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

:root {
  --color-bg:       #f8f9fa;
  --color-surface:  #ffffff;
  --color-text:     #1a1a2e;
  --color-muted:    #5a5a7a;
  --color-accent:   #4361ee;
  --color-accent-d: #3a56d4;
  --color-hero-bg:  #0f0f23;
  --color-hero-txt: #e8e8f0;
  --color-border:   #e2e4e9;
  --radius:         10px;
  --shadow:         0 2px 8px rgba(0,0,0,.06);
  --shadow-hover:   0 6px 20px rgba(0,0,0,.10);
  --transition:     .25s ease;
  --max-w:          1120px;
}

html { scroll-behavior: smooth; scroll-padding-top: 70px; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: .35em;
  letter-spacing: -.02em;
}

h3 { font-size: 1.15rem; font-weight: 600; }

.section-sub {
  color: var(--color-muted);
  font-size: 1.05rem;
  margin-bottom: 2rem;
}

section { padding: 80px 0; }

/* ===== Nav ===== */
#nav {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 100;
  background: transparent;
  transition: background var(--transition), box-shadow var(--transition);
}
#nav.scrolled {
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 4px rgba(0,0,0,.08);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-hero-txt);
  text-decoration: none;
  transition: color var(--transition);
}
#nav.scrolled .nav-brand { color: var(--color-text); }

.nav-links {
  display: flex; gap: 28px; list-style: none;
}
.nav-links a {
  text-decoration: none;
  font-size: .9rem;
  font-weight: 500;
  color: rgba(232,232,240,.75);
  transition: color var(--transition);
}
.nav-links a:hover { color: #fff; }
#nav.scrolled .nav-links a { color: var(--color-muted); }
#nav.scrolled .nav-links a:hover { color: var(--color-text); }

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-hero-txt);
  border-radius: 2px;
  transition: background var(--transition);
}
#nav.scrolled .nav-toggle span { background: var(--color-text); }

/* ===== Hero ===== */
#hero {
  background: var(--color-hero-bg);
  background-image:
    radial-gradient(ellipse at 20% 50%, rgba(67,97,238,.15) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(67,97,238,.10) 0%, transparent 50%);
  color: var(--color-hero-txt);
  min-height: 520px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
}

.hero-content { max-width: 720px; }

.badge {
  display: inline-block;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: rgba(67,97,238,.12);
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 20px;
}

#hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -.03em;
  line-height: 1.15;
  margin-bottom: 18px;
}

.hero-sub {
  font-size: 1.15rem;
  color: rgba(232,232,240,.7);
  max-width: 580px;
  margin: 0 auto 32px;
  line-height: 1.65;
}

.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-block;
  font-size: .92rem;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: 8px;
  text-decoration: none;
  transition: background var(--transition), transform .15s;
  cursor: pointer;
}
.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}
.btn-primary:hover { background: var(--color-accent-d); }

.btn-outline {
  background: transparent;
  color: var(--color-hero-txt);
  border: 1.5px solid rgba(232,232,240,.3);
}
.btn-outline:hover {
  background: rgba(255,255,255,.08);
  border-color: rgba(232,232,240,.5);
}

/* ===== About ===== */
#about { background: var(--color-surface); }

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.about-card {
  position: relative;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  overflow: hidden;
  transition: box-shadow var(--transition), transform .15s;
}
.about-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.about-accent {
  position: absolute;
  top: 0; left: 0;
  width: 4px;
  height: 100%;
  border-radius: var(--radius) 0 0 var(--radius);
}
.about-card:nth-child(1) .about-accent { background: #ef4444; }
.about-card:nth-child(2) .about-accent { background: var(--color-accent); }
.about-card:nth-child(3) .about-accent { background: #10b981; }

.about-card h3 { margin-bottom: 8px; }
.about-card p { color: var(--color-muted); font-size: .95rem; }

