:root {
  --void: #0C1B3A;
  --void-2: #16305C;
  --panel: #1C3A6B;
  --sky: #35B4FF;
  --sky-deep: #1583C7;
  --sky-glow: rgba(53,180,255,0.35);
  --yellow: #F5C518;
  --yellow-light: #FFE07A;
  --yellow-deep: #C99A0E;
  --brown: #7A4E1D;
  --ivory: #F7F4EE;
  --slate: #CBDAF0;
  --line: rgba(247,244,238,0.20);
  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --font-mono: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }

body {
  background:
    radial-gradient(ellipse 900px 620px at 50% 0%,    rgba(53,180,255,0.22), transparent 62%),
    radial-gradient(ellipse 760px 560px at 12% 34%,   rgba(53,180,255,0.12), transparent 64%),
    radial-gradient(ellipse 820px 600px at 88% 62%,   rgba(245,197,24,0.075), transparent 64%),
    radial-gradient(ellipse 700px 520px at 25% 88%,   rgba(53,180,255,0.10), transparent 64%),
    linear-gradient(176deg, #0C1B3A 0%, #16305C 48%, #10254B 74%, #0C1B3A 100%);
  background-repeat: no-repeat;
  background-attachment: scroll;
  color:var(--ivory);
  font-family:var(--font-body);
  font-size:1.06rem;
  line-height:1.7;
  min-height:100vh;
  margin: 0;
  padding: 0;
}

.site-nav{
  position:sticky; top:0; z-index:400;
  background:rgba(12,27,58,0.94); backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.site-nav-inner{
  max-width:1100px; margin:0 auto;
  display:flex; align-items:center; gap:18px; flex-wrap:wrap;
  padding:12px 24px;
}
.site-nav-brand{
  font-family:var(--font-display); font-weight:700; font-size:1.05rem;
  color:var(--ivory); text-decoration:none; white-space:nowrap;
}
.site-nav-brand span{ color:var(--ivory); }
.site-nav-links{
  display:flex; align-items:center; gap:16px; flex-wrap:wrap; flex:1;
}
.site-nav-links a{
  color:var(--slate); text-decoration:none;
  font-family:var(--font-mono); font-size:0.9rem; letter-spacing:0.05em; text-transform:uppercase;
  padding:4px 2px; border-bottom:2px solid transparent; transition:color 0.2s, border-color 0.2s;
}
.site-nav-links a:hover{ color:var(--yellow); }
.site-nav-links a.active{ color:var(--yellow); border-bottom-color:var(--yellow); }
.site-nav-jump select{
  background:var(--panel); color:var(--ivory); border:1px solid var(--line); border-radius:6px;
  padding:6px 10px; font-family:var(--font-mono); font-size:1rem;
}
.site-nav-signin{ margin-left:auto; }
@media (max-width:640px){
  .site-nav-inner{ padding:10px 16px; }
  .site-nav-signin{ order:1; width:100%; justify-content:center; }
}

.lesson-wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 20px 80px;
}

.lesson-header {
  border-bottom: 1px solid var(--line);
  padding-bottom: 16px;
  margin-bottom: 20px;
}

.lesson-eyebrow {
  color: var(--yellow);
  font-family: var(--font-mono);
  font-size:16px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 6px;
}

.lesson-title {
  font-family: var(--font-display);
  font-size: 28px;
  margin: 0;
  color: var(--ivory);
}

.lesson-petal {
  color: var(--slate);
  font-size:18px;
  margin: 4px 0 0;
}

.section-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.section-nav button {
  background: var(--panel);
  color: var(--slate);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 14px;
  font-family: var(--font-body);
  font-size:17px;
  cursor: pointer;
  transition: all 0.2s var(--ease);
}

.section-nav button.active {
  background: var(--yellow);
  color: var(--void);
  border-color: var(--yellow);
  font-weight: 600;
}

.section-nav button:hover:not(.active) {
  border-color: var(--sky);
  color: var(--ivory);
}

.lesson-section {
  display: none;
  flex-direction: column;
  gap: 16px;
}

.lesson-section.active {
  display: flex;
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
}

.card h3 {
  font-family: var(--font-display);
  color: var(--yellow-light);
  margin: 0 0 10px;
  font-size: 18px;
}

.card p, .card li {
  color: var(--ivory);
  line-height: 1.6;
  font-size:19px;
}

.card ul {
  margin: 0;
  padding-left: 20px;
}

.founder-note {
  background: rgba(245,197,24,0.08);
  border: 1px dashed var(--yellow-deep);
  border-radius: 10px;
  padding: 14px 16px;
  color: var(--yellow-light);
  font-family: var(--font-mono);
  font-size:17px;
  line-height: 1.5;
}

.video-slot {
  width: 100%;
  aspect-ratio: 16/9;
  background: var(--void-2);
  border: 1px dashed var(--yellow-deep);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--slate);
  font-family: var(--font-mono);
  font-size:17px;
  text-align: center;
  padding: 20px;
}

.reflection-q {
  display: none;
}

.reflection-q.active {
  display: block;
}

.reflection-progress {
  color: var(--slate);
  font-size:16px;
  font-family: var(--font-mono);
  margin-bottom: 8px;
}

textarea {
  width: 100%;
  min-height: 90px;
  background: var(--void-2);
  color: var(--ivory);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  font-family: var(--font-body);
  font-size:18px;
  resize: vertical;
}

.btn {
  background: var(--yellow);
  color: var(--void);
  border: none;
  border-radius: 8px;
  padding: 10px 18px;
  font-weight: 600;
  font-size:18px;
  cursor: pointer;
  align-self: flex-start;
}

