/* =========================================================================
   Elite Tools — "premium AI lab" design system
   One file, CSS custom properties, no framework. See plans/03-DESIGN-SYSTEM.md
   ========================================================================= */

:root {
  --bg-0:      #070B14;
  --bg-1:      #0C1322;
  --panel:     rgba(255,255,255,0.04);
  --panel-brd: rgba(255,255,255,0.10);
  --txt-1:     #F4F7FC;
  --txt-2:     #A9B4C7;
  --txt-3:     #6B7689;
  --accent:    #2E8EFF;
  --accent-2:  #19D3C5;
  --warn:      #FFB020;
  --danger:    #FF5D5D;
  --grad-hero: linear-gradient(135deg, #2E8EFF 0%, #19D3C5 100%);
  --radius:    16px;
  --radius-sm: 10px;
  --shadow-glow: 0 0 40px rgba(46,142,255,0.18);
  --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body:    'Inter', 'Segoe UI', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg-0);
  color: var(--txt-2);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  position: relative;
  min-height: 100vh;
}

/* Ambient background: two blurred radial gradients + faint grid, fixed */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(600px 400px at 10% 0%, rgba(46,142,255,0.08), transparent 60%),
    radial-gradient(600px 400px at 90% 100%, rgba(25,211,197,0.08), transparent 60%),
    var(--bg-0);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: linear-gradient(to bottom, black, transparent 85%);
  -webkit-mask-image: linear-gradient(to bottom, black, transparent 85%);
}

h1, h2, h3, h4 { font-family: var(--font-display); color: var(--txt-1); margin: 0 0 .5em; font-weight: 700; }
h1 { font-size: clamp(2rem, 5vw, 3.2rem); line-height: 1.15; }
h2 { font-size: clamp(1.4rem, 3vw, 1.9rem); font-weight: 600; }
h3 { font-size: 1.15rem; font-weight: 600; }
p { margin: 0 0 1em; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.accent { color: var(--accent); }
.gradient-word {
  background: var(--grad-hero);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.container { max-width: 1160px; margin: 0 auto; padding: 0 20px; }
.tools-main { display: block; }
.section { padding: 64px 0; }
.section--alt { background: var(--bg-1); }

/* ---------------------------------------------------------------- header */
.tools-header {
  position: sticky; top: 0; z-index: 100;
  height: 68px;
  background: rgba(7,11,20,0.75);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--panel-brd);
}
.tools-header__inner {
  max-width: 1160px; margin: 0 auto; padding: 0 20px;
  height: 68px;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.tools-logo { display: flex; align-items: center; gap: 10px; color: var(--txt-1); min-width: 0; flex-shrink: 1; }
.tools-logo:hover { text-decoration: none; opacity: .9; }
.tools-logo img { border-radius: 8px; flex-shrink: 0; }
.tools-logo__word { font-family: var(--font-display); font-weight: 700; font-size: 1.3rem; color: var(--txt-1); white-space: nowrap; }
.tools-pill {
  font-size: 10px; letter-spacing: .08em; text-transform: uppercase;
  padding: 3px 9px; border-radius: 999px;
  border: 1px solid transparent;
  border-image: var(--grad-hero) 1;
  color: var(--txt-1);
  white-space: nowrap; flex-shrink: 0;
}
.tools-nav { display: flex; align-items: center; gap: 22px; }
.tools-nav a { color: var(--txt-2); font-size: 14px; font-weight: 500; }
.tools-nav a:hover { color: var(--txt-1); text-decoration: none; }
.tools-header__right { display: flex; align-items: center; gap: 14px; flex-shrink: 0; }
.tools-hi { color: var(--txt-1); font-size: 14px; font-weight: 500; white-space: nowrap; }
.tools-hamburger {
  display: none; background: none; border: 1px solid var(--panel-brd);
  color: var(--txt-1); font-size: 18px; width: 40px; height: 40px; border-radius: 10px; cursor: pointer;
  flex-shrink: 0;
}
.btn-ghost--sm { white-space: nowrap; }

