/* ==========================================================================
   SpeedPulse — styles.css
   Design system + layout + components. No frameworks, no build step.

   Table of contents
   -----------------
   01. Tokens (theme variables, dark + light)
   02. Reset & base
   03. Utilities (container, sr-only, skip link)
   04. Buttons & controls
   05. Header / brand / unit toggle
   06. Hero & stepper
   07. Test card & gauge
   08. Graph
   09. Alert
   10. Results (verdict, metrics, info card)
   11. History
   12. How it works & FAQ
   13. Footer
   14. Responsive
   15. Motion & accessibility
   ========================================================================== */

/* Self-hosted variable fonts, subset to the characters this site uses.
   See tools/build_fonts.py. One file per family covers every weight. */
@font-face {
font-family: 'Inter'; font-style: normal; font-weight: 100 900; font-display: swap; src: url('./fonts/speedpulse-sans.woff2') format('woff2'); }
@font-face {
font-family: 'Outfit'; font-style: normal; font-weight: 100 900; font-display: swap; src: url('./fonts/speedpulse-display.woff2') format('woff2'); }

:root {
/* --- Brand ------------------------------------------------------------
   Change the brand name in index.html (data-brand) and the gradient stops
   below to re-brand the whole app. */
--brand-gradient: linear-gradient(120deg, var(--c-cyan) 0%, var(--c-blue) 50%, var(--c-violet) 100%);
/* --- Metric colours (consistent across gauge, graph, labels) ---------- */
--c-cyan: #22d3ee; --c-blue: #3b82f6; --c-violet: #a855f7;
--c-amber: #fbbf24; --c-green: #34d399; --c-rose: #fb7185;
--c-download: var(--c-cyan); --c-upload: var(--c-violet);
--c-ping: var(--c-amber); --c-jitter: var(--c-green);
/* --- Radii ----------------------------------------------------------- */
--r-xs: 8px; --r-sm: 12px; --r-md: 16px; --r-lg: 22px; --r-xl: 28px; --r-pill: 999px;
/* --- Spacing --------------------------------------------------------- */
--sp-1: 4px; --sp-2: 8px; --sp-3: 12px; --sp-4: 16px; --sp-5: 24px;
--sp-6: 32px; --sp-7: 48px; --sp-8: 64px; --sp-9: 96px;
/* --- Typography ------------------------------------------------------ */
--font-display: 'Outfit', 'Segoe UI', system-ui, -apple-system, sans-serif;
--font-ui: 'Inter', 'Segoe UI', system-ui, -apple-system, 'Helvetica Neue', Arial, sans-serif;
/* --- Motion ---------------------------------------------------------- */
--ease-out: cubic-bezier(0.16, 1, 0.3, 1); --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
--dur-fast: 140ms; --dur-med: 260ms; --dur-slow: 480ms;
/* --- Layout ---------------------------------------------------------- */
--container: 1120px; --container-narrow: 780px; --header-h: 68px; }

/* ---- Dark theme (default) ---------------------------------------------- */
[data-theme='dark'] {
/* --- Surfaces ---------------------------------------------------------- */
--bg: #070b16; --bg-2: #0b1020;
--surface: rgba(255, 255, 255, 0.04); --surface-solid: #111830; --surface-2: rgba(255, 255, 255, 0.07);
--surface-hover: rgba(255, 255, 255, 0.10);
--border: rgba(255, 255, 255, 0.08); --border-strong: rgba(255, 255, 255, 0.16);
/* --- Text --------------------------------------------------------------
   --text-3 is the dimmest tone and is only used for genuinely secondary
   labels. It is tuned to clear WCAG AA (4.5:1) on both themes. */
--text: #f2f5fc; --text-2: #a9b4cb; --text-3: #808da6;
/* --- Shadows & effects ------------------------------------------------- */
--shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
--shadow-md: 0 16px 40px -20px rgba(0, 0, 0, 0.75);
--shadow-lg: 0 32px 70px -30px rgba(0, 0, 0, 0.85);
--shadow-accent: 0 12px 32px -14px rgba(124, 92, 255, 0.75);
--glass-blur: 20px; --glow: 0 0 70px -14px rgba(124, 92, 255, 0.55);
/* --- Focus ------------------------------------------------------------- */
--focus: var(--c-cyan); --shadow-1: 0 0 0 3px rgba(34, 211, 238, 0.45); }

