:root {
  --u: 8px;
  --bg: #0d1117;
  --surface: #161b22;
  --border: #30363d;
  --text: #c9d1d9;
  --muted: #8b949e;
  --white: #ffffff;
  --accent: #58a6ff;
  --green: #3fb950;
  --green-dim: rgba(63, 185, 80, 0.08);
  --col-a: 3fr;
  --col-b: 2fr;
  --t-xs: 11px;
  --t-sm: 13px;
  --t-base: 16px;
  --t-md: 18px;
  --t-ld: 20px;
  --t-lg: 24px;
  --t-xl: 32px;
  --t-2xl: 40px;
  --t-3xl: 52px;
}
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial,
    sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: var(--t-base);
}
.container {
  max-width: 1800px;
}

/* NAV */
nav {
  padding: calc(var(--u) * 3) calc(var(--u) * 3);
  width: 100%;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(13, 17, 23, 0.97);
  backdrop-filter: blur(10px);
  z-index: 100;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  font-size: var(--t-ld);
  font-weight: 700;
  color: var(--white);
  letter-spacing: 3px;
  text-decoration: none;
  padding-left: 5%;
}
.nav-links {
  display: flex;
  gap: calc(var(--u) * 3);
  list-style: none;
  align-items: center;
  padding-left: 30%;
  align-items: center;
}




.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: var(--t-base);
  transition: color 0.15s;
}
.nav-links a:hover {
  color: var(--white);
}

.nav-links .btn {
  color: #000;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
}

.hamburger span {
  width: 25px;
  height: 2px;
  background: var(--white);
  display: block;
}

/* BUTTONS */
.btn {
  display: inline-block;
  padding: calc(var(--u) * 1.5) calc(var(--u) * 3);
  border-radius: 6px;
  font-size: var(--t-sm);
  font-weight: 600;
  text-decoration: none;
  transition: opacity 0.15s;
  cursor: pointer;
  border: none;
  line-height: 1;
  font-family: inherit;
}
.btn:hover {
  opacity: 0.85;
}
.btn-primary {
  background: var(--accent);
  color: #000;
}
.btn-primary:hover {
  color: white;
}
.btn-ghost {
  background: transparent;
  color: var(--white);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.4);
}
.btn-lg {
  padding: calc(var(--u) * 2) calc(var(--u) * 4);
  font-size: var(--t-base);
}
.btn-group {
  display: flex;
  gap: calc(var(--u) * 2);
  flex-wrap: wrap;
  margin-top: calc(var(--u) * 5);
}

/* SECTIONS */
section {
  padding: calc(var(--u) * 12) 0;
}
section + section {
  border-top: 1px solid var(--border);
}
.section-label {
  display: flex;
  flex-direction: column;
  font-size: var(--t-xs);
  font-weight: 700;

  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: calc(var(--u) * 2);
}

/* TYPE */
h1 {
  font-size: var(--t-3xl);
  font-weight: 800;
  color: var(--white);
  line-height: 1.15;
  letter-spacing: -0.5px;
  margin-bottom: calc(var(--u) * 3);
}
h2 {
  font-size: var(--t-xl);
  font-weight: 700;
  color: var(--white);
  margin-bottom: calc(var(--u) * 4);
}
h3 {
  font-size: var(--t-md);
  font-weight: 600;
  color: var(--white);
  margin-bottom: calc(var(--u) * 1.5);
}
p {
  font-size: var(--t-base);
  margin-bottom: calc(var(--u) * 2.5);
}
.lead {
  font-size: var(--t-md);
  color: var(--muted);
  line-height: 1.75;
  margin-bottom: 0;
}

/* HERO */

.content-section {
  padding: 8% 5%;
}
.hero-grid {
  display: grid;
  grid-template-columns: var(--col-a) var(--col-b);
  align-items: center;
  gap: 5%;
}
.hero-img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 6px;
}
.hero-img svg {
  width: 100%;
  max-width: 520px;
  height: auto;
  display: block;
  margin: 0 auto;
}

