:root {
  --primary: #2d2d2d;
  --primary-light: #4a4a4a;
  --accent: #e85b72;
  --accent-hover: #d14460;
  --bg: #f7f8fc;
  --white: #ffffff;
  --text: #333333;
  --text-light: #6b7280;
  --border: #e5e7eb;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 6px 24px rgba(0, 0, 0, 0.13);
  --radius: 12px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

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

/* Header */
header {
  background: var(--white);
  color: var(--text);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

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

.logo-icon { display: inline-flex; align-items: center; height: 36px; }
.logo-icon img {
  height: 36px;
  width: auto;
  border-radius: 6px;
  display: block;
}

a.logo-text {
  display: inline-flex;
  align-items: center;
  height: 36px;
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 0.02em;
  line-height: 1;
}
a.logo-text:hover { color: var(--accent); }

.header-links {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}

.menu-toggle {
  display: none;
  background: transparent;
  border: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text);
  padding: 0;
}
.menu-toggle svg { width: 24px; height: 24px; display: block; }
.menu-toggle:hover { color: var(--accent); }

.header-links a {
  color: var(--text-light);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

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

/* Hero */
.hero {
  background: var(--white);
  color: var(--text);
  padding: 64px 24px 56px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.hero h1 {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--primary);
}

.hero p {
  font-size: 17px;
  max-width: 720px;
  margin: 0 auto;
  color: var(--text-light);
  line-height: 1.8;
}

/* Section */
.section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 64px 24px;
}

.section-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 32px;
  color: var(--primary);
}

/* Card Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: box-shadow 0.25s, transform 0.25s;
}

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

.card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--primary);
}

.card ul {
  list-style: none;
  padding: 0;
}

.card ul li {
  padding: 6px 0;
  font-size: 14px;
  border-bottom: 1px solid var(--border);
}

.card ul li:last-child {
  border-bottom: none;
}

.card ul li a {
  font-weight: 500;
}

.card ul li .sub-link {
  color: var(--accent);
  font-weight: 400;
  margin-left: 4px;
}

/* Materials */
.materials-section {
  background: var(--white);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.materials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.material-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: box-shadow 0.2s, transform 0.2s;
  background: var(--bg);
}

.material-item:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
  border-color: var(--accent);
}

.material-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--white);
  flex-shrink: 0;
}

.material-icon svg {
  width: 22px;
  height: 22px;
  fill: var(--primary);
}

.material-text {
  font-size: 15px;
  font-weight: 600;
  color: var(--primary);
}

.material-text small {
  display: block;
  font-size: 12px;
  color: var(--text-light);
  font-weight: 400;
  margin-top: 2px;
}

/* Footer */
footer {
  background: var(--white);
  color: var(--text-light);
  text-align: center;
  padding: 40px 24px;
  border-top: 1px solid var(--border);
}

footer a {
  color: var(--text);
  font-weight: 500;
}

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

.footer-copy {
  font-size: 13px;
  margin-top: 8px;
}

/* Getting Started */
.getting-started-section { background: var(--white); border-bottom: 1px solid var(--border); }

/* Platform tabs */
.platform-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 32px; border-bottom: 1px solid var(--border); padding-bottom: 0; }
.platform-tab { background: transparent; border: none; padding: 12px 20px; font-size: 15px; font-weight: 600; color: var(--text-light); cursor: pointer; border-bottom: 2px solid transparent; margin-bottom: -1px; transition: color 0.2s, border-color 0.2s; font-family: inherit; }
.platform-tab:hover { color: var(--accent); }
.platform-tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.platform-panel { display: block; }
.platform-panel.hidden { display: none; }
@media (max-width: 768px) {
  .platform-tab { padding: 10px 14px; font-size: 14px; }
}

