/* BKFO Aufgaben – Schüler-App. Für iPad (Hoch- und Querformat) optimiert. */
:root {
	--bg: #f4f3ef;
	--card: #ffffff;
	--ink: #1d1d1b;
	--muted: #6b6a65;
	--line: #dedcd5;
	--soft: #ecebe6;
	--accent: #2c5f8d;
	--accent-ink: #ffffff;
	--accent-soft: #e5eef7;
	--ok: #2f7d4f;
	--ok-soft: #e4f2e9;
	--bad: #b3402f;
	--bad-soft: #f8e6e2;
	--warn: #9a6a12;
	--warn-soft: #fbf0d9;
	--e1: #1f6f6a;
	--e2: #7a4b9c;
	--radius: 14px;
	--shadow: 0 1px 2px rgba(0,0,0,.05), 0 2px 10px rgba(0,0,0,.04);
	color-scheme: light;
}
@media (prefers-color-scheme: dark) {
	:root {
		--bg: #151514;
		--card: #1f1f1d;
		--ink: #efeee9;
		--muted: #a3a29b;
		--line: #3a3a36;
		--soft: #2a2a27;
		--accent: #79a9d6;
		--accent-ink: #0f1a24;
		--accent-soft: #1f2f3e;
		--ok: #7cc79a;
		--ok-soft: #1c3226;
		--bad: #ec8b79;
		--bad-soft: #3a211c;
		--warn: #e3b35c;
		--warn-soft: #3a2f18;
		--e1: #6cc2bb;
		--e2: #c29be0;
		--shadow: none;
		color-scheme: dark;
	}
}

body.bkfo-app *, .bkfo-item, .bkfo-item * { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body.bkfo-app {
	margin: 0;
	background: var(--bg);
	color: var(--ink);
	font: 17px/1.5 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
	-webkit-font-smoothing: antialiased;
	padding-bottom: env(safe-area-inset-bottom);
}
.bkfo-app a, .bkfo-item a { color: var(--accent); }
.bkfo-app p, .bkfo-item p { margin: 0 0 .6em; }
.bkfo-app p:last-child, .bkfo-item p:last-child { margin-bottom: 0; }
.bkfo-app ul, .bkfo-item ul, .bkfo-app ol, .bkfo-item ol { margin: 0 0 .6em; padding-left: 1.4em; }

/* ---------- Kopfleiste ---------- */
.bkfo-topbar {
	position: sticky; top: 0; z-index: 20;
	background: color-mix(in srgb, var(--bg) 88%, transparent);
	backdrop-filter: saturate(1.4) blur(12px);
	-webkit-backdrop-filter: saturate(1.4) blur(12px);
	border-bottom: 1px solid var(--line);
	padding-top: env(safe-area-inset-top);
}
.bkfo-topbar-inner {
	max-width: 860px; margin: 0 auto; padding: 10px 20px;
	display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 52px;
}
.bkfo-topbar-left, .bkfo-topbar-right { display: flex; align-items: center; gap: 14px; min-width: 0; }
.bkfo-brand { font-weight: 700; letter-spacing: -.01em; }
.bkfo-back { text-decoration: none; font-weight: 600; padding: 6px 0; white-space: nowrap; }
.bkfo-user { font-variant-numeric: tabular-nums; color: var(--muted); font-size: 15px; }
.bkfo-link { font-size: 15px; text-decoration: none; }
.bkfo-save { font-size: 14px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bkfo-save.is-ok { color: var(--ok); }
.bkfo-save.is-error { color: var(--bad); font-weight: 600; }

/* ---------- Layout ---------- */
.bkfo-main { max-width: 860px; margin: 0 auto; padding: 24px 20px 140px; }
.bkfo-h1 { font-size: 30px; line-height: 1.2; letter-spacing: -.02em; margin: 6px 0 18px; }
.bkfo-h2 { font-size: 21px; letter-spacing: -.01em; margin: 0 0 14px; }
.bkfo-muted { color: var(--muted); }
.bkfo-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.bkfo-note { font-size: 15px; background: var(--warn-soft); color: var(--warn); border-radius: 10px; padding: 10px 14px; }
.bkfo-empty { color: var(--muted); text-align: center; }

/* ---------- Login ---------- */
.bkfo-login { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.bkfo-login-card { width: 100%; max-width: 400px; }
.bkfo-login-card h1 { margin: 0 0 6px; font-size: 28px; }
.bkfo-field { display: block; margin: 16px 0; }
.bkfo-field span { display: block; font-weight: 600; font-size: 15px; margin-bottom: 6px; }
.bkfo-field input {
	width: 100%; font-size: 18px; padding: 12px 14px; border-radius: 10px;
	border: 1px solid var(--line); background: var(--bg); color: var(--ink);
}
.bkfo-alert { background: var(--bad-soft); color: var(--bad); padding: 10px 14px; border-radius: 10px; font-size: 15px; }

