/* Variables */
:root {
  --primary: #5b8def;
  --primary-600: #3f6fd6;
  --secondary: #0ea5e9;
  --accent: #22c55e;
  --dark: #0f172a;
  --muted: #64748b;
  --bg: #f8fafc;
  --surface: #ffffff;
  --border: #e5e7eb;
  --white: #ffffff;
}

/* Dark theme variables */
html[data-theme="dark"] {
  --dark: #e5e7eb;
  --muted: #9aa4b2;
  --bg: #0b1220;
  --surface: #0f172a;
  --border: #1f2a44;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--dark);
  background: var(--bg);
}

/* Navbar */
.navbar {
  transition: box-shadow 200ms ease, background-color 200ms ease, padding 200ms ease;
}
/* Navbar gradient on scroll and border */
.navbar.is-scrolled {
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.10);
  background: linear-gradient(135deg, rgba(255,255,255,0.92), rgba(241,245,249,0.92)) !important;
  border-bottom: 1px solid var(--border);
}
html[data-theme="dark"] .navbar.is-scrolled {
  background: linear-gradient(135deg, rgba(15,23,42,0.9), rgba(2,6,23,0.9)) !important;
  border-bottom-color: #1f2a44;
}
.nav-link {
  font-weight: 600;
  position: relative;
  border-radius: 0.5rem;
  transition: color 180ms ease, background-color 180ms ease;
}
/* Use per-item accent for hover/active */
.nav-link:hover { color: var(--nav-accent, var(--primary-600)) !important; }
html[data-theme="dark"] .nav-link:hover {
  background: rgba(99, 102, 241, 0.12);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0.5rem;
  right: 0.5rem;
  bottom: 4px;
  height: 2px;
  background: linear-gradient(90deg, var(--nav-accent, #6366f1), #22d3ee);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 220ms ease;
}
.nav-link:hover::after { transform: scaleX(1); }

/* Navbar gradient bottom bar */
.navbar::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, #6366f1, #22d3ee, #22c55e, #f59e0b, #ef4444);
  opacity: 0.6;
  pointer-events: none;
}

/* Active pill styling */
.nav-link.active { color: var(--nav-accent, var(--primary)) !important; background: rgba(99, 102, 241, 0.12); box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--nav-accent, #6366f1) 35%, transparent); }
html[data-theme="dark"] .nav-link.active {
  background: rgba(99, 102, 241, 0.18);
}

/* Brand hover flair */
.navbar-brand {
  transition: transform 180ms ease, opacity 180ms ease;
}
.navbar-brand:hover { transform: translateY(-1px); opacity: 0.95; }

/* Focus-visible rings for keyboard nav */
.navbar .nav-link:focus-visible,
.navbar .btn:focus-visible,
.navbar .navbar-brand:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(99,102,241,0.3);
}

/* Toggler visual tweak */
.navbar-toggler { border: 1px solid var(--border); border-radius: 10px; padding: 6px 10px; }
.navbar-toggler:focus { box-shadow: 0 0 0 3px rgba(99,102,241,0.25); }

/* Mobile navbar reveal animation */
@keyframes navItemFade {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}
.navbar-collapse.show .nav-item { animation: navItemFade 260ms ease forwards; }
.navbar-collapse.show .nav-item:nth-child(1) { animation-delay: 40ms; }
.navbar-collapse.show .nav-item:nth-child(2) { animation-delay: 80ms; }
.navbar-collapse.show .nav-item:nth-child(3) { animation-delay: 120ms; }
.navbar-collapse.show .nav-item:nth-child(4) { animation-delay: 160ms; }
.navbar-collapse.show .nav-item:nth-child(5) { animation-delay: 200ms; }
.navbar-collapse.show .nav-item:nth-child(6) { animation-delay: 240ms; }

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  background: radial-gradient(1200px 600px at -10% -10%, #e0f2fe 0%, rgba(224,242,254,0) 60%),
    radial-gradient(1000px 500px at 110% -10%, #dbeafe 0%, rgba(219,234,254,0) 60%),
    linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
}
html[data-theme="dark"] .hero {
  background: radial-gradient(1200px 600px at -10% -10%, rgba(30,41,59,1) 0%, rgba(30,41,59,0) 60%),
    radial-gradient(1000px 500px at 110% -10%, rgba(15,23,42,1) 0%, rgba(15,23,42,0) 60%),
    linear-gradient(180deg, #0b1220 0%, #0f172a 100%);
}
.hero .badge {
  background: rgba(34, 197, 94, 0.1);
  color: var(--accent);
  border: 1px solid rgba(34, 197, 94, 0.25);
}
.hero-title {
  font-weight: 800;
  letter-spacing: -0.02em;
}
.hero-subtitle {
  color: var(--muted);
}
.cta-btn {
  padding: 0.75rem 1.25rem;
  font-weight: 700;
  border-radius: 0.75rem;
}
.btn-gradient {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border: none;
  box-shadow: 0 10px 24px rgba(59,130,246,0.25);
}
.btn-gradient:hover {
  filter: brightness(0.95);
}
.btn-soft {
  background: #eef2ff;
  color: var(--primary-600);
  border: 1px solid var(--border);
}
.btn-soft:hover {
  background: #e0e7ff;
}
html[data-theme="dark"] .btn-soft {
  background: #111827;
  color: #cbd5e1;
  border-color: var(--border);
}
html[data-theme="dark"] .btn-soft:hover {
  background: #0b1220;
}