/* ===== Features ===== */
#features { background: var(--color-bg); }

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.feature-card {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  overflow: hidden;
  transition: box-shadow var(--transition), transform .15s;
}
.feature-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.feature-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-accent);
  opacity: .18;
  margin-bottom: 8px;
  line-height: 1;
}

.feature-card h3 { margin-bottom: 8px; color: var(--color-text); }
.feature-card p { color: var(--color-muted); font-size: .93rem; }

.feature-card:hover .feature-num { opacity: .4; }

.feature-card::after {
  content: '';
  position: absolute;
  bottom: 0; left: 20px; right: 20px;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px;
  transform: scaleX(0);
  transition: transform var(--transition);
}
.feature-card:hover::after { transform: scaleX(1); }

/* ===== Team ===== */
#team {
  background: var(--color-surface);
  background-image: radial-gradient(ellipse at 50% 100%, rgba(67,97,238,.04) 0%, transparent 60%);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.team-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: box-shadow var(--transition), transform .15s;
}
.team-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.team-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--color-border);
  margin: 0 auto 14px;
  display: block;
}

.team-card h3 { font-size: 1.05rem; margin-bottom: 4px; }

.team-role {
  display: inline-block;
  font-size: .8rem;
  font-weight: 600;
  color: var(--color-accent);
  background: rgba(67,97,238,.08);
  padding: 3px 10px;
  border-radius: 12px;
}

/* ===== Documentation ===== */
#docs { background: var(--color-bg); }

.doc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.doc-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius);
  padding: 20px 20px 20px 22px;
  text-decoration: none;
  color: var(--color-text);
  transition: box-shadow var(--transition), transform .15s, border-color var(--transition);
}
.doc-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
  border-color: var(--color-accent);
}

.doc-card strong { font-size: .95rem; }
.doc-card span { color: var(--color-muted); font-size: .83rem; line-height: 1.4; }

.doc-card-multi {
  cursor: default;
}
.doc-card-multi:hover {
  transform: none;
  box-shadow: var(--shadow);
}

.doc-links {
  display: flex;
  gap: 10px;
  margin-top: 8px;
  flex-wrap: wrap;
}
.doc-links a {
  font-size: .85rem;
  font-weight: 500;
  color: var(--color-accent);
  text-decoration: none;
  padding: 4px 12px;
  border-radius: 6px;
  background: rgba(67,97,238,.07);
  transition: background var(--transition);
}
.doc-links a:hover {
  background: rgba(67,97,238,.15);
}

/* ===== Footer ===== */
footer {
  background: var(--color-hero-bg);
  color: rgba(232,232,240,.6);
  padding: 40px 0;
  font-size: .88rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 24px;
}

footer strong {
  color: var(--color-hero-txt);
  font-size: 1rem;
  display: block;
  margin-bottom: 6px;
}

footer p { margin-top: 2px; }

.footer-right { text-align: right; }

.footer-tech {
  margin-top: 8px;
  font-size: .8rem;
  color: rgba(232,232,240,.35);
  letter-spacing: .03em;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  section { padding: 56px 0; }
  h2 { font-size: 1.6rem; }

  .nav-toggle { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: 60px; left: 0; right: 0;
    flex-direction: column;
    background: var(--color-hero-bg);
    padding: 16px 24px;
    gap: 12px;
  }
  #nav.scrolled .nav-links { background: var(--color-surface); }
  #nav.open .nav-links { display: flex; }

  #hero { min-height: 420px; padding: 100px 20px 60px; }
  #hero h1 { font-size: 1.8rem; }
  .hero-sub { font-size: 1rem; }

  .features-grid { grid-template-columns: 1fr; }
  .team-grid { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
  .doc-grid { grid-template-columns: 1fr; }

  .footer-inner { flex-direction: column; }
  .footer-right { text-align: left; }
}

@media (max-width: 480px) {
  .about-grid { grid-template-columns: 1fr; }
  .team-grid { grid-template-columns: 1fr; }
}