/* MacSentinel landing page — bright theme matching the security tool's identity.
   Color: trust-blue accent (shield ↔ security ↔ Apple system aesthetic) */

:root {
  --bg:           #ffffff;
  --bg-alt:       #f8fafc;          /* slate-50 */
  --bg-soft:      #f1f5f9;          /* slate-100 */
  --card:         #ffffff;
  --card-hover:   #f8fafc;
  --border:       #e2e8f0;          /* slate-200 */
  --border-strong:#cbd5e1;          /* slate-300 */
  --text:         #0f172a;          /* slate-900 */
  --text-dim:     #475569;          /* slate-600 */
  --muted:        #94a3b8;          /* slate-400 */
  --accent:       #2563eb;          /* blue-600 — security / trust */
  --accent-hover: #1d4ed8;          /* blue-700 */
  --accent-soft:  #dbeafe;          /* blue-100 */
  --success:      #059669;          /* emerald-600 */
  --shadow-sm:    0 1px 2px rgba(15,23,42,0.04);
  --shadow:       0 4px 12px rgba(15,23,42,0.06);
  --shadow-lg:    0 10px 30px rgba(15,23,42,0.10);
}

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

html, body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
               "Noto Sans TC", "PingFang TC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }
.accent { color: var(--accent); }
.muted  { color: var(--muted); font-size: 0.92em; }
a       { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }
code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  background: var(--bg-soft);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--accent-hover);
}

/* ─── Header ───────────────────────────────────────────────────────── */
.site-header {
  background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px;
}
.logo {
  font-size: 1.2rem; font-weight: 700; color: var(--text);
  display: inline-flex; align-items: center; gap: 8px;
}
.logo .logo-icon { font-size: 1.5rem; }
.logo span { color: var(--accent); }
.site-header nav { display: flex; gap: 22px; flex-wrap: wrap; }
.site-header nav a {
  color: var(--text-dim); font-size: 0.92rem; font-weight: 500;
  transition: color 0.15s;
}
.site-header nav a:hover { color: var(--accent); text-decoration: none; }

/* ─── Hero ─────────────────────────────────────────────────────────── */
.hero {
  padding: 88px 0 64px;
  text-align: center;
  background:
    radial-gradient(ellipse 800px 400px at 50% 0%, rgba(37,99,235,0.10), transparent 70%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-alt) 100%);
}
.hero h1 {
  font-size: 3rem; line-height: 1.15; margin-bottom: 18px;
  font-weight: 800; letter-spacing: -0.02em;
}
.hero h1 .gradient {
  background: linear-gradient(135deg, var(--accent) 0%, #0ea5e9 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lead {
  font-size: 1.18rem; color: var(--text-dim);
  max-width: 680px; margin: 0 auto 40px;
}
.badges {
  display: flex; gap: 10px; justify-content: center; margin-bottom: 36px;
  flex-wrap: wrap;
}
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--accent-soft); color: var(--accent-hover);
  padding: 6px 14px; border-radius: 999px;
  font-size: 0.85rem; font-weight: 600;
}
.badge.success { background: #d1fae5; color: #065f46; }

.download-buttons {
  display: flex; flex-wrap: wrap; gap: 14px;
  justify-content: center; margin-bottom: 14px;
}
.btn {
  display: inline-flex; flex-direction: column; align-items: center;
  padding: 16px 32px; border-radius: 14px;
  font-weight: 600; font-size: 1.05rem;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
  min-width: 240px;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn-primary {
  background: var(--accent); color: #fff;
  box-shadow: var(--shadow);
}
.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: var(--shadow-lg);
  color: #fff;
}
.btn-secondary {
  background: var(--card); color: var(--text);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-sm);
}
.btn-secondary:hover { background: var(--bg-soft); color: var(--text); }
.btn-sub { font-size: 0.78rem; font-weight: 400; opacity: 0.9; margin-top: 4px; }
.version-note { color: var(--muted); font-size: 0.88rem; margin-top: 10px; }

/* ─── Install card ─────────────────────────────────────────────────── */
.install-guides {
  margin-top: 48px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  max-width: 720px;
}
.install-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px 28px;
  box-shadow: var(--shadow-sm);
  text-align: left;
}
.install-card h3 { font-size: 1.05rem; margin-bottom: 12px; }
.install-card ol { padding-left: 22px; }
.install-card li { margin-bottom: 8px; color: var(--text-dim); }
.install-card li strong { color: var(--text); }
.install-tip {
  margin-top: 12px;
  background: var(--bg-soft);
  border-left: 3px solid var(--accent);
  padding: 10px 14px;
  border-radius: 6px;
  color: var(--text-dim);
  font-size: 0.92rem;
}

