/* Fonts (Inter + Sora) are loaded non-render-blocking via site.js
   to protect Largest Contentful Paint / Core Web Vitals. */
/* ============================================================
   KSRM.digital — Design System
   Modern, fast, accessible. No framework.
   ============================================================ */

:root {
  /* Color tokens — light */
  --bg: #ffffff;
  --bg-soft: #f6f8fb;
  --bg-card: #ffffff;
  --border: #e4e9f0;
  --text: #0f1b2d;
  --text-soft: #51607a;
  --text-faint: #8b97ac;
  --brand: #4f46e5;
  --brand-dark: #4338ca;
  --brand-soft: #eef0ff;
  --accent: #0ea5a4;
  --success: #16a34a;
  --warn: #d97706;
  --danger: #dc2626;
  --shadow-sm: 0 1px 2px rgba(15, 27, 45, .06), 0 1px 3px rgba(15, 27, 45, .08);
  --shadow-md: 0 4px 12px rgba(15, 27, 45, .08), 0 2px 4px rgba(15, 27, 45, .04);
  --shadow-lg: 0 12px 32px rgba(15, 27, 45, .12);
  --radius: 14px;
  --radius-sm: 9px;
  --maxw: 1120px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

/* Dark theme — applies automatically by OS preference, unless the user
   explicitly picked light; an explicit data-theme="dark" always wins. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b1120; --bg-soft: #0f172a; --bg-card: #131c31; --border: #25304a;
    --text: #eef2f9; --text-soft: #aab6cc; --text-faint: #6b7894;
    --brand: #818cf8; --brand-dark: #a5b0ff; --brand-soft: #1c2440; --accent: #2dd4bf;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
    --shadow-md: 0 6px 18px rgba(0,0,0,.45);
    --shadow-lg: 0 16px 40px rgba(0,0,0,.55);
  }
}
:root[data-theme="dark"] {
  --bg: #0b1120; --bg-soft: #0f172a; --bg-card: #131c31; --border: #25304a;
  --text: #eef2f9; --text-soft: #aab6cc; --text-faint: #6b7894;
  --brand: #818cf8; --brand-dark: #a5b0ff; --brand-soft: #1c2440; --accent: #2dd4bf;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
  --shadow-md: 0 6px 18px rgba(0,0,0,.45);
  --shadow-lg: 0 16px 40px rgba(0,0,0,.55);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

img { max-width: 100%; display: block; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 800; font-size: 1.15rem; color: var(--text);
  letter-spacing: -.02em;
}
.brand:hover { text-decoration: none; }
.brand .logo {
  width: 32px; height: 32px; border-radius: 9px;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  display: grid; place-items: center; color: #fff; font-weight: 800; font-size: .95rem;
}
.brand .dot { color: var(--brand); }
.nav-links { display: flex; align-items: center; gap: 4px; list-style: none; }
.nav-links a {
  color: var(--text-soft); font-weight: 600; font-size: .94rem;
  padding: 8px 14px; border-radius: 9px; transition: .15s;
}
.nav-links a:hover { color: var(--text); background: var(--bg-soft); text-decoration: none; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; color: var(--text); }
.nav-toggle svg { width: 26px; height: 26px; }

@media (max-width: 820px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--bg); border-bottom: 1px solid var(--border);
    padding: 8px 12px 16px; box-shadow: var(--shadow-md);
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: inherit; font-weight: 700; font-size: .95rem;
  padding: 12px 22px; border-radius: 11px; border: 1px solid transparent;
  cursor: pointer; transition: .15s; text-decoration: none; white-space: nowrap;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: var(--brand); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--brand-dark); }
.btn-ghost { background: var(--bg-card); color: var(--text); border-color: var(--border); }
.btn-ghost:hover { background: var(--bg-soft); }
.btn-lg { padding: 15px 30px; font-size: 1.05rem; }
.btn[disabled] { opacity: .5; cursor: not-allowed; transform: none; }

