/* =====================================================
   NetTools CLI — Stylesheet
   Design system: CSS variables, 8px spacing scale,
   16px radius, thin borders, subtle shadows.
   ===================================================== */

/* ---------- Design Tokens ---------- */
:root {
  /* Brand */
  --color-accent: #00C8FF;
  --color-accent-hover: #33D6FF;
  --color-accent-pressed: #009FD1;

  /* Surfaces */
  --color-bg: #0A0F1A;
  --color-surface: #111827;
  --color-surface-raised: #141B2A;
  --color-border: #1E293B;

  /* Text */
  --color-text-primary: #F8FAFC;
  --color-text-secondary: #94A3B8;
  --color-text-muted: #64748B;

  /* Status */
  --color-success: #22C55E;
  --color-warning: #F59E0B;
  --color-error: #EF4444;

  /* Typography */
  --font-heading: 'Geist', 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;

  /* Spacing (8px system) */
  --space-1: 0.5rem;   /* 8px */
  --space-2: 1rem;     /* 16px */
  --space-3: 1.5rem;   /* 24px */
  --space-4: 2rem;     /* 32px */
  --space-5: 2.5rem;   /* 40px */
  --space-6: 3rem;     /* 48px */
  --space-8: 4rem;     /* 64px */
  --space-10: 5rem;    /* 80px */
  --space-12: 6rem;    /* 96px */

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.24);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.32);
  --shadow-glow: 0 0 0 1px rgba(0, 200, 255, 0.16), 0 8px 32px rgba(0, 200, 255, 0.08);

  /* Layout */
  --container-width: 1440px;
  --container-padding: 2.5rem;

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 150ms;
  --duration-base: 250ms;
  --duration-slow: 500ms;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;

  /* Subtle radial gradients, no imagery */
  background-image:
    radial-gradient(circle at 15% 0%, rgba(0, 200, 255, 0.06), transparent 45%),
    radial-gradient(circle at 85% 20%, rgba(0, 200, 255, 0.04), transparent 40%);
  background-repeat: no-repeat;
}

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

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

ul, ol {
  list-style: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

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

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

/* ---------- Reveal-on-scroll animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal--delay-1 { transition-delay: 100ms; }
.reveal--delay-2 { transition-delay: 200ms; }

/* =====================================================
   Buttons
   ===================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0.625rem 1.125rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  white-space: nowrap;
  transition: background-color var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out),
              transform var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}

.btn i {
  width: 16px;
  height: 16px;
}

.btn--primary {
  background-color: var(--color-accent);
  color: #041016;
}

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

.btn--primary:active {
  background-color: var(--color-accent-pressed);
  transform: translateY(0);
}

.btn--secondary {
  background-color: var(--color-surface);
  border-color: var(--color-border);
  color: var(--color-text-primary);
}

.btn--secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn--ghost {
  background-color: transparent;
  border-color: var(--color-border);
  color: var(--color-text-secondary);
}

.btn--ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-text-primary);
}

.btn--lg {
  padding: 0.8125rem 1.375rem;
  font-size: 1rem;
}

.btn--icon {
  padding: 0.5rem;
  width: 40px;
  height: 40px;
  justify-content: center;
}

.btn--icon i {
  width: 18px;
  height: 18px;
}

/* =====================================================
   Navbar
   ===================================================== */
.navbar {
  position: sticky;
  top: var(--space-3);
  z-index: 100;
  padding-inline: var(--container-padding);
}

.navbar__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-width);
  height: 68px;
  margin-inline: auto;
  padding-inline: var(--space-4);
  background-color: rgba(17, 24, 39, 0.72);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md), 0 1px 0 0 rgba(255, 255, 255, 0.02) inset;
}

.navbar__brand {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.navbar__brand:hover {
  opacity: 0.85;
}

.navbar__logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: linear-gradient(160deg, rgba(0, 200, 255, 0.14), rgba(0, 200, 255, 0.02));
  color: var(--color-accent);
  box-shadow: inset 0 0 0 1px rgba(0, 200, 255, 0.06);
}

