/* =============================================================
   1. Tokens
   ============================================================= */
:root {
  --bg: #0f1115;
  --bg-elev: #161923;
  --card: #1b1f2a;
  --border: rgba(255,255,255,0.08);
  --text: #eef0f4;
  --text-dim: #a4aabb;
  --accent: #5b8cff;
  --accent-2: #7ee8c9;
  --danger: #ff6b6b;
  --warn: #ffb35c;
  --good: #7ee8c9;
  --radius: 14px;
  --radius-sm: 9px;
  --gutter: clamp(1.1rem, 4vw, 2.4rem);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --shadow: 0 10px 30px -12px rgba(0,0,0,0.5);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f7fb;
    --bg-elev: #ffffff;
    --card: #ffffff;
    --border: rgba(15,17,21,0.08);
    --text: #14161c;
    --text-dim: #565d70;
    --accent: #3a63d8;
    --accent-2: #0e9c78;
    --shadow: 0 10px 30px -14px rgba(20,22,28,0.18);
  }
}

/* =============================================================
   2. Reset & base
   ============================================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; }
html { -webkit-text-size-adjust: 100%; tab-size: 2; overflow-x: clip; scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
  overscroll-behavior-y: none;
}
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
a { color: inherit; text-decoration: none; }
p { text-wrap: pretty; }
h1, h2, h3, h4 { text-wrap: balance; line-height: 1.1; letter-spacing: -0.01em; }
::selection { background: var(--accent); color: #fff; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

/* =============================================================
   3. Utilities
   ============================================================= */
.container { max-width: 920px; margin-inline: auto; padding-inline: var(--gutter); }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-link {
  position: fixed; top: -100px; left: 1rem;
  padding: .6rem 1rem; background: var(--accent); color: #fff;
  z-index: 9999; border-radius: 8px; font-weight: 600;
  transition: top .2s var(--ease-out);
}
.skip-link:focus { top: 1rem; }

/* =============================================================
   4. Typography
   ============================================================= */
.h1 { font-size: clamp(1.9rem, 5vw, 2.7rem); }
.subtitle { color: var(--text-dim); font-size: clamp(1rem, 2vw, 1.15rem); margin-top: .6rem; max-width: 60ch; }
.section-title { font-size: clamp(1.3rem, 3vw, 1.6rem); margin-bottom: 1rem; }

/* =============================================================
   5. Components
   ============================================================= */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .85rem 1.4rem; border-radius: var(--radius-sm);
  background: var(--accent); color: #fff; font-weight: 600; font-size: .98rem;
  transition: transform .18s var(--ease-out), filter .18s var(--ease-out);
}
.btn:hover { filter: brightness(1.08); }
.btn:active { transform: scale(0.98); }
.btn.secondary { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn.small { padding: .55rem .9rem; font-size: .88rem; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.badge {
  display: inline-flex; align-items: center; gap: .45rem;
  font-size: .85rem; color: var(--text-dim);
  padding: .5rem .8rem; border-radius: 999px; border: 1px solid var(--border);
  background: var(--bg-elev);
}

.copy-btn {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .5rem .8rem; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--bg-elev); font-size: .88rem; font-weight: 600;
  transition: background .15s var(--ease-out);
}
.copy-btn:hover { background: var(--card); }
.copy-btn.is-copied { color: var(--good); border-color: var(--good); }

/* =============================================================
   6. Sections — header / hero / footer
   ============================================================= */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; padding-block: .9rem; }
.logo { font-weight: 800; font-size: 1.2rem; display: flex; align-items: center; gap: .5rem; }
.logo .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--accent); }
.nav-link { font-weight: 600; font-size: .95rem; color: var(--text-dim); }
.nav-link:hover { color: var(--text); }

.hero { padding-block: clamp(1.6rem, 5vw, 3rem) 1.2rem; }

.site-footer {
  border-top: 1px solid var(--border); margin-top: clamp(2.5rem, 6vw, 4rem);
  padding-block: 2rem; color: var(--text-dim); font-size: .9rem;
}
.site-footer .container { display: flex; flex-wrap: wrap; gap: .8rem 1.4rem; align-items: center; justify-content: space-between; }
.footer-links { display: flex; gap: 1.1rem; flex-wrap: wrap; }
.footer-links a:hover { color: var(--text); }

/* =============================================================
   7. Tool card shell
   ============================================================= */
.tool-card {
  padding: clamp(1.2rem, 4vw, 2rem);
  margin-top: 1.2rem;
}
.tool-card[data-state="error"] .tool-error { display: flex; }
.tool-error {
  display: none; gap: .6rem; align-items: flex-start;
  background: color-mix(in srgb, var(--danger) 12%, var(--card));
  border: 1px solid color-mix(in srgb, var(--danger) 40%, var(--border));
  color: var(--text); padding: .9rem 1rem; border-radius: var(--radius-sm);
  font-size: .92rem; margin-top: .8rem;
}

.privacy-badge {
  display: flex; align-items: center; gap: .55rem; margin-top: 1rem;
  font-size: .88rem; color: var(--text-dim);
}
.privacy-badge svg { flex: none; width: 18px; height: 18px; color: var(--good); }

.limits-note { font-size: .82rem; color: var(--text-dim); margin-top: .4rem; }

/* Ad slots — reserved placeholders, never above the fold content */
.ad-slot {
  margin-block: 1.6rem;
  min-height: 90px;
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-dim); font-size: .8rem; letter-spacing: .04em; text-transform: uppercase;
}

