/* UniFi Nerds Training — minimal, modern, neutral. */
:root {
    --bg: #f6f7fb;
    --surface: #ffffff;
    --border: #e3e6ee;
    --ink: #1a1f2e;
    --muted: #5d6679;
    --accent: #0a66ff;
    --accent-ink: #ffffff;
    --ok: #1f8a4c;
    --ok-bg: #e6f5ec;
    --err: #b3261e;
    --err-bg: #fce9e7;
    --warn: #8a6d1f;
    --warn-bg: #fbf2d6;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    background: var(--bg);
    color: var(--ink);
    font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { line-height: 1.25; margin: 1.4em 0 .5em; }
h1 { font-size: 1.85rem; margin-top: .2em; }
h2 { font-size: 1.4rem; }
h3 { font-size: 1.15rem; color: #2a3247; }
p { margin: .6em 0; }
hr { border: none; border-top: 1px solid var(--border); margin: 2em 0; }

/* Topbar */
.topbar {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    display: flex; align-items: center; justify-content: space-between;
    padding: 14px 24px;
    position: sticky; top: 0; z-index: 10;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand-mark {
    background: var(--ink); color: #fff;
    font-weight: 700; letter-spacing: .5px;
    padding: 4px 8px; border-radius: 6px; font-size: 13px;
}
.brand-text { font-weight: 600; }
.topnav { display: flex; align-items: center; gap: 18px; }
.topnav a { color: var(--muted); font-weight: 500; }
.topnav a.active, .topnav a:hover { color: var(--ink); text-decoration: none; }
.topnav .who { color: var(--muted); font-size: 14px; }
.logout-form { display: inline; margin: 0; }
.linkish {
    background: none; border: none; color: var(--muted); font: inherit;
    cursor: pointer; padding: 0;
}
.linkish:hover { color: var(--ink); }

/* Layout */
.container {
    max-width: 1080px; margin: 0 auto; padding: 32px 24px;
}

/* Cards & alerts */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 22px 24px;
    margin: 18px 0;
}
.alert {
    padding: 12px 16px; border-radius: 8px; margin: 12px 0;
    border: 1px solid;
}
.alert.ok  { background: var(--ok-bg);  color: var(--ok);  border-color: #c6e7d3; }
.alert.err { background: var(--err-bg); color: var(--err); border-color: #f5c6c2; }
.alert.warn{ background: var(--warn-bg);color: var(--warn);border-color: #ecdc9b; }

/* Forms */
.form-row { display: block; margin: 14px 0; }
.form-row label { display: block; font-size: 14px; color: var(--muted); margin-bottom: 6px; }
.form-row input, .form-row textarea, .form-row select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 7px;
    background: #fff; color: var(--ink);
    font: inherit;
}
.form-row input:focus, .form-row textarea:focus, .form-row select:focus {
    outline: none; border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(10,102,255,0.12);
}
.btn {
    display: inline-block;
    background: var(--accent); color: var(--accent-ink);
    border: none; border-radius: 7px;
    padding: 10px 18px; font: inherit; font-weight: 600;
    cursor: pointer; text-decoration: none;
}
.btn:hover { background: #084fcc; text-decoration: none; }
.btn.secondary { background: #eef1f8; color: var(--ink); }
.btn.secondary:hover { background: #e2e7f1; }
.btn.danger { background: var(--err); }
.btn.danger:hover { background: #8c1d17; }
.btn:disabled, .btn[disabled] { opacity: .5; cursor: not-allowed; }

/* Dashboard — product sections w/ level grid */
.dash-grid {
    display: grid; gap: 20px;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    margin: 24px 0;
}
.course-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 22px;
    display: flex; flex-direction: column;
}
.course-card h2 { margin-top: 0; font-size: 1.25rem; }
.course-card .summary { color: var(--muted); flex-grow: 1; }
.course-card .meta { color: var(--muted); font-size: 13px; margin: 10px 0 14px; }

.product-section { margin: 28px 0 12px; }
.product-header {
    display: flex; align-items: baseline; gap: 16px;
    margin: 0 0 14px; padding: 0 4px;
    border-bottom: 1px solid var(--border); padding-bottom: 10px;
}
.product-header h2 { margin: 0; font-size: 1.4rem; }
.product-blurb { color: var(--muted); font-size: 14px; }