/* Sections */
.section {
  padding: 4rem 0;
}
.section-title {
  font-weight: 800;
  letter-spacing: -0.02em;
}
.section-subtitle {
  color: var(--muted);
}

/* Cards */
.tool-card {
  border: 1px solid var(--border);
  border-radius: 1rem;
  transition: transform 200ms ease, box-shadow 200ms ease, border-color 200ms ease, background-color 200ms ease;
  background: var(--surface);
}
.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
  border-color: #dbeafe;
}
html[data-theme="dark"] .tool-card:hover {
  box-shadow: 0 16px 40px rgba(0,0,0,0.4);
  border-color: #334155;
}
.icon-badge {
  width: 48px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: #eff6ff;
  color: var(--primary-600);
}
html[data-theme="dark"] .icon-badge {
  background: #111827;
  color: #93c5fd;
}

/* Colorful accents for tool cards */
.tool-card.accent-blue { border-top: 4px solid #60a5fa; }
.tool-card.accent-purple { border-top: 4px solid #a78bfa; }
.tool-card.accent-pink { border-top: 4px solid #f472b6; }
.tool-card.accent-orange { border-top: 4px solid #fb923c; }
.tool-card.accent-green { border-top: 4px solid #34d399; }
.tool-card.accent-cyan { border-top: 4px solid #22d3ee; }

/* Icon badge variants */
.icon-badge.purple { background: #f5f3ff; color: #7c3aed; }
.icon-badge.pink { background: #fdf2f8; color: #db2777; }
.icon-badge.orange { background: #fff7ed; color: #ea580c; }
.icon-badge.green { background: #ecfdf5; color: #059669; }
.icon-badge.cyan { background: #ecfeff; color: #0891b2; }

html[data-theme="dark"] .icon-badge.purple { background: #1f1147; color: #c4b5fd; }
html[data-theme="dark"] .icon-badge.pink { background: #3f0a2b; color: #f9a8d4; }
html[data-theme="dark"] .icon-badge.orange { background: #3b2007; color: #fdba74; }
html[data-theme="dark"] .icon-badge.green { background: #06281f; color: #6ee7b7; }
html[data-theme="dark"] .icon-badge.cyan { background: #082a2f; color: #67e8f9; }

/* About feature items */
.feature {
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--surface);
  transition: transform 200ms ease, box-shadow 200ms ease, background-color 200ms ease;
}
.feature:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.06);
}
html[data-theme="dark"] .feature:hover {
  box-shadow: 0 10px 28px rgba(0,0,0,0.35);
}

/* Contact */
.form-control,
.form-select {
  border-radius: 0.75rem;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--dark);
}
.form-control:focus,
.form-select:focus {
  border-color: #bfdbfe;
  box-shadow: 0 0 0 0.25rem rgba(59, 130, 246, 0.15);
}

/* Enhanced footer */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
}
.site-footer .footer-title { font-weight: 700; font-size: 0.95rem; letter-spacing: 0.02em; text-transform: uppercase; }
.site-footer .list-unstyled li a { color: var(--muted); text-decoration: none; }
.site-footer .list-unstyled li a:hover { color: var(--primary-600); }

/* Newsletter */
.footer-newsletter .form-control { max-width: 320px; }
.footer-newsletter .form-text { color: var(--muted); }

/* Back to top */
#backToTop {
  position: fixed;
  right: 20px;
  bottom: 24px;
  z-index: 1000;
  display: none;
  border-radius: 9999px;
  box-shadow: 0 12px 24px rgba(15, 23, 42, 0.18);
}
html[data-theme="dark"] #backToTop { box-shadow: 0 12px 24px rgba(0,0,0,0.5); }

/* Reveal on scroll */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 500ms ease, transform 500ms ease;
}
[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Utilities */
.text-muted-700 { color: var(--muted); }
.rounded-xl { border-radius: 1rem; }
.shadow-soft { box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06); }

/* Spacing helpers for fixed navbar offset */
.header-spacer { height: 72px; }

@media (min-width: 992px) {
  .header-spacer { height: 84px; }
}