/* ── Reset & base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #121C2D;
  --bg2: #1A2640;
  --bg3: #1F3550;
  --card: #1E2D44;
  --accent: #6366F1;
  --accent-h: #4F46E5;
  --accent-glow: rgba(99,102,241,0.18);
  --text: #E2E8F0;
  --text-muted: #94A3B8;
  --border: #2D3F5E;
  --radius: 10px;
  --radius-lg: 16px;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
}
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code {
  font-family: 'SFMono-Regular', Consolas, monospace;
  font-size: 0.88em;
  background: var(--bg3);
  padding: 2px 6px;
  border-radius: 4px;
  color: #a5b4fc;
}

/* ── Layout ── */
.container { max-width: 860px; margin: 0 auto; padding: 0 20px; }
.hidden { display: none !important; }

/* ── Navigation ── */
.site-nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(18,28,45,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1400px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; gap: 8px; height: 60px;
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-display); font-weight: 700;
  font-size: 0.9rem; color: var(--text); text-decoration: none;
  white-space: nowrap;
}
.nav-links::-webkit-scrollbar { display: none; }
.nav-logo img { border-radius: 6px; }
.nav-links {
  display: flex; align-items: center; gap: 4px; flex: 1;
  overflow-x: auto; flex-wrap: nowrap;
  scrollbar-width: none; -webkit-overflow-scrolling: touch;
}
.nav-links a, .nav-btn {
  color: var(--text-muted); font-size: 0.8rem; padding: 5px 10px;
  border-radius: 6px; transition: color 0.15s, background 0.15s;
  text-decoration: none; border: none; background: none; cursor: pointer;
  white-space: nowrap; flex-shrink: 0;
  font-family: var(--font-body);
}
.nav-links a:hover, .nav-btn:hover, .nav-links a.active {
  color: var(--text); background: var(--bg3);
}
.nav-links a.active { color: var(--accent); }
.nav-dropdown { position: relative; }
.nav-dropdown-menu {
  display: none; position: absolute; top: 100%; left: 0;
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: var(--radius); min-width: 240px;
  padding: 6px; box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}
.nav-dropdown:hover .nav-dropdown-menu { display: flex; flex-direction: column; }
.nav-dropdown-menu a {
  display: block; padding: 8px 12px; font-size: 0.875rem;
  color: var(--text-muted); border-radius: 6px;
}
.nav-dropdown-menu a:hover { background: var(--bg3); color: var(--text); }
.nav-hamburger {
  display: none; background: none; border: none; color: var(--text);
  font-size: 1.25rem; cursor: pointer; margin-left: auto;
}

/* ── Hero ── */
.hero {
  padding: 80px 20px 64px;
  background: radial-gradient(ellipse at 50% 0%, rgba(99,102,241,0.12) 0%, transparent 70%);
  text-align: center;
}
.hero-inner { max-width: 660px; margin: 0 auto; }
.hero-eyebrow {
  font-size: 0.8rem; font-weight: 600; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 16px;
}
.hero h1 {
  font-family: var(--font-display); font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700; line-height: 1.15; margin-bottom: 20px; color: var(--text);
}
.hero-sub { font-size: 1.05rem; color: var(--text-muted); max-width: 500px; margin: 0 auto; }
.accent { color: var(--accent); }

/* ── Page hero (inner pages) ── */
.page-hero {
  padding: 56px 20px 40px;
  background: radial-gradient(ellipse at 50% 0%, rgba(99,102,241,0.09) 0%, transparent 70%);
}
.page-hero .hero-eyebrow { text-align: left; }
.page-hero h1 {
  font-family: var(--font-display); font-size: clamp(1.6rem, 4vw, 2.6rem);
  font-weight: 700; line-height: 1.2; margin: 8px 0 12px;
}
.page-hero .hero-sub { color: var(--text-muted); font-size: 1rem; text-align: left; }

/* ── Calculator tabs ── */
.calcs-section { padding: 0 0 64px; }
.calc-tabs-nav {
  display: grid; grid-template-columns: repeat(4, auto); justify-content: center; gap: 8px; margin-bottom: 28px;
}
.calc-tabs-nav.scrollable {
  display: flex; flex-wrap: nowrap; overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: none; justify-content: flex-start;
}
.calc-tabs-nav::-webkit-scrollbar { display: none; }
.calc-tab {
  padding: 8px 18px; border-radius: 8px; font-size: 0.875rem; font-weight: 600;
  background: var(--bg2); color: var(--text-muted); border: 1px solid var(--border);
  cursor: pointer; transition: all 0.15s; white-space: nowrap; flex-shrink: 0;
  text-decoration: none; display: inline-block;
}
.calc-tab:hover { color: var(--text); border-color: var(--accent); text-decoration: none; }
.calc-tab.active {
  background: var(--accent); color: #fff; border-color: var(--accent);
}
.calc-panel { display: none; }
.calc-panel.active { display: block; }

