:root {
    --ink: #1d2433;
    --muted: #5f6b7a;
    --bg: #f5f6fa;
    --card: #ffffff;
    --line: #dfe3ea;
    --brand: #243b6b;
    --brand-soft: #eef2fb;
    --ok: #1f7a4d;
    --ok-bg: #e6f4ec;
    --bad: #b3261e;
    --bad-bg: #fdecea;
    --warn-bg: #fff4d6;
    --radius: 12px;
}

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

body {
    margin: 0;
    font: 17px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    color: var(--ink);
    background: var(--bg);
}

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

.topbar {
    display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
    gap: .5rem 1rem; padding: .75rem 1rem; background: var(--brand); color: #fff;
}
.topbar a, .topbar .link-button { color: #fff; text-decoration: none; }
.brand { font-weight: 700; }
.nav { display: flex; flex-wrap: wrap; align-items: center; gap: .25rem 1rem; }
.nav a:hover, .link-button:hover { text-decoration: underline; }
.inline { display: inline; margin: 0; }
.link-button { background: none; border: 0; padding: 0; font: inherit; cursor: pointer; }

.page { max-width: 960px; margin: 0 auto; padding: 1rem; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.25rem; margin-bottom: 1rem; }
.narrow { max-width: 460px; }
.card.narrow { margin-inline: auto; }

h1 { font-size: 1.6rem; margin: 0 0 .5rem; }
h2 { font-size: 1.2rem; margin: 1.5rem 0 .5rem; }
h3 { font-size: 1rem; margin: 0; }
.eyebrow { text-transform: uppercase; letter-spacing: .04em; font-size: .8rem; color: var(--muted); margin: 0 0 .25rem; }
.muted { color: var(--muted); font-weight: normal; }

.stack { display: grid; gap: .75rem; }
label { display: grid; gap: .25rem; font-weight: 600; }
input, select {
    font: inherit; width: 100%; padding: .6rem .7rem; color: var(--ink); background: #fff;
    border: 1px solid var(--line); border-radius: 8px;
}
input:focus, select:focus { outline: 3px solid #b9c8ea; border-color: var(--brand); }

.button {
    display: inline-block; padding: .65rem 1.1rem; border: 0; border-radius: 8px;
    background: var(--brand); color: #fff; font: inherit; font-weight: 600;
    text-align: center; text-decoration: none; cursor: pointer;
}
.button.secondary { background: #e8ecf5; color: var(--brand); }
.button.danger { background: var(--bad); }
.button.small { padding: .4rem .8rem; font-size: .9rem; }
.button:disabled { opacity: .6; cursor: wait; }

.flash { margin: 0 0 1rem; padding: .6rem .8rem; border-radius: 8px; background: var(--brand-soft); }
.flash-success { background: var(--ok-bg); color: var(--ok); }
.flash-error { background: var(--bad-bg); color: var(--bad); }
.flash-warning { background: var(--warn-bg); color: var(--ink); }
.badge { display: inline-block; padding: .1rem .55rem; border-radius: 999px; background: var(--warn-bg); font-size: .85rem; font-weight: 600; }
progress { width: 100%; height: 12px; accent-color: var(--brand); }

.prompt { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .5rem; margin: 1rem 0; }
.prompt div { background: var(--brand-soft); border-radius: 10px; padding: .6rem .8rem; }
.prompt dt { font-size: .8rem; color: var(--muted); }
.prompt dd { margin: 0; font-size: 1.25rem; font-weight: 700; }
.statement { font-size: 1.5rem; font-weight: 700; margin: .5rem 0; }
.practice input { font-size: 1.2rem; }
input.is-correct { border-color: var(--ok); background: var(--ok-bg); }
input.is-wrong { border-color: var(--bad); background: var(--bad-bg); }
.feedback, .result { margin: -.25rem 0 0; font-weight: 600; }
.feedback.ok, .result.ok { color: var(--ok); }
.feedback.bad, .result.bad { color: var(--bad); }

.tense-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: .4rem; }
.tense-list li { display: flex; justify-content: space-between; padding: .45rem .7rem; border: 1px solid var(--line); border-radius: 8px; }
.tense-list li.started { background: var(--brand-soft); }
.tense-list li.done { background: var(--ok-bg); color: var(--ok); }

.verb-grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); gap: .35rem; }
.verb-grid li { padding: .35rem .5rem; border: 1px solid var(--line); border-radius: 6px; font-size: .9rem; color: var(--muted); }
.verb-grid li.started { background: var(--brand-soft); color: var(--ink); }
.verb-grid li.done { background: var(--ok-bg); color: var(--ok); border-color: transparent; }
.verb-grid li.current { background: var(--brand); color: #fff; border-color: transparent; font-weight: 700; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .95rem; }
th, td { text-align: left; vertical-align: top; padding: .5rem; border-bottom: 1px solid var(--line); }
tr.wrong td { background: var(--bad-bg); }
tr.inactive td { opacity: .6; }

.row-between { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: .5rem; }
.search-row, .forms-row { display: flex; flex-wrap: wrap; align-items: end; gap: .5rem; }
.search-row label { flex: 1 1 200px; }
.forms-row label { flex: 1 1 110px; }
details summary { cursor: pointer; color: var(--brand); }
.card > form + form { margin-top: 1.5rem; }
.danger-zone { border-top: 1px solid var(--line); padding-top: 1rem; }

@media (max-width: 520px) {
    .prompt { grid-template-columns: 1fr; }
    h1 { font-size: 1.35rem; }
}