/* ═══════════════════════════════════════════════════════════
   engineering.css — Diego Melgara Engineering Portfolio
   Shared stylesheet for all pages under /engineering/
   ═══════════════════════════════════════════════════════════ */

/* ── Design Tokens ──────────────────────────────────────── */
:root {
  /* Core palette — matches main site */
  --bg-primary:    #09090b;
  --bg-secondary:  #0f0f13;
  --bg-card:       #141419;
  --bg-card-hover: #1a1a22;
  --bg-elevated:   #1e1e28;

  /* Engineering accent — amber (vs. indigo on main site) */
  --accent:        #f59e0b;
  --accent-light:  #fbbf24;
  --accent-glow:   rgba(245, 158, 11, 0.12);
  --accent-strong: rgba(245, 158, 11, 0.28);

  /* Secondary — teal kept from main site */
  --teal:          #2dd4bf;
  --teal-glow:     rgba(45, 212, 191, 0.12);

  /* Text */
  --text-primary:  #fafafa;
  --text-secondary:#a1a1aa;
  --text-muted:    #71717a;

  /* Borders */
  --border:        rgba(255, 255, 255, 0.06);
  --border-hover:  rgba(255, 255, 255, 0.12);
  --border-accent: rgba(245, 158, 11, 0.28);

  /* Effects */
  --radius:        12px;
  --radius-lg:     20px;
  --radius-xl:     28px;
  --transition:    0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow:        0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg:     0 12px 48px rgba(0, 0, 0, 0.5);

  /* Gradients */
  --gradient-text: linear-gradient(135deg, var(--accent-light), var(--teal));
  --gradient-card: linear-gradient(135deg, rgba(245,158,11,0.07), rgba(45,212,191,0.04));
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-secondary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

section { padding: 100px 0; position: relative; }

/* ── Cursor Glow ────────────────────────────────────────── */
.cursor-glow {
  position: fixed;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

/* ── Typography ─────────────────────────────────────────── */
.section-tag {
  display: inline-flex;
  align-items: center;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-light);
  background: var(--accent-glow);
  border: 1px solid var(--border-accent);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 20px;
}

.section-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.15;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 560px;
  margin-bottom: 48px;
}

.section-header { text-align: center; margin-bottom: 16px; }
.section-header .section-subtitle { margin: 0 auto 48px; }

.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Buttons ────────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: var(--accent);
  color: #09090b;
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  font-weight: 700;
  border-radius: 100px;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(245, 158, 11, 0.35);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: transparent;
  color: var(--accent-light);
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 100px;
  border: 1.5px solid var(--border-accent);
  cursor: pointer;
  transition: all var(--transition);
}

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

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--bg-card);
  color: var(--text-muted);
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: 100px;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all var(--transition);
}

.btn-ghost:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  color: var(--text-primary);
}

/* ── Animations ─────────────────────────────────────────── */
.animate-in {
  opacity: 0;
  transform: translateY(24px);
  animation: fadeSlideUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  animation-delay: var(--delay, 0s);
}

@keyframes fadeSlideUp {
  to { opacity: 1; transform: translateY(0); }
}

[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-reveal].revealed { opacity: 1; transform: translateY(0); }

/* ═══════════════════════════════════════════════════════════
   NAVIGATION
   ═══════════════════════════════════════════════════════════ */
#engNav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 18px 0;
  transition: all var(--transition);
}

#engNav.scrolled {
  padding: 12px 0;
  background: rgba(9, 9, 11, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-bracket { color: var(--accent-light); }

.nav-section-label {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-light);
  background: var(--accent-glow);
  border: 1px solid var(--border-accent);
  padding: 4px 12px;
  border-radius: 100px;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 7px 14px;
  border-radius: 100px;
  transition: all var(--transition);
}

.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.nav-link.active {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.08);
}

.nav-link-main {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 7px 14px;
  border-radius: 100px;
  border: 1px solid var(--border);
  transition: all var(--transition);
  margin-left: 8px;
}