/* Steps */
.steps { display: grid; gap: 1rem; grid-template-columns: 1fr; margin-block: 1rem; }
.step { display: flex; gap: .9rem; align-items: flex-start; }
.step-num {
  flex: none; width: 30px; height: 30px; border-radius: 50%;
  background: var(--bg-elev); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: .9rem;
}
.step p { color: var(--text-dim); font-size: .95rem; }
.step strong { display: block; margin-bottom: .15rem; }

/* SEO copy block */
.seo-copy { color: var(--text-dim); font-size: .98rem; }
.seo-copy p + p { margin-top: .9rem; }
.seo-copy h2, .seo-copy h3 { color: var(--text); margin-top: 1.4rem; margin-bottom: .5rem; }

/* FAQ */
.faq details {
  border-bottom: 1px solid var(--border); padding-block: .9rem;
}
.faq summary {
  cursor: pointer; font-weight: 600; list-style: none; display: flex;
  justify-content: space-between; align-items: center; gap: 1rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 1.3rem; color: var(--text-dim); transition: transform .2s var(--ease-out); }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq p { color: var(--text-dim); margin-top: .6rem; font-size: .95rem; }

/* More tools */
.more-tools-grid { display: grid; gap: 1rem; grid-template-columns: 1fr; margin-top: 1rem; }
.tool-mini-card {
  padding: 1.1rem; display: flex; flex-direction: column; gap: .3rem;
  transition: transform .18s var(--ease-out), border-color .18s var(--ease-out);
}
.tool-mini-card:hover { transform: translateY(-3px); border-color: var(--accent); }
.tool-mini-card strong { font-size: 1.02rem; }
.tool-mini-card span { color: var(--text-dim); font-size: .88rem; }

/* Hub index landing */
.tool-grid { display: grid; gap: 1.1rem; grid-template-columns: 1fr; margin-top: 1.6rem; }
.tool-grid .tool-mini-card { padding: 1.4rem; }
.tool-icon { width: 38px; height: 38px; color: var(--accent); margin-bottom: .5rem; }

/* Form controls */
.field { display: flex; flex-direction: column; gap: .4rem; margin-bottom: 1rem; }
.field label { font-size: .88rem; font-weight: 600; color: var(--text-dim); }
input[type="text"], input[type="number"], select {
  background: var(--bg-elev); border: 1px solid var(--border); color: var(--text);
  border-radius: var(--radius-sm); padding: .7rem .85rem; font-size: 1rem; width: 100%;
}
input[type="range"] { width: 100%; accent-color: var(--accent); }
.checkbox-row { display: flex; flex-wrap: wrap; gap: .6rem; }
.checkbox-pill {
  display: flex; align-items: center; gap: .45rem;
  border: 1px solid var(--border); border-radius: 999px; padding: .5rem .9rem;
  font-size: .9rem; cursor: pointer; user-select: none;
}
.checkbox-pill input { accent-color: var(--accent); }

/* Result / output boxes */
.output-box {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: .9rem 1rem; margin-top: .8rem; word-break: break-all;
}
.output-box strong { font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, monospace; font-size: 1.05rem; }

.strength-meter { height: 8px; border-radius: 999px; background: var(--bg-elev); overflow: hidden; margin-top: .6rem; }
.strength-meter > span { display: block; height: 100%; border-radius: 999px; transition: width .25s var(--ease-out), background .25s var(--ease-out); }
.strength-label { font-size: .85rem; margin-top: .4rem; color: var(--text-dim); }

/* IP page specifics */
.ip-display { display: flex; flex-direction: column; align-items: flex-start; gap: .4rem; }
.ip-number { font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, monospace; font-size: clamp(1.6rem, 6vw, 2.4rem); font-weight: 700; letter-spacing: -.02em; }
.ip-meta-grid { display: grid; grid-template-columns: 1fr; gap: .7rem; margin-top: 1rem; }
.ip-meta-item { display: flex; justify-content: space-between; gap: 1rem; padding-block: .5rem; border-bottom: 1px solid var(--border); font-size: .92rem; }
.ip-meta-item span:first-child { color: var(--text-dim); }

/* Speed test gauge */
.gauge-wrap { display: flex; flex-direction: column; align-items: center; gap: .8rem; padding-block: .8rem; }
.gauge-value { font-size: clamp(2.2rem, 8vw, 3.2rem); font-weight: 800; font-variant-numeric: tabular-nums; }
.gauge-unit { font-size: 1rem; color: var(--text-dim); font-weight: 600; }
.gauge-phase { color: var(--text-dim); font-size: .95rem; min-height: 1.2em; }
.speed-results { display: grid; grid-template-columns: repeat(3, 1fr); gap: .8rem; margin-top: 1rem; }
.speed-result-item { text-align: center; padding: .9rem .5rem; background: var(--bg-elev); border-radius: var(--radius-sm); border: 1px solid var(--border); }
.speed-result-item strong { display: block; font-size: 1.3rem; }
.speed-result-item span { font-size: .78rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: .04em; }
.history-list { margin-top: 1rem; font-size: .88rem; color: var(--text-dim); }
.history-list li { display: flex; justify-content: space-between; padding-block: .35rem; border-bottom: 1px solid var(--border); }

/* =============================================================
   8. Responsive
   ============================================================= */
@media (min-width: 640px) {
  .steps { grid-template-columns: repeat(3, 1fr); }
  .more-tools-grid { grid-template-columns: repeat(2, 1fr); }
  .tool-grid { grid-template-columns: repeat(3, 1fr); }
  .ip-meta-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .more-tools-grid { grid-template-columns: repeat(3, 1fr); }
}

/* =============================================================
   9. Reduced motion — only intrusive effects
   ============================================================= */
@media (prefers-reduced-motion: reduce) {
  .gauge-needle { transition: none !important; }
}