/* ===== CSS Variables ===== */
:root {
  --bg:#000000; --bg-section:#0a0a0a; --bg-card:rgba(255,255,255,.04);
  --bg-card-hover:rgba(255,255,255,.07); --bg-input:rgba(255,255,255,.06);
  --text-primary:#f5f5f7; --text-secondary:rgba(245,245,247,.7);
  --text-tertiary:rgba(245,245,247,.45); --text-quaternary:rgba(245,245,247,.25);
  --border:rgba(255,255,255,.08); --border-focus:rgba(221,194,37,.5);
  --brand:#DDC225; --brand-dim:rgba(221,194,37,.15); --brand-glow:rgba(221,194,37,.08);
  --success:#30d158; --warning:#ff9f0a; --danger:#ff453a; --info:#64d2ff;
  --header-bg:rgba(0,0,0,.72); --code-bg:rgba(255,255,255,.06);
  --font-sans:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,SFMono-Regular,monospace;
  --radius:12px; --radius-sm:8px; --radius-lg:16px;
  --shadow:0 2px 20px rgba(0,0,0,.3);
  --transition:all .2s ease;
}

:root.light {
  --bg:#fbfbfd; --bg-section:#f5f5f7; --bg-card:rgba(0,0,0,.03);
  --bg-card-hover:rgba(0,0,0,.06); --bg-input:rgba(0,0,0,.04);
  --text-primary:#1d1d1f; --text-secondary:rgba(0,0,0,.6);
  --text-tertiary:rgba(0,0,0,.4); --text-quaternary:rgba(0,0,0,.2);
  --border:rgba(0,0,0,.1); --border-focus:rgba(180,155,20,.5);
  --brand:#b49b14; --brand-dim:rgba(180,155,20,.1); --brand-glow:rgba(180,155,20,.05);
  --header-bg:rgba(251,251,253,.72); --code-bg:rgba(0,0,0,.04);
  --shadow:0 2px 20px rgba(0,0,0,.08);
}

/* ===== Reset ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font-sans);
  background:var(--bg);
  color:var(--text-primary);
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
img{display:block;max-width:100%}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input{font-family:inherit}

/* ===== Scrollbar ===== */
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:var(--text-quaternary)}

/* ===== Container ===== */
.container{max-width:960px;margin:0 auto;padding:0 24px}

/* ===== Screen-reader only ===== */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}

/* ===== Header ===== */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  background:var(--header-bg);
  backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid var(--border);
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  height:52px;gap:16px;
}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.brand:hover{text-decoration:none}
.brand-logo{border-radius:6px}
.brand-name{font-size:18px;font-weight:700;letter-spacing:-0.02em;color:var(--text-primary)}
.nav{display:flex;align-items:center;gap:8px}
.nav-link{
  font-size:14px;font-weight:500;color:var(--text-secondary);
  padding:6px 12px;border-radius:6px;transition:var(--transition);
}
.nav-link:hover{color:var(--text-primary);background:var(--bg-card-hover);text-decoration:none}
.header-actions{display:flex;align-items:center;gap:8px}

/* Theme toggle */
.theme-toggle{
  display:flex;align-items:center;justify-content:center;
  width:36px;height:36px;border-radius:980px;
  background:var(--bg-card);border:1px solid var(--border);
  transition:var(--transition);
}
.theme-toggle:hover{background:var(--bg-card-hover);border-color:var(--border-focus)}
:root.light .icon-moon{display:none}
:root:not(.light) .icon-sun{display:none}
.theme-toggle svg{color:var(--text-secondary)}

/* Hamburger */
.hamburger{display:none;flex-direction:column;justify-content:center;align-items:center;width:36px;height:36px;gap:5px;border-radius:980px;background:var(--bg-card);border:1px solid var(--border);transition:var(--transition)}
.hamburger:hover{background:var(--bg-card-hover)}
.hamburger span{display:block;width:16px;height:1.5px;background:var(--text-secondary);border-radius:1px;transition:var(--transition)}
.hamburger.active span:nth-child(1){transform:rotate(45deg) translate(4.5px,4.5px)}
.hamburger.active span:nth-child(2){opacity:0}
.hamburger.active span:nth-child(3){transform:rotate(-45deg) translate(4.5px,-4.5px)}

/* Mobile nav */
.mobile-nav{
  display:none;flex-direction:column;padding:8px 24px 16px;
  border-bottom:1px solid var(--border);
  background:var(--header-bg);
  backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
}
.mobile-nav.open{display:flex}
.mobile-nav-link{
  font-size:15px;font-weight:500;color:var(--text-secondary);
  padding:10px 0;border-bottom:1px solid var(--border);
  transition:var(--transition);
}
.mobile-nav-link:last-child{border-bottom:none}
.mobile-nav-link:hover{color:var(--text-primary);text-decoration:none}

