/* ============================================================
   PathtoAI Academy — AI Courses
   Cosmic dark theme · Bricolage Grotesque + DM Sans
   Matches main landing design system
   ============================================================ */

:root {
  --bg:     #06090f;
  --bg-1:   #0a101c;
  --bg-2:   #0f1729;
  --card:   rgba(14, 22, 40, 0.7);
  --line:   rgba(100, 160, 255, 0.16);
  --text:   #e4edff;
  --text-2: #94a8cc;
  --a1:     #f59e0b;
  --a2:     #ffd166;
  --a3:     #6e8efb;
  --a4:     #ff6b6b;
  --a5:     #a78bfa;
  --grad:   linear-gradient(135deg, #f59e0b, #ef4444, #8b5cf6);
  --display: "Bricolage Grotesque", sans-serif;
  --body:    "DM Sans", sans-serif;
  --ease:    cubic-bezier(.22, 1, .36, 1);

  /* Track colours */
  --trk-roadmap: #6366f1;
  --trk-engg:    #0ea5e9;
  --trk-pm:      #f59e0b;
}

/* ─── Light Theme ─── */
[data-theme="light"] {
  --bg:     #f5f7fb;
  --bg-1:   #edf0f7;
  --bg-2:   #e4e8f2;
  --card:   rgba(255, 255, 255, 0.82);
  --line:   rgba(60, 80, 130, 0.14);
  --text:   #1a1e2e;
  --text-2: #555e75;
  --a1:     #d4930a;
  --a3:     #4a6cf7;
  --a5:     #7c5ccf;
  --grad:   linear-gradient(135deg, #d4930a, #e04545, #7c5ccf);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--body);
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background 0.5s, color 0.5s;
}

/* ─── Utility ─── */
.wrap {
  width: min(1180px, calc(100% - 2.5rem));
  margin-inline: auto;
}

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

.section-label {
  font-family: var(--display);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--a1);
  margin-bottom: 1rem;
}

.section-sep { position: relative; }
.section-sep::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line), transparent);
}

.skip-link {
  position: absolute; left: 1rem; top: -48px;
  z-index: 300; background: #fff; color: #111827;
  padding: 0.55rem 0.8rem; border-radius: 8px;
  font-weight: 700; text-decoration: none;
}
.skip-link:focus { top: 1rem; }

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

/* ─── Scroll Reveal ─── */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.in { opacity: 1; transform: translateY(0); }
.reveal:nth-child(2) { transition-delay: 0.08s; }
.reveal:nth-child(3) { transition-delay: 0.16s; }
.reveal:nth-child(4) { transition-delay: 0.24s; }

/* ─── Ambient Background ─── */
.bg-glow {
  position: fixed; border-radius: 50%; filter: blur(100px);
  z-index: -2; pointer-events: none;
  animation: drift 14s ease-in-out infinite alternate;
  transition: opacity 0.5s;
}
.bg-glow--1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(99,102,241,0.18), transparent 70%);
  top: -180px; left: -120px;
}
.bg-glow--2 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(14,165,233,0.14), transparent 70%);
  top: 35%; right: -160px;
  animation-delay: -5s;
}
.bg-glow--3 {
  width: 550px; height: 550px;
  background: radial-gradient(circle, rgba(245,158,11,0.14), transparent 70%);
  bottom: -100px; left: 30%;
  animation-delay: -9s;
}
[data-theme="light"] .bg-glow { opacity: 0.35; }
[data-theme="light"] #starfield { opacity: 0; }

@keyframes drift {
  0%   { transform: translate(0, 0) scale(1); }
  100% { transform: translate(30px, -20px) scale(1.08); }
}