/* ---------- Hero ---------- */
.hero {
  padding: 76px 0 56px; text-align: center;
  background:
    radial-gradient(900px 380px at 50% -120px, var(--brand-soft), transparent 70%);
}
.hero h1 {
  font-size: clamp(2.1rem, 5.5vw, 3.5rem); font-weight: 850;
  letter-spacing: -.03em; line-height: 1.05; margin-bottom: 18px;
}
.hero h1 .grad {
  background: linear-gradient(120deg, var(--brand), var(--accent));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero p.lead {
  font-size: clamp(1.05rem, 2.4vw, 1.3rem); color: var(--text-soft);
  max-width: 640px; margin: 0 auto 30px;
}
.hero-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.trust { margin-top: 26px; color: var(--text-faint); font-size: .9rem; display: flex; gap: 18px; justify-content: center; flex-wrap: wrap; }
.trust span { display: inline-flex; align-items: center; gap: 6px; }

/* ---------- Sections ---------- */
section { padding: 56px 0; }
.section-head { text-align: center; max-width: 620px; margin: 0 auto 40px; }
.section-head h2 { font-size: clamp(1.6rem, 3.5vw, 2.3rem); font-weight: 800; letter-spacing: -.02em; margin-bottom: 12px; }
.section-head p { color: var(--text-soft); font-size: 1.08rem; }
.eyebrow { color: var(--brand); font-weight: 700; font-size: .82rem; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 10px; }

/* ---------- Cards / grids ---------- */
.grid { display: grid; gap: 18px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 900px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

.tool-card {
  display: flex; flex-direction: column; gap: 10px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px; transition: .18s; height: 100%;
}
.tool-card:hover { text-decoration: none; transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: color-mix(in srgb, var(--brand) 40%, var(--border)); }
.tool-card .ic { width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center; font-size: 1.5rem; background: var(--brand-soft); }
.tool-card h3 { font-size: 1.08rem; font-weight: 750; color: var(--text); letter-spacing: -.01em; }
.tool-card p { color: var(--text-soft); font-size: .92rem; }
.tool-card .tag { margin-top: auto; font-size: .78rem; font-weight: 700; color: var(--brand); }

.feature { text-align: center; padding: 26px 18px; }
.feature .ic { font-size: 2rem; margin-bottom: 12px; }
.feature h3 { font-size: 1.12rem; margin-bottom: 8px; }
.feature p { color: var(--text-soft); font-size: .95rem; }

/* ---------- Tool page UI ---------- */
.tool-hero { padding: 40px 0 8px; }
.breadcrumb { font-size: .85rem; color: var(--text-faint); margin-bottom: 14px; }
.breadcrumb a { color: var(--text-faint); }
.tool-hero h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 820; letter-spacing: -.02em; margin-bottom: 10px; }
.tool-hero p { color: var(--text-soft); font-size: 1.08rem; max-width: 680px; }

.panel {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow-sm);
}
.dropzone {
  border: 2px dashed var(--border); border-radius: var(--radius);
  padding: 44px 22px; text-align: center; cursor: pointer; transition: .15s;
  background: var(--bg-soft);
}
.dropzone:hover, .dropzone.drag { border-color: var(--brand); background: var(--brand-soft); }
.dropzone .ic { font-size: 2.4rem; margin-bottom: 10px; }
.dropzone p { color: var(--text-soft); }
.dropzone strong { color: var(--brand); }

label.field { display: block; margin-bottom: 16px; }
label.field span { display: block; font-weight: 650; font-size: .9rem; margin-bottom: 6px; color: var(--text); }
input[type=text], input[type=number], input[type=email], select, textarea {
  width: 100%; font-family: inherit; font-size: 1rem; color: var(--text);
  background: var(--bg); border: 1px solid var(--border); border-radius: 10px;
  padding: 12px 14px; transition: .15s;
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px var(--brand-soft); }
textarea { resize: vertical; min-height: 120px; font-family: var(--mono); }
input[type=range] { width: 100%; accent-color: var(--brand); }

.result-box {
  background: var(--bg-soft); border: 1px solid var(--border); border-radius: 10px;
  padding: 16px 18px; font-family: var(--mono); font-size: .95rem; word-break: break-word;
}
.kpi { display: flex; flex-wrap: wrap; gap: 14px; }
.kpi .item { flex: 1; min-width: 130px; background: var(--bg-soft); border: 1px solid var(--border); border-radius: 12px; padding: 16px; }
.kpi .item .v { font-size: 1.6rem; font-weight: 800; color: var(--brand); letter-spacing: -.02em; }
.kpi .item .l { font-size: .82rem; color: var(--text-soft); }

