/* ==========================================================================
   MailPilot AI - 업무용 통합 이메일 관리 웹앱
   1단계: 기본 UI (Mock Data 기반)
   ========================================================================== */

:root {
  --color-bg: #f4f6f8;
  --color-surface: #ffffff;
  --color-border: #e2e5e9;
  --color-border-strong: #d3d7dc;
  --color-text: #1f2429;
  --color-text-muted: #6b7280;
  --color-text-faint: #98a2ae;

  --color-primary: #2f5fe0;
  --color-primary-dark: #2347b3;
  --color-primary-bg: #eaf0ff;

  --color-accent: #7c4dff;

  --color-urgent: #d63031;
  --color-urgent-bg: #fdeaea;
  --color-high: #e07b1a;
  --color-high-bg: #fef1e2;
  --color-normal: #2f5fe0;
  --color-normal-bg: #eaf0ff;
  --color-low: #6b7280;
  --color-low-bg: #eef0f2;

  --color-status-reply: #d63031;
  --color-status-work: #e07b1a;
  --color-status-check: #2f5fe0;

  --sidebar-width: 220px;
  --ai-panel-width: 320px;
  --mail-list-width: 380px;
  --topbar-height: 52px;

  --radius-sm: 6px;
  --radius-md: 10px;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06);
  --shadow-md: 0 4px 10px rgba(16, 24, 40, 0.08);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: "Pretendard", -apple-system, BlinkMacSystemFont, "Segoe UI", "Malgun Gothic", "Apple SD Gothic Neo", Roboto, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}

button {
  font-family: inherit;
  cursor: pointer;
}

input, select {
  font-family: inherit;
  font-size: 13px;
}

.app-shell {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* ---------------- Topbar ---------------- */
.topbar {
  height: var(--topbar-height);
  min-height: var(--topbar-height);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  z-index: 20;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.2px;
}

.brand-icon {
  color: var(--color-primary);
  font-size: 16px;
}

.brand-accent {
  color: var(--color-primary);
  font-weight: 800;
}

.topbar-spacer { flex: 1; }

.icon-btn {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  background: transparent;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: background 0.12s ease, color 0.12s ease;
}
.icon-btn:hover {
  background: var(--color-bg);
  color: var(--color-text);
  border-color: var(--color-border);
}

.mobile-only { display: none; }

/* ---------------- Main Body Layout ---------------- */
.main-body {
  flex: 1;
  display: flex;
  min-height: 0;
  overflow: hidden;
}

/* ---------------- Sidebar ---------------- */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.sidebar-nav {
  flex: 1;
  padding: 12px 8px;
}

.nav-group {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-divider {
  height: 1px;
  background: var(--color-border);
  margin: 10px 8px;
}

.nav-item {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 13.5px;
  text-align: left;
  transition: background 0.12s ease;
}

.nav-item i {
  width: 16px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 14px;
}

.nav-item span:nth-of-type(1) {
  flex: 1;
}

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

.nav-item.is-active {
  background: var(--color-primary-bg);
  color: var(--color-primary-dark);
  font-weight: 600;
}
.nav-item.is-active i {
  color: var(--color-primary);
}

.nav-count {
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  border-radius: 10px;
  background: var(--color-border);
  color: var(--color-text-muted);
  font-size: 11px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}
.nav-item.is-active .nav-count {
  background: var(--color-primary);
  color: #fff;
}

.sidebar-footer {
  padding: 10px 14px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-faint);
  font-size: 11.5px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ---------------- Mail View (center) ---------------- */
.mail-view {
  flex: 1;
  display: flex;
  min-width: 0;
  overflow: hidden;
}

.mail-list-col {
  width: var(--mail-list-width);
  min-width: 280px;
  max-width: 460px;
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  overflow: hidden;
}

.mail-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--color-border);
}

.search-box {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 7px 10px;
}
.search-box i { color: var(--color-text-faint); font-size: 12.5px; }
.search-box input {
  flex: 1;
  border: none;
  background: transparent;
  outline: none;
  font-size: 13px;
  color: var(--color-text);
}

