/* =========================================================
   Danusa Colares — Personal Website
   Modern tech aesthetic · Dark mode · Bilingual PT/EN
   ========================================================= */

/* ---------- 1. RESET & DESIGN TOKENS ---------- */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* Background layers */
  --bg-0: #08080c;
  --bg-1: #0d0d14;
  --bg-2: #12121c;
  --bg-3: #1a1a26;

  /* Surfaces */
  --surface-1: #15151f;
  --surface-2: #1c1c2a;
  --surface-elev: rgba(255, 255, 255, 0.03);

  /* Borders */
  --border-1: rgba(255, 255, 255, 0.06);
  --border-2: rgba(255, 255, 255, 0.10);
  --border-glow: rgba(139, 92, 246, 0.35);

  /* Text */
  --text-0: #f4f4f6;
  --text-1: #d4d4dc;
  --text-2: #9999a8;
  --text-3: #6a6a78;

  /* Brand gradient — violet → magenta → cyan */
  --accent-violet: #8b5cf6;
  --accent-magenta: #ec4899;
  --accent-cyan: #06b6d4;
  --accent-indigo: #6366f1;

  --gradient-primary: linear-gradient(135deg, #8b5cf6 0%, #ec4899 60%, #f59e0b 100%);
  --gradient-secondary: linear-gradient(135deg, #6366f1 0%, #06b6d4 100%);
  --gradient-text: linear-gradient(135deg, #c4b5fd 0%, #f9a8d4 50%, #fcd34d 100%);
  --gradient-subtle: linear-gradient(180deg, rgba(139, 92, 246, 0.08), transparent 70%);

  /* Type */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, monospace;

  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;
  --space-10: 8rem;

  /* Radii */
  --radius-sm: 0.5rem;
  --radius-md: 0.875rem;
  --radius-lg: 1.25rem;
  --radius-xl: 1.75rem;
  --radius-full: 999px;

  /* Shadows */
  --shadow-glow: 0 0 60px rgba(139, 92, 246, 0.18);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --transition: 0.35s var(--ease-out);
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-1);
  background: var(--bg-0);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100vh;
  position: relative;
}

/* Subtle ambient gradient background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 20% 0%, rgba(139, 92, 246, 0.10), transparent 50%),
    radial-gradient(ellipse 60% 50% at 80% 100%, rgba(236, 72, 153, 0.08), transparent 50%),
    radial-gradient(ellipse 40% 30% at 50% 50%, rgba(6, 182, 212, 0.04), transparent 50%);
  pointer-events: none;
  z-index: 0;
}

main {
  position: relative;
  z-index: 1;
}

/* ---------- 2. BILINGUAL TOGGLE ---------- */

body[data-lang="pt"] [data-lang="en"] { display: none !important; }
body[data-lang="en"] [data-lang="pt"] { display: none !important; }

/* ---------- 3. TYPOGRAPHY BASE ---------- */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text-0);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition);
}

p {
  font-weight: 400;
}

strong {
  color: var(--text-0);
  font-weight: 600;
}

em {
  font-style: italic;
  color: var(--text-0);
}

/* ---------- 4. LAYOUT PRIMITIVES ---------- */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.container--narrow {
  max-width: 760px;
}

.section {
  position: relative;
  padding: var(--space-10) 0;
}

@media (max-width: 768px) {
  .section { padding: var(--space-9) 0; }
}

.section__head {
  margin-bottom: var(--space-8);
}

.section__head--center {
  text-align: center;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.section__eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-2);
  padding: var(--space-2) var(--space-4);
  background: var(--surface-elev);
  border: 1px solid var(--border-1);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-5);
}

.section__eyebrow--accent {
  color: #c4b5fd;
  border-color: rgba(139, 92, 246, 0.25);
  background: rgba(139, 92, 246, 0.08);
}

.section__title {
  font-size: clamp(1.875rem, 4vw + 0.5rem, 3rem);
  margin-bottom: var(--space-4);
  max-width: 28ch;
}

.section__head--center .section__title { margin-left: auto; margin-right: auto; }

.section__sub {
  font-size: 1.125rem;
  color: var(--text-2);
  max-width: 60ch;
}

.section__head--center .section__sub { margin-left: auto; margin-right: auto; }

/* ---------- 5. NAV ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(16px) saturate(1.6);
  -webkit-backdrop-filter: blur(16px) saturate(1.6);
  background: rgba(8, 8, 12, 0.7);
  border-bottom: 1px solid var(--border-1);
}

