/* === Phase U1: Design Tokens + CSS Variables === */

:root {
  /* ── Brand (구조색: CTA·링크·포커스에만) ───────────────── */
  --color-primary:        #0075de;
  --color-primary-active: #005bab;
  --color-on-primary:     #ffffff;
  --color-secondary:      #213183;

  /* ── Surface ───────────────────────────────────────────── */
  --color-canvas:   #f6f5f4;
  --color-surface:  #ffffff;
  --color-hairline: #e6e6e6;

  /* ── Ink ───────────────────────────────────────────────── */
  --color-ink:           #000000;
  --color-ink-secondary: #31302e;
  --color-ink-muted:     #615d59;
  --color-ink-faint:     #a39e98;

  /* ── Semantic ──────────────────────────────────────────── */
  --color-danger:        #dd5b00;
  --color-danger-strong: #793400;
  --color-success:       #1aae39;
  --color-success-strong:#2e7d32;
  --color-info:          var(--color-primary);

  /* ── Radius ────────────────────────────────────────────── */
  --radius-xs:   4px;
  --radius-sm:   5px;
  --radius-md:   8px;
  --radius-lg:  12px;
  --radius-xl:  16px;
  --radius-full: 9999px;

  /* ── Spacing (base 8px) ────────────────────────────────── */
  --space-xxs:  4px;
  --space-xs:   8px;
  --space-sm:  12px;
  --space-md:  16px;
  --space-lg:  24px;
  --space-xl:  28px;
  --space-xxl: 32px;

  /* ── Typography ────────────────────────────────────────── */
  --font-sans: 'Inter', 'Pretendard', -apple-system, BlinkMacSystemFont,
               'Apple SD Gothic Neo', 'Malgun Gothic', 'Segoe UI', sans-serif;
  --type-h1:      40px 700 1.1;
  --type-h2:      26px 700 1.23;
  --type-h3:      22px 700 1.27;
  --type-title:   20px 600 1.4;
  --type-body:    16px 400 1.5;
  --type-body-sm: 15px 400 1.33;
  --type-button:  16px 500 1.5;
  --type-caption: 14px 400 1.43;
  --type-eyebrow: 12px 600 1.33;

  /* ── Elevation (겹겹의 미세 그림자) ──────────────────── */
  --shadow-0: none;
  --shadow-1: 0 0.175px 1.041px rgba(0,0,0,.01),
              0 0.8px   2.925px rgba(0,0,0,.02),
              0 2.025px 7.847px rgba(0,0,0,.027),
              0 4px     18px    rgba(0,0,0,.04);
  --shadow-2: 0 0.175px 1.041px rgba(0,0,0,.01),
              0 0.8px   2.925px rgba(0,0,0,.02),
              0 2.025px 7.847px rgba(0,0,0,.027),
              0 4px     18px    rgba(0,0,0,.04),
              0 23px 52px rgba(0,0,0,.05);

  /* ── Flash message backgrounds (semantic + low alpha) ──── */
  --flash-error-bg:   rgba(221, 91, 0, 0.1);
  --flash-success-bg: rgba(26, 174, 57, 0.1);
  --flash-info-bg:    rgba(0, 117, 222, 0.1);
}

/* ── Dark Mode (OS preference) ─────────────────────────────── */
@media (prefers-color-scheme: dark) {
  :root {
    --color-canvas:   #1a1918;
    --color-surface:  #2a2928;
    --color-hairline: #444342;

    --color-ink:           #e8e8e7;
    --color-ink-secondary: #c5c1be;
    --color-ink-muted:     #a39e98;
    --color-ink-faint:     #8a8682;

    --color-primary:       #4a9eff;
    --color-primary-active:#2a7dd9;
    --color-danger-strong: #ff8c42;