/* ---------- Buttons ---------- */
.bkfo-btn {
	font: inherit; font-weight: 600; font-size: 17px; min-height: 48px; padding: 10px 22px;
	border-radius: 12px; border: 1px solid var(--line); background: var(--card); color: var(--ink); cursor: pointer;
}
.bkfo-btn-primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.bkfo-btn:disabled { opacity: .5; cursor: default; }
.bkfo-btn-block { width: 100%; margin-top: 8px; }

/* ---------- Übersicht ---------- */
.bkfo-lessons { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.bkfo-lesson-link {
	display: grid; grid-template-columns: 1fr auto; grid-template-areas: "meta status" "title status";
	gap: 4px 16px; align-items: center; text-decoration: none; color: var(--ink);
	background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 20px; box-shadow: var(--shadow);
}
.bkfo-lesson-link:active { transform: scale(.995); }
.bkfo-lesson-meta { grid-area: meta; display: flex; gap: 10px; align-items: center; }
.bkfo-lesson-title { grid-area: title; font-size: 19px; font-weight: 650; letter-spacing: -.01em; }
.bkfo-lesson-status { grid-area: status; }
.bkfo-date { font-size: 14px; color: var(--muted); font-variant-numeric: tabular-nums; }
.bkfo-badge { font-size: 12px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; padding: 3px 8px; border-radius: 6px; border: 1px solid currentColor; }
.bkfo-badge-e1 { color: var(--e1); }
.bkfo-badge-e2 { color: var(--e2); }
.bkfo-status { font-size: 14px; font-weight: 600; padding: 5px 10px; border-radius: 999px; white-space: nowrap; }
.bkfo-status-new { background: var(--accent-soft); color: var(--accent); }
.bkfo-status-draft { background: var(--warn-soft); color: var(--warn); }
.bkfo-status-done { background: var(--soft); color: var(--muted); }
.bkfo-status-feedback { background: var(--ok-soft); color: var(--ok); }
.bkfo-status-hidden { background: var(--soft); color: var(--muted); font-style: italic; }

/* ---------- Lektion ---------- */
.bkfo-lesson-head { display: flex; gap: 10px; align-items: center; }
.bkfo-intro { margin: 0 0 22px; font-size: 17px; }
.bkfo-banner { border-radius: 12px; padding: 12px 16px; margin: 0 0 20px; font-size: 16px; }
.bkfo-banner-done { background: var(--ok-soft); color: var(--ok); }
.bkfo-section { margin: 0 0 30px; }
.bkfo-section-intro { color: var(--muted); margin: -6px 0 14px; }
.bkfo-locked {
	border: 1.5px dashed var(--line); border-radius: var(--radius); padding: 18px 20px; color: var(--muted);
	display: flex; align-items: center; gap: 10px;
}
.bkfo-locked::before { content: "🔒"; font-size: 18px; }

.bkfo-item {
	background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
	padding: 18px 20px; margin: 0 0 14px; box-shadow: var(--shadow); scroll-margin-top: 80px;
}
.bkfo-type-info { background: transparent; border-color: transparent; box-shadow: none; padding: 4px 0; }
.bkfo-info-title { font-size: 18px; margin: 0 0 8px; }
.bkfo-item-head { display: flex; gap: 12px; align-items: flex-start; margin-bottom: 12px; }
.bkfo-num {
	flex: none; width: 30px; height: 30px; border-radius: 50%; background: var(--soft); color: var(--muted);
	display: grid; place-items: center; font-size: 14px; font-weight: 700; font-variant-numeric: tabular-nums; margin-top: 1px;
}
.bkfo-prompt { flex: 1; font-weight: 550; }
.bkfo-score-chip { flex: none; font-size: 14px; font-weight: 700; background: var(--soft); border-radius: 999px; padding: 3px 10px; }
.bkfo-hint { font-size: 14px; color: var(--muted); margin-top: 8px; }

.bkfo-figure { margin: 0 0 10px; }
.bkfo-figure img { display: block; width: 100%; height: auto; border-radius: 10px; }
.bkfo-figure figcaption { font-size: 14px; color: var(--muted); margin-top: 6px; }
.bkfo-audio { width: 100%; margin: 4px 0 10px; }

