/* ==========================================================================
   VPN Developer Portal — Yatta Design System
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --font-sans: 'Manrope', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --color-brand: #1769ff;
  --color-brand-strong: #0b4ed8;
  --color-brand-light: #e8f0ff;
  --color-accent: #18a999;
  --color-warm: #ffb547;

  --color-bg: #ffffff;
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;

  --surface-border: rgba(15, 23, 42, 0.08);
  --surface-border-hover: rgba(23, 105, 255, 0.22);
  --surface-shadow: 0 1px 3px rgba(15, 23, 42, 0.06), 0 8px 24px -8px rgba(15, 23, 42, 0.08);
  --surface-shadow-hover: 0 20px 50px -20px rgba(15, 23, 42, 0.18);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  color: var(--color-text);
  background:
    radial-gradient(circle at 20% 5%, rgba(23, 105, 255, 0.04), transparent 600px),
    radial-gradient(circle at 80% 10%, rgba(24, 169, 153, 0.03), transparent 500px),
    linear-gradient(180deg, #f8fbff 0%, #ffffff 600px);
  margin: 0;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-brand);
  text-decoration: none;
  transition: color 0.2s ease;
}
a:hover { color: var(--color-brand-strong); }

*:focus-visible {
  outline: 2px solid var(--color-brand);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  background: rgba(23, 105, 255, 0.06);
  padding: 2px 7px;
  border-radius: 5px;
  color: var(--color-brand-strong);
}

/* ==========================================================================
   Header
   ========================================================================== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px) saturate(1.8);
  -webkit-backdrop-filter: blur(16px) saturate(1.8);
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid var(--surface-border);
  padding: 14px 24px;
}

.header__inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 14px;
}

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

.header__title {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  padding: 80px 24px 64px;
  text-align: center;
  position: relative;
}

.hero__inner {
  max-width: 680px;
  margin: 0 auto;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 100px;
  background: var(--color-brand-light);
  color: var(--color-brand);
  font-size: 0.8125rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.hero__heading {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.08;
  margin: 0 0 16px;
  color: var(--color-text);
}

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

.hero__subheading {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.6;
}

/* ==========================================================================
   Section Header with Icon
   ========================================================================== */
.section-header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 32px;
}

.section-header__icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.section-header__icon svg {
  border-radius: var(--radius-md);
}

.section-header .section__title {
  margin-bottom: 4px;
}

.section-header .section__subtitle {
  margin-bottom: 0;
}

/* ==========================================================================
   Onboarding Steps
   ========================================================================== */
.onboarding-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 32px;
}

.step {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 18px;
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--surface-shadow);
}

.step__number {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-brand), var(--color-brand-strong));
  color: #fff;
  font-size: 0.8125rem;
  font-weight: 700;
}

.step__content {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.step__content strong {
  font-size: 0.875rem;
  color: var(--color-text);
}

.step__content span {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

.step__code {
  font-family: var(--font-mono);
  font-size: 0.875rem !important;
  font-weight: 600;
  color: var(--color-brand) !important;
  background: var(--color-brand-light);
  padding: 2px 10px;
  border-radius: 6px;
  display: inline-block;
  margin-top: 2px;
}

/* ==========================================================================
   Content
   ========================================================================== */
.content {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.section {
  margin-bottom: 64px;
}

.section__title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin: 0 0 8px;
}

.section__subtitle {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin: 0 0 24px;
  line-height: 1.6;
}

/* ==========================================================================
   Cards
   ========================================================================== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.card {
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--surface-shadow);
  transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.28s cubic-bezier(0.4, 0, 0.2, 1),
              border-color 0.28s ease;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--surface-shadow-hover);
  border-color: var(--surface-border-hover);
}

.card__title {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 6px;
  color: var(--color-text);
}

.card__domain {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-brand);
  margin: 0 0 8px;
  word-break: break-all;
  display: block;
  text-decoration: none;
  transition: color 0.15s ease;
}

a.card__domain:hover {
  color: var(--color-brand-strong);
  text-decoration: underline;
}