.nav__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 600;
  color: var(--text-0);
}

.nav__brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-sm);
  background: var(--gradient-primary);
  color: white;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.nav__brand-logo {
  width: 2rem;
  height: 2rem;
  display: block;
  filter: drop-shadow(0 0 12px rgba(139, 92, 246, 0.25));
  transition: filter var(--transition), transform var(--transition);
}

.nav__brand:hover .nav__brand-logo {
  filter: drop-shadow(0 0 20px rgba(236, 72, 153, 0.45));
  transform: rotate(-4deg);
}

.nav__brand-name {
  font-size: 0.9375rem;
}

.nav__links {
  list-style: none;
  display: flex;
  gap: var(--space-5);
}

.nav__links a {
  font-size: 0.875rem;
  color: var(--text-2);
  font-weight: 500;
  transition: color var(--transition);
  position: relative;
}

.nav__links a:hover {
  color: var(--text-0);
}

.nav__links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -6px;
  width: 0; height: 2px;
  background: var(--gradient-primary);
  border-radius: 2px;
  transition: width var(--transition);
}

.nav__links a:hover::after { width: 100%; }

.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--surface-elev);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-2);
  cursor: pointer;
  transition: all var(--transition);
}

.lang-toggle:hover {
  border-color: var(--border-glow);
  color: var(--text-0);
  box-shadow: var(--shadow-glow);
}

.lang-toggle__sep { color: var(--text-3); }

body[data-lang="pt"] .lang-toggle__pt { color: var(--text-0); }
body[data-lang="pt"] .lang-toggle__en { color: var(--text-3); }
body[data-lang="en"] .lang-toggle__en { color: var(--text-0); }
body[data-lang="en"] .lang-toggle__pt { color: var(--text-3); }

@media (max-width: 880px) {
  .nav__links { display: none; }
  .nav__inner { gap: var(--space-3); }
}

/* ---------- 6. HERO ---------- */

.hero {
  position: relative;
  padding: clamp(6rem, 14vh, 11rem) 0 clamp(5rem, 12vh, 9rem);
  overflow: hidden;
}

.hero__bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 56px 56px;
  background-position: center;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 50%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 50%, transparent 100%);
  pointer-events: none;
}

.hero__bg-glow {
  position: absolute;
  top: -10%;
  left: 50%;
  transform: translateX(-50%);
  width: 60vw;
  height: 60vw;
  max-width: 700px;
  max-height: 700px;
  background: radial-gradient(circle at center, rgba(139, 92, 246, 0.18), transparent 60%);
  filter: blur(40px);
  pointer-events: none;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-2);
  padding: var(--space-2) var(--space-4);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-1);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
  letter-spacing: 0.02em;
}

.hero__dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 12px rgba(16, 185, 129, 0.6);
  animation: pulse 2.6s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hero__title {
  font-size: clamp(2.5rem, 7vw + 0.5rem, 5.5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-5);
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero__tagline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--text-1);
  margin-bottom: var(--space-6);
}

.hero__tag-pill {
  display: inline-block;
  padding: var(--space-2) var(--space-4);
  background: var(--surface-elev);
  border: 1px solid var(--border-1);
  border-radius: var(--radius-full);
  font-size: 0.9375rem;
  color: var(--text-0);
  font-weight: 500;
}

.hero__tag-sep {
  color: var(--text-3);
  font-weight: 300;
}

.hero__intro {
  font-size: clamp(1.0625rem, 1.5vw + 0.4rem, 1.25rem);
  line-height: 1.65;
  color: var(--text-1);
  max-width: 64ch;
  margin-bottom: var(--space-7);
}

.hero__intro strong {
  background: linear-gradient(135deg, #c4b5fd, #f9a8d4);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 600;
}

.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.hero__meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: var(--space-5);
  padding-top: var(--space-7);
  border-top: 1px solid var(--border-1);
  max-width: 720px;
}

.hero__meta-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.hero__meta-num {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 600;
  color: var(--text-0);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
}

.hero__meta-label {
  font-size: 0.875rem;
  color: var(--text-2);
  line-height: 1.4;
}

