:root {
    color-scheme: light;
    --bg: #f4faff;
    --surface: #ffffff;
    --surface-soft: #f8fcff;
    --surface-strong: #eaf5fc;
    --text: #18344d;
    --muted: #6d8294;
    --line: #d9eaf5;
    --primary: #39a9e8;
    --primary-strong: #147bb7;
    --primary-soft: #e3f4ff;
    --accent: #e6a23a;
    --accent-soft: #fff5df;
    --danger: #c84f5a;
    --danger-soft: #fff0f2;
    --warning: #986616;
    --warning-soft: #fff7df;
    --success: #2d9d78;
    --success-soft: #e8f8f2;
    --shadow: 0 10px 28px rgba(39, 112, 158, .08);
    --radius: 16px;
    --radius-sm: 12px;
    --max: 1480px;
    --tap: 48px;
    --font: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { min-height: 100%; scroll-behavior: smooth; }
body {
    min-height: 100%;
    margin: 0;
    background: linear-gradient(180deg, #fbfdff 0%, var(--bg) 100%);
    color: var(--text);
    font-family: var(--font);
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: none; }
img { max-width: 100%; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: .5rem; font-size: clamp(1.65rem, 6vw, 2.55rem); line-height: 1.08; letter-spacing: -.035em; }
h2 { margin-bottom: .35rem; font-size: 1.17rem; line-height: 1.25; }
h3 { margin-bottom: .3rem; font-size: 1rem; }
p { margin-bottom: .8rem; }
small { font-size: .78rem; color: var(--muted); }
code { padding: .1rem .35rem; border-radius: 6px; background: var(--surface-strong); color: var(--text); overflow-wrap: anywhere; }

.app-shell { min-height: 100vh; }
.main-column { min-width: 0; }
.main-content {
    width: min(100%, var(--max));
    margin: 0 auto;
    padding: 1rem 1rem calc(6.6rem + env(safe-area-inset-bottom));
}
.sidebar { display: none; }
.topbar {
    position: sticky;
    top: 0;
    z-index: 40;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 60px;
    padding: .55rem 1rem;
    border-bottom: 1px solid rgba(217, 234, 245, .92);
    background: color-mix(in srgb, var(--bg) 90%, transparent);
    backdrop-filter: blur(18px);
}
.mobile-brand, .topbar-user { display: flex; align-items: center; gap: .65rem; color: var(--text); }
.topbar-user { font-size: .88rem; }
.topbar-user a { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 50%; background: var(--surface); color: var(--text); }
.brand-mark {
    display: grid;
    place-items: center;
    width: 46px;
    height: 46px;
    border-radius: 14px;
    background: linear-gradient(145deg, var(--primary), var(--primary-strong));
    color: white;
    font-weight: 900;
    letter-spacing: -.06em;
    box-shadow: 0 8px 22px rgba(20, 123, 183, .20);
}
.brand-mark.small { width: 36px; height: 36px; border-radius: 11px; font-size: .86rem; }
.brand-mark.hero { width: 72px; height: 72px; margin: 0 auto 1rem; border-radius: 22px; font-size: 1.45rem; }
.brand { display: flex; align-items: center; gap: .8rem; color: var(--text); }
.brand span:last-child { display: grid; }
.brand small { margin-top: -.1rem; text-transform: capitalize; }

.bottom-nav {
    position: fixed;
    z-index: 60;
    right: 0;
    bottom: 0;
    left: 0;
    display: grid;
    grid-template-columns: repeat(var(--nav-count, 5), minmax(0, 1fr));
    min-height: 68px;
    padding: .35rem .35rem calc(.35rem + env(safe-area-inset-bottom));
    border-top: 1px solid var(--line);
    background: color-mix(in srgb, var(--surface) 94%, transparent);
    backdrop-filter: blur(18px);
    box-shadow: 0 -10px 30px rgba(39, 112, 158, .08);
}
.bottom-link {
    display: grid;
    place-items: center;
    align-content: center;
    min-width: 0;
    min-height: 58px;
    gap: .05rem;
    border-radius: 12px;
    color: var(--muted);
}
.bottom-link > span { font-size: 1.22rem; line-height: 1; }
.bottom-link small { max-width: 100%; overflow: hidden; color: inherit; font-size: .67rem; text-overflow: ellipsis; white-space: nowrap; }
.bottom-link.active { background: var(--primary-soft); color: var(--primary-strong); font-weight: 800; }

.guest-shell, .installer-shell {
    display: grid;
    min-height: 100vh;
    place-items: center;
    padding: 1rem;
    background:
        radial-gradient(circle at 15% 5%, rgba(57, 169, 232, .17), transparent 34%),
        radial-gradient(circle at 90% 95%, rgba(124, 205, 244, .14), transparent 32%),
        var(--bg);
}
.installer-shell { place-items: start center; padding-block: 2rem; }
.login-card { width: min(100%, 440px); padding: 1.35rem; text-align: center; }
.login-card .stack-form { margin-top: 1.2rem; text-align: left; }
.demo-note { margin-top: 1.1rem; padding: 1rem; border-radius: var(--radius-sm); background: var(--surface-soft); text-align: left; }
.demo-note p { margin: .35rem 0; }
.installer-card { width: min(100%, 760px); padding: clamp(1.1rem, 4vw, 2rem); }
.installer-card > .brand-mark { margin-bottom: 1rem; }

