/* Dipole & Dial — the front panel of an old shortwave receiver: an amber slide-rule dial whose needle glides to the 20 m band, a green "magic eye" tuning tube whose dark wedge closes as the station comes in, and QSL-card tool cards; Righteous for headings and numbers, like a call sign printed on a card. */
:root,[data-theme="ham-radio-tools"]{
--color-primary:#22dd77;--color-accent:#e9b04a;--color-bg:#e7e9e6;--color-bg-alt:#dcdfdb;
--color-text:#1e1a16;--color-text-muted:#56524b;--color-border:#c9ccc6;
--card:#fbfbf9;--eye:#22dd77;--eye-deep:#0f7a44;--bakelite:#2a211b;--bakelite-2:#3b2f26;--amber:#e9b04a;--dial:#f6dca0;--ink:#1e1a16;--needle:#c8102e;
--radius-sm:3px;--radius-md:8px;
--font-display:"Righteous","Trebuchet MS","Segoe UI",Arial,sans-serif;
--font-base:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
--font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
*{box-sizing:border-box}
body{margin:0;background:var(--color-bg);color:var(--color-text);font-family:var(--font-base);-webkit-font-smoothing:antialiased}
a{color:var(--eye-deep)}
:focus-visible{outline:3px solid var(--eye-deep);outline-offset:3px}
/* nav */
.site-nav{background:var(--card);border-bottom:1px solid var(--color-border)}
.nav-container{position:relative;height:60px;max-width:1160px;margin:auto;padding:0 20px;display:flex;justify-content:space-between;align-items:center}
.nav-brand{display:flex;align-items:center;gap:12px;text-decoration:none}
.nav-logo{height:34px}
.nav-site-name{font:400 22px/1 var(--font-display);color:var(--ink)}
.nav-links,.footer-links{display:flex;gap:22px;flex-wrap:wrap}
.nav-links a,.footer-links a{text-decoration:none;color:var(--color-text-muted);font:600 15px var(--font-base)}
.nav-links a:hover,.footer-links a:hover{color:var(--eye-deep);text-decoration:underline;text-decoration-thickness:2px}
/* home */
.hr-home{max-width:1160px;margin:auto;padding:0 20px 90px}
.hr-hero{display:grid;grid-template-columns:minmax(0,1fr) 420px;gap:48px;align-items:center;margin:40px 0 44px;padding-bottom:40px;border-bottom:1px solid var(--color-border)}
.hr-copy small{font:400 15px var(--font-display);letter-spacing:.12em;text-transform:uppercase;color:var(--eye-deep)}
.hr-copy h1{font:400 clamp(38px,5vw,64px)/1.04 var(--font-display);margin:12px 0 18px;color:var(--ink)}
.hr-copy h1 em{font-style:normal;color:var(--eye-deep)}
.hr-copy p{font-size:17px;line-height:1.7;color:var(--color-text-muted);max-width:54ch;margin:0}
.hr-panel{position:relative;padding:22px 22px 20px;border-radius:14px;background:linear-gradient(170deg,var(--bakelite-2),var(--bakelite) 60%);box-shadow:inset 0 1px 0 #ffffff1f,0 20px 36px #2a211b47}
.hr-dial{position:relative;height:84px;border-radius:6px;background:radial-gradient(ellipse at 50% 40%,var(--dial),var(--amber) 85%);box-shadow:inset 0 0 0 3px #00000066,inset 0 6px 14px #00000033;overflow:hidden}
.hr-scale{position:absolute;left:14px;right:14px;top:12px;display:flex;justify-content:space-between;font:400 15px var(--font-display);color:#3a2a10}
.hr-ticks{position:absolute;left:14px;right:14px;bottom:14px;height:22px;background:repeating-linear-gradient(90deg,#3a2a10 0 2px,transparent 2px 13px);-webkit-mask:linear-gradient(#000 0 0) top/100% 55% no-repeat;mask:linear-gradient(#000 0 0) top/100% 55% no-repeat}
.hr-ticks::after{content:"";position:absolute;left:0;right:0;bottom:0;height:22px;background:repeating-linear-gradient(90deg,#3a2a10 0 2px,transparent 2px 65px)}
.hr-needle{position:absolute;top:6px;bottom:6px;left:8%;width:3px;background:var(--needle);box-shadow:0 0 4px #c8102e88;animation:hr-tune 2.2s cubic-bezier(.3,.1,.2,1) .3s forwards}
@keyframes hr-tune{to{left:59.5%}}
.hr-row{display:flex;align-items:center;justify-content:space-between;margin-top:18px}
.hr-knob{width:58px;height:58px;border-radius:50%;background:radial-gradient(circle at 40% 35%,#6b5847,#241c16 70%);box-shadow:0 4px 8px #00000066,inset 0 0 0 4px #00000040;position:relative}
.hr-knob::after{content:"";position:absolute;top:7px;left:50%;width:3px;height:14px;margin-left:-1.5px;background:var(--dial);border-radius:2px;transform-origin:50% 22px}
.hr-knob.is-tune::after{animation:hr-knob 2.2s cubic-bezier(.3,.1,.2,1) .3s forwards}
