/* ========== RESET & ROOT ========== */
:root {
  --bg: #050510;
  --bg-alt: #0a0a1a;
  --bg-card: rgba(255,255,255,0.04);
  --bg-card-hover: rgba(255,255,255,0.08);
  --ink: #e8e6f0;
  --ink-dim: #8886a0;
  --muted: #5c5a78;
  --line: rgba(255,255,255,0.06);
  --accent: #6c5ce7;
  --accent-2: #00d2ff;
  --accent-3: #ff6b9d;
  --green: #00e676;
  --orange: #ff9100;
  --red: #ff1744;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-card: 0 8px 32px rgba(0,0,0,0.3);
  --font: "Inter", system-ui, sans-serif;
  --display: "Space Grotesk", "Inter", system-ui, sans-serif;
  --mono: "JetBrains Mono", monospace;
  --container: 1120px;
  --header-h: 72px;
  --transition: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.light {
  --bg: #f5f3ff;
  --bg-alt: #ede9fe;
  --bg-card: rgba(0,0,0,0.04);
  --bg-card-hover: rgba(0,0,0,0.07);
  --ink: #1a1a2e;
  --ink-dim: #5c5a78;
  --muted: #a5a3b8;
  --line: rgba(0,0,0,0.08);
  --shadow-card: 0 8px 32px rgba(0,0,0,0.08);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
}

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

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

::selection {
  background: var(--accent);
  color: #fff;
}

/* ========== SCROLL PROGRESS ========== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--accent-3));
  z-index: 1000;
  transition: width 0.1s linear;
}

/* ========== PARTICLE CANVAS ========== */
#particleCanvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.6;
}

.light #particleCanvas {
  opacity: 0.3;
}

/* ========== HEADER ========== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: transparent;
  transition: background 0.3s, box-shadow 0.3s;
  height: var(--header-h);
}

.header.scrolled {
  background: rgba(5,5,16,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--line);
}

.light .header.scrolled {
  background: rgba(245,243,255,0.85);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.logo-icon {
  font-size: 1.5rem;
  color: var(--accent-2);
}

.logo-text span {
  color: var(--accent);
}

.nav {
  display: flex;
  gap: 4px;
}

.nav-link {
  padding: 8px 16px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink-dim);
  border-radius: 8px;
  transition: all var(--transition);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--ink);
  background: var(--bg-card);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Theme Toggle */
.theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 50%;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--ink-dim);
  transition: all var(--transition);
}

.theme-toggle:hover {
  color: var(--ink);
  background: var(--bg-card-hover);
}

.theme-toggle .moon,
.light .theme-toggle .sun {
  display: none;
}

.light .theme-toggle .moon {
  display: block;
}

/* Burger */
.burger {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: all 0.3s;
}

.burger.open span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.burger.open span:nth-child(2) {
  opacity: 0;
}
.burger.open span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ========== HERO ========== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  z-index: 1;
  padding: 120px 0 60px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  width: 100%;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(108,92,231,0.12);
  border: 1px solid rgba(108,92,231,0.25);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-2);
  margin-bottom: 24px;
  letter-spacing: 0.02em;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-title {
  font-family: var(--display);
  font-size: clamp(2.5rem, 5vw, 4.2rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.reveal-text {
  display: block;
  animation: fadeUp 0.8s ease-out;
}

.grad-text {
  background: linear-gradient(135deg, var(--accent), var(--accent-2), var(--accent-3));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.grad {
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--ink-dim);
  margin-bottom: 32px;
  max-width: 540px;
}

.hero-cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
  font-family: var(--font);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #8b7cf7);
  color: #fff;
  box-shadow: 0 4px 20px rgba(108,92,231,0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(108,92,231,0.5);
}

.btn-ghost {
  background: var(--bg-card);
  color: var(--ink);
  border: 1px solid var(--line);
}

.btn-ghost:hover {
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.hero-stats {
  display: flex;
  gap: 32px;
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-num {
  font-family: var(--display);
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--ink), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.stat-plus,
.stat-perc {
  font-family: var(--display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent-2);
  margin-left: 2px;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Brain Visualization */
.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.brain-container {
  position: relative;
  width: 340px;
  height: 340px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.brain-ring {
  position: absolute;
  border: 1px solid rgba(108,92,231,0.15);
  border-radius: 50%;
  animation: spin 20s linear infinite;
}