.card {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: var(--shadow);
}
.narrow-card { width: min(100%, 680px); padding: 1rem; }
.form-card { width: min(100%, 940px); padding: 1rem; }
.sticky-card { align-self: start; }

.page-heading {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    margin: .35rem 0 1rem;
}
.page-heading p { margin-bottom: 0; color: var(--muted); }
.eyebrow { margin-bottom: .25rem; color: var(--primary); font-size: .72rem; font-weight: 900; letter-spacing: .12em; text-transform: uppercase; }
.muted { color: var(--muted); }
.small-copy { font-size: .85rem; }
.heading-actions { display: flex; flex-wrap: wrap; gap: .6rem; }
.heading-actions.centered { justify-content: center; }
.section-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem; margin-bottom: .9rem; }
.section-heading p { margin: 0; color: var(--muted); font-size: .86rem; }
.section-heading > strong { color: var(--primary); }

.button {
    display: inline-flex;
    min-height: var(--tap);
    align-items: center;
    justify-content: center;
    gap: .45rem;
    padding: .7rem 1rem;
    border: 1px solid transparent;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    line-height: 1;
    cursor: pointer;
    box-shadow: 0 8px 18px rgba(57, 169, 232, .18);
}
.button:hover, .button:focus-visible { background: var(--primary-strong); }
.button.secondary { border-color: var(--line); background: var(--surface-soft); color: var(--text); box-shadow: none; }
.button.ghost { border-color: transparent; background: transparent; color: var(--primary); box-shadow: none; }
.button.wide { width: 100%; }
.button:disabled { opacity: .45; cursor: not-allowed; box-shadow: none; }
.icon-button { min-width: var(--tap); padding-inline: .5rem; font-size: 1.2rem; }
.link-button, .mini-link, .icon-danger {
    padding: 0;
    border: 0;
    background: transparent;
    color: var(--primary);
    font: inherit;
    cursor: pointer;
}
.icon-danger { display: grid; width: 40px; height: 40px; place-items: center; border-radius: 50%; color: var(--danger); font-size: 1.4rem; }
.text-link { color: var(--primary); font-size: .82rem; }

.alert { margin-bottom: 1rem; padding: .85rem 1rem; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--surface); }
.alert.success { border-color: #a8ddc6; background: var(--success-soft); color: #0e543a; }
.alert.danger { border-color: #e9b4b4; background: var(--danger-soft); color: #7a2323; }
.alert.warning { border-color: #e6cd88; background: var(--warning-soft); color: #60470d; }
.alert ul { margin-bottom: 0; padding-left: 1.2rem; }
.credential-box { padding: .8rem; border: 1px dashed currentColor; border-radius: 10px; font-size: 1.1rem; text-align: center; }

.stack-form { display: grid; gap: .9rem; }
.compact-form { gap: .7rem; }
fieldset { display: grid; gap: .8rem; margin: 0; padding: 1rem; border: 1px solid var(--line); border-radius: var(--radius-sm); }
legend { padding: 0 .35rem; color: var(--primary-strong); font-weight: 900; }
label { display: grid; gap: .35rem; color: var(--text); font-size: .86rem; font-weight: 750; }
input, select, textarea {
    width: 100%;
    min-height: var(--tap);
    padding: .72rem .78rem;
    border: 1px solid var(--line);
    border-radius: 10px;
    outline: none;
    background: #ffffff;
    color: var(--text);
    font-weight: 500;
}
textarea { min-height: 90px; resize: vertical; }
input:focus, select:focus, textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(57, 169, 232, .15); }
label small { font-weight: 500; }
.check-row { display: flex; align-items: flex-start; gap: .7rem; }
.check-row input { width: 22px; min-height: 22px; margin-top: .1rem; }
.form-grid { display: grid; gap: .8rem; }
.inline-create { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, .8fr) auto; gap: .5rem; }
.inline-create input:only-of-type { grid-column: span 2; }
.option-editor-grid { display: grid; gap: .7rem; }
.option-editor { grid-template-columns: 42px minmax(0, 1fr); align-items: stretch; gap: .55rem; }
.option-editor > span { display: grid; place-items: center; border-radius: 10px; background: var(--primary-soft); color: var(--primary-strong); font-size: 1.05rem; font-weight: 900; }
.mode-picker { display: grid; gap: .7rem; }
.mode-picker label { display: flex; align-items: flex-start; gap: .7rem; padding: .85rem; border: 1px solid var(--line); border-radius: 12px; background: var(--surface-soft); cursor: pointer; }
.mode-picker input { width: 22px; min-height: 22px; margin: .2rem 0 0; }
.mode-picker span { display: grid; gap: .15rem; }

