/* ==========================================================================
   Keyword Difficulty Score — SEOWebChecker.com
   ========================================================================== */

:root {
  --navy-950: #070b16;
  --navy-900: #0b1120;
  --navy-800: #111a2e;
  --navy-700: #182644;
  --navy-600: #23345a;
  --accent: #4f8dff;
  --accent-2: #7ce0c3;
  --warn: #ffb454;
  --danger: #ff6b6b;
  --text-1: #eef2fb;
  --text-2: #a9b6d1;
  --text-3: #6f7d9c;
  --border: #223154;
  --surface: var(--navy-800);
  --bg: var(--navy-950);
  --font-display: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;
  --radius: 14px;
  --shadow-lg: 0 20px 60px -20px rgba(0,0,0,.6);
}

[data-theme="light"] {
  --bg: #f5f7fc;
  --surface: #ffffff;
  --navy-800: #ffffff;
  --navy-700: #eef1f9;
  --navy-600: #e2e7f5;
  --text-1: #101528;
  --text-2: #454f6b;
  --text-3: #737d99;
  --border: #dde3f3;
  --shadow-lg: 0 20px 60px -20px rgba(30,40,80,.18);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text-1);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background .25s ease, color .25s ease;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { font-family: var(--font-display); margin: 0 0 .5em; letter-spacing: -0.01em; }
p { margin: 0 0 1em; }
.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }

::selection { background: var(--accent); color: #fff; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

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

/* ---------- Cookie banner ---------- */
.cookie-banner {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 500;
  background: var(--navy-800); border-top: 1px solid var(--border);
  padding: 16px 24px; display: none; gap: 16px; align-items: center; justify-content: center;
  flex-wrap: wrap; box-shadow: var(--shadow-lg);
}
.cookie-banner.show { display: flex; }
.cookie-banner p { margin: 0; font-size: .92rem; color: var(--text-2); max-width: 640px; }
.cookie-banner .btns { display: flex; gap: 10px; flex-shrink: 0; }
.btn-cookie { padding: 9px 18px; border-radius: 8px; border: 1px solid var(--border); background: transparent; color: var(--text-1); font-family: var(--font-body); font-size: .88rem; cursor: pointer; }
.btn-cookie.accept { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 400;
  background: color-mix(in srgb, var(--navy-900) 92%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-bar { display: flex; align-items: center; justify-content: space-between; height: 68px; gap: 20px; }
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; color: var(--text-1); flex-shrink: 0; }
.brand .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--accent-2); box-shadow: 0 0 12px var(--accent-2); }

.main-nav { display: none; }
.main-nav ul { display: flex; list-style: none; gap: 4px; margin: 0; padding: 0; }
.main-nav > ul > li { position: relative; }
.main-nav > ul > li > a, .main-nav .nav-toggle-btn {
  display: flex; align-items: center; gap: 4px; padding: 10px 14px; border-radius: 8px;
  font-size: .93rem; color: var(--text-2); font-family: var(--font-body); background: none; border: none; cursor: pointer;
}
.main-nav > ul > li > a:hover, .main-nav .nav-toggle-btn:hover { color: var(--text-1); background: var(--navy-700); }

.mega-panel {
  display: none; position: absolute; top: 100%; left: 0; min-width: 320px; max-width: 420px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow-lg); padding: 14px; margin-top: 8px;
}
.main-nav li:hover .mega-panel, .main-nav li.open .mega-panel { display: block; }
.mega-panel .mega-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; max-height: 340px; overflow-y: auto; }
.mega-panel a { display: block; padding: 8px 10px; border-radius: 6px; font-size: .85rem; color: var(--text-2); }
.mega-panel a:hover { background: var(--navy-700); color: var(--accent); }

.header-actions { display: flex; align-items: center; gap: 10px; }
.theme-toggle {
  width: 40px; height: 40px; border-radius: 10px; border: 1px solid var(--border); background: var(--navy-700);
  color: var(--text-1); cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: 1rem;
  flex-shrink: 0;
}
.hamburger {
  display: flex; width: 40px; height: 40px; border-radius: 10px; border: 1px solid var(--border); background: var(--navy-700);
  align-items: center; justify-content: center; cursor: pointer; flex-direction: column; gap: 4px;
}
.hamburger span { width: 18px; height: 2px; background: var(--text-1); border-radius: 2px; }

