/* ─── Reset & Base ─────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg:         #0a0a0f;
  --bg-card:    #13131a;
  --bg-hover:   #1a1a24;
  --accent:     #7c6ff7;
  --accent-dim: #5a50d4;
  --accent-glow:rgba(124, 111, 247, 0.25);
  --text:       #e8e8f0;
  --text-muted: #8888a8;
  --border:     #2a2a3a;
  --radius:     12px;
  --nav-h:      64px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans KR', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

/* ─── Layout helpers ────────────────────────────────────── */
.section-inner,
.nav-inner,
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 100px 0;
}

/* ─── Navbar ────────────────────────────────────────────── */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  border-bottom: 1px solid transparent;
  transition: background 0.3s, border-color 0.3s;
}

#navbar.scrolled {
  background: rgba(10, 10, 15, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-color: var(--border);
}

.nav-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.5px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-menu a {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--text-muted);
  transition: color 0.2s;
}

.nav-menu a:hover {
  color: var(--text);
}

.nav-menu .nav-cta {
  background: var(--accent);
  color: #fff;
  padding: 8px 18px;
  border-radius: 8px;
  font-weight: 500;
  transition: background 0.2s, transform 0.15s;
}

.nav-menu .nav-cta:hover {
  background: var(--accent-dim);
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}

/* ─── Hero ──────────────────────────────────────────────── */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 0;
}

.hero-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: calc(var(--nav-h) + 60px) 24px 80px;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--accent);
  background: rgba(124, 111, 247, 0.12);
  border: 1px solid rgba(124, 111, 247, 0.3);
  border-radius: 100px;
  padding: 5px 14px;
  margin-bottom: 28px;
  letter-spacing: 0.3px;
}

.hero-title {
  font-size: clamp(2.6rem, 6vw, 4.8rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 16px;
}

.hero-title .highlight {
  color: var(--accent);
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-weight: 300;
  color: var(--text-muted);
  margin-bottom: 20px;
  letter-spacing: 0.2px;
}

.hero-desc {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 480px;
  margin-bottom: 40px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ─── Buttons ───────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s, background 0.2s;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 24px var(--accent-glow);
}

.btn-primary:hover {
  background: var(--accent-dim);
  transform: translateY(-2px);
  box-shadow: 0 4px 32px var(--accent-glow);
}

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

.btn-secondary:hover {
  background: var(--bg-hover);
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* ─── Hero glow bg ──────────────────────────────────────── */
.hero-glow {
  position: absolute;
  top: 10%;
  left: -10%;
  width: 70vw;
  height: 70vw;
  max-width: 800px;
  max-height: 800px;
  background: radial-gradient(circle, rgba(124, 111, 247, 0.12) 0%, transparent 65%);
  pointer-events: none;
  z-index: 0;
}

/* ─── Section common ────────────────────────────────────── */
.section-label {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.8px;
  margin-bottom: 48px;
}

/* Alternate section backgrounds */
#about      { background: var(--bg); }
#curriculum { background: var(--bg-card); }
#instructor { background: var(--bg); }
#faq        { background: var(--bg-card); }
#enroll     { background: var(--bg); }

/* ─── Footer ────────────────────────────────────────────── */
#footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
}

.footer-copy {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ─── Path Cards ────────────────────────────────────────── */
#paths {
  background: var(--bg-card);
}

.path-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.path-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 36px 32px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--bg);
  cursor: pointer;
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
}

.path-card:hover {
  transform: translateY(-3px);
}

/* Green variant */
.path-card--green {
  --card-accent: #4ade80;
  --card-glow: rgba(74, 222, 128, 0.18);
}

.path-card--green:hover {
  border-color: var(--card-accent);
  box-shadow: 0 8px 32px var(--card-glow);
}

/* Purple variant */
.path-card--purple {
  --card-accent: #7c6ff7;
  --card-glow: rgba(124, 111, 247, 0.22);
}

.path-card--purple:hover {
  border-color: var(--card-accent);
  box-shadow: 0 8px 32px var(--card-glow);
}

.path-card__emoji {
  font-size: 2.2rem;
  line-height: 1;
}

.path-card__accent-line {
  width: 40px;
  height: 3px;
  background: var(--card-accent);
  border-radius: 2px;
}

.path-card__title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.4px;
  color: var(--text);
}

.path-card__desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.75;
  flex: 1;
}

.path-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
}

.path-card__tags li {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--card-accent);
  background: color-mix(in srgb, var(--card-accent) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--card-accent) 30%, transparent);
  border-radius: 100px;
  padding: 4px 12px;
}

