:root {
  --bg: #101217;
  --panel: #181d25;
  --panel2: #202733;
  --line: #3b4657;
  --text: #f4f7fb;
  --muted: #c9d2de;
  --hot: #ffcc66;
  --green: #70e6b2;
  --bad: #ff9b8f;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: Arial, Helvetica, sans-serif; color: var(--text); background: radial-gradient(circle at 50% -120px, rgba(255,204,102,.08), transparent 360px), linear-gradient(180deg, #101217 0%, #151b25 100%); min-height: 100vh; overflow-x: hidden; }
a { color: var(--hot); font-weight: 900; text-decoration: none; }
a:hover { text-decoration: underline; }
.page { width: min(1240px, calc(100vw - 32px)); margin: 0 auto; padding: 22px 0 72px; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 18px; flex-wrap: wrap; margin-bottom: 24px; padding: 14px 16px; border: 1px solid rgba(255,255,255,.1); border-radius: 8px; background: rgba(24,29,37,.94); box-shadow: 0 16px 42px rgba(0,0,0,.18); }
.brand-block { display: flex; align-items: center; gap: 14px; }
.brand-logo { width: 64px; height: 64px; object-fit: contain; }
.eyebrow, .kicker { color: var(--hot); font-weight: 900; letter-spacing: .11em; text-transform: uppercase; font-size: .82rem; }
.brand { font-size: clamp(1.42rem, 2.2vw, 2.05rem); font-weight: 950; line-height: 1; }
.topbar-right, .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 10px; flex-wrap: wrap; }
.nav-links a { min-height: 52px; padding: 11px 16px; border-radius: 16px; border: 1px solid var(--line); background: rgba(255,255,255,.06); color: var(--text); display: inline-flex; align-items: center; gap: 10px; line-height: 1; }
.nav-links a.is-active { border-color: rgba(255,255,255,.42); background: rgba(255,255,255,.16); box-shadow: inset 0 0 0 1px rgba(255,255,255,.12), 0 10px 24px rgba(0,0,0,.16); }
.nav-icon { width: 24px; height: 24px; flex: 0 0 24px; object-fit: contain; }
.nav-icon-hosting-disabled { width: 27px; height: 27px; flex-basis: 27px; }
.nav-account-icon { width: 34px; height: 34px; flex: 0 0 34px; border-radius: 999px; border: 1px solid rgba(255,255,255,.24); background: radial-gradient(circle at 50% 34%, rgba(255,255,255,.96) 0 17%, transparent 18%), radial-gradient(circle at 50% 78%, rgba(255,255,255,.92) 0 27%, transparent 28%), linear-gradient(135deg, rgba(245,182,66,.95), rgba(56,189,248,.9)); }
.hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(280px, 380px); gap: 18px; align-items: stretch; margin-bottom: 20px; padding: 26px; border: 1px solid var(--line); border-radius: 8px; background: linear-gradient(180deg, rgba(32,39,51,.92), rgba(24,29,37,.96)); box-shadow: 0 18px 44px rgba(0,0,0,.2); }
h1 { font-size: clamp(2.25rem, 4.8vw, 4.6rem); line-height: .96; margin: 12px 0; letter-spacing: 0; max-width: 860px; }
h2 { margin: 0 0 12px; font-size: clamp(1.5rem, 2.6vw, 2.4rem); line-height: 1; }
h3 { margin: 0 0 8px; }
p, li { color: var(--muted); line-height: 1.62; }
.subhead { font-size: clamp(1.05rem, 2vw, 1.35rem); max-width: 820px; }
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; margin-top: 18px; }
.btn, button { min-height: 44px; padding: 11px 14px; border-radius: 8px; border: 1px solid rgba(255,204,102,.55); background: linear-gradient(135deg, rgba(255,204,102,.22), rgba(255,122,69,.16)); color: var(--text); font-weight: 900; cursor: pointer; }
.btn.secondary, button.secondary { border-color: var(--line); background: rgba(255,255,255,.06); }
button:disabled { opacity: .55; cursor: not-allowed; }
.notice, .panel, .small-card, .course-card, .module-card { border: 1px solid var(--line); border-radius: 8px; background: linear-gradient(180deg, rgba(26,31,41,.98), rgba(16,20,28,.99)); padding: 16px; box-shadow: 0 12px 30px rgba(0,0,0,.18); }
.notice { border-left: 4px solid var(--green); }
.notice.error { border-left-color: var(--bad); }
.reader-safety-note { display: inline-block; margin-top: 10px; padding: 12px 14px; border: 1px solid rgba(255,204,102,.38); border-left: 5px solid var(--hot); border-radius: 8px; background: rgba(255,204,102,.08); color: #f4e6c7; font-weight: 850; }