.btn.secondary {
  background: transparent;
  color: var(--sky);
  border: 1px solid var(--sky-deep);
}

.chat-box {
  background: var(--void-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px;
  min-height: 140px;
  color: var(--slate);
  font-size:18px;
}

.chat-msg-user {
  color: var(--ivory);
  margin-bottom: 8px;
}

.chat-msg-ai {
  color: var(--yellow-light);
  margin-bottom: 8px;
}

.vd-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}

.vd-tabs button {
  background: var(--void-2);
  color: var(--slate);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 6px 10px;
  font-size:16px;
  cursor: pointer;
}

.vd-tabs button.active {
  background: var(--sky);
  color: var(--void);
  border-color: var(--sky);
}

.vd-panel {
  display: none;
}

.vd-panel.active {
  display: block;
}

.save-status {
  font-size:16px;
  color: var(--slate);
  font-family: var(--font-mono);
}

.assignment-item {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.assignment-item:last-child {
  border-bottom: none;
}

.assignment-item input[type="checkbox"] {
  margin-top: 4px;
}

.lesson-purpose {
  color: var(--slate);
  font-size:18px;
  line-height: 1.5;
  margin: 8px 0 0;
  max-width: 640px;
}

.admin-note {
  display: none;
  background: rgba(245,197,24,0.08);
  border: 1px dashed var(--yellow-deep);
  border-radius: 10px;
  padding: 12px 14px;
  color: var(--yellow-light);
  font-family: var(--font-mono);
  font-size:16px;
  line-height: 1.5;
  margin-top: 10px;
}

body[data-admin="1"] .admin-note {
  display: block;
}

.teaching-accordion {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.teaching-toggle {
  width: 100%;
  text-align: left;
  background: var(--void-2);
  color: var(--ivory);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size:18px;
  cursor: pointer;
}

.teaching-toggle:hover {
  border-color: var(--sky);
}

.teaching-body {
  display: none;
  padding: 10px 14px 4px;
}

.teaching-item.open .teaching-body {
  display: block;
}

.required-outputs {
  margin: 10px 0;
  padding-left: 20px;
}

.required-outputs li {
  color: var(--slate);
  font-size:17px;
  line-height: 1.6;
}

.coach-subtext {
  color: var(--slate);
  font-size:17px;
  margin-top: -4px;
}

.coach-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 10px 0;
}

.coach-tab-btn {
  background: var(--void-2);
  color: var(--slate);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 7px 12px;
  font-size:16px;
  cursor: pointer;
}

.coach-tab-btn.active {
  background: var(--yellow);
  color: var(--void);
  border-color: var(--yellow-deep);
  font-weight: 600;
}

.coach-panel {
  display: none;
}

.coach-panel.active {
  display: block;
}

.chat-input-row {
  display: flex;
  gap: 8px;
  align-items: flex-end;
  margin-top: 10px;
}

.chat-input-row textarea {
  flex: 1;
  min-height: 50px;
}

.admin-field-group {
  margin-bottom: 16px;
}

.coach-float {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 50;
}

.coach-float-btn {
  background: var(--yellow);
  color: var(--void);
  border: none;
  border-radius: 999px;
  padding: 14px 20px;
  font-weight: 700;
  font-size:18px;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(0,0,0,0.4);
}

.coach-float-btn:hover {
  filter: brightness(1.08);
}

@media (max-width:700px){
  body{ overflow-x:hidden; }
  .lesson-wrap{ padding-left:18px; padding-right:18px; }
  .card, .admin-field-group{ padding-left:16px; padding-right:16px; }
}

.site-nav-logo{ display:block; height:30px; width:auto; }

.teaching-body p {
  font-size: 17px;
  line-height: 1.65;
  margin: 0 0 12px;
  max-width: 78ch;
}
.teaching-body .teach-h {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: .02em;
  margin: 22px 0 10px;
  color: var(--yellow);
}
.teaching-body .teach-ul {
  margin: 0 0 14px;
  padding-left: 22px;
  max-width: 78ch;
}
.teaching-body .teach-ul li {
  font-size: 17px;
  line-height: 1.6;
  margin-bottom: 6px;
}

.book1 .book1-toc {
  margin: 0 0 26px;
  padding-left: 20px;
}
.book1 .book1-toc li { margin-bottom: 7px; }
.book1 .book1-toc a {
  color: var(--yellow);
  font-size: 17px;
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.book1 .book1-toc a:hover { border-bottom-color: var(--yellow); }
.book1 .book1-h {
  font-family: var(--font-body);
  font-weight: 800;
  font-size: 22px;
  line-height: 1.25;
  margin: 34px 0 12px;
  color: var(--yellow);
  scroll-margin-top: 20px;
}
.book1 p {
  font-size: 17px;
  line-height: 1.7;
  margin: 0 0 14px;
  max-width: 78ch;
}
.book1 .book1-ul {
  margin: 0 0 16px;
  padding-left: 22px;
  max-width: 78ch;
}
.book1 .book1-ul li { font-size: 17px; line-height: 1.65; margin-bottom: 8px; }

.nav-btn.nav-off,
.site-nav-off {
  opacity: .38;
  cursor: not-allowed;
  pointer-events: none;
  text-decoration: line-through;
}
.site-nav-off { color: var(--slate) !important; }

.field-label {
  font-weight: 700;
  font-size: 16px;
  margin: 20px 0 6px;
  color: var(--ivory);
}