/* ===== Kangotech Ltd — Design System ===== */
:root {
  /* Colors — Deep tech palette */
  --color-bg: #0a0e14;
  --color-bg-elevated: #0f1519;
  --color-bg-card: #141b23;
  --color-surface: #1a2332;
  
  --color-text: #e6eaf0;
  --color-text-muted: #8b9cb5;
  --color-text-subtle: #5c6f87;
  
  --color-accent: #00d4aa;
  --color-accent-dim: rgba(0, 212, 170, 0.15);
  --color-accent-hover: #00f0c0;
  
  --color-border: rgba(139, 156, 181, 0.12);
  --color-border-strong: rgba(139, 156, 181, 0.2);
  
  /* Typography */
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  /* Layout */
  --container-max: 1100px;
  --header-height: 72px;
  
  /* Transitions */
  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --duration: 0.25s;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 100;
  background: rgba(10, 14, 20, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: border-color var(--duration) var(--ease);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: baseline;
  text-decoration: none;
  color: var(--color-text);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.logo-text {
  font-size: 1.25rem;
}

.logo-suffix {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-left: var(--space-xs);
  font-weight: 500;
}

.nav {
  display: flex;
  gap: var(--space-xl);
}

.nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color var(--duration) var(--ease);
}

.nav a:hover {
  color: var(--color-accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-text);
  transition: var(--duration) var(--ease);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse 80% 50% at 50% 20%, var(--color-accent-dim) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(0, 212, 170, 0.06) 0%, transparent 50%);
  pointer-events: none;
}

.hero .container {
  position: relative;
}

.hero-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--space-lg);
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-lg);
  max-width: 20ch;
}

.hero-title .highlight {
  color: var(--color-accent);
}

.hero-desc {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 42ch;
  margin-bottom: var(--space-2xl);
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.875rem 1.75rem;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 8px;
  transition: all var(--duration) var(--ease);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-bg);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

/* ===== Sections ===== */
.section {
  padding: var(--space-3xl) 0;
}

.section-header {
  margin-bottom: var(--space-2xl);
}

.section-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: var(--space-sm);
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 600;
  letter-spacing: -0.02em;
}

/* ===== About ===== */
.about-content p {
  color: var(--color-text-muted);
  max-width: 65ch;
  margin-bottom: var(--space-lg);
}

.about-lead {
  font-size: 1.125rem;
  color: var(--color-text) !important;
}

.company-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-2xl);
}

.info-card {
  padding: var(--space-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
}

.info-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-subtle);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-sm);
}

.info-value {
  font-size: 0.9375rem;
  color: var(--color-text);
  font-family: var(--font-mono);
}

/* ===== Services ===== */
.services {
  background: var(--color-bg-elevated);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.service-card {
  padding: var(--space-xl);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  transition: border-color var(--duration) var(--ease), transform var(--duration) var(--ease);
}

.service-card:hover {
  border-color: var(--color-border-strong);
  transform: translateY(-2px);
}

.service-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-dim);
  border-radius: 12px;
  margin-bottom: var(--space-lg);
  color: var(--color-accent);
}

.service-icon svg {
  width: 24px;
  height: 24px;
}

.service-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--color-text);
}

.service-card p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

.operational-model {
  padding: var(--space-xl);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 16px;
}

.operational-model h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--color-text);
}

.operational-model p {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  max-width: 65ch;
}

/* ===== Contact ===== */
.contact-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
}

.contact-card {
  padding: var(--space-xl);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 16px;
}

.contact-card h4 {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-subtle);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-md);
}

.contact-email {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: none;
  display: block;
  margin-bottom: var(--space-md);
  transition: color var(--duration) var(--ease);
}

.contact-email:hover {
  color: var(--color-accent-hover);
}

.contact-note,
.contact-address {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.contact-links {
  grid-column: 1 / -1;
  margin-top: var(--space-md);
}

.link-policy {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9375rem;
  transition: color var(--duration) var(--ease);
}

.link-policy:hover {
  color: var(--color-accent-hover);
}

/* ===== Footer ===== */
.footer {
  padding: var(--space-3xl) 0 var(--space-xl);
  border-top: 1px solid var(--color-border);
}

.footer-main {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.logo-footer {
  display: inline-flex;
  margin-bottom: var(--space-sm);
}

.footer-tagline {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
}

.footer-nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--duration) var(--ease);
}

.footer-nav a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: var(--color-text-subtle);
  margin-bottom: var(--space-xs);
}

.footer-bottom p:last-child {
  margin-bottom: 0;
}

/* ===== Policy Page ===== */
.policy-page {
  padding-top: calc(var(--header-height) + var(--space-3xl));
  padding-bottom: var(--space-3xl);
  min-height: 100vh;
}

.policy-page .section-title {
  margin-bottom: var(--space-2xl);
}

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

.policy-content h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
}

.policy-content p,
.policy-content li {
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  line-height: 1.7;
}

.policy-content ul,
.policy-content ol {
  padding-left: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.policy-content ol {
  list-style-type: decimal;
}

.policy-content a {
  color: var(--color-accent);
  text-decoration: none;
}

.policy-content a:hover {
  text-decoration: underline;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9375rem;
  margin-bottom: var(--space-2xl);
  transition: color var(--duration) var(--ease);
}

.back-link:hover {
  color: var(--color-accent);
}

/* ===== Mobile ===== */
@media (max-width: 768px) {
  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-xl);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--duration) var(--ease);
  }

  body.nav-open .nav {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-toggle {
    display: flex;
  }

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

  .company-info {
    grid-template-columns: 1fr;
  }

  .services-grid {
    grid-template-columns: 1fr;
  }
}