:root {
  --bg: #f4f6fb;
  --panel: #ffffff;
  --border: #d8dce8;
  --accent: #2563eb;
  --ok: #16a34a;
  --error: #dc2626;
  --term-bg: #1e1e2e;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  background: var(--bg);
  color: #1f2937;
}

body {
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: white;
}

.logo { font-weight: 700; font-size: 1.2rem; }

.status {
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  font-size: 0.85rem;
  background: rgb(255 255 255 / 0.2);
}
.status--ok::before { content: "● "; color: #86efac; }
.status--error::before { content: "● "; color: #fca5a5; }
.status--connecting::before { content: "● "; color: #fde68a; }

.layout {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(16rem, 1fr) 3fr;
  grid-template-rows: 3fr 2fr;
  grid-template-areas:
    "lesson editor"
    "lesson terminal";
  gap: 0.5rem;
  padding: 0.5rem;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  min-height: 0;
  overflow: hidden;
}

button {
  font: inherit;
  padding: 0.35rem 0.9rem;
  border: none;
  border-radius: 0.4rem;
  cursor: pointer;
  color: white;
  background: var(--accent);
}
button:disabled { opacity: 0.5; cursor: default; }
button.secondary { background: #e5e7eb; color: #1f2937; }
button.run { background: var(--accent); }
button.check { background: var(--ok); }
button.danger { background: #fee2e2; color: var(--error); }

.user { font-size: 0.9rem; }
.admin-page .user { margin-left: auto; }
.topbar-link { color: white; font-size: 0.9rem; }
.topbar-link[hidden] { display: none; }
.topbar-btn { background: rgb(255 255 255 / 0.2); font-size: 0.9rem; padding: 0.2rem 0.7rem; }

.topbar select {
  font: inherit;
  margin-right: auto;
  margin-left: 1rem;
  padding: 0.2rem 0.4rem;
  border-radius: 0.3rem;
  border: none;
}

.lesson {
  grid-area: lesson;
  padding: 1rem;
  overflow-y: auto;
  line-height: 1.5;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.lesson-nav { display: flex; gap: 0.4rem; }
.lesson-nav select { flex: 1; min-width: 0; font: inherit; }
.nav-btn { padding: 0.35rem 0.6rem; }
.lesson-content h1 { font-size: 1.4rem; margin: 0 0 0.5rem; }
.lesson-content h2 { font-size: 1.15rem; }
.lesson-content code { background: #eef2ff; padding: 0.1rem 0.3rem; border-radius: 0.25rem; }
.lesson-content pre { background: #eef2ff; padding: 0.6rem; border-radius: 0.4rem; overflow-x: auto; }
.lesson-content pre code { padding: 0; }

.hints ol { padding-left: 1.2rem; margin: 0 0 0.5rem; }
.hints li { margin-bottom: 0.4rem; }
.hints pre {
  margin: 0;
  white-space: pre-wrap;
  font-family: inherit;
  background: #fef9c3;
  padding: 0.4rem 0.6rem;
  border-radius: 0.4rem;
}
.hints button[hidden] { display: none; }

.check-result {
  border: 2px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.6rem 0.8rem;
}
.check-result[hidden] { display: none; }
.check-result h3 { margin: 0 0 0.4rem; }
.check-result ul { list-style: none; padding: 0; margin: 0 0 0.5rem; }
.check-result li { margin-bottom: 0.3rem; }
.check-result--passed { border-color: var(--ok); background: #f0fdf4; }
.check-result--failed { border-color: #f59e0b; background: #fffbeb; }
.step-ok { color: var(--ok); }
.step-fail { color: var(--error); }
.step-hint { color: #374151; margin-left: 1.3rem; white-space: pre-wrap; }