/* ---------------------------------------------------------------- footer */
.tools-footer { background: var(--bg-1); border-top: 1px solid var(--panel-brd); padding: 56px 0 24px; }
.tools-footer__inner {
  max-width: 1160px; margin: 0 auto; padding: 0 20px;
  display: grid; grid-template-columns: 1.2fr 1fr 1fr 1fr; gap: 32px;
}
.tools-footer__col ul { max-height: 320px; overflow-y: auto; }
.tools-logo--footer { margin-bottom: 14px; }
.tools-footer__tagline { color: var(--txt-3); font-size: 14px; max-width: 320px; }
.tools-footer__social { display: flex; gap: 14px; }
.tools-footer__social a {
  width: 34px; height: 34px; border-radius: 50%; border: 1px solid var(--panel-brd);
  display: flex; align-items: center; justify-content: center; color: var(--txt-2); font-size: 14px;
}
.tools-footer__social a:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.tools-footer__col h3 { font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: var(--txt-1); margin-bottom: 14px; }
.tools-footer__col ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.tools-footer__col a { color: var(--txt-3); font-size: 14px; }
.tools-footer__col a:hover { color: var(--txt-1); text-decoration: none; }
.tools-footer__bottom {
  max-width: 1160px; margin: 40px auto 0; padding: 20px 20px 0; border-top: 1px solid var(--panel-brd);
  color: var(--txt-3); font-size: 13px;
}

/* ----------------------------------------------------------------- hero */
.tools-hero { text-align: center; padding: 56px 0 8px; }
.badge-pill {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; font-weight: 600; letter-spacing: .04em; text-transform: uppercase;
  color: var(--accent-2); border: 1px solid var(--panel-brd); border-radius: 999px;
  padding: 6px 14px; margin-bottom: 18px; background: var(--panel);
}
.tools-hero__sub { color: var(--txt-2); font-size: 1.05rem; max-width: 640px; margin: 0 auto 28px; }
.trust-row { color: var(--txt-3); font-size: 13px; text-align: center; margin: 22px 0 0; }

/* ------------------------------------------------------------------ card */
.card {
  background: var(--panel);
  border: 1px solid var(--panel-brd);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 28px;
  margin-bottom: 20px;
}
.card--glow {
  position: relative;
  box-shadow: var(--shadow-glow);
  overflow: hidden;
}
.card--glow::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: var(--grad-hero);
}

/* -------------------------------------------------------------- buttons */
.btn-primary, .btn-ghost {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--font-body); font-weight: 600; font-size: 15px;
  border-radius: 12px; padding: 14px 28px; cursor: pointer; border: none;
  transition: transform .2s ease, box-shadow .2s ease;
}
.btn-primary { background: var(--grad-hero); color: #04121F; }
.btn-primary:hover { transform: translateY(-1px); box-shadow: var(--shadow-glow); text-decoration: none; }
.btn-primary:disabled { opacity: .6; cursor: not-allowed; transform: none; box-shadow: none; }
.btn-ghost { background: transparent; border: 1px solid var(--panel-brd); color: var(--txt-1); }
.btn-ghost:hover { border-color: var(--accent); text-decoration: none; }
.btn-ghost--sm, .btn-primary--sm { padding: 8px 16px; font-size: 13px; border-radius: 10px; }
.btn-block { width: 100%; }

/* ------------------------------------------------------------ tool panel */
.tool-panel { max-width: 760px; margin: 0 auto 32px; }

/* ------------------------------------------------------------- dropzone */
.dropzone {
  border: 1.5px dashed var(--panel-brd);
  border-radius: var(--radius);
  padding: 36px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.dropzone:hover, .dropzone--drag { border-color: var(--accent); box-shadow: var(--shadow-glow); }
.dropzone__icon { margin-bottom: 10px; opacity: .8; }
.dropzone__title { color: var(--txt-1); font-weight: 600; margin-bottom: 4px; }
.dropzone__title button { background: none; border: none; color: var(--accent); font: inherit; font-weight: 600; cursor: pointer; padding: 0; }
.dropzone__hint { color: var(--txt-3); font-size: 13px; }
.dropzone input[type=file] { display: none; }

.paste-toggle { background: none; border: none; color: var(--accent-2); font-size: 13px; cursor: pointer; margin: 12px auto 0; display: block; }
textarea.tools-textarea {
  width: 100%; min-height: 180px; resize: vertical;
  background: var(--panel); border: 1px solid var(--panel-brd); border-radius: var(--radius-sm);
  color: var(--txt-1); font-family: var(--font-body); font-size: 14px; padding: 14px; margin-top: 12px;
}
textarea.tools-textarea:focus { border-color: var(--accent); }

