {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.btn-block {
  width: 100%;
  justify-content: center;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
}

#btn-logout {
  font-size: 0.8rem;
  padding: 0.35rem 0.75rem;
  background-color: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

#btn-logout:hover {
  background-color: rgba(239, 68, 68, 0.15);
  border-color: var(--danger);
  color: #fca5a5;
}