:root {
  --bg: #0b1220;
  --bg-elevated: #111a2e;
  --bg-card: #16213a;
  --border: #24304a;
  --text: #e8ecf5;
  --text-muted: #9aa7c2;
  --accent: #ff2d6d;
  --accent-2: #25f4c4;
  --accent-soft: rgba(255,45,109,0.12);
  --success: #25f4c4;
  --warning: #ffb74a;
  --danger: #ff5c6c;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0,0,0,0.35);
  --font-display: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;
}

[data-theme="light"] {
  --bg: #f6f7fb;
  --bg-elevated: #ffffff;
  --bg-card: #ffffff;
  --border: #e3e7f0;
  --text: #10162a;
  --text-muted: #5a6786;
  --accent-soft: rgba(255,45,109,0.08);
  --shadow: 0 10px 30px rgba(20,25,50,0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { font-family: var(--font-display); margin: 0 0 0.5em; line-height: 1.15; }
p { margin: 0 0 1em; color: var(--text-muted); }

.skip-link {
  position: absolute; left: -999px; top: 0; background: var(--accent); color: #fff;
  padding: 10px 16px; z-index: 1000; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

button { font-family: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 2px; }

/* ================= HEADER ================= */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 1280px; margin: 0 auto; padding: 14px 20px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.logo { display: flex; align-items: center; gap: 8px; font-family: var(--font-display); font-weight: 700; font-size: 18px; }
.logo-mark {
  width: 34px; height: 34px; border-radius: 9px; background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0b1220; display: flex; align-items: center; justify-content: center; font-size: 13px; font-weight: 800;
}
.main-nav { flex: 1; display: flex; justify-content: center; }
.nav-list { list-style: none; display: flex; gap: 28px; margin: 0; padding: 0; align-items: center; }
.nav-list > li { position: relative; }
.nav-list > li > a, .nav-toggle {
  background: none; border: none; color: var(--text); font-size: 14.5px; font-weight: 500;
  display: flex; align-items: center; gap: 6px; padding: 8px 0;
}
.nav-toggle .chev { opacity: 0.6; }

.mega-panel {
  display: none;
  position: absolute; top: 100%; left: 50%; transform: translateX(-50%);
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 18px; gap: 24px; min-width: 520px;
  grid-template-columns: repeat(3, 1fr);
}
.has-mega:hover .mega-panel, .has-mega.open .mega-panel { display: grid; }
.mega-col { display: flex; flex-direction: column; gap: 10px; }
.mega-col a { font-size: 14px; color: var(--text-muted); padding: 4px 0; }
.mega-col a:hover, .mega-col a.active { color: var(--accent); }

.header-actions { display: flex; align-items: center; gap: 12px; }
.theme-toggle {
  width: 38px; height: 38px; border-radius: 50%; border: 1px solid var(--border); background: var(--bg-card);
  color: var(--text); display: flex; align-items: center; justify-content: center;
}
.icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

.hamburger { display: none; width: 38px; height: 38px; border: 1px solid var(--border); border-radius: 8px; background: var(--bg-card); flex-direction: column; align-items: center; justify-content: center; gap: 4px; }
.hamburger span { width: 18px; height: 2px; background: var(--text); border-radius: 2px; }

.mobile-nav {
  display: none; flex-direction: column; background: var(--bg-elevated); border-top: 1px solid var(--border);
  padding: 10px 20px 16px;
}
.mobile-nav a { padding: 10px 0; border-bottom: 1px solid var(--border); font-size: 15px; }
.mobile-nav a.active { color: var(--accent); }
.mobile-nav.open { display: flex; }

@media (max-width: 900px) {
  .main-nav { display: none; }
  .hamburger { display: flex; }
}

/* ================= BREADCRUMB ================= */
.breadcrumb { background: var(--bg); border-bottom: 1px solid var(--border); }
.breadcrumb-inner { max-width: 1280px; margin: 0 auto; padding: 10px 20px; font-size: 13px; color: var(--text-muted); display: flex; gap: 6px; flex-wrap: wrap; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .current { color: var(--text); }
.breadcrumb .sep { opacity: 0.5; }

