/* ===== MHMail — Notion-Inspired Design System ===== */
/* Based on Design.md — Warm Neutrals, Inter, Whisper Borders */

/* === CSS Custom Properties (Design Tokens) === */
:root {
  /* Primary colors */
  --color-text-primary: rgba(0, 0, 0, 0.95);
  --color-bg-primary: #ffffff;
  --color-accent: #0075de;

  /* Warm neutral scale */
  --color-warm-white: #f6f5f4;
  --color-warm-dark: #31302e;
  --color-warm-gray-500: #615d59;
  --color-warm-gray-300: #a39e98;

  /* Interactive */
  --color-link: #0075de;
  --color-link-hover: #005bab;
  --color-focus: #097fe8;
  --color-badge-bg: #f2f9ff;
  --color-badge-text: #097fe8;

  /* Semantic */
  --color-success: #1aae39;
  --color-warning: #dd5b00;
  --color-error: #c0392b;

  /* Borders & Shadows */
  --border-whisper: 1px solid rgba(0, 0, 0, 0.1);
  --radius-micro: 4px;
  --radius-subtle: 5px;
  --radius-standard: 8px;
  --radius-comfortable: 12px;
  --radius-pill: 9999px;

  --shadow-card: rgba(0, 0, 0, 0.04) 0px 4px 18px,
                 rgba(0, 0, 0, 0.027) 0px 2.025px 7.84688px,
                 rgba(0, 0, 0, 0.02) 0px 0.8px 2.925px,
                 rgba(0, 0, 0, 0.01) 0px 0.175px 1.04062px;

  --shadow-focus: 0 0 0 2px var(--color-focus);

  /* Typography */
  --font-primary: 'Inter', -apple-system, system-ui, 'Segoe UI', Helvetica, Arial, sans-serif;
  --font-size-micro: 12px;
  --font-size-caption: 14px;
  --font-size-body: 16px;
  --font-size-button: 15px;
  --font-size-card-title: 22px;
  --font-size-heading: 26px;
  --font-size-display: 40px;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.23;
  --line-height-body: 1.5;

  /* Spacing (8px base) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-8: 48px;
  --space-10: 64px;

  /* Layout */
  --max-width: 1200px;
  --auth-card-width: 400px;
}

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

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

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-body);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
}

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--color-link-hover);
  text-decoration: underline;
}

/* === Auth Layout === */
.auth-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
  background-color: var(--color-warm-white);
}

.auth-card {
  width: 100%;
  max-width: var(--auth-card-width);
  background: var(--color-bg-primary);
  border: var(--border-whisper);
  border-radius: var(--radius-comfortable);
  box-shadow: var(--shadow-card);
  padding: var(--space-6);
}

.auth-card h1 {
  font-size: var(--font-size-heading);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  letter-spacing: -0.625px;
  color: var(--color-text-primary);
  margin-bottom: var(--space-5);
  text-align: center;
}

/* === Form Elements === */
.form-group {
  margin-bottom: var(--space-4);
}

.form-group label {
  display: block;
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"] {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-primary);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-normal);
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  border: 1px solid #dddddd;
  border-radius: var(--radius-micro);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-group input::placeholder {
  color: var(--color-warm-gray-300);
}

.form-group input:focus {
  border-color: var(--color-focus);
  box-shadow: 0 0 0 2px rgba(9, 127, 232, 0.2);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-primary);
  font-size: var(--font-size-button);
  font-weight: var(--font-weight-semibold);
  line-height: 1.33;
  border-radius: var(--radius-micro);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.1s ease;
  text-decoration: none;
}

.btn:active {
  transform: scale(0.9);
}

.btn:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

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

.btn-primary:hover {
  background-color: var(--color-link-hover);
  text-decoration: none;
}

.btn-secondary {
  background-color: rgba(0, 0, 0, 0.05);
  color: var(--color-text-primary);
}

.btn-secondary:hover {
  background-color: rgba(0, 0, 0, 0.08);
  text-decoration: none;
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-primary);
}

.btn-ghost:hover {
  text-decoration: underline;
}

.btn-block {
  width: 100%;
}

/* === Flash Messages === */
.flash-message {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-standard);
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-4);
  border: var(--border-whisper);
}