#starfield {
  position: fixed; inset: 0;
  z-index: -1; pointer-events: none;
}

/* ─── Navigation ─── */
.nav {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background 0.4s, box-shadow 0.4s;
  background: transparent;
}
.nav--scrolled {
  background: rgba(6, 9, 15, 0.85);
  backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--line);
}
[data-theme="light"] .nav--scrolled {
  background: rgba(245, 247, 251, 0.88);
}
.nav__inner {
  display: flex; align-items: center;
  justify-content: space-between;
  min-height: 76px; gap: 1rem;
}
.nav__brand {
  display: flex; align-items: center; gap: 0.5rem;
  font-family: var(--display); font-weight: 800;
  font-size: 1.15rem; color: var(--text);
  text-decoration: none; letter-spacing: -0.01em;
}
.nav__logo {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 10px;
  background: var(--grad); color: #06090f;
  font-weight: 800; font-size: 1rem; flex-shrink: 0;
}
.nav__links { display: flex; gap: 2rem; }
.nav__links a {
  color: var(--text-2); text-decoration: none;
  font-size: 0.9rem; font-weight: 500;
  transition: color 0.25s; position: relative;
}
.nav__links a::after {
  content: ''; position: absolute;
  bottom: -4px; left: 0; width: 0; height: 2px;
  background: var(--a1); transition: width 0.3s var(--ease);
}
.nav__links a:hover { color: var(--text); }
.nav__links a:hover::after { width: 100%; }
.nav__links a.active { color: var(--a1); }
.nav__links a.active::after { width: 100%; }

/* ─── Theme Toggle ─── */
.theme-toggle {
  width: 42px; height: 42px; border-radius: 12px;
  border: 1px solid var(--line); background: var(--card);
  color: var(--text); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.15rem;
  transition: border-color 0.3s, transform 0.25s, background 0.3s;
  flex-shrink: 0;
}
.theme-toggle:hover { border-color: var(--a1); transform: scale(1.08); }
[data-theme="light"] .theme-toggle .icon-sun  { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: inline; }
:root .theme-toggle .icon-sun  { display: inline; }
:root .theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-sun  { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: inline; }

.nav__burger {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.nav__burger span {
  width: 24px; height: 2px; background: var(--text);
  border-radius: 2px; transition: 0.3s;
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.8rem 1.6rem; border-radius: 999px;
  font-size: 0.92rem; font-weight: 700;
  text-decoration: none;
  transition: transform 0.25s var(--ease), box-shadow 0.25s;
  cursor: pointer; border: none; font-family: var(--body);
}
.btn--primary {
  background: var(--grad); color: #fff;
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(245,158,11,0.3);
}
.btn--outline {
  border: 1px solid var(--line); color: var(--text);
  background: transparent;
}
.btn--outline:hover {
  border-color: var(--a1); transform: translateY(-2px);
}

/* ─── HERO ─── */
.hero {
  min-height: 100vh; display: flex;
  align-items: center; position: relative;
  padding: 7rem 0 4rem;
}
.hero__inner {
  display: flex; flex-direction: column; gap: 1.6rem;
}
.hero__tag {
  font-family: var(--display); font-size: 0.78rem;
  font-weight: 700; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--a1);
  padding: 0.4rem 0.9rem;
  border: 1px solid rgba(245,158,11,0.35);
  border-radius: 999px; width: fit-content;
}
.hero__title {
  font-family: var(--display);
  font-size: clamp(2.4rem, 5.5vw, 4.2rem);
  font-weight: 800; line-height: 1.08;
  letter-spacing: -0.02em; max-width: 22ch;
}
.hero__sub {
  font-size: 1.12rem; color: var(--text-2);
  max-width: 58ch; line-height: 1.7;
}
.hero__actions { display: flex; gap: 0.9rem; flex-wrap: wrap; }
.hero__stats {
  display: flex; gap: 2.4rem; margin-top: 1rem; flex-wrap: wrap;
}
.stat { display: flex; flex-direction: column; }
.stat__num {
  font-family: var(--display); font-size: 2.2rem; font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat span { font-size: 0.82rem; color: var(--text-2); margin-top: 0.15rem; }
.hero__scroll {
  position: absolute; bottom: 2.5rem; left: 50%;
  transform: translateX(-50%);
}
.hero__scroll span {
  display: block; width: 22px; height: 36px;
  border: 2px solid var(--line); border-radius: 999px;
  position: relative;
}
.hero__scroll span::after {
  content: ''; width: 3px; height: 8px;
  background: var(--a1); border-radius: 999px;
  position: absolute; top: 6px; left: 50%;
  transform: translateX(-50%);
  animation: scrollDot 1.8s ease-in-out infinite;
}
@keyframes scrollDot {
  0%, 100% { opacity: 1; transform: translateX(-50%) translateY(0); }
  60%      { opacity: 0; transform: translateX(-50%) translateY(14px); }
}