/* ================= HERO / TOOL ================= */
.hero { padding: 56px 20px 40px; background: radial-gradient(circle at 20% 0%, var(--accent-soft), transparent 55%); }
.hero-inner { max-width: 1100px; margin: 0 auto; display: grid; gap: 40px; }
.eyebrow {
  display: inline-block; font-size: 12.5px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--accent); background: var(--accent-soft); padding: 6px 12px; border-radius: 999px; margin-bottom: 14px;
}
.hero h1 { font-size: clamp(28px, 5vw, 44px); }
.hero-sub { font-size: 16.5px; max-width: 620px; }

.tool-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; box-shadow: var(--shadow);
}
.field-row { margin-bottom: 18px; }
.field-row label { display: block; font-size: 13.5px; font-weight: 600; margin-bottom: 6px; }
.field-row input, .field-row select {
  width: 100%; padding: 12px 14px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); font-size: 14.5px; font-family: inherit;
}
.field-row input:focus, .field-row select:focus { border-color: var(--accent); }
.field-error { color: var(--danger); font-size: 12.5px; margin: 6px 0 0; min-height: 16px; }
.field-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
@media (max-width: 640px) { .field-grid { grid-template-columns: 1fr; } }

.btn-primary {
  width: 100%; background: linear-gradient(135deg, var(--accent), #ff6b9d); color: #fff; border: none;
  border-radius: 10px; padding: 14px 20px; font-size: 15.5px; font-weight: 700; display: flex; align-items: center;
  justify-content: center; gap: 10px; transition: transform 0.15s ease, opacity 0.15s ease;
}
.btn-primary:hover { transform: translateY(-1px); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }
.btn-primary.sm { width: auto; padding: 8px 16px; font-size: 13.5px; }
.btn-spinner {
  width: 16px; height: 16px; border-radius: 50%; border: 2px solid rgba(255,255,255,0.4); border-top-color: #fff;
  display: none; animation: spin 0.7s linear infinite;
}
.btn-primary.loading .btn-spinner { display: inline-block; }
.btn-primary.loading .btn-label { opacity: 0.8; }
@keyframes spin { to { transform: rotate(360deg); } }
.form-hint { text-align: center; font-size: 12.5px; margin: 12px 0 0; }

/* ================= RESULTS ================= */
.results-section { padding: 20px 20px 60px; }
.results-inner { max-width: 1100px; margin: 0 auto; }
.results-head { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.results-head h2 { font-size: 20px; }
.results-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.btn-secondary {
  background: var(--bg-card); border: 1px solid var(--border); color: var(--text); padding: 9px 16px;
  border-radius: 9px; font-size: 13.5px; font-weight: 600;
}
.btn-secondary:hover { border-color: var(--accent); }
.btn-outline {
  border: 1px solid var(--accent); color: var(--accent); background: transparent; padding: 9px 18px; border-radius: 9px; font-weight: 600; font-size: 13.5px;
}
.btn-outline.sm { padding: 7px 14px; font-size: 12.5px; }
.btn-outline-light { border: 1px solid rgba(255,255,255,0.5); color: #fff; padding: 12px 22px; border-radius: 10px; font-weight: 700; }

.results-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
.kw-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 16px; }
.kw-card .kw-term { font-weight: 700; font-size: 15px; margin-bottom: 8px; }
.kw-meta { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 8px; }
.badge { font-size: 11px; font-weight: 700; padding: 3px 9px; border-radius: 999px; text-transform: uppercase; letter-spacing: 0.03em; }
.badge-vol-low { background: rgba(154,167,194,0.15); color: var(--text-muted); }
.badge-vol-medium { background: rgba(255,183,74,0.15); color: var(--warning); }
.badge-vol-high, .badge-vol-veryhigh { background: rgba(37,244,196,0.15); color: var(--success); }
.badge-comp-low { background: rgba(37,244,196,0.15); color: var(--success); }
.badge-comp-medium { background: rgba(255,183,74,0.15); color: var(--warning); }
.badge-comp-high { background: rgba(255,92,108,0.15); color: var(--danger); }
.kw-angle { font-size: 12.5px; color: var(--text-muted); margin: 0; }

.feedback-box { margin-top: 30px; text-align: center; padding: 20px; border: 1px dashed var(--border); border-radius: var(--radius); }
.feedback-box p { margin-bottom: 10px; }

.alert-banner {
  max-width: 1100px; margin: 0 auto 20px; padding: 14px 18px; border-radius: 10px;
  background: rgba(255,92,108,0.12); color: var(--danger); border: 1px solid rgba(255,92,108,0.3); font-size: 14px;
}