.flash-error {
  background-color: #fef2f2;
  color: var(--color-error);
  border-color: rgba(192, 57, 43, 0.2);
}

.flash-success {
  background-color: #f0fdf4;
  color: var(--color-success);
  border-color: rgba(26, 174, 57, 0.2);
}

.flash-info {
  background-color: var(--color-badge-bg);
  color: var(--color-badge-text);
  border-color: rgba(9, 127, 232, 0.2);
}

/* === Auth Links === */
.auth-links {
  margin-top: var(--space-5);
  text-align: center;
  font-size: var(--font-size-caption);
  color: var(--color-warm-gray-500);
}

.auth-links a {
  font-weight: var(--font-weight-semibold);
}

/* === Navigation === */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-5);
  background: var(--color-bg-primary);
  border-bottom: var(--border-whisper);
  max-width: var(--max-width);
  margin: 0 auto;
}

.nav-brand {
  font-size: var(--font-size-card-title);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.25px;
  color: var(--color-text-primary);
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav-link {
  font-size: var(--font-size-button);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  text-decoration: none;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-micro);
  transition: color 0.15s ease;
}

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

.nav-user {
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-medium);
  color: var(--color-warm-gray-500);
  padding: var(--space-1) var(--space-2);
}

.nav-user .role-badge {
  display: inline-block;
  padding: 2px 8px;
  font-size: var(--font-size-micro);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.125px;
  background: var(--color-badge-bg);
  color: var(--color-badge-text);
  border-radius: var(--radius-pill);
  margin-left: var(--space-1);
}

/* === Dashboard === */
.dashboard {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-10) var(--space-5);
}

.dashboard h1 {
  font-size: var(--font-size-display);
  font-weight: var(--font-weight-bold);
  line-height: 1.04;
  letter-spacing: -1.5px;
  margin-bottom: var(--space-4);
}

.dashboard p {
  font-size: var(--font-size-body);
  color: var(--color-warm-gray-500);
  margin-bottom: var(--space-5);
}

/* === Utility === */
.text-center { text-align: center; }
.is-hidden { display: none; }
.is-active { display: block; }
.text-muted { color: var(--color-warm-gray-500); }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }

/* === Inbox === */
.inbox-page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-4) var(--space-5);
}

.inbox-container {
  border: var(--border-whisper);
  border-radius: var(--radius-standard);
  overflow: hidden;
}

/* Toolbar */
.inbox-toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-warm-white);
  border-bottom: var(--border-whisper);
}

.inbox-count {
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-semibold);
  color: var(--color-warm-gray-500);
  margin-right: auto;
}

.inbox-spinner {
  font-size: var(--font-size-caption);
  color: var(--color-accent);
}

.btn-sm {
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-caption);
}

.inbox-refresh-icon {
  display: inline-block;
  font-size: 16px;
  line-height: 1;
}

/* Error banners */
.inbox-errors {
  padding: var(--space-3) var(--space-4);
  background: #fef2f2;
  border-bottom: var(--border-whisper);
}

.inbox-error-banner {
  font-size: var(--font-size-caption);
  color: var(--color-error);
  padding: var(--space-1) 0;
}

.inbox-error-banner strong {
  font-weight: var(--font-weight-semibold);
}

/* List */
.inbox-list {
  background: var(--color-bg-primary);
}

/* Row */
.inbox-row {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-bottom: var(--border-whisper);
  cursor: pointer;
  transition: background-color 0.1s ease;
}

.inbox-row:last-child {
  border-bottom: none;
}

.inbox-row:hover {
  background-color: var(--color-warm-white);
}

.inbox-row-unread {
  background-color: var(--color-badge-bg);
}

.inbox-row-unread .inbox-row-sender,
.inbox-row-unread .inbox-row-subject {
  font-weight: var(--font-weight-semibold);
}