.path-card__tags .tag--coming {
  color: var(--text-muted);
  background: transparent;
  border-color: var(--border);
}

.path-card__cta {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--card-accent);
  margin-top: 4px;
  transition: letter-spacing 0.2s;
}

.path-card:hover .path-card__cta {
  letter-spacing: 0.3px;
}

@media (max-width: 640px) {
  .path-cards {
    grid-template-columns: 1fr;
  }
}

/* ─── Curriculum Tabs ───────────────────────────────────── */
#curriculum {
  background: var(--bg);
}

.cur-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0;
}

.cur-tab {
  position: relative;
  bottom: -1px;
  padding: 10px 22px;
  background: none;
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: 8px 8px 0 0;
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.2s, background 0.2s;
}

.cur-tab:hover {
  color: var(--text);
  background: var(--bg-hover);
}

.cur-tab.active {
  color: var(--text);
  background: var(--bg);
  border-color: var(--border);
  border-bottom-color: var(--bg);
}

.cur-panel {
  display: none;
}

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

/* ─── Accordion ─────────────────────────────────────────── */
.accordion-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.accordion {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-card);
  transition: border-color 0.2s;
}

.accordion.open {
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
}

.accordion__head {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  transition: background 0.15s;
}

.accordion__head:hover {
  background: var(--bg-hover);
}

.accordion__meta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  min-width: 80px;
}

.acc-module {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 1px;
}

.acc-badge {
  font-size: 0.68rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 100px;
  letter-spacing: 0.3px;
}

.acc-badge--free {
  background: rgba(74, 222, 128, 0.15);
  color: #4ade80;
  border: 1px solid rgba(74, 222, 128, 0.3);
}

.acc-badge--core {
  background: rgba(124, 111, 247, 0.15);
  color: var(--accent);
  border: 1px solid rgba(124, 111, 247, 0.3);
}

.acc-badge--project {
  background: rgba(251, 191, 36, 0.12);
  color: #fbbf24;
  border: 1px solid rgba(251, 191, 36, 0.3);
}

.acc-badge--advanced {
  background: rgba(249, 115, 22, 0.12);
  color: #f97316;
  border: 1px solid rgba(249, 115, 22, 0.3);
}

.accordion__title {
  flex: 1;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.2px;
  cursor: pointer;
  transition: color 0.2s;
}

.accordion__title:hover {
  color: var(--primary);
}

.accordion__right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.acc-count {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.acc-icon {
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  transition: transform 0.28s ease;
  flex-shrink: 0;
}

.accordion.open .acc-icon {
  transform: rotate(180deg);
}

/* Accordion body */
.accordion__body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.3s ease;
}

.accordion.open .accordion__body {
  grid-template-rows: 1fr;
}

.accordion__body > * {
  overflow: hidden;
}

/* Lecture list */
.lecture-list {
  list-style: none;
  padding: 0 24px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.lecture-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 8px;
  border-radius: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  transition: background 0.15s, color 0.15s;
}

.lecture-item:hover {
  background: var(--bg-hover);
  color: var(--text);
}

.lecture-item--free {
  color: var(--text);
}

.lecture-item--locked {
  opacity: 0.55;
}

.lecture-item--locked .lec-link {
  cursor: default;
  pointer-events: none;
}

.lec-badge--soon {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 2px 8px;
}

/* ─── Dev Coming Banner ──────────────────────────────────── */
.dev-coming-banner {
  display: flex;
  align-items: center;
  gap: 16px;
  background: rgba(139, 92, 246, 0.07);
  border: 1px solid rgba(139, 92, 246, 0.22);
  border-radius: 12px;
  padding: 14px 20px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.dev-coming-badge {
  font-size: 0.78rem;
  font-weight: 700;
  color: #a78bfa;
  background: rgba(167, 139, 250, 0.12);
  border: 1px solid rgba(167, 139, 250, 0.3);
  border-radius: 100px;
  padding: 4px 12px;
  white-space: nowrap;
}

.dev-coming-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  flex: 1;
  min-width: 180px;
}

.lec-icon {
  font-size: 0.75rem;
  width: 18px;
  flex-shrink: 0;
  text-align: center;
}

.lec-title {
  flex: 1;
}

.lec-badge {
  font-size: 0.68rem;
  font-weight: 600;
  color: #4ade80;
  background: rgba(74, 222, 128, 0.1);
  border: 1px solid rgba(74, 222, 128, 0.25);
  border-radius: 100px;
  padding: 2px 8px;
}