/* ---- Light theme -------------------------------------------------------- */
[data-theme='light'] {
/* --- Surfaces ---------------------------------------------------------- */
--bg: #f4f6fb; --bg-2: #ffffff;
--surface: rgba(255, 255, 255, 0.92); --surface-solid: #ffffff; --surface-2: rgba(15, 23, 42, 0.035);
--surface-hover: rgba(15, 23, 42, 0.055);
--border: rgba(15, 23, 42, 0.09); --border-strong: rgba(15, 23, 42, 0.16);
/* --- Text --------------------------------------------------------------
   --text-3 is the dimmest tone and is only used for genuinely secondary
   labels. It is tuned to clear WCAG AA (4.5:1) on both themes. */
--text: #0c1322; --text-2: #4a5466; --text-3: #626c80;
/* --- Shadows & effects ------------------------------------------------- */
--shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
--shadow-md: 0 18px 40px -22px rgba(15, 23, 42, 0.22);
--shadow-lg: 0 30px 60px -32px rgba(15, 23, 42, 0.28);
--shadow-accent: 0 12px 30px -14px rgba(99, 102, 241, 0.55);
--glass-blur: 16px; --glow: 0 0 60px -16px rgba(99, 102, 241, 0.28);
/* --- Focus ------------------------------------------------------------- */
--focus: #4f46e5; --shadow-1: 0 0 0 3px rgba(79, 70, 229, 0.35);
/* --- Metric colours, deepened so they stay AA on white ---------------- */
--c-cyan: #0e8fae; --c-blue: #2563eb; --c-violet: #7c3aed;
--c-amber: #b45309; --c-green: #047857; --c-rose: #be123c; }

/* ==========================================================================
   02. RESET & BASE
   ========================================================================== */

*,
*::before,
*::after {
box-sizing: border-box; }
html {
-webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 16px); }
body {
margin: 0; min-height: 100dvh; background: var(--bg); color: var(--text); font-family: var(--font-ui); font-size: 16px; line-height: 1.6; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; overflow-x: hidden; transition: background-color var(--dur-med) var(--ease-out), color var(--dur-med) var(--ease-out); }
h1, h2, h3, h4 {
font-family: var(--font-display); font-weight: 600; line-height: 1.15; letter-spacing: -0.025em; margin: 0; text-wrap: balance; }
p {
margin: 0; text-wrap: pretty; }
a {
color: var(--text); text-decoration-color: var(--border-strong); text-underline-offset: 3px; transition: color var(--dur-fast) var(--ease-out), text-decoration-color var(--dur-fast) var(--ease-out); }
a:hover {
color: var(--c-cyan); text-decoration-color: var(--c-cyan); }
button {
font: inherit; color: inherit; }
svg {
display: block; }
.svg-sprite {
position: absolute; width: 0; height: 0; overflow: hidden; }
::selection {
background: color-mix(in srgb, var(--c-violet) 35%, transparent); }
:focus-visible {
outline: 2px solid var(--focus); outline-offset: 3px; border-radius: 6px; }

/* Ambient gradient wash behind the whole page. */
.bg-gradient {
position: fixed; inset: 0; z-index: -1; pointer-events: none; background:
radial-gradient(58rem 38rem at 14% -10%, color-mix(in srgb, var(--c-cyan) 16%, transparent), transparent 62%),
radial-gradient(50rem 36rem at 86% 2%, color-mix(in srgb, var(--c-violet) 18%, transparent), transparent 64%),
radial-gradient(46rem 32rem at 50% 106%, color-mix(in srgb, var(--c-blue) 12%, transparent), transparent 62%); }

/* ==========================================================================
   03. UTILITIES
   ========================================================================== */

.container {
width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: clamp(16px, 4vw, 32px); }
.container-narrow {
max-width: var(--container-narrow); }
.sr-only {
position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap; border: 0; left: 0; top: 0; }
.skip-link {
position: absolute; top: 8px; left: 8px; z-index: 100; padding: 10px 16px; background: var(--surface-solid); border: 1px solid var(--border-strong); border-radius: var(--r-sm); text-decoration: none; box-shadow: var(--shadow-md); transform: translateY(-160%); transition: transform var(--dur-fast) var(--ease-out); }
.skip-link:focus {
transform: translateY(0); }
.card {
background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg); box-shadow: var(--shadow-md); backdrop-filter: blur(var(--glass-blur)) saturate(150%); -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(150%); }
.section {
padding-block: clamp(52px, 8vw, 92px); }
.section-head {
margin-bottom: var(--sp-6); }
.section-head h2 {
font-size: clamp(1.6rem, 3.4vw, 2.15rem); }
.section-sub {
color: var(--text-2); margin-top: var(--sp-2); font-size: 0.975rem; }

/* ==========================================================================
   04. BUTTONS & CONTROLS
   ========================================================================== */

