:root {
    color-scheme: light;
    --bg: #f6f8fa;
    --surface: #ffffff;
    --surface-subtle: #f6f8fa;
    --surface-hover: #f3f4f6;
    --surface-active: #eef1f4;
    --text: #1f2328;
    --text-secondary: #59636e;
    --text-muted: #818b98;
    --border: #d0d7de;
    --border-muted: #e6e9ed;
    --accent: #e50914;
    --accent-hover: #c80710;
    --accent-soft: #fff0f1;
    --danger: #cf222e;
    --danger-soft: #fff1f3;
    --focus: rgba(9, 105, 218, .28);
    --button: #25292e;
    --button-hover: #15181c;
    --reader-bg: #eef1f4;
    --radius-sm: 5px;
    --radius: 7px;
    --radius-lg: 10px;
    --header-height: 56px;
}

html[data-theme="dark"] {
    color-scheme: dark;
    --bg: #0d1117;
    --surface: #151b23;
    --surface-subtle: #171d25;
    --surface-hover: #1c232d;
    --surface-active: #222b36;
    --text: #f0f6fc;
    --text-secondary: #b1bac4;
    --text-muted: #8b949e;
    --border: #3d444d;
    --border-muted: #2a313b;
    --accent: #ff3942;
    --accent-hover: #ff5058;
    --accent-soft: rgba(229, 9, 20, .13);
    --danger: #ff7b72;
    --danger-soft: rgba(248, 81, 73, .12);
    --focus: rgba(88, 166, 255, .35);
    --button: #f0f6fc;
    --button-hover: #ffffff;
    --reader-bg: #090d12;
}

@media (prefers-color-scheme: dark) {
    html[data-theme="system"] {
        color-scheme: dark;
    }
}

* { box-sizing: border-box; }

html { min-height: 100%; }

body {
    margin: 0;
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    font: 14px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; text-decoration: none; }

.icon {
    width: 16px;
    height: 16px;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
    flex: 0 0 auto;
}

.app-header {
    position: sticky;
    top: 0;
    z-index: 20;
    min-height: var(--header-height);
    background: color-mix(in srgb, var(--surface) 94%, transparent);
    border-bottom: 1px solid var(--border-muted);
    backdrop-filter: blur(12px);
}

.app-header-inner {
    width: min(1180px, 100%);
    min-height: var(--header-height);
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    min-width: 0;
    color: var(--text);
    font-weight: 650;
    letter-spacing: -.01em;
}

.brand-mark {
    width: 26px;
    height: 26px;
    display: block;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.header-actions form { margin: 0; }

.scope-badge {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    height: 30px;
    padding: 0 10px;
    color: var(--text-secondary);
    background: var(--surface-subtle);
    border: 1px solid var(--border-muted);
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
}

.scope-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
}

.button,
.icon-button,
.appearance-button {
    appearance: none;
    border: 1px solid transparent;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 600;
    transition: background-color 120ms ease, border-color 120ms ease, color 120ms ease;
}

.button {
    min-height: 34px;
    padding: 6px 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    white-space: nowrap;
}

.button-primary {
    color: #fff;
    background: var(--button);
    border-color: var(--button);
}

html[data-theme="dark"] .button-primary { color: #0d1117; }

.button-primary:hover { background: var(--button-hover); border-color: var(--button-hover); }

.button-secondary {
    color: var(--text);
    background: var(--surface);
    border-color: var(--border);
}

.button-secondary:hover { background: var(--surface-hover); }

.button-block { width: 100%; }

.icon-button,
.theme-toggle-auth {
    width: 34px;
    height: 34px;
    display: inline-grid;
    place-items: center;
    padding: 0;
    color: var(--text-secondary);
    background: transparent;
    border-color: transparent;
}

.icon-button:hover,
.theme-toggle-auth:hover { background: var(--surface-hover); color: var(--text); }

.icon-moon { display: block; }
.icon-sun { display: none; }
html[data-theme="dark"] .icon-moon { display: none; }
html[data-theme="dark"] .icon-sun { display: block; }

button:focus-visible,
a:focus-visible,
input:focus-visible {
    outline: 3px solid var(--focus);
    outline-offset: 2px;
}

.app-main {
    width: min(1100px, calc(100% - 32px));
    margin: 0 auto;
    padding: 36px 0 56px;
}

.page-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 18px;
    margin-bottom: 18px;
}

.page-heading h1 {
    margin: 0;
    font-size: 24px;
    line-height: 1.25;
    letter-spacing: -.025em;
}

.page-heading p {
    margin: 4px 0 0;
    color: var(--text-muted);
    font-size: 13px;
}