.navbar__logo svg {
  width: 17px;
  height: 17px;
}

.navbar__brand-text {
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.navbar__brand-text strong {
  font-weight: 700;
}

.navbar__links {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.navbar__links a {
  position: relative;
  display: inline-flex;
  padding-block: 0.35rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-out);
}

.navbar__links a::after {
  /* Animated underline on hover, instead of an abrupt color swap */
  content: '';
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 1px;
  background-color: var(--color-accent);
  transition: right var(--duration-base) var(--ease-out);
}

.navbar__links a:hover {
  color: var(--color-text-primary);
}

.navbar__links a:hover::after {
  right: 0;
}

.navbar__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.navbar__actions::before {
  /* Thin divider separating the GitHub link from the primary CTA */
  content: '';
  width: 1px;
  height: 22px;
  background-color: var(--color-border);
}

.navbar__menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--duration-fast) var(--ease-out);
}

.navbar__menu-toggle:hover {
  border-color: var(--color-accent);
}

.mobile-menu {
  display: none;
  flex-direction: column;
  gap: var(--space-2);
  max-width: var(--container-width);
  margin: var(--space-2) auto 0;
  padding: var(--space-3) var(--space-4) var(--space-4);
  background-color: rgba(17, 24, 39, 0.92);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.mobile-menu.is-open {
  display: flex;
}

.mobile-menu a {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}

/* =====================================================
   Hero
   ===================================================== */
.hero {
  padding-block: var(--space-10) var(--space-12);
}

.hero__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.875rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-accent);
  background-color: rgba(0, 200, 255, 0.08);
  border: 1px solid rgba(0, 200, 255, 0.24);
  border-radius: 999px;
  margin-bottom: var(--space-3);
}

.badge i {
  width: 14px;
  height: 14px;
}

.hero__heading {
  font-size: clamp(2.25rem, 3.2vw + 1rem, 3.5rem);
  margin-bottom: var(--space-3);
}

.cursor-inline {
  display: inline-block;
  width: 0.5ch;
  height: 0.85em;
  background-color: var(--color-accent);
  margin-left: 4px;
  vertical-align: -0.1em;
  animation: blink 1.1s step-end infinite;
}

.hero__description {
  max-width: 46ch;
  color: var(--color-text-secondary);
  font-size: 1.0625rem;
  margin-bottom: var(--space-4);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.hero__tags li {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.hero__tags i {
  width: 14px;
  height: 14px;
  color: var(--color-text-muted);
}

/* ---------- Terminal ---------- */
.terminal {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.terminal__titlebar {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0.75rem var(--space-2);
  background-color: var(--color-surface-raised);
  border-bottom: 1px solid var(--color-border);
}

.terminal__dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}

.terminal__dot--red { background-color: #FF5F57; }
.terminal__dot--yellow { background-color: #FEBC2E; }
.terminal__dot--green { background-color: #28C840; }

.terminal__title {
  margin-left: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.terminal__body {
  padding: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  min-height: 340px;
}

.terminal__line {
  padding-block: 0.2rem;
  white-space: pre-wrap;
  word-break: break-word;
}

.terminal__line--out {
  color: var(--color-text-secondary);
}

.terminal__prompt {
  color: var(--color-accent);
  margin-right: 0.5ch;
  font-weight: 600;
}

.terminal__command {
  color: var(--color-accent);
  font-weight: 500;
}

.ok {
  color: var(--color-success);
  font-weight: 600;
  margin-right: 0.35ch;
}

.terminal__cursor {
  display: inline-block;
  width: 8px;
  height: 1.1em;
  background-color: var(--color-accent);
  vertical-align: -0.15em;
  animation: blink 1.1s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* =====================================================
   Section heading (shared)
   ===================================================== */
.section-heading {
  text-align: center;
  max-width: 640px;
  margin-inline: auto;
  margin-bottom: var(--space-8);
}