.layout { display: block; }
.sidebar { position: sticky; top: 16px; display: grid; gap: 12px; min-width: 0; }
.course-list { display: grid; gap: 10px; max-height: calc(100vh - 220px); overflow: auto; padding-right: 4px; }
.course-card { text-align: left; width: 100%; border-color: rgba(255,255,255,.16); cursor: pointer; transition: border-color .16s ease, background .16s ease, box-shadow .16s ease, transform .16s ease; }
.course-card:hover, .course-card:focus-visible { border-color: rgba(255,204,102,.46); background: linear-gradient(180deg, rgba(31,38,50,.98), rgba(18,23,32,.99)); box-shadow: 0 16px 34px rgba(0,0,0,.24); transform: translateY(-1px); }
.course-card.is-active { border-color: var(--hot); box-shadow: 0 0 0 1px rgba(255,204,102,.22); }
.badge { display: inline-flex; align-items: center; border: 1px solid var(--line); border-radius: 999px; padding: 4px 8px; margin: 0; color: var(--muted); font-size: .82rem; line-height: 1.25; }
.progress { height: 10px; background: rgba(255,255,255,.08); border-radius: 999px; overflow: hidden; margin: 8px 0; }
.progress span { display: block; height: 100%; background: linear-gradient(90deg, var(--green), var(--hot)); }
.reader { min-width: 0; }
.reader > .panel { max-width: none; margin-left: 0; margin-right: 0; }
.course-player-shell { display: grid; gap: 16px; }
.course-header-panel { display: grid; grid-template-columns: minmax(0, 1fr) minmax(260px, 320px); gap: 16px; align-items: stretch; border: 1px solid var(--line); border-radius: 8px; background: linear-gradient(180deg, rgba(31,38,50,.98), rgba(15,19,27,.98)); padding: 20px; box-shadow: 0 18px 44px rgba(0,0,0,.22); }
.course-header-panel.compact h2 { font-size: clamp(1.8rem, 3vw, 2.8rem); }
.progress-panel { border: 1px solid rgba(255,255,255,.14); border-radius: 8px; background: rgba(255,255,255,.045); padding: 14px; display: flex; flex-direction: column; gap: 9px; }
.lesson-player-grid { display: grid; grid-template-columns: minmax(240px, 300px) minmax(0, 1fr); gap: 16px; align-items: start; }
.lesson-sidebar { position: sticky; top: 16px; display: grid; gap: 10px; }
.course-outline { display: grid; gap: 8px; border: 1px solid var(--line); border-radius: 8px; background: rgba(10,13,18,.74); padding: 10px; }
.outline-module { border: 1px solid rgba(255,255,255,.1); border-radius: 8px; overflow: hidden; background: rgba(255,255,255,.035); }
.outline-module summary { cursor: pointer; display: flex; justify-content: space-between; gap: 10px; padding: 10px; color: var(--text); font-weight: 900; }
.outline-lessons { display: grid; gap: 4px; padding: 0 8px 8px; }
.outline-lessons button, .outline-final { text-align: left; min-height: 36px; padding: 8px 10px; border-color: rgba(255,255,255,.1); background: rgba(255,255,255,.04); }
.outline-lessons button.is-current { border-color: var(--hot); background: rgba(255,204,102,.12); }
.mobile-outline-label { display: none; color: var(--hot); font-weight: 900; text-transform: uppercase; letter-spacing: .08em; font-size: .82rem; }
.module-grid { display: grid; gap: 12px; }
.module-card { margin-top: 12px; box-shadow: 0 12px 28px rgba(0,0,0,.14); }
.lesson-row { display: flex; justify-content: space-between; gap: 10px; align-items: center; padding: 10px 0; border-top: 1px solid rgba(255,255,255,.08); }
.lesson-actions { display: flex; gap: 10px; flex-wrap: wrap; justify-content: flex-end; align-items: center; }
.official-lesson { display: grid; gap: 14px; min-width: 0; }
.lesson-section { border: 1px solid rgba(255,255,255,.12); border-radius: 8px; background: linear-gradient(180deg, rgba(24,29,38,.98), rgba(13,17,24,.98)); padding: 16px; max-width: 82ch; }
.lesson-section h3 { color: var(--text); margin-bottom: 8px; }
.lesson-section div { color: var(--muted); line-height: 1.72; }
.term-row { display: flex; flex-wrap: wrap; gap: 8px; }