.requirement-list { display: grid; gap: .45rem; padding: 0; list-style: none; }
.requirement-list li { display: flex; gap: .5rem; padding: .55rem .7rem; border-radius: 9px; background: var(--surface-soft); }

.stat-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .7rem; margin-bottom: 1rem; }
.stat-card { display: grid; min-height: 120px; align-content: space-between; padding: .9rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
.stat-card span { color: var(--muted); font-size: .78rem; font-weight: 750; }
.stat-card strong { font-size: 1.9rem; letter-spacing: -.05em; }
.content-grid { display: grid; gap: 1rem; margin-bottom: 1rem; }
.content-grid > .card, section.card, aside.card { padding: 1rem; }
.structure-grid { display: grid; gap: 1rem; }
.simple-list { display: grid; gap: .45rem; margin-top: .9rem; }
.simple-list > div { display: flex; align-items: center; justify-content: space-between; gap: .8rem; padding: .7rem; border-radius: 10px; background: var(--surface-soft); }
.simple-list span { color: var(--muted); font-size: .78rem; text-align: right; }

.list-stack { display: grid; gap: .55rem; }
.list-row, .mission-row { display: flex; align-items: center; gap: .75rem; min-width: 0; padding: .75rem; border: 1px solid var(--line); border-radius: 12px; background: var(--surface-soft); }
.list-icon, .mission-icon, .task-mode-icon { display: grid; flex: 0 0 46px; width: 46px; height: 46px; place-items: center; border-radius: 13px; background: var(--primary-soft); font-size: 1.25rem; }
.task-mode-icon.big { width: 56px; height: 56px; font-size: 1.6rem; }
.list-copy { display: grid; min-width: 0; flex: 1; }
.list-copy strong, .list-copy span { overflow: hidden; text-overflow: ellipsis; }
.list-copy span { color: var(--muted); font-size: .78rem; }
.list-meta { display: grid; text-align: right; }
.score-orb { display: grid; flex: 0 0 52px; width: 52px; height: 52px; place-items: center; border-radius: 50%; background: var(--warning-soft); color: var(--warning); font-size: .8rem; font-weight: 900; }
.score-orb.good { background: var(--success-soft); color: var(--success); }
.score-orb.needs-work { background: var(--danger-soft); color: var(--danger); }
.reward-mini { color: var(--accent); font-size: .78rem; font-weight: 900; white-space: nowrap; }
.empty-inline { padding: 1rem; border: 1px dashed var(--line); border-radius: 10px; color: var(--muted); text-align: center; }
.empty-state { padding: 2rem 1rem; text-align: center; }
.empty-state.compact { padding: 1rem; }
.empty-icon { margin-bottom: .5rem; font-size: 2.5rem; }

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; }
table { width: 100%; border-collapse: collapse; min-width: 720px; }
th, td { padding: .75rem; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: var(--surface-soft); color: var(--muted); font-size: .72rem; letter-spacing: .04em; text-transform: uppercase; }
tbody tr:last-child td { border-bottom: 0; }
.table-subline { display: block; }
.badge { display: inline-flex; align-items: center; min-height: 26px; padding: .25rem .5rem; border-radius: 999px; background: var(--surface-strong); color: var(--muted); font-size: .68rem; font-weight: 900; letter-spacing: .03em; text-transform: uppercase; }
.badge.active, .badge.published { background: var(--success-soft); color: var(--success); }
.badge.archived { background: var(--surface-strong); color: var(--muted); }

.student-card-grid { display: grid; gap: .7rem; }
.student-card { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: .75rem; padding: .8rem; border: 1px solid var(--line); border-radius: 13px; background: var(--surface-soft); color: var(--text); }
.student-avatar-placeholder { display: grid; width: 44px; height: 44px; place-items: center; border-radius: 50%; background: var(--primary); color: white; font-weight: 900; }
.student-card-copy { display: grid; min-width: 0; }
.student-card-copy span { overflow: hidden; color: var(--muted); font-size: .75rem; text-overflow: ellipsis; white-space: nowrap; }
.student-mini-stats { display: grid; gap: .1rem; color: var(--muted); font-size: .7rem; text-align: right; }
.profile-summary { display: grid; grid-template-columns: auto minmax(0, 1fr); align-items: center; gap: .8rem; margin-bottom: 1rem; padding: 1rem; }
.profile-summary > div:not(.profile-avatar-icon) { display: grid; }
.profile-avatar-icon { display: grid; width: 68px; height: 68px; place-items: center; border-radius: 18px; background: var(--primary-soft); font-size: 2.6rem; }
.profile-coins strong { color: var(--accent); }
.mastery-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .65rem; }
.mastery-chip { display: grid; padding: .8rem; border-radius: 12px; background: var(--surface-soft); }
.mastery-chip strong { font-size: 1.35rem; }
.mastery-chip span { color: var(--muted); font-size: .76rem; text-transform: capitalize; }
.mastery-chip.alert-chip { background: var(--warning-soft); }
.timeline { display: grid; gap: .65rem; margin-top: 1rem; }
.timeline > div { display: grid; gap: .15rem; padding-left: .75rem; border-left: 3px solid var(--primary-soft); }
.timeline span { color: var(--muted); font-size: .82rem; }