.filter-row {
  display: flex;
  gap: 8px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--color-border);
}

.filter-select {
  flex: 1;
  padding: 6px 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 12.5px;
}

.list-view-title {
  padding: 10px 14px 6px;
  font-size: 12px;
  font-weight: 700;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.mail-list {
  flex: 1;
  overflow-y: auto;
  padding-bottom: 12px;
}

.mail-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--color-border);
  cursor: pointer;
  transition: background 0.12s ease;
  position: relative;
}
.mail-item:hover { background: var(--color-bg); }
.mail-item.is-selected {
  background: var(--color-primary-bg);
  border-left: 3px solid var(--color-primary);
}
.mail-item.is-unread .mail-sender { font-weight: 700; }
.mail-item.is-unread .mail-subject { font-weight: 700; color: var(--color-text); }

.mail-item-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}

.mail-sender {
  font-size: 13px;
  color: var(--color-text);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mail-time {
  font-size: 11.5px;
  color: var(--color-text-faint);
  white-space: nowrap;
}

.mail-subject {
  font-size: 13px;
  color: var(--color-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mail-preview {
  font-size: 12px;
  color: var(--color-text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mail-badges {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 2px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  line-height: 1.6;
  white-space: nowrap;
}

.badge-importance-긴급 { background: var(--color-urgent-bg); color: var(--color-urgent); }
.badge-importance-높음 { background: var(--color-high-bg); color: var(--color-high); }
.badge-importance-보통 { background: var(--color-normal-bg); color: var(--color-normal); }
.badge-importance-낮음 { background: var(--color-low-bg); color: var(--color-low); }

.badge-category {
  background: #f1f0fb;
  color: #6c4bd6;
}

.badge-status {
  background: transparent;
  border: 1px solid var(--color-border-strong);
  color: var(--color-text-muted);
}
.badge-status-답장.필요 { color: var(--color-status-reply); border-color: var(--color-status-reply); }
.badge-status-업무.필요 { color: var(--color-status-work); border-color: var(--color-status-work); }
.badge-status-확인.필요 { color: var(--color-status-check); border-color: var(--color-status-check); }

.mail-attachment-icon {
  color: var(--color-text-faint);
  font-size: 11.5px;
  margin-left: 4px;
}

/* ---------------- Mail Detail Column ---------------- */
.mail-detail-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--color-bg);
  overflow-y: auto;
}

.mail-detail-empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: var(--color-text-faint);
  font-size: 13px;
}
.mail-detail-empty i { font-size: 40px; }

.mail-detail {
  padding: 22px 28px;
  max-width: 760px;
}

.mail-detail-header {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  margin-bottom: 16px;
}

.mail-detail-subject {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 12px 0;
  color: var(--color-text);
}

.mail-detail-badges {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.mail-detail-meta {
  display: grid;
  grid-template-columns: 60px 1fr;
  row-gap: 6px;
  column-gap: 10px;
  font-size: 12.5px;
  border-top: 1px solid var(--color-border);
  padding-top: 12px;
}
.mail-detail-meta dt {
  color: var(--color-text-faint);
  font-weight: 600;
}
.mail-detail-meta dd {
  margin: 0;
  color: var(--color-text);
}

.mail-detail-body {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 22px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--color-text);
  white-space: pre-line;
}

.mail-detail-attachments {
  margin-top: 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 18px;
}
.mail-detail-attachments-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-text-muted);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.attachment-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  font-size: 12.5px;
  margin-right: 8px;
  margin-bottom: 8px;
}
.attachment-chip i { color: var(--color-primary); }
.attachment-empty {
  color: var(--color-text-faint);
  font-size: 12.5px;
}

/* ---------------- Page View (accounts / settings / addAccount) ---------------- */
.page-view {
  flex: 1;
  overflow-y: auto;
  padding: 28px 32px;
  background: var(--color-bg);
}

.page-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
}
.page-subtitle {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  margin-bottom: 14px;
}