.level-grid {
    display: grid; gap: 16px;
    grid-template-columns: repeat(3, 1fr);
}
@media (max-width: 800px) { .level-grid { grid-template-columns: 1fr; } }

.level-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 18px 20px;
    display: flex; flex-direction: column;
    position: relative;
}
.level-card h3 {
    margin: 6px 0 6px; font-size: 1.05rem;
}
.level-card .summary {
    color: var(--muted); font-size: 14px; flex-grow: 1;
}
.level-card .progress { margin: 12px 0 6px; }
.level-card .progress-text { font-size: 12px; color: var(--muted); margin-bottom: 12px; }
.level-card .level-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.level-card .level-actions .btn { padding: 8px 14px; font-size: 14px; }
.level-tag {
    align-self: flex-start;
    text-transform: uppercase; font-size: 11px; letter-spacing: 1px;
    font-weight: 700;
    padding: 3px 8px; border-radius: 99px;
    background: #eef1f8; color: var(--muted);
}
.level-card.level-beginner .level-tag    { background: #e6f5ec; color: var(--ok); }
.level-card.level-intermediate .level-tag { background: #e7eefe; color: var(--accent); }
.level-card.level-advanced .level-tag    { background: #fbf2d6; color: var(--warn); }
.level-card.level-beginner    { border-top: 3px solid #c6e7d3; }
.level-card.level-intermediate { border-top: 3px solid #bcd0fb; }
.level-card.level-advanced    { border-top: 3px solid #ecdc9b; }
.progress {
    height: 8px; background: #e8ebf3; border-radius: 99px; overflow: hidden;
    margin: 8px 0 4px;
}
.progress > span {
    display: block; height: 100%;
    background: var(--accent);
    transition: width .3s ease;
}
.progress-text { font-size: 13px; color: var(--muted); }
.badge {
    display: inline-block; padding: 2px 8px; border-radius: 99px;
    font-size: 12px; font-weight: 600;
}
.badge.ok { background: var(--ok-bg); color: var(--ok); }
.badge.warn { background: var(--warn-bg); color: var(--warn); }
.badge.muted { background: #eef1f8; color: var(--muted); }

/* Lesson layout */
.lesson-layout {
    display: grid; gap: 24px;
    grid-template-columns: 260px 1fr;
}
@media (max-width: 800px) {
    .lesson-layout { grid-template-columns: 1fr; }
}
.lesson-sidebar {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 14px;
    align-self: start;
}
.lesson-sidebar h3 { font-size: 14px; text-transform: uppercase; letter-spacing: .5px; color: var(--muted); margin-top: 0; }
.lesson-sidebar ol { list-style: none; padding: 0; margin: 0; counter-reset: chap; }
.lesson-sidebar li { margin: 2px 0; }
.lesson-sidebar a {
    display: block; padding: 7px 10px; border-radius: 6px;
    color: var(--ink); font-size: 14px;
}
.lesson-sidebar a:hover { background: #eef1f8; text-decoration: none; }
.lesson-sidebar a.current { background: var(--ink); color: #fff; }
.lesson-sidebar a .chk { color: var(--ok); margin-right: 6px; }
.lesson-sidebar a.current .chk { color: #9ad9b0; }
.lesson-sidebar a .num { display: inline-block; width: 22px; color: var(--muted); }
.lesson-sidebar a.current .num { color: #cfd5e6; }
.lesson-sidebar .sb-quiz a {
    border-top: 1px solid var(--border); margin-top: 8px; padding-top: 12px;
    font-weight: 600;
}

.lesson-body {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 32px 36px;
}
.lesson-body h1:first-child { margin-top: 0; }
.lesson-body table.lesson-table {
    border-collapse: collapse;
    width: 100%;
    margin: 16px 0;
    font-size: 14px;
}
.lesson-table th, .lesson-table td {
    border: 1px solid var(--border);
    padding: 8px 10px;
    vertical-align: top;
    text-align: left;
}
.lesson-table th { background: #eef1f8; font-weight: 600; }
.lesson-body ul, .lesson-body ol { padding-left: 22px; }
.lesson-body li { margin: 4px 0; }
.lesson-nav {
    display: flex; justify-content: space-between; gap: 12px;
    margin-top: 32px; padding-top: 18px;
    border-top: 1px solid var(--border);
}
.lesson-nav .placeholder { visibility: hidden; }