/* ===== Hero ===== */
.hero{
  padding:140px 0 80px;position:relative;overflow:hidden;
  background:radial-gradient(ellipse 80% 50% at 50% -20%,var(--brand-glow),transparent);
}
.hero-inner{text-align:center}
.hero-badge{
  display:inline-block;font-size:12px;font-weight:600;
  color:var(--brand);background:var(--brand-dim);
  padding:4px 14px;border-radius:980px;letter-spacing:.04em;
  text-transform:uppercase;margin-bottom:20px;
}
.hero-title{
  font-size:clamp(40px,8vw,64px);font-weight:700;letter-spacing:-0.03em;
  line-height:1.1;margin-bottom:16px;
  background:linear-gradient(135deg,var(--text-primary),var(--brand));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;
}
.hero-lead{
  font-size:clamp(16px,2.5vw,19px);color:var(--text-secondary);
  max-width:540px;margin:0 auto 28px;line-height:1.6;
}
.hero-pills{display:flex;flex-wrap:wrap;justify-content:center;gap:8px}
.pill{
  font-size:13px;font-weight:500;font-family:var(--font-mono);
  color:var(--brand);background:var(--brand-dim);
  padding:5px 14px;border-radius:980px;
  border:1px solid rgba(221,194,37,.15);
}

/* ===== Sections ===== */
.section{padding:80px 0;background:var(--bg)}
.section-dark{background:var(--bg-section)}
.section-title{
  font-size:clamp(24px,4vw,32px);font-weight:700;letter-spacing:-0.02em;
  margin-bottom:8px;
}
.section-desc{font-size:16px;color:var(--text-secondary);margin-bottom:32px;max-width:600px}

/* ===== Tool Card ===== */
.tool-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-lg);padding:24px;
  box-shadow:var(--shadow);
}

/* ===== Inputs ===== */
.text-input{
  width:100%;padding:12px 16px;font-size:15px;
  font-family:var(--font-mono);
  background:var(--bg-input);color:var(--text-primary);
  border:1px solid var(--border);border-radius:var(--radius-sm);
  outline:none;transition:var(--transition);
}
.text-input::placeholder{color:var(--text-quaternary)}
.text-input:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px var(--brand-dim)}
.input-group{position:relative;margin-bottom:16px}
.input-hint{
  font-size:12px;color:var(--danger);margin-top:4px;
  min-height:18px;
}

/* ===== Record Type Chips ===== */
.record-type-chips{
  display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px;
}
.chip{
  font-size:13px;font-weight:600;font-family:var(--font-mono);
  padding:6px 16px;border-radius:980px;
  background:var(--bg-card);border:1px solid var(--border);
  color:var(--text-secondary);transition:var(--transition);
}
.chip:hover{background:var(--bg-card-hover);color:var(--text-primary);border-color:var(--text-quaternary)}
.chip.active{
  background:var(--brand-dim);color:var(--brand);
  border-color:var(--brand);
}

/* ===== Buttons ===== */
.button-row{display:flex;gap:10px;flex-wrap:wrap}
.btn{
  font-size:14px;font-weight:600;padding:10px 24px;
  border-radius:var(--radius-sm);transition:var(--transition);
  display:inline-flex;align-items:center;justify-content:center;
}
.btn-primary{
  background:var(--brand);color:#000;border:none;
}
.btn-primary:hover{opacity:.85;transform:translateY(-1px)}
.btn-primary:active{transform:translateY(0)}
.btn-primary:disabled{opacity:.5;cursor:not-allowed;transform:none}
.btn-ghost{
  background:transparent;color:var(--text-secondary);
  border:1px solid var(--border);
}
.btn-ghost:hover{background:var(--bg-card-hover);color:var(--text-primary);border-color:var(--text-quaternary)}
.btn-sm{padding:7px 16px;font-size:13px}

/* ===== Loading ===== */
.lookup-loading{
  display:flex;align-items:center;gap:12px;
  padding:24px 0;color:var(--text-secondary);font-size:14px;
}
.spinner{
  width:20px;height:20px;border:2px solid var(--border);
  border-top-color:var(--brand);border-radius:50%;
  animation:spin .8s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg)}}

/* ===== Error ===== */
.lookup-error{
  display:flex;align-items:flex-start;gap:12px;
  padding:16px;border-radius:var(--radius-sm);
  background:rgba(255,69,58,.08);border:1px solid rgba(255,69,58,.2);
  margin-top:16px;
}
.error-icon{font-size:20px;color:var(--danger);flex-shrink:0}
.error-content strong{font-size:14px;color:var(--danger);display:block;margin-bottom:2px}
.error-content p{font-size:13px;color:var(--text-secondary);margin:0}