.btn {
--btn-bg: var(--surface-2); --btn-fg: var(--text); --btn-border: var(--border); display: inline-flex; align-items: center; justify-content: center; gap: var(--sp-2); min-height: 44px; padding: 0 22px; border: 1px solid var(--btn-border); border-radius: var(--r-pill); background: var(--btn-bg); color: var(--btn-fg); font-weight: 600; font-size: 0.95rem; letter-spacing: -0.01em; cursor: pointer; text-decoration: none; white-space: nowrap; transition: transform var(--dur-fast) var(--ease-out),
box-shadow var(--dur-fast) var(--ease-out),
background-color var(--dur-fast) var(--ease-out),
border-color var(--dur-fast) var(--ease-out),
color var(--dur-fast) var(--ease-out),
opacity var(--dur-fast) var(--ease-out); }
.btn:hover {
transform: translateY(-1px); }
.btn:active {
transform: translateY(0) scale(0.985); }
.btn:disabled {
opacity: 0.55; cursor: not-allowed; transform: none; }
.btn-icon {
width: 18px; height: 18px; flex: none; }
.btn-primary {
--btn-bg: var(--brand-gradient); --btn-fg: #050914; --btn-border: transparent; box-shadow: var(--shadow-accent); }
.btn-primary:hover {
box-shadow: 0 18px 38px -14px rgba(124, 92, 255, 0.95); }
[data-theme='light'] .btn-primary {
--btn-fg: #ffffff; }
.btn-outline {
--btn-bg: transparent; --btn-border: var(--border-strong); }
.btn-outline:hover {
--btn-bg: var(--surface-2); --btn-border: var(--c-cyan); }
.btn-ghost {
--btn-bg: transparent; --btn-border: var(--border); --btn-fg: var(--text-2); }
.btn-ghost:hover {
--btn-fg: var(--text); --btn-border: var(--border-strong); --btn-bg: var(--surface-2); }
.btn-small {
min-height: 38px; padding: 0 16px; font-size: 0.86rem; }

/* Big GO button */
.btn-go {
min-height: 60px; padding: 0 36px; font-size: 1.05rem; gap: var(--sp-3); letter-spacing: -0.02em; }
.btn-go-icon {
display: grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: rgba(0, 0, 0, 0.18); }
.btn-go-icon svg {
width: 18px; height: 18px; }
[data-theme='light'] .btn-go-icon {
background: rgba(255, 255, 255, 0.24); }
.btn-go.is-running {
pointer-events: none; opacity: 0; transform: scale(0.9); }

/* Icon-only button (theme toggle) */
.icon-btn {
display: grid; place-items: center; width: 44px; height: 44px; border: 1px solid var(--border); border-radius: var(--r-pill); background: var(--surface); color: var(--text-2); cursor: pointer; transition: color var(--dur-fast) var(--ease-out),
background-color var(--dur-fast) var(--ease-out),
border-color var(--dur-fast) var(--ease-out),
transform var(--dur-fast) var(--ease-out); }
.icon-btn:hover {
color: var(--text); border-color: var(--border-strong); background: var(--surface-2); transform: translateY(-1px); }
.icon-btn svg {
width: 19px; height: 19px; }
.icon-btn .icon-moon {
display: none; }
[data-theme='light'] .icon-btn .icon-sun {
display: none; }
[data-theme='light'] .icon-btn .icon-moon {
display: block; }

/* ==========================================================================
   05. HEADER
   ========================================================================== */

.site-header {
position: sticky; top: 0; z-index: 40; height: var(--header-h); display: flex; align-items: center; background: color-mix(in srgb, var(--bg) 72%, transparent); border-bottom: 1px solid transparent; backdrop-filter: blur(18px) saturate(160%); -webkit-backdrop-filter: blur(18px) saturate(160%); transition: border-color var(--dur-med) var(--ease-out), background-color var(--dur-med) var(--ease-out); }
.site-header.is-scrolled {
border-bottom-color: var(--border); background: color-mix(in srgb, var(--bg) 85%, transparent); }
.header-inner {
display: flex; align-items: center; gap: var(--sp-5); }
.brand {
display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); flex: none; }
.brand-mark {
width: 30px; height: 30px; }
.brand-name {
font-family: var(--font-display); font-weight: 700; font-size: 1.2rem; letter-spacing: -0.035em; }
.header-nav {
display: flex; gap: var(--sp-2); margin-inline-start: auto; font-size: 0.925rem; font-weight: 500; }
/* The padding gives the links a 44px tap target without changing the
   visual rhythm of the header. */
.header-nav a {
display: inline-flex; align-items: center; min-height: 44px; padding-inline: 12px; border-radius: var(--r-sm); color: var(--text-2); text-decoration: none; transition: color var(--dur-fast) var(--ease-out), background-color var(--dur-fast) var(--ease-out); }
.header-nav a:hover {
color: var(--text); background: var(--surface-2); }
/* The portfolio link is the way back to the parent site, so it reads as an
   external destination rather than an in-page section jump. */
.header-portfolio-link {
color: var(--text) !important; font-weight: 600; }
.header-portfolio-link::after {
content: ''; display: inline-block; width: 6px; height: 6px; margin-left: 7px; border-top: 1.5px solid currentColor; border-right: 1.5px solid currentColor; transform: rotate(45deg) translateY(-1px); }
.header-actions {
display: flex; align-items: center; gap: var(--sp-3); flex: none; }