/* ── Calculator card ── */
.calc-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px 28px 24px;
}
.calc-header { margin-bottom: 20px; }
.calc-header h2 {
  font-family: var(--font-display); font-size: 1.3rem; font-weight: 700; margin-bottom: 6px;
}
.calc-desc { color: var(--text-muted); font-size: 0.9rem; }

/* ── Mode toggle ── */
.calc-mode-toggle { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 20px; }
.mode-btn {
  padding: 7px 14px; border-radius: 7px; font-size: 0.825rem; font-weight: 500;
  background: var(--bg2); color: var(--text-muted); border: 1px solid var(--border);
  cursor: pointer; transition: all 0.15s;
}
.mode-btn:hover { color: var(--text); }
.mode-btn.active { background: var(--bg3); color: var(--accent); border-color: var(--accent); }

/* ── Inputs ── */
.calc-inputs { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; margin-bottom: 18px; }
.input-group { display: flex; flex-direction: column; gap: 6px; }
.input-group label { font-size: 0.825rem; font-weight: 500; color: var(--text-muted); }
.input-hint { font-size: 0.75rem; opacity: 0.65; }
.input-group input {
  background: var(--bg2); border: 1px solid var(--border); border-radius: 8px;
  padding: 10px 13px; color: var(--text); font-size: 0.95rem; font-family: var(--font-body);
  transition: border-color 0.15s; width: 100%;
}
.input-group input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }
.input-group input::placeholder { color: #4A5568; }

/* ── Buttons ── */
.calc-btn {
  background: var(--accent); color: #fff; border: none;
  padding: 11px 24px; border-radius: 8px; font-size: 0.95rem; font-weight: 600;
  cursor: pointer; transition: background 0.15s; font-family: var(--font-body);
}
.calc-btn:hover { background: var(--accent-h); }
.btn-primary {
  display: inline-block; background: var(--accent); color: #fff;
  padding: 12px 24px; border-radius: 8px; font-weight: 600; font-size: 0.95rem;
  transition: background 0.15s; text-decoration: none;
}
.btn-primary:hover { background: var(--accent-h); text-decoration: none; }
.btn-secondary {
  display: inline-block; background: transparent; color: var(--accent);
  padding: 10px 20px; border-radius: 8px; font-weight: 600; font-size: 0.9rem;
  border: 1px solid var(--accent); transition: all 0.15s; text-decoration: none;
  margin-top: 24px;
}
.btn-secondary:hover { background: var(--accent-glow); text-decoration: none; }

/* ── Result box ── */
.calc-result {
  background: linear-gradient(135deg, rgba(99,102,241,0.12), rgba(99,102,241,0.05));
  border: 1px solid rgba(99,102,241,0.35);
  border-radius: 10px; padding: 16px 20px; margin: 16px 0;
  font-family: var(--font-display); font-size: 1.5rem; font-weight: 700;
  color: var(--text);
}
.calc-result .result-label { font-size: 0.8rem; font-weight: 500; color: var(--text-muted); font-family: var(--font-body); margin-bottom: 4px; }

/* ── Formula ── */
.calc-formula {
  display: flex; align-items: center; gap: 10px; margin-top: 16px;
  padding-top: 16px; border-top: 1px solid var(--border);
}
.formula-label { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); font-weight: 600; }

/* ── Budget calculator ── */
.budget-section { padding: 0 0 64px; }
.budget-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 32px;
  display: flex; flex-direction: column; gap: 32px;
}
.budget-step h3 {
  font-family: var(--font-display); font-size: 1rem; font-weight: 600;
  margin-bottom: 14px; color: var(--text);
}
.market-grid, .channel-grid, .calc-direction-toggle, .objective-toggle {
  display: flex; flex-wrap: wrap; gap: 8px;
}
.market-btn, .channel-btn, .obj-btn, .dir-btn {
  padding: 8px 14px; border-radius: 8px; font-size: 0.85rem; font-weight: 500;
  background: var(--bg2); color: var(--text-muted); border: 1px solid var(--border);
  cursor: pointer; transition: all 0.15s;
}
.market-btn span { font-size: 0.75rem; opacity: 0.65; margin-left: 4px; }
.market-btn:hover, .channel-btn:hover, .obj-btn:hover, .dir-btn:hover { color: var(--text); border-color: var(--accent); }
.market-btn.active, .channel-btn.active, .obj-btn.active, .dir-btn.active {
  background: var(--accent); color: #fff; border-color: var(--accent);
}
.budget-benchmarks { border-top: 1px solid var(--border); padding-top: 24px; }
.budget-benchmarks h3 { font-size: 1rem; font-weight: 600; margin-bottom: 14px; }
.badge {
  background: var(--bg3); color: var(--text-muted); font-size: 0.75rem;
  padding: 2px 8px; border-radius: 20px; font-family: var(--font-body); font-weight: 500;
}
#benchmark-table table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
#benchmark-table th { text-align: left; color: var(--text-muted); font-weight: 500; padding: 7px 10px; border-bottom: 1px solid var(--border); }
#benchmark-table td { padding: 8px 10px; border-bottom: 1px solid rgba(45,63,94,0.5); }
#benchmark-table tr:last-child td { border-bottom: none; }