.account-card {
  display: flex;
  align-items: center;
  gap: 14px;
}
.account-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--color-primary-bg);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 15px;
  flex-shrink: 0;
}
.account-info { flex: 1; min-width: 0; }
.account-email { font-weight: 600; font-size: 13.5px; }
.account-provider { font-size: 12px; color: var(--color-text-muted); }
.account-provider i { margin-right: 4px; }
.account-status {
  font-size: 11.5px;
  padding: 3px 10px;
  border-radius: 999px;
  background: #e8f7ee;
  color: #1f9254;
  font-weight: 600;
  white-space: nowrap;
}

.account-avatar-img {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 1px solid var(--color-border);
}

.account-disconnect-btn {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-urgent);
  font-size: 11.5px;
  font-weight: 600;
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: background 0.12s ease;
}
.account-disconnect-btn:hover { background: var(--color-urgent-bg); }

.accounts-section-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  margin: 18px 0 8px;
}
.accounts-section-title:first-child { margin-top: 0; }

.accounts-empty {
  color: var(--color-text-faint);
  font-size: 12.5px;
  padding: 4px 0 8px;
}

.add-account-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
}
.add-account-option {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 14px;
  text-align: center;
  background: var(--color-surface);
  color: var(--color-text-muted);
  cursor: not-allowed;
  opacity: 0.65;
}
.add-account-option i {
  font-size: 26px;
  margin-bottom: 10px;
  display: block;
}
.add-account-option .opt-label { font-weight: 600; font-size: 13px; color: var(--color-text); }
.add-account-option .opt-note { font-size: 11px; margin-top: 4px; }

.add-account-option.is-active {
  cursor: pointer;
  opacity: 1;
  color: var(--color-text);
  transition: border-color 0.12s ease, box-shadow 0.12s ease;
}
.add-account-option.is-active i { color: var(--color-primary); }
.add-account-option.is-active:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}
.add-account-option.is-active .opt-note { color: var(--color-text-faint); }

.oauth-banner {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  font-size: 12.5px;
  margin-bottom: 16px;
  line-height: 1.5;
}
.oauth-banner-success {
  background: #e8f7ee;
  color: #1f9254;
  border: 1px solid #b9e6cb;
}
.oauth-banner-error {
  background: var(--color-urgent-bg);
  color: var(--color-urgent);
  border: 1px solid #f3c6c6;
}
.oauth-banner i { margin-top: 1px; }

.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
}
.settings-row:last-child { border-bottom: none; }
.settings-row-label { font-size: 13px; font-weight: 600; }
.settings-row-desc { font-size: 12px; color: var(--color-text-muted); margin-top: 2px; }

.toggle-switch {
  width: 40px;
  height: 22px;
  border-radius: 999px;
  background: var(--color-border-strong);
  position: relative;
  flex-shrink: 0;
  cursor: not-allowed;
  opacity: 0.6;
}
.toggle-switch.is-on { background: var(--color-primary); }
.toggle-switch::after {
  content: '';
  position: absolute;
  top: 2px; left: 2px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: #fff;
  transition: left 0.15s ease;
}
.toggle-switch.is-on::after { left: 20px; }

.badge-soon {
  display: inline-block;
  font-size: 10.5px;
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-primary-bg);
  padding: 2px 7px;
  border-radius: 999px;
  margin-left: 6px;
}

/* ---------------- AI Assistant Panel ---------------- */
.ai-panel {
  width: var(--ai-panel-width);
  min-width: var(--ai-panel-width);
  background: var(--color-surface);
  border-left: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.ai-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px 6px;
}

.ai-header-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 14px;
  color: var(--color-text);
}
.ai-header-title i { color: var(--color-accent); }

.ai-subtitle {
  padding: 0 16px 12px;
  font-size: 12px;
  color: var(--color-text-muted);
  margin: 0;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 14px;
}

