/* ══════════════════════════════════════════════════
   IT Study Hub — course-page.css
   Used by: java.html, python.html, web.html,
            c.html, c__.html, csharp.html
   Requires: global.css loaded first.
══════════════════════════════════════════════════ */

/* ── INDEX PAGE WRAPPER ── */
#indexPage {
  position: relative;
  z-index: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: 60px 48px 80px;
}

/* ── COURSE HERO ── */
.course-eyebrow {
  font-family: var(--ff-mono);
  font-size: 10px;
  letter-spacing: 3px;
  color: var(--lime);
  text-transform: uppercase;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.course-eyebrow::before {
  content: '';
  width: 16px;
  height: 1px;
  background: var(--lime);
}

.course-title {
  font-family: var(--ff-display);
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -1px;
  margin-bottom: 16px;
}

.course-title em {
  font-style: normal;
  color: var(--lime);
}

.course-desc {
  font-size: 16px;
  color: var(--muted2);
  line-height: 1.7;
  max-width: 580px;
  margin-bottom: 28px;
  font-weight: 300;
}

.course-chips {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.chip {
  font-family: var(--ff-mono);
  font-size: 10px;
  padding: 5px 12px;
  border-radius: 3px;
  letter-spacing: 1px;
}

.chip-lime {
  background: var(--lime-dim);
  color: var(--lime);
  border: 1px solid rgba(200,241,53,0.2);
}

.chip-gold {
  background: var(--gold-dim);
  color: var(--gold);
  border: 1px solid rgba(247,183,49,0.2);
}

/* ── PROGRESS CARD ── */
.progress-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px 24px;
  margin-bottom: 36px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.prog-bar-wrap { flex: 1; }

.prog-bar-track {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 8px;
}

.prog-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--lime), #a8e63d);
  border-radius: 2px;
  transition: width 0.6s ease;
}

.prog-label {
  font-family: var(--ff-mono);
  font-size: 11px;
  color: var(--muted2);
}

.prog-pct {
  font-family: var(--ff-display);
  font-size: 32px;
  color: var(--lime);
}

/* ── SECTION LABEL (course variant — arrow right) ── */
.sec-label {
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.sec-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ── MODULE GRID ── */
.modules-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 40px;
}

.mod-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 26px 22px;
  cursor: pointer;
  transition: all 0.25s;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.mod-card::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--lime);
  transform: scaleX(0);
  transition: transform 0.3s ease;
  transform-origin: left;
}

.mod-card:hover:not(.locked) {
  border-color: var(--border-active);
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.5);
}

.mod-card:hover:not(.locked)::after { transform: scaleX(1); }

.mod-card.locked {
  opacity: 0.4;
  cursor: pointer;
}

.mod-card.premium-card::after { background: var(--gold); }

.mod-card.premium-card:hover {
  border-color: rgba(247,183,49,0.4);
}

.mod-card.done-card::after {
  background: var(--green);
  transform: scaleX(1);
}

.mod-card.done-card { border-color: rgba(67,233,123,0.15); }

.mod-card:hover:not(.locked)::after  { transform: scaleX(1); }
.mod-card:hover:not(.locked) .mod-arrow {
  color: var(--lime);
  transform: translateX(4px);
}

.mod-card.premium-card:hover .mod-arrow { color: var(--gold); }

.mod-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mod-icon   { font-size: 22px; }

.mod-badge {
  font-family: var(--ff-mono);
  font-size: 9px;
  letter-spacing: 1px;
  padding: 3px 8px;
  border-radius: 2px;
  text-transform: uppercase;
}

.badge-free {
  background: var(--lime-dim);
  color: var(--lime);
  border: 1px solid rgba(200,241,53,0.2);
}

.badge-premium {
  background: var(--gold-dim);
  color: var(--gold);
  border: 1px solid rgba(247,183,49,0.2);
}

.badge-done {
  background: rgba(67,233,123,0.1);
  color: var(--green);
  border: 1px solid rgba(67,233,123,0.2);
}

.mod-num {
  font-family: var(--ff-mono);
  font-size: 10px;
  color: var(--muted);
}

.mod-title {
  font-family: var(--ff-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.2;
}

.mod-desc {
  font-size: 12px;
  color: var(--muted2);
  line-height: 1.6;
  font-weight: 300;
}

