:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --text: #0f172a;
  --text-muted: #64748b;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-soft: #eef2ff;
  --success: #16a34a;
  --success-soft: #dcfce7;
  --error: #dc2626;
  --error-soft: #fee2e2;
  --warning: #d97706;
  --warning-soft: #fef3c7;
  --code-bg: #f1f5f9;
  --shadow-sm: 0 1px 2px rgba(15,23,42,.06);
  --shadow-md: 0 4px 14px rgba(15,23,42,.06), 0 1px 3px rgba(15,23,42,.04);
  --radius: 12px;
  --radius-sm: 8px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 24px;
}
/* Walkthrough pages need more horizontal room so screenshots render large enough to read. */
.walkthrough-page .main-content .container,
.walkthrough-page main.container { max-width: 1280px; }
.walkthrough-page .step { padding: 20px 20px 20px 20px; }
.walkthrough-page .step::before { top: 22px; left: 20px; width: 28px; height: 28px; font-size: 13px; }
.walkthrough-page .step-body { padding-left: 40px; }

/* Header */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(180%) blur(8px);
}
.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.brand {
  font-weight: 700;
  font-size: 16px;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
}
.nav-email { color: var(--text-muted); }
.btn-link {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font: inherit;
  padding: 0;
}
.btn-link:hover { text-decoration: underline; }
.inline-form { display: inline; }

/* Main */
.main-content { padding: 40px 0 80px; }

/* Hero */
.hero {
  text-align: center;
  padding: 32px 0;
}
.hero-tight { padding: 16px 0 32px; }
.hero h1 {
  margin: 0 0 8px;
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.hero p { margin: 0; font-size: 17px; color: var(--text-muted); }
.muted { color: var(--text-muted); }

/* Card */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}
.card h2 {
  margin: 0 0 8px;
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.card h3 {
  margin: 0 0 12px;
  font-size: 16px;
  font-weight: 600;
}
.card > .muted { margin-top: 0; margin-bottom: 20px; }

/* Auth card */
.auth-card { max-width: 440px; margin: 0 auto 24px; }
.info-card { max-width: 440px; margin: 0 auto; }
.info-card ul { padding-left: 20px; margin: 12px 0 0; color: var(--text-muted); }
.info-card li { margin-bottom: 6px; }

/* Form */
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-weight: 500;
  font-size: 14px;
  margin-bottom: 6px;
  color: var(--text);
}
.form-group input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-family: inherit;
  transition: border-color .15s, box-shadow .15s;
}
.form-group input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.form-hint {
  margin: 6px 0 0;
  font-size: 13px;
  color: var(--text-muted);
}

/* Buttons */
.btn {
  appearance: none;
  background: var(--accent);
  color: white;
  border: none;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: background .15s, transform .1s;
  text-decoration: none;
  display: inline-block;
}
.btn:hover { background: var(--accent-hover); }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); }
.btn-block { display: block; width: 100%; }

/* Alerts */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  margin-bottom: 16px;
}
.alert-error { background: var(--error-soft); color: var(--error); }
.alert-success { background: var(--success-soft); color: var(--success); }

/* Settings grid */
.settings-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}
.setting {
  display: grid;
  grid-template-columns: 200px 1fr auto;
  align-items: center;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}
.setting:last-child { border-bottom: none; }
@media (max-width: 600px) {
  .setting { grid-template-columns: 1fr; gap: 4px; padding: 14px 0; }
}
.setting-label { font-size: 14px; color: var(--text-muted); }
.setting-value {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 14px;
  background: var(--code-bg);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  word-break: break-all;
}
.copy-btn {
  appearance: none;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  color: var(--text-muted);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all .15s;
  font-family: inherit;
}
.copy-btn:hover { color: var(--accent); border-color: var(--accent); }
.copy-btn.copied { color: var(--success); border-color: var(--success); }
.pill {
  display: inline-block;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-left: 6px;
}

/* Platform tiles */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 14px;
  margin-top: 20px;
}
.platform-tile {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 24px 16px;
  text-align: center;
  text-decoration: none;
  color: var(--text);
  transition: all .15s;
}
.platform-tile:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.platform-icon { font-size: 36px; line-height: 1; margin-bottom: 8px; }
.platform-name { font-weight: 600; font-size: 15px; }
.platform-detail { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

/* Walkthrough */
.back-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  display: inline-block;
  margin: 0 0 16px;
}
.back-link:hover { color: var(--accent); }

.settings-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  margin-bottom: 24px;
  font-size: 14px;
}
.settings-strip > div { display: flex; align-items: center; gap: 8px; }
.strip-label { color: var(--text-muted); font-size: 12px; text-transform: uppercase; letter-spacing: 0.04em; }
.settings-strip code {
  font-family: ui-monospace, SFMono-Regular, monospace;
  background: var(--code-bg);
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 13px;
}

/* Step list */
.steps { list-style: none; padding: 0; margin: 0 0 32px; counter-reset: step; }
.step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
  counter-increment: step;
  position: relative;
}
.step::before {
  content: counter(step);
  position: absolute;
  top: 28px;
  left: 28px;
  width: 32px;
  height: 32px;
  background: var(--accent);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
}
.step-body { padding-left: 52px; }
.step h3 { margin: 4px 0 8px; font-size: 17px; font-weight: 600; }
.step p { margin: 0 0 16px; }
.step p:last-of-type { margin-bottom: 0; }

/* Screenshot + overlays */
.screenshot-wrap {
  position: relative;
  display: block;
  width: 100%;
  margin: 16px 0 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
}
.screenshot {
  display: block;
  width: 100%;
  height: auto;
}
.screenshot-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--code-bg);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 60px 24px;
  color: var(--text-muted);
  font-size: 13px;
  font-family: ui-monospace, SFMono-Regular, monospace;
  text-align: center;
  margin: 16px 0 0;
}
.overlay {
  position: absolute;
  pointer-events: none;
  box-sizing: border-box;
}
.overlay-badge {
  background: rgb(167, 33, 33);
  color: white;
  padding: 3px 5px;
  border: 1px solid #1e90ff;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, monospace;
  font-size: clamp(5px, 1vw, 7px);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  height: auto;
  line-height: 1.3;
}
.overlay-click {
  background: transparent;
  border: 1px solid #1e90ff;
  border-radius: 7px;
  box-shadow: 0 0 0 4px rgba(167,33,33,0.18);
  animation: click-pulse 1.6s ease-in-out infinite;
}
.overlay-click::after {
  content: attr(data-label);
  position: absolute;
  left: 50%;
  top: 100%;
  transform: translate(-50%, 6px);
  background: rgb(167, 33, 33);
  color: white;
  font-size: clamp(5px, 1vw, 7px);
  font-weight: 600;
  padding: 1px 5px;
  border: 1px solid #1e90ff;
  border-radius: 7px;
  white-space: nowrap;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
@keyframes click-pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(167,33,33,0.18); }
  50% { box-shadow: 0 0 0 10px rgba(167,33,33,0.05); }
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
  background: var(--surface);
}
.site-footer p { margin: 0; }