.nav-link-main:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  background: rgba(255, 255, 255, 0.04);
}

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

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translateY(5px) translateX(5px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translateY(-5px) translateX(5px); }

/* ── Breadcrumb ─────────────────────────────────────────── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 12px 0;
  flex-wrap: wrap;
}

.breadcrumb a { color: var(--text-muted); transition: color var(--transition); }
.breadcrumb a:hover { color: var(--accent-light); }
.breadcrumb-sep { color: var(--border-hover); }
.breadcrumb-current { color: var(--text-secondary); }

/* ═══════════════════════════════════════════════════════════
   HERO — Engineering Landing
   ═══════════════════════════════════════════════════════════ */
.eng-hero {
  min-height: 88vh;
  display: flex;
  align-items: center;
  padding: 140px 24px 80px;
  position: relative;
  overflow: hidden;
}

.eng-hero-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.018) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 40%, black, transparent);
  -webkit-mask-image: radial-gradient(ellipse 70% 70% at 50% 40%, black, transparent);
}

.eng-hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  pointer-events: none;
  z-index: 0;
}

.eng-orb-1 {
  width: 500px; height: 500px;
  background: rgba(245, 158, 11, 0.09);
  top: 5%; left: -5%;
  animation: floatOrb 22s ease-in-out infinite;
}

.eng-orb-2 {
  width: 360px; height: 360px;
  background: rgba(45, 212, 191, 0.07);
  bottom: 5%; right: 5%;
  animation: floatOrb 28s ease-in-out infinite reverse;
}

@keyframes floatOrb {
  0%, 100% { transform: translate(0, 0); }
  33%       { transform: translate(24px, -32px); }
  66%       { transform: translate(-16px, 16px); }
}

.eng-hero-content {
  position: relative;
  z-index: 2;
  max-width: 760px;
}

.eng-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-light);
  background: var(--accent-glow);
  border: 1px solid var(--border-accent);
  padding: 7px 18px;
  border-radius: 100px;
  margin-bottom: 32px;
}

.eng-hero-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.eng-hero-title span {
  display: block;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.eng-hero-subtitle {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

.eng-hero-goal {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 540px;
  line-height: 1.85;
  margin-bottom: 40px;
}

.eng-hero-ctas {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

/* ═══════════════════════════════════════════════════════════
   ABOUT PORTFOLIO
   ═══════════════════════════════════════════════════════════ */
#about {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

.eng-about-inner { max-width: 720px; }

.eng-about-inner p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.9;
  margin-bottom: 16px;
}

/* ═══════════════════════════════════════════════════════════
   ACADEMIC ROADMAP
   ═══════════════════════════════════════════════════════════ */
#roadmap {
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
}

.roadmap-track {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: start;
  gap: 0;
  margin-top: 56px;
}

.roadmap-connector {
  display: flex;
  align-items: flex-start;
  padding-top: 34px;
}

.roadmap-connector-line {
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-light), var(--teal));
  opacity: 0.3;
  margin-top: 14px;
}

.roadmap-arrow {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 8px;
  opacity: 0.45;
  flex-shrink: 0;
  padding: 0 4px;
}

.roadmap-step {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  position: relative;
  transition: all var(--transition);
  overflow: hidden;
}

.roadmap-step:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.roadmap-step.active {
  border-color: var(--border-accent);
  background: linear-gradient(135deg, rgba(245,158,11,0.06), var(--bg-card));
}

.roadmap-step.active::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient-text);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.roadmap-step-num {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-light);
  opacity: 0.65;
  margin-bottom: 14px;
}

.roadmap-step.future .roadmap-step-num { color: var(--text-muted); }

.roadmap-step-icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  margin-bottom: 16px;
  border: 1px solid var(--border-accent);
  background: var(--accent-glow);
  color: var(--accent-light);
}

.roadmap-step.future .roadmap-step-icon {
  background: rgba(255,255,255,0.03);
  border-color: var(--border);
  color: var(--text-muted);
}