.extract-chip {
  display: inline-flex; align-items: center; gap: 8px; margin-top: 12px;
  background: rgba(25,211,197,.12); color: var(--accent-2);
  border: 1px solid rgba(25,211,197,.3); border-radius: 999px; padding: 6px 14px; font-size: 13px;
}
.extract-chip a { color: var(--accent-2); text-decoration: underline; margin-left: 4px; }
.extract-warning { color: var(--warn); font-size: 13px; margin-top: 10px; }

.field { margin-top: 18px; }
.field label { display: block; color: var(--txt-1); font-size: 13px; font-weight: 500; margin-bottom: 6px; }
.field input[type=text] {
  width: 100%; background: var(--panel); border: 1px solid var(--panel-brd); border-radius: var(--radius-sm);
  color: var(--txt-1); font-family: var(--font-body); font-size: 14px; padding: 12px 14px;
}
.field input[type=text]:focus { border-color: var(--accent); }

/* -------------------------------------------------------------- loader */
.ai-loader { text-align: center; padding: 48px 20px; }
.ai-loader__orb {
  width: 64px; height: 64px; margin: 0 auto 20px; border-radius: 50%;
  background: var(--grad-hero); filter: blur(2px);
  animation: orb-pulse 1.6s ease-in-out infinite;
}
@keyframes orb-pulse { 0%,100% { transform: scale(1); opacity: .7; } 50% { transform: scale(1.25); opacity: 1; } }
.ai-loader__status { color: var(--txt-2); font-size: 14px; min-height: 20px; }

/* ------------------------------------------------------------- gauge */
.score-gauge { display: flex; flex-direction: column; align-items: center; margin: 12px 0 20px; }
.score-gauge__ring { position: relative; width: 180px; height: 180px; }
.score-gauge__ring svg { width: 100%; height: 100%; }
.score-gauge__num {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  font-family: var(--font-display); font-size: 2.6rem; font-weight: 700; color: var(--txt-1);
}
.score-gauge__verdict { font-size: 15px; font-weight: 600; margin-top: 14px; text-align: center; }
.verdict--low { color: var(--danger); }
.verdict--mid { color: var(--warn); }
.verdict--high { color: var(--accent-2); }

.subscore { margin-bottom: 14px; }
.subscore__head { display: flex; justify-content: space-between; font-size: 14px; color: var(--txt-1); margin-bottom: 6px; }
.subscore__track { height: 8px; background: var(--panel-brd); border-radius: 999px; overflow: hidden; }
.subscore__fill { height: 100%; background: var(--grad-hero); border-radius: 999px; transition: width 1s ease-out; }
.subscore__comment { color: var(--txt-3); font-size: 13px; margin-top: 4px; }

/* -------------------------------------------------------------- chips */
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  display: inline-flex; align-items: center; padding: 6px 14px; border-radius: 999px; font-size: 13px; font-weight: 500;
}
.chip--found { background: rgba(25,211,197,.12); color: var(--accent-2); border: 1px solid rgba(25,211,197,.3); }
.chip--missing { background: rgba(255,93,93,.10); color: var(--danger); border: 1px solid rgba(255,93,93,.28); }

/* ------------------------------------------------------------ result list */
.result-list { list-style: none; margin: 0; padding: 0; }
.result-list li { position: relative; padding-left: 22px; margin-bottom: 10px; color: var(--txt-2); font-size: 14.5px; }
.result-list li::before { content: "+"; position: absolute; left: 0; color: var(--accent-2); font-weight: 700; }
.result-list--issues li::before { content: "!"; color: var(--danger); }
.severity-pill { display: inline-block; font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .03em; padding: 2px 8px; border-radius: 6px; margin-right: 8px; }
.severity-pill--high { background: rgba(255,93,93,.15); color: var(--danger); }
.severity-pill--medium { background: rgba(255,176,32,.15); color: var(--warn); }
.severity-pill--low { background: rgba(255,255,255,.08); color: var(--txt-3); }

.copy-btn { background: var(--panel); border: 1px solid var(--panel-brd); color: var(--txt-1); font-size: 12px; padding: 6px 12px; border-radius: 8px; cursor: pointer; }
.copy-btn:hover { border-color: var(--accent); }

.error-box { text-align: center; padding: 32px 20px; color: var(--danger); }

/* --------------------------------------------------------------- sign-in gate */
.signin-gate { text-align: center; padding: 8px 4px; }
.signin-gate__actions { display: flex; gap: 12px; justify-content: center; margin-top: 18px; flex-wrap: wrap; }