.card__domain--internal {
  color: var(--color-text-secondary);
}

.card__internal {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin: 0 0 10px;
  word-break: break-all;
}

.card__description {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin: 0 0 12px;
  line-height: 1.5;
}

.card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.card__badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  background: rgba(23, 105, 255, 0.06);
  color: var(--color-brand-strong);
  border: 1px solid rgba(23, 105, 255, 0.1);
}

/* ==========================================================================
   Categories
   ========================================================================== */
.category {
  margin-bottom: 40px;
}

.category__title {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin: 0 0 16px;
  padding-left: 2px;
}

/* ==========================================================================
   Download Grid
   ========================================================================== */
.download-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}

.download-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 32px 16px 24px;
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--surface-shadow);
  text-decoration: none;
  color: var(--color-text);
  transition: transform 0.32s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.32s cubic-bezier(0.4, 0, 0.2, 1),
              border-color 0.32s ease;
}

.download-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 44px -18px rgba(23, 105, 255, 0.25);
  border-color: var(--surface-border-hover);
  text-decoration: none;
  color: var(--color-text);
}

.download-card__icon {
  color: var(--color-text);
  opacity: 0.85;
  transition: opacity 0.2s, transform 0.3s ease;
}

.download-card:hover .download-card__icon {
  opacity: 1;
  transform: scale(1.1);
}

.download-card__label {
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.download-card__store {
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* ==========================================================================
   Code Blocks
   ========================================================================== */
.code-block {
  background: #0f172a;
  color: #e2e8f0;
  border-radius: var(--radius-md);
  padding: 18px 22px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.7;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
  margin-top: 12px;
}

.code-block code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

/* ==========================================================================
   Info Boxes
   ========================================================================== */
.info-box {
  padding: 16px 20px;
  border-radius: var(--radius-md);
  margin: 16px 0;
  font-size: 0.875rem;
  line-height: 1.6;
}

.info-box--warning {
  background: rgba(255, 181, 71, 0.08);
  border: 1px solid rgba(255, 181, 71, 0.25);
  color: #92400e;
}

.info-box--tip {
  background: rgba(23, 105, 255, 0.04);
  border: 1px solid rgba(23, 105, 255, 0.12);
  color: var(--color-brand-strong);
}

/* ==========================================================================
   Network Diagram
   ========================================================================== */
.network-diagram {
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: var(--surface-shadow);
  overflow-x: auto;
}

.network-diagram svg {
  display: block;
  margin: 0 auto;
  max-width: 100%;
  height: auto;
}

/* ==========================================================================
   Flow Cards (traffic path explanations)
   ========================================================================== */
.flow-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 14px;
  margin-top: 20px;
}

.flow-card {
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--surface-shadow);
}

.flow-card__header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-size: 0.875rem;
}

.flow-card__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.flow-card__steps {
  margin: 0;
  padding-left: 20px;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.flow-card__steps code {
  font-size: 0.75rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  text-align: center;
  padding: 40px 24px;
  border-top: 1px solid var(--surface-border);
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 768px) {
  .hero { padding: 56px 20px 40px; }
  .hero__heading { font-size: 1.75rem; }
  .content { padding: 0 20px 56px; }
  .section { margin-bottom: 48px; }
  .card-grid { grid-template-columns: 1fr; }
  .download-grid { grid-template-columns: repeat(3, 1fr); }
  .network-diagram { padding: 20px; }
  .onboarding-steps { grid-template-columns: repeat(2, 1fr); }
  .section-header { flex-direction: column; gap: 12px; }
}

@media (max-width: 480px) {
  .hero { padding: 40px 16px 32px; }
  .hero__heading { font-size: 1.5rem; }
  .content { padding: 0 16px 40px; }
  .download-grid { grid-template-columns: repeat(2, 1fr); }
  .onboarding-steps { grid-template-columns: 1fr; }
  .card { padding: 18px; }
  .code-block { padding: 14px 16px; font-size: 0.75rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}