/* PROBLEM */
.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: calc(var(--u) * 3);
}
.problem-card {
  border-left: 2px solid var(--border);
  padding-left: calc(var(--u) * 2.5);
}
.problem-card h3 {
  font-size: var(--t-base);
  color: var(--white);
  margin-bottom: calc(var(--u) * 1);
  line-height: 1.4;
}
.problem-card p {
  font-size: var(--t-sm);
  color: var(--muted);
  margin: 0;
  line-height: 1.65;
}

/* STEPS */
.steps {
  display: flex;
  flex-direction: column;
  gap: calc(var(--u) * 10);
}
.step {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: calc(var(--u) * 6);
}
.step-text {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.step-num {
  font-size: var(--t-xs);
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: calc(var(--u) * 1);
}
.step-text p {
  font-size: var(--t-base);
  color: var(--text);
  margin: 0;
  line-height: 2;
}

/* CODE */
pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: calc(var(--u) * 2.5);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: var(--t-xs);
  line-height: 1.7;
  color: #e6edf3;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-x: hidden;
}
.c {
  color: #8b949e;
}
.k {
  color: #ff7b72;
}
.s {
  color: #a5d6ff;
}
.n {
  color: #79c0ff;
}
.v {
  color: #ffa657;
}

/* SHARED CARD */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: calc(var(--u) * 3);
}
.card h3 {
  font-size: var(--t-base);
  font-weight: 600;
  color: var(--white);
  margin-bottom: calc(var(--u) * 1);
}
.card p {
  font-size: var(--t-sm);
  color: var(--muted);
  margin: 0;
  line-height: 1.65;
}

/* GRIDS */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: calc(var(--u) * 2.5);
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: calc(var(--u) * 2.5);
}

/* EARLY ACCESS */
.cta-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: calc(var(--u) * 8);
  align-items: end;
}

.cta-left {
  display: flex;
  flex-direction: column;
  height: 100%;
  justify-content: space-between;
}
.cta-left h2 {
  margin-bottom: calc(var(--u) * 2);
  display: flex;
  flex-direction: column;
}
.cta-left > p {
  color: var(--muted);
  font-size: var(--t-md);
  line-height: 1.75;
  margin-bottom: calc(var(--u) * 4);
}

.validate-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.validate-header {
  padding: calc(var(--u) * 2) calc(var(--u) * 3);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.validate-header span {
  font-size: var(--t-xs);
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent);
}
.validate-item {
  display: flex;
  gap: calc(var(--u) * 2);
  padding: calc(var(--u) * 2) calc(var(--u) * 3);
  border-bottom: 1px solid var(--border);
  font-size: var(--t-sm);
  color: var(--text);
  line-height: 1.55;
}
.validate-item:last-child {
  border-bottom: none;
}
.vi-num {
  font-size: var(--t-xs);
  font-weight: 700;
  color: var(--accent);
  flex-shrink: 0;
  padding-top: 2px;
  flex: 1;
}
.cta-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: calc(var(--u) * 4);
  height: 100%;
}
.cta-form h3 {
  font-size: var(--t-lg);
  margin-bottom: calc(var(--u) * 3);
}
.form-field {
  margin-bottom: calc(var(--u) * 2.5);
}
.form-field label {
  display: block;
  font-size: var(--t-xs);
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: calc(var(--u) * 1);
}
.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  padding: calc(var(--u) * 1.5) calc(var(--u) * 2);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--white);
  font-size: var(--t-sm);
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s;
}
.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  border-color: var(--accent);
}
.form-field input::placeholder,
.form-field textarea::placeholder {
  color: var(--muted);
}
.form-field select option {
  background: var(--surface);
}
.form-field textarea {
  resize: vertical;
  min-height: 80px;
  line-height: 1.6;
}
.form-submit {
  width: 100%;
  padding: calc(var(--u) * 2) 0;
  background: var(--accent);
  color: #000;
  font-weight: 700;
  font-size: var(--t-base);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: opacity 0.15s;
  font-family: inherit;
}
.form-submit:hover {
  opacity: 0.85;
  color: white;
}
.form-note {
  font-size: var(--t-xs);
  color: var(--muted);
  text-align: center;
  margin-top: calc(var(--u) * 2);
  line-height: 1.6;
}

