:root {
  --bg: #071018;
  --bg-elevated: rgba(10, 18, 27, 0.78);
  --bg-soft: #0f1b29;
  --panel: rgba(14, 23, 33, 0.9);
  --panel-strong: #101d2b;
  --panel-alt: #0b1723;
  --line: rgba(148, 163, 184, 0.18);
  --line-strong: rgba(148, 163, 184, 0.28);
  --text: #e7edf6;
  --muted: #9aa9ba;
  --muted-strong: #b9c7d8;
  --cyan: #5eead4;
  --cyan-strong: #7dd3fc;
  --teal: #14b8a6;
  --amber: #f9b44d;
  --amber-strong: #f59e0b;
  --red: #ef6b6b;
  --shadow: rgba(15, 23, 42, 0.38);
  --max-width: 1180px;
  --radius: 22px;
  --radius-sm: 14px;
  --container-pad: clamp(1rem, 2vw, 1.5rem);
  --bg-gradient:
    radial-gradient(circle at top left, rgba(78, 207, 179, 0.12), transparent 31%),
    radial-gradient(circle at top right, rgba(59, 130, 246, 0.14), transparent 32%),
    linear-gradient(180deg, #051018 0%, #091821 18%, #060d16 100%);
  --header-bg: rgba(5, 16, 24, 0.72);
}

:root[data-theme="light"] {
  --bg: #f5f7fb;
  --bg-elevated: rgba(255, 255, 255, 0.88);
  --bg-soft: #edf3f9;
  --panel: rgba(255, 255, 255, 0.98);
  --panel-strong: #ebf2ff;
  --panel-alt: #f4f7fb;
  --line: rgba(15, 23, 42, 0.12);
  --line-strong: rgba(15, 23, 42, 0.2);
  --text: #0d1726;
  --muted: #59677a;
  --muted-strong: #344152;
  --cyan: #0c7f78;
  --cyan-strong: #0c6ec8;
  --teal: #0f766e;
  --amber: #c87c10;
  --amber-strong: #b66a00;
  --red: #b8544d;
  --shadow: rgba(15, 23, 42, 0.08);
  --bg-gradient:
    radial-gradient(circle at top left, rgba(14, 165, 233, 0.08), transparent 30%),
    radial-gradient(circle at top right, rgba(16, 185, 129, 0.1), transparent 28%),
    linear-gradient(180deg, #f8fafc 0%, #eef4fa 20%, #f3f6fb 100%);
  --header-bg: rgba(255, 255, 255, 0.75);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", sans-serif;
  background: var(--bg-gradient);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

button, input, textarea { font: inherit; }

.container {
  width: min(var(--max-width), calc(100% - 2rem));
  margin: 0 auto;
}

.text-mono {
  font-family: "JetBrains Mono", "SFMono-Regular", Menlo, monospace;
  letter-spacing: 0.02em;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(18px);
  background: var(--header-bg);
  border-bottom: 1px solid var(--line);
}

.nav {
  height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.2rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.15rem;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.06em;
  color: var(--text);
}

.brand-mark {
  color: var(--cyan);
}

.brand-cursor {
  width: 8px;
  height: 18px;
  border-radius: 4px;
  background: var(--amber);
  display: inline-block;
  margin-left: 0.2rem;
  animation: blink 1s steps(1) infinite;
}

@keyframes blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.82rem;
  color: var(--muted);
}

.nav-links a {
  transition: color 0.2s ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--text);
}

.nav-cta {
  margin-left: 0.5rem;
}

.nav-toggle,
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line-strong);
  background: rgba(255,255,255,0.02);
  color: var(--text);
  border-radius: 12px;
  padding: 0.65rem 0.9rem;
  cursor: pointer;
}

.nav-toggle {
  display: none;
}

.theme-toggle {
  font-size: 0.75rem;
  min-width: 98px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.3rem;
  border-radius: 12px;
  border: 1px solid transparent;
  font-weight: 600;
  transition: transform 0.3s ease, border-color 0.3s ease, background 0.3s ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.button-primary {
  background: linear-gradient(135deg, var(--amber) 0%, #f7c86a 100%);
  color: #111827;
  box-shadow: 0 10px 25px rgba(245, 158, 11, 0.25);
}

.button-secondary {
  background: rgba(148,163,184,0.08);
  border-color: var(--line-strong);
  color: var(--text);
}

.hero {
  padding: clamp(4rem, 7vw, 7rem) 0 3rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  gap: clamp(2rem, 4vw, 4rem);
  align-items: center;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 1rem;
  color: var(--cyan);
  font-size: 0.78rem;
  padding: 0.38rem 0.7rem;
  border: 1px solid rgba(94,234,212,0.18);
  border-radius: 999px;
  background: rgba(20,184,166,0.08);
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.7rem, 5vw, 5rem);
  line-height: 0.98;
  letter-spacing: -0.065em;
  max-width: 620px;
}