/* Auswahl */
.bkfo-options { display: grid; gap: 8px; }
@media (min-width: 700px) { .bkfo-options:not(.bkfo-options-many) { grid-template-columns: 1fr 1fr; } }
.bkfo-option {
	display: flex; gap: 12px; align-items: center; min-height: 52px; padding: 10px 14px;
	border: 1.5px solid var(--line); border-radius: 12px; cursor: pointer; background: var(--card);
	-webkit-tap-highlight-color: transparent;
}
.bkfo-option input { width: 22px; height: 22px; flex: none; accent-color: var(--accent); margin: 0; }
.bkfo-option:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.bkfo-option.is-key, .bkfo-option.is-key:has(input:checked) { border-color: var(--ok); background: var(--ok-soft); }
.bkfo-option.is-wrong, .bkfo-option.is-wrong:has(input:checked) { border-color: var(--bad); background: var(--bad-soft); }
.bkfo-option.is-key::after { content: "✓"; margin-left: auto; color: var(--ok); font-weight: 800; }
.bkfo-option.is-wrong::after { content: "✗"; margin-left: auto; color: var(--bad); font-weight: 800; }

/* Skala */
.bkfo-scale { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.bkfo-scale-label { font-size: 14px; color: var(--muted); }
.bkfo-scale-steps { display: flex; gap: 8px; }
.bkfo-item .bkfo-step input[type=radio] { position: absolute !important; opacity: 0 !important; width: 1px !important; height: 1px !important; margin: 0 !important; pointer-events: none; }
.bkfo-step span {
	display: grid; place-items: center; width: 48px; height: 48px; border-radius: 12px;
	border: 1.5px solid var(--line); font-weight: 700; cursor: pointer; font-variant-numeric: tabular-nums;
}
.bkfo-step input:checked + span { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.bkfo-step input:focus-visible + span { outline: 3px solid var(--accent-soft); }

/* Text */
.bkfo-text {
	display: block; width: 100%; font: inherit; font-size: 17px; line-height: 1.55; color: var(--ink);
	padding: 12px 14px; border: 1.5px solid var(--line); border-radius: 12px; background: var(--bg);
	resize: none; overflow: hidden; min-height: 48px;
}
.bkfo-text:focus, .bkfo-gap:focus, .bkfo-match-select:focus, .bkfo-field input:focus {
	outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft);
}
.bkfo-text:disabled { opacity: 1; background: var(--soft); -webkit-text-fill-color: var(--ink); }
.bkfo-wordcount { font-size: 14px; color: var(--muted); margin-top: 6px; font-variant-numeric: tabular-nums; }
.bkfo-wordcount.is-low { color: var(--warn); }
.bkfo-wordcount.is-ok { color: var(--ok); }
.bkfo-wordcount.is-high { color: var(--bad); }
.bkfo-wc-n { font-weight: 700; }
.bkfo-source {
	background: var(--soft); border-radius: 12px; padding: 14px 16px; margin: 0 0 12px;
	font-size: 16px; max-height: 50vh; overflow: auto; -webkit-overflow-scrolling: touch;
}
.bkfo-source-title { font-weight: 700; margin-bottom: 6px; }
.bkfo-checklist { border: 0; padding: 0; margin: 12px 0 0; }
.bkfo-checklist legend { font-size: 14px; font-weight: 700; color: var(--muted); margin-bottom: 6px; padding: 0; }
.bkfo-checklist label { display: flex; gap: 10px; align-items: flex-start; padding: 5px 0; font-size: 15px; }
.bkfo-checklist input { width: 20px; height: 20px; accent-color: var(--ok); margin: 2px 0 0; flex: none; }

/* Lücken */
.bkfo-gaptext { line-height: 2.3; }
.bkfo-gap {
	font: inherit; font-size: 17px; padding: 4px 8px; margin: 0 3px; border: 0; border-bottom: 2px solid var(--accent);
	border-radius: 6px 6px 0 0; background: var(--accent-soft); color: var(--ink); min-width: 6ch; max-width: 100%;
}
.bkfo-gap:disabled { opacity: 1; -webkit-text-fill-color: var(--ink); }

/* Zuordnen */
.bkfo-match { display: grid; gap: 10px; }
.bkfo-match-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); gap: 10px; align-items: center; }
.bkfo-match-row .bkfo-mark, .bkfo-match-row .bkfo-key { grid-column: 2; }
.bkfo-match-left { font-weight: 600; }
.bkfo-match-select {
	width: 100%; font: inherit; font-size: 16px; min-height: 48px; padding: 8px 12px; border-radius: 10px;
	border: 1.5px solid var(--line); background: var(--bg); color: var(--ink);
}
@media (max-width: 560px) { .bkfo-match-row { grid-template-columns: 1fr; } .bkfo-match-row .bkfo-mark, .bkfo-match-row .bkfo-key { grid-column: 1; } }