/* ── CTA section ── */
.tools-cta {
  background: linear-gradient(135deg, rgba(99,102,241,0.1), transparent);
  border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
  padding: 56px 20px; text-align: center; margin-bottom: 64px;
}
.tools-cta h2 { font-family: var(--font-display); font-size: 1.5rem; font-weight: 700; margin-bottom: 12px; }
.tools-cta p { color: var(--text-muted); margin-bottom: 24px; max-width: 500px; margin-left: auto; margin-right: auto; }

/* ── Guides ── */
.guides-preview { padding: 0 20px 80px; }
.guides-preview h2 { font-family: var(--font-display); font-size: 1.4rem; font-weight: 700; margin-bottom: 20px; }
.guide-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }
.guide-grid-full { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.guide-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; text-decoration: none; color: var(--text);
  transition: border-color 0.15s, transform 0.15s;
  display: flex; flex-direction: column; gap: 8px;
}
.guide-card:hover { border-color: var(--accent); transform: translateY(-2px); text-decoration: none; }
.guide-tag {
  display: inline-block; background: var(--accent-glow); color: var(--accent);
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
  padding: 3px 8px; border-radius: 4px; width: fit-content;
}
.guide-card h3 { font-size: 0.95rem; font-weight: 600; line-height: 1.3; }
.guide-card p { font-size: 0.85rem; color: var(--text-muted); }
.guides-full { padding: 0 20px 80px; }

/* ── Prose (guides inner pages) ── */
.prose-section { padding: 0 20px 64px; }
.prose { max-width: 720px; }
.prose h2 { font-family: var(--font-display); font-size: 1.2rem; font-weight: 700; margin: 36px 0 12px; color: var(--text); }
.prose p { color: var(--text-muted); margin-bottom: 14px; line-height: 1.75; }
.prose a { color: var(--accent); }
.prose code { font-size: 0.9rem; }

/* ── Footer ── */
.site-footer {
  background: var(--bg2); border-top: 1px solid var(--border);
  padding: 32px 20px;
}
.footer-inner {
  max-width: 1400px; margin: 0 auto;
  display: flex; flex-wrap: wrap; align-items: center; gap: 16px; justify-content: space-between;
}
.footer-brand { display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: 0.9rem; }
.footer-links { display: flex; gap: 16px; flex-wrap: wrap; }
.footer-links a { font-size: 0.85rem; color: var(--text-muted); }
.footer-links a:hover { color: var(--text); }
.footer-copy { font-size: 0.8rem; color: var(--text-muted); }

/* ── Responsive ── */
@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-hamburger { display: block; }
  .nav-links.open {
    display: flex; flex-direction: column; position: absolute;
    top: 60px; left: 0; right: 0; background: var(--bg2);
    border-bottom: 1px solid var(--border); padding: 12px;
    gap: 2px; z-index: 200;
  }
  .site-nav { position: relative; }
  .calc-tabs-nav { gap: 4px; padding-bottom: 4px; }
  .calc-card { padding: 20px 16px; }
  .budget-card { padding: 20px 16px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* ── Remove number input spinners ── */
input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
input[type=number] { -moz-appearance: textfield; appearance: textfield; }

/* ── Calculator hero (calc pages) ── */
.calc-hero { padding: 40px 0 0; }
.calc-hero .calc-card { margin-bottom: 0; }

/* ── Calc content section ── */
.calc-content { padding: 48px 0 80px; }

/* ── Inner tabs (ROAS page) ── */
.calc-tabs-inner { margin-bottom: 24px; }
.calc-tabs-inner .calc-tab {
  background: var(--bg2); color: var(--text-muted);
  border: 1px solid var(--border); border-radius: 8px;
  padding: 8px 18px; font-size: 0.875rem; font-weight: 600;
  cursor: pointer; transition: all 0.15s; text-decoration: none;
}
.calc-tabs-inner .calc-tab:hover { color: var(--text); border-color: var(--accent); }
.calc-tabs-inner .calc-tab.active {
  background: var(--accent); color: #fff; border-color: var(--accent);
}