    /* Shadow adaptation for dark mode */
    --shadow-1: 0 0.175px 1.041px rgba(0,0,0,.1),
                0 0.8px   2.925px rgba(0,0,0,.15),
                0 2.025px 7.847px rgba(0,0,0,.2),
                0 4px     18px    rgba(0,0,0,.25);
    --shadow-2: 0 0.175px 1.041px rgba(0,0,0,.1),
                0 0.8px   2.925px rgba(0,0,0,.15),
                0 2.025px 7.847px rgba(0,0,0,.2),
                0 4px     18px    rgba(0,0,0,.25),
                0 23px 52px rgba(0,0,0,.3);
  }
}

/* === Global Styles === */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--color-canvas);
  margin: 0;
  color: var(--color-ink);
  line-height: 1.6;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus { outline: 2px solid var(--color-primary); outline-offset: 2px; }

button:focus, input:focus, textarea:focus, select:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* === Header & Navigation === */
header {
  background: var(--color-surface);
  padding: 12px 20px;
  box-shadow: var(--shadow-1);
  position: sticky;
  top: 0;
  z-index: 1000;
}

header span { font-weight: bold; }
header nav a { margin-left: 16px; }
header .header-container { max-width: 1200px; margin: 0 auto; }

.header-container { display: flex; justify-content: space-between; align-items: center; gap: var(--space-md); width: 100%; }
.logo-section { font-size: 18px; font-weight: bold; white-space: nowrap; }
.user-section { display: flex; align-items: center; gap: 12px; }
.user-email { font-size: 14px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.nav-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; padding: 8px; color: var(--color-primary); }
.nav-toggle:hover { background: var(--color-canvas); border-radius: var(--radius-md); }

.nav-menu { display: flex; gap: 16px; flex-wrap: wrap; list-style: none; margin: 0; padding: 12px 0 0 0; border-top: 1px solid var(--color-hairline); }
.nav-menu.active { display: flex; }
.nav-link { padding: 8px 0; display: block; white-space: nowrap; }
.nav-link[aria-current="page"] { font-weight: bold; border-bottom: 2px solid var(--color-primary); }

/* === Footer === */
footer {
  background: var(--color-surface);
  padding: 20px;
  text-align: center;
  font-size: 12px;
  color: var(--color-ink-muted);
  border-top: 1px solid var(--color-hairline);
  margin-top: 40px;
}
footer p { margin: 0; }

/* === Flash Messages & Alerts === */
.flash { padding: 16px; margin-bottom: 16px; border-radius: var(--radius-lg); }

.flash.error {
  background: var(--flash-error-bg);
  color: var(--color-danger-strong);
  border: 1px solid var(--color-danger);
}

.flash.success {
  background: var(--flash-success-bg);
  color: var(--color-success-strong);
  border: 1px solid var(--color-success);
}

.flash.info {
  background: var(--flash-info-bg);
  color: var(--color-info);
  border: 1px solid var(--color-info);
}

.flash p { margin: 0; }

.error { color: var(--color-danger-strong); font-weight: bold; text-align: center; font-size: 14px; }
.success { color: var(--color-success-strong); font-weight: bold; text-align: center; font-size: 14px; }

/* === Main Content === */
main { max-width: 1000px; margin: 20px auto; padding: 0 16px; }
main h2 { font-size: 16px; margin: 24px 0 8px; }

/* === Authentication & Forms === */
.auth-container { display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 20px; }

.auth-box {
  max-width: 380px;
  margin: 0 auto;
  background: var(--color-surface);
  padding: 40px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
  width: 100%;
}

.auth-box h1 { text-align: center; font-size: 20px; margin-top: 0; }

.auth-box input, .auth-box label { display: block; width: 100%; }

.auth-box input {
  padding: 12px;
  margin: 8px 0;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-xs);
  font-size: 16px;
  background: var(--color-surface);
  color: var(--color-ink);
}

.auth-box label {
  font-weight: 600;
  margin-bottom: 4px;
  font-size: 14px;
}

.auth-box button {
  width: 100%;
  padding: 12px;
  background: var(--color-primary);
  color: var(--color-on-primary);
  border: none;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: bold;
  cursor: pointer;
  margin-top: 8px;
  min-height: 48px;
}