/* Rückmeldung */
.bkfo-mark { font-weight: 800; margin: 0 4px; }
.bkfo-ok { color: var(--ok); }
.bkfo-bad { color: var(--bad); }
.bkfo-key { font-size: 14px; color: var(--ok); font-weight: 600; background: var(--ok-soft); border-radius: 6px; padding: 1px 6px; }
.bkfo-feedback { margin-top: 12px; border-left: 4px solid var(--ok); background: var(--ok-soft); border-radius: 0 10px 10px 0; padding: 10px 14px; }
.bkfo-feedback-score { font-weight: 700; margin-bottom: 4px; }

/* Abgabeleiste */
.bkfo-submitbar {
	position: fixed; left: 0; right: 0; bottom: 0; z-index: 20;
	background: color-mix(in srgb, var(--card) 92%, transparent);
	backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
	border-top: 1px solid var(--line); padding-bottom: env(safe-area-inset-bottom);
}
.bkfo-submitbar-inner { max-width: 860px; margin: 0 auto; padding: 12px 20px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.bkfo-progress { font-size: 15px; color: var(--muted); }

/* Dialog */
.bkfo-dialog { border: 0; border-radius: 18px; padding: 24px; max-width: 420px; width: calc(100% - 40px); background: var(--card); color: var(--ink); }
.bkfo-dialog::backdrop { background: rgba(0,0,0,.35); }
.bkfo-dialog h2 { margin: 0 0 10px; }
.bkfo-dialog-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 18px; flex-wrap: wrap; }

@media print {
	.bkfo-topbar, .bkfo-submitbar { display: none; }
	.bkfo-item { box-shadow: none; break-inside: avoid; }
}
.bkfo-feedback-general { margin: -8px 0 22px; }

/* Programmcode (Informatik) */
.bkfo-text.bkfo-mono {
	font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: 15px; line-height: 1.5;
	white-space: pre; overflow-x: auto; tab-size: 4;
}
.bkfo-item pre, .bkfo-app pre { background: var(--soft); border-radius: 10px; padding: 12px 14px; overflow-x: auto; font-size: 15px; }
.bkfo-item code, .bkfo-app code { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: .92em; background: var(--soft); border-radius: 4px; padding: 1px 5px; }
.bkfo-item pre code, .bkfo-app pre code { background: none; padding: 0; }

/* Marke & Login-Kopf */
.bkfo-brand { display: flex; flex-direction: column; line-height: 1.15; text-decoration: none; color: var(--ink); }
.bkfo-brand-title { font-weight: 750; letter-spacing: -.01em; font-size: 17px; }
.bkfo-brand-teacher { font-size: 13px; color: var(--muted); }
.bkfo-user-class { color: var(--muted); }
.bkfo-badge-inf { color: #b4581d; }
@media (prefers-color-scheme: dark) { .bkfo-badge-inf { color: #f0a36b; } }
@media (max-width: 600px) { .bkfo-user-class { display: none; } }

/* Reihenfolge */
.bkfo-order { list-style: none; counter-reset: ord; padding: 0; margin: 0; display: grid; gap: 8px; }
.bkfo-order-item {
	counter-increment: ord; display: flex; align-items: center; gap: 12px; padding: 10px 12px;
	border: 1.5px solid var(--line); border-radius: 12px; background: var(--card);
}
.bkfo-order-item::before {
	content: counter(ord); flex: none; width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center;
	background: var(--soft); color: var(--muted); font-weight: 700; font-size: 14px;
}
.bkfo-order.is-touched .bkfo-order-item::before { background: var(--accent-soft); color: var(--accent); }
.bkfo-order-text { flex: 1; }
.bkfo-order-btns { display: flex; gap: 6px; flex: none; }
.bkfo-order-btns button, .bkfo-order-confirm {
	font: inherit; font-weight: 700; min-width: 44px; min-height: 44px; border-radius: 10px;
	border: 1.5px solid var(--line); background: var(--bg); color: var(--ink); cursor: pointer;
}
.bkfo-order-confirm { min-height: 36px; font-size: 14px; font-weight: 600; padding: 4px 12px; margin-left: 6px; }
.bkfo-order-item.is-moved { animation: bkfo-flash .5s ease; }
@keyframes bkfo-flash { from { background: var(--accent-soft); } to { background: var(--card); } }

