:root {
    color-scheme: light dark;

    --paper: #eef1ef;
    --surface: #ffffff;
    --surface-sunken: #f6f8f6;
    --ink: #101716;
    --muted: #5f6b68;
    --faint: #8b9793;
    --rule: #dbe2de;
    --signal: #0b5d4e;
    --signal-soft: #dceee7;
    --alert: #9c3620;
    --alert-soft: #f7e3dd;

    --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
    --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

    --radius: 5px;
    --gutter: 4.5rem;
}

@media (prefers-color-scheme: dark) {
    :root {
        --paper: #0e1312;
        --surface: #151b1a;
        --surface-sunken: #111716;
        --ink: #e4ebe8;
        --muted: #8ea09a;
        --faint: #6b7a75;
        --rule: #242e2c;
        --signal: #58d3b2;
        --signal-soft: #16302a;
        --alert: #e58468;
        --alert-soft: #33201a;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--sans);
    font-size: 15px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--signal); }

.shell {
    max-width: 74rem;
    margin: 0 auto;
    padding: 1.5rem 1.25rem 4rem;
}

/* ---- masthead ---------------------------------------------------------- */

.masthead {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.75rem 1.25rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--rule);
}

.wordmark {
    font-family: var(--mono);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--muted);
    text-decoration: none;
}

.wordmark strong { color: var(--ink); font-weight: 600; }

.masthead-spacer { flex: 1; }

.masthead-logout { margin: 0; }

/* ---- steppers ---------------------------------------------------------- */

.datebar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.datebar-day {
    font-family: var(--mono);
    font-size: 1.35rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    font-variant-numeric: tabular-nums;
}

.step {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    border: 1px solid var(--rule);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--ink);
    text-decoration: none;
    font-size: 0.95rem;
}

.step:hover { border-color: var(--signal); color: var(--signal); }

.step[aria-disabled="true"] {
    color: var(--faint);
    background: transparent;
    pointer-events: none;
}

/* ---- notices ----------------------------------------------------------- */

.notice {
    margin: 1.25rem 0 0;
    padding: 0.65rem 0.85rem;
    border-radius: var(--radius);
    background: var(--signal-soft);
    color: var(--ink);
    font-size: 0.875rem;
}

.notice-mono { font-family: var(--mono); }

.notice.is-alert { background: var(--alert-soft); }

/* ---- ledger ------------------------------------------------------------ */

.ledger { margin-top: 1.75rem; }

.day + .day { margin-top: 2.25rem; }

.day-mark {
    position: sticky;
    top: 0;
    z-index: 1;
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.15rem 0.75rem;
    margin: 0;
    padding: 0.6rem 0 0.5rem;
    background: var(--paper);
    border-bottom: 2px solid var(--rule);
    font-size: 0.95rem;
    font-weight: 600;
}

.day-date {
    font-family: var(--mono);
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    color: var(--faint);
}

.day-count {
    margin-left: auto;
    font-family: var(--mono);
    font-size: 0.68rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--faint);
}

.mail {
    display: grid;
    grid-template-columns: var(--gutter) 1fr auto;
    align-items: baseline;
    gap: 0 1rem;
    padding: 0.55rem 0.75rem 0.55rem 0;
    text-decoration: none;
    color: inherit;
    border-bottom: 1px solid var(--rule);
}

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

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

.mail-time {
    font-family: var(--mono);
    font-variant-numeric: tabular-nums;
    font-size: 0.875rem;
    color: var(--muted);
    text-align: right;
}

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

.mail-subject[data-state="pending"] { color: var(--faint); }

.mail-recipient {
    display: block;
    font-family: var(--mono);
    font-size: 0.78rem;
    color: var(--faint);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.mail-size {
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--faint);
    font-variant-numeric: tabular-nums;
}

.ledger-foot {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 1.75rem;
    padding-top: 0.9rem;
    border-top: 1px solid var(--rule);
    font-family: var(--mono);
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--faint);
}

/* ---- pager ------------------------------------------------------------- */

.pager {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.pager-count {
    font-family: var(--mono);
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
    font-variant-numeric: tabular-nums;
}

/* ---- blank states ------------------------------------------------------ */

.blank {
    margin-top: 3rem;
    padding: 2.5rem 1.5rem;
    border: 1px dashed var(--rule);
    border-radius: var(--radius);
    text-align: center;
    color: var(--muted);
}