.question-admin-list { display: grid; gap: .6rem; }
.question-admin-row { display: grid; grid-template-columns: auto minmax(0, 1fr) auto auto; align-items: center; gap: .65rem; padding: .75rem; border: 1px solid var(--line); border-radius: 12px; background: var(--surface-soft); }
.question-admin-row.is-muted { opacity: .6; }
.question-id { color: var(--muted); font-size: .72rem; font-weight: 900; }
.question-admin-copy { display: grid; min-width: 0; }
.question-admin-copy strong { display: -webkit-box; overflow: hidden; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
.question-admin-copy span { color: var(--muted); font-size: .73rem; }
.task-admin-grid { display: grid; gap: .8rem; }
.task-admin-card { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: .75rem; padding: .9rem; border: 1px solid var(--line); border-radius: 14px; background: var(--surface-soft); }
.task-admin-copy h2 { margin-top: .35rem; }
.task-admin-copy p { margin: 0; color: var(--muted); font-size: .8rem; }
.task-admin-stats { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .5rem; }
.task-admin-stats > div { display: grid; padding: .55rem; border-radius: 9px; background: var(--surface); }
.task-admin-stats span { color: var(--muted); font-size: .65rem; }
.task-admin-card footer { grid-column: 1 / -1; display: flex; flex-wrap: wrap; justify-content: space-between; gap: .3rem; color: var(--muted); font-size: .74rem; }
.announcement-list, .announcement-mini-list { display: grid; gap: .7rem; }
.announcement-list article, .announcement-mini-list article { padding: .85rem; border: 1px solid var(--line); border-radius: 12px; background: var(--surface-soft); }
.announcement-list article > small { display: block; margin-top: .7rem; }
.announcement-mini-list article span { display: block; color: var(--primary); font-size: .68rem; font-weight: 900; text-transform: uppercase; }
.announcement-mini-list article strong { display: block; margin: .15rem 0; }
.announcement-mini-list article p { margin: 0; color: var(--muted); font-size: .82rem; }

.student-home-hero { display: grid; grid-template-columns: minmax(0, 1fr) 120px; align-items: center; gap: .5rem; overflow: hidden; margin-bottom: .8rem; padding: 1rem; background: linear-gradient(135deg, #137fbf, #62c7f2); color: white; }
.student-home-hero .eyebrow { color: #e8f8ff; }
.student-home-hero p { color: rgba(255,255,255,.78); font-size: .85rem; }
.student-home-hero .button { background: #fff; color: var(--primary-strong); box-shadow: none; }
.student-resource-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .5rem; margin-bottom: .8rem; }
.resource-pill { display: grid; min-width: 0; padding: .65rem .55rem; border: 1px solid var(--line); border-radius: 13px; background: var(--surface); text-align: center; box-shadow: var(--shadow); }
.resource-pill > span { color: var(--accent); }
.resource-pill strong { overflow: hidden; font-size: .85rem; text-overflow: ellipsis; white-space: nowrap; }
.resource-pill small { font-size: .63rem; }
.xp-card { margin-bottom: 1rem; }
.progress-track { height: 10px; overflow: hidden; border-radius: 999px; background: var(--surface-strong); }
.progress-track > span { display: block; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--primary), #7ed7f6); transition: width .35s ease; }
.quick-actions { display: grid; gap: .55rem; }
.quick-actions > a { display: grid; grid-template-columns: 42px minmax(0, 1fr) auto; align-items: center; gap: .7rem; padding: .7rem; border: 1px solid var(--line); border-radius: 12px; background: var(--surface-soft); color: var(--text); }
.quick-actions > a > span { display: grid; width: 42px; height: 42px; place-items: center; border-radius: 11px; background: var(--primary-soft); color: var(--primary-strong); font-size: 1.2rem; }
.quick-actions > a > div { display: grid; }
.quick-actions b { color: var(--muted); font-size: 1.4rem; }

.student-task-grid { display: grid; gap: .9rem; }
.student-task-card { display: grid; gap: .85rem; padding: 1rem; }
.student-task-card.is-expired { opacity: .7; }
.student-task-card > header { display: flex; align-items: center; gap: .75rem; }
.student-task-card > header h2 { margin-top: .3rem; }
.student-task-card > p { margin: 0; color: var(--muted); }
.task-detail-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .45rem; }
.task-detail-grid span { display: grid; padding: .55rem; border-radius: 9px; background: var(--surface-soft); color: var(--muted); font-size: .69rem; }
.task-detail-grid strong { color: var(--text); font-size: .82rem; }
.reward-banner { display: flex; align-items: center; justify-content: space-between; gap: .5rem; padding: .7rem; border-radius: 10px; background: var(--accent-soft); color: #66430a; font-size: .75rem; }
.student-task-card > footer { display: flex; align-items: flex-end; justify-content: space-between; gap: .7rem; }
.student-task-card > footer > div { display: grid; }
.student-task-card > footer > div span { color: var(--muted); font-size: .72rem; }

