/* ── DARK THEME TOKENS ────────────────────── */
[data-theme="dark"] {
  --bg:         #0b0d12;
  --bg-soft:    #11141b;
  --card-bg:    #13161f;
  --surface:    #161922;
  --border:     #1f242f;
  --border-strong: #2a2f3c;

  --text:       #e5e7ef;
  --text-soft:  #cbd0db;
  --muted:      #8b91a3;
  --muted-2:    #5e6473;

  --accent:     #a78bfa;
  --accent-2:   #8b5cf6;
  --accent-soft: rgba(167,139,250,0.12);
  --accent-ring: rgba(167,139,250,0.25);

  --shadow-sm:  0 1px 2px rgba(0,0,0,0.4);
  --shadow:     0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md:  0 4px 12px rgba(0,0,0,0.45), 0 2px 4px rgba(0,0,0,0.35);
  --shadow-lg:  0 12px 32px rgba(0,0,0,0.55), 0 4px 8px rgba(0,0,0,0.35);
  --shadow-accent: 0 8px 24px rgba(139,92,246,0.4);
}


/* ── DARK MODE — element overrides ────────── */
[data-theme="dark"] nav {
  background: rgba(11,13,18,0.85);
  border-bottom-color: var(--border);
}
[data-theme="dark"] nav.is-scrolled {
  background: rgba(11,13,18,0.95);
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}
[data-theme="dark"] .nav-logo .brand,
[data-theme="dark"] .nav-logo .brand-accent { color: var(--text); }
[data-theme="dark"] .nav-logo .brand-sub { color: var(--muted); }
[data-theme="dark"] .nav-logo .logo-mark path:first-of-type {
  fill: url(#logo-grad-light);
}
[data-theme="dark"] .nav-logo .logo-mark path:last-of-type {
  fill: #0b0d12;
}

/* Hero gradient */
[data-theme="dark"] .hero {
  background:
    radial-gradient(ellipse 1000px 600px at 50% 0%, rgba(139,92,246,0.12) 0%, transparent 60%),
    radial-gradient(ellipse 700px 500px at 15% 30%, rgba(99,102,241,0.08) 0%, transparent 60%),
    radial-gradient(ellipse 700px 500px at 85% 25%, rgba(167,139,250,0.08) 0%, transparent 60%),
    linear-gradient(180deg, #0b0d12 0%, #0d1018 100%);
}
[data-theme="dark"] .hero-grid {
  background-image:
    linear-gradient(rgba(167,139,250,0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(167,139,250,0.07) 1px, transparent 1px);
}
[data-theme="dark"] .hero-badge { background: var(--surface); border-color: var(--border); }
[data-theme="dark"] .stat {
  background: rgba(22,25,34,0.7);
  border-color: var(--border);
}

/* Buttons */
[data-theme="dark"] .btn-primary {
  background: var(--accent-2);
  color: #fff;
  box-shadow: 0 8px 24px rgba(139,92,246,0.35);
}
[data-theme="dark"] .btn-primary:hover {
  background: var(--accent);
  box-shadow: 0 12px 32px rgba(167,139,250,0.45);
}
[data-theme="dark"] .nav-btn {
  background: var(--accent-2);
}
[data-theme="dark"] .nav-btn:hover { background: var(--accent); }
[data-theme="dark"] .btn-secondary {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border-strong);
}
[data-theme="dark"] .btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--surface);
}

/* Cards (universal white -> surface) */
[data-theme="dark"] .uc-step,
[data-theme="dark"] .feature-card,
[data-theme="dark"] .wf-item,
[data-theme="dark"] .adv-item,
[data-theme="dark"] .contact-card,
[data-theme="dark"] .testimonial-card,
[data-theme="dark"] .faq-item,
[data-theme="dark"] .dl-card,
[data-theme="dark"] .t-stat,
[data-theme="dark"] .footer-status {
  background: var(--surface);
  border-color: var(--border);
}
[data-theme="dark"] .uc-step:hover,
[data-theme="dark"] .feature-card:hover,
[data-theme="dark"] .wf-item:hover,
[data-theme="dark"] .adv-item:hover,
[data-theme="dark"] .contact-card:hover,
[data-theme="dark"] .testimonial-card:hover,
[data-theme="dark"] .faq-item:hover {
  border-color: var(--accent);
  background: var(--surface);
}