.mobile-nav {
  display: none; position: fixed; inset: 68px 0 0 0; background: var(--bg); z-index: 350;
  overflow-y: auto; padding: 20px 24px 100px;
}
.mobile-nav.open { display: block; }
.mobile-nav details { border-bottom: 1px solid var(--border); }
.mobile-nav summary { padding: 14px 0; font-family: var(--font-display); font-weight: 600; cursor: pointer; list-style: none; display: flex; justify-content: space-between; }
.mobile-nav summary::-webkit-details-marker { display: none; }
.mobile-nav a { display: block; padding: 8px 0; color: var(--text-2); font-size: .92rem; }
.mobile-nav > a { display: block; padding: 14px 0; font-family: var(--font-display); font-weight: 600; color: var(--text-1); border-bottom: 1px solid var(--border); }

@media (min-width: 980px) {
  .main-nav { display: block; }
  .hamburger, .mobile-nav { display: none !important; }
}

/* ---------- Breadcrumb ---------- */
.breadcrumb { padding: 14px 0; font-size: .82rem; color: var(--text-3); }
.breadcrumb a { color: var(--text-3); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .sep { margin: 0 6px; }
.breadcrumb .current { color: var(--text-2); }

/* ---------- Hero ---------- */
.hero { padding: 40px 0 60px; position: relative; }
.hero-grid { display: grid; grid-template-columns: 1fr; gap: 40px; align-items: center; }
@media (min-width: 960px) { .hero-grid { grid-template-columns: 1.1fr 0.9fr; } }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: .78rem; letter-spacing: .06em; text-transform: uppercase; color: var(--accent-2); background: color-mix(in srgb, var(--accent-2) 12%, transparent); padding: 6px 12px; border-radius: 100px; margin-bottom: 16px; }
.hero h1 { font-size: clamp(2rem, 4.4vw, 3.1rem); line-height: 1.08; }
.hero h1 .grad { background: linear-gradient(90deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.lead { font-size: 1.08rem; color: var(--text-2); max-width: 540px; }
.hero-stats { display: flex; gap: 28px; margin-top: 28px; flex-wrap: wrap; }
.hero-stats div strong { font-family: var(--font-display); font-size: 1.5rem; display: block; }
.hero-stats div span { font-size: .8rem; color: var(--text-3); }

/* Signature gauge visual */
.gauge-card { background: var(--surface); border: 1px solid var(--border); border-radius: 20px; padding: 28px; box-shadow: var(--shadow-lg); }
.gauge-wrap { position: relative; width: 100%; max-width: 300px; margin: 0 auto; }
.gauge-label { text-align: center; margin-top: 10px; }
.gauge-label .val { font-family: var(--font-display); font-size: 2.4rem; font-weight: 700; }
.gauge-label .tag { font-size: .82rem; color: var(--text-3); }
.gauge-demo-kw { text-align: center; font-size: .85rem; color: var(--text-2); margin-top: 6px; font-family: 'Inter', monospace; }

/* ---------- Tool section ---------- */
.tool-section { padding: 20px 0 70px; }
.tool-card { background: var(--surface); border: 1px solid var(--border); border-radius: 20px; padding: 28px; box-shadow: var(--shadow-lg); }
.tool-tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 22px; border-bottom: 1px solid var(--border); padding-bottom: 12px; }
.tool-tab { padding: 9px 16px; border-radius: 8px; border: 1px solid transparent; background: none; color: var(--text-2); font-family: var(--font-body); font-size: .88rem; cursor: pointer; }
.tool-tab.active { background: var(--navy-700); color: var(--accent-2); border-color: var(--border); }
.tool-panel { display: none; }
.tool-panel.active { display: block; }