/* ─── Coming Soon ────────────────────────────────────────── */
.coming-soon {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 72px 24px;
  border: 1px dashed var(--border);
  border-radius: 16px;
  gap: 16px;
}

.coming-soon__icon {
  font-size: 2.8rem;
}

.coming-soon__title {
  font-size: 1.4rem;
  font-weight: 700;
}

.coming-soon__desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.8;
  max-width: 420px;
}

/* ─── Features ──────────────────────────────────────────── */
#features {
  background: var(--bg-card);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  padding: 28px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  transition: border-color 0.2s, transform 0.2s;
}

.feature-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.feature-icon {
  font-size: 1.8rem;
  display: block;
  margin-bottom: 14px;
}

.feature-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.2px;
}

.feature-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.75;
}

@media (max-width: 900px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
  .feature-grid { grid-template-columns: 1fr; }
}

/* ─── Roadmap / Timeline ─────────────────────────────────── */
#roadmap {
  background: var(--bg);
}

.timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0;
}

/* vertical line */
.timeline::before {
  content: '';
  position: absolute;
  left: 56px;
  top: 24px;
  bottom: 24px;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), color-mix(in srgb, var(--accent) 20%, transparent));
}

.timeline-item {
  display: flex;
  gap: 28px;
  padding-bottom: 40px;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-marker {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
  width: 56px;
  padding-top: 4px;
}

.timeline-week {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.5px;
}

.timeline-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 20%, transparent);
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.timeline-card {
  flex: 1;
  padding: 24px 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  transition: border-color 0.2s;
}

.timeline-card:hover {
  border-color: color-mix(in srgb, var(--accent) 50%, var(--border));
}

.timeline-modules {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.tl-tag {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 100px;
  letter-spacing: 0.5px;
}

.tl-tag--free    { background: rgba(74,222,128,.15); color:#4ade80; border:1px solid rgba(74,222,128,.3); }
.tl-tag--core    { background: rgba(124,111,247,.15); color:var(--accent); border:1px solid rgba(124,111,247,.3); }
.tl-tag--project { background: rgba(251,191,36,.12); color:#fbbf24; border:1px solid rgba(251,191,36,.3); }
.tl-tag--advanced{ background: rgba(249,115,22,.12); color:#f97316; border:1px solid rgba(249,115,22,.3); }

.timeline-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.2px;
}

.timeline-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 14px;
}

.timeline-checks {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.timeline-checks li {
  font-size: 0.82rem;
  color: var(--text-muted);
}

@media (max-width: 600px) {
  .timeline::before { left: 44px; }
  .timeline-marker  { width: 44px; }
  .timeline-item    { gap: 16px; }
  .timeline-card    { padding: 18px 20px; }
}

/* ─── Enroll ─────────────────────────────────────────────── */
#enroll {
  background: var(--bg-card);
}

.enroll-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.enroll-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 24px;
}

.enroll-perks {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.enroll-perks li {
  font-size: 0.9rem;
  color: var(--text);
}

.enroll-form-wrap {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 36px 32px;
}

.enroll-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.enroll-input-row {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
}

.enroll-input {
  flex: 1;
  min-width: 0;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.9rem;
  color: var(--text);
  outline: none;
  transition: border-color 0.2s;
}

.enroll-input::placeholder { color: var(--text-muted); }
.enroll-input:focus { border-color: var(--accent); }
.enroll-input--error { border-color: #f87171 !important; }

.enroll-btn { white-space: nowrap; }

.enroll-error {
  font-size: 0.78rem;
  color: #f87171;
  margin: 6px 0 0;
}

.enroll-privacy {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* 신청 완료 상태 */
.enroll-success {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 10px;
  padding: 16px 0;
}

.enroll-success__icon { font-size: 2.4rem; }
.enroll-success__msg  { font-size: 1.3rem; font-weight: 700; }
.enroll-success__sub  { font-size: 0.88rem; color: var(--text-muted); }

@media (max-width: 820px) {
  .enroll-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 480px) {
  .enroll-input-row { flex-direction: column; }
  .enroll-btn       { width: 100%; }
  .enroll-form-wrap { padding: 24px 20px; }
}

/* ─── Lecture link (index.html) ─────────────────────────── */
.lec-link {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  color: inherit;
  text-decoration: none;
}

.lec-link:hover .lec-title {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ─── Module page: progress bar ─────────────────────────── */
.mod-progress-wrap {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}

.mod-progress-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.mod-progress-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
}

.mod-progress-bar {
  flex: 1;
  height: 6px;
  background: var(--border);
  border-radius: 100px;
  overflow: hidden;
}

.mod-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #a78bfa);
  border-radius: 100px;
  transition: width 0.6s ease;
}