.auth-box button:hover { background: var(--color-primary-active); }

.secondary-link { display: block; text-align: center; margin-top: 16px; font-size: 13px; }

/* === Mail List === */
.mail-list {
  list-style: none;
  padding: 0;
  margin: 0;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  box-shadow: var(--shadow-1);
}

.mail-list li { border-bottom: 1px solid var(--color-hairline); }
.mail-list li:last-child { border-bottom: none; }

.mail-list a {
  display: flex;
  gap: 12px;
  padding: 14px 16px;
  color: var(--color-ink);
  align-items: center;
}

.mail-list a:hover { background: var(--color-canvas); text-decoration: none; }

.mail-list .from { width: 180px; flex-shrink: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 14px; }
.mail-list .subject { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 15px; }
.mail-list .date { width: 140px; flex-shrink: 0; color: var(--color-ink-muted); font-size: 13px; text-align: right; }

.mail-list li.unseen a { font-weight: bold; background: var(--color-canvas); }
.mail-list li.unseen a::before { content: '●'; color: var(--color-primary); margin-right: 8px; }

.empty { text-align: center; color: var(--color-ink-muted); padding: 40px 0; }

/* === Message View === */
.message-view {
  background: var(--color-surface);
  padding: 24px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
}

.message-view .meta { color: var(--color-ink-secondary); font-size: 14px; margin-bottom: 4px; }
.message-view h2 { margin-top: 0; }
.message-view pre { white-space: pre-wrap; word-break: break-word; font-family: inherit; }

/* === Compose Form === */
.compose-form input, .compose-form textarea {
  width: 100%;
  padding: 10px;
  margin: 6px 0;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-xs);
  font-size: 14px;
  font-family: inherit;
  background: var(--color-surface);
  color: var(--color-ink);
}

.compose-form button {
  padding: 10px 24px;
  background: var(--color-primary);
  color: var(--color-on-primary);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: bold;
}

.compose-form button:hover { background: var(--color-primary-active); }

/* === Buttons === */
.btn {
  display: inline-block;
  padding: 10px 16px;
  background: var(--color-primary);
  color: var(--color-on-primary);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: bold;
  font-size: 14px;
  text-decoration: none;
}

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

.btn-secondary {
  background: var(--color-ink-secondary);
  color: var(--color-surface);
}

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

.btn-danger {
  background: var(--color-surface);
  color: var(--color-danger-strong);
  border: 1px solid var(--color-danger);
}

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

.btn-small { padding: 6px 12px; font-size: 12px; }

.approve-btn, .reject-btn { padding: 6px 14px; border: none; border-radius: var(--radius-md); font-size: 13px; font-weight: bold; cursor: pointer; }

.approve-btn {
  background: var(--color-success-strong);
  color: var(--color-on-primary);
}

.approve-btn:hover { opacity: 0.9; }

.reject-btn {
  background: var(--color-surface);
  color: var(--color-danger-strong);
  border: 1px solid var(--color-danger);
}

.reject-btn:hover { background: var(--color-canvas); }

/* === Admin & Settings === */
.admin-list {
  list-style: none;
  padding: 0;
  margin: 0;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-1);
}

.admin-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-hairline);
}

.admin-list li:last-child { border-bottom: none; }
.admin-actions { display: flex; gap: 8px; }
.admin-actions form { margin: 0; }

.admin-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-surface);
  box-shadow: var(--shadow-1);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.admin-table th {
  background: var(--color-canvas);
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  font-size: 13px;
  color: var(--color-ink-muted);
  border-bottom: 1px solid var(--color-hairline);
}

.admin-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-hairline);
}

.admin-table tr:last-child td { border-bottom: none; }

.role-badge {
  font-size: 12px;
  color: var(--color-ink-secondary);
  background: var(--color-canvas);
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.status-badge { display: inline-block; padding: 4px 12px; border-radius: 12px; font-size: 12px; font-weight: 600; }
.status-active { background: var(--color-success); color: var(--color-on-primary); }
.status-locked { background: var(--color-danger); color: var(--color-on-primary); }