.field-row { display: grid; grid-template-columns: 1fr; gap: 16px; margin-bottom: 16px; }
@media (min-width: 700px) { .field-row.cols-3 { grid-template-columns: 1fr 1fr 1fr; } .field-row.cols-2 { grid-template-columns: 1fr 1fr; } }
.field label { display: block; font-size: .82rem; color: var(--text-2); margin-bottom: 6px; font-weight: 500; }
.field textarea, .field input[type="text"], .field input[type="url"], .field select {
  width: 100%; background: var(--navy-700); border: 1px solid var(--border); border-radius: 10px;
  padding: 12px 14px; color: var(--text-1); font-family: var(--font-body); font-size: .93rem;
}
.field textarea { min-height: 120px; resize: vertical; }
.field small.hint { display: block; margin-top: 6px; color: var(--text-3); font-size: .78rem; }
.field small.error { display: none; margin-top: 6px; color: var(--danger); font-size: .78rem; }
.field.has-error textarea, .field.has-error input { border-color: var(--danger); }
.field.has-error small.error { display: block; }

.select-wrap { position: relative; }
.select-wrap::after { content: '▾'; position: absolute; right: 14px; top: 50%; transform: translateY(-50%); color: var(--text-3); pointer-events: none; }
.select-wrap select { appearance: none; -webkit-appearance: none; }

.options-row { display: flex; flex-wrap: wrap; gap: 12px; margin: 16px 0; }
.check-pill { display: flex; align-items: center; gap: 8px; background: var(--navy-700); border: 1px solid var(--border); border-radius: 100px; padding: 8px 14px; font-size: .85rem; color: var(--text-2); cursor: pointer; }
.check-pill input { accent-color: var(--accent); }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #3563d6); color: #fff; border: none; border-radius: 12px;
  padding: 14px 28px; font-family: var(--font-display); font-weight: 600; font-size: 1rem; cursor: pointer;
  display: inline-flex; align-items: center; gap: 10px; transition: transform .15s ease, box-shadow .15s ease;
  box-shadow: 0 10px 30px -10px color-mix(in srgb, var(--accent) 60%, transparent);
}
.btn-primary:hover:not(:disabled) { transform: translateY(-2px); }
.btn-primary:disabled { opacity: .6; cursor: not-allowed; transform: none; }
.btn-secondary {
  background: var(--navy-700); border: 1px solid var(--border); color: var(--text-1); border-radius: 10px;
  padding: 10px 18px; font-family: var(--font-body); font-size: .88rem; cursor: pointer; display: inline-flex; align-items: center; gap: 8px;
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

.spinner { width: 16px; height: 16px; border: 2px solid rgba(255,255,255,.4); border-top-color: #fff; border-radius: 50%; animation: spin .7s linear infinite; display: none; }
.spinner.show { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Results ---------- */
#results-section { margin-top: 40px; scroll-margin-top: 90px; display: none; }
#results-section.show { display: block; }
.results-header { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; margin-bottom: 18px; }
.results-actions { display: flex; gap: 10px; flex-wrap: wrap; }

.result-table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: 14px; }
table.kd-table { width: 100%; border-collapse: collapse; font-size: .88rem; min-width: 640px; }
table.kd-table th { text-align: left; padding: 12px 14px; background: var(--navy-700); color: var(--text-2); font-weight: 600; font-size: .78rem; text-transform: uppercase; letter-spacing: .04em; white-space: nowrap; }
table.kd-table td { padding: 12px 14px; border-top: 1px solid var(--border); vertical-align: middle; }
table.kd-table tr:hover td { background: color-mix(in srgb, var(--navy-700) 50%, transparent); }
.kd-score-pill { display: inline-flex; align-items: center; gap: 8px; font-family: var(--font-display); font-weight: 700; padding: 4px 10px; border-radius: 8px; }
.kd-vez { background: color-mix(in srgb, var(--accent-2) 20%, transparent); color: var(--accent-2); }
.kd-ez  { background: color-mix(in srgb, #7ce0c3 15%, transparent); color: #7ce0c3; }
.kd-md  { background: color-mix(in srgb, var(--warn) 20%, transparent); color: var(--warn); }
.kd-hd  { background: color-mix(in srgb, #ff9d6b 20%, transparent); color: #ff9d6b; }
.kd-vhd { background: color-mix(in srgb, var(--danger) 20%, transparent); color: var(--danger); }
.driver-text { color: var(--text-3); font-size: .82rem; max-width: 280px; }
.error-banner { background: color-mix(in srgb, var(--danger) 12%, transparent); border: 1px solid var(--danger); color: var(--danger); padding: 14px 16px; border-radius: 10px; margin-bottom: 16px; font-size: .88rem; }