.result-card { width: min(100%, 800px); margin: 1rem auto; padding: 1.2rem; text-align: center; }
.result-emblem { font-size: 4rem; }
.result-score { display: grid; margin: 1rem auto; }
.result-score strong { font-size: clamp(3rem, 16vw, 5.2rem); line-height: 1; letter-spacing: -.08em; }
.result-score span { color: var(--muted); }
.result-stat-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .55rem; margin: 1rem 0; }
.result-stat-grid > div { display: grid; padding: .75rem; border-radius: 11px; background: var(--surface-soft); }
.result-stat-grid span { color: var(--muted); font-size: .68rem; }
.result-balance { display: flex; justify-content: space-between; gap: .5rem; margin-bottom: 1rem; padding: .8rem; border-radius: 10px; background: var(--accent-soft); }
.result-card.passed { border-top: 5px solid var(--success); }
.result-card.not-passed { border-top: 5px solid var(--warning); }

.heroes-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .7rem; }
.hero-showcase { overflow: hidden; text-align: center; }
.hero-display { position: relative; display: grid; min-height: 190px; place-items: center; overflow: hidden; background: linear-gradient(165deg, #e8f7ff, #fdfefe); }
.hero-backdrop { position: absolute; width: 120px; height: 120px; border: 18px solid rgba(57,169,232,.09); border-radius: 50%; }
.hero-base-icon { position: relative; font-size: 5rem; filter: drop-shadow(0 12px 12px rgba(23,32,29,.15)); }
.hero-equipment-icons { position: absolute; right: .4rem; bottom: .4rem; left: .4rem; padding: .35rem; border-radius: 9px; background: rgba(255,255,255,.82); font-size: .85rem; backdrop-filter: blur(8px); }
.hero-showcase > div:last-child { padding: .8rem; }
.hero-showcase p { margin: 0; color: var(--muted); font-size: .75rem; }

.shop-heading { flex-direction: row; align-items: flex-start; justify-content: space-between; }
.coin-balance { display: grid; flex: 0 0 auto; padding: .55rem .75rem; border-radius: 12px; background: var(--accent-soft); color: #6b480a; text-align: center; }
.coin-balance strong { font-size: 1.15rem; }
.coin-balance span { font-size: .65rem; }
.filter-tabs { display: flex; gap: .45rem; overflow-x: auto; margin-bottom: .8rem; padding-bottom: .25rem; scrollbar-width: none; }
.filter-tabs::-webkit-scrollbar { display: none; }
.filter-tabs button { min-height: 40px; padding: .5rem .75rem; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); color: var(--muted); font-weight: 800; white-space: nowrap; }
.filter-tabs button.active { border-color: var(--primary); background: var(--primary-soft); color: var(--primary-strong); }
.shop-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .65rem; }
.shop-item { display: grid; gap: .55rem; min-width: 0; padding: .75rem; border-top-width: 4px; }
.shop-item[hidden] { display: none; }
.shop-item-icon { display: grid; min-height: 96px; place-items: center; border-radius: 12px; background: var(--surface-soft); font-size: 3.5rem; }
.shop-item-copy h2 { margin: .15rem 0; font-size: .95rem; }
.shop-item-copy p { display: -webkit-box; overflow: hidden; margin: 0; color: var(--muted); font-size: .7rem; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
.rarity-label { color: var(--muted); font-size: .6rem; font-weight: 900; text-transform: uppercase; }
.rarity-common { border-top-color: #9aac9f; }
.rarity-rare { border-top-color: #3480c9; }
.rarity-epic { border-top-color: #8c51c6; }
.rarity-legendary { border-top-color: #c68619; }
.shop-requirements { display: flex; align-items: center; justify-content: space-between; color: var(--muted); font-size: .68rem; }
.shop-requirements strong { color: var(--accent); }
.shop-item .button { min-height: 42px; padding-inline: .4rem; font-size: .72rem; }