.file-list { list-style: none; margin: 16px 0 0; display: flex; flex-direction: column; gap: 8px; }
.file-list li { display: flex; align-items: center; gap: 10px; background: var(--bg-soft); border: 1px solid var(--border); border-radius: 10px; padding: 10px 14px; font-size: .9rem; }
.file-list .sz { margin-left: auto; color: var(--text-faint); font-size: .82rem; }
.file-list button { background: none; border: 0; color: var(--danger); cursor: pointer; font-size: 1.1rem; line-height: 1; }

.notice { padding: 12px 16px; border-radius: 10px; font-size: .92rem; margin: 14px 0; }
.notice.info { background: var(--brand-soft); color: var(--brand-dark); }
.notice.ok { background: color-mix(in srgb, var(--success) 14%, var(--bg)); color: var(--success); }
.notice.err { background: color-mix(in srgb, var(--danger) 14%, var(--bg)); color: var(--danger); }

.prose { max-width: 760px; margin: 0 auto; }
.prose h2 { font-size: 1.5rem; margin: 32px 0 12px; letter-spacing: -.01em; }
.prose h3 { font-size: 1.2rem; margin: 24px 0 8px; }
.prose p, .prose li { color: var(--text-soft); margin-bottom: 12px; }
.prose ul, .prose ol { padding-left: 22px; }
.faq details { border: 1px solid var(--border); border-radius: 10px; padding: 4px 18px; margin-bottom: 10px; background: var(--bg-card); }
.faq summary { cursor: pointer; font-weight: 650; padding: 12px 0; color: var(--text); }
.faq details[open] summary { color: var(--brand); }
.faq p { padding-bottom: 14px; }

/* ---------- Ad slots ---------- */
.ad-slot {
  margin: 28px auto; text-align: center; width: 100%; max-width: 100%;
  min-height: 90px; display: block;
  color: var(--text-faint); font-size: .8rem;
}
.ad-slot .adsbygoogle { width: 100%; display: block; }
.ad-label { font-size: .68rem; text-transform: uppercase; letter-spacing: .1em; color: var(--text-faint); display: block; margin-bottom: 4px; }

/* ---------- Footer ---------- */
.site-footer { margin-top: auto; background: var(--bg-soft); border-top: 1px solid var(--border); padding: 48px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr 1fr; gap: 28px; }
@media (max-width: 980px) { .footer-grid { grid-template-columns: 1fr 1fr 1fr; } }
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; } }
.footer-grid h4 { font-size: .82rem; text-transform: uppercase; letter-spacing: .07em; color: var(--text-faint); margin-bottom: 14px; }
.footer-grid ul { list-style: none; }
.footer-grid li { margin-bottom: 9px; }
.footer-grid a { color: var(--text-soft); font-size: .93rem; }
.footer-grid a:hover { color: var(--brand); }
.footer-about p { color: var(--text-soft); font-size: .93rem; max-width: 280px; }
.footer-bottom { margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; color: var(--text-faint); font-size: .85rem; }

.hidden { display: none !important; }
.mt-0{margin-top:0}.mt-1{margin-top:10px}.mt-2{margin-top:20px}.mt-3{margin-top:30px}
.text-center{text-align:center}
.spinner { width: 22px; height: 22px; border: 3px solid var(--brand-soft); border-top-color: var(--brand); border-radius: 50%; animation: spin .7s linear infinite; display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ============================================================
   UI/UX polish layer (site-wide)
   ============================================================ */

/* Accessibility: clear keyboard focus ring */
a:focus-visible, button:focus-visible, input:focus-visible,
select:focus-visible, textarea:focus-visible, [tabindex]:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--brand) 55%, transparent);
  outline-offset: 2px; border-radius: 6px;
}
:focus:not(:focus-visible) { outline: none; }

/* Nice text selection + scrollbar */
::selection { background: color-mix(in srgb, var(--brand) 28%, transparent); }
* { scrollbar-color: var(--border) transparent; }
::-webkit-scrollbar { width: 12px; height: 12px; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 8px; border: 3px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: var(--text-faint); }