/* Unit toggle (segmented control with sliding indicator) */
.unit-toggle {
position: relative; display: inline-flex; padding: 3px; border: 1px solid var(--border); border-radius: var(--r-pill); background: var(--surface-2); isolation: isolate; }
.unit-btn {
position: relative; z-index: 2; min-height: 34px; padding: 0 14px; border: 0; border-radius: var(--r-pill); background: transparent; color: var(--text-3); font-size: 0.82rem; font-weight: 600; cursor: pointer; transition: color var(--dur-med) var(--ease-out); }
.unit-btn.is-active {
color: var(--text); }
.unit-slider {
position: absolute; z-index: 1; top: 3px; bottom: 3px; left: 3px; width: calc(50% - 3px); border-radius: var(--r-pill); background: var(--surface-solid); border: 1px solid var(--border); box-shadow: var(--shadow-sm); transition: transform var(--dur-med) var(--ease-out); }
.unit-toggle.is-mbs .unit-slider {
transform: translateX(100%); }

/* ==========================================================================
   06. HERO & STEPPER
   ========================================================================== */

.hero {
padding-block: clamp(40px, 6vw, 76px) clamp(24px, 4vw, 44px); text-align: center; }
.hero-intro {
max-width: 620px; margin-inline: auto; }
.eyebrow {
display: inline-flex; align-items: center; gap: 8px; padding: 6px 15px 6px 12px; margin-bottom: var(--sp-5); border: 1px solid var(--border); border-radius: var(--r-pill); background: var(--surface); color: var(--text-2); font-size: 0.76rem; font-weight: 600; letter-spacing: 0.05em; text-transform: uppercase; }
.eyebrow::before {
content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--c-green); box-shadow: 0 0 0 3px color-mix(in srgb, var(--c-green) 22%, transparent); }
.hero h1 {
font-size: clamp(2.1rem, 6.4vw, 3.7rem); font-weight: 700; letter-spacing: -0.04em; }
.hero h1::after {
content: ''; display: block; height: 3px; width: 72px; margin: var(--sp-5) auto 0; border-radius: var(--r-pill); background: var(--brand-gradient); opacity: 0.9; }
.lede {
margin-top: var(--sp-4); color: var(--text-2); font-size: clamp(1rem, 2.2vw, 1.1rem); line-height: 1.65; }

/* ---- Phase stepper -----------------------------------------------------
   A segmented progress bar: each step is a pill that fills as the test
   advances. The connecting line is drawn with a ::before pseudo-element. */
.stepper {
display: flex; justify-content: center; align-items: center; gap: 0; list-style: none; margin: clamp(26px, 4vw, 44px) auto clamp(18px, 3vw, 28px); padding: 0; flex-wrap: wrap; }
.step {
position: relative; display: flex; align-items: center; gap: var(--sp-2); padding: 7px 16px 7px 13px; border: 1px solid transparent; border-radius: var(--r-pill); font-size: 0.85rem; font-weight: 600; color: var(--text-3); transition: color var(--dur-med) var(--ease-out),
background-color var(--dur-med) var(--ease-out),
border-color var(--dur-med) var(--ease-out); }
.step + .step {
margin-left: clamp(16px, 4vw, 30px); }
.step + .step::before {
content: ''; position: absolute; left: calc(-1 * clamp(16px, 4vw, 30px)); top: 50%; width: clamp(16px, 4vw, 30px); height: 2px; margin-top: -1px; border-radius: var(--r-pill); background: var(--border); transition: background-color var(--dur-med) var(--ease-out); }
.step.is-done + .step::before,
.step.is-done::before {
background: color-mix(in srgb, var(--c-green) 55%, var(--border)); }
.step-dot {
position: relative; width: 9px; height: 9px; border-radius: 50%; background: var(--border-strong); transition: background-color var(--dur-med) var(--ease-out), box-shadow var(--dur-med) var(--ease-out); flex: none; }
.step.is-active {
color: var(--text); background: var(--surface); border-color: var(--border); }
.step.is-active .step-dot {
background: var(--c-cyan); box-shadow: 0 0 0 4px color-mix(in srgb, var(--c-cyan) 20%, transparent); animation: dot-pulse 1.6s var(--ease-in-out) infinite; }
.step.is-done {
color: var(--text-2); }
.step.is-done .step-dot {
background: var(--c-green); }
@keyframes dot-pulse { 0%, 100% { box-shadow: 0 0 0 4px color-mix(in srgb, var(--c-cyan) 20%, transparent); }
50% {
box-shadow: 0 0 0 7px color-mix(in srgb, var(--c-cyan) 6%, transparent); }
}