.brain-ring-2 {
  width: 280px;
  height: 280px;
  border-color: rgba(0,210,255,0.12);
  animation-duration: 25s;
  animation-direction: reverse;
}

.brain-ring-3 {
  width: 200px;
  height: 200px;
  border-color: rgba(255,107,157,0.1);
  animation-duration: 15s;
}

.brain-core {
  font-size: 3.5rem;
  animation: pulse-glow 3s ease-in-out infinite;
  z-index: 2;
  filter: drop-shadow(0 0 30px rgba(108,92,231,0.5));
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes pulse-glow {
  0%, 100% { transform: scale(1); filter: drop-shadow(0 0 20px rgba(108,92,231,0.3)); }
  50% { transform: scale(1.1); filter: drop-shadow(0 0 40px rgba(108,92,231,0.6)); }
}

.brain-ring::before {
  content: '';
  position: absolute;
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  top: -4px;
  left: 50%;
  box-shadow: 0 0 10px var(--accent);
}

.brain-ring-2::before {
  background: var(--accent-2);
  box-shadow: 0 0 10px var(--accent-2);
}

.brain-ring-3::before {
  background: var(--accent-3);
  box-shadow: 0 0 10px var(--accent-3);
}

.scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  animation: bounce-down 2s infinite;
}

.scroll-mouse {
  width: 26px;
  height: 40px;
  border: 2px solid var(--muted);
  border-radius: 13px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
}

.scroll-wheel {
  width: 3px;
  height: 8px;
  background: var(--accent-2);
  border-radius: 3px;
  animation: scroll-move 2s infinite;
}

@keyframes scroll-move {
  0% { transform: translateY(0); opacity: 1; }
  100% { transform: translateY(12px); opacity: 0; }
}

@keyframes bounce-down {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ========== SECTIONS ========== */
.section {
  padding: 100px 0;
  position: relative;
  z-index: 1;
}

.section.alt {
  background: var(--bg-alt);
}

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 60px;
}

.section-tag {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(108,92,231,0.1);
  border: 1px solid rgba(108,92,231,0.2);
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-2);
  margin-bottom: 16px;
}

.section-head h2 {
  font-family: var(--display);
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-head p {
  color: var(--ink-dim);
  font-size: 1.05rem;
}

/* ========== TIMELINE ========== */
.timeline {
  position: relative;
  max-width: 720px;
  margin: 0 auto;
}

.timeline-line {
  position: absolute;
  left: 32px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--line);
}

.timeline-line::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 0%;
  background: linear-gradient(to bottom, var(--accent), var(--accent-2), var(--accent-3));
  transition: height 1.5s ease-out;
}

.timeline-line.visible::after {
  height: 100%;
}

.tl-item {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 24px;
  margin-bottom: 40px;
  opacity: 0;
  transform: translateX(-20px);
  transition: all 0.6s ease-out;
}

.tl-item.visible {
  opacity: 1;
  transform: translateX(0);
}

.tl-item:nth-child(even) {
  transition-delay: 0.1s;
}

.tl-marker {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

.tl-marker span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 28px;
  border-radius: 14px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--ink-dim);
  white-space: nowrap;
}

.tl-marker .future {
  background: linear-gradient(135deg, rgba(108,92,231,0.2), rgba(0,210,255,0.2));
  border-color: rgba(108,92,231,0.3);
  color: var(--accent-2);
}

.tl-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 24px;
  transition: all var(--transition);
}

.tl-card:hover {
  background: var(--bg-card-hover);
  transform: translateX(4px);
}

.tl-card.future-card {
  border-style: dashed;
  border-color: rgba(108,92,231,0.3);
}

.tl-icon {
  font-size: 1.4rem;
  margin-bottom: 8px;
}

.tl-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.tl-card p {
  font-size: 0.9rem;
  color: var(--ink-dim);
  line-height: 1.6;
}

/* ========== TECH GRID ========== */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.tech-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 28px;
  text-align: center;
  overflow: hidden;
  transition: all var(--transition);
  cursor: default;
}

.tech-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.2);
}

.tech-glow {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 50% 0%, hsla(var(--hue, 190), 80%, 60%, 0.06), transparent 60%);
  pointer-events: none;
  transition: opacity 0.4s;
  opacity: 0;
}