/* ─── Module page: hero ──────────────────────────────────── */
.mod-hero {
  padding: calc(var(--nav-h) + 56px) 0 56px;
  background: var(--bg);
}

.mod-hero-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.mod-badge-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}

.mod-num-badge {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 4px 12px;
  border-radius: 100px;
  background: rgba(74, 222, 128, 0.15);
  color: #4ade80;
  border: 1px solid rgba(74, 222, 128, 0.3);
}

.mod-num-badge--core {
  background: rgba(124, 111, 247, 0.15);
  color: var(--accent);
  border-color: rgba(124, 111, 247, 0.3);
}

.mod-num-badge--project {
  background: rgba(251, 191, 36, 0.12);
  color: #fbbf24;
  border-color: rgba(251, 191, 36, 0.3);
}

.mod-num-badge--advanced {
  background: rgba(249, 115, 22, 0.12);
  color: #f97316;
  border-color: rgba(249, 115, 22, 0.3);
}

.mod-dev-badge {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  padding: 4px 12px;
  border-radius: 100px;
  background: rgba(139, 92, 246, 0.15);
  color: #a78bfa;
  border: 1px solid rgba(139, 92, 246, 0.3);
}

.mod-free-badge {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  padding: 4px 12px;
  border-radius: 100px;
  background: rgba(124, 111, 247, 0.15);
  color: var(--accent);
  border: 1px solid rgba(124, 111, 247, 0.3);
}

.mod-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 900;
  letter-spacing: -1px;
  margin-bottom: 12px;
  line-height: 1.2;
}

.mod-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.75;
  max-width: 560px;
}

/* ─── Module page: objectives ────────────────────────────── */
.mod-objectives {
  padding: 48px 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.mod-objectives-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.mod-objectives-title {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 24px;
}

.mod-obj-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.mod-obj-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 20px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.mod-obj-icon {
  font-size: 1.4rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.mod-obj-text {
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.65;
}

.mod-obj-text strong {
  display: block;
  font-weight: 700;
  margin-bottom: 4px;
}

/* ─── Module page: lecture cards ─────────────────────────── */
.mod-lectures {
  padding: 64px 0;
  background: var(--bg);
}

.mod-lectures-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.lec-card {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--bg-card);
  overflow: hidden;
  transition: border-color 0.2s;
}

.lec-card:hover {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
}

.lec-card__head {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 28px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.lec-card__num {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 1px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px 10px;
  flex-shrink: 0;
}

.lec-card__title {
  flex: 1;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.2px;
}

.lec-card__free {
  font-size: 0.7rem;
  font-weight: 600;
  color: #4ade80;
  background: rgba(74, 222, 128, 0.12);
  border: 1px solid rgba(74, 222, 128, 0.28);
  border-radius: 100px;
  padding: 3px 10px;
  flex-shrink: 0;
}

.lec-card__body {
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.lec-card__desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.8;
}

.lec-card__point {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: rgba(124, 111, 247, 0.07);
  border: 1px solid rgba(124, 111, 247, 0.2);
  border-radius: var(--radius);
  padding: 14px 18px;
}

.lec-card__point-icon {
  font-size: 1rem;
  flex-shrink: 0;
  margin-top: 1px;
}

.lec-card__point-text {
  font-size: 0.875rem;
  color: var(--text);
  line-height: 1.65;
}

.lec-card__point-text strong {
  color: var(--accent);
  font-weight: 600;
}

/* Prompt card */
.prompt-card {
  background: #0d0d15;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.prompt-card__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
}

.prompt-card__label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.prompt-copy-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
  font-family: inherit;
  font-size: 0.72rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}

.prompt-copy-btn:hover {
  color: var(--text);
  border-color: var(--accent);
}

.prompt-copy-btn.copied {
  color: #4ade80;
  border-color: #4ade80;
}

.prompt-card__text {
  padding: 18px 20px;
  font-size: 0.85rem;
  color: #c8c8e0;
  line-height: 1.8;
  white-space: pre-wrap;
  font-family: 'Noto Sans KR', monospace;
}

/* Prompt card — terminal (green) */
.prompt-card--terminal {
  border-color: #1a3a2a;
}
.prompt-card--terminal .prompt-card__bar {
  background: #0b1a10;
  border-bottom-color: #1a3a2a;
}
.prompt-card--terminal .prompt-card__label {
  color: #4ade80;
}

/* Prompt card — chat (purple) */
.prompt-card--chat {
  border-color: #2a1a3e;
}
.prompt-card--chat .prompt-card__bar {
  background: #120a1f;
  border-bottom-color: #2a1a3e;
}
.prompt-card--chat .prompt-card__label {
  color: #a78bfa;
}