/* Hilfe */
.bkfo-hintbox { margin-top: 12px; border-radius: 10px; background: var(--warn-soft); padding: 8px 12px; font-size: 15px; }
.bkfo-hintbox summary { cursor: pointer; font-weight: 700; color: var(--warn); }
.bkfo-hintbox[open] summary { margin-bottom: 6px; }

/* Video */
.bkfo-video { position: relative; width: 100%; aspect-ratio: 16 / 9; margin: 4px 0 10px; border-radius: 10px; overflow: hidden; background: #000; }
.bkfo-video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.bkfo-video-file { width: 100%; border-radius: 10px; margin: 4px 0 10px; }
.bkfo-figure a { display: block; }
.bkfo-app blockquote, .bkfo-item blockquote { margin: 8px 0 12px; padding: 10px 14px; border-left: 4px solid var(--accent); background: var(--accent-soft); border-radius: 0 10px 10px 0; }
.bkfo-item .bkfo-order { padding-left: 0; }

/* ---------- Login: ruhiger Hintergrund, Foto, Karte ---------- */
.bkfo-login {
	position: relative; isolation: isolate; overflow: hidden;
	background:
		radial-gradient(ellipse 90% 60% at 50% -10%, var(--accent-soft), transparent 70%),
		var(--bg);
}
.bkfo-login-bg { position: absolute; inset: 0; z-index: -1; pointer-events: none; }
.bkfo-login-bg::after {
	/* feines Punktraster, zur Mitte hin ausgeblendet */
	content: ""; position: absolute; inset: 0;
	background-image: radial-gradient(color-mix(in srgb, var(--ink) 13%, transparent) 1px, transparent 1.2px);
	background-size: 22px 22px;
	-webkit-mask-image: radial-gradient(ellipse at center, transparent 35%, #000 90%);
	mask-image: radial-gradient(ellipse at center, transparent 35%, #000 90%);
	opacity: .6;
}

.bkfo-login-wrap { width: 100%; max-width: 420px; animation: bkfo-rise .5s cubic-bezier(.2,.8,.2,1) both; }
@keyframes bkfo-rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .bkfo-login-wrap { animation: none; } }
.bkfo-login-head { text-align: center; margin: 0 0 22px; }
.bkfo-login-photo {
	display: block; width: 96px; height: 96px; margin: 0 auto 14px;
	border-radius: 50%; object-fit: cover; background: var(--card);
	border: 3px solid var(--card);
	box-shadow: 0 0 0 1px var(--line), 0 8px 22px -8px rgba(0, 0, 0, .25);
}
.bkfo-login-title { font-size: 34px; font-weight: 800; letter-spacing: -.03em; line-height: 1.1; }
.bkfo-login-teacher { font-size: 18px; color: var(--muted); margin-top: 6px; }
.bkfo-login-card {
	max-width: none; border-radius: 20px;
	box-shadow: 0 1px 2px rgba(0,0,0,.04), 0 16px 40px -16px rgba(0,0,0,.18);
}
.bkfo-login-card h1 { font-size: 24px; margin: 0 0 4px; }

/* ---------- Lehrer-Vorschau ---------- */
.bkfo-app {
	--teacher: #6a3fb5; --teacher-soft: #f1ebfa;
}
@media (prefers-color-scheme: dark) { .bkfo-app { --teacher: #c3a4f2; --teacher-soft: #2a2238; } }
.bkfo-preview-bar { display: flex; flex-wrap: wrap; gap: 6px 16px; align-items: center; justify-content: space-between; margin: 0 0 18px; }
.bkfo-preview-bar a { font-weight: 700; color: inherit; white-space: nowrap; }
.bkfo-teacher {
	margin: 12px 0; padding: 10px 14px; font-size: 15px;
	background: var(--teacher-soft); border: 1px dashed color-mix(in srgb, var(--teacher) 55%, transparent);
	border-left: 4px solid var(--teacher); border-radius: 0 10px 10px 0;
}
.bkfo-teacher-label { font-size: 12px; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; color: var(--teacher); margin-bottom: 4px; }
.bkfo-teacher-sub { font-weight: 700; margin: 8px 0 2px; }
.bkfo-teacher-label + .bkfo-teacher-sub { margin-top: 0; }
.bkfo-gap.is-key, .bkfo-match-select.is-key { border-color: var(--ok); background: var(--ok-soft); color: var(--ok); font-weight: 600; }
.bkfo-item.is-teacher .bkfo-order-item { border-color: color-mix(in srgb, var(--ok) 45%, var(--line)); }
@media print { .bkfo-teacher { break-inside: avoid; } }