/* ─── Ad zone ──────────────────────────────────────────────────────── */
.ad-zone-wrap {
  display: flex; flex-direction: column; align-items: center;
  padding: 32px 16px; gap: 4px;
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.ad-label {
  color: var(--muted); font-size: 0.72rem;
  text-transform: uppercase; letter-spacing: 0.06em;
}

/* ─── Sections ─────────────────────────────────────────────────────── */
.section { padding: 72px 0; }
.section-alt { background: var(--bg-alt); }
.section h2 {
  font-size: 2.1rem; text-align: center; margin-bottom: 12px;
  font-weight: 700; letter-spacing: -0.01em;
}
.section-lead {
  text-align: center; color: var(--text-dim);
  max-width: 600px; margin: 0 auto 48px;
}

/* ─── Feature grid ─────────────────────────────────────────────────── */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 24px;
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}
.feature-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}
.feature-icon {
  font-size: 1.8rem; margin-bottom: 14px;
  display: inline-flex; align-items: center; justify-content: center;
  width: 48px; height: 48px;
  background: var(--accent-soft); border-radius: 12px;
}
.feature-card h3 {
  font-size: 1.1rem; margin-bottom: 8px;
  font-weight: 600;
}
.feature-card p {
  color: var(--text-dim); font-size: 0.95rem;
  line-height: 1.6;
}

/* ─── MCP highlight section ────────────────────────────────────────── */
.mcp-highlight {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%);
  color: #f1f5f9;
  border-radius: 24px;
  padding: 56px 48px;
  margin: 0 auto;
  max-width: 920px;
  text-align: center;
}
.mcp-highlight h2 {
  color: #fff; margin-bottom: 16px;
  background: linear-gradient(135deg, #93c5fd 0%, #67e8f9 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.mcp-highlight .lead { color: #cbd5e1; max-width: 640px; }
.mcp-tools {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-top: 32px;
  text-align: left;
}
.mcp-tool {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 0.88rem;
  color: #e2e8f0;
}
.mcp-tool code { background: rgba(255,255,255,0.08); color: #93c5fd; }

/* ─── FAQ ──────────────────────────────────────────────────────────── */
.faq-item {
  max-width: 760px; margin: 0 auto 18px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px 26px;
  box-shadow: var(--shadow-sm);
}
.faq-item h3 {
  font-size: 1.05rem; margin-bottom: 8px; color: var(--text);
}
.faq-item p { color: var(--text-dim); font-size: 0.95rem; }

/* ─── Ko-fi donation banner ────────────────────────────────────────── */
.kofi-banner {
  max-width: 920px; margin: 0 auto;
  background: linear-gradient(135deg, #fff7ed 0%, #ffedd5 100%);
  border: 1px solid #fed7aa;
  border-radius: 16px;
  padding: 22px 26px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 20px; flex-wrap: wrap;
}
.kofi-text { flex: 1; min-width: 240px; }
.kofi-text h4 { font-size: 1.05rem; margin-bottom: 4px; }
.kofi-text p { color: var(--text-dim); font-size: 0.92rem; }
.kofi-btn {
  background: #ff5e5b; color: #fff;
  padding: 12px 22px; border-radius: 10px;
  font-weight: 700; white-space: nowrap;
  box-shadow: var(--shadow);
  transition: background 0.15s, transform 0.15s;
}
.kofi-btn:hover {
  background: #ff3a37;
  color: #fff;
  text-decoration: none;
  transform: translateY(-1px);
}

/* ─── Footer ───────────────────────────────────────────────────────── */
.site-footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding: 40px 0 32px;
  margin-top: 64px;
  color: var(--text-dim);
  font-size: 0.9rem;
}
.footer-inner {
  display: flex; justify-content: space-between;
  flex-wrap: wrap; gap: 20px;
}
.footer-inner a { color: var(--text-dim); }
.footer-inner a:hover { color: var(--accent); }

/* ─── Responsive ───────────────────────────────────────────────────── */
@media (max-width: 720px) {
  .hero h1 { font-size: 2.2rem; }
  .lead { font-size: 1.05rem; }
  .section { padding: 56px 0; }
  .section h2 { font-size: 1.7rem; }
  .mcp-highlight { padding: 40px 24px; border-radius: 16px; }
  .btn { min-width: 100%; }
}