.eyebrow {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-1);
}

.section-heading h2 {
  font-size: clamp(1.75rem, 1.5vw + 1rem, 2.25rem);
  margin-bottom: var(--space-2);
}

.section-heading p {
  color: var(--color-text-secondary);
  font-size: 1.0625rem;
}

/* =====================================================
   Features
   ===================================================== */
.features {
  padding-block: var(--space-12);
  border-top: 1px solid var(--color-border);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

.feature-card {
  padding: var(--space-3);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--duration-base) var(--ease-out),
              transform var(--duration-base) var(--ease-out);
}

.feature-card:hover {
  border-color: rgba(0, 200, 255, 0.35);
  transform: translateY(-4px);
}

.feature-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-bottom: var(--space-2);
  color: var(--color-accent);
  background-color: rgba(0, 200, 255, 0.08);
  border-radius: var(--radius-sm);
}

.feature-card__icon i {
  width: 20px;
  height: 20px;
}

.feature-card h3 {
  font-size: 1.0625rem;
  margin-bottom: var(--space-1);
}

.feature-card p {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}

/* =====================================================
   Workflow
   ===================================================== */
.workflow {
  padding-block: var(--space-12);
  border-top: 1px solid var(--color-border);
}

.workflow__steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.workflow__step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  width: 140px;
}

.workflow__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  margin-bottom: var(--space-2);
  color: var(--color-accent);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.workflow__icon i {
  width: 24px;
  height: 24px;
}

.workflow__label {
  font-weight: 600;
  font-size: 0.9375rem;
  margin-bottom: 0.2rem;
}

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

.workflow__arrow {
  display: flex;
  align-items: center;
  height: 56px;
  color: var(--color-text-muted);
}

.workflow__arrow i {
  width: 18px;
  height: 18px;
}

/* =====================================================
   Commands + Install
   ===================================================== */
.commands {
  padding-block: var(--space-12);
  border-top: 1px solid var(--color-border);
}

.commands__grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-8);
}

.commands__block h2 {
  font-size: 1.5rem;
  margin-bottom: var(--space-1);
}

.commands__intro {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-3);
}

.code-block {
  position: relative;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  overflow-x: auto;
}

.code-block--install {
  border-color: rgba(0, 200, 255, 0.28);
  background-color: rgba(0, 200, 255, 0.04);
}

.code-block__lines p {
  padding-block: 0.2rem;
  white-space: pre;
}

.prompt {
  color: var(--color-accent);
  margin-right: 0.5ch;
}

.cmd {
  color: var(--color-text-primary);
  font-weight: 500;
}

.comment {
  color: var(--color-text-muted);
  margin-left: var(--space-2);
}

.copy-btn {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out);
}

.copy-btn:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.copy-btn i {
  width: 15px;
  height: 15px;
}

.copy-btn.is-copied {
  color: var(--color-success);
  border-color: var(--color-success);
}

.commands__platforms {
  margin-top: var(--space-3);
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

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

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

/* =====================================================
   Footer
   ===================================================== */
.footer {
  padding-block: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex-wrap: wrap;
}

.footer__tagline {
  width: 100%;
  color: var(--color-text-muted);
  font-size: 0.8125rem;
  margin-top: 0.2rem;
}

.footer__legal {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* =====================================================
   Responsive
   ===================================================== */
@media (max-width: 1080px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 960px) {
  .navbar__links {
    display: none;
  }

  .navbar__menu-toggle {
    display: inline-flex;
  }

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

  .hero__terminal {
    order: -1;
  }
}

@media (max-width: 720px) {
  :root {
    --container-padding: 1.25rem;
  }

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

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

  .workflow__arrow {
    transform: rotate(90deg);
    height: 24px;
  }

  .hero__actions .btn {
    flex: 1 1 100%;
    justify-content: center;
  }

  .navbar__actions .btn--primary span {
    display: none;
  }

  .footer__inner {
    flex-direction: column;
    align-items: flex-start;
  }
}