/* Guide hint above prompt card */
.prompt-card__guide-hint {
  font-size: 0.82rem;
  color: var(--text-muted, #94a3b8);
  margin: 0 0 8px 0;
}

/* Hint line below the bar */
.prompt-card__hint {
  font-size: 0.71rem;
  padding: 5px 16px;
  margin: 0;
  border-bottom: 1px solid var(--border);
  font-family: inherit;
}
.prompt-card--terminal .prompt-card__hint {
  background: #071009;
  border-bottom-color: #1a3a2a;
  color: #86efac;
}
.prompt-card--chat .prompt-card__hint {
  background: #0d0715;
  border-bottom-color: #2a1a3e;
  color: #c4b5fd;
}

/* ─── Prompt tracks (Track A / B) ───────────────────────── */
.prompt-tracks {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.prompt-track {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.prompt-track__head {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.prompt-track__badge {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  padding: 3px 9px;
  border-radius: 4px;
  flex-shrink: 0;
}

.prompt-track__badge--a {
  background: rgba(167, 139, 250, 0.15);
  color: #a78bfa;
  border: 1px solid rgba(167, 139, 250, 0.3);
}

.prompt-track__badge--b {
  background: rgba(96, 165, 250, 0.12);
  color: #60a5fa;
  border: 1px solid rgba(96, 165, 250, 0.25);
}

.prompt-track__title {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
}

.prompt-track__rec {
  font-size: 0.68rem;
  color: #4ade80;
  background: rgba(74, 222, 128, 0.1);
  border: 1px solid rgba(74, 222, 128, 0.25);
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}

.prompt-track__desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.5;
}

.prompt-track__blanks {
  list-style: none;
  padding: 10px 14px;
  margin: 0;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.prompt-track__blanks li {
  font-size: 0.77rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.prompt-track__blanks code {
  font-family: monospace;
  font-size: 0.75rem;
  color: #a78bfa;
  background: rgba(167, 139, 250, 0.1);
  padding: 1px 5px;
  border-radius: 3px;
}

.prompt-track__example {
  font-size: 0.74rem;
  color: #7c6c9a;
  font-style: italic;
}

/* ─── Module page: navigation ────────────────────────────── */
.mod-nav {
  padding: 48px 0 64px;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
}

.mod-nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.mod-nav-back {
  font-size: 0.88rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s;
}

.mod-nav-back:hover { color: var(--text); }

@media (max-width: 700px) {
  .mod-obj-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  /* 진행률 바 */
  .mod-progress-inner {
    gap: 10px;
  }
  .mod-progress-label {
    font-size: 0.7rem;
  }

  /* 모듈 히어로 */
  .mod-hero-inner {
    padding: 0 16px;
  }
  .mod-hero .mod-title {
    font-size: 1.8rem;
  }

  /* 모듈 하단 네비게이션 */
  .mod-nav-inner {
    flex-direction: column;
    gap: 12px;
  }
  .mod-nav-inner .btn {
    width: 100%;
    text-align: center;
  }

  /* 프롬프트 카드 */
  .prompt-card__text {
    font-size: 0.78rem;
  }
}

/* ─── Fade-up scroll animation ───────────────────────────── */
.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: none;
}

/* staggered delay for grid children */
.feature-grid  .fade-up:nth-child(2) { transition-delay: 0.07s; }
.feature-grid  .fade-up:nth-child(3) { transition-delay: 0.14s; }
.feature-grid  .fade-up:nth-child(4) { transition-delay: 0.21s; }
.feature-grid  .fade-up:nth-child(5) { transition-delay: 0.28s; }
.feature-grid  .fade-up:nth-child(6) { transition-delay: 0.35s; }
.timeline      .fade-up:nth-child(2) { transition-delay: 0.1s; }
.timeline      .fade-up:nth-child(3) { transition-delay: 0.2s; }
.timeline      .fade-up:nth-child(4) { transition-delay: 0.3s; }

/* ─── Responsive ────────────────────────────────────────── */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: rgba(10, 10, 15, 0.97);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s, transform 0.2s;
  }

  .nav-menu.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-menu li {
    width: 100%;
  }

  .nav-menu a {
    display: block;
    padding: 12px 24px;
    font-size: 1rem;
  }

  .nav-menu .nav-cta {
    margin: 8px 24px;
    border-radius: 8px;
    text-align: center;
  }

  section {
    padding: 72px 0;
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    max-width: 320px;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}