.ai-quick-actions {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
}

.quick-action-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  text-align: left;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  font-size: 12px;
  color: var(--color-text);
  transition: background 0.12s ease, border-color 0.12s ease;
}
.quick-action-btn i { color: var(--color-primary); width: 14px; text-align: center; }
.quick-action-btn:hover {
  background: var(--color-primary-bg);
  border-color: var(--color-primary);
}

.ai-chat {
  flex: 1;
  overflow-y: auto;
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.ai-message {
  display: flex;
  gap: 8px;
  align-items: flex-start;
}

.ai-message-user {
  flex-direction: row-reverse;
}

.ai-msg-icon {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--color-primary-bg);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  flex-shrink: 0;
}

.ai-message-user .ai-msg-icon {
  background: var(--color-primary);
  color: #fff;
}

.ai-msg-bubble {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  font-size: 12.5px;
  line-height: 1.6;
  max-width: 220px;
}

.ai-message-user .ai-msg-bubble {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.ai-msg-note {
  display: inline-block;
  margin-top: 6px;
  color: var(--color-text-faint);
  font-size: 11px;
}
.ai-message-user .ai-msg-note { color: #dbe6ff; }

.ai-input-row {
  display: flex;
  gap: 8px;
  padding: 12px 16px;
  border-top: 1px solid var(--color-border);
}

.ai-input-row input {
  flex: 1;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 9px 12px;
  font-size: 12.5px;
  outline: none;
  color: var(--color-text);
}
.ai-input-row input:focus { border-color: var(--color-primary); }

.ai-send-btn {
  width: 36px;
  height: 36px;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  flex-shrink: 0;
  transition: background 0.12s ease;
}
.ai-send-btn:hover { background: var(--color-primary-dark); }

/* ---------------- Scrollbars ---------------- */
.mail-list::-webkit-scrollbar,
.ai-chat::-webkit-scrollbar,
.sidebar::-webkit-scrollbar,
.mail-detail-col::-webkit-scrollbar,
.page-view::-webkit-scrollbar {
  width: 7px;
}
.mail-list::-webkit-scrollbar-thumb,
.ai-chat::-webkit-scrollbar-thumb,
.sidebar::-webkit-scrollbar-thumb,
.mail-detail-col::-webkit-scrollbar-thumb,
.page-view::-webkit-scrollbar-thumb {
  background: var(--color-border-strong);
  border-radius: 4px;
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 1200px) {
  :root { --ai-panel-width: 280px; }
  .mail-detail { max-width: 100%; }
}

@media (max-width: 1024px) {
  .ai-panel {
    position: fixed;
    right: 0;
    top: var(--topbar-height);
    bottom: 0;
    width: 300px;
    z-index: 30;
    box-shadow: var(--shadow-md);
    transform: translateX(100%);
    transition: transform 0.2s ease;
  }
  .ai-panel.is-open { transform: translateX(0); }
  .mobile-only.icon-btn#ai-toggle { display: flex; }
}

@media (max-width: 860px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: var(--topbar-height);
    bottom: 0;
    width: 220px;
    z-index: 30;
    box-shadow: var(--shadow-md);
    transform: translateX(-100%);
    transition: transform 0.2s ease;
  }
  .sidebar.is-open { transform: translateX(0); }
  .mobile-only#sidebar-toggle { display: flex; }

  .mail-list-col {
    width: 100%;
    min-width: 0;
  }
  .mail-view.detail-active .mail-list-col { display: none; }
  .mail-view:not(.detail-active) .mail-detail-col { display: none; }
  .mail-view:not(.detail-active) .mail-detail-empty { display: none !important; }

  .mail-detail-back {
    display: inline-flex !important;
  }
}

@media (min-width: 861px) {
  .mail-detail-back { display: none !important; }
}

.mail-detail-back {
  display: none;
  align-items: center;
  gap: 6px;
  border: none;
  background: transparent;
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 600;
  padding: 4px 0 14px;
  cursor: pointer;
}

@media (max-width: 620px) {
  :root { --mail-list-width: 100%; }
  .filter-row { flex-wrap: wrap; }
  .mail-detail { padding: 16px; }
  .mail-detail-header { padding: 14px 16px; }
}