.blank h1 {
    margin: 0 0 0.5rem;
    font-size: 1.05rem;
    color: var(--ink);
}

.blank p { margin: 0.25rem 0; font-size: 0.9rem; }

.blank code {
    font-family: var(--mono);
    font-size: 0.82rem;
    color: var(--ink);
}

/* ---- login ------------------------------------------------------------- */

.login {
    max-width: 22rem;
    margin: 4rem auto 0;
    padding: 1.75rem 1.5rem;
    border: 1px solid var(--rule);
    border-radius: var(--radius);
    background: var(--surface);
}

.login h1 {
    margin: 0 0 1.25rem;
    font-size: 1.05rem;
}

.login-error {
    margin: 0 0 1rem;
    padding: 0.55rem 0.75rem;
    border-radius: var(--radius);
    background: var(--alert-soft);
    color: var(--ink);
    font-size: 0.875rem;
}

.login-label {
    display: block;
    margin-bottom: 0.3rem;
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--muted);
}

.login-field {
    width: 100%;
    margin-bottom: 1rem;
    padding: 0.45rem 0.6rem;
    border: 1px solid var(--rule);
    border-radius: var(--radius);
    background: var(--surface-sunken);
    color: var(--ink);
    font: inherit;
    font-size: 0.9rem;
}

.login-field:focus-visible {
    outline: 2px solid var(--signal);
    outline-offset: -1px;
}

.login .button { width: 100%; padding: 0.5rem 0.75rem; }

/* ---- message ----------------------------------------------------------- */

.message { margin-top: 1.75rem; }

.message-subject {
    margin: 0 0 1rem;
    font-size: 1.4rem;
    line-height: 1.25;
    font-weight: 600;
    letter-spacing: -0.015em;
}

.fields {
    display: grid;
    grid-template-columns: 7rem 1fr;
    gap: 0.3rem 1rem;
    margin: 0 0 1.5rem;
    padding: 0 0 1.25rem;
    border-bottom: 1px solid var(--rule);
    font-size: 0.875rem;
}

.fields dt {
    font-family: var(--mono);
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--faint);
    text-align: right;
    padding-top: 0.15rem;
}

.fields dd {
    margin: 0;
    font-family: var(--mono);
    font-size: 0.82rem;
    overflow-wrap: anywhere;
}

.field-local {
    margin-left: 0.6rem;
    color: var(--faint);
}

.actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

.button {
    font: inherit;
    font-size: 0.82rem;
    padding: 0.35rem 0.75rem;
    border: 1px solid var(--rule);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--ink);
    text-decoration: none;
    cursor: pointer;
}

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

.button.is-danger { color: var(--alert); }

.button.is-danger:hover { border-color: var(--alert); color: var(--alert); }

.button.is-solid-danger {
    background: var(--alert);
    border-color: var(--alert);
    color: #fff;
}

.button.is-solid-danger:hover { color: #fff; opacity: 0.9; }

.confirm {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
    padding: 0.75rem 0.9rem;
    border: 1px solid var(--alert);
    border-radius: var(--radius);
    background: var(--alert-soft);
    font-size: 0.875rem;
}

.confirm form { margin: 0; }

.attachments {
    margin: 0 0 1.25rem;
    padding: 0;
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.attachments a {
    display: inline-flex;
    align-items: baseline;
    gap: 0.5rem;
    padding: 0.35rem 0.7rem;
    border: 1px solid var(--rule);
    border-radius: var(--radius);
    background: var(--surface);
    text-decoration: none;
    color: var(--ink);
    font-size: 0.82rem;
}

.attachments a:hover { border-color: var(--signal); }

.attachments em {
    font-family: var(--mono);
    font-style: normal;
    font-size: 0.72rem;
    color: var(--faint);
}

.label {
    font-family: var(--mono);
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--faint);
    margin: 0 0 0.5rem;
}

.body-frame {
    width: 100%;
    min-height: 7.5rem;
    border: 1px solid var(--rule);
    border-radius: var(--radius);
    background: #fff;
}

@media (max-width: 640px) {
    :root { --gutter: 3.75rem; }

    .mail { grid-template-columns: var(--gutter) 1fr; }

    .mail-size { display: none; }

    .day-count { margin-left: 0; }

    .fields { grid-template-columns: 1fr; }

    .fields dt { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
    * { transition: none !important; animation: none !important; }
}