/* ==========================================================================
   07. TEST CARD & GAUGE
   ========================================================================== */

.test-card {
position: relative; max-width: 880px; margin-inline: auto; padding: clamp(24px, 4vw, 40px); overflow: hidden; }
/* Gradient hairline along the top edge of the card. */
.test-card::before {
content: ''; position: absolute; inset: 0 0 auto 0; height: 1px; background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--c-cyan) 70%, transparent), color-mix(in srgb, var(--c-violet) 70%, transparent), transparent); }

/* Status line above the gauge */
.phase-label {
display: inline-flex; align-items: center; gap: 9px; text-align: center; color: var(--text-2); font-size: 0.9rem; font-weight: 600; letter-spacing: 0.01em; min-height: 1.6em; transition: color var(--dur-med) var(--ease-out); }
.phase-dot {
width: 7px; height: 7px; border-radius: 50%; background: var(--text-3); flex: none; transition: background-color var(--dur-med) var(--ease-out), box-shadow var(--dur-med) var(--ease-out); }
.phase-label.is-busy { color: var(--text); }
.phase-label.is-busy .phase-dot {
background: var(--c-cyan); box-shadow: 0 0 0 3px color-mix(in srgb, var(--c-cyan) 20%, transparent); animation: dot-pulse 1.6s var(--ease-in-out) infinite; }

.gauge-wrap {
display: grid; place-items: center; margin-block: var(--sp-5) var(--sp-6); }
.gauge {
position: relative; width: min(320px, 76vw); aspect-ratio: 1; }
.gauge-svg {
width: 100%; height: 100%; overflow: visible; }
.gauge-track {
fill: none; stroke: var(--surface-2); stroke-width: 14; stroke-linecap: round; }
.gauge-value {
fill: none; stroke: url(#gaugeGrad); stroke-width: 14; stroke-linecap: round; filter: url(#gaugeGlow); transition: stroke-dasharray var(--dur-med) var(--ease-out); }
.gauge-cap {
fill: #fff; filter: url(#gaugeGlow); transition: cx var(--dur-med) var(--ease-out), cy var(--dur-med) var(--ease-out), opacity var(--dur-med) var(--ease-out); }
[data-theme='light'] .gauge-cap {
fill: var(--c-cyan); }

.gauge-center {
position: absolute; inset: 0; display: grid; place-content: center; text-align: center; pointer-events: none; }
.gauge-value-text {
font-family: var(--font-display); font-size: clamp(2.7rem, 12vw, 4rem); font-weight: 700; line-height: 1; letter-spacing: -0.05em; font-variant-numeric: tabular-nums; background: var(--brand-gradient); -webkit-background-clip: text; background-clip: text; color: transparent; }
.gauge-unit {
margin-top: 7px; color: var(--text-2); font-size: 0.8rem; font-weight: 600; letter-spacing: 0.16em; text-transform: uppercase; }

/* Scale legend under the ring */
.gauge-scale {
position: absolute; inset: auto 0 12%; display: flex; justify-content: space-between; padding-inline: 6%; color: var(--text-3); font-size: 0.72rem; font-weight: 600; font-variant-numeric: tabular-nums; pointer-events: none; }

.controls {
display: flex; justify-content: center; align-items: center; gap: var(--sp-3); min-height: 64px; flex-wrap: wrap; }

/* ==========================================================================
   08. GRAPH
   ========================================================================== */

.graph-wrap {
margin-top: var(--sp-6); padding-top: var(--sp-5); border-top: 1px solid var(--border); }
.graph-head {
display: flex; align-items: center; justify-content: space-between; gap: var(--sp-3); margin-bottom: var(--sp-3); }
.graph-title {
font-size: 0.92rem; font-weight: 600; color: var(--text-2); }
.graph-peak {
padding: 4px 11px; border: 1px solid var(--border); border-radius: var(--r-pill); background: var(--surface-2); color: var(--text-2); font-size: 0.78rem; font-weight: 600; font-variant-numeric: tabular-nums; }
.graph {
display: block; width: 100%; height: auto; aspect-ratio: 900 / 260; border-radius: var(--r-md); background: var(--surface-2); border: 1px solid var(--border); }

/* ==========================================================================
   09. ALERT
   ========================================================================== */

.alert {
display: flex; align-items: flex-start; gap: var(--sp-3); margin-top: var(--sp-5); padding: var(--sp-4); border: 1px solid color-mix(in srgb, var(--c-rose) 35%, transparent); border-radius: var(--r-md); background: color-mix(in srgb, var(--c-rose) 9%, transparent); }
.alert[hidden] {
display: none; }
.alert-icon {
width: 20px; height: 20px; flex: none; margin-top: 1px; color: var(--c-rose); }
.alert-body {
flex: 1; min-width: 0; }
.alert-title {
font-weight: 700; font-size: 0.93rem; }
.alert-text {
color: var(--text-2); font-size: 0.89rem; margin-top: 2px; }

