/*───────────────────────────
  VARIABLES & RESET
────────────────────────────*/
:root {
  --gradient-bg: linear-gradient(to right, #ff0055, #5500ff);
  --text: #fff;
  --accent1: #00ff99;
  --accent2: #cc00ff;
  --font: "Inter", sans-serif;
  --glass-bg: rgba(255, 255, 255, 0.15);
  --glass-border: rgba(255, 255, 255, 0.25);
  --transition: 0.3s ease;
}
body.light-theme {
  --gradient-bg: #fafafa;
  --text: #1a1a2e;
}
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  font-size: 16px;
}
body {
  background: var(--gradient-bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.5;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* GLASS UTILS */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
}

/* TOOLTIP */
[data-tooltip] {
  position: relative;
  cursor: help;
}
[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.8);
  color: #fff;
  padding: 4px 8px;
  border-radius: 4px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
  font-size: 0.85rem;
  z-index: 100;
}
[data-tooltip]:hover::after,
[data-tooltip]:focus::after {
  opacity: 1;
}

/*───────────────────────────
  LOADER & BACK-TO-TOP
────────────────────────────*/
#loader {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
}
.spinner {
  width: 4rem;
  height: 4rem;
  border: 6px solid rgba(255, 255, 255, 0.2);
  border-top-color: var(--accent1);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

#backToTop {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 3rem;
  height: 3rem;
  font-size: 1.2rem;
  background: var(--accent1);
  color: #000;
  border: none;
  border-radius: 50%;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}
#backToTop.show {
  opacity: 1;
  pointer-events: auto;
}

/*───────────────────────────
  HEADER & NAV
────────────────────────────*/
#site-header {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  transition: padding var(--transition), background var(--transition);
}
#site-header.scrolled {
  padding: 0.3rem 0;
}
.navbar {
  max-width: 1200px;
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
}
.logo {
  font-weight: 800;
  font-size: 1.6rem;
  color: var(--accent1);
}
.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  align-items: center;
}
.nav-links a,
.settings-btn {
  background: none;
  border: none;
  color: var(--text);
  font-weight: 600;
  text-decoration: none;
  position: relative;
  transition: color var(--transition);
}
.nav-links a::after,
.settings-btn::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent1);
  transition: width var(--transition);
}
.nav-links a:hover,
.nav-links a:focus,
.settings-btn:hover,
.settings-btn:focus {
  color: var(--accent1);
}
.nav-links a:hover::after,
.nav-links a:focus::after,
.settings-btn:hover::after,
.settings-btn:focus::after {
  width: 100%;
}
.theme-toggle {
  background: none;
  border: none;
  font-size: 1.2rem;
  color: var(--text);
  cursor: pointer;
  margin-left: 1rem;
  transition: color var(--transition);
}
.theme-toggle:hover,
.theme-toggle:focus {
  color: var(--accent2);
}

/* BURGER + LIQUID CANVAS */
.burger {
  display: none;
  position: relative;
  background: none;
  border: none;
  cursor: pointer;
  margin-left: 1rem;
  width: 32px;
  height: 32px;
}
.burger svg .line {
  fill: none;
  stroke: var(--accent1);
  stroke-width: 8;
  stroke-linecap: round;
  transition: transform 0.4s var(--transition),
    opacity 0.2s var(--transition);
}
.burger.open .line1 {
  transform: translate(0, 20px) rotate(45deg);
}
.burger.open .line2 {
  opacity: 0;
}
.burger.open .line3 {
  transform: translate(0, -20px) rotate(-45deg);
}
#burgerCanvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 32px;
  height: 32px;
  pointer-events: none;
}

/*───────────────────────────
  MOBILE MENU
────────────────────────────*/
.mobile-menu {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transform: translateY(-100%);
  transition: transform 0.4s ease-in-out;
  z-index: 999;
}
.mobile-menu.open {
  transform: translateY(0);
}
.mobile-close {
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  font-size: 2rem;
  background: none;
  border: none;
  color: var(--accent2);
  cursor: pointer;
}
.mobile-menu ul {
  list-style: none;
  text-align: center;
}
.mobile-menu a {
  display: block;
  font-size: 1.5rem;
  color: var(--accent1);
  text-decoration: none;
  padding: 0.5rem;
  transition: color var(--transition);
}
.mobile-menu a:hover,
.mobile-menu a:focus {
  color: var(--accent2);
}

/*───────────────────────────
  SETTINGS & SAMPLE MODAL
────────────────────────────*/
.settings-modal,
.modal {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 1500;
}
.settings-modal.open,
.modal.open {
  display: flex;
}
.settings-content,
.modal-content {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  padding: 2rem;
  text-align: center;
  max-width: 400px;
  width: 100%;
}
.settings-list {
  list-style: none;
  margin: 1rem 0;
  text-align: left;
}
.settings-list li {
  margin: 0.5rem 0;
}
.settings-list input {
  margin-right: 0.5rem;
}

/*───────────────────────────
  HERO SECTION
────────────────────────────*/
.hero {
  position: relative;
  height: 100vh;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  margin-top: 5rem;
}
#heroCanvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
.hero-content {
  position: relative;
  z-index: 2;
  padding: 0 1rem;
}
.hero-content h1 {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--accent1);
}
.hero-content p {
  font-size: 1.2rem;
  margin: 1rem 0;
}