.editor { grid-area: editor; display: flex; flex-direction: column; }
.editor-toolbar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem;
  border-bottom: 1px solid var(--border);
}
.file-tabs { display: flex; gap: 0.25rem; margin-right: auto; overflow-x: auto; }
.file-tab { background: transparent; color: #374151; font-family: monospace; }
.file-tab--active { background: #e0e7ff; color: var(--accent); }
.save-state { font-size: 0.8rem; color: #6b7280; white-space: nowrap; }
.editor-host { flex: 1; min-height: 0; }

.terminal {
  grid-area: terminal;
  display: flex;
  flex-direction: column;
  background: var(--term-bg);
  padding: 0.4rem;
}
.view { position: relative; flex: 1; min-height: 0; }
.view[hidden], .view-tabs[hidden] { display: none; }
.view-tabs { display: flex; gap: 0.25rem; margin-bottom: 0.4rem; }
.view-tab { background: transparent; color: #cbd5e1; padding: 0.15rem 0.7rem; font-size: 0.85rem; }
.view-tab--active { background: #334155; color: white; }
#preview-reload { margin-left: auto; }
#preview { width: 100%; height: 100%; border: 0; background: white; border-radius: 0.25rem; }
#terminal { width: 100%; height: 100%; }

.reconnect {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgb(30 30 46 / 0.85);
  color: white;
}
.reconnect[hidden] { display: none; }
.reconnect button {
  font-size: 1rem;
  padding: 0.5rem 1.2rem;
  border: none;
  border-radius: 0.4rem;
  background: var(--accent);
  color: white;
  cursor: pointer;
}

.notice {
  padding: 0.25rem 1rem;
  font-size: 0.8rem;
  color: #6b7280;
}

/* --- Login --------------------------------------------------------------- */

.login-page { align-items: center; justify-content: center; }
.login-card {
  width: min(22rem, 92vw);
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  padding: 2rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
}
.login-card h1 { margin: 0; color: var(--accent); }
.login-card p { margin: 0; }
.login-card label { display: flex; flex-direction: column; gap: 0.3rem; font-weight: 600; }
.login-card input { font: inherit; font-size: 1.1rem; padding: 0.5rem; border: 1px solid var(--border); border-radius: 0.4rem; }
.login-card button { font-size: 1.1rem; padding: 0.6rem; }
.login-error { color: var(--error); }
.login-error[hidden] { display: none; }

/* --- Admin --------------------------------------------------------------- */

.admin-page { overflow-y: auto; }
.admin { padding: 1rem; display: flex; flex-direction: column; gap: 1rem; max-width: 80rem; }
.admin-card { background: var(--panel); border: 1px solid var(--border); border-radius: 0.5rem; padding: 1rem; overflow-x: auto; }
.admin-card[hidden] { display: none; }
.admin-card h2 { margin: 0 0 0.75rem; font-size: 1.15rem; }
.admin-table { border-collapse: collapse; width: 100%; font-size: 0.9rem; }
.admin-table th, .admin-table td { text-align: left; padding: 0.4rem 0.5rem; border-bottom: 1px solid var(--border); }
.admin-table .actions { display: flex; flex-wrap: wrap; gap: 0.3rem; }
.admin-table .actions button { font-size: 0.8rem; padding: 0.2rem 0.5rem; }
.mono { font-family: monospace; }
.admin-form { display: flex; flex-wrap: wrap; align-items: flex-end; gap: 0.75rem; }
.admin-form label { display: flex; flex-direction: column; gap: 0.2rem; font-size: 0.85rem; }
.admin-form input, .admin-form select { font: inherit; padding: 0.3rem; }
.admin-message { margin: 0; padding: 0.5rem 0.8rem; border-radius: 0.4rem; }
.admin-message[hidden] { display: none; }
.admin-message--ok { background: #f0fdf4; color: var(--ok); }
.admin-message--error { background: #fee2e2; color: var(--error); }