.section-subtitle { font-size: 16px; color: var(--text-light); margin-top: -20px; margin-bottom: 32px; }
.steps-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.step { background: var(--bg); border-radius: var(--radius); padding: 28px; border: 1px solid var(--border); position: relative; display: flex; flex-direction: column; min-width: 0; transition: box-shadow 0.25s, transform 0.25s; }
.step:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.step-number { position: absolute; top: -14px; left: 24px; width: 32px; height: 32px; border-radius: 50%; background: var(--accent); color: var(--white); display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 15px; box-shadow: 0 2px 8px rgba(232, 91, 114, 0.3); }
.step h3 { font-size: 18px; font-weight: 700; margin: 8px 0 10px; color: var(--primary); }
.step p { font-size: 14px; color: var(--text-light); margin-bottom: 14px; line-height: 1.7; }
.step pre { background: var(--white); color: var(--text); padding: 14px 16px; border: 1px solid var(--border); border-radius: 8px; font-size: 13px; overflow-x: auto; margin-bottom: 14px; line-height: 1.6; font-family: "SFMono-Regular", Menlo, Consolas, monospace; }
.step pre code { background: transparent; padding: 0; color: inherit; font-size: inherit; }
.step .card-link { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; font-weight: 600; color: var(--accent); margin-top: auto; }
.step .card-link:hover { gap: 10px; }
.step .card-link::after { content: "\2192"; transition: margin-left 0.2s; }
.step .card-link + .card-link { margin-top: 6px; }

/* System Requirements */
.req-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }
.req-card { background: var(--white); border-radius: var(--radius); padding: 24px 28px; border: 1px solid var(--border); transition: box-shadow 0.2s; }
.req-card:hover { box-shadow: var(--shadow); }
.req-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 14px; color: var(--primary); }
.req-card ul { list-style: none; padding: 0; margin: 0; }
.req-card li { font-size: 14px; color: var(--text-light); padding: 4px 0; }
.req-card li::before { content: "\2022"; color: var(--accent); margin-right: 10px; font-weight: 700; }

/* Code block (standalone) */
.code-block { background: var(--white); color: var(--text); padding: 22px 24px; border: 1px solid var(--border); border-radius: var(--radius); font-size: 14px; line-height: 1.7; overflow-x: auto; font-family: "SFMono-Regular", Menlo, Consolas, monospace; }
.code-block code { background: transparent; color: inherit; font-family: inherit; padding: 0; }

/* Inline <code> in prose can wrap on long unbreakable strings (e.g. paths).
   <pre><code> blocks are unaffected because <pre> sets white-space: pre. */
code { overflow-wrap: anywhere; }

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 22px; transition: box-shadow 0.2s; }
.faq-item:hover { box-shadow: var(--shadow); }
.faq-item summary { font-weight: 600; cursor: pointer; color: var(--primary); list-style: none; display: flex; align-items: center; gap: 14px; font-size: 15px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::before { content: "+"; color: var(--accent); font-weight: 700; font-size: 22px; line-height: 1; width: 16px; flex-shrink: 0; }
.faq-item[open] summary::before { content: "\2212"; }
.faq-item p { margin-top: 14px; color: var(--text-light); font-size: 14px; line-height: 1.7; }
.faq-item p + p { margin-top: 10px; }
.faq-item code { background: var(--bg); padding: 2px 6px; border-radius: 4px; font-size: 13px; }

/* Responsive */
@media (max-width: 768px) {
  .hero h1 { font-size: 26px; }
  .menu-toggle { display: flex; }
  .header-links {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 24px;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    z-index: 99;
  }
  .header-links.open { display: flex; }
  .header-links a {
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    font-size: 15px;
  }
  .header-links a:last-child { border-bottom: none; }
  .card-grid { grid-template-columns: 1fr; }
  .materials-grid { grid-template-columns: 1fr; }
  .section { padding: 40px 16px; }
  .hero { padding: 48px 16px 40px; }
  .steps-grid { grid-template-columns: 1fr; }
  .req-grid { grid-template-columns: 1fr; }
}