@keyframes hr-knob{to{transform:rotate(250deg)}}
.hr-eye{position:relative;width:86px;height:86px;border-radius:50%;background:radial-gradient(circle,#0c2a19 18%,var(--eye) 22%,#13a85a 70%,#06331b 72%);box-shadow:0 0 0 6px #14100c,0 0 18px #22dd7766;overflow:hidden}
.hr-wedge{position:absolute;inset:0;background:#0b1510;clip-path:polygon(50% 50%,8% 0,92% 0);transform-origin:50% 50%;animation:hr-close 2.2s cubic-bezier(.3,.1,.2,1) .3s forwards}
@keyframes hr-close{to{transform:scaleX(.12)}}
.hr-plate{font:400 13px var(--font-display);letter-spacing:.18em;color:var(--dial);text-align:center}
.hr-plate b{display:block;font-size:22px;letter-spacing:.06em;color:#fff}
.hr-rail{display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;padding-bottom:10px;font:400 20px var(--font-display);color:var(--color-text-muted)}
.hr-rail b{font-weight:400;color:var(--ink)}
.hr-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:14px}
.hr-card{position:relative;display:flex;flex-direction:column;padding:22px 22px 20px;background:var(--card);border:1px solid var(--color-border);border-radius:var(--radius-md);text-decoration:none;color:inherit;transition:transform .16s,box-shadow .16s}
.hr-card::after{content:"QSL";position:absolute;top:16px;right:16px;padding:1px 6px;border:1.5px solid var(--eye-deep);border-radius:3px;font:400 11px var(--font-display);letter-spacing:.14em;color:var(--eye-deep);transform:rotate(6deg)}
.hr-card:hover{transform:translateY(-3px) rotate(-.4deg);box-shadow:0 14px 28px #2a211b22}
.hr-sym{align-self:flex-start;font:400 21px var(--font-display);color:var(--eye-deep);border-bottom:3px solid var(--eye)}
.hr-card h2{font:400 22px/1.15 var(--font-display);margin:12px 0 8px;color:var(--ink)}
.hr-card p{margin:0 0 16px;font-size:14px;line-height:1.65;color:var(--color-text-muted);flex:1}
.hr-open{font:700 14px var(--font-base);color:var(--eye-deep)}
.hr-note{margin-top:34px;padding:16px 18px;border-left:6px solid var(--bakelite);border-radius:var(--radius-sm);background:var(--card);font-size:14px;line-height:1.7;color:var(--color-text-muted)}
/* detail */
.hrd-page{max-width:1080px;margin:auto;padding:24px 20px 90px}
.hrd-crumb{font-size:13px;color:var(--color-text-muted)}
.hrd-crumb a{text-decoration:none;font-weight:700}
.hrd-head{max-width:800px;padding:30px 0 24px}
.hrd-kicker{display:inline-block;font:400 13px var(--font-display);letter-spacing:.2em;color:var(--eye-deep)}
.hrd-head h1{font:400 clamp(34px,4.8vw,54px)/1.06 var(--font-display);margin:12px 0 14px;color:var(--ink)}
.hrd-head p{font-size:18px;line-height:1.7;color:var(--color-text-muted);margin:0}
.hrd-tool{background:var(--card);border:1px solid var(--color-border);border-radius:var(--radius-md);overflow:hidden;margin:14px 0 50px;box-shadow:0 16px 34px #2a211b1a}
.hrd-tool-label{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:12px 24px;background:linear-gradient(170deg,var(--bakelite-2),var(--bakelite));color:var(--dial);font:400 19px var(--font-display)}
.hrd-tool-label i{flex:0 0 26px;height:26px;border-radius:50%;background:radial-gradient(circle,#0c2a19 20%,var(--eye) 26%,#13a85a 72%);box-shadow:0 0 0 3px #14100c,0 0 10px #22dd7788}
.hrd-tool-body{padding:28px}
.hrd-layout{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:56px}
.hrd-reading{font-size:17px;line-height:1.8}
.hrd-reading h2{font:400 27px/1.15 var(--font-display);margin:36px 0 12px;color:var(--ink)}
.hrd-reading p{margin:0 0 14px}
.hrd-reading ol,.hrd-reading ul{margin:0 0 16px;padding-left:22px}
.hrd-reading ol{list-style:decimal}.hrd-reading ul{list-style:disc}
.hrd-reading li{margin-bottom:7px}
.hrd-side{position:relative;align-self:start;background:var(--card);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:20px;color:var(--color-text-muted);font-size:14px;line-height:1.65}
.hrd-side strong{display:block;color:var(--ink);font:400 19px var(--font-display);margin-bottom:6px}
.hrd-side a{display:inline-block;margin-top:12px;font-weight:700;text-decoration:none;color:var(--eye-deep)}
.hrd-side a:hover{text-decoration:underline}
.hrd-index{margin-top:20px;border-top:1px solid var(--color-border);padding-top:14px}
.hrd-index ul{list-style:none;margin:10px 0 0;padding:0}