/* Specific accent backgrounds */
[data-theme="dark"] .uc-icon,
[data-theme="dark"] .feature-icon,
[data-theme="dark"] .wf-item-icon,
[data-theme="dark"] .adv-icon {
  background: rgba(167,139,250,0.14);
  border-color: rgba(167,139,250,0.25);
}

/* Highlight cards (have gradient backgrounds) */
[data-theme="dark"] .dl-card-windows,
[data-theme="dark"] .dl-card-mac,
[data-theme="dark"] .testimonial-featured,
[data-theme="dark"] .contact-card-highlight {
  background: linear-gradient(180deg, var(--surface) 0%, rgba(167,139,250,0.06) 100%);
  border-color: rgba(167,139,250,0.3);
}
[data-theme="dark"] .dl-card-soon {
  background: rgba(22,25,34,0.5);
  border-color: var(--border-strong);
}
[data-theme="dark"] .dl-card-meta {
  background: rgba(0,0,0,0.25);
  border-color: var(--border);
}
[data-theme="dark"] .dl-card-soon .dl-card-meta {
  background: rgba(0,0,0,0.15);
}

/* Feature tags */
[data-theme="dark"] .feature-tag {
  background: rgba(16,185,129,0.12);
  border-color: rgba(16,185,129,0.3);
  color: #34d399;
}
[data-theme="dark"] .feature-tag.purple {
  background: rgba(167,139,250,0.14);
  border-color: rgba(167,139,250,0.3);
  color: #c4b5fd;
}
[data-theme="dark"] .feature-tag.orange {
  background: rgba(249,115,22,0.12);
  border-color: rgba(249,115,22,0.3);
  color: #fb923c;
}
[data-theme="dark"] .feature-tag.teal {
  background: rgba(20,184,166,0.12);
  border-color: rgba(20,184,166,0.3);
  color: #2dd4bf;
}

/* Use case + uc-highlight */
[data-theme="dark"] .uc-highlight,
[data-theme="dark"] .contact-pill,
[data-theme="dark"] .dl-os-badge-soon {
  background: rgba(167,139,250,0.14);
  border-color: rgba(167,139,250,0.3);
  color: #c4b5fd;
}
[data-theme="dark"] .dl-os-badge-live {
  background: rgba(16,185,129,0.14);
  border-color: rgba(16,185,129,0.3);
  color: #34d399;
}

/* Steps */
[data-theme="dark"] .steps-grid::before {
  background: repeating-linear-gradient(90deg, var(--border-strong) 0 6px, transparent 6px 12px);
}
[data-theme="dark"] .step {
  background: var(--bg-soft);
}
[data-theme="dark"] .step-num {
  background: var(--surface);
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 0 6px var(--bg-soft), var(--shadow-md);
}

/* Section labels accent */
[data-theme="dark"] .section-label { color: var(--accent); }
[data-theme="dark"] .section-label::before,
[data-theme="dark"] .section-label::after { background: var(--accent); }