/* ==========================================================================
   10. RESULTS
   ========================================================================== */

.verdict {
display: flex; align-items: center; gap: var(--sp-5); padding: var(--sp-5) var(--sp-6); margin-bottom: var(--sp-5); border: 1px solid var(--border); border-radius: var(--r-lg); background: var(--surface); box-shadow: var(--shadow-md); backdrop-filter: blur(var(--glass-blur)); -webkit-backdrop-filter: blur(var(--glass-blur)); }
.verdict-icon {
display: grid; place-items: center; width: 54px; height: 54px; flex: none; border-radius: var(--r-md); background: color-mix(in srgb, var(--c-amber) 15%, transparent); color: var(--c-amber); }
.verdict-icon svg {
width: 26px; height: 26px; }
.verdict-text {
min-width: 0; }
.verdict-title {
font-family: var(--font-display); font-size: 1.35rem; font-weight: 700; letter-spacing: -0.025em; }
.verdict-desc {
color: var(--text-2); font-size: 0.95rem; margin-top: 3px; }

.metric-grid {
display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-4); margin-bottom: var(--sp-5); }
/* The download card is the headline: it takes a double-width cell and reads
   larger, so the layout is a 2x2 block on wide screens (dl / ul / pi / ji). */
.metric-hero {
grid-column: span 2; }
.metric-hero .metric-value {
font-size: clamp(2.4rem, 7vw, 3.4rem); }
.metric {
position: relative; padding: var(--sp-5); overflow: hidden; transition: transform var(--dur-med) var(--ease-out), border-color var(--dur-med) var(--ease-out); }
.metric:hover {
transform: translateY(-2px); border-color: color-mix(in srgb, var(--metric-color, var(--c-cyan)) 40%, transparent); }
/* Coloured accent line along the bottom edge. */
.metric::after {
content: ''; position: absolute; inset: auto 0 0 0; height: 2px; background: var(--metric-color, var(--c-cyan)); opacity: 0.85; }
/* Soft colour wash that grows on hover. */
.metric::before {
content: ''; position: absolute; inset: 0; pointer-events: none; opacity: 0; background: radial-gradient(120% 80% at 50% 0%, color-mix(in srgb, var(--metric-color, var(--c-cyan)) 12%, transparent), transparent 70%); transition: opacity var(--dur-med) var(--ease-out); }
.metric:hover::before {
opacity: 1; }
.metric[data-metric='download'] {
--metric-color: var(--c-download); }
.metric[data-metric='upload'] {
--metric-color: var(--c-upload); }
.metric[data-metric='ping'] {
--metric-color: var(--c-ping); }
.metric[data-metric='jitter'] {
--metric-color: var(--c-jitter); }
.metric > * {
position: relative; }
.metric-head {
display: flex; align-items: center; gap: var(--sp-2); margin-bottom: var(--sp-4); }
.metric-icon {
display: grid; place-items: center; width: 32px; height: 32px; border-radius: var(--r-xs); background: color-mix(in srgb, var(--metric-color, var(--c-cyan)) 14%, transparent); color: var(--metric-color, var(--c-cyan)); }
.metric-icon svg {
width: 17px; height: 17px; }
.metric-name {
display: inline-flex; align-items: center; gap: 6px; font-family: var(--font-ui); font-size: 0.78rem; font-weight: 600; letter-spacing: 0.07em; text-transform: uppercase; color: var(--text-3); }

/* Tooltip trigger */
.tip {
display: inline-grid; place-items: center; width: 20px; height: 20px; padding: 0; border: 0; background: transparent; color: var(--text-3); cursor: help; border-radius: 50%; transition: color var(--dur-fast) var(--ease-out); }
.tip:hover, .tip:focus-visible {
color: var(--c-cyan); }
.tip svg {
width: 15px; height: 15px; }

/* Floating tooltip bubble */
.tooltip {
position: fixed; z-index: 60; max-width: min(280px, calc(100vw - 24px)); padding: 10px 13px; border: 1px solid var(--border-strong); border-radius: var(--r-sm); background: var(--surface-solid); color: var(--text-2); font-size: 0.82rem; line-height: 1.5; box-shadow: var(--shadow-lg); pointer-events: none; animation: tip-in var(--dur-fast) var(--ease-out); }
.tooltip[hidden] {
display: none; }
@keyframes tip-in { from { opacity: 0; transform: translateY(4px); }
to {
opacity: 1; transform: translateY(0); }
}