/* === Settings Form === */
.settings-form {
  background: var(--color-surface);
  padding: 20px;
  border-radius: var(--radius-lg);
  max-width: 500px;
  box-shadow: var(--shadow-1);
}

.settings-form .form-group { margin-bottom: 20px; }

.settings-form label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  font-size: 14px;
}

.settings-form input, .settings-form textarea, .settings-form select {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-xs);
  font-size: 14px;
  font-family: inherit;
  background: var(--color-canvas);
  color: var(--color-ink);
}

.settings-form textarea { resize: vertical; min-height: 120px; }
.settings-form .readonly { background: var(--color-canvas); padding: 12px; border-radius: var(--radius-md); color: var(--color-ink-muted); }
.settings-links { margin-top: 30px; padding-top: 30px; border-top: 1px solid var(--color-hairline); }
.settings-links h3 { font-size: 14px; margin-top: 0; }
.settings-links ul { list-style: none; padding: 0; margin: 0; }
.settings-links li { margin-bottom: 10px; }

/* === Form Container === */
.form-container {
  background: var(--color-surface);
  padding: 20px;
  border-radius: var(--radius-lg);
  max-width: 400px;
  box-shadow: var(--shadow-1);
}

.form-container .form-group { margin-bottom: 20px; }
.form-container label { display: block; font-weight: 600; margin-bottom: 8px; font-size: 14px; }
.form-container input, .form-container textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-xs);
  font-size: 14px;
  font-family: inherit;
  background: var(--color-canvas);
  color: var(--color-ink);
}

.form-container .btn { width: 100%; margin-right: 8px; }

/* === Contacts === */
.contacts-toolbar {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
  justify-content: space-between;
}

.contacts-toolbar .search-form { display: flex; gap: 8px; flex: 1; max-width: 400px; }
.contacts-toolbar input {
  flex: 1;
  padding: 10px;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-xs);
  font-size: 14px;
  background: var(--color-surface);
  color: var(--color-ink);
}

.contacts-toolbar .btn { white-space: nowrap; padding: 10px 20px; }

.contacts-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-surface);
  box-shadow: var(--shadow-1);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.contacts-table th {
  background: var(--color-canvas);
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  font-size: 13px;
  color: var(--color-ink-muted);
  border-bottom: 1px solid var(--color-hairline);
}

.contacts-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-hairline);
}

.contacts-table tr:last-child td { border-bottom: none; }
.contacts-table .btn-small { padding: 6px 12px; font-size: 12px; }

/* === Contact Selector === */
.recipient-field { display: flex; gap: 8px; align-items: center; }
.recipient-field input { flex: 1; }

.contact-selector-popup {
  position: absolute;
  background: var(--color-surface);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-2);
  z-index: 100;
  min-width: 300px;
  max-width: 400px;
}

.contact-selector-popup input {
  width: 100%;
  padding: 10px;
  border: none;
  border-bottom: 1px solid var(--color-hairline);
  font-size: 14px;
  background: var(--color-surface);
  color: var(--color-ink);
}

.contact-selector-popup ul { list-style: none; padding: 0; margin: 0; max-height: 300px; overflow-y: auto; }
.contact-selector-popup li { border-bottom: 1px solid var(--color-hairline); }
.contact-selector-popup li:last-child { border-bottom: none; }
.contact-item { display: block; padding: 10px 12px; color: var(--color-primary); }
.contact-item:hover { background: var(--color-canvas); }

.info { background: var(--color-canvas); color: var(--color-success-strong); padding: 12px; border-radius: var(--radius-md); font-size: 14px; }