.search-bar {
    min-height: 42px;
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto auto;
    align-items: center;
    gap: 8px;
    margin-bottom: 14px;
    padding: 4px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}

.search-icon { margin-left: 9px; color: var(--text-muted); }

.search-bar input {
    width: 100%;
    min-width: 0;
    height: 32px;
    padding: 0 4px;
    color: var(--text);
    background: transparent;
    border: 0;
    outline: 0;
}

.search-bar input::placeholder { color: var(--text-muted); }
.search-bar input:focus-visible { outline: 0; }

.clear-search {
    padding: 5px 7px;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
}
.clear-search:hover { background: var(--surface-hover); color: var(--text); }
.search-submit { min-height: 32px; }

.mail-panel {
    overflow: hidden;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}

.mail-row {
    min-height: 52px;
    display: grid;
    grid-template-columns: 12px minmax(150px, 220px) minmax(0, 1fr) 76px 18px;
    align-items: center;
    gap: 10px;
    padding: 0 14px;
    border-bottom: 1px solid var(--border-muted);
    color: var(--text-secondary);
}

.mail-row:last-child { border-bottom: 0; }
.mail-row:hover { background: var(--surface-hover); }
.mail-row:active { background: var(--surface-active); }

.unread-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: transparent;
}

.mail-row.unread .unread-dot { background: var(--accent); }
.mail-row.unread { color: var(--text); }
.mail-row.unread .sender-name,
.mail-row.unread .mail-subject { font-weight: 650; }

.mail-sender,
.mail-subject { min-width: 0; }
.sender-name,
.mail-subject span {
    display: block;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
}

.mail-subject { color: var(--text-secondary); }
.mail-row.unread .mail-subject { color: var(--text); }

.mail-row time {
    color: var(--text-muted);
    text-align: right;
    font-size: 12px;
    white-space: nowrap;
}

.chevron { color: var(--text-muted); width: 14px; height: 14px; }

.empty-state {
    min-height: 300px;
    padding: 56px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.empty-icon {
    width: 40px;
    height: 40px;
    display: grid;
    place-items: center;
    margin-bottom: 14px;
    color: var(--text-secondary);
    background: var(--surface-subtle);
    border: 1px solid var(--border-muted);
    border-radius: 50%;
}

.empty-icon .icon { width: 18px; height: 18px; }
.empty-state h2 { margin: 0; font-size: 15px; }
.empty-state p { margin: 5px 0 0; color: var(--text-muted); font-size: 13px; }

.pagination {
    min-height: 56px;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    margin-top: 12px;
}
.pagination > div:last-child { justify-self: end; }
.pagination > span { color: var(--text-muted); font-size: 12px; }

.status-panel {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    margin-bottom: 14px;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}
.status-panel strong,
.status-panel span { display: block; }
.status-panel span { margin-top: 2px; color: var(--text-secondary); font-size: 13px; }
.status-error { color: var(--danger); background: var(--danger-soft); border-color: color-mix(in srgb, var(--danger) 25%, var(--border)); }

/* Reader */
.reader-main {
    width: min(1000px, calc(100% - 32px));
    margin: 0 auto;
    padding: 22px 0 56px;
}

.reader-toolbar {
    min-height: 42px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 10px;
}

.message-appearance {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    padding: 3px;
    background: var(--surface-subtle);
    border: 1px solid var(--border-muted);
    border-radius: var(--radius);
}
.message-appearance > span {
    padding: 0 7px;
    color: var(--text-muted);
    font-size: 11px;
    font-weight: 650;
    text-transform: uppercase;
    letter-spacing: .04em;
}
.appearance-button {
    min-height: 28px;
    padding: 4px 9px;
    color: var(--text-secondary);
    background: transparent;
    border-color: transparent;
    font-size: 12px;
}
.appearance-button:hover { color: var(--text); }
.appearance-button.active {
    color: var(--text);
    background: var(--surface);
    border-color: var(--border);
}

.message-shell {
    overflow: hidden;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}

.message-header { padding: 26px 28px 20px; }
.message-header h1 {
    margin: 0 0 20px;
    font-size: clamp(21px, 3vw, 28px);
    line-height: 1.28;
    letter-spacing: -.025em;
}

.message-meta-row {
    display: grid;
    grid-template-columns: 36px minmax(0, 1fr) auto;
    align-items: center;
    gap: 10px;
}

.sender-avatar {
    width: 36px;
    height: 36px;
    display: grid;
    place-items: center;
    color: #fff;
    background: var(--accent);
    border-radius: 50%;
    font-size: 13px;
    font-weight: 750;
}