/* ---------- 7. BUTTONS ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-full);
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  cursor: pointer;
  transition: all var(--transition);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn--primary {
  background: var(--gradient-primary);
  color: white;
  font-weight: 600;
  box-shadow: 0 4px 24px rgba(139, 92, 246, 0.25);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 40px rgba(139, 92, 246, 0.4);
}

.btn--ghost {
  background: var(--surface-elev);
  color: var(--text-0);
  border-color: var(--border-2);
}

.btn--ghost:hover {
  border-color: var(--border-glow);
  background: rgba(139, 92, 246, 0.08);
}

.btn__arrow {
  display: inline-block;
  transition: transform var(--transition);
}

.btn:hover .btn__arrow {
  transform: translateX(4px);
}

/* ---------- 8. PROSE ---------- */

.prose {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--text-1);
}

.prose > p + p {
  margin-top: var(--space-5);
}

.prose__highlight {
  position: relative;
  padding: var(--space-5) var(--space-6);
  margin: var(--space-6) 0 !important;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.08), rgba(236, 72, 153, 0.04));
  border-left: 3px solid var(--accent-violet);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--text-0);
  font-size: 1.125rem;
  font-weight: 500;
  font-style: italic;
}

/* ---------- 9. NOW SECTION (Current role grid) ---------- */

.now-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-5);
}

.now-card {
  position: relative;
  padding: var(--space-6);
  background: var(--surface-1);
  border: 1px solid var(--border-1);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
  overflow: hidden;
}

.now-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent, rgba(139, 92, 246, 0.06));
  opacity: 0;
  transition: opacity var(--transition);
}

.now-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
}

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

.now-card > * { position: relative; z-index: 1; }

.now-card__num {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 600;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: var(--space-3);
  line-height: 1;
  letter-spacing: -0.02em;
}

.now-card__title {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-0);
  margin-bottom: var(--space-3);
}

.now-card__text {
  font-size: 0.9375rem;
  color: var(--text-2);
  line-height: 1.55;
}

.now-card--wide { grid-column: span 2; }

@media (max-width: 720px) {
  .now-card--wide { grid-column: span 1; }
}

.now-card--accent {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.12), rgba(236, 72, 153, 0.06));
  border-color: rgba(139, 92, 246, 0.25);
}

/* ---------- 10. TIMELINE ---------- */

.timeline {
  list-style: none;
  position: relative;
  padding-left: var(--space-7);
  max-width: 880px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0.5rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-violet), var(--accent-magenta), transparent);
  border-radius: 2px;
}

.timeline__item {
  position: relative;
  padding-bottom: var(--space-7);
}

.timeline__item:last-child { padding-bottom: 0; }

.timeline__marker {
  position: absolute;
  left: calc(var(--space-7) * -1 + 0.125rem);
  top: 0.5rem;
  width: 0.875rem;
  height: 0.875rem;
  border-radius: 50%;
  background: var(--bg-0);
  border: 2px solid var(--accent-violet);
  box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.15);
}

.timeline__item--past .timeline__marker {
  border-color: var(--text-3);
  box-shadow: 0 0 0 4px rgba(106, 106, 120, 0.12);
}

.timeline__date {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-2);
  margin-bottom: var(--space-2);
  letter-spacing: 0.02em;
}

.timeline__role {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-0);
  margin-bottom: var(--space-2);
}

.timeline__company {
  font-size: 0.9375rem;
  color: var(--text-1);
  margin-bottom: var(--space-3);
  font-weight: 500;
}

.timeline__sep {
  margin: 0 var(--space-2);
  color: var(--text-3);
}

.timeline__desc {
  font-size: 0.9375rem;
  color: var(--text-2);
  line-height: 1.6;
  max-width: 60ch;
}

@media (max-width: 600px) {
  .timeline { padding-left: var(--space-6); }
  .timeline__marker { left: calc(var(--space-6) * -1 + 0.125rem); }
}

/* ---------- 11. EDUCATION GRID ---------- */

.edu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-5);
}

.edu-card {
  position: relative;
  padding: var(--space-6);
  background: var(--surface-1);
  border: 1px solid var(--border-1);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
}

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

.edu-card--featured {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.10), rgba(6, 182, 212, 0.04));
  border-color: rgba(139, 92, 246, 0.25);
  grid-column: span 2;
}

@media (max-width: 720px) {
  .edu-card--featured { grid-column: span 1; }
}

.edu-card__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: var(--space-1) var(--space-3);
  background: rgba(16, 185, 129, 0.15);
  color: #6ee7b7;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