/* ── Index metric grid ── */
.index-content { padding: 40px 0 0; }
.index-content h2 {
  font-family: var(--font-display); font-size: 1.4rem; font-weight: 700;
  margin-bottom: 16px;
}
.index-content > p { color: var(--text-muted); margin-bottom: 14px; max-width: 720px; line-height: 1.75; }
.metric-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px; margin-top: 28px;
}
.metric-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px 16px; text-decoration: none; color: var(--text);
  display: flex; flex-direction: column; gap: 5px;
  transition: border-color 0.15s, transform 0.15s;
}
.metric-card:hover { border-color: var(--accent); transform: translateY(-2px); text-decoration: none; }
.metric-abbr {
  font-family: var(--font-display); font-size: 1.1rem; font-weight: 700; color: var(--accent);
}
.metric-name { font-size: 0.8rem; font-weight: 600; color: var(--text); }
.metric-desc { font-size: 0.78rem; color: var(--text-muted); line-height: 1.4; margin-top: 2px; }

/* ── Nav overflow: scrollable on small screens ── */
@media (max-width: 900px) {
  .nav-links { overflow-x: auto; flex-wrap: nowrap; }
  .nav-links a { white-space: nowrap; }
}

/* ── Ad placements (hidden until AdSense approved) ── */
.ad-leaderboard {
  display: none; /* remove when AdSense approved */
  width: 100%; max-width: 728px; height: 90px;
  margin: 0 auto 24px; background: var(--bg2);
  border: 1px dashed var(--border); border-radius: 6px;
}
.ad-inline {
  display: none; /* remove when AdSense approved */
  width: 100%; margin: 32px 0;
  background: var(--bg2); border: 1px dashed var(--border);
  border-radius: 6px; min-height: 250px;
}
.ad-sidebar {
  display: none; /* remove when AdSense approved */
  width: 160px; min-height: 600px;
  background: var(--bg2); border: 1px dashed var(--border); border-radius: 6px;
}
.page-with-sidebar {
  display: flex; gap: 24px; align-items: flex-start;
}
.page-with-sidebar .sidebar-left,
.page-with-sidebar .sidebar-right {
  flex-shrink: 0; position: sticky; top: 80px;
}
.page-with-sidebar .main-col { flex: 1; min-width: 0; }
@media (max-width: 900px) {
  .ad-sidebar { display: none !important; }
  .page-with-sidebar { display: block; }
}

/* ── Affiliate boxes ── */
.affiliate-box {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px 22px;
  margin: 32px 0; display: flex; align-items: flex-start; gap: 16px;
}
.affiliate-box .aff-body { flex: 1; }
.affiliate-box .aff-label {
  font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--text-muted); font-weight: 600; margin-bottom: 4px;
}
.affiliate-box .aff-title {
  font-family: var(--font-display); font-size: 0.95rem;
  font-weight: 700; margin-bottom: 4px; color: var(--text);
}
.affiliate-box .aff-desc {
  font-size: 0.83rem; color: var(--text-muted); line-height: 1.5;
}
.affiliate-box .aff-cta {
  display: inline-block; margin-top: 10px; background: var(--accent);
  color: #fff; font-size: 0.8rem; font-weight: 600; padding: 7px 14px;
  border-radius: 6px; text-decoration: none; transition: background 0.15s;
}
.affiliate-box .aff-cta:hover { background: var(--accent-h); text-decoration: none; }
.affiliate-disclaimer {
  font-size: 0.72rem; color: #4A5568; margin-top: 8px;
}

/* ── FAQ section ── */
.faq-section { margin-top: 48px; }
.faq-section h2 {
  font-family: var(--font-display); font-size: 1.2rem;
  font-weight: 700; margin-bottom: 16px; color: var(--text);
}
.faq-item { border-bottom: 1px solid var(--border); padding: 16px 0; }
.faq-item:last-child { border-bottom: none; }
.faq-q {
  font-weight: 600; font-size: 0.92rem; color: var(--text);
  cursor: pointer; display: flex; justify-content: space-between;
  align-items: flex-start; gap: 12px; list-style: none;
  padding: 0; background: none; border: none; width: 100%; text-align: left;
}
.faq-q::after { content: '+'; color: var(--accent); font-size: 1.1rem; flex-shrink: 0; }
.faq-item.open .faq-q::after { content: '-'; }
.faq-a {
  display: none; font-size: 0.875rem; color: var(--text-muted);
  line-height: 1.75; padding-top: 10px;
}
.faq-item.open .faq-a { display: block; }

/* ── Index calc-tabs-nav responsive grid ── */
@media (max-width: 640px) {
  .calc-tabs-nav {
    grid-template-columns: repeat(2, 1fr);
  }
  .calc-tabs-nav .calc-tab {
    text-align: center;
  }
}