/* Header: smooth elevation when scrolled, active link */
.site-header { transition: box-shadow .25s ease, background .25s ease; }
.site-header.scrolled { box-shadow: 0 6px 24px rgba(15,27,45,.10); }
.nav-links a.active { color: var(--brand); background: var(--brand-soft); }

/* Theme toggle button in header */
.theme-toggle {
  background: none; border: 1px solid var(--border); color: var(--text);
  width: 40px; height: 40px; border-radius: 10px; cursor: pointer;
  display: inline-grid; place-items: center; transition: .15s; margin-left: 6px;
}
.theme-toggle:hover { background: var(--bg-soft); border-color: var(--brand); color: var(--brand); }
.theme-toggle svg { width: 19px; height: 19px; }
@media (max-width: 820px){ .theme-toggle { position: absolute; right: 64px; top: 12px; } }

/* Buttons: springier feedback + sheen on primary */
.btn { transition: transform .12s ease, background .15s ease, box-shadow .15s ease, border-color .15s; }
.btn:active { transform: translateY(1px) scale(.99); }
.btn-primary { background-image: linear-gradient(180deg, color-mix(in srgb,var(--brand) 92%, #fff) 0%, var(--brand) 100%); }
.btn-primary:hover { box-shadow: 0 8px 20px color-mix(in srgb, var(--brand) 38%, transparent); }

/* Cards: smoother lift + subtle border glow already; add icon pop */
.tool-card { transition: transform .18s cubic-bezier(.2,.7,.3,1), box-shadow .18s, border-color .18s; }
.tool-card:hover .ic { transform: scale(1.08) rotate(-3deg); transition: transform .25s cubic-bezier(.2,.7,.3,1); }
.tool-card .ic { transition: transform .25s; }

/* Hero: layered, richer gradient + soft grid */
.hero { position: relative; overflow: hidden; }
.hero::after {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(520px 320px at 85% -40px, color-mix(in srgb, var(--accent) 16%, transparent), transparent 70%),
    radial-gradient(620px 360px at 12% 0%, color-mix(in srgb, var(--brand) 14%, transparent), transparent 70%);
}

/* Scroll-reveal for sections */
.reveal { opacity: 0; transform: translateY(14px); }
.reveal.in { opacity: 1; transform: none; transition: opacity .6s ease, transform .6s cubic-bezier(.2,.7,.3,1); }

/* Back-to-top floating button */
.to-top {
  position: fixed; right: 20px; bottom: 20px; z-index: 60;
  width: 46px; height: 46px; border-radius: 50%; border: 1px solid var(--border);
  background: var(--bg-card); color: var(--brand); cursor: pointer;
  box-shadow: var(--shadow-md); display: grid; place-items: center;
  opacity: 0; visibility: hidden; transform: translateY(12px); transition: .25s;
}
.to-top.show { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { background: var(--brand); color: #fff; border-color: var(--brand); }
.to-top svg { width: 22px; height: 22px; }

/* Inputs: smoother focus */
input, select, textarea { transition: border-color .15s, box-shadow .15s, background .15s; }

/* Respect reduced-motion preferences */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1 !important; transform: none !important; }
}

/* ============================================================
   Apple-grade refinement layer
   Restrained, spacious, confident type, spring motion.
   ============================================================ */
:root {
  --ease-spring: cubic-bezier(.2,.8,.2,1);
  --ease-out: cubic-bezier(.16,1,.3,1);
}
html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body { font-feature-settings: "cv02","cv03","cv04","ss01"; letter-spacing: -0.011em; }

/* Display typography — big, tight, confident (SF-like via system font) */
.hero h1 { font-weight: 800; letter-spacing: -0.035em; line-height: 1.04; font-size: clamp(2.4rem, 6vw, 4.2rem); }
.hero p.lead { font-size: clamp(1.1rem, 2.2vw, 1.45rem); color: var(--text-soft); letter-spacing: -.01em; max-width: 680px; }
.section-head h2, .tool-hero h1 { letter-spacing: -0.03em; font-weight: 800; }
.prose h2 { letter-spacing: -.02em; font-weight: 750; }