/* ------------------------------------------------------------------- CTA */
.cta-block { text-align: center; padding: 40px 32px; }
.cta-block h2 { margin-bottom: 8px; }
.cta-block p { color: var(--txt-2); max-width: 520px; margin: 0 auto 20px; }
.cta-block__actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.cta-block__fineprint { color: var(--txt-3); font-size: 12px; margin: 16px 0 0; }

/* ------------------------------------------------------------ tool grid */
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.tool-card { display: block; color: var(--txt-2); transition: transform .2s ease, box-shadow .2s ease; }
.tool-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-glow); text-decoration: none; }
.tool-card__icon {
  width: 44px; height: 44px; border-radius: 12px; background: var(--grad-hero);
  display: flex; align-items: center; justify-content: center; margin-bottom: 16px;
}
.tool-card__icon svg { width: 22px; height: 22px; stroke: #04121F; }
.tool-card h3 { margin-bottom: 6px; color: var(--txt-1); }
.tool-card p { font-size: 14px; color: var(--txt-3); margin-bottom: 10px; }
.tool-card__link { color: var(--accent); font-size: 14px; font-weight: 600; }
.tool-group-title { margin-top: 40px; margin-bottom: 16px; }
.tool-group-title:first-of-type { margin-top: 0; }

/* --------------------------------------------------------------- steps */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.step { text-align: center; }
.step__num {
  width: 36px; height: 36px; border-radius: 50%; background: var(--panel); border: 1px solid var(--panel-brd);
  display: flex; align-items: center; justify-content: center; margin: 0 auto 14px; color: var(--accent-2); font-weight: 700; font-family: var(--font-display);
}

/* ------------------------------------------------------------------ FAQ */
.faq details {
  background: var(--panel); border: 1px solid var(--panel-brd); border-radius: var(--radius-sm);
  padding: 16px 18px; margin-bottom: 10px;
}
.faq summary { cursor: pointer; color: var(--txt-1); font-weight: 600; font-size: 15px; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; float: right; color: var(--accent); font-weight: 700; }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 12px 0 0; color: var(--txt-2); font-size: 14.5px; }

/* -------------------------------------------------------------- related */
.related-tools { display: flex; flex-wrap: wrap; gap: 12px; }
.related-tools a {
  border: 1px solid var(--panel-brd); border-radius: 999px; padding: 8px 16px; font-size: 13px; color: var(--txt-2);
}
.related-tools a:hover { border-color: var(--accent); color: var(--txt-1); text-decoration: none; }

/* ------------------------------------------------------------ seo body */
.seo-body h2 { margin-top: 40px; }
.seo-body p { color: var(--txt-2); }

/* -------------------------------------------------------------- motion */
.fade-in { animation: fade-rise .3s ease-out both; }
@keyframes fade-rise { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

@media (prefers-reduced-motion: reduce) {
  .ai-loader__orb { animation: none; }
  .fade-in { animation: none; }
  html { scroll-behavior: auto; }
}

/* ------------------------------------------------------------ responsive */
@media (max-width: 860px) {
  .tools-nav {
    display: none; position: absolute; top: 68px; left: 0; right: 0;
    background: rgba(7,11,20,0.97); border-bottom: 1px solid var(--panel-brd);
    flex-direction: column; align-items: flex-start; gap: 0; padding: 8px 20px 16px;
  }
  .tools-nav--open { display: flex; }
  .tools-nav a { width: 100%; padding: 12px 0; border-bottom: 1px solid var(--panel-brd); }
  .tools-hamburger { display: block; }
  .tools-hi { display: none; }
}

@media (max-width: 480px) {
  .tools-header__inner { padding: 0 14px; gap: 10px; }
  .tools-logo { gap: 8px; }
  .tools-logo img { width: 34px; height: 34px; }
  .tools-logo__word { font-size: 1.15rem; }
  .tools-pill { display: none; }
  .tools-header__right { gap: 8px; }
  .btn-ghost--sm { padding: 7px 12px; font-size: 13px; }
}

@media (max-width: 900px) {
  .tools-footer__inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 700px) {
  .tools-footer__inner { grid-template-columns: 1fr; gap: 32px; }
  .tools-footer__col ul { max-height: none; overflow-y: visible; }
  .steps { grid-template-columns: 1fr; }
}

@media (max-width: 375px) {
  .card { padding: 16px; }
  .score-gauge__ring { width: 140px; height: 140px; }
  .score-gauge__num { font-size: 2rem; }
  .tool-grid { grid-template-columns: 1fr; }
}