.roadmap-step h4 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.roadmap-step.future h4 { color: var(--text-secondary); }

.roadmap-step p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 16px;
}

.roadmap-orgs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}

.roadmap-org-tag {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--teal);
  background: var(--teal-glow);
  border: 1px solid rgba(45, 212, 191, 0.2);
  padding: 3px 10px;
  border-radius: 100px;
}

.roadmap-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 100px;
}

.status-current {
  color: #4ade80;
  background: rgba(74, 222, 128, 0.08);
  border: 1px solid rgba(74, 222, 128, 0.2);
}

.status-dot {
  display: block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #4ade80;
  box-shadow: 0 0 8px rgba(74, 222, 128, 0.5);
  animation: statusPulse 2s ease-in-out infinite;
}

@keyframes statusPulse {
  0%, 100% { box-shadow: 0 0 6px rgba(74, 222, 128, 0.3); }
  50%       { box-shadow: 0 0 16px rgba(74, 222, 128, 0.6); }
}

.status-target {
  color: var(--accent-light);
  background: var(--accent-glow);
  border: 1px solid var(--border-accent);
}

.status-longterm {
  color: var(--teal);
  background: var(--teal-glow);
  border: 1px solid rgba(45, 212, 191, 0.22);
}

/* ═══════════════════════════════════════════════════════════
   SEMESTERS SECTION
   ═══════════════════════════════════════════════════════════ */
#semesters {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

.semesters-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.semester-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.semester-card.active {
  border-color: var(--border-accent);
  background: linear-gradient(135deg, rgba(245,158,11,0.06), var(--bg-card));
}

.semester-card.active::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient-text);
}

.semester-card.active:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.semester-card.locked { opacity: 0.45; cursor: default; }
.semester-card.locked:hover { transform: none; }

.semester-num {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: 8px;
}

.semester-card.locked .semester-num { color: var(--text-muted); }

.semester-card h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.semester-card.locked h3 { color: var(--text-secondary); }

.semester-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.65;
  flex: 1;
}

.semester-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.semester-course-count {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.semester-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-light);
  transition: all var(--transition);
}

.semester-link:hover { gap: 10px; color: var(--teal); }

.semester-lock-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

/* ═══════════════════════════════════════════════════════════
   SEMESTER PAGE — HERO + COURSE GRID
   ═══════════════════════════════════════════════════════════ */
.semester-hero {
  padding: 140px 24px 72px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.semester-hero-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 80% 80% at 15% 50%, black, transparent);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at 15% 50%, black, transparent);
}

.semester-hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.semester-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 20px;
  margin-bottom: 28px;
}

.semester-meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.84rem;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 6px 14px;
  border-radius: 100px;
}

.semester-meta-item i { color: var(--accent-light); font-size: 0.88rem; }

.courses-section {
  padding: 80px 0;
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.course-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.course-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-card);
  opacity: 0;
  transition: opacity var(--transition);
}

.course-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.course-card:hover::before { opacity: 1; }

.course-code {
  position: relative;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-light);
  opacity: 0.75;
}

.course-card h3 {
  position: relative;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.25;
}

.course-card p {
  position: relative;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  flex: 1;
}

.course-card-footer {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  margin-top: 4px;
}

.course-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-light);
  transition: all var(--transition);
}

.course-link:hover { gap: 10px; color: var(--teal); }

.course-tag {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  padding: 3px 10px;
  border-radius: 100px;
}

/* GPA badge — uncomment in semester page HTML to enable
.gpa-block { margin-bottom: 32px; }
.gpa-badge {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  padding: 14px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius);
}
.gpa-badge-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.gpa-badge-value {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.6rem;
  font-weight: 700;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
*/

/* ═══════════════════════════════════════════════════════════
   COURSE PAGE — CASE STUDY LAYOUT
   ═══════════════════════════════════════════════════════════ */
.course-hero {
  padding: 140px 24px 64px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.course-hero-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 80% at 0% 50%, rgba(245,158,11,0.05), transparent);
  pointer-events: none;
}