/* FAQ */
[data-theme="dark"] .faq-item[open] {
  background: linear-gradient(180deg, var(--surface) 0%, rgba(167,139,250,0.04) 100%);
  border-color: rgba(167,139,250,0.3);
}
[data-theme="dark"] .faq-icon { background: var(--bg-soft); border-color: var(--border-strong); }
[data-theme="dark"] .faq-icon::before,
[data-theme="dark"] .faq-icon::after { background: var(--text-soft); }
[data-theme="dark"] .faq-item:hover .faq-icon { background: rgba(167,139,250,0.14); border-color: var(--accent); }
[data-theme="dark"] .faq-item:hover .faq-icon::before,
[data-theme="dark"] .faq-item:hover .faq-icon::after { background: var(--accent); }
[data-theme="dark"] .faq-item[open] .faq-icon { background: var(--accent); border-color: var(--accent); }
[data-theme="dark"] .faq-item[open] .faq-icon::before,
[data-theme="dark"] .faq-item[open] .faq-icon::after { background: #fff; }
[data-theme="dark"] .faq-link { border-bottom-color: rgba(167,139,250,0.3); }
[data-theme="dark"] .faq-link:hover { border-bottom-color: var(--accent); }

/* Workflow code */
[data-theme="dark"] .wf-item p code {
  background: rgba(167,139,250,0.14);
  color: #c4b5fd;
}

/* CTA */
[data-theme="dark"] .cta-section {
  background:
    radial-gradient(ellipse 600px 300px at 50% 50%, rgba(139,92,246,0.18) 0%, transparent 70%),
    linear-gradient(180deg, var(--bg) 0%, #0d1018 100%);
}

/* Footer status badge */
[data-theme="dark"] .footer-status {
  background: var(--surface);
  border-color: var(--border);
  color: var(--text-soft);
}

/* hero stat block transparency */
[data-theme="dark"] .stat-num {
  background: linear-gradient(135deg, #a78bfa, #c4b5fd);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
[data-theme="dark"] .t-stat-num {
  background: linear-gradient(135deg, #a78bfa, #c4b5fd);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
[data-theme="dark"] .hero h1 .accent-text {
  background: linear-gradient(120deg, #a78bfa 0%, #c4b5fd 50%, #8b5cf6 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}


/* Smooth theme transitions */
html { transition: background-color .3s ease; }
body, nav, .feature-card, .uc-step, .wf-item, .adv-item,
.contact-card, .testimonial-card, .faq-item, .dl-card, .t-stat,
.footer-status, .step, .btn-secondary, .nav-btn, .btn-primary {
  transition: background-color .3s ease, border-color .3s ease, color .3s ease;
}

/* ══════════════════════════════════════════════
   HAMBURGER BUTTON
══════════════════════════════════════════════ */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 38px; height: 38px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-soft);
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}
.nav-hamburger span {
  display: block;
  width: 18px; height: 2px;
  background: var(--text-soft);
  border-radius: 2px;
  transition: transform .3s, opacity .2s, width .2s;
}
.nav-hamburger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.is-open span:nth-child(2) { opacity: 0; width: 0; }
.nav-hamburger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ══════════════════════════════════════════════
   MOBILE MENU OVERLAY
══════════════════════════════════════════════ */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 99;
  background: var(--bg);
  overflow-y: auto;
  padding: 80px 24px 40px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease;
}
.mobile-menu.is-open {
  opacity: 1;
  pointer-events: all;
}
.mobile-menu-inner {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-width: 480px;
  margin: 0 auto;
}
.mobile-link {
  display: block;
  padding: 16px 0;
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  transition: color .2s, padding-left .2s;
}
.mobile-link:last-of-type { border-bottom: none; }
.mobile-link:hover { color: var(--accent); padding-left: 8px; }
.mobile-cta {
  margin-top: 24px;
  width: 100%;
  justify-content: center;
  font-size: 16px;
  padding: 16px 24px;
}

/* ══════════════════════════════════════════════
   MOBILE — show hamburger, hide desktop nav
══════════════════════════════════════════════ */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-btn   { display: none; }
  .nav-hamburger { display: flex; }
  .mobile-menu   { display: block; }