.mod-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 2px;
}

.mod-level {
  font-family: var(--ff-mono);
  font-size: 10px;
  color: var(--muted);
}

.mod-arrow {
  font-size: 14px;
  color: var(--muted);
  transition: all 0.2s;
}

/* ── STUDY MATERIALS ── */
.mat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.mat-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: var(--text);
  transition: all 0.2s;
  cursor: pointer;
}

.mat-item:hover:not(.premium-mat) {
  border-color: var(--border-active);
  transform: translateX(4px);
}

.mat-item.premium-mat { opacity: 0.5; }

.mat-icon {
  font-size: 22px;
  min-width: 32px;
  text-align: center;
}

.mat-info    { flex: 1; }
.mat-title   { font-size: 13px; font-weight: 500; margin-bottom: 2px; }

.mat-desc {
  font-family: var(--ff-mono);
  font-size: 10px;
  color: var(--muted2);
}

.mat-action {
  font-family: var(--ff-mono);
  font-size: 11px;
  color: var(--lime);
}

.mat-action.locked { color: var(--gold); }

/* ── LESSON PAGE ── */
#lessonPage {
  display: none;
  position: relative;
  z-index: 1;
}

.lesson-topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 10px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 64px;
  z-index: 99;
  gap: 16px;
}

.les-breadcrumb {
  font-family: var(--ff-mono);
  font-size: 11px;
  color: var(--muted2);
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.les-breadcrumb span { color: var(--lime); }

.les-nav-btns {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.lnav-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 7px 12px;
  font-family: var(--ff-mono);
  font-size: 10px;
  color: var(--muted2);
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 1px;
  white-space: nowrap;
}

.lnav-btn:hover { border-color: var(--lime); color: var(--lime); }

.lnav-btn.done-btn {
  background: rgba(67,233,123,0.1);
  border-color: rgba(67,233,123,0.3);
  color: var(--green);
}

.lesson-layout {
  display: grid;
  grid-template-columns: 1fr 250px;
  gap: 0;
  max-width: 1100px;
  margin: 0 auto;
  padding: 56px 48px 80px;
  align-items: start;
}

.lesson-article { max-width: 680px; }

/* ── LESSON CONTENT STYLES ── */
.les-cat {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--ff-mono);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--lime);
  background: var(--lime-dim);
  border: 1px solid var(--border-active);
  padding: 5px 14px;
  border-radius: 99px;
  margin-bottom: 20px;
}

.les-cat.prem {
  color: var(--gold);
  background: var(--gold-dim);
  border-color: rgba(247,183,49,0.35);
}

.les-title {
  font-family: var(--ff-display);
  font-size: clamp(30px, 5vw, 50px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.01em;
  margin-bottom: 14px;
}

.les-excerpt {
  font-size: 15px;
  color: var(--muted2);
  line-height: 1.8;
  font-weight: 300;
  margin-bottom: 26px;
  border-left: 2px solid var(--lime);
  padding-left: 18px;
}

.les-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  padding: 14px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-bottom: 36px;
}

.meta-item {
  font-family: var(--ff-mono);
  font-size: 11px;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 5px;
}

.les-visual {
  width: 100%;
  height: 200px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 72px;
  border: 1px solid var(--border);
  margin-bottom: 36px;
  position: relative;
  overflow: hidden;
}

.les-visual-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(200,241,53,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(200,241,53,0.04) 1px, transparent 1px);
  background-size: 40px 40px;
}

/* ── ARTICLE BODY ── */
.art-body {
  font-size: 15px;
  line-height: 1.9;
  color: #d4d4e0;
  font-weight: 300;
}

.art-body p          { margin-bottom: 20px; }

.art-body h2 {
  font-family: var(--ff-display);
  font-size: 24px;
  font-weight: 800;
  color: var(--text);
  margin: 40px 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.art-body h3 {
  font-family: var(--ff-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin: 26px 0 10px;
}

.art-body strong { color: var(--text); font-weight: 600; }
.art-body em     { color: var(--lime); font-style: normal; font-weight: 500; }

.art-body code {
  font-family: var(--ff-mono);
  font-size: 12px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 6px;
  color: var(--lime);
}

