/*
  Палитра:
  --paper     #F2F4F2  фон, бумага
  --surface   #FFFFFF  карточки, панели
  --ink       #16232E  основной текст
  --slate     #5C6B72  вторичный текст
  --line      #DDE3E1  границы
  --stamp     #2C6E63  акцент (почтовая печать)
  --stamp-dk  #1F4F47  акцент, hover
  --amber     #D98E2B  непрочитано
  --danger    #B23A2E  ошибки

  Шрифты: системный sans для текста, системный monospace для
  меток/дат/адресов — без внешних CDN, чтобы сервис разворачивался
  где угодно без зависимости от интернет-доступа к шрифтам.
*/

:root {
    --paper: #F2F4F2;
    --surface: #FFFFFF;
    --ink: #16232E;
    --slate: #5C6B72;
    --line: #DDE3E1;
    --stamp: #2C6E63;
    --stamp-dk: #1F4F47;
    --amber: #D98E2B;
    --danger: #B23A2E;
    --danger-bg: #FBEAE8;

    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--font-sans);
    -webkit-font-smoothing: antialiased;
}

button, input { font-family: inherit; }

a { color: var(--stamp-dk); }

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: 1px solid transparent;
    border-radius: 8px;
    padding: 10px 18px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 120ms ease, border-color 120ms ease, transform 80ms ease;
}
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid var(--stamp); outline-offset: 2px; }
.btn-block { width: 100%; }

.btn-primary {
    background: var(--stamp);
    color: #fff;
}
.btn-primary:hover { background: var(--stamp-dk); }
.btn-primary:disabled { opacity: 0.6; cursor: default; }

.btn-ghost {
    background: transparent;
    border-color: var(--line);
    color: var(--slate);
}
.btn-ghost:hover { border-color: var(--slate); color: var(--ink); }

.btn-danger {
    background: var(--danger);
    color: #fff;
}
.btn-danger:hover { background: #92271D; }

.btn-icon {
    display: inline-block;
    transition: transform 400ms ease;
}
.btn.is-loading .btn-icon { animation: spin 800ms linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Auth screen ---------- */
.auth-screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.auth-card {
    width: 100%;
    max-width: 380px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 40px 32px;
    box-shadow: 0 1px 2px rgba(22, 35, 46, 0.04), 0 12px 32px rgba(22, 35, 46, 0.06);
}

.auth-mark {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: var(--stamp);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    margin-bottom: 20px;
}

.auth-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--stamp-dk);
    background: rgba(44, 110, 99, 0.1);
    border: 1px solid rgba(44, 110, 99, 0.25);
    border-radius: 999px;
    padding: 6px 12px;
    margin: 0 0 12px;
}

.auth-title {
    font-size: 22px;
    font-weight: 700;
    margin: 0 0 6px;
}

.auth-subtitle {
    font-size: 14px;
    color: var(--slate);
    margin: 0 0 24px;
}

.auth-form { display: flex; flex-direction: column; gap: 16px; }

.field { display: flex; flex-direction: column; gap: 6px; }

.field-label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--slate);
    font-family: var(--font-mono);
}

.field input {
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 11px 12px;
    font-size: 15px;
    color: var(--ink);
    background: var(--paper);
}
.field input:focus-visible {
    outline: 2px solid var(--stamp);
    outline-offset: 1px;
    background: var(--surface);
}

.alert {
    border-radius: 8px;
    padding: 10px 12px;
    font-size: 13px;
    margin-bottom: 16px;
}
.alert-error {
    background: var(--danger-bg);
    color: var(--danger);
    border: 1px solid rgba(178, 58, 46, 0.25);
}

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

.topbar {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 14px 24px;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    flex-shrink: 0;
}

.topbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
}
.topbar-mark {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: var(--stamp);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    flex-shrink: 0;
}
.topbar-email {
    font-size: 14px;
    font-weight: 600;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.topbar-stats {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}
.stat-pill {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--slate);
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 4px 10px;
}

.topbar-actions {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.mail-body {
    flex: 1;
    display: grid;
    grid-template-columns: 380px 1fr;
    min-height: 0;
}

.list-pane {
    border-right: 1px solid var(--line);
    overflow-y: auto;
    background: var(--surface);
}

.reading-pane {
    overflow-y: auto;
    background: var(--paper);
    display: flex;
    flex-direction: column;
}

.reading-placeholder {
    margin: auto;
    text-align: center;
    color: var(--slate);
}
.reading-placeholder-mark {
    display: block;
    font-size: 32px;
    margin-bottom: 10px;
    opacity: 0.4;
}
.reading-placeholder p { font-size: 14px; margin: 0; }

.reading-header {
    padding: 24px 28px 16px;
    border-bottom: 1px solid var(--line);
    background: var(--surface);
    flex-shrink: 0;
}
.reading-subject {
    font-size: 19px;
    font-weight: 700;
    margin: 0 0 10px;
}
.reading-meta {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
}
.reading-from {
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 600;
}
.reading-date {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--slate);
    flex-shrink: 0;
}
.reading-to {
    margin-top: 6px;
    font-size: 12px;
    color: var(--slate);
}

.reading-attachments {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 12px 28px;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    flex-shrink: 0;
}
.attachment-chip {
    font-size: 12px;
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 4px 10px;
    color: var(--slate);
}

.reading-frame {
    flex: 1;
    width: 100%;
    border: none;
    background: #fff;
}

/* ---------- Ledger (message list) ---------- */
.ledger {
    list-style: none;
    margin: 0;
    padding: 0;
}