.hero p {
  margin: 1.35rem 0 0;
  color: var(--muted);
  font-size: 1.08rem;
  max-width: 600px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 2rem;
}

.hero-metrics {
  list-style: none;
  padding: 0;
  margin: 2rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.hero-metrics li {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 130px;
}

.hero-metrics strong {
  font-size: 1.4rem;
  letter-spacing: -0.04em;
}

.hero-metrics span {
  color: var(--muted);
  font-size: 0.82rem;
}

.panel {
  position: relative;
  background: linear-gradient(180deg, rgba(15, 25, 35, 0.96), rgba(10, 17, 27, 0.96));
  border: 1px solid var(--line-strong);
  border-radius: 24px;
  box-shadow: 0 30px 60px rgba(2, 6, 23, 0.45);
  overflow: hidden;
}

.panel-header {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 1rem 1.1rem;
  border-bottom: 1px solid var(--line);
  background: rgba(148,163,184,0.03);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: block;
}

.dot.red { background: var(--red); }
.dot.yellow { background: var(--amber); }
.dot.green { background: var(--teal); }

.panel-title {
  margin-left: 0.35rem;
  color: var(--muted);
  font-size: 0.78rem;
}

.terminal {
  min-height: 300px;
  padding: 1.4rem 1.2rem 1.8rem;
  font-family: "JetBrains Mono", SFMono-Regular, Menlo, monospace;
  font-size: 0.82rem;
  color: var(--text);
  background: radial-gradient(circle at top left, rgba(59, 130, 246, 0.08), transparent 50%);
}

.terminal-line {
  display: block;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.9;
  min-height: 1.8em;
}

.terminal-prompt { color: var(--cyan); }
.terminal-ok { color: var(--amber); }
.terminal-out { color: var(--muted-strong); }
.terminal-caret {
  display: inline-block;
  width: 8px;
  height: 1.05em;
  vertical-align: -0.18em;
  background: var(--text);
  margin-left: 0.1rem;
  animation: blink 1s steps(1) infinite;
}

.section {
  padding: 4rem 0;
}

.section-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
}

.section-kicker {
  display: inline-block;
  font-size: 0.76rem;
  margin-bottom: 0.5rem;
  color: var(--cyan);
  text-transform: lowercase;
  font-family: "JetBrains Mono", monospace;
}

.section h2 {
  margin: 0;
  font-size: clamp(2rem, 3vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.055em;
}

.section-subtitle {
  margin: 0.7rem 0 0;
  color: var(--muted);
  max-width: 620px;
}

.link-arrow {
  font-family: "JetBrains Mono", monospace;
  color: var(--muted);
  font-size: 0.82rem;
  border-bottom: 1px solid rgba(148,163,184,0.35);
  transition: color 0.2s ease;
}

.link-arrow:hover,
.link-arrow:focus-visible {
  color: var(--text);
}

.trust-bar {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2.4rem;
}

.trust-pill {
  padding: 1.15rem 1rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(148,163,184,0.02);
  text-align: center;
}

.trust-pill strong {
  display: block;
  font-size: clamp(1.2rem, 2vw, 2rem);
  letter-spacing: -0.06em;
}

.trust-pill span {
  font-size: 0.8rem;
  color: var(--muted);
}

.topic-grid,
.tool-grid,
.guide-grid {
  display: grid;
  gap: 1rem;
}

.topic-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.topic-card,
.tool-card,
.guide-card,
.process-card {
  border: 1px solid var(--line);
  background: rgba(148,163,184,0.02);
  border-radius: 20px;
  overflow: hidden;
}

.topic-card {
  padding: 1.5rem 1.3rem;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.topic-card:hover,
.tool-card:hover,
.guide-card:hover,
.process-card:hover {
  transform: translateY(-4px);
  border-color: rgba(94,234,212,0.3);
  box-shadow: 0 18px 30px rgba(8, 15, 21, 0.26);
}

.topic-icon {
  display: inline-flex;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: rgba(94,234,212,0.09);
  color: var(--cyan);
  font-size: 1.2rem;
  margin-bottom: 1rem;
}

.topic-card .label {
  display: block;
  margin-bottom: 0.45rem;
  color: var(--muted);
  font-size: 0.75rem;
  font-family: "JetBrains Mono", monospace;
  text-transform: lowercase;
}

.topic-card h3 {
  margin: 0 0 0.7rem;
  font-size: 1.2rem;
  letter-spacing: -0.04em;
}