.metric-value {
display: flex; align-items: baseline; gap: 6px; font-family: var(--font-display); font-size: clamp(1.95rem, 5vw, 2.55rem); font-weight: 700; line-height: 1.05; letter-spacing: -0.04em; font-variant-numeric: tabular-nums; color: var(--text); }
.metric-unit {
font-family: var(--font-ui); font-size: 0.9rem; font-weight: 600; color: var(--text-3); letter-spacing: 0.02em; }
.metric-note {
margin-top: 8px; color: var(--text-3); font-size: 0.82rem; line-height: 1.45; min-height: 1.2em; }

/* ---- Connection details ------------------------------------------------- */
.info-card {
padding: var(--sp-5) var(--sp-6) var(--sp-5); }
.info-head {
display: flex; align-items: center; justify-content: space-between; gap: var(--sp-3); margin-bottom: var(--sp-5); flex-wrap: wrap; }
.info-head h3 {
font-size: 1.05rem; }
.info-list {
display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: var(--sp-4) var(--sp-6); margin: 0; }
.info-row {
display: flex; flex-direction: column; gap: 3px; }
.info-row dt {
font-size: 0.72rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-3); }
.info-row dd {
margin: 0; font-size: 0.94rem; font-weight: 500; word-break: break-word; }

.results-actions {
display: flex; gap: var(--sp-3); flex-wrap: wrap; margin-top: var(--sp-5); }
.share-canvas {
display: none; }

/* ==========================================================================
   11. HISTORY
   ========================================================================== */

.history-card {
padding: var(--sp-3) var(--sp-6) var(--sp-4); }
.history-list {
list-style: none; margin: 0; padding: 0; }
.history-item {
display: grid; grid-template-columns: 1fr auto; align-items: center; gap: var(--sp-3) var(--sp-5); padding: var(--sp-4) 0; border-bottom: 1px solid var(--border); }
.history-item:last-child {
border-bottom: 0; }
.history-when {
font-size: 0.78rem; font-weight: 600; color: var(--text-3); letter-spacing: 0.02em; }
.history-stats {
display: flex; gap: var(--sp-4); flex-wrap: wrap; margin-top: 5px; font-size: 0.88rem; font-variant-numeric: tabular-nums; }
.history-stat {
display: inline-flex; align-items: center; gap: 6px; color: var(--text-2); }
.history-dot {
width: 7px; height: 7px; border-radius: 50%; flex: none; }
.history-stat b {
color: var(--text); font-weight: 600; }
.history-bar {
width: 100%; max-width: 200px; height: 5px; border-radius: var(--r-pill); background: var(--surface-2); overflow: hidden; }
.history-bar i {
display: block; height: 100%; border-radius: inherit; background: var(--brand-gradient); }
.history-empty {
text-align: center; color: var(--text-3); padding: var(--sp-6) 0; font-size: 0.92rem; }
.history-foot {
display: flex; justify-content: flex-end; padding-top: var(--sp-4); border-top: 1px solid var(--border); margin-top: var(--sp-2); }

/* ==========================================================================
   12. HOW IT WORKS & FAQ
   ========================================================================== */

.how-grid {
display: grid; grid-template-columns: repeat(auto-fit, minmax(255px, 1fr)); gap: var(--sp-4); list-style: none; margin: 0; padding: 0; }
.how-card {
position: relative; padding: var(--sp-6) var(--sp-5) var(--sp-5); transition: transform var(--dur-med) var(--ease-out), border-color var(--dur-med) var(--ease-out); }
.how-card:hover {
transform: translateY(-2px); border-color: var(--border-strong); }
.how-num {
display: inline-grid; place-items: center; min-width: 38px; height: 38px; padding-inline: 10px; margin-bottom: var(--sp-4); border-radius: var(--r-xs); background: var(--surface-2); font-family: var(--font-display); font-size: 0.9rem; font-weight: 700; letter-spacing: 0.02em; color: var(--c-cyan); }
.how-card h3 {
font-size: 1.12rem; margin-bottom: var(--sp-2); }
.how-card p {
color: var(--text-2); font-size: 0.92rem; }
.how-meta {
margin-top: var(--sp-4) !important; font-size: 0.78rem !important; font-weight: 600 !important; color: var(--c-cyan) !important; letter-spacing: 0.02em; }

.faq-list {
display: grid; gap: var(--sp-2); }
.faq-item {
border: 1px solid var(--border); border-radius: var(--r-md); background: var(--surface); overflow: hidden; transition: border-color var(--dur-med) var(--ease-out), background-color var(--dur-med) var(--ease-out); }
.faq-item[open] {
border-color: var(--border-strong); background: var(--surface-2); }
.faq-item summary {
display: flex; align-items: center; justify-content: space-between; gap: var(--sp-4); min-height: 58px; padding: var(--sp-4) var(--sp-5); cursor: pointer; font-weight: 600; font-size: 0.98rem; list-style: none; transition: color var(--dur-fast) var(--ease-out); }
.faq-item summary::-webkit-details-marker {
display: none; }
.faq-item summary:hover {
color: var(--c-cyan); }
.faq-item summary::after {
content: ''; flex: none; width: 10px; height: 10px; border-right: 2px solid var(--text-3); border-bottom: 2px solid var(--text-3); transform: rotate(45deg) translateY(-2px); transition: transform var(--dur-med) var(--ease-out); }
.faq-item[open] summary::after {
transform: rotate(-135deg) translateY(-2px); }
.faq-body {
padding: 0 var(--sp-5) var(--sp-5); color: var(--text-2); font-size: 0.92rem; }
.faq-body p + p {
margin-top: var(--sp-3); }