/* === Admin Toolbar === */
.admin-toolbar { display: flex; gap: 12px; margin-bottom: 20px; justify-content: flex-start; }
.search-input { padding: 10px; border: 1px solid var(--color-hairline); border-radius: var(--radius-md); font-size: 14px; background: var(--color-surface); color: var(--color-ink); }

/* === U2: Search, Pagination & List Components === */
.search-container { margin-bottom: var(--space-lg); }
.search-form { display: flex; gap: var(--space-xs); margin-bottom: var(--space-sm); }
.search-form input { flex: 1; padding: var(--space-xs); }
.btn-search { padding: var(--space-xs) var(--space-md); }
.btn-clear { padding: var(--space-xs) var(--space-md); background: var(--color-canvas); text-decoration: none; border-radius: var(--radius-xs); color: var(--color-ink); border: none; cursor: pointer; }
.btn-clear:hover { background: var(--color-hairline); }

.pagination { margin-top: var(--space-lg); text-align: center; }
.pagination-info { margin-bottom: var(--space-sm); font-size: 13px; color: var(--color-ink-faint); }
.page-link { margin: 0 var(--space-xxs); }
.page-current { margin: 0 var(--space-xxs); font-weight: bold; }
.inline-form { display: inline; }

/* === Trash & List Components === */
.trash-container { max-width: 900px; margin: var(--space-lg) auto; }
.trash-empty { padding: var(--space-xxl); text-align: center; color: var(--color-ink-faint); }
.trash-list { border: 1px solid var(--color-hairline); }
.trash-item { border-bottom: 1px solid var(--color-hairline); padding: var(--space-sm); display: flex; justify-content: space-between; align-items: center; }
.trash-item:hover { background-color: var(--color-canvas); }
.trash-item-info { flex: 1; }
.trash-item-subject { font-weight: 500; }
.trash-item-from { color: var(--color-ink-secondary); font-size: 13px; }
.trash-item-folder { color: var(--color-ink-faint); font-size: 12px; }
.trash-item-actions { white-space: nowrap; }
.btn-restore { background-color: var(--color-primary); color: var(--color-on-primary); border: none; padding: 6px 12px; cursor: pointer; font-size: 13px; border-radius: var(--radius-xs); }
.btn-restore:hover { background-color: var(--color-primary-active); }
.btn-delete { background-color: var(--color-danger); color: var(--color-on-primary); border: none; padding: 6px 12px; cursor: pointer; font-size: 13px; border-radius: var(--radius-xs); margin-left: var(--space-xs); }
.btn-delete:hover { background-color: var(--color-danger-strong); }
.nav-link { margin: var(--space-lg) 0; text-align: center; }
.nav-link a { color: var(--color-primary); text-decoration: none; }
.nav-link a:hover { text-decoration: underline; }

/* === Admin Page Utilities === */
.audit-section { margin-top: var(--space-xxl); }
.audit-links { text-align: center; padding: var(--space-lg); }
.audit-buttons { margin-bottom: var(--space-lg); }
.status-success { color: var(--color-success-strong); }
.status-failure { color: var(--color-danger); }

/* === Mobile Responsive === */
@media (max-width: 768px) {
  body { font-size: 16px; }
  header { padding: 12px; }
  .nav-toggle { display: block; }

  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-top: 1px solid var(--color-hairline);
    border-bottom: 1px solid var(--color-hairline);
    flex-direction: column;
    padding: 12px 20px;
    gap: 8px;
    box-shadow: var(--shadow-1);
  }

  .nav-menu.active { display: flex; }
  .nav-link { padding: 12px 0; font-size: 15px; }

  .mail-list .from { width: 120px; }
  .mail-list .date { width: 100px; font-size: 12px; }
  .mail-list .subject { min-width: 150px; }
  .mail-list a { gap: 8px; padding: 12px 12px; flex-direction: column; align-items: flex-start; }
  .mail-list .from { width: 100%; }
  .mail-list .subject { width: 100%; }
  .mail-list .date { width: 100%; text-align: left; }