/* ================= REF LINKS ================= */
.ref-links { padding: 40px 20px; background: var(--bg-elevated); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.ref-inner { max-width: 1100px; margin: 0 auto; }
.ref-title { font-size: 18px; margin-bottom: 16px; }
.ref-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 10px; }
.ref-grid a { font-size: 13.5px; color: var(--text-muted); padding: 8px 10px; border-radius: 8px; background: var(--bg-card); border: 1px solid var(--border); }
.ref-grid a:hover { color: var(--accent); border-color: var(--accent); }

/* ================= FEATURES ================= */
.features { padding: 60px 20px; }
.features-inner { max-width: 1100px; margin: 0 auto; }
.features h2, .how-inner h2, .faq-inner h2, .seo-content-inner h2 { text-align: center; font-size: clamp(22px, 4vw, 30px); margin-bottom: 36px; }
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }
.feature-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.feature-card h3 { font-size: 16.5px; }
.feature-card p { font-size: 14px; margin: 0; }

/* ================= HOW IT WORKS ================= */
.how-it-works { padding: 60px 20px; background: var(--bg-elevated); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.how-inner { max-width: 1100px; margin: 0 auto; }
.how-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 22px; }
.how-step { text-align: left; }
.how-num {
  display: inline-flex; width: 32px; height: 32px; border-radius: 9px; background: var(--accent-soft); color: var(--accent);
  align-items: center; justify-content: center; font-weight: 800; font-family: var(--font-display); margin-bottom: 12px; font-size: 14px;
}
.how-step h3 { font-size: 15.5px; }
.how-step p { font-size: 13.5px; }

/* ================= SEO CONTENT ================= */
.seo-content { padding: 60px 20px; }
.seo-content-inner { max-width: 780px; margin: 0 auto; }
.seo-content-inner p { font-size: 14.5px; }

/* ================= FAQ ================= */
.faq { padding: 60px 20px; background: var(--bg-elevated); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.faq-inner { max-width: 780px; margin: 0 auto; }
.faq-item { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 16px 18px; margin-bottom: 12px; }
.faq-item summary { cursor: pointer; font-weight: 600; font-size: 15px; list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; float: right; font-size: 18px; color: var(--accent); }
.faq-item[open] summary::after { content: '−'; }
.faq-item p { margin: 12px 0 0; font-size: 14px; }

/* ================= CTA ================= */
.cta { padding: 70px 20px; text-align: center; background: linear-gradient(135deg, #ff2d6d, #7b2ff7); color: #fff; }
.cta-inner { max-width: 700px; margin: 0 auto; }
.cta h2 { font-size: clamp(22px, 4vw, 30px); color: #fff; }
.cta p { color: rgba(255,255,255,0.85); }
.cta-buttons { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-top: 20px; }
.cta .btn-primary { width: auto; background: #fff; color: #ff2d6d; }

/* ================= FOOTER ================= */
.site-footer { padding: 50px 20px 20px; background: var(--bg-elevated); border-top: 1px solid var(--border); }
.footer-inner { max-width: 1280px; margin: 0 auto; display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 26px; }
.footer-col h4 { font-size: 14px; margin-bottom: 12px; }
.footer-col a { display: block; font-size: 13px; color: var(--text-muted); padding: 4px 0; }
.footer-col a:hover { color: var(--accent); }
.footer-about { font-size: 13px; }
.footer-bottom { max-width: 1280px; margin: 30px auto 0; padding-top: 20px; border-top: 1px solid var(--border); font-size: 12px; color: var(--text-muted); }

/* ================= COOKIE BANNER ================= */
.cookie-banner {
  position: fixed; bottom: 16px; left: 16px; right: 16px; z-index: 200; max-width: 620px; margin: 0 auto;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 16px 20px;
  box-shadow: var(--shadow); display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 14px;
}
.cookie-banner p { margin: 0; font-size: 13px; flex: 1; min-width: 200px; }
.cookie-actions { display: flex; gap: 10px; }

/* ================= RESPONSIVE ================= */
@media (max-width: 480px) {
  .header-inner { padding: 12px 14px; }
  .logo-text { display: none; }
  .hero { padding: 40px 14px 30px; }
  .tool-card { padding: 18px; }
  .results-head { flex-direction: column; align-items: flex-start; }
}