.art-body pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--lime);
  border-radius: 0 12px 12px 0;
  padding: 22px;
  margin: 22px 0;
  overflow-x: auto;
  position: relative;
}

.art-body pre::before {
  content: 'CODE';
  position: absolute;
  top: 10px; right: 14px;
  font-family: var(--ff-mono);
  font-size: 9px;
  letter-spacing: 2px;
  color: var(--muted);
}

.art-body pre code {
  background: none;
  border: none;
  padding: 0;
  color: #a8d8a8;
  font-size: 12px;
  line-height: 1.7;
}

.art-body ul,
.art-body ol  { padding-left: 22px; margin-bottom: 20px; }
.art-body li  { margin-bottom: 7px; }

.art-body blockquote {
  border-left: 3px solid var(--lime);
  padding: 14px 20px;
  background: var(--lime-dim);
  border-radius: 0 10px 10px 0;
  margin: 20px 0;
  color: var(--text);
}

/* ── CONCEPTS BOX ── */
.concepts-box {
  background: var(--surface);
  border: 1px solid var(--border-active);
  border-radius: 14px;
  padding: 22px;
  margin: 28px 0;
}

.concepts-title {
  font-family: var(--ff-mono);
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--lime);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.concepts-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.concept-tag {
  background: var(--lime-dim);
  border: 1px solid rgba(200,241,53,0.2);
  color: var(--lime);
  font-family: var(--ff-mono);
  font-size: 11px;
  padding: 4px 12px;
  border-radius: 3px;
}

/* ── PREMIUM LOCK ── */
.premium-lock {
  background: var(--surface);
  border: 1px solid rgba(247,183,49,0.25);
  border-radius: 16px;
  padding: 56px 36px;
  text-align: center;
  margin-top: 40px;
}

.lock-btn {
  background: var(--gold);
  color: #000;
  border: none;
  border-radius: 8px;
  padding: 12px 28px;
  font-family: var(--ff-mono);
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 1px;
  transition: all 0.2s;
}

.lock-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(247,183,49,0.3);
}

/* ── LESSON FOOTER ── */
.les-footer {
  margin-top: 52px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.les-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.les-tag {
  font-family: var(--ff-mono);
  font-size: 10px;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 99px;
  border: 1px solid var(--border);
  color: var(--muted2);
}

.nav-lessons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.nlc {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  cursor: pointer;
  transition: all 0.2s;
}

.nlc:hover { border-color: var(--border-active); }

.nlc-dir {
  font-family: var(--ff-mono);
  font-size: 10px;
  color: var(--muted);
  margin-bottom: 5px;
}

.nlc-title { font-size: 13px; font-weight: 600; }

/* ── LESSON SIDEBAR ── */
.lesson-sidebar {
  position: sticky;
  top: 130px;
  padding-left: 24px;
  max-height: calc(100vh - 160px);
  overflow-y: auto;
}

.lesson-sidebar::-webkit-scrollbar { width: 4px; }
.lesson-sidebar::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}

.sb-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 14px;
}

.sb-label {
  font-family: var(--ff-mono);
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 14px;
}

.sb-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 7px;
  cursor: pointer;
  transition: all 0.15s;
  border: none;
  background: transparent;
  width: 100%;
  text-align: left;
  color: var(--muted2);
}

.sb-btn:hover  { background: var(--surface2); color: var(--text); }
.sb-btn.active { background: var(--lime-dim); color: var(--lime); }

.sb-num {
  width: 20px;
  height: 20px;
  border-radius: 4px;
  background: var(--surface2);
  font-family: var(--ff-mono);
  font-size: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.sb-btn.active .sb-num { background: var(--lime); color: #000; }

.sb-btn-title {
  font-size: 11px;
  font-weight: 500;
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .lesson-topbar { padding: 0 20px; }
  #indexPage     { padding: 40px 20px 60px; }
  .modules-grid  { grid-template-columns: 1fr 1fr; }
  .lesson-layout { grid-template-columns: 1fr; padding: 28px 20px 60px; }
  .lesson-sidebar { display: none; }
  .mat-grid      { grid-template-columns: 1fr; }
}

@media (max-width: 540px) {
  .modules-grid  { grid-template-columns: 1fr; }
  .nav-lessons   { grid-template-columns: 1fr; }
}