  .contacts-table { font-size: 13px; }
  .contacts-table th, .contacts-table td { padding: 10px 8px; }
  .admin-table { font-size: 13px; }
  .admin-table th, .admin-table td { padding: 10px 8px; }

  .btn, .approve-btn, .reject-btn, .btn-small { min-height: 44px; min-width: 44px; padding: 10px 16px; font-size: 14px; }
  .compose-form button { min-height: 44px; }

  main { padding: 0 12px; }
  .auth-box { padding: 24px 20px; margin: 0; }

  .contacts-toolbar { flex-direction: column; }
  .contacts-toolbar .search-form { max-width: 100%; }

  table { font-size: 13px; }
  table th, table td { padding: 10px 8px; }
}

@media (max-width: 480px) {
  body { font-size: 14px; }
  header { padding: 8px 12px; }
  .user-email { display: none; }
  .logo-section { font-size: 16px; }

  .mail-list a { padding: 10px 8px; }
  .mail-list .from { width: 100px; }
  .mail-list .subject { min-width: 120px; font-size: 13px; }

  .btn, .approve-btn, .reject-btn { padding: 10px 12px; font-size: 13px; }

  .compose-form input, .compose-form textarea { font-size: 16px; }

  main h2 { font-size: 16px; margin: 16px 0 8px; }

  .admin-table { font-size: 12px; }
  .admin-table th, .admin-table td { padding: 8px 6px; }
}

/* === Accessibility === */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

/* === Print === */
@media print {
  header, footer, .nav-toggle, .btn, .admin-actions, .contacts-toolbar .btn { display: none; }
  body { background: var(--color-surface); }
  .mail-list { box-shadow: none; }
}

/* ╔══════════════════════════════════════════════════════════════════════════╗
   ║ U3 — 메일 UX 개편 (Notion 컴포넌트 기반)                              ║
   ╚══════════════════════════════════════════════════════════════════════════╝ */

/* ── ex-data-table-cell: 메일 목록 (inbox/sent/trash) ────── */
.mail-list-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-hairline);
}

.mail-list-table thead {
  background: var(--color-canvas);
  border-bottom: 1px solid var(--color-hairline);
}

.mail-list-table th {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.125px;
  color: var(--color-ink-muted);
  text-transform: uppercase;
}

.mail-list-table tbody tr {
  border-bottom: 1px solid var(--color-hairline);
  transition: background-color 0.15s ease;
}

.mail-list-table tbody tr:hover {
  background: var(--color-canvas);
}

.mail-list-table tbody tr.unseen {
  font-weight: 500;
}

.mail-list-table td {
  padding: var(--space-sm) var(--space-md);
  font-size: 15px;
  line-height: 1.33;
  color: var(--color-ink-secondary);
}

.mail-list-table a {
  color: inherit;
  text-decoration: none;
  display: flex;
  gap: var(--space-md);
  align-items: center;
}

.mail-list-table a:hover {
  color: var(--color-primary);
}

/* ── ex-empty-state-card: 빈 목록 상태 ────── */
.empty-state {
  background: var(--color-canvas);
  border: 1px dashed var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-xxl);
  text-align: center;
  color: var(--color-ink-muted);
}

.empty-state p {
  margin: 0;
  font-size: 16px;
  line-height: 1.5;
}

/* ── feature-card: 메시지 상세 뷰 ────── */
.message-view-card {
  background: var(--color-surface);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin: 0 0 var(--space-lg);
}

.message-view-header {
  border-bottom: 1px solid var(--color-hairline);
  padding-bottom: var(--space-md);
  margin-bottom: var(--space-md);
}

.message-view-header h2 {
  margin: 0 0 var(--space-md);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.27;
  color: var(--color-ink);
}

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

.message-view-meta p {
  margin: 0;
  font-size: 14px;
  line-height: 1.43;
  color: var(--color-ink-muted);
}

.message-view-meta strong {
  color: var(--color-ink-secondary);
  font-weight: 500;
}

