/* ===================================================
   DarkExpert.com — Stylesheet
   =================================================== */

/* --- Tokens --- */
:root {
  --bg-base: #0a0a0a;
  --bg-panel: #111111;
  --bg-card: #161616;
  --bg-card-hover: #1a1a1a;
  --bg-code: #0d0d0d;
  --bg-nav: rgba(10, 10, 10, 0.92);

  --text-primary: #e8e8e8;
  --text-secondary: #999999;
  --text-muted: #666666;
  --text-headline: #ffffff;

  --accent: #d4a853;
  --accent-dim: #b8923f;
  --accent-glow: rgba(212, 168, 83, 0.12);

  --border: #222222;
  --border-light: #2a2a2a;

  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  --max-width: 1120px;
  --section-pad: 120px;
  --section-pad-mobile: 72px;
  --nav-height: 60px;

  --radius: 8px;
  --radius-sm: 4px;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-height); }
body {
  font-family: var(--font-body);
  background: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* --- Utility --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===================================================
   NAV
   =================================================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: var(--bg-nav);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.nav__logo {
  font-weight: 700;
  font-size: 15px;
  color: var(--text-headline);
  display: flex;
  align-items: center;
  gap: 6px;
  letter-spacing: -0.02em;
}
.nav__logo-icon {
  color: var(--accent);
  font-size: 14px;
}
.nav__links {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav__link {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s;
  letter-spacing: 0.01em;
}
.nav__link:hover,
.nav__link.active {
  color: var(--text-headline);
}
.nav__link--cta {
  background: var(--accent);
  color: var(--bg-base) !important;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: background 0.2s;
}
.nav__link--cta:hover {
  background: var(--accent-dim);
}

/* Mobile nav toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav__toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: transform 0.2s, opacity 0.2s;
}
.nav__toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle.open span:nth-child(2) { opacity: 0; }
.nav__toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===================================================
   HERO
   =================================================== */
.hero {
  padding-top: calc(var(--nav-height) + 80px);
  padding-bottom: var(--section-pad);
  min-height: 100vh;
  display: flex;
  align-items: center;
}
.hero .container {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 64px;
  align-items: center;
}
.hero__label {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 20px;
}
.hero__title {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 800;
  color: var(--text-headline);
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}
.hero__sub {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 560px;
  margin-bottom: 36px;
}
.hero__ctas {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* --- Hero diagram --- */
.diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}
.diagram__node {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  padding: 10px 24px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  text-align: center;
  width: 100%;
  max-width: 260px;
}
.diagram__node--you {
  color: var(--text-secondary);
}
.diagram__node--expert {
  color: var(--accent);
  border-color: var(--accent-dim);
  background: rgba(212, 168, 83, 0.06);
}
.diagram__node--exec {
  color: var(--text-secondary);
}
.diagram__line {
  width: 1px;
  height: 20px;
  background: var(--border-light);
}
.diagram__capabilities {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  padding: 12px 0;
  max-width: 280px;
}
.diagram__capabilities span {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid rgba(212, 168, 83, 0.2);
  padding: 3px 10px;
  border-radius: 2px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* ===================================================
   BUTTONS
   =================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn--primary {
  background: var(--accent);
  color: var(--bg-base);
  border-color: var(--accent);
}
.btn--primary:hover {
  background: var(--accent-dim);
  border-color: var(--accent-dim);
}
.btn--secondary {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border-light);
}
.btn--secondary:hover {
  border-color: var(--text-muted);
  color: var(--text-headline);
}
.btn--lg {
  padding: 14px 32px;
  font-size: 15px;
}

/* ===================================================
   SECTIONS (shared)
   =================================================== */
.section {
  padding: var(--section-pad) 0;
}
.section--alt {
  background: var(--bg-panel);
}
.section__label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 12px;
}
.section__title {
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 800;
  color: var(--text-headline);
  line-height: 1.12;
  letter-spacing: -0.025em;
  margin-bottom: 20px;
}
.section__intro {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 640px;
  margin-bottom: 48px;
  line-height: 1.6;
}
.section__supporting {
  font-size: 15px;
  color: var(--text-secondary);
  max-width: 640px;
  margin-top: 48px;
  line-height: 1.65;
  border-left: 2px solid var(--accent);
  padding-left: 20px;
}

/* ===================================================
   WHY section
   =================================================== */
.why__grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 48px;
  margin-top: 40px;
}
.why__lead {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 28px;
}
.why__list {
  list-style: none;
}
.why__list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 14px;
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.55;
}
.why__list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 600;
}
.why__card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}
.why__card-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 12px;
}
.why__card-text {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===================================================
   FEATURES (3-column)
   =================================================== */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: border-color 0.2s, background 0.2s;
}
.feature-card:hover {
  border-color: var(--border-light);
  background: var(--bg-card-hover);
}
.feature-card__icon {
  font-size: 22px;
  color: var(--accent);
  margin-bottom: 16px;
  line-height: 1;
}
.feature-card__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-headline);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}
.feature-card__text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===================================================
   HOW (4-step flow)
   =================================================== */
.steps {
  display: flex;
  align-items: flex-start;
  gap: 0;
  margin-top: 48px;
}
.step {
  flex: 1;
  padding: 28px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.step__number {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid rgba(212, 168, 83, 0.2);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  margin-bottom: 16px;
}
.step__title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-headline);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}
.step__text {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}
.step__connector {
  width: 32px;
  min-width: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  align-self: center;
  position: relative;
}
.step__connector::after {
  content: '';
  width: 100%;
  height: 1px;
  background: var(--border-light);
}