.message-meta { min-width: 0; }
.message-meta strong,
.message-meta span { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.message-meta strong { font-size: 13px; }
.message-meta span { color: var(--text-muted); font-size: 12px; }
.message-meta-row time { color: var(--text-muted); font-size: 12px; white-space: nowrap; }

.privacy-note {
    min-height: 38px;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 28px;
    color: var(--text-muted);
    background: var(--surface-subtle);
    border-top: 1px solid var(--border-muted);
    border-bottom: 1px solid var(--border-muted);
    font-size: 12px;
}
.privacy-note .icon { width: 14px; height: 14px; }

.email-canvas {
    padding: 22px;
    background: var(--reader-bg);
}

.email-frame {
    display: block;
    width: 100%;
    min-height: 420px;
    height: 720px;
    background: #fff;
    border: 1px solid rgba(140, 149, 159, .28);
    border-radius: var(--radius);
}

/* Authentication */
.auth-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 32px 20px;
    background: var(--bg);
}

.theme-toggle-auth {
    position: fixed;
    top: 18px;
    right: 18px;
}

.auth-shell { width: min(360px, 100%); }
.auth-card { width: 100%; }
.brand-auth { margin-bottom: 42px; }
.brand-auth .brand-mark { width: 30px; height: 30px; }

.auth-copy { margin-bottom: 24px; }
.auth-copy h1 {
    margin: 0;
    font-size: 24px;
    line-height: 1.25;
    letter-spacing: -.025em;
}
.auth-copy p { margin: 7px 0 0; color: var(--text-secondary); }

.auth-form { display: grid; gap: 8px; }
.auth-form label {
    margin-top: 6px;
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 650;
}
.auth-form input {
    width: 100%;
    height: 40px;
    padding: 0 11px;
    color: var(--text);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    outline: 0;
}
.auth-form input:hover { border-color: color-mix(in srgb, var(--border) 60%, var(--text-secondary)); }
.auth-form input:focus { border-color: #0969da; box-shadow: 0 0 0 3px var(--focus); }
.auth-form .button { margin-top: 10px; height: 40px; }

.auth-footnote {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    margin: 22px 0 0;
    color: var(--text-muted);
    font-size: 11px;
}
.auth-footnote .icon { width: 13px; height: 13px; }

.alert {
    display: flex;
    align-items: flex-start;
    gap: 9px;
    margin-bottom: 18px;
    padding: 10px 12px;
    color: var(--danger);
    background: var(--danger-soft);
    border: 1px solid color-mix(in srgb, var(--danger) 25%, var(--border));
    border-radius: var(--radius);
    font-size: 12px;
}

@media (max-width: 760px) {
    .app-header-inner { padding-inline: 14px; }
    .scope-badge { display: none; }
    .app-main, .reader-main { width: min(100% - 20px, 1100px); padding-top: 22px; }
    .mail-row {
        min-height: 64px;
        grid-template-columns: 10px minmax(0, 1fr) auto;
        grid-template-areas:
            "dot sender time"
            "dot subject time";
        gap: 0 8px;
        padding: 10px 12px;
    }
    .unread-dot { grid-area: dot; align-self: center; }
    .mail-sender { grid-area: sender; }
    .mail-subject { grid-area: subject; }
    .mail-row time { grid-area: time; align-self: start; }
    .chevron { display: none; }
    .sender-name, .mail-subject span { line-height: 1.5; }
    .page-heading h1 { font-size: 21px; }
    .reader-toolbar { align-items: flex-start; }
    .message-appearance > span { display: none; }
    .message-header { padding: 22px 18px 18px; }
    .message-meta-row { grid-template-columns: 34px minmax(0, 1fr); }
    .message-meta-row time { grid-column: 2; margin-top: -2px; }
    .privacy-note { padding-inline: 18px; }
    .email-canvas { padding: 10px; }
}

@media (max-width: 520px) {
    .brand span { display: none; }
    .header-actions { gap: 3px; }
    .search-bar { grid-template-columns: auto minmax(0, 1fr) auto; }
    .search-submit { display: none; }
    .clear-search { grid-column: 3; }
    .pagination { grid-template-columns: 1fr 1fr; gap: 8px; }
    .pagination > span { display: none; }
    .pagination .button { width: 100%; }
    .reader-toolbar { flex-wrap: wrap; }
    .message-appearance { margin-left: auto; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}

/* Match the isolated message canvas to the application theme immediately,
   preventing a white flash while the iframe reloads on theme changes. */
html[data-theme="dark"] .email-frame {
    background: #0d1117;
    border-color: #30363d;
}