/* More generous, Apple-like breathing room */
.hero { padding: 104px 0 76px; }
section { padding: 72px 0; }
@media (max-width:600px){ .hero { padding: 64px 0 48px; } section { padding: 52px 0; } }

/* Frosted glass header, refined */
.site-header { background: color-mix(in srgb, var(--bg) 72%, transparent); backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px); }

/* Pill CTAs with depth and spring */
.btn { border-radius: 980px; font-weight: 650; letter-spacing: -.01em; transition: transform .2s var(--ease-spring), box-shadow .25s var(--ease-out), background .2s, color .2s, border-color .2s; }
.btn-lg { padding: 15px 32px; }
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0) scale(.98); }
.btn-primary { box-shadow: 0 6px 16px color-mix(in srgb, var(--brand) 30%, transparent); }
.btn-primary:hover { box-shadow: 0 12px 28px color-mix(in srgb, var(--brand) 40%, transparent); }

/* Cards: softer, rounder, deeper hover (Apple product-card feel) */
.tool-card { border-radius: 20px; transition: transform .35s var(--ease-out), box-shadow .35s var(--ease-out), border-color .25s, background .25s; }
.tool-card:hover { transform: translateY(-6px); box-shadow: 0 22px 48px rgba(15,27,45,.14); }
.panel { border-radius: 22px; }
.feature .ic { transition: transform .35s var(--ease-spring); }
.feature:hover .ic { transform: translateY(-4px) scale(1.12); }

/* Bigger soft radii across primary surfaces */
.dropzone { border-radius: 20px; transition: border-color .2s, background .2s, transform .2s var(--ease-out); }
.dropzone:hover { transform: translateY(-2px); }

/* Reveal: add a subtle scale for that smooth Apple settle */
.reveal { opacity: 0; transform: translateY(22px) scale(.985); }
.reveal.in { opacity: 1; transform: none; transition: opacity .8s var(--ease-out), transform .9s var(--ease-out); }

/* Hero entrance: gently fade/rise the hero content on load */
@keyframes heroRise { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }
.hero h1 { animation: heroRise .8s var(--ease-out) both; }
.hero p.lead { animation: heroRise .8s var(--ease-out) .08s both; }
.hero .hero-cta { animation: heroRise .8s var(--ease-out) .16s both; }
.hero .trust { animation: heroRise .8s var(--ease-out) .24s both; }

/* Brand logo subtle depth */
.brand .logo { box-shadow: 0 4px 12px color-mix(in srgb, var(--brand) 35%, transparent); transition: transform .3s var(--ease-spring); }
.brand:hover .logo { transform: rotate(-6deg) scale(1.06); }

/* Links: refined underline animation in prose */
.prose p a, .prose li a { background-image: linear-gradient(var(--brand),var(--brand)); background-size: 0% 1.5px; background-position: 0 100%; background-repeat: no-repeat; transition: background-size .3s var(--ease-out); padding-bottom: 1px; }
.prose p a:hover, .prose li a:hover { background-size: 100% 1.5px; text-decoration: none; }

/* ============================================================
   2025 PREMIUM OVERHAUL  (loaded last → highest precedence)
   Modern type, aurora, glassmorphism, gradient-glow motion.
   ============================================================ */
:root{
  --font:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  --display:"Sora","Inter",-apple-system,sans-serif;
  --brand:#6d4aff; --brand-dark:#5a37e0; --brand-soft:#efeaff; --accent:#19c3c9;
  --grad1:#7c5cff; --grad2:#19c3c9; --grad3:#ff5d9e;
}
@media (prefers-color-scheme: dark){ :root:not([data-theme="light"]){
  --bg:#070912; --bg-soft:#0d1020; --bg-card:#11152a; --border:#222844;
  --brand:#8b7bff; --brand-dark:#a99bff; --brand-soft:#1a1c3a; --accent:#2fe0e6;
}}
:root[data-theme="dark"]{
  --bg:#070912; --bg-soft:#0d1020; --bg-card:#11152a; --border:#222844;
  --brand:#8b7bff; --brand-dark:#a99bff; --brand-soft:#1a1c3a; --accent:#2fe0e6;
}

body{ font-family:var(--font); background:var(--bg); }
/* faint top glow on the whole page */
body::before{content:"";position:fixed;inset:0 0 auto 0;height:520px;z-index:-2;pointer-events:none;
  background:radial-gradient(1100px 420px at 50% -180px, color-mix(in srgb,var(--brand) 22%,transparent), transparent 70%);}

h1,h2,h3,.hero h1,.section-head h2,.tool-hero h1,.brand{font-family:var(--display);}
.hero h1{font-weight:800;letter-spacing:-.04em;}