/* Account badge */
.inbox-row-left {
  flex-shrink: 0;
  padding-top: 2px;
}

.inbox-account-badge {
  display: inline-block;
  padding: 2px 8px;
  font-size: var(--font-size-micro);
  font-weight: var(--font-weight-semibold);
  color: #ffffff;
  border-radius: var(--radius-pill);
  white-space: nowrap;
  max-width: 100px;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Row body */
.inbox-row-body {
  flex: 1;
  min-width: 0;
}

.inbox-row-header {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  margin-bottom: 2px;
}

.inbox-row-sender {
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.inbox-row-date {
  font-size: var(--font-size-micro);
  color: var(--color-warm-gray-500);
  white-space: nowrap;
  margin-left: auto;
  flex-shrink: 0;
}

.inbox-row-subject {
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-normal);
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 1px;
}

.inbox-row-preview {
  font-size: var(--font-size-micro);
  color: var(--color-warm-gray-500);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Attachment icon */
.inbox-attachment-icon {
  flex-shrink: 0;
  font-size: 14px;
  line-height: 1;
  padding-top: 4px;
  opacity: 0.5;
}

/* Empty states */
.inbox-empty {
  padding: var(--space-10) var(--space-5);
  text-align: center;
}

.inbox-empty h2 {
  font-size: var(--font-size-card-title);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.inbox-empty p {
  font-size: var(--font-size-body);
  color: var(--color-warm-gray-500);
  margin-bottom: var(--space-5);
}

/* Dashboard actions */
.dashboard-actions {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

/* Active nav link */
.nav-link.active {
  color: var(--color-accent);
  position: relative;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: var(--space-2);
  right: var(--space-2);
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
}

/* === 3-Pane App Shell === */
.app-shell {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  background-color: var(--color-bg-primary);
}

/* Top bar */
.top-bar {
  flex-shrink: 0;
  border-bottom: var(--border-whisper);
  background: var(--color-bg-primary);
}

.app-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-4);
  max-width: none;
  margin: 0;
}

.app-nav-brand {
  font-size: var(--font-size-card-title);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.25px;
  color: var(--color-text-primary);
  text-decoration: none;
}

.app-nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.app-nav-link {
  font-size: var(--font-size-button);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  text-decoration: none;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-micro);
  transition: color 0.15s ease;
}

.app-nav-link:hover {
  color: var(--color-link);
  text-decoration: none;
}

.app-nav-user {
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-medium);
  color: var(--color-warm-gray-500);
  padding: var(--space-1) var(--space-2);
}

.app-nav-user .role-badge {
  display: inline-block;
  padding: 2px 8px;
  font-size: var(--font-size-micro);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.125px;
  background: var(--color-badge-bg);
  color: var(--color-badge-text);
  border-radius: var(--radius-pill);
  margin-left: var(--space-1);
}

/* Pane container */
.pane-container {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: 240px;
  flex-shrink: 0;
  background: var(--color-warm-white);
  border-right: var(--border-whisper);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.sidebar-inner {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: var(--space-3) 0;
}

.sidebar-section {
  padding: 0 var(--space-2);
  margin-bottom: var(--space-3);
}

.sidebar-section-title {
  font-size: var(--font-size-micro);
  font-weight: var(--font-weight-semibold);
  color: var(--color-warm-gray-500);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: var(--space-2) var(--space-2);
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-2);
  border-radius: var(--radius-micro);
  cursor: pointer;
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  transition: background-color 0.1s ease;
  text-decoration: none;
}

.sidebar-item:hover {
  background-color: rgba(0, 0, 0, 0.05);
  text-decoration: none;
}

.sidebar-item.active {
  background-color: rgba(0, 117, 222, 0.1);
  color: var(--color-accent);
  font-weight: var(--font-weight-semibold);
}

.sidebar-item-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-color-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  flex-shrink: 0;
}

.sidebar-item-icon {
  font-size: 14px;
  line-height: 1;
  flex-shrink: 0;
}

.sidebar-folder-stub {
  font-size: var(--font-size-micro);
  color: var(--color-warm-gray-500);
  flex-shrink: 0;
}

.sidebar-item-add {
  color: var(--color-link);
  font-weight: var(--font-weight-semibold);
}

