:root {
    color-scheme: dark;
    font-family: Tahoma, Arial, sans-serif;
    color: #f0f3f7;
    background: #10151d;
    --panel: #1a222e;
    --field: #131b27;
    --line: #354257;
    --muted: #b4bfce;
    --accent: #a5d993;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
    margin: 0;
    min-height: 100vh;
    padding: max(14px, env(safe-area-inset-top)) 12px max(20px, env(safe-area-inset-bottom));
}

.panel {
    max-width: 600px;
    margin: 12px auto;
    padding: clamp(16px, 4vw, 28px);
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 16px;
}

.heading, .footer, .date-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.heading, .footer { justify-content: space-between; }
.heading { margin-bottom: 20px; }
h1 { margin: 0; font-size: clamp(20px, 5vw, 26px); }
h2 { margin: 0; font-size: 17px; line-height: 1.6; }
form { display: grid; gap: 17px; }
label { display: block; color: #d5deea; font-size: 14px; line-height: 1.65; }
.row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.dates { grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); }

input, select, button { font: inherit; }
input:not([type=checkbox]), select {
    display: block;
    width: 100%;
    min-width: 0;
    min-height: 46px;
    margin-top: 5px;
    padding: 9px 10px;
    border: 1px solid var(--line);
    border-radius: 9px;
    background: var(--field);
    color: #f0f3f7;
    font-size: 16px;
}

input::placeholder, .muted { color: var(--muted); }
input[type=checkbox] { accent-color: var(--accent); inline-size: 20px; block-size: 20px; }
button { min-height: 44px; padding: 7px 13px; border-radius: 9px; cursor: pointer; }
button:disabled { opacity: .65; cursor: wait; }
button.quiet { color: #d5deea; background: #253041; border: 1px solid var(--line); }
button.primary { color: #14200f; background: var(--accent); border: 1px solid var(--accent); font-weight: bold; }
:focus-visible { outline: 2px solid #a5d993; outline-offset: 3px; }

.notice, .operation {
    padding: 10px 12px;
    border: 1px solid var(--line);
    border-radius: 9px;
    line-height: 1.8;
    font-size: 14px;
    color: #dce4ef;
}

.notice[data-error=true] { border-color: #a36a66; color: #ffd1cc; }
.operation { margin-top: 17px; }
.operation p { margin-top: 0; }
.latest, .date-actions { margin-top: 7px; font-size: 13px; }
.footer { padding-top: 14px; border-top: 1px solid var(--line); }
.confirm { display: inline-flex; align-items: center; gap: 6px; min-height: 44px; }
dialog { max-width: min(420px, calc(100% - 24px)); padding: 18px; color: inherit; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; }
dialog::backdrop { background: rgb(0 0 0 / 70%); }
@media (max-width: 360px) {
    .row { grid-template-columns: minmax(0, 1fr); }
}