/* ---------- Random tools strip ---------- */
.strip-section { padding: 50px 0; border-top: 1px solid var(--border); }
.strip-scroller { display: flex; gap: 12px; overflow-x: auto; padding-bottom: 8px; scrollbar-width: thin; }
.strip-chip { flex-shrink: 0; background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 10px 16px; font-size: .84rem; color: var(--text-2); white-space: nowrap; }
.strip-chip:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- Section generic ---------- */
.section { padding: 70px 0; }
.section-head { text-align: center; max-width: 620px; margin: 0 auto 42px; }
.section-head h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
.section-head p { color: var(--text-2); }

/* ---------- Features ---------- */
.feature-grid { display: grid; grid-template-columns: 1fr; gap: 20px; }
@media (min-width: 700px) { .feature-grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1000px) { .feature-grid { grid-template-columns: repeat(3, 1fr); } }
.feature-card { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 24px; }
.feature-card .icon { width: 42px; height: 42px; border-radius: 10px; background: color-mix(in srgb, var(--accent) 15%, transparent); display: flex; align-items: center; justify-content: center; font-size: 1.2rem; margin-bottom: 14px; }
.feature-card h3 { font-size: 1.05rem; }
.feature-card p { color: var(--text-2); font-size: .9rem; margin: 0; }

/* ---------- How it works ---------- */
.steps { display: grid; grid-template-columns: 1fr; gap: 24px; }
@media (min-width: 800px) { .steps { grid-template-columns: repeat(4, 1fr); } }
.step { position: relative; padding-top: 16px; }
.step .num { font-family: var(--font-display); font-size: .78rem; color: var(--accent-2); letter-spacing: .1em; }
.step h3 { font-size: 1.02rem; margin-top: 6px; }
.step p { color: var(--text-2); font-size: .88rem; margin: 0; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 760px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-item summary { padding: 18px 4px; cursor: pointer; font-family: var(--font-display); font-weight: 600; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; font-size: 1.3rem; color: var(--text-3); transition: transform .2s ease; }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p { padding: 0 4px 18px; color: var(--text-2); font-size: .92rem; }

/* ---------- Article ---------- */
.article-block { max-width: 780px; margin: 0 auto; color: var(--text-2); font-size: .95rem; }
.article-block h2 { color: var(--text-1); }

/* ---------- CTA ---------- */
.cta-section { background: linear-gradient(135deg, var(--navy-700), var(--navy-800)); border-radius: 24px; margin: 0 24px; padding: 50px 30px; text-align: center; }
.cta-section h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
.cta-section p { color: var(--text-2); max-width: 520px; margin: 0 auto 26px; }
.cta-buttons { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--border); padding: 50px 0 24px; margin-top: 60px; }
.footer-grid { display: grid; grid-template-columns: 1fr; gap: 28px; }
@media (min-width: 700px) { .footer-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1000px) { .footer-grid { grid-template-columns: repeat(5, 1fr); } }
.footer-col h4 { font-size: .82rem; text-transform: uppercase; letter-spacing: .06em; color: var(--text-3); margin-bottom: 14px; }
.footer-col a { display: block; padding: 5px 0; font-size: .86rem; color: var(--text-2); }
.footer-col a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid var(--border); margin-top: 36px; padding-top: 22px; display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; align-items: center; font-size: .82rem; color: var(--text-3); }
.footer-bottom a { color: var(--text-3); }
.footer-legal { max-width: 780px; margin: 18px auto 0; text-align: center; font-size: .76rem; color: var(--text-3); }

/* ---------- Utilities ---------- */
.lazy-img { background: var(--navy-700); }