/* ===== Info Bar ===== */
.info-bar{
  display:flex;flex-wrap:wrap;gap:16px;padding:14px 16px;
  background:var(--bg-input);border-radius:var(--radius-sm);
  border:1px solid var(--border);margin-bottom:16px;
}
.info-item{display:flex;flex-direction:column;gap:2px;min-width:120px}
.info-label{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--text-tertiary)}
.info-value{font-size:14px;font-weight:500;font-family:var(--font-mono);color:var(--text-primary)}
.info-value.status-ok{color:var(--success)}
.info-value.status-err{color:var(--danger)}

/* ===== Table ===== */
.table-wrapper{overflow-x:auto;margin-bottom:16px;border-radius:var(--radius-sm);border:1px solid var(--border)}
.calc-table{
  width:100%;border-collapse:collapse;font-size:13px;
}
.calc-table th{
  font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.06em;
  color:var(--text-tertiary);background:var(--bg-input);
  padding:10px 14px;text-align:left;white-space:nowrap;
  border-bottom:1px solid var(--border);
}
.calc-table td{
  padding:10px 14px;border-bottom:1px solid var(--border);
  color:var(--text-secondary);font-family:var(--font-mono);
  word-break:break-all;
}
.calc-table tbody tr:last-child td{border-bottom:none}
.calc-table tbody tr:hover{background:var(--bg-card-hover)}
.calc-table td:first-child{color:var(--text-primary);font-weight:500}

/* ===== Results Actions ===== */
.results-actions{display:flex;justify-content:flex-end}

/* ===== History ===== */
.history-list{max-height:400px;overflow-y:auto}
.history-empty{
  text-align:center;padding:32px 16px;
  color:var(--text-tertiary);font-size:14px;
}
.history-item{
  display:flex;align-items:center;gap:12px;
  padding:12px 16px;border-bottom:1px solid var(--border);
  cursor:pointer;transition:var(--transition);
}
.history-item:last-child{border-bottom:none}
.history-item:hover{background:var(--bg-card-hover)}
.history-domain{font-family:var(--font-mono);font-size:14px;font-weight:500;color:var(--text-primary);flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.history-type{font-family:var(--font-mono);font-size:12px;font-weight:600;color:var(--brand);background:var(--brand-dim);padding:3px 10px;border-radius:980px;flex-shrink:0}
.history-meta{display:flex;flex-direction:column;align-items:flex-end;gap:2px;flex-shrink:0}
.history-time{font-size:11px;color:var(--text-tertiary);font-family:var(--font-mono)}
.history-status{font-size:11px;font-weight:600}
.history-status.ok{color:var(--success)}
.history-status.err{color:var(--danger)}
.history-actions{display:flex;justify-content:flex-end;padding-top:12px;border-top:1px solid var(--border);margin-top:4px}

/* ===== Reference Search ===== */
.reference-search{margin-bottom:16px}

/* ===== Footer ===== */
.site-footer{
  padding:32px 0;border-top:1px solid var(--border);
  background:var(--bg);
}
.footer-inner{
  display:flex;align-items:center;justify-content:space-between;
  flex-wrap:wrap;gap:12px;
}
.footer-inner p{font-size:13px;color:var(--text-tertiary)}
.footer-inner a{color:var(--text-secondary);font-weight:500}
.footer-inner a:hover{color:var(--brand)}
.footer-links{display:flex;gap:16px}
.footer-links a{font-size:13px;color:var(--text-tertiary);font-weight:500}
.footer-links a:hover{color:var(--brand)}

/* ===== Reveal Animation ===== */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease}
.reveal.visible{opacity:1;transform:translateY(0)}

/* ===== Responsive ===== */
@media(max-width:767px){
  .nav{display:none}
  .hamburger{display:flex}
  .hero{padding:120px 0 60px}
  .hero-title{font-size:clamp(32px,8vw,48px)}
  .section{padding:60px 0}
  .container{padding:0 16px}
  .tool-card{padding:16px}
  .info-bar{flex-direction:column;gap:10px}
  .info-item{min-width:auto}
  .calc-table th,.calc-table td{padding:8px 10px;font-size:12px}
  .footer-inner{flex-direction:column;text-align:center}
  .record-type-chips{gap:6px}
  .chip{padding:5px 12px;font-size:12px}
  .history-item{flex-wrap:wrap;gap:8px}
  .history-meta{align-items:flex-start}
}