/* ─── COURSE CARDS ─── */
.courses { padding: 6rem 0; }
.courses__heading {
  font-family: var(--display);
  font-size: clamp(1.6rem, 3.5vw, 2.6rem);
  font-weight: 800; margin-bottom: 1rem;
}
.courses__sub {
  color: var(--text-2); font-size: 0.95rem;
  max-width: 60ch; line-height: 1.65; margin-bottom: 2.5rem;
}

.courses__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.6rem;
}

.course-card {
  position: relative; display: flex; flex-direction: column;
  gap: 0.9rem; padding: 1.8rem 1.6rem; border-radius: 20px;
  background: var(--card); border: 1px solid var(--line);
  border-left: 3px solid var(--pc, var(--a1));
  overflow: hidden; text-decoration: none; color: inherit;
  transition: border-color 0.4s, transform 0.4s var(--ease), box-shadow 0.4s;
}
.course-card:hover {
  border-color: rgba(245,158,11,0.5);
  transform: translateY(-5px);
  box-shadow: 0 18px 50px rgba(0,0,0,0.3);
}
[data-theme="light"] .course-card:hover {
  box-shadow: 0 18px 50px rgba(0,0,0,0.08);
}

.course-card__glow {
  position: absolute; width: 180px; height: 180px;
  border-radius: 50%; filter: blur(70px);
  opacity: 0.18; pointer-events: none;
  top: -70px; right: -50px;
  transition: opacity 0.4s;
  background: var(--pc, var(--a1));
}
.course-card:hover .course-card__glow { opacity: 0.4; }

.course-card__header {
  display: flex; align-items: center; gap: 0.7rem;
  flex-wrap: wrap;
}
.course-card__icon {
  font-size: 1.6rem; line-height: 1; flex-shrink: 0;
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 12px;
  background: color-mix(in srgb, var(--pc, var(--a1)) 14%, transparent);
}
.course-card__title {
  font-family: var(--display); font-size: 1.1rem;
  font-weight: 700; margin: 0; flex: 1;
}

.level-badge {
  font-size: 0.65rem; font-weight: 700;
  letter-spacing: 0.06em; text-transform: uppercase;
  padding: 0.2rem 0.55rem; border-radius: 999px;
  white-space: nowrap;
}
.level-badge--beginner {
  background: rgba(16,185,129,0.15); color: #10b981;
  border: 1px solid rgba(16,185,129,0.3);
}
.level-badge--intermediate {
  background: rgba(59,130,246,0.15); color: #3b82f6;
  border: 1px solid rgba(59,130,246,0.3);
}
.level-badge--advanced {
  background: rgba(245,158,11,0.15); color: #f59e0b;
  border: 1px solid rgba(245,158,11,0.3);
}
.level-badge--all {
  background: rgba(139,92,246,0.15); color: #a78bfa;
  border: 1px solid rgba(139,92,246,0.3);
}

.course-card__desc {
  font-size: 0.88rem; color: var(--text-2); line-height: 1.6;
}

.course-card__tags {
  display: flex; flex-wrap: wrap; gap: 0.4rem; list-style: none;
}
.course-chip {
  font-size: 0.7rem; font-weight: 600;
  padding: 0.22rem 0.55rem; border-radius: 999px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--pc, var(--a1)) 6%, transparent);
  color: var(--text-2); letter-spacing: 0.02em;
}