.avatar-workbench { display: grid; gap: 1rem; }
.avatar-preview-card { padding: 1rem; text-align: center; }
.avatar-preview-card > p { color: var(--muted); }
.avatar-config-column { display: grid; gap: 1rem; }
.equipped-slots { display: grid; gap: .4rem; margin-top: 1rem; text-align: left; }
.equipped-slots > div { display: grid; grid-template-columns: 70px minmax(0, 1fr) auto; align-items: center; gap: .4rem; padding: .55rem; border-radius: 9px; background: var(--surface-soft); }
.equipped-slots span { color: var(--muted); font-size: .68rem; }
.equipped-slots strong { overflow: hidden; font-size: .77rem; text-overflow: ellipsis; white-space: nowrap; }
.model-picker { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .55rem; }
.model-option { border: 2px solid transparent; border-radius: 13px; background: var(--surface-soft); }
.model-option.selected { border-color: var(--primary); background: var(--primary-soft); }
.model-option button { display: grid; width: 100%; min-height: 150px; place-items: center; align-content: center; gap: .2rem; padding: .6rem; border: 0; background: transparent; color: var(--text); cursor: pointer; text-align: center; }
.model-option button > span { font-size: 3.3rem; }
.model-option small { font-size: .64rem; }
.inventory-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .55rem; }
.inventory-item { display: grid; gap: .25rem; padding: .65rem; border: 1px solid var(--line); border-radius: 11px; background: var(--surface-soft); text-align: center; }
.inventory-item > div { font-size: 2.4rem; }
.inventory-item strong { font-size: .78rem; }
.inventory-item span { color: var(--muted); font-size: .65rem; }
.inventory-item button { min-height: 38px; border: 0; border-radius: 9px; background: var(--primary); color: white; font-weight: 800; }
.inventory-item button:disabled { background: var(--surface-strong); color: var(--muted); }

.avatar-stage { position: relative; display: grid; place-items: center; isolation: isolate; margin-inline: auto; }
.avatar-stage::before { position: absolute; z-index: -2; content: ""; width: 86%; aspect-ratio: 1; border-radius: 50%; background: radial-gradient(circle, rgba(255,255,255,.22), transparent 68%); }
.avatar-base { position: relative; z-index: 2; filter: drop-shadow(0 12px 13px rgba(0,0,0,.18)); }
.avatar-back, .avatar-head, .avatar-torso, .avatar-weapon, .avatar-legs, .avatar-feet { position: absolute; z-index: 3; line-height: 1; filter: drop-shadow(0 4px 4px rgba(0,0,0,.18)); }
.avatar-back { z-index: 1; top: 24%; left: 8%; }
.avatar-head { top: 8%; right: 14%; }
.avatar-torso { top: 43%; left: 8%; }
.avatar-weapon { top: 38%; right: 2%; }
.avatar-legs { bottom: 18%; left: 13%; }
.avatar-feet { right: 15%; bottom: 4%; }
.avatar-base-label { position: absolute; z-index: 4; bottom: 0; padding: .18rem .4rem; border-radius: 999px; background: rgba(255,255,255,.7); color: var(--text); font-size: .55rem; font-weight: 800; backdrop-filter: blur(6px); }
.avatar-large { width: 120px; height: 150px; }
.avatar-large .avatar-base { font-size: 5.2rem; }
.avatar-large > div:not(.avatar-base) { font-size: 1.35rem; }
.avatar-xlarge { width: min(100%, 250px); height: 300px; }
.avatar-xlarge .avatar-base { font-size: 9rem; }
.avatar-xlarge > div:not(.avatar-base) { font-size: 2.2rem; }
.avatar-battle { width: 125px; height: 150px; }
.avatar-battle .avatar-base { font-size: 5rem; }
.avatar-battle > div:not(.avatar-base) { font-size: 1.3rem; }

.game-shell { display: grid; gap: .7rem; max-width: 900px; margin: 0 auto; }
.game-topbar { display: grid; grid-template-columns: 42px minmax(0, 1fr) auto; align-items: center; gap: .6rem; }
.game-topbar > a { display: grid; width: 42px; height: 42px; place-items: center; border-radius: 50%; background: var(--surface); color: var(--text); font-size: 1.8rem; }
.game-topbar > div { display: grid; min-width: 0; }
.game-topbar strong, .game-topbar small { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.game-topbar > span { padding: .35rem .55rem; border-radius: 999px; background: var(--primary-soft); color: var(--primary-strong); font-size: .68rem; font-weight: 900; }
.answer-feedback { padding: .75rem; border-radius: 12px; animation: feedback-in .22s ease-out; }
.answer-feedback.correct { border: 1px solid #a8ddc6; background: var(--success-soft); color: #0d5339; }
.answer-feedback.incorrect { border: 1px solid #e8b7b7; background: var(--danger-soft); color: #792626; }
.answer-feedback p { margin: .25rem 0 0; font-size: .78rem; }
.recovery-banner, .second-wind { margin: 0; padding: .65rem; border-radius: 10px; background: var(--warning-soft); color: #63480b; font-size: .75rem; text-align: center; }
.battle-stage { display: grid; grid-template-columns: minmax(0, 1fr) 35px minmax(0, 1fr); align-items: end; gap: .15rem; min-height: 260px; overflow: hidden; padding: .75rem; background: linear-gradient(180deg, #dff4ff 0 62%, #c8e7f5 62% 72%, #a9cad9 72%); }
.fighter { display: grid; align-self: stretch; align-content: end; min-width: 0; }
.health-label { display: flex; justify-content: space-between; gap: .4rem; margin-bottom: .25rem; font-size: .63rem; font-weight: 900; }
.health-label span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.health-track { height: 10px; overflow: hidden; border: 2px solid rgba(24,52,77,.55); border-radius: 999px; background: #dce9f1; }
.health-track span { display: block; height: 100%; transition: width .28s ease; }
.health-track.player span { background: linear-gradient(90deg, #279ed8, #75d3f2); }
.health-track.enemy span { background: linear-gradient(90deg, #d94f4f, #f18f62); }
.versus { align-self: center; color: rgba(24,52,77,.48); font-size: .75rem; font-weight: 1000; text-align: center; }
.enemy-character { display: grid; min-height: 150px; place-items: center; font-size: 6.3rem; filter: drop-shadow(0 14px 14px rgba(38,91,122,.18)); }
.question-panel { padding: 1rem; }
.question-panel h1, .question-panel h2 { margin: .8rem 0 1rem; font-size: clamp(1.15rem, 5vw, 1.65rem); line-height: 1.3; letter-spacing: -.015em; }
.question-meta { display: flex; justify-content: space-between; gap: .5rem; color: var(--muted); font-size: .72rem; }
.answer-grid { display: grid; gap: .6rem; }
.answer-grid button { display: grid; grid-template-columns: 42px minmax(0, 1fr); align-items: center; min-height: 62px; gap: .65rem; padding: .6rem; border: 1px solid var(--line); border-radius: 12px; background: var(--surface-soft); color: var(--text); cursor: pointer; text-align: left; }
.answer-grid button:active { transform: scale(.985); }
.answer-grid button > span { display: grid; width: 42px; height: 42px; place-items: center; border-radius: 10px; background: var(--primary-soft); color: var(--primary-strong); font-weight: 900; }
.answer-grid button > strong { font-size: .88rem; line-height: 1.32; }