.tech-card:hover .tech-glow {
  opacity: 1;
}

.tech-icon {
  font-size: 2.4rem;
  margin-bottom: 16px;
}

.tech-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.tech-card p {
  font-size: 0.88rem;
  color: var(--ink-dim);
  line-height: 1.6;
}

/* ========== PREDICTIONS ========== */
.pred-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  max-width: 1000px;
  margin: 0 auto;
}

.pred-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
  opacity: 0;
  transform: translateY(24px);
}

.pred-card.visible {
  opacity: 1;
  transform: translateY(0);
  transition: all 0.6s ease-out;
  transition-delay: calc(var(--delay, 0) * 0.12s);
}

.pred-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.pred-year {
  display: inline-block;
  padding: 2px 12px;
  background: rgba(108,92,231,0.1);
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-2);
  margin-bottom: 12px;
}

.pred-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.pred-card p {
  font-size: 0.9rem;
  color: var(--ink-dim);
  line-height: 1.6;
  margin-bottom: 16px;
}

.pred-confidence {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 100px;
  display: inline-block;
}

.pred-confidence.high {
  background: rgba(0,230,118,0.12);
  color: var(--green);
}

.pred-confidence.medium {
  background: rgba(255,145,0,0.12);
  color: var(--orange);
}

.pred-confidence.low {
  background: rgba(255,255,255,0.05);
  color: var(--ink-dim);
}

/* ========== FAQ ========== */
.faq-list {
  max-width: 680px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  overflow: hidden;
  transition: background var(--transition);
}

.faq-item:hover {
  background: var(--bg-card);
}

.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  text-align: left;
  gap: 12px;
}

.faq-chevron {
  flex-shrink: 0;
  transition: transform 0.3s;
  color: var(--ink-dim);
}

.faq-item.open .faq-chevron {
  transform: rotate(180deg);
  color: var(--accent-2);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease-out, padding 0.4s ease-out;
}

.faq-item.open .faq-a {
  max-height: 300px;
  padding: 0 20px 20px;
}

.faq-a p {
  font-size: 0.92rem;
  color: var(--ink-dim);
  line-height: 1.7;
}

/* ========== FOOTER ========== */
.footer {
  padding: 60px 0 40px;
  border-top: 1px solid var(--line);
  position: relative;
  z-index: 1;
}

.footer-inner {
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--display);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.footer-brand .logo-icon {
  font-size: 1.3rem;
}

.footer-brand .logo-text span {
  color: var(--accent);
}

.footer-desc {
  color: var(--muted);
  font-size: 0.85rem;
  max-width: 500px;
  margin: 0 auto 32px;
  line-height: 1.6;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-size: 0.82rem;
  color: var(--muted);
}

.footer-bottom .muted {
  color: var(--muted);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }
  .hero-desc {
    margin: 0 auto 32px;
  }
  .hero-cta {
    justify-content: center;
  }
  .hero-stats {
    justify-content: center;
  }
  .hero-visual {
    order: -1;
  }
  .brain-container {
    width: 240px;
    height: 240px;
  }
  .brain-ring-2 {
    width: 200px;
    height: 200px;
  }
  .brain-ring-3 {
    width: 140px;
    height: 140px;
  }
  .tech-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header.scrolled .nav {
    background: rgba(5,5,16,0.96);
  }
  .light .header.scrolled .nav {
    background: rgba(245,243,255,0.96);
  }
  .nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(5,5,16,0.98);
    backdrop-filter: blur(20px);
    padding: 16px;
    gap: 4px;
    transform: translateY(-120%);
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    border-bottom: 1px solid var(--line);
  }
  .light .nav {
    background: rgba(245,243,255,0.98);
  }
  .nav.open {
    transform: translateY(0);
  }
  .burger {
    display: flex;
  }
  .hero {
    padding: 100px 0 40px;
  }
  .hero-stats {
    flex-wrap: wrap;
    gap: 20px;
  }
  .section {
    padding: 60px 0;
  }
  .timeline {
    max-width: 100%;
  }
  .tl-item {
    grid-template-columns: 50px 1fr;
    gap: 16px;
  }
  .tech-grid {
    grid-template-columns: 1fr;
  }
  .pred-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
  .scroll-indicator {
    display: none;
  }
}

/* ========== ANIMATIONS ========== */
@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-20px); }
}