.course-card__meta {
  display: flex; align-items: center;
  justify-content: space-between;
  font-size: 0.8rem; color: var(--text-2);
  gap: 0.5rem; flex-wrap: wrap;
  margin-top: auto; padding-top: 0.3rem;
}
.course-card__cta {
  font-size: 0.85rem; font-weight: 700;
  color: var(--a1); display: flex; align-items: center; gap: 6px;
  transition: gap 0.2s;
}
.course-card:hover .course-card__cta { gap: 10px; }

.course-card__status {
  font-size: 0.68rem; font-weight: 700;
  letter-spacing: 0.05em; text-transform: uppercase;
  padding: 0.18rem 0.5rem; border-radius: 999px;
}
.status--live {
  background: rgba(16,185,129,0.15); color: #10b981;
  border: 1px solid rgba(16,185,129,0.3);
}
.status--coming {
  background: rgba(245,158,11,0.15); color: #f59e0b;
  border: 1px solid rgba(245,158,11,0.3);
}

/* ─── TRACKS / AUDIENCE ─── */
.tracks { padding: 6rem 0; }
.tracks__heading {
  font-family: var(--display);
  font-size: clamp(1.6rem, 3.5vw, 2.6rem);
  font-weight: 800; margin-bottom: 3rem;
}
.tracks__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.4rem;
}
.track-card {
  padding: 1.4rem 1.3rem; border-radius: 16px;
  background: var(--card); border: 1px solid var(--line);
  transition: border-color 0.3s, transform 0.3s var(--ease);
}
.track-card:hover {
  border-color: var(--a1); transform: translateY(-3px);
}
.track-card__header {
  display: flex; align-items: center; gap: 0.6rem;
  margin-bottom: 0.7rem;
}
.track-card__icon { font-size: 1.3rem; line-height: 1; }
.track-card__name {
  font-family: var(--display); font-size: 0.95rem; font-weight: 700;
}
.track-card__badge {
  margin-left: auto; font-size: 0.72rem; font-weight: 600;
  padding: 0.18rem 0.5rem; border-radius: 999px;
  background: color-mix(in srgb, var(--a1) 12%, transparent);
  color: var(--a1);
}
.track-card__items {
  list-style: none; display: flex; flex-direction: column; gap: 0.3rem;
}
.track-card__items li {
  font-size: 0.82rem; color: var(--text-2);
  padding-left: 0.8rem; position: relative;
}
.track-card__items li::before {
  content: "·"; position: absolute; left: 0;
  color: var(--a1); font-weight: 800;
}

/* ─── LEARNING PATH ─── */
.pathway { padding: 6rem 0; }
.pathway__heading {
  font-family: var(--display);
  font-size: clamp(1.6rem, 3.5vw, 2.6rem);
  font-weight: 800; margin-bottom: 3rem;
}
.pathway__steps { display: flex; gap: 1rem; position: relative; }
.pathway__step {
  flex: 1; padding: 1.8rem 1.4rem; border-radius: 16px;
  background: var(--card); border: 1px solid var(--line);
  transition: border-color 0.3s, transform 0.3s var(--ease);
  position: relative;
}
.pathway__step:hover { border-color: var(--a1); transform: translateY(-4px); }
.pathway__num {
  font-family: var(--display); font-size: 2.4rem; font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; opacity: 0.35; line-height: 1; margin-bottom: 0.8rem;
}
.pathway__step h3 {
  font-family: var(--display); font-size: 1.05rem;
  font-weight: 700; margin-bottom: 0.5rem;
}
.pathway__step p {
  font-size: 0.88rem; color: var(--text-2); line-height: 1.6;
}
.pathway__connector {
  position: absolute; top: 50%; right: -0.7rem;
  transform: translateY(-50%); color: var(--text-2);
  font-size: 0.9rem; opacity: 0.4; pointer-events: none; z-index: 2;
}
.pathway__step:last-child .pathway__connector { display: none; }