.exam-shell { display: grid; gap: .8rem; max-width: 850px; margin: 0 auto; }
.exam-header { display: flex; align-items: flex-start; justify-content: space-between; gap: .7rem; }
.exam-header h1 { font-size: 1.45rem; }
.exam-header span { color: var(--muted); font-size: .8rem; }
.exam-timer { display: grid; flex: 0 0 auto; min-width: 86px; padding: .55rem; border-radius: 12px; background: var(--surface); text-align: center; box-shadow: var(--shadow); }
.exam-timer span { color: var(--muted); font-size: .63rem; }
.exam-timer strong { font-variant-numeric: tabular-nums; }
.exam-timer.is-low { background: var(--danger-soft); color: var(--danger); }
.exam-progress { display: grid; gap: .3rem; }
.exam-progress > span { color: var(--muted); font-size: .72rem; }
.exam-question { padding: 1rem; }
.exam-note { color: var(--muted); font-size: .72rem; text-align: center; }

@keyframes feedback-in { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: translateY(0); } }

.field-caption { display: block; margin-bottom: .45rem; color: var(--muted); font-size: .7rem; font-weight: 850; letter-spacing: .03em; text-transform: uppercase; }
.question-admin-row { grid-template-columns: 1fr; align-items: stretch; background: #fff; }
.question-admin-header { display: flex; align-items: center; justify-content: space-between; gap: .75rem; }
.question-admin-actions { display: flex; justify-content: flex-end; padding-top: .2rem; }
.course-assignment-block { display: grid; gap: .35rem; }
.course-chip-list { display: flex; flex-wrap: wrap; gap: .45rem; }
.course-chip { display: inline-flex; max-width: 100%; align-items: center; gap: .45rem; padding: .42rem .45rem .42rem .65rem; border: 1px solid #cfe6f4; border-radius: 999px; background: var(--primary-soft); color: var(--primary-strong); }
.course-chip > span { display: grid; min-width: 0; }
.course-chip strong, .course-chip small { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.course-chip strong { font-size: .75rem; }
.course-chip small { color: var(--muted); font-size: .6rem; }
.course-chip form { margin: 0; }
.chip-remove { display: grid; width: 28px; height: 28px; place-items: center; padding: 0; border: 0; border-radius: 50%; background: rgba(255,255,255,.78); color: var(--danger); font-size: 1.05rem; cursor: pointer; }
.assignment-panel { border: 1px solid var(--line); border-radius: 12px; background: var(--surface-soft); }
.assignment-panel summary { min-height: 46px; padding: .75rem; color: var(--primary-strong); font-size: .8rem; font-weight: 850; cursor: pointer; }
.assignment-form { display: grid; gap: .65rem; padding: 0 .75rem .75rem; }
.compact-assignment { margin-top: .8rem; padding: 0; }
.small-empty { padding: .65rem; font-size: .75rem; }
.managed-list-row { display: flex !important; align-items: center; justify-content: space-between; gap: .75rem; }
.managed-list-copy { display: grid; min-width: 0; }
.managed-list-copy span, .managed-list-copy small { color: var(--muted); font-size: .7rem; }
.group-manager-card { margin-bottom: 1rem; }
.student-group-chips { margin-bottom: .4rem; }
.danger-zone { display: grid; gap: 1rem; margin-top: 1rem; border-color: #f0cbd0; background: #fffafb; }
.danger-zone p { margin-bottom: 0; color: var(--muted); }
.version-panel { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: .7rem; margin: 1rem 0; }
.version-panel > div { display: grid; padding: .8rem; border: 1px solid var(--line); border-radius: 12px; background: var(--surface-soft); }
.version-panel span { color: var(--muted); font-size: .68rem; }
.version-panel strong { color: var(--primary-strong); }