.log-tabs { display: flex; gap: 0.3rem; margin-bottom: 0.5rem; }
.log-tabs button.active { background: var(--accent); color: #fff; }
.log-hint { margin: 0 0 0.5rem; font-size: 0.85rem; color: #6b7280; }
.log-table td.mono { white-space: pre-wrap; word-break: break-all; }
.log-table .fail { color: var(--error); }
#log-more { margin-top: 0.5rem; }
#log-more[hidden], .log-player[hidden] { display: none; }
.log-player { margin-top: 1rem; }

.packages-form { display: grid; grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr)); gap: 0.75rem; }
.packages-form label { display: flex; flex-direction: column; gap: 0.2rem; font-size: 0.85rem; }
.packages-form textarea { font-family: monospace; font-size: 0.9rem; padding: 0.3rem; resize: vertical; }
.packages-actions { display: flex; align-items: center; gap: 0.5rem; margin: 0.75rem 0 0.5rem; flex-wrap: wrap; }
.packages-actions .fail { color: var(--error); }
.build-log { max-height: 20rem; overflow: auto; background: #111827; color: #e5e7eb; padding: 0.5rem; font-size: 0.8rem; white-space: pre-wrap; }

/* --- Live-Ansicht für Lehrende ---------------------------------------------- */

.live-table tr.live-row--offline { color: #9ca3af; }
.live-table tr.live-row--help { background: #fef2f2; }
.live-table tr.live-row--selected { outline: 2px solid var(--accent); outline-offset: -2px; }
.live-table .ok { color: var(--ok); }
.live-table .fail { color: var(--error); }
.live-detail { margin-top: 1rem; display: flex; flex-direction: column; gap: 0.75rem; }
.live-detail[hidden] { display: none; }
.live-detail-head { display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap; }
.live-detail-head h3 { margin: 0; }
.live-detail-head .live-close { margin-left: auto; }
.live-lesson { font-size: 0.9rem; }
.live-lesson ul { list-style: none; padding: 0; margin: 0.3rem 0 0; }
.live-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(24rem, 1fr)); gap: 0.75rem; }
.live-code, .live-terminal { display: flex; flex-direction: column; border: 1px solid var(--border); border-radius: 0.4rem; overflow: hidden; height: 28rem; }
.live-code .file-tabs { padding: 0.3rem; border-bottom: 1px solid var(--border); margin: 0; }
.live-code .editor-host { flex: 1; min-height: 0; }
.live-terminal { background: var(--term-bg); color: #e5e7eb; }
.live-terminal-bar { display: flex; align-items: center; gap: 0.75rem; padding: 0.3rem 0.5rem; font-size: 0.85rem; flex-wrap: wrap; }
.live-terminal-bar label { display: flex; align-items: center; gap: 0.3rem; }
.live-terminal-view { position: relative; flex: 1; min-height: 0; }
#live-terminal { width: 100%; height: 100%; }
.live-message-form { display: flex; gap: 0.5rem; }
.live-message-form input { flex: 1; font: inherit; padding: 0.3rem 0.5rem; }

/* --- Kind: Zuschauer-Hinweis und Nachrichten ----------------------------------- */

.watch-banner { padding: 0.15rem 0.6rem; border-radius: 999px; font-size: 0.85rem; background: #fde68a; color: #78350f; }
.watch-banner[hidden] { display: none; }
.messages { position: fixed; right: 1rem; bottom: 2rem; display: flex; flex-direction: column; gap: 0.5rem; max-width: 26rem; z-index: 10; }
.message-box { background: #fffbeb; border: 2px solid #f59e0b; border-radius: 0.5rem; padding: 0.6rem 2.2rem 0.6rem 0.8rem; position: relative; box-shadow: 0 4px 12px rgb(0 0 0 / 0.15); }
.message-box strong { display: block; margin-bottom: 0.2rem; }
.message-box p { margin: 0; white-space: pre-wrap; overflow-wrap: anywhere; }
.message-box button { position: absolute; top: 0.3rem; right: 0.3rem; padding: 0.1rem 0.45rem; background: transparent; color: #78350f; }