.ledger-row {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 16px 20px;
    border-bottom: 1px solid var(--line);
    position: relative;
    cursor: pointer;
}
.ledger-row:last-child { border-bottom: none; }
.ledger-row:hover { background: var(--paper); }
.ledger-row:focus-visible { outline: 2px solid var(--stamp); outline-offset: -2px; }

.ledger-row.is-active {
    background: rgba(44, 110, 99, 0.08);
}
.ledger-row.is-active::before {
    content: "";
    position: absolute;
    left: 0; top: 0; bottom: 0;
    width: 3px;
    background: var(--stamp);
}

.ledger-index {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--slate);
    padding-top: 2px;
    flex-shrink: 0;
    width: 44px;
}

.ledger-main { flex: 1; min-width: 0; }

.ledger-top {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 4px;
}

.ledger-from {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--ink);
    font-weight: 600;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.ledger-date {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--slate);
    flex-shrink: 0;
}

.ledger-subject {
    font-size: 14px;
    color: var(--ink);
}

.empty-state {
    background: var(--surface);
    border: 1px dashed var(--line);
    border-radius: 12px;
    padding: 48px 24px;
    text-align: center;
}
.empty-title { font-size: 16px; font-weight: 600; margin: 0 0 4px; }
.empty-subtitle { font-size: 14px; color: var(--slate); margin: 0; }

#list-region { padding: 12px; }
.empty-state { margin: 8px; }
#list-region > .alert { margin: 8px; }

@media (max-width: 860px) {
    .mail-body { grid-template-columns: 1fr; }
    .list-pane { max-height: 40vh; border-right: none; border-bottom: 1px solid var(--line); }
    .reading-pane { flex: 1; }
    .topbar { flex-wrap: wrap; gap: 12px; }
    .topbar-stats { order: 3; width: 100%; }
}

@media (max-width: 480px) {
    .reading-header { padding: 18px 16px 12px; }
    .reading-attachments { padding: 10px 16px; }
    .reading-meta { flex-direction: column; align-items: flex-start; gap: 2px; }
}

/* ---------- Settings page ---------- */
.settings-page {
    min-height: 100vh;
    padding: 40px 24px;
}

.settings-container {
    max-width: 760px;
    margin: 0 auto;
}

.settings-topbar {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 24px;
}

.settings-title {
    font-size: 26px;
    font-weight: 700;
    margin: 0 0 4px;
}
.settings-subtitle {
    font-size: 14px;
    color: var(--slate);
    margin: 0;
}

.settings-tabs {
    display: flex;
    gap: 24px;
    border-bottom: 1px solid var(--line);
    margin-bottom: 20px;
}
.settings-tab {
    font-size: 14px;
    font-weight: 600;
    color: var(--slate);
    padding: 10px 2px;
    border-bottom: 2px solid transparent;
}
.settings-tab.is-active {
    color: var(--stamp-dk);
    border-bottom-color: var(--stamp);
}

.settings-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 20px;
}

.settings-card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 18px;
}

.settings-card-title {
    font-size: 17px;
    font-weight: 700;
    margin: 0 0 4px;
}
.settings-card-subtitle {
    font-size: 13px;
    color: var(--slate);
    margin: 0 0 16px;
}
.settings-card-header .settings-card-subtitle { margin-bottom: 0; }

.settings-count {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--slate);
    flex-shrink: 0;
    padding-top: 2px;
}

.account-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 10px;
}

.account-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--stamp);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 15px;
    flex-shrink: 0;
}

.account-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
    flex: 1;
}
.account-name { font-size: 14px; font-weight: 700; }
.account-email {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--slate);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.account-meta { font-size: 12px; color: var(--slate); }

.account-badge {
    font-size: 12px;
    font-weight: 600;
    color: var(--stamp-dk);
    background: rgba(44, 110, 99, 0.1);
    border: 1px solid rgba(44, 110, 99, 0.25);
    border-radius: 999px;
    padding: 4px 12px;
    flex-shrink: 0;
}

.settings-password-form { max-width: 420px; }
.settings-submit { margin-top: 4px; align-self: flex-start; }

/* ---------- Admin ---------- */
.admin-form {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
    align-items: end;
}

.admin-input {
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 10px 12px;
    font-size: 14px;
    color: var(--ink);
    background: var(--paper);
    width: 100%;
}
.admin-input:focus-visible {
    outline: 2px solid var(--stamp);
    outline-offset: 1px;
    background: var(--surface);
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
.admin-table th {
    text-align: left;
    font-family: var(--font-mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--slate);
    padding: 8px 10px;
    border-bottom: 1px solid var(--line);
}
.admin-table td {
    padding: 10px;
    border-bottom: 1px solid var(--line);
    vertical-align: top;
}
.admin-mail { font-weight: 600; }
.admin-mono { font-family: var(--font-mono); font-size: 12px; color: var(--slate); }
.admin-dim { color: var(--slate); white-space: nowrap; }

.admin-edit summary {
    cursor: pointer;
    font-size: 12px;
    padding: 6px 12px;
    display: inline-block;
    border-radius: 8px;
}
.admin-inline-form {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 10px;
    align-items: center;
}
.admin-inline-form .admin-input { width: auto; flex: 1; min-width: 160px; margin: 0; }

@media (max-width: 640px) {
    .admin-table { display: block; overflow-x: auto; }
}

.alert-success {
    background: rgba(44, 110, 99, 0.08);
    color: var(--stamp-dk);
    border: 1px solid rgba(44, 110, 99, 0.25);
}

@media (max-width: 480px) {
    .settings-page { padding: 24px 16px; }
    .settings-topbar { flex-direction: column; }
    .account-item { flex-wrap: wrap; }
    .account-badge { margin-left: 54px; }
}