/* ======= RTX AI Unlock — Clean Tech Blog ======= */
:root {
  --bg: #f7f8fa;
  --card: #ffffff;
  --text: #1a1d24;
  --muted: #5b6472;
  --accent: #6200ee;
  --accent-bg: #ede7f6;
  --border: #e4e7ee;
  --code-bg: #1a1d24;
  --code-text: #e0e6f0;
  --warn-bg: #fff8e1;
  --warn-border: #ffe082;
  --warn-text: #7a5a00;
  --ok-bg: #e8f5e9;
  --ok-border: #a5d6a7;
  --ok-text: #2e7d32;
  --radius: 8px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
}

.container {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ======= Nav ======= */
nav {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 14px;
  padding-bottom: 14px;
}
nav .logo {
  font-weight: 700;
  font-size: 18px;
  color: var(--accent);
  text-decoration: none;
}
nav .logo span { color: var(--text); }
nav ul { list-style: none; display: flex; gap: 20px; }
nav ul a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color .2s;
}
nav ul a:hover { color: var(--accent); }

/* ======= Hero ======= */
.hero {
  padding: 60px 0 40px;
  text-align: center;
}
.hero h1 {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(90deg, #6200ee, #03a9f4);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero p.lead {
  font-size: 18px;
  color: var(--muted);
  max-width: 560px;
  margin: 0 auto 28px;
}
.hero .cta {
  display: inline-block;
  background: var(--accent);
  color: white;
  padding: 12px 28px;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  transition: transform .15s, box-shadow .15s;
}
.hero .cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(98, 0, 238, .25);
}

/* ======= Article / Content ======= */
article {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
  margin: 30px 0;
}
article h1 {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 8px;
  line-height: 1.3;
}
article .meta {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 28px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
article h2 {
  font-size: 22px;
  font-weight: 700;
  margin: 36px 0 16px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--accent-bg);
}
article h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--accent);
}
article p { margin-bottom: 16px; }
article ul, article ol {
  margin: 12px 0 20px 24px;
}
article li { margin-bottom: 8px; }
article strong { font-weight: 700; }
article em { font-style: italic; color: var(--muted); }
article a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}
article a:hover { text-decoration: none; }

/* ======= Callout Boxes ======= */
.callout {
  border-radius: var(--radius);
  padding: 18px 22px;
  margin: 22px 0;
  font-size: 15px;
}
.callout.warn {
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  color: var(--warn-text);
}
.callout.ok {
  background: var(--ok-bg);
  border: 1px solid var(--ok-border);
  color: var(--ok-text);
}
.callout.info {
  background: var(--accent-bg);
  border: 1px solid #d1c4e9;
  color: #4a148c;
}
.callout strong { display: block; margin-bottom: 6px; font-size: 16px; }

/* ======= Code ======= */
code {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 2px 7px;
  border-radius: 4px;
  font-family: 'SF Mono', 'Fira Code', Menlo, Consolas, monospace;
  font-size: 13.5px;
}
pre {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 18px 22px;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 16px 0 22px;
}
pre code {
  background: none;
  padding: 0;
  font-size: 14px;
  line-height: 1.65;
}

/* ======= Table ======= */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0 28px;
  font-size: 15px;
}
th, td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}
th {
  background: var(--accent-bg);
  font-weight: 700;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #4a148c;
}
tr:hover td { background: #fafaff; }
td.num { font-family: 'SF Mono', monospace; text-align: right; }
td.better { color: var(--ok-text); font-weight: 700; }

/* ======= AdSense Placeholder ======= */
.ad-slot {
  background: repeating-linear-gradient(
    45deg,
    #f0f2f7,
    #f0f2f7 10px,
    #e8ebf2 10px,
    #e8ebf2 20px
  );
  border: 1px dashed #c5c9d6;
  border-radius: var(--radius);
  text-align: center;
  padding: 28px;
  margin: 24px 0;
  color: var(--muted);
  font-size: 13px;
}
.ad-slot::before { content: "📌"; font-size: 22px; display: block; margin-bottom: 8px; }

/* ======= Grid of Guides ======= */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
  margin: 24px 0;
}
.grid a.card {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  text-decoration: none;
  color: var(--text);
  transition: transform .15s, box-shadow .15s, border-color .15s;
}
.grid a.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,.08);
  border-color: var(--accent);
}
.grid a.card h3 {
  color: var(--text);
  margin: 0 0 8px;
  font-size: 17px;
}
.grid a.card p {
  color: var(--muted);
  font-size: 14px;
  margin: 0;
}
.grid a.card .badge {
  display: inline-block;
  background: var(--accent-bg);
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 20px;
  text-transform: uppercase;
  margin-bottom: 10px;
}

/* ======= GPU Checker ======= */
.gpu-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 10px;
  margin: 16px 0;
}
.gpu-list div {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 600;
  text-align: center;
}
.gpu-list div.yes { color: var(--ok-text); border-color: var(--ok-border); }
.gpu-list div.no { color: #c62828; }

/* ======= Footer ======= */
footer {
  text-align: center;
  padding: 40px 0 60px;
  color: var(--muted);
  font-size: 14px;
  border-top: 1px solid var(--border);
  margin-top: 60px;
}
footer a {
  color: var(--muted);
  text-decoration: none;
  margin: 0 8px;
}
footer a:hover { color: var(--accent); }

/* ======= Step-by-Step ======= */
.steps { counter-reset: step; }
.steps .step {
  position: relative;
  padding-left: 52px;
  margin-bottom: 28px;
}
.steps .step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: 2px;
  width: 36px;
  height: 36px;
  background: var(--accent);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 15px;
}
.steps .step h3 {
  margin-top: 0;
  color: var(--text);
  border-bottom: none;
  padding-bottom: 0;
}

/* ======= Responsive ======= */
@media (max-width: 600px) {
  article { padding: 24px; margin: 16px 0; }
  article h1 { font-size: 24px; }
  article h2 { font-size: 19px; }
  .hero { padding: 36px 0 24px; }
  .hero h1 { font-size: 28px; }
  nav .container { flex-wrap: wrap; gap: 10px; }
  table { font-size: 13px; }
  th, td { padding: 8px 10px; }
}