/* Quiz */
.quiz-question {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px 22px;
    margin: 16px 0;
}
.quiz-question .prompt { font-weight: 600; }
.choices { list-style: none; padding: 0; margin: 10px 0; }
.choices li { margin: 6px 0; }
.choices label {
    display: flex; align-items: flex-start; gap: 10px;
    padding: 10px 12px; border: 1px solid var(--border); border-radius: 7px;
    cursor: pointer;
}
.choices label:hover { background: #f0f3fa; }
.choices input { margin-top: 4px; }
.choices label.correct { background: var(--ok-bg); border-color: #c6e7d3; }
.choices label.incorrect { background: var(--err-bg); border-color: #f5c6c2; }
.quiz-question .explanation {
    margin-top: 10px; padding: 10px 12px; background: #eef1f8;
    border-radius: 6px; color: var(--muted); font-size: 14px;
}
.score-summary {
    text-align: center;
    padding: 32px;
}
.score-summary .score {
    font-size: 3rem; font-weight: 700; line-height: 1;
    color: var(--accent);
}
.score-summary.passed .score { color: var(--ok); }
.score-summary.failed .score { color: var(--err); }
.score-summary .verdict { font-size: 1.1rem; color: var(--muted); margin: 8px 0 20px; }

/* Admin progress chips — 3 levels per product column */
.progress-table { font-size: 13px; }
.progress-table th.prod-col, .progress-table td.prod-col { min-width: 140px; }
.level-chips { display: flex; gap: 4px; }
.chip {
    display: flex; flex-direction: column; align-items: stretch;
    min-width: 40px; padding: 3px 5px; border-radius: 6px;
    border: 1px solid var(--border);
    background: #f6f7fb;
    font-size: 11px;
    line-height: 1.1;
}
.chip-letter { font-weight: 700; color: var(--muted); }
.chip-score  { color: var(--ink); margin-top: 1px; font-weight: 600; }
.chip-bar {
    display: block; height: 3px; margin-top: 3px;
    background: #e8ebf3; border-radius: 2px; overflow: hidden;
}
.chip-bar > span { display: block; height: 100%; background: var(--muted); }
.chip.pass { background: var(--ok-bg); border-color: #c6e7d3; }
.chip.pass .chip-letter, .chip.pass .chip-score { color: var(--ok); }
.chip.pass .chip-bar > span { background: var(--ok); }
.chip.attempt { background: var(--warn-bg); border-color: #ecdc9b; }
.chip.attempt .chip-letter, .chip.attempt .chip-score { color: var(--warn); }
.chip.attempt .chip-bar > span { background: var(--warn); }
.chip.none { background: #eef1f8; color: var(--muted); }

/* Tables in admin */
table.data {
    width: 100%; border-collapse: collapse;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    font-size: 14px;
}
table.data th, table.data td {
    padding: 10px 14px; text-align: left; vertical-align: middle;
    border-bottom: 1px solid var(--border);
}
table.data th { background: #eef1f8; font-weight: 600; color: var(--muted); }
table.data tr:last-child td { border-bottom: none; }
.code {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    background: #f0f3fa; padding: 2px 6px; border-radius: 4px; font-size: 13px;
}

.sitefoot { text-align: center; padding: 30px; color: var(--muted); font-size: 13px; }

/* Auth pages */
.auth-wrap {
    max-width: 420px; margin: 60px auto;
}
.auth-wrap .card { padding: 28px; }
.auth-wrap h1 { margin-top: 0; }
.auth-wrap .hint { color: var(--muted); font-size: 14px; }

/* Final-exam celebration */
.cert {
    background: linear-gradient(135deg, #f9f9ff 0%, #eef3ff 100%);
    border: 2px solid var(--accent);
    border-radius: 14px;
    padding: 38px; text-align: center;
}
.cert h2 { margin-top: 0; }
.cert .who { font-size: 1.6rem; font-weight: 700; margin: 8px 0; }
.cert .stamp { color: var(--muted); font-size: 13px; letter-spacing: 1px; text-transform: uppercase; margin-top: 14px; }