/* ─── FAQ ─── */
.faq { padding: 6rem 0; }
.faq__heading {
  font-family: var(--display);
  font-size: clamp(1.6rem, 3.5vw, 2.6rem);
  font-weight: 800; margin-bottom: 3rem;
}
.faq__list {
  display: flex; flex-direction: column;
  gap: 0.8rem; max-width: 780px;
}
.faq__item {
  border-radius: 14px; background: var(--card);
  border: 1px solid var(--line); overflow: hidden;
  transition: border-color 0.3s;
}
.faq__item[open] { border-color: var(--a1); }
.faq__item summary {
  cursor: pointer; padding: 1.1rem 1.3rem;
  font-family: var(--display); font-size: 0.95rem; font-weight: 600;
  display: flex; align-items: center; justify-content: space-between;
  list-style: none; user-select: none;
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after {
  content: "+"; font-size: 1.3rem; font-weight: 300;
  color: var(--text-2); transition: transform 0.3s var(--ease);
  flex-shrink: 0; margin-left: 1rem;
}
.faq__item[open] summary::after {
  transform: rotate(45deg); color: var(--a1);
}
.faq__answer {
  padding: 0 1.3rem 1.2rem; font-size: 0.9rem;
  color: var(--text-2); line-height: 1.7;
}

/* ─── FINAL CTA ─── */
.final-cta { padding: 5rem 0; }
.final-cta__inner {
  text-align: center; padding: 3.5rem 2rem;
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(99,102,241,0.15), rgba(14,165,233,0.10), rgba(245,158,11,0.10));
  border: 1px solid rgba(99,102,241,0.18);
  position: relative; overflow: hidden;
}
.final-cta__inner::before {
  content: ''; position: absolute;
  width: 300px; height: 300px; border-radius: 50%;
  background: radial-gradient(circle, rgba(99,102,241,0.2), transparent 70%);
  filter: blur(60px); top: -120px; right: -80px; pointer-events: none;
}
.final-cta h2 {
  font-family: var(--display);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 800; margin-bottom: 0.6rem; position: relative;
}
.final-cta p {
  color: var(--text-2); font-size: 1rem;
  margin-bottom: 1.5rem; position: relative;
}

/* ─── FOOTER ─── */
.footer { border-top: 1px solid var(--line); padding: 2rem 0; }
.footer__inner {
  display: flex; justify-content: space-between;
  align-items: center; color: var(--text-2);
  font-size: 0.82rem; flex-wrap: wrap; gap: 0.5rem;
}
.footer__inner a {
  color: var(--a1); text-decoration: none; font-weight: 600;
}
.footer__inner a:hover { text-decoration: underline; }

/* ─── RESPONSIVE ─── */
@media (max-width: 900px) {
  .nav__links { display: none; }
  .nav__links.open {
    display: flex; flex-direction: column;
    position: absolute; top: 100%; left: 0; right: 0;
    background: rgba(6, 9, 15, 0.97);
    backdrop-filter: blur(16px); padding: 1.5rem;
    gap: 1.2rem; border-bottom: 1px solid var(--line);
  }
  [data-theme="light"] .nav__links.open { background: rgba(245,247,251,0.97); }
  .nav__burger { display: flex; }
  .theme-toggle { width: 38px; height: 38px; font-size: 1rem; }

  .courses__grid { grid-template-columns: 1fr; }
  .pathway__steps { flex-direction: column; }
  .pathway__connector { display: none; }
  .tracks__grid { grid-template-columns: repeat(2, 1fr); }
  .hero__stats { gap: 1.5rem; }
  .footer__inner { flex-direction: column; gap: 0.4rem; text-align: center; }
}

@media (max-width: 600px) {
  .hero { min-height: auto; padding: 8rem 0 3rem; }
  .hero__title { font-size: 2rem; }
  .hero__scroll { display: none; }
  .stat__num { font-size: 1.6rem; }
  .tracks__grid { grid-template-columns: 1fr; }
  .pathway__step { padding: 1.3rem 1rem; }
}