.message-view-body {
  margin: var(--space-lg) 0;
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-ink);
  white-space: pre-wrap;
  word-break: break-word;
}

/* ── badge-pill: 첨부파일 칩 ────── */
.attachment-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 4px 8px;
  background: var(--color-surface);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.attachment-badge:hover {
  background: var(--color-canvas);
  border-color: var(--color-primary);
}

.attachment-size {
  font-size: 11px;
  color: var(--color-ink-muted);
  font-weight: 400;
}

.attachments-container {
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-hairline);
}

.attachments-container h3 {
  margin: 0 0 var(--space-md);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.125px;
}

.attachments-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  list-style: none;
  margin: 0;
  padding: 0;
}

/* ── ex-toast: 플래시 메시지 ────── */
.flash-toast {
  padding: var(--space-sm) var(--space-md);
  margin: var(--space-md) 0;
  border-radius: var(--radius-lg);
  border-left: 4px solid;
  font-size: 15px;
  line-height: 1.33;
  box-shadow: var(--shadow-1);
}

.flash-toast p {
  margin: 0;
}

.flash-toast.success {
  background: rgba(26, 174, 57, 0.08);
  border-left-color: var(--color-success-strong);
  color: var(--color-success-strong);
}

.flash-toast.error {
  background: rgba(120, 52, 0, 0.08);
  border-left-color: var(--color-danger-strong);
  color: var(--color-danger-strong);
}

.flash-toast.info {
  background: rgba(0, 117, 222, 0.08);
  border-left-color: var(--color-primary);
  color: var(--color-primary);
}

/* ── Pagination: 현대적 페이지네이션 ────── */
.pagination-modern {
  display: flex;
  gap: var(--space-xs);
  justify-content: center;
  flex-wrap: wrap;
  margin: var(--space-lg) 0;
  font-size: 14px;
}

.pagination-modern a,
.pagination-modern strong {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 32px;
  padding: 0 8px;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--color-primary);
  font-weight: 500;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.pagination-modern a:hover {
  background: var(--color-canvas);
  border-color: var(--color-primary);
}

.pagination-modern strong {
  background: var(--color-primary);
  color: var(--color-on-primary);
  border-color: var(--color-primary);
  cursor: default;
}

.pagination-info {
  text-align: center;
  font-size: 13px;
  color: var(--color-ink-muted);
  margin: var(--space-md) 0;
}

/* ── Compose form (send.php) ────── */
.compose-form-card {
  background: var(--color-surface);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin: var(--space-lg) 0;
}

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

.compose-field label {
  display: block;
  margin-bottom: var(--space-xs);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink);
}

.compose-field input,
.compose-field textarea {
  width: 100%;
  padding: var(--space-sm);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-xs);
  font-family: inherit;
  font-size: 15px;
  color: var(--color-ink);
  background: var(--color-surface);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.compose-field input:focus,
.compose-field textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 117, 222, 0.1);
}

.compose-field textarea {
  min-height: 300px;
  resize: vertical;
}

/* ── Dark mode overrides for U3 ────── */
@media (prefers-color-scheme: dark) {
  .mail-list-table thead { background: rgba(255, 255, 255, 0.05); }
  .mail-list-table tbody tr:hover { background: rgba(255, 255, 255, 0.05); }
  .empty-state { border-color: var(--color-hairline); }
  .message-view-card { background: var(--color-surface); }
  .attachment-badge:hover { background: rgba(255, 255, 255, 0.05); }
  .compose-field input:focus,
  .compose-field textarea:focus { box-shadow: 0 0 0 3px rgba(0, 117, 222, 0.2); }
}

/* ── Inline style overrides for dark mode (U2에서 완전히 정리) ── */
p[style*="color: #666"] { color: var(--color-ink-muted) !important; }
strong[style*="background: #f5f5f5"] { background: var(--color-canvas) !important; border-color: var(--color-hairline) !important; }
a[style*="background: #6c757d"] { background: var(--color-ink-secondary) !important; }