.lesson-section.official { border-left: 4px solid var(--green); }
.lesson-section.caution { border-left: 4px solid var(--hot); background: linear-gradient(180deg, rgba(52,37,18,.72), rgba(18,17,15,.98)); }
.safety-ack-panel { border: 1px solid rgba(255,204,102,.38); border-left: 6px solid var(--hot); border-radius: 8px; background: linear-gradient(180deg, rgba(55,40,18,.68), rgba(18,20,26,.98)); padding: 16px; box-shadow: 0 14px 30px rgba(0,0,0,.2); }
.safety-ack-panel.compact { padding: 14px; }
.safety-ack-panel h3, .safety-ack-panel p { margin: 0 0 10px; }
.safety-ack-panel p { color: #f1e6d1; }
.safety-ack-panel.needs-ack { outline: 3px solid rgba(255,204,102,.62); }
.safety-ack-panel.is-accepted { border-color: rgba(112,230,178,.36); border-left-color: #70e6b2; background: linear-gradient(180deg, rgba(20,45,34,.58), rgba(18,20,26,.98)); }
.ack-accepted { color: #d8f7e8 !important; }
.reader-ack-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 12px; }
.reader-ack-actions button:disabled { opacity: .58; cursor: not-allowed; }
.ack-help { color: var(--muted); font-size: 13px; }
.reader-ack-box { display: flex; gap: 10px; align-items: flex-start; padding: 12px; border: 1px solid rgba(255,255,255,.16); border-radius: 8px; background: rgba(255,255,255,.055); color: var(--text); font-weight: 850; line-height: 1.45; }
.reader-ack-box input { width: 20px; height: 20px; flex: 0 0 auto; margin-top: 2px; accent-color: var(--hot); }
.reader-protection-notice { border: 1px solid rgba(255,204,102,.28); border-left: 4px solid var(--hot); border-radius: 8px; background: rgba(255,204,102,.07); padding: 12px 14px; color: #f1e6d1; line-height: 1.5; }
.reader-protection-notice strong { color: var(--text); }
.reader-watermark { display: inline-flex; width: fit-content; max-width: 100%; margin: 0 0 10px; padding: 5px 9px; border: 1px solid rgba(255,255,255,.14); border-radius: 999px; background: rgba(255,255,255,.055); color: rgba(244,247,251,.76); font-size: .78rem; font-weight: 850; letter-spacing: .02em; overflow-wrap: anywhere; }
.protected-content { position: relative; }
.official-lesson.protected-content, .assessment-shell.protected-content, .certificate-flow.protected-content { user-select: none; -webkit-user-select: none; }
.official-lesson.protected-content input, .official-lesson.protected-content button, .assessment-shell.protected-content input, .assessment-shell.protected-content button, .certificate-flow.protected-content a, .certificate-flow.protected-content button { user-select: auto; -webkit-user-select: auto; }
.protected-content::after { content: attr(data-watermark); position: absolute; right: 12px; bottom: 8px; pointer-events: none; color: rgba(244,247,251,.12); font-size: .78rem; font-weight: 900; letter-spacing: .04em; max-width: min(70%, 520px); text-align: right; overflow-wrap: anywhere; }
.lesson-nav-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-top: 4px; }
.simulated { border: 1px solid rgba(255,204,102,.34); border-radius: 8px; background: #0b0e13; padding: 14px; margin: 14px 0; color: #e6edf3; overflow-x: auto; user-select: none; -webkit-user-select: none; }
.simulated strong { display: block; font-family: Arial, Helvetica, sans-serif; margin-bottom: 10px; }
.simulated pre { margin: 10px 0 0; white-space: pre-wrap; font-family: monospace; line-height: 1.55; }
.simulated-caption { color: var(--hot); font-weight: 900; font-family: Arial, Helvetica, sans-serif; margin-bottom: 8px; }
.panel-checklist p { margin: 8px 0 10px; color: var(--muted); font-family: Arial, Helvetica, sans-serif; }
.panel-checklist ul { display: grid; gap: 8px; margin: 10px 0 0; padding: 0; list-style: none; }
.panel-checklist li { position: relative; padding-left: 28px; color: #e6edf3; font-family: Arial, Helvetica, sans-serif; }
.panel-checklist li::before { content: ""; position: absolute; left: 0; top: .35em; width: 14px; height: 14px; border: 2px solid var(--green); border-radius: 4px; background: rgba(112,230,178,.08); }
