/* ============================================
   Bonut Labs — Shared Styles
   Used by all pages (index, about, stats)
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@300;400;500;600&display=swap');

/* ── Dark theme tokens (default) ── */
:root {
  --bg:          #282a36;
  --bg-darker:   #1e1f29;
  --current:     #44475a;
  --fg:          #f8f8f2;
  --comment:     #6272a4;
  --pink:        #ff79c6;
  --green:       #50fa7b;
  --purple:      #bd93f9;
  --cyan:        #8be9fd;
  --yellow:      #f1fa8c;
  --orange:      #ffb86c;
  --red:         #ff5555;

  --font-heading: 'Space Grotesk', sans-serif;
  --font-body:    'Inter', sans-serif;

  --radius:      12px;
  --radius-sm:   8px;
  --transition:  .3s cubic-bezier(.4,0,.2,1);
}

/* ── Light theme tokens ── */
[data-theme="light"] {
  --bg:        #f4f4f8;
  --bg-darker: #e8e8ef;
  --current:   #d8d8e4;
  --fg:        #282a36;
  --comment:   #555770;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
}

img { max-width: 100%; display: block; }
a   { text-decoration: none; color: inherit; }

/* ── Utility ── */
.container {
  width: min(1120px, 90%);
  margin: 0 auto;
}

.section-heading {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  color: var(--pink);
  margin-bottom: .35em;
}
.section-sub {
  color: var(--comment);
  font-size: 1.05rem;
  margin-bottom: 2.5rem;
}

/* ── Fade-in animation ── */
.fade-section {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity .7s ease, transform .7s ease;
}
.fade-section.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Staggered child animations ── */
.stagger-item {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .5s ease, transform .5s ease;
}
.stagger-item.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   NAV
   ============================================ */
.top-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 1rem 0;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(40,42,54,.72);
  border-bottom: 1px solid rgba(98,114,164,.25);
  transition: background var(--transition);
}
[data-theme="light"] .top-nav {
  background: rgba(244,244,248,.82);
  border-bottom-color: rgba(98,114,164,.2);
}
.top-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--pink);
  letter-spacing: -0.02em;
}
.nav-links {
  display: flex;
  gap: .75rem;
  list-style: none;
  align-items: center;
}
.nav-links a {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .5rem 1.15rem;
  font-size: .88rem;
  font-weight: 500;
  border-radius: 999px;
  border: 1px solid var(--comment);
  color: var(--fg);
  transition: all var(--transition);
}
.nav-links a:hover {
  border-color: var(--pink);
  box-shadow: 0 0 14px rgba(255,121,198,.3);
  color: var(--pink);
}
.nav-links a.active {
  border-color: var(--purple);
  color: var(--purple);
}

/* ── Theme toggle button ── */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--comment);
  background: none;
  cursor: pointer;
  color: var(--fg);
  font-size: 1rem;
  transition: all var(--transition);
  flex-shrink: 0;
}
.theme-toggle:hover {
  border-color: var(--yellow);
  color: var(--yellow);
  box-shadow: 0 0 12px rgba(241,250,140,.3);
}
.theme-toggle .icon-moon { display: block; }
.theme-toggle .icon-sun  { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-sun  { display: block; }

/* ============================================
   HAMBURGER MENU
   ============================================ */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: 1px solid var(--comment);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 6px;
  transition: all var(--transition);
  z-index: 110;
}
.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--fg);
  border-radius: 2px;
  transition: all var(--transition);
}
.hamburger:hover {
  border-color: var(--pink);
}
.hamburger.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.hamburger.open span:nth-child(2) {
  opacity: 0;
}
.hamburger.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   BACK TO TOP BUTTON
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 90;
  width: 48px;
  height: 48px;
  border: none;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--pink), var(--purple));
  color: var(--bg);
  font-size: 1.3rem;
  font-weight: 700;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(255,121,198,.3);
}
.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(255,121,198,.5);
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  position: relative;
  padding: 3rem 0 2rem;
  text-align: center;
  color: var(--comment);
  font-size: .85rem;
}
.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(600px, 80%);
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--pink), var(--purple), var(--cyan), transparent);
  border-radius: 2px;
  animation: footerGradient 6s ease infinite;
  background-size: 200% 100%;
}
@keyframes footerGradient {
  0%, 100% { background-position: 0% 50%; }
  50%      { background-position: 100% 50%; }
}
.footer-logo {
  font-size: 1.5rem;
  margin-bottom: .5rem;
}
.footer-logo-text {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.05rem;
  background: linear-gradient(135deg, var(--pink), var(--purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-socials {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin: 1.25rem 0;
}
.footer-socials a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--comment);
  color: var(--fg);
  transition: all var(--transition);
}
.footer-socials a:hover {
  border-color: var(--pink);
  color: var(--pink);
  box-shadow: 0 0 18px rgba(255,121,198,.3);
  transform: translateY(-3px);
}
.footer-socials svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}
.footer-copy {
  color: var(--comment);
  font-size: .82rem;
}

/* ============================================
   RESPONSIVE — shared mobile nav
   ============================================ */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(40,42,54,.96);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(98,114,164,.25);
    padding: .5rem 0;
  }
  [data-theme="light"] .nav-links {
    background: rgba(244,244,248,.97);
  }
  .nav-links.open {
    display: flex;
  }
  .nav-links li {
    width: 100%;
  }
  .nav-links a {
    border: none;
    border-radius: 0;
    padding: .85rem 1.5rem;
    font-size: .95rem;
    width: 100%;
    justify-content: flex-start;
  }
  .nav-links a:hover {
    background: rgba(189,147,249,.08);
    box-shadow: none;
  }
}