@media (min-width: 600px) {
    .main-content { padding-inline: 1.4rem; }
    .page-heading { flex-direction: row; align-items: flex-start; justify-content: space-between; }
    .form-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .form-grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .option-editor-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .stat-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .stat-grid:not(.four) { grid-template-columns: repeat(auto-fit, minmax(145px, 1fr)); }
    .student-card-grid, .student-task-grid, .task-admin-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .profile-summary { grid-template-columns: auto minmax(0, 1fr) auto auto; }
    .heroes-grid, .shop-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .inventory-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .mode-picker { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .battle-stage { min-height: 340px; padding: 1rem 1.5rem; }
    .avatar-battle { width: 180px; height: 230px; }
    .avatar-battle .avatar-base { font-size: 7.5rem; }
    .avatar-battle > div:not(.avatar-base) { font-size: 1.9rem; }
    .enemy-character { min-height: 230px; font-size: 9rem; }
    .answer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
    .app-shell { display: grid; grid-template-columns: 245px minmax(0, 1fr); }
    .sidebar {
        position: sticky;
        top: 0;
        display: flex;
        height: 100vh;
        flex-direction: column;
        padding: 1.1rem;
        border-right: 1px solid var(--line);
        background: var(--surface);
    }
    .side-nav { display: grid; gap: .35rem; margin-top: 1.5rem; }
    .nav-link { display: flex; min-height: 48px; align-items: center; gap: .75rem; padding: .65rem .75rem; border-radius: 11px; color: var(--muted); font-weight: 750; }
    .nav-link.active { background: var(--primary-soft); color: var(--primary-strong); }
    .nav-symbol { display: grid; width: 24px; place-items: center; font-weight: 900; }
    .sidebar-account { display: grid; gap: .5rem; margin-top: auto; padding: .8rem; border-radius: 12px; background: var(--surface-soft); }
    .account-copy { display: grid; min-width: 0; }
    .account-copy strong, .account-copy small { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
    .topbar { display: none; }
    .bottom-nav { display: none; }
    .main-content { padding: 1.6rem 1.8rem 3rem; }
    .content-grid.two-columns { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .content-grid.aside-grid { grid-template-columns: minmax(0, 1fr) 340px; }
    .sticky-card { position: sticky; top: 1.5rem; }
    .structure-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .avatar-workbench { grid-template-columns: 360px minmax(0, 1fr); align-items: start; }
    .avatar-preview-card { position: sticky; top: 1.5rem; }
    .heroes-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .shop-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .student-home-hero { grid-template-columns: minmax(0, 1fr) 260px; min-height: 300px; padding: 1.8rem; }
    .assignment-form { grid-template-columns: minmax(160px, .8fr) minmax(220px, 1.2fr) auto; align-items: end; }
    .compact-assignment { grid-template-columns: minmax(240px, 1fr) auto; }
    .danger-zone { grid-template-columns: minmax(0, 1fr) auto; align-items: center; }
    .avatar-large { width: 240px; height: 280px; }
    .avatar-large .avatar-base { font-size: 9rem; }
    .avatar-large > div:not(.avatar-base) { font-size: 2.2rem; }
}

@media (min-width: 1250px) {
    .app-shell { grid-template-columns: 270px minmax(0, 1fr); }
    .structure-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .student-task-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .shop-grid { grid-template-columns: repeat(5, minmax(0, 1fr)); }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
}

/* Administración y navegación simplificadas para la base compartida. */
.callout-card { margin-bottom: 1rem; border-left: 4px solid var(--primary); background: var(--primary-soft); }
.callout-card p:last-child { margin-bottom: 0; }
.inline-actions { display: flex; flex-wrap: wrap; gap: .4rem; align-items: center; }
.inline-actions form { margin: 0; }
.button.small { min-height: 38px; padding: .45rem .65rem; font-size: .72rem; box-shadow: none; }
.button.danger-outline { border-color: var(--danger); background: transparent; color: var(--danger); box-shadow: none; }
.button.danger-outline:hover, .button.danger-outline:focus-visible { border-color: var(--danger); background: var(--danger-soft); color: var(--danger); }
.badge.success { background: var(--success-soft); color: var(--success); }
.badge.muted { background: var(--surface-strong); color: var(--muted); }
.quick-actions small { color: var(--muted); font-size: .72rem; line-height: 1.35; }

@media (max-width: 720px) {
    .inline-actions { min-width: 150px; }
    .role-admin .stat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}