.checkpoint-card, .command-lab { display: grid; gap: 14px; border: 1px solid rgba(255,204,102,.34); border-left: 5px solid var(--hot); border-radius: 8px; background: linear-gradient(180deg, rgba(31,34,42,.98), rgba(14,17,24,.99)); padding: 16px; max-width: 82ch; }
.command-lab { border-color: rgba(112,230,178,.3); border-left-color: var(--green); background: linear-gradient(180deg, rgba(18,38,32,.72), rgba(14,17,24,.99)); }
.checkpoint-heading { display: flex; justify-content: space-between; gap: 14px; align-items: flex-start; }
.checkpoint-heading h3, .checkpoint-heading p { margin: 0 0 8px; }
.checkpoint-status { flex: 0 0 auto; border: 1px solid rgba(255,255,255,.18); border-radius: 999px; padding: 5px 9px; color: var(--text); font-size: .8rem; font-weight: 900; white-space: nowrap; }
.checkpoint-status.is-passed { border-color: rgba(112,230,178,.5); color: var(--green); }
.checkpoint-status.needs-retry { border-color: rgba(255,204,102,.5); color: var(--hot); }
.checkpoint-form, .command-lab-form { display: grid; gap: 12px; }
.checkpoint-question { border: 1px solid rgba(255,255,255,.13); border-radius: 8px; padding: 12px; margin: 0; background: rgba(255,255,255,.04); }
.checkpoint-question legend { color: var(--text); font-weight: 900; line-height: 1.4; padding: 0 4px; }
.checkpoint-question label, .command-lab-form label, .risk-checklist label { display: flex; gap: 10px; align-items: flex-start; color: var(--muted); line-height: 1.45; margin: 9px 0; }
.checkpoint-question input, .risk-checklist input { flex: 0 0 auto; margin-top: .22em; accent-color: var(--hot); }
.command-lab-form textarea, .command-lab-form input[type="text"], .command-lab-form input:not([type]) { width: 100%; margin-top: 7px; border: 1px solid var(--line); border-radius: 8px; background: rgba(4,7,12,.8); color: var(--text); padding: 11px 12px; font: inherit; line-height: 1.45; }
.command-lab-form textarea { resize: vertical; min-height: 96px; }
.command-lab-form > label { display: grid; gap: 4px; font-weight: 850; color: var(--text); }
.risk-checklist { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px 12px; padding: 10px; border: 1px solid rgba(255,255,255,.11); border-radius: 8px; background: rgba(255,255,255,.035); }
.checkpoint-result, .command-lab-result { min-height: 20px; color: var(--muted); line-height: 1.55; }
.lab-result-card { border: 1px solid rgba(255,255,255,.16); border-radius: 8px; padding: 12px; background: rgba(255,255,255,.045); }
.lab-result-card.is-passed { border-left: 4px solid var(--green); }
.lab-result-card.needs-retry { border-left: 4px solid var(--hot); }
.lab-result-card p { margin: 8px 0 0; }
.assessment-shell, .certificate-flow { display: grid; gap: 14px; max-width: 900px; margin: 0 auto; }
.quiz-question { border-top: 1px solid rgba(255,255,255,.08); padding: 12px 0; }
.question-number { color: var(--hot); font-weight: 900; text-transform: uppercase; letter-spacing: .08em; font-size: .8rem; margin-bottom: 6px; }
.quiz-question label { display: block; margin: 8px 0; color: var(--muted); }
.assessment-result p { margin: 8px 0; }
.requirement-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.requirement-grid div { border: 1px solid var(--line); border-radius: 8px; padding: 12px; background: rgba(255,255,255,.045); color: var(--muted); font-weight: 800; }
.certificate-card { border-color: rgba(112,230,178,.32); }
.mini { color: var(--muted); font-size: .92rem; margin: 0; }
.empty-mini { border: 1px dashed rgba(255,255,255,.18); border-radius: 8px; padding: 14px; background: rgba(255,255,255,.04); display: grid; gap: 10px; }
.empty-mini p { margin: 6px 0 10px; }
.dashboard-stack { display: grid; gap: 18px; }
.dashboard-hero-card, .dashboard-section, .access-explainer { border: 1px solid var(--line); border-radius: 8px; background: linear-gradient(180deg, rgba(30,36,48,.96), rgba(20,25,34,.98)); padding: 18px; box-shadow: 0 12px 28px rgba(0,0,0,.16); }