.hrd-index li{padding:6px 0;font-size:13px}
.hrd-index a{display:block;margin:0;font-weight:400;color:var(--color-text)}
.hrd-index span[aria-current]{font-weight:700;color:var(--eye-deep)}
.hrd-faq,.hrd-related{margin-top:56px}
.hrd-faq h2,.hrd-related h2{font:400 27px var(--font-display);margin:0 0 16px;color:var(--ink)}
.hrd-faq details{border-bottom:1px solid var(--color-border);padding:15px 0}
.hrd-faq summary{cursor:pointer;font-weight:700}
.hrd-faq p{color:var(--color-text-muted);line-height:1.75}
.hrd-related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.hrd-related-card{display:block;background:var(--card);padding:18px 20px 20px;border:1px solid var(--color-border);border-top:6px solid var(--amber);border-radius:var(--radius-md);text-decoration:none;color:inherit;transition:transform .16s}
.hrd-related-card:hover{transform:translateY(-3px)}
.hrd-related-card h3{font:400 19px/1.2 var(--font-display);margin:0 0 8px;color:var(--ink)}
.hrd-related-card p{font-size:14px;line-height:1.6;color:var(--color-text-muted);margin:0 0 12px}
.hrd-related-card span{font:700 14px var(--font-base);color:var(--eye-deep)}
.hrd-disclaimer{margin:44px 0 0;padding:16px 18px;border-left:6px solid var(--bakelite);border-radius:var(--radius-sm);background:var(--card);font-size:14px;line-height:1.7;color:var(--color-text-muted)}
.site-footer{background:var(--card);border-top:1px solid var(--color-border);padding:32px 20px;text-align:center}
.footer-copyright{margin-top:14px;font-size:12px;color:var(--color-text-muted)}
/* tool surface */
[data-theme="ham-radio-tools"] .tool-row{gap:16px;margin-bottom:18px}
[data-theme="ham-radio-tools"] .tool-field{font-size:13px;font-weight:700;color:var(--color-text-muted);gap:7px}
[data-theme="ham-radio-tools"] .tool-input,[data-theme="ham-radio-tools"] .tool-textarea{border:1.5px solid var(--color-border);border-radius:var(--radius-sm);background:#fff;padding:10px 12px;font:16px/1.4 var(--font-base);color:var(--color-text)}
[data-theme="ham-radio-tools"] .tool-input:focus{outline:0;border-color:var(--eye-deep);box-shadow:0 0 0 3px #22dd7740}
[data-theme="ham-radio-tools"] .tool-btn{border-radius:var(--radius-sm);font:700 14px var(--font-base)}
[data-theme="ham-radio-tools"] .tool-btn-primary{background:var(--eye);color:var(--ink);border:0}
[data-theme="ham-radio-tools"] .tool-result-box{margin-top:22px;padding:22px;border-radius:var(--radius-sm);background:#fff;border:1px solid var(--color-border);border-top:5px solid var(--eye);font-size:15px;word-break:normal}
[data-theme="ham-radio-tools"] .tool-stat-hero{margin:0 0 8px;font:400 clamp(34px,6vw,54px)/1.05 var(--font-display);color:var(--ink);overflow-wrap:anywhere}
[data-theme="ham-radio-tools"] .tool-unit{display:inline-block;margin-left:12px;font:600 15px var(--font-base);color:var(--eye-deep);vertical-align:middle}
[data-theme="ham-radio-tools"] .tool-hint{font-size:14px;line-height:1.7;color:var(--color-text-muted);margin:8px 0 0}
[data-theme="ham-radio-tools"] .tool-hint strong{color:var(--ink)}
[data-theme="ham-radio-tools"] .tool-scroll{overflow-x:auto;margin-top:14px}
[data-theme="ham-radio-tools"] .tool-table td,[data-theme="ham-radio-tools"] .tool-table th{font-size:14px;background:#fff}
[data-theme="ham-radio-tools"] .tool-table th{background:var(--bakelite);color:var(--dial)}
@media(max-width:960px){
.hr-grid,.hrd-related-grid{grid-template-columns:repeat(2,1fr)}
.hr-hero{grid-template-columns:minmax(0,1fr) 340px;gap:28px}
.hr-scale{font-size:13px}
}
@media(max-width:768px){
.hr-hero{display:none}
.hr-home{padding:24px 16px 60px}
.hr-grid,.hrd-related-grid{grid-template-columns:1fr}
.hrd-head{padding-top:22px}
.hrd-layout{grid-template-columns:1fr;gap:28px}
.hrd-tool-body{padding:20px 16px}
.hrd-tool-label{padding:12px 16px}
}
@media(prefers-reduced-motion:reduce){
.hr-needle{animation:none;left:59.5%}
.hr-wedge{animation:none;transform:scaleX(.12)}
.hr-knob.is-tune::after{animation:none}
.hr-card:hover,.hrd-related-card:hover{transform:none}
}
[data-theme="ham-radio-tools"] .static-page-container a{color:var(--eye-deep)}
[data-theme="ham-radio-tools"] .guide-breadcrumb a,[data-theme="ham-radio-tools"] .guide-index-link{color:var(--eye-deep)}