.edu-card__title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-0);
  margin-bottom: var(--space-2);
}

.edu-card__inst {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-2);
  margin-bottom: var(--space-3);
  letter-spacing: 0.01em;
}

.edu-card__desc {
  font-size: 0.9375rem;
  color: var(--text-2);
  line-height: 1.55;
}

.edu-card__list,
.lang-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.edu-card__list li,
.lang-list li {
  font-size: 0.9375rem;
  color: var(--text-1);
  padding-left: var(--space-5);
  position: relative;
}

.edu-card__list li::before,
.lang-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.625em;
  width: 0.375rem;
  height: 0.375rem;
  background: var(--accent-violet);
  border-radius: 50%;
}

.lang-list strong {
  color: var(--text-0);
  font-weight: 600;
}

.lang-note {
  color: var(--text-3);
  font-size: 0.875rem;
}

/* ---------- 12. MENTORING ---------- */

.section--mentoring {
  position: relative;
}

.section__bg-blob {
  position: absolute;
  top: 10%;
  right: -20%;
  width: 50%;
  height: 50%;
  background: radial-gradient(circle at center, rgba(236, 72, 153, 0.12), transparent 60%);
  filter: blur(60px);
  pointer-events: none;
  z-index: 0;
}

.section--mentoring .container { position: relative; z-index: 1; }

.mentoring-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-8);
  align-items: start;
}

@media (max-width: 880px) {
  .mentoring-grid { grid-template-columns: 1fr; gap: var(--space-7); }
}

.mentoring-grid__col {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.mentoring-card {
  padding: var(--space-6);
  background: var(--surface-1);
  border: 1px solid var(--border-1);
  border-radius: var(--radius-lg);
}

.mentoring-card--principles {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.08), rgba(236, 72, 153, 0.04));
  border-color: rgba(139, 92, 246, 0.20);
}

.mentoring-card__title {
  font-size: 1rem;
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-2);
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-1);
}

.mentoring-card__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.mentoring-card__list li {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: var(--space-4);
  font-size: 0.9375rem;
}

.mentoring-card__label {
  color: var(--text-2);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
}

.mentoring-card__value {
  color: var(--text-0);
  font-weight: 500;
}

.mentoring-card__principles {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.mentoring-card__principles li {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--text-1);
  padding-left: var(--space-5);
  position: relative;
}

.mentoring-card__principles li::before {
  content: '→';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--accent-magenta);
  font-weight: 600;
}

/* ---------- 12b. COURSES ---------- */

.section--courses {
  position: relative;
}

.section--courses::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 50% 40% at 10% 50%, rgba(245, 158, 11, 0.05), transparent 60%),
    radial-gradient(ellipse 40% 50% at 90% 30%, rgba(139, 92, 246, 0.06), transparent 60%);
  pointer-events: none;
}

.section--courses .container { position: relative; z-index: 1; }

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-5);
  margin-bottom: var(--space-8);
}

.course-card {
  position: relative;
  padding: var(--space-7) var(--space-6);
  background: var(--surface-1);
  border: 1px solid var(--border-1);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
  overflow: hidden;
}

.course-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 2px;
  background: var(--gradient-primary);
  opacity: 0.4;
  transition: opacity var(--transition);
}

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

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

.course-card__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: var(--space-4);
}

.course-card__title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-0);
  margin-bottom: var(--space-3);
  letter-spacing: -0.01em;
}

.course-card__desc {
  font-size: 0.9375rem;
  color: var(--text-2);
  line-height: 1.6;
}

/* Signup form */
.courses-signup {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-6);
  align-items: center;
  padding: var(--space-7);
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.08), rgba(236, 72, 153, 0.04));
  border: 1px solid rgba(139, 92, 246, 0.20);
  border-radius: var(--radius-xl);
}

@media (max-width: 760px) {
  .courses-signup {
    grid-template-columns: 1fr;
    gap: var(--space-5);
    padding: var(--space-6);
  }
}

.courses-signup__title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-0);
  margin-bottom: var(--space-3);
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.courses-signup__sub {
  font-size: 0.9375rem;
  color: var(--text-2);
  line-height: 1.5;
}

.courses-signup__form {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.courses-signup__input {
  flex: 1 1 200px;
  padding: var(--space-4) var(--space-5);
  background: var(--surface-1);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-full);
  color: var(--text-0);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  transition: all var(--transition);
}