  /* tighter nav padding */
  nav { padding: 12px 16px; }
}

/* ══════════════════════════════════════════════
   MOBILE — HERO
══════════════════════════════════════════════ */
@media (max-width: 480px) {
  .hero { padding: 110px 16px 60px; }
  .hero h1 {
    font-size: clamp(30px, 9vw, 40px);
    letter-spacing: -0.8px;
    margin-bottom: 16px;
  }
  .hero-sub {
    font-size: 15px;
    margin-bottom: 28px;
  }
  .hero-badge { font-size: 12px; padding: 5px 12px 5px 6px; }
  .hero-actions { flex-direction: column; gap: 10px; }
  .hero-actions .btn-primary,
  .hero-actions .btn-secondary {
    width: 100%;
    justify-content: center;
    padding: 14px 20px;
  }
  .hero-note { gap: 10px; font-size: 12px; }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-top: 40px;
  }
  .stat { padding: 14px 10px; }
  .stat-num { font-size: 26px; }
  .stat-label { font-size: 13px; }
}

/* ══════════════════════════════════════════════
   MOBILE — SECTIONS
══════════════════════════════════════════════ */
@media (max-width: 480px) {
  .section { padding: 56px 16px; }
  .section-title { font-size: clamp(22px, 7vw, 30px); letter-spacing: -0.5px; }
  .section-sub { font-size: 15px; margin-bottom: 40px; }

  /* use-case: single column on tiny screens */
  .usecase-flow { grid-template-columns: 1fr; gap: 10px; }
  .uc-step + .uc-step { margin-left: 0; }

  /* features */
  .features-grid { grid-template-columns: 1fr; gap: 12px; }
  .feature-card { padding: 20px 18px; }
  .feature-card h3 { font-size: 15px; }

  /* workflow */
  .workflow-features { grid-template-columns: 1fr; gap: 10px; }
  .wf-item { padding: 16px 18px; }

  /* advanced */
  .advanced-grid { grid-template-columns: 1fr; gap: 8px; }

  /* steps */
  .steps-grid { grid-template-columns: 1fr; gap: 24px; }
  .steps-grid::before { display: none; }
  .step-num { width: 48px; height: 48px; font-size: 18px; }

  /* testimonials */
  .testimonials-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    max-width: 100%;
    margin-bottom: 32px;
  }
  .t-stat { padding: 14px 10px; }
  .t-stat-label { font-size: 13px; }
  .testimonials-grid { grid-template-columns: 1fr; gap: 12px; }
  .testimonial-featured { grid-column: span 1; }
  .testimonial-featured .t-quote { font-size: 15px; }
  .testimonial-card { padding: 18px; }

  /* download */
  .download-grid { grid-template-columns: 1fr; }
  .dl-card { padding: 20px; }

  /* faq — 44px min touch target */
  .faq-item summary { padding: 14px 16px; font-size: 14px; min-height: 44px; }
  .faq-a { padding: 0 16px 16px; }
  .faq-a p { font-size: 14px; }

  /* contact */
  .contact-grid { grid-template-columns: 1fr; max-width: 100%; margin-top: 32px; }
  .contact-card { padding: 16px; }
  .contact-icon { width: 44px; height: 44px; border-radius: 12px; }
  .contact-value { font-size: 15px; }

  /* CTA */
  .cta-section { padding: 64px 16px; }
  .cta-section h2 { font-size: clamp(22px, 7vw, 32px); }
  .cta-section p { font-size: 15px; }

  /* footer */
  .footer-inner { padding: 40px 16px 20px; }
  .footer-cols  { grid-template-columns: 1fr; gap: 24px; padding-bottom: 28px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 10px; }
  .footer-bottom-meta { font-size: 12px; }
  .footer-bottom-right { gap: 14px; }
}

/* ══════════════════════════════════════════════
   DARK MODE — hamburger & mobile menu
══════════════════════════════════════════════ */
[data-theme="dark"] .nav-hamburger {
  background: var(--surface);
  border-color: var(--border);
}
[data-theme="dark"] .nav-hamburger span { background: var(--text-soft); }
[data-theme="dark"] .mobile-menu { background: var(--bg); }
[data-theme="dark"] .mobile-link { color: var(--text); border-bottom-color: var(--border); }
[data-theme="dark"] .mobile-link:hover { color: var(--accent); }