.sidebar-item-add:hover {
  background-color: rgba(0, 117, 222, 0.08);
}

.sidebar-empty {
  padding: var(--space-4) var(--space-2);
  text-align: center;
  color: var(--color-warm-gray-500);
  font-size: var(--font-size-caption);
}

.sidebar-empty p {
  margin-bottom: var(--space-3);
}

.sidebar-bottom {
  margin-top: auto;
  padding: var(--space-3) var(--space-2);
  border-top: var(--border-whisper);
}

.sidebar-logout {
  font-size: var(--font-size-caption);
  color: var(--color-warm-gray-500);
  padding: var(--space-1) var(--space-2);
}

/* Center pane */
.center-pane {
  flex: 1;
  min-width: 0;
  overflow-y: auto;
}

/* Right pane / preview pane */
.right-pane {
  width: 400px;
  flex-shrink: 0;
  border-left: var(--border-whisper);
  overflow-y: auto;
  background: var(--color-bg-primary);
}

/* Preview pane empty state */
.preview-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--color-warm-gray-500);
  padding: var(--space-5);
  text-align: center;
}

.preview-empty-icon {
  font-size: 48px;
  margin-bottom: var(--space-4);
  opacity: 0.4;
}

.preview-empty p {
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-medium);
}

.back-to-list {
  display: none;
}

/* Mobile hamburger toggle */
.sidebar-toggle {
  display: none;
  position: fixed;
  top: var(--space-2);
  left: var(--space-2);
  z-index: 100;
  background: var(--color-bg-primary);
  border: var(--border-whisper);
  border-radius: var(--radius-micro);
  padding: var(--space-2) var(--space-3);
  font-size: 18px;
  cursor: pointer;
  line-height: 1;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 50;
}

/* Responsive: 1024px */
@media (max-width: 1024px) {
  .sidebar {
    width: 200px;
  }
  .right-pane {
    width: 320px;
  }
}

/* Responsive: 768px */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 280px;
    z-index: 75;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    box-shadow: 2px 0 12px rgba(0,0,0,0.1);
  }

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

  .sidebar-overlay.is-visible {
    display: block;
  }

  .sidebar-toggle {
    display: block;
  }

  .center-pane {
    margin-left: 0;
  }

  .right-pane {
    width: 320px;
  }
}

/* Responsive: 480px */
@media (max-width: 480px) {
  .back-to-list {
    display: block;
    position: absolute;
    top: var(--space-2);
    left: var(--space-2);
    z-index: 10;
    background: var(--color-warm-white);
    border: var(--border-whisper);
    border-radius: var(--radius-micro);
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-caption);
    cursor: pointer;
  }

  .right-pane {
    position: relative;
    display: none;
    width: 100%;
    border-left: none;
  }

  .pane-container.preview-open .right-pane {
    display: block;
  }

  .pane-container.preview-open .center-pane {
    display: none;
  }

  .sidebar-toggle {
    top: var(--space-1);
    left: var(--space-1);
  }
}

/* === Message Viewer === */
.message-view {
  padding: var(--space-5);
  background: var(--color-bg-primary);
}

/* Header */
.message-header {
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-4);
  border-bottom: var(--border-whisper);
}

.message-subject {
  font-size: var(--font-size-card-title);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  letter-spacing: -0.3px;
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
}

.message-meta {
  width: 100%;
  border-collapse: collapse;
}

.message-meta tr {
  vertical-align: top;
}

.message-meta-label {
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-semibold);
  color: var(--color-warm-gray-500);
  white-space: nowrap;
  padding: 2px var(--space-3) 2px 0;
  text-align: left;
  width: 56px;
}

.message-meta-value {
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-normal);
  color: var(--color-text-primary);
  padding: 2px 0;
  word-break: break-word;
}

/* Actions */
.message-actions {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-4);
  border-bottom: var(--border-whisper);
}

/* HTML body */
.message-body-html {
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  color: var(--color-text-primary);
  margin-bottom: var(--space-5);
  overflow-wrap: break-word;
}

.message-body-html a {
  color: var(--color-link);
  text-decoration: underline;
}

.message-body-html a:hover {
  color: var(--color-link-hover);
}

.message-body-html img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-micro);
}