.topic-card p {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.topic-card .read-more {
  color: var(--cyan);
  font-size: 0.82rem;
  font-family: "JetBrains Mono", monospace;
}

.guide-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.guide-card {
  display: flex;
  flex-direction: column;
  min-height: 100%;
}

.guide-card-header {
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--line);
  background: rgba(148,163,184,0.025);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem;
  font-size: 0.72rem;
  color: var(--muted);
  font-family: "JetBrains Mono", monospace;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.55rem;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  color: var(--muted-strong);
  font-size: 0.68rem;
  text-transform: lowercase;
}

.badge.beginner { color: var(--cyan); border-color: rgba(94,234,212,0.25); }
.badge.intermediate { color: var(--amber); border-color: rgba(249,180,77,0.25); }

.guide-card-body {
  padding: 1.2rem 1rem 1.4rem;
}

.guide-card-body h3 {
  font-size: 1.15rem;
  margin: 0 0 0.8rem;
  letter-spacing: -0.04em;
}

.guide-card-body p {
  color: var(--muted);
  margin: 0 0 1rem;
}

.guide-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  margin-top: 1rem;
  color: var(--muted);
  font-size: 0.75rem;
  font-family: "JetBrains Mono", monospace;
}

.tool-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.tool-card {
  display: flex;
  flex-direction: column;
}

.tool-header {
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.72rem;
  color: var(--muted);
  font-family: "JetBrains Mono", monospace;
  background: rgba(17,24,39,0.45);
}

.tool-body {
  padding: 1.2rem 1rem 1.35rem;
}

.tool-body h3 {
  margin: 0 0 0.7rem;
  font-size: 1.08rem;
}

.tool-body p {
  margin: 0 0 1rem;
  color: var(--muted);
}

.tool-link {
  color: var(--cyan);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.82rem;
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.process-card {
  padding: 1.5rem 1.2rem;
}

.process-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: rgba(94,234,212,0.08);
  color: var(--cyan);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.8rem;
}

.process-card h3 {
  margin: 1rem 0 0.7rem;
  font-size: 1.2rem;
}

.process-card p {
  margin: 0;
  color: var(--muted);
}

.cta-panel {
  padding: clamp(2rem, 3vw, 3rem);
  border: 1px solid var(--line-strong);
  border-radius: 28px;
  background: linear-gradient(135deg, rgba(20,184,166,0.08), rgba(59,130,246,0.08), rgba(245,158,11,0.08));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.cta-panel h2 {
  margin: 0 0 0.5rem;
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.055em;
}

.cta-panel p {
  margin: 0;
  color: var(--muted);
  max-width: 660px;
}

.site-footer {
  padding: 2.5rem 0 3rem;
  border-top: 1px solid var(--line);
  margin-top: 3rem;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.footer-brand {
  min-width: 220px;
}

.footer-brand p {
  margin: 0.5rem 0 0;
  color: var(--muted);
}

.footer-links {
  display: flex;
  gap: clamp(2rem, 5vw, 5rem);
  flex-wrap: wrap;
}

.footer-col h4 {
  margin: 0 0 0.9rem;
  color: var(--muted);
  font-weight: 500;
  font-size: 0.78rem;
  text-transform: lowercase;
  font-family: "JetBrains Mono", monospace;
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.6rem;
}

.footer-col a {
  color: var(--text);
}

.footer-col a:hover,
.footer-col a:focus-visible {
  color: var(--cyan);
}

.footer-bottom {
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  color: var(--muted);
  font-size: 0.78rem;
  flex-wrap: wrap;
}

@media (max-width: 980px) {
  .hero-grid,
  .topic-grid,
  .guide-grid,
  .tool-grid,
  .process-grid {
    grid-template-columns: 1fr 1fr;
  }

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

  .nav-links {
    position: absolute;
    top: 78px;
    left: 0;
    right: 0;
    background: var(--header-bg);
    border-bottom: 1px solid var(--line);
    display: none;
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem 1rem 1.2rem;
  }

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

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-cta {
    display: none;
  }
}

@media (max-width: 640px) {
  .hero {
    padding-top: 3rem;
  }

  .topic-grid,
  .guide-grid,
  .tool-grid,
  .process-grid,
  .trust-bar {
    grid-template-columns: 1fr;
  }

  .section-header,
  .cta-panel,
  .footer-bottom,
  .footer-grid {
    flex-direction: column;
    align-items: flex-start;
  }

  .button {
    width: 100%;
  }

  .hero-actions {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .brand-cursor,
  .terminal-caret {
    animation: none;
  }
  .button,
  .topic-card,
  .tool-card,
  .guide-card,
  .process-card {
    transition: none;
  }
}