.course-hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 48px;
  align-items: end;
}

.course-hero-code {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: 12px;
}

.course-hero-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.course-hero-desc {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 540px;
  line-height: 1.85;
}

/* Final grade badge — uncomment per course when ready
.grade-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 104px; height: 104px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-accent);
  flex-shrink: 0;
}
.grade-badge-label {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.grade-badge-value {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2rem;
  font-weight: 700;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
*/

.course-body {
  padding: 80px 24px;
}

.course-body-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}

.course-section-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: 16px;
}

.course-section-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 24px;
  letter-spacing: -0.01em;
}

.learned-list { display: flex; flex-direction: column; gap: 12px; }

.learned-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition);
}

.learned-item:hover {
  border-color: var(--border-accent);
  background: linear-gradient(135deg, rgba(245,158,11,0.04), var(--bg-card));
}

.learned-item-icon {
  flex-shrink: 0;
  width: 32px; height: 32px;
  border-radius: 8px;
  background: var(--accent-glow);
  border: 1px solid var(--border-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-light);
  font-size: 0.85rem;
  margin-top: 1px;
}

.learned-item p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ── Featured Work ───────────────────────────────────────── */
.featured-work {
  padding: 0 24px 80px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding-top: 72px;
}

.featured-work-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.featured-work-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 8px;
}

.work-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
}

.work-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.img-placeholder {
  width: 100%;
  aspect-ratio: 16 / 10;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.img-placeholder i {
  font-size: 1.8rem;
  color: var(--text-muted);
  opacity: 0.2;
}

.img-placeholder span {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  opacity: 0.35;
  font-weight: 500;
}

.work-card-body { padding: 20px 22px 22px; }

.work-card-body h4 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.work-card-body p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ═══════════════════════════════════════════════════════════
   FOOTER — Engineering
   ═══════════════════════════════════════════════════════════ */
.eng-footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
  padding: 40px 0 28px;
}

.eng-footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  border-bottom: 1px solid var(--border);
}

.eng-footer-brand .footer-logo {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  display: inline-block;
}

.eng-footer-tagline {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.eng-footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  align-items: center;
}

.eng-footer-links a {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.eng-footer-links a:hover { color: var(--text-primary); }

.footer-link-external {
  font-size: 0.7rem;
  opacity: 0.5;
}

.eng-footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 24px 0;
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════════════ */
@media (max-width: 1024px) {
  .roadmap-track {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .roadmap-connector {
    justify-content: center;
    padding: 0;
    height: 28px;
  }

  .roadmap-connector-line {
    width: 2px;
    height: 28px;
    background: linear-gradient(to bottom, var(--accent-light), var(--teal));
    flex: none;
    margin-top: 0;
  }

  .roadmap-arrow { display: none; }

  .semesters-grid { grid-template-columns: repeat(2, 1fr); }
  .courses-grid { grid-template-columns: 1fr; }

  .course-body-inner {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .course-hero-inner { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  section { padding: 72px 0; }

  .nav-toggle { display: flex; }

  .nav-right {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(9, 9, 11, 0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 8px;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
    z-index: 999;
  }

  .nav-right.open { opacity: 1; visibility: visible; }

  .nav-right .nav-link,
  .nav-right .nav-link-main {
    font-size: 1.15rem;
    padding: 12px 32px;
    margin: 0;
    border: none;
    background: none;
  }

  .nav-section-label { display: none; }
  .nav-toggle { z-index: 1001; }

  .semesters-grid { grid-template-columns: 1fr; }

  .eng-footer-inner { flex-direction: column; text-align: center; }
  .eng-footer-links { justify-content: center; }
}

@media (max-width: 480px) {
  .eng-hero-ctas { flex-direction: column; align-items: flex-start; }
  .semester-meta { gap: 8px; }
  .featured-work-grid { grid-template-columns: 1fr; }
  .eng-hero { padding: 120px 20px 64px; }
}