.message-body-html blockquote {
  margin: var(--space-3) 0;
  padding: var(--space-2) var(--space-4);
  border-left: 3px solid var(--color-warm-gray-300);
  color: var(--color-warm-gray-500);
}

.message-body-html pre,
.message-body-html code {
  font-family: 'SF Mono', 'Fira Code', 'Courier New', monospace;
  font-size: var(--font-size-caption);
  background: var(--color-warm-white);
  border-radius: var(--radius-micro);
}

.message-body-html code {
  padding: 1px 4px;
}

.message-body-html pre {
  padding: var(--space-3);
  overflow-x: auto;
}

.message-body-html pre code {
  padding: 0;
  background: none;
}

.message-body-html table {
  border-collapse: collapse;
  width: 100%;
  margin: var(--space-3) 0;
}

.message-body-html th,
.message-body-html td {
  border: 1px solid rgba(0, 0, 0, 0.1);
  padding: var(--space-2) var(--space-3);
  text-align: left;
}

.message-body-html th {
  font-weight: var(--font-weight-semibold);
  background: var(--color-warm-white);
}

.message-body-html hr {
  border: none;
  border-top: var(--border-whisper);
  margin: var(--space-4) 0;
}

.message-body-html ul,
.message-body-html ol {
  margin: var(--space-2) 0;
  padding-left: var(--space-5);
}

.message-body-html li {
  margin-bottom: var(--space-1);
}

.message-body-html h1,
.message-body-html h2,
.message-body-html h3,
.message-body-html h4,
.message-body-html h5,
.message-body-html h6 {
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  margin: var(--space-4) 0 var(--space-2);
}

.message-body-html h1 { font-size: 24px; }
.message-body-html h2 { font-size: 20px; }
.message-body-html h3 { font-size: 18px; }
.message-body-html h4 { font-size: 16px; }
.message-body-html h5 { font-size: 14px; }
.message-body-html h6 { font-size: 13px; }

/* Plain text body */
.message-body-text {
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  color: var(--color-text-primary);
  white-space: pre-wrap;
  word-wrap: break-word;
  margin-bottom: var(--space-5);
  font-family: 'SF Mono', 'Fira Code', 'Courier New', monospace;
}

/* Attachments */
.message-attachments {
  padding-top: var(--space-4);
  border-top: var(--border-whisper);
}

.message-attachments-title {
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-semibold);
  color: var(--color-warm-gray-500);
  margin-bottom: var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.message-attachments-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.message-attachment-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-micro);
  transition: background-color 0.1s ease;
}

.message-attachment-item:hover {
  background-color: var(--color-warm-white);
}

.attachment-icon {
  font-size: 14px;
  line-height: 1;
  flex-shrink: 0;
}

.attachment-filename {
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  word-break: break-all;
}

.attachment-meta {
  font-size: var(--font-size-micro);
  color: var(--color-warm-gray-500);
  margin-left: auto;
  flex-shrink: 0;
}

/* Loading state */
.message-loading { display: none; }
.message-loading.htmx-request { display: flex; flex-direction: column; align-items: center; justify-content: center; padding: var(--space-10) var(--space-5); color: var(--color-warm-gray-500); }
.message-loading-spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--color-warm-white);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: message-spin 0.8s linear infinite;
  margin-bottom: var(--space-3);
}

@keyframes message-spin {
  to { transform: rotate(360deg); }
}

.message-loading p {
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-medium);
}

/* Error state */
.message-error {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-10) var(--space-5);
  text-align: center;
}

.message-error-icon {
  font-size: 36px;
  margin-bottom: var(--space-3);
  opacity: 0.5;
}

.message-error h3 {
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.message-error p {
  font-size: var(--font-size-caption);
  color: var(--color-warm-gray-500);
  margin-bottom: var(--space-4);
}

/* === Compose Page === */
.compose-page {
  max-width: 680px;
  margin: 0 auto;
  padding: var(--space-5);
}

.compose-card {
  background: var(--color-bg-primary);
  border: var(--border-whisper);
  border-radius: var(--radius-comfortable);
  box-shadow: var(--shadow-card);
  padding: var(--space-5);
}