.dashboard-hero-card { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 18px; align-items: center; }
.dashboard-hero-card h2 { margin-bottom: 8px; }
.hero-actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 12px; align-items: center; }
.status-pill { border-color: rgba(112,230,178,.45); color: var(--green); }
.section-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.section-heading h3 { font-size: 1.28rem; margin: 0; }
.section-heading span { color: var(--muted); font-size: .92rem; font-weight: 800; }
.dashboard-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.locked-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.dashboard-card { border: 1px solid rgba(255,255,255,.16); border-radius: 8px; background: linear-gradient(180deg, rgba(20,25,34,.98), rgba(13,17,24,.98)); padding: 18px; display: flex; flex-direction: column; gap: 12px; min-width: 0; box-shadow: inset 0 1px 0 rgba(255,255,255,.035), 0 14px 32px rgba(0,0,0,.20); transition: border-color .16s ease, box-shadow .16s ease, transform .16s ease; }
.dashboard-card:hover, .dashboard-card:focus-within { border-color: rgba(255,204,102,.34); box-shadow: inset 0 1px 0 rgba(255,255,255,.045), 0 18px 38px rgba(0,0,0,.26); transform: translateY(-1px); }
.dashboard-card h3, .dashboard-card p { margin: 0; }
.dashboard-card h3 { line-height: 1.22; }
.dashboard-card p { line-height: 1.58; }
.card-topline, .card-badges { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.card-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-top: auto; padding-top: 2px; }
.card-actions .btn, .card-actions button, .hero-actions .btn, .cta-row .btn, .cta-row button, .empty-mini .btn, .empty-state .btn { display: inline-flex; align-items: center; justify-content: center; text-align: center; }
.resume-strong { border-color: rgba(255,204,102,.38); background: rgba(255,204,102,.07); }
.empty-state { border: 1px dashed rgba(255,255,255,.18); border-radius: 8px; padding: 18px; background: rgba(255,255,255,.035); display: grid; gap: 10px; }
.empty-state.compact { padding: 14px; }
.empty-state p { margin: 0; }
.scheduled-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.scheduled-card { border-style: dashed; }
.access-explainer { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; color: var(--muted); font-weight: 800; }
.access-explainer span { border-left: 3px solid rgba(255,204,102,.55); padding-left: 10px; }
@media (max-width: 880px) {
  .page { width: min(100% - 24px, 1240px); padding-top: 14px; }
  .hero, .layout { grid-template-columns: 1fr; }
  .hero { padding: 18px; }
  .sidebar { position: static; }
  .course-list { max-height: none; }
  .lesson-row { align-items: stretch; flex-direction: column; }
  .lesson-actions { justify-content: flex-start; }
  .nav-links { justify-content: flex-start; }
  .dashboard-hero-card, .dashboard-grid, .locked-grid, .scheduled-row, .access-explainer { grid-template-columns: 1fr; }
  .course-header-panel, .lesson-player-grid, .requirement-grid { grid-template-columns: 1fr; }
  .lesson-sidebar { position: static; }
  .mobile-outline-label { display: block; }
  .hero-actions { justify-content: flex-start; }
  .hero-actions .btn, .card-actions .btn, .card-actions button, .cta-row .btn, .cta-row button { width: 100%; }
  .checkpoint-heading { display: grid; }
  .checkpoint-status { width: fit-content; }
  .risk-checklist { grid-template-columns: 1fr; }
}
@media print {
  body::before { content: "TDS LearnAI private course material - personal use only"; position: fixed; top: 12px; left: 12px; right: 12px; z-index: 9999; padding: 8px 12px; border: 1px solid #333; background: #fff; color: #111; font: 700 12px Arial, sans-serif; }
  .protected-content::after { color: rgba(0,0,0,.22); right: 18px; bottom: 18px; }
  .reader-protection-notice, .reader-watermark { color: #111; border-color: #333; background: #fff; }
}