/*───────────────────────────
  DIVIDERS
────────────────────────────*/
.divider {
  width: 100%;
  overflow: hidden;
  line-height: 0;
}
.divider.flip svg {
  transform: rotate(180deg);
}

/*───────────────────────────
  SECTIONS & CARDS
────────────────────────────*/
.section {
  padding: 4rem 1.5rem;
  max-width: 1200px;
  margin: auto;
}
.section h2 {
  text-align: center;
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 2rem;
}
.effects-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}
.effect-card {
  position: relative;
  background: rgba(0, 0, 0, 0.4);
  padding: 2rem;
  border-radius: 8px;
  text-align: center;
  font-weight: 600;
  cursor: default;
  transition: transform var(--transition),
    box-shadow var(--transition);
}
.effect-card:hover,
.effect-card:focus {
  transform: translateY(-6px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
}
/* neon-glow */
.neon-glow:hover {
  border: 2px solid var(--accent1);
  box-shadow: 0 0 16px var(--accent1);
}
/* gradient-fade */
.gradient-fade::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(45deg, var(--accent1), var(--accent2));
  opacity: 0;
  transition: opacity var(--transition);
}
.gradient-fade:hover::before {
  opacity: 0.4;
}
/* pulse */
@keyframes cardPulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.04);
  }
}
.pulse-effect:hover {
  animation: cardPulse 0.8s ease-in-out infinite;
}
/* shape-morph */
.shape-morph {
  clip-path: polygon(10% 0, 90% 0, 100% 100%, 0 100%);
  transition: clip-path var(--transition);
}
.shape-morph:hover {
  clip-path: polygon(0 10%, 100% 0, 90% 100%, 10% 90%);
}
/* ripple-effect */
.ripple-effect {
  overflow: hidden;
}
.ripple-effect::after {
  content: "";
  position: absolute;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transition: width 0.6s ease, height 0.6s ease, top var(--transition),
    left var(--transition);
}
.ripple-effect:active::after {
  width: 200px;
  height: 200px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/*───────────────────────────
  BUTTONS & CANVAS
────────────────────────────*/
.buttons-grid {
  display: flex;
  gap: 2rem;
  justify-content: center;
  flex-wrap: wrap;
}
.btn {
  position: relative;
  overflow: hidden;
  padding: 0.8rem 1.8rem;
  font-weight: 600;
  border: none;
  border-radius: 4px;
  min-height: 48px;
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition);
}
.btn-primary {
  background: var(--accent1);
  color: #000;
  box-shadow: 0 0 10px var(--accent1);
}
.btn-primary:hover,
.btn-primary:focus {
  background: var(--accent2);
  box-shadow: 0 0 16px var(--accent2);
}
.btn-neon {
  background: linear-gradient(90deg, var(--accent1), var(--accent2));
  color: #000;
  box-shadow: 0 0 10px var(--accent1), 0 0 20px var(--accent2);
}
.btn-neon:hover,
.btn-neon:focus {
  box-shadow: 0 0 16px var(--accent1), 0 0 32px var(--accent2);
}
/* button canvas */
.btnCanvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}
.btn span {
  position: relative;
  z-index: 1;
}
/* ripple JS */
.ripple {
  overflow: hidden;
}

/*───────────────────────────
  CTA & FOOTER
────────────────────────────*/
.cta-section {
  text-align: center;
}
.cta-section p {
  max-width: 600px;
  margin: 1rem auto 2rem;
}
.footer {
  background: transparent;
  border-top: 1px solid var(--glass-border);
  padding: 2rem 1.5rem;
  margin-top: 2rem;
}
.footer-content {
  max-width: 1100px;
  margin: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  justify-content: space-between;
  align-items: center;
}
.social-media a {
  margin-right: 1rem;
  display: inline-block;
  transition: transform var(--transition),
    filter var(--transition);
}
.social-media a:hover svg {
  filter: drop-shadow(0 0 6px var(--accent1));
  transform: scale(1.1);
}
.footer-links {
  list-style: none;
  display: flex;
  gap: 1rem;
}
.footer-links a {
  color: var(--text);
  text-decoration: none;
  transition: color var(--transition);
}
.footer-links a:hover,
.footer-links a:focus {
  color: var(--accent1);
}
.newsletter {
  display: flex;
  gap: 0.5rem;
}
.newsletter input {
  padding: 0.6rem 0.8rem;
  border: none;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  transition: background var(--transition);
}
.newsletter input:focus {
  background: rgba(255, 255, 255, 0.4);
  outline: 2px solid var(--accent1);
}
.footer-copy {
  text-align: center;
  margin-top: 1rem;
  font-size: 0.9rem;
}

/*───────────────────────────
  RESPONSIVE
────────────────────────────*/
@media (max-width: 1024px) {
  .navbar {
    padding: 0.8rem 1rem;
  }
  .btn {
    padding: 0.8rem 1.2rem;
    font-size: 0.9rem;
  }
}
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .burger {
    display: block;
  }
  .section {
    padding: 3rem 1rem;
  }
  .effects-grid {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  }
}
@media (max-width: 640px) {
  html {
    font-size: 14px;
  }
  .hero-content h1 {
    font-size: 2.2rem;
  }
  .hero-content p {
    font-size: 1rem;
  }
  .buttons-grid {
    flex-direction: column;
  }
}