/* Animated aurora hero */
.hero{position:relative;overflow:hidden;isolation:isolate;}
.hero::before{content:"";position:absolute;inset:-40% -10%;z-index:-1;pointer-events:none;
  background:
    radial-gradient(40% 50% at 20% 30%, color-mix(in srgb,var(--grad1) 38%,transparent), transparent 60%),
    radial-gradient(35% 45% at 80% 20%, color-mix(in srgb,var(--grad2) 34%,transparent), transparent 60%),
    radial-gradient(45% 50% at 60% 80%, color-mix(in srgb,var(--grad3) 26%,transparent), transparent 60%);
  filter:blur(46px) saturate(125%); animation:aurora 18s ease-in-out infinite alternate; opacity:.9;}
@keyframes aurora{
  0%{transform:translate3d(0,0,0) rotate(0deg) scale(1);}
  50%{transform:translate3d(-3%,2%,0) rotate(8deg) scale(1.12);}
  100%{transform:translate3d(3%,-2%,0) rotate(-6deg) scale(1.06);}
}
.hero .grad{background:linear-gradient(110deg,var(--grad1),var(--grad2) 45%,var(--grad3));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;background-size:200% 100%;animation:gradmove 8s ease infinite;}
@keyframes gradmove{0%,100%{background-position:0% 50%}50%{background-position:100% 50%}}

/* Glassmorphism surfaces */
.site-header{background:color-mix(in srgb,var(--bg) 62%,transparent);backdrop-filter:saturate(180%) blur(22px);-webkit-backdrop-filter:saturate(180%) blur(22px);}
.panel,.tool-card,.feature{
  background:color-mix(in srgb,var(--bg-card) 80%,transparent);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  border:1px solid color-mix(in srgb,var(--border) 80%,transparent);
}

/* Gradient-glow primary button with shine sweep */
.btn-primary{position:relative;overflow:hidden;border:0;
  background:linear-gradient(120deg,var(--grad1),var(--brand-dark));
  box-shadow:0 8px 24px color-mix(in srgb,var(--brand) 40%,transparent);}
.btn-primary::after{content:"";position:absolute;top:0;left:-120%;width:60%;height:100%;
  background:linear-gradient(100deg,transparent,rgba(255,255,255,.35),transparent);transform:skewX(-18deg);transition:left .6s var(--ease-out);}
.btn-primary:hover::after{left:140%;}
.btn-primary:hover{box-shadow:0 14px 34px color-mix(in srgb,var(--brand) 52%,transparent);}

/* Premium tool-card: gradient ring on hover + glow */
.tool-card{position:relative;border-radius:20px;transition:transform .35s var(--ease-out),box-shadow .35s var(--ease-out),border-color .3s;}
.tool-card::before{content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;opacity:0;transition:opacity .3s;
  background:linear-gradient(130deg,var(--grad1),var(--grad2),var(--grad3));
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;}
.tool-card:hover{transform:translateY(-6px);box-shadow:0 24px 50px color-mix(in srgb,var(--brand) 22%,transparent);}
.tool-card:hover::before{opacity:1;}
.tool-card .ic{background:linear-gradient(135deg,color-mix(in srgb,var(--grad1) 22%,var(--bg-card)),color-mix(in srgb,var(--grad2) 18%,var(--bg-card)));}

/* Brand logo gradient */
.brand .logo{background:linear-gradient(135deg,var(--grad1),var(--grad2));box-shadow:0 6px 16px color-mix(in srgb,var(--brand) 45%,transparent);}

/* Nicer range thumbs already brand-coloured; make focus rings brand */
::selection{background:color-mix(in srgb,var(--grad1) 30%,transparent);}

@media (prefers-reduced-motion: reduce){ .hero::before{animation:none;} .hero .grad{animation:none;} }