/* ===================================================
   COMPARE
   =================================================== */
.compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 48px;
}
.compare__col {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
}
.compare__col--generic {
  background: var(--bg-base);
  opacity: 0.7;
}
.compare__col--dark {
  background: var(--bg-card);
  border-color: var(--accent-dim);
}
.compare__heading {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-headline);
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}
.compare__list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 12px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}
.compare__icon {
  flex-shrink: 0;
  font-size: 11px;
  line-height: 1.8;
}
.compare__icon--no { color: var(--text-muted); }
.compare__icon--yes { color: var(--accent); }
.compare__line {
  margin-top: 40px;
  font-size: 17px;
  font-weight: 600;
  color: var(--text-headline);
  letter-spacing: -0.01em;
}

/* ===================================================
   INSTALL
   =================================================== */
.install__note {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 48px;
  line-height: 1.6;
}
.install__steps {
  display: flex;
  flex-direction: column;
  gap: 32px;
}
.install__step {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}
.install__step-num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid rgba(212, 168, 83, 0.2);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 2px;
}
.install__step-body {
  flex: 1;
}
.install__step-body h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-headline);
  margin-bottom: 10px;
}
.install__step-body p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 12px;
  line-height: 1.6;
}

/* Code blocks */
.code-block {
  position: relative;
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.code-block pre {
  padding: 14px 18px;
  overflow-x: auto;
}
.code-block code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-primary);
  line-height: 1.5;
}
.code-block__copy {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: all 0.2s;
}
.code-block__copy:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.code-block__copy.copied {
  border-color: var(--accent);
  color: var(--accent);
}

/* Install checklist */
.install__checklist {
  list-style: none;
}
.install__checklist li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 8px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}
.install__checklist li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

/* Install examples */
.install__examples {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.install__example {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-secondary);
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  line-height: 1.5;
}

/* ===================================================
   EXAMPLE WORKFLOW
   =================================================== */
.example {
  margin-top: 40px;
}
.example__label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}
.example__quote {
  font-size: 17px;
  color: var(--text-primary);
  line-height: 1.6;
  border-left: 2px solid var(--accent);
  padding-left: 20px;
  margin-bottom: 40px;
  font-style: normal;
}
.example__cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}
.example__card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.2s;
}
.example__card:hover {
  border-color: var(--border-light);
}
.example__card-header {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 12px 16px 8px;
  border-bottom: 1px solid var(--border);
}
.example__card-body {
  padding: 12px 16px 16px;
}
.example__card-body p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* ===================================================
   FINAL CTA
   =================================================== */
.section--cta {
  background: var(--bg-base);
  text-align: center;
  padding: var(--section-pad) 0;
  border-top: 1px solid var(--border);
}
.cta__title {
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 800;
  color: var(--text-headline);
  line-height: 1.12;
  letter-spacing: -0.025em;
  margin-bottom: 16px;
}
.cta__text {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 36px;
  line-height: 1.6;
}
.cta__buttons {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* ===================================================
   FOOTER
   =================================================== */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
}
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.footer__brand {
  font-weight: 700;
  font-size: 14px;
  color: var(--text-headline);
  display: flex;
  align-items: center;
  gap: 6px;
}
.footer__links {
  display: flex;
  gap: 24px;
}
.footer__links a {
  font-size: 13px;
  color: var(--text-secondary);
  transition: color 0.2s;
}
.footer__links a:hover {
  color: var(--text-headline);
}
.footer__copy {
  font-size: 12px;
  color: var(--text-muted);
}

/* ===================================================
   RESPONSIVE
   =================================================== */
@media (max-width: 900px) {
  :root {
    --section-pad: 80px;
  }

  .hero .container {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .hero__diagram {
    display: flex;
    justify-content: center;
  }
  .hero {
    min-height: auto;
    padding-top: calc(var(--nav-height) + 60px);
  }

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

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

  .steps {
    flex-direction: column;
    gap: 12px;
  }
  .step__connector {
    width: auto;
    min-width: auto;
    height: 16px;
    align-self: center;
  }
  .step__connector::after {
    width: 1px;
    height: 100%;
  }

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

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

  .footer__inner {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}

@media (max-width: 640px) {
  :root {
    --section-pad: 64px;
  }

  .nav__links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-nav);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 16px 24px;
    gap: 12px;
  }
  .nav__links.open {
    display: flex;
  }
  .nav__toggle {
    display: flex;
  }
  .nav__link--cta {
    text-align: center;
    width: 100%;
    margin-top: 4px;
  }

  .hero__title {
    font-size: 32px;
  }

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

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