.compose-field {
  margin-bottom: var(--space-4);
}

.compose-field label {
  display: block;
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-semibold);
  color: var(--color-warm-gray-500);
  margin-bottom: var(--space-1);
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.compose-required {
  color: var(--color-error);
}

.compose-input,
.compose-select {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-primary);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-normal);
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  border: 1px solid #dddddd;
  border-radius: var(--radius-micro);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.compose-select {
  appearance: auto;
  cursor: pointer;
}

.compose-input::placeholder,
.compose-body::placeholder {
  color: var(--color-warm-gray-300);
}

.compose-input:focus,
.compose-select:focus,
.compose-body:focus {
  border-color: var(--color-focus);
  box-shadow: 0 0 0 2px rgba(9, 127, 232, 0.2);
}

.compose-body {
  width: 100%;
  min-height: 300px;
  padding: var(--space-3);
  font-family: 'SF Mono', 'Fira Code', 'Courier New', monospace;
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  border: 1px solid #dddddd;
  border-radius: var(--radius-micro);
  outline: none;
  resize: vertical;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.compose-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding-top: var(--space-4);
  border-top: var(--border-whisper);
}

/* === Folder Tree (Sidebar) === */
.sidebar-account {
  margin-bottom: var(--space-1);
}

.sidebar-folder-control {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2) var(--space-1) calc(var(--space-2) + 4px + var(--space-2));
  font-size: var(--font-size-micro);
  font-weight: var(--font-weight-medium);
  color: var(--color-warm-gray-500);
  cursor: pointer;
  border-radius: var(--radius-micro);
  transition: background-color 0.1s ease, color 0.1s ease;
  user-select: none;
}

.sidebar-folder-control:hover {
  background-color: rgba(0, 0, 0, 0.04);
  color: var(--color-text-primary);
}

.sidebar-folder-tree-container {
  overflow: hidden;
}

.sidebar-folder-tree {
  padding: 0;
}

.sidebar-folder-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px var(--space-2);
  min-height: 24px;
  border-radius: var(--radius-micro);
  transition: background-color 0.1s ease;
}

.sidebar-folder-item:hover {
  background-color: rgba(0, 0, 0, 0.04);
}

.sidebar-folder-icon {
  font-size: 12px;
  line-height: 1;
  flex-shrink: 0;
  width: 16px;
  text-align: center;
}

.sidebar-folder-label {
  font-size: var(--font-size-micro);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  cursor: pointer;
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding: 2px 4px;
  border-radius: var(--radius-micro);
  transition: background-color 0.1s ease;
}

.sidebar-folder-label:hover {
  background-color: rgba(0, 0, 0, 0.03);
}

.sidebar-folder-label.active {
  background-color: rgba(0, 117, 222, 0.1);
  color: var(--color-accent);
  font-weight: var(--font-weight-semibold);
}


/* === Move Dropdown === */
.move-dropdown {
  padding: 2px 6px;
  font-family: var(--font-primary);
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-normal);
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  border: 1px solid #dddddd;
  border-radius: var(--radius-micro);
  outline: none;
  cursor: pointer;
  max-width: 180px;
}

.move-dropdown:focus {
  border-color: var(--color-focus);
  box-shadow: 0 0 0 2px rgba(9, 127, 232, 0.2);
}

/* Folder error state */
.folder-error {
  font-size: var(--font-size-micro);
  color: var(--color-error);
  padding: var(--space-1) var(--space-2);
}

/* Ensure responsive sidebar folder tree works at all breakpoints */
@media (max-width: 1024px) {
  .sidebar-folder-control {
    padding-left: calc(var(--space-2) + 4px + var(--space-2));
  }
}

@media (max-width: 768px) {
  .sidebar-folder-control {
    padding-left: calc(var(--space-2) + 4px + var(--space-2));
  }
}

@media (max-width: 480px) {
  .sidebar-folder-control {
    padding-left: calc(var(--space-2) + 4px + var(--space-2));
  }
}

/* Folder children indentation — each nesting level adds 16px left padding */
.sidebar-folder-children {
  padding-left: 16px;
}