/* ==========================================================================
   13. FOOTER
   ========================================================================== */

.site-footer {
border-top: 1px solid var(--border); padding-block: var(--sp-7) var(--sp-6); margin-top: var(--sp-6); }
.footer-inner {
display: flex; justify-content: space-between; gap: var(--sp-6); flex-wrap: wrap; }
.footer-brand p {
margin-top: var(--sp-3); max-width: 42ch; color: var(--text-3); font-size: 0.88rem; }
.footer-credit {
max-width: 52ch; }
.footer-credit a {
color: var(--text-2); text-decoration: none; border-bottom: 1px solid var(--border-strong); transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out); }
.footer-credit a:hover {
color: var(--c-cyan); border-color: var(--c-cyan); }
.footer-links {
display: flex; gap: var(--sp-2); align-items: flex-start; font-size: 0.9rem; }
.footer-links a {
display: inline-flex; align-items: center; min-height: 44px; padding-inline: 12px; border-radius: var(--r-sm); color: var(--text-2); text-decoration: none; transition: color var(--dur-fast) var(--ease-out), background-color var(--dur-fast) var(--ease-out); }
.footer-links a:hover {
color: var(--c-cyan); background: var(--surface-2); }
.footer-note {
max-width: var(--container); margin: var(--sp-6) auto 0; padding-inline: clamp(16px, 4vw, 32px); color: var(--text-3); font-size: 0.8rem; text-align: center; }

/* ==========================================================================
   14. RESPONSIVE
   ========================================================================== */

@media (max-width: 780px) { .header-nav { display: none; }
.header-actions {
margin-inline-start: auto; }
.stepper {
gap: 0; }
.step {
padding: 7px 12px 7px 10px; }
.step-label {
font-size: 0.76rem; }
.footer-inner {
flex-direction: column; }
}
@media (max-width: 900px) { .metric-grid { grid-template-columns: 1fr 1fr; }
.metric-hero { grid-column: span 2; }
/* On two-column layouts the last card would sit alone, so let it span the
   full width and keep the block visually balanced. */
.metric:last-child { grid-column: span 2; }
}
@media (max-width: 520px) { .unit-btn { min-height: 32px; padding: 0 10px; font-size: 0.76rem; }
.header-actions {
gap: var(--sp-2); }
.controls {
flex-direction: column; align-items: stretch; }
.controls .btn {
width: 100%; }
.metric-grid {
grid-template-columns: 1fr 1fr; }
.metric-hero {
grid-column: span 2; }
.metric {
padding: var(--sp-4); }
.verdict {
flex-direction: column; align-items: flex-start; gap: var(--sp-3); padding: var(--sp-5); }
.info-card, .history-card {
padding-inline: var(--sp-5); }
.history-item {
grid-template-columns: 1fr; }
.history-bar {
max-width: none; }
}
@media (max-width: 420px) { /* Keep the header on one line at 320px: the brand
shrinks, the unit toggle tightens and the gaps close up. */
.header-inner {
gap: var(--sp-2); }
.brand {
gap: 7px; }
.brand-mark {
width: 26px; height: 26px; }
.brand-name {
font-size: 1.03rem; }
.header-actions {
gap: 6px; }
.unit-toggle {
padding: 2px; }
.unit-btn {
min-height: 30px; padding: 0 8px; font-size: 0.7rem; }
.icon-btn {
width: 38px; height: 38px; }
}
@media (max-width: 380px) { .gauge { width: min(272px, 84vw); }
.metric-grid {
grid-template-columns: 1fr; }
.metric-hero, .metric:last-child {
grid-column: span 1; }
.step-label {
display: none; }
.step {
padding: 8px; }
.step + .step {
margin-left: 12px; }
.step + .step::before {
left: -12px; width: 12px; }
}

/* ==========================================================================
   15. MOTION & ACCESSIBILITY
   ========================================================================== */

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; }
*,
*::before,
*::after {
animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
.gauge-value, .gauge-cap {
transition: none; }
}
.reveal {
opacity: 0; transform: translateY(14px); transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out); }
.reveal.is-visible {
opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; } }
@media (forced-colors: active) { .card, .verdict, .faq-item { border: 1px solid CanvasText; }
.gauge-value {
stroke: Highlight; }
}
[hidden] {
display: none !important; }