/* FOOTER */
footer {
  border-top: 1px solid var(--border);
  padding: calc(var(--u) * 4) 0 calc(var(--u) * 3);
}
footer .content-section {
  padding: 0 5%;
}
.footer-top {
  display: grid;
  grid-template-columns: var(--col-a) var(--col-b);
  gap: calc(var(--u) * 8);
  padding-bottom: calc(var(--u) * 3);
  border-bottom: 1px solid var(--border);
  margin-bottom: calc(var(--u) * 2);
}
.footer-brand .f-logo {
  font-size: var(--t-md);
  font-weight: 700;
  color: var(--white);
  letter-spacing: 3px;
  display: block;
  margin-bottom: 2px;
}
.footer-brand .f-by {
  font-size: var(--t-xs);
  color: var(--muted);
  margin-bottom: calc(var(--u) * 1);
  display: block;
}
.footer-brand .f-by a {
  color: var(--muted);
  text-decoration: none;
}
.footer-brand .f-by a:hover {
  color: var(--white);
}
.footer-brand p {
  font-size: var(--t-sm);
  color: var(--muted);
  line-height: 1.7;
  margin: 0;
  max-width: 380px;
}
.footer-nav {
  display: flex;
  gap: calc(var(--u) * 6);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}
.footer-col h4 {
  font-size: var(--t-xs);
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: calc(var(--u) * 2);
}
.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: calc(var(--u) * 1.5);
}
.footer-col a {
  font-size: var(--t-sm);
  color: var(--text);
  text-decoration: none;
  transition: color 0.15s;
}
.footer-col a:hover {
  color: var(--white);
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: calc(var(--u) * 2);
}
.footer-bottom p {
  font-size: var(--t-xs);
  color: var(--muted);
  margin: 0;
}
.footer-bottom-links {
  display: flex;
  gap: calc(var(--u) * 3);
}
.footer-bottom-links a {
  font-size: var(--t-xs);
  color: var(--muted);
  text-decoration: none;
  pointer-events: none;
}
.footer-bottom-links a:hover {
  color: var(--white);
}

/* RESPONSIVE */
@media (max-width: 960px) {
  .hero-img {
    display: flex;
    justify-content: center;
  }
  
  .hero-img svg {
    max-width: 420px;
    margin-top: 20px;
  }
  .hamburger {
    display: flex;
  }
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--bg);

    flex-direction: column;
    align-items: center;
    justify-content: center;

    padding: 30px 30px;
    gap: 25px;

   

    display: none;
  }
  .nav-links li {
    text-align: center;
  }


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

  h1 {
    font-size: var(--t-2xl);
  }
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .step {
    grid-template-columns: 1fr;
    gap: calc(var(--u) * 3);
  }
  .problem-grid {
    grid-template-columns: 1fr 1fr;
  }
  .grid-3 {
    grid-template-columns: 1fr 1fr;
  }
  .cta-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: calc(var(--u) * 5);
  }
}

@media (max-width: 600px) {
  .hero-img svg {
    max-width: 320px;
  }
  h1 {
    font-size: var(--t-xl);
  }
  h2 {
    font-size: var(--t-lg);
  }
  .lead {
    font-size: var(--t-base);
  }
  section {
    padding: calc(var(--u) * 8) 0;
  }
  .nav-links {
    display: none;
  }
  .problem-grid {
    grid-template-columns: 1fr;
  }
  .grid-2 {
    grid-template-columns: 1fr;
  }
  .grid-3 {
    grid-template-columns: 1fr;
  }
  .footer-nav {
    flex-direction: column;
    gap: calc(var(--u) * 4);
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
  .nav-links {
    width: 100%;
  }
}