.courses-signup__input:focus {
  outline: none;
  border-color: var(--accent-violet);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2);
}

.courses-signup__input::placeholder {
  color: var(--text-3);
}

.courses-signup__btn {
  flex-shrink: 0;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 13. MATERIALS ---------- */

.materials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-5);
}

.material-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: var(--space-7) var(--space-6);
  background: var(--surface-1);
  border: 1px solid var(--border-1);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
  overflow: hidden;
  cursor: pointer;
}

.material-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent, rgba(139, 92, 246, 0.08));
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

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

.material-card:hover::after { opacity: 1; }

.material-card > * { position: relative; z-index: 1; }

.material-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(236, 72, 153, 0.08));
  color: #c4b5fd;
  margin-bottom: var(--space-5);
}

.material-card__icon svg {
  width: 1.5rem;
  height: 1.5rem;
}

.material-card__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: var(--space-1) var(--space-3);
  background: var(--gradient-primary);
  color: white;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-3);
  align-self: flex-start;
}

.material-card__title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-0);
  margin-bottom: var(--space-3);
}

.material-card__desc {
  font-size: 0.9375rem;
  color: var(--text-2);
  line-height: 1.6;
  margin-bottom: var(--space-6);
  flex-grow: 1;
}

.material-card__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  color: #c4b5fd;
}

.material-card__arrow {
  transition: transform var(--transition);
}

.material-card:hover .material-card__arrow {
  transform: translateX(4px);
}

.material-card--featured {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.10), rgba(6, 182, 212, 0.04));
  border-color: rgba(139, 92, 246, 0.20);
}

/* ---------- 14. RESEARCH ---------- */

.section--research {
  border-top: 1px solid var(--border-1);
  border-bottom: 1px solid var(--border-1);
  background: var(--bg-1);
}

/* ---------- 14b. RECOMMENDATIONS ---------- */

.section--recommendations {
  position: relative;
}

.recommends-group + .recommends-group {
  margin-top: var(--space-8);
}

.recommends-group__title {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-2);
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-1);
}

.recommends-group__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  color: var(--accent-magenta);
}

.recommends-group__icon svg {
  width: 1.125rem;
  height: 1.125rem;
}

.recommends-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-5);
}

.recommend-card {
  position: relative;
  padding: var(--space-6);
  background: var(--surface-1);
  border: 1px solid var(--border-1);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
}

.recommend-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.recommend-card__type {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: var(--space-3);
}

.recommend-card__title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-0);
  margin-bottom: var(--space-2);
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.recommend-card__meta {
  font-size: 0.875rem;
  color: var(--text-2);
  margin-bottom: var(--space-4);
  font-style: italic;
}

.recommend-card__note {
  font-size: 0.9375rem;
  color: var(--text-1);
  line-height: 1.65;
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-1);
  position: relative;
}

.recommend-card__note::before {
  content: '“';
  position: absolute;
  top: -0.5rem;
  left: -0.25rem;
  font-family: Georgia, serif;
  font-size: 2.5rem;
  line-height: 1;
  color: var(--accent-violet);
  opacity: 0.4;
}

/* ---------- 15. CONTACT ---------- */

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-4);
}

.contact-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-5);
  background: var(--surface-1);
  border: 1px solid var(--border-1);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

a.contact-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-2px);
}

.contact-card__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-3);
}

.contact-card__value {
  font-size: 1rem;
  color: var(--text-0);
  font-weight: 500;
  word-break: break-word;
}

.contact-card__value small {
  display: inline-block;
  margin-top: var(--space-1);
  font-size: 0.8125rem;
  color: var(--text-2);
  font-weight: 400;
}

.contact-card--static {
  background: transparent;
}

/* ---------- 16. FOOTER ---------- */

.footer {
  padding: var(--space-7) 0;
  border-top: 1px solid var(--border-1);
  margin-top: var(--space-8);
}

.footer__text {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-3);
  text-align: center;
  letter-spacing: 0.02em;
}

/* ---------- 17. SCROLL ANIMATIONS ---------- */

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Respect users who prefer reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 18. UTILITY & PRINT ---------- */

::selection {
  background: rgba(139, 92, 246, 0.35);
  color: white;
}

@media print {
  body::before, .hero__bg-grid, .hero__bg-glow, .section__bg-blob { display: none; }
  .nav { position: static; }
  body { background: white; color: black; }
}