/* === Search Bar === */
.search-bar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-primary);
  border-bottom: var(--border-whisper);
}

.search-bar-input {
  flex: 1;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-primary);
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-normal);
  color: var(--color-text-primary);
  background: var(--color-warm-white);
  border: var(--border-whisper);
  border-radius: var(--radius-micro);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.search-bar-input::placeholder {
  color: var(--color-warm-gray-300);
}

.search-bar-input:focus {
  border-color: var(--color-focus);
  box-shadow: 0 0 0 2px rgba(9, 127, 232, 0.2);
  background: var(--color-bg-primary);
}

/* Search clear button */
.search-clear-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  font-size: 14px;
  line-height: 1;
  color: var(--color-warm-gray-500);
  background: transparent;
  border: var(--border-whisper);
  border-radius: var(--radius-micro);
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.15s ease, color 0.15s ease;
  flex-shrink: 0;
}

.search-clear-button:hover {
  background: rgba(0, 0, 0, 0.05);
  color: var(--color-text-primary);
  text-decoration: none;
}

/* Search results header */
.search-results-header {
  padding: var(--space-3) var(--space-4);
  background: var(--color-warm-white);
  border-bottom: var(--border-whisper);
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-normal);
  color: var(--color-warm-gray-500);
}

.search-results-header strong {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

/* Search HTMX spinner */
.search-spinner {
  font-size: var(--font-size-caption);
  color: var(--color-accent);
}

/* Responsive */
@media (max-width: 480px) {
  .search-bar {
    padding: var(--space-2) var(--space-3);
    flex-wrap: wrap;
  }

  .search-bar-input {
    font-size: var(--font-size-micro);
    padding: var(--space-1) var(--space-2);
  }

  .search-results-header {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-micro);
  }

  .search-clear-button {
    width: 24px;
    height: 24px;
    font-size: 12px;
  }
}

/* === Attachment Download Links === */
.attachment-download {
  color: var(--color-link);
  text-decoration: none;
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-medium);
  transition: color 0.15s ease;
}

.attachment-download:hover {
  color: var(--color-link-hover);
  text-decoration: underline;
}

/* === Compose Upload Zone === */
.compose-field-attachments {
  margin-bottom: var(--space-4);
}

.compose-field-attachments label {
  display: block;
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-semibold);
  color: var(--color-warm-gray-500);
  margin-bottom: var(--space-1);
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.compose-upload-zone {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
  border: 2px dashed var(--color-warm-gray-300);
  border-radius: var(--radius-standard);
  background: var(--color-warm-white);
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
  margin-bottom: var(--space-3);
}

.compose-upload-zone:hover {
  border-color: var(--color-link);
  background-color: var(--color-badge-bg);
}

.compose-file-input {
  position: absolute;
  width: 0;
  height: 0;
  opacity: 0;
  overflow: hidden;
  pointer-events: none;
}

.compose-upload-label {
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-medium);
  color: var(--color-warm-gray-500);
  cursor: pointer;
  text-align: center;
}

/* === Attachment Pills === */
.compose-attachment-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.attachment-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  background: var(--color-warm-white);
  border: var(--border-whisper);
  border-radius: var(--radius-pill);
  font-size: var(--font-size-caption);
  line-height: 1.4;
  transition: background-color 0.1s ease;
}

.attachment-pill:hover {
  background-color: #eae8e6;
}

.attachment-pill-icon {
  font-size: 12px;
  line-height: 1;
  flex-shrink: 0;
}

.attachment-pill-name {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  max-width: 180px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.attachment-pill-size {
  font-size: var(--font-size-micro);
  color: var(--color-warm-gray-500);
  flex-shrink: 0;
}

.attachment-pill-remove {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  padding: 0;
  font-size: 14px;
  line-height: 1;
  color: var(--color-warm-gray-500);
  background: transparent;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: background-color 0.1s ease, color 0.1s ease;
  flex-shrink: 0;
}

.attachment-pill-remove:hover {
  background-color: rgba(0, 0, 0, 0.08);
  color: var(--color-error);
}

/* Upload error flash inside attachment zone */
.compose-field-attachments .flash-message {
  margin-bottom: var(--space-3);
}