/* === 3cors Style Guide === */
:root {
  --bg: #07090F;
  --bg-alt: #0c0f18;
  --surface: rgba(30, 41, 59, 0.5);
  --border: rgba(59, 130, 246, 0.15);
  --border-hover: rgba(59, 130, 246, 0.4);
  --blue: #3B82F6;
  --blue-light: #60A5FA;
  --blue-ai: #0EA5E9;
  --text: #FAFAFA;
  --text-secondary: #CCCCCC;
  --text-muted: #8892a4;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', monospace;
  --radius: 12px;
  --glow: 0 0 40px rgba(59, 130, 246, 0.12);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* === Navigation === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  transition: all 0.3s ease;
  background: transparent;
}

.nav.scrolled {
  background: rgba(7, 9, 15, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.2rem;
}

.nav-logo img {
  border-radius: 6px;
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--blue-light);
}

/* Language toggle */
.lang-toggle {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-hover);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 0.8rem;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.5px;
}

.lang-toggle:hover {
  color: var(--blue-light);
  border-color: var(--blue);
  background: rgba(59, 130, 246, 0.06);
}

.nav-right-mobile {
  display: none;
  align-items: center;
  gap: 8px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  transition: all 0.3s;
}

.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* === Hero === */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}

.grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(59, 130, 246, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 0 24px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 18px;
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--blue-light);
  letter-spacing: 0.5px;
  margin-bottom: 32px;
  background: rgba(59, 130, 246, 0.06);
}

.hero h1 {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--text) 0%, var(--blue-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* === Buttons === */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.25s ease;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--blue);
  color: #fff;
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
  background: #2563EB;
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.45);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border-hover);
}

.btn-outline:hover {
  border-color: var(--blue);
  color: var(--blue-light);
  background: rgba(59, 130, 246, 0.06);
}

/* === Sections === */
.section {
  padding: 100px 0;
}

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

.section-title {
  font-size: 2.4rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.section-sub {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto 56px;
}

/* === Three Cores Cards === */
.cores-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: all 0.3s ease;
  backdrop-filter: blur(8px);
}

.card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--glow);
  transform: translateY(-4px);
}

.card-icon {
  width: 44px;
  height: 44px;
  color: var(--blue);
  margin-bottom: 20px;
}

.card-icon svg {
  width: 100%;
  height: 100%;
}

.card h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* === Features Grid === */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature {
  padding: 28px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(7, 9, 15, 0.6);
  transition: border-color 0.3s;
}

.feature:hover {
  border-color: var(--border-hover);
}

.feature-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--blue);
  margin-bottom: 12px;
}

.feature p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
}

.feature p.mono {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* === Principles === */
.principles-list {
  max-width: 700px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.principle {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

.principle-num {
  font-family: var(--mono);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--blue);
  flex-shrink: 0;
  padding-top: 2px;
}

.principle h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.principle p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* === Contact === */
.contact-section {
  text-align: center;
}

.contact-section .btn {
  margin-top: 8px;
}

/* === Footer === */
.footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-left img {
  border-radius: 4px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--blue-light);
}

/* === Legal Pages === */
.legal {
  padding: 120px 0 80px;
}

.legal h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 32px;
}

.legal h2 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-top: 32px;
  margin-bottom: 12px;
}

.legal p, .legal li {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 12px;
}

.legal ul {
  padding-left: 20px;
  margin-bottom: 12px;
}

.legal a {
  color: var(--blue-light);
  text-decoration: none;
}

.legal a:hover {
  text-decoration: underline;
}

/* === Responsive === */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(7, 9, 15, 0.97);
    backdrop-filter: blur(16px);
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border);
  }

  .nav-links .lang-toggle {
    display: none;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-right-mobile {
    display: flex;
  }

  .cores-grid,
  .features-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 64px 0;
  }

  .footer-inner {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-badge {
    font-size: 0.7rem;
  }

  .hero-sub {
    font-size: 1rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
}

/* === Solutions === */
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.solution-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: all 0.3s ease;
  backdrop-filter: blur(8px);
}

.solution-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--glow);
}

.solution-card:last-child:nth-child(odd) {
  grid-column: 1 / -1;
  max-width: calc(50% - 12px);
  justify-self: center;
}

.solution-num {
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--blue);
  margin-bottom: 12px;
}

.solution-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.solution-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.65;
}

.solution-benefit {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.solution-benefit strong {
  color: var(--blue-light);
  font-weight: 600;
}

.solutions-cta {
  text-align: center;
  margin-top: 48px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.solutions-cta a {
  color: var(--blue-light);
  text-decoration: none;
}

.solutions-cta a:hover {
  text-decoration: underline;
}

@media (max-width: 768px) {
  .solutions-grid {
    grid-template-columns: 1fr;
  }

  .solution-card:last-child:nth-child(odd) {
    max-width: 100%;
  }
}