:root{
    --bg:#eef4fb;--card:#fff;--text:#10233f;--muted:#5f718d;
    --primary:#1d4ed8;--line:#d8e2f0;--soft:#eff6ff;
    --shadow:0 14px 38px rgba(16,35,63,.09);--topbar-h:66px;
}
*{box-sizing:border-box}
html{min-height:100%;background:var(--bg)}
body{min-height:100vh;margin:0;background:var(--bg);color:var(--text);font-family:"Noto Sans Thai",system-ui,sans-serif}
button,a{font:inherit}
.topbar{
    position:sticky;top:0;z-index:1000;min-height:var(--topbar-h);padding:10px 18px;
    display:flex;align-items:center;justify-content:space-between;gap:14px;
    background:rgba(255,255,255,.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)
}
.brand{display:flex;align-items:center;gap:9px;color:var(--text);font-size:20px;font-weight:800;text-decoration:none}
.brand-icon{width:34px;height:26px;object-fit:contain}
.actions,.action-group{display:flex;align-items:center}.actions{gap:0}.action-group{flex:0 0 auto;gap:3px;padding:0 8px}
.action-group:first-child{padding-left:0}.action-group:last-child{padding-right:0}.action-group+.action-group{border-left:1px solid var(--line)}
.actions a,.actions button{
    width:42px;height:42px;padding:0;display:inline-flex;align-items:center;justify-content:center;
    border:0;border-radius:999px;background:transparent;color:var(--text);text-decoration:none;cursor:pointer
}
.actions a:hover,.actions button:hover,.actions .is-current{background:var(--soft);color:var(--primary)}
.contact-menu{position:relative}
.contact-panel{
    position:absolute;top:calc(100% + 10px);right:0;z-index:1100;width:min(250px,calc(100vw - 24px));
    padding:10px;display:grid;gap:5px;background:var(--card);border:1px solid var(--line);
    border-radius:16px;box-shadow:0 20px 55px rgba(15,23,42,.2)
}
.contact-panel[hidden]{display:none}
.actions .contact-panel a{width:100%;height:44px;padding:0 12px;justify-content:flex-start;gap:10px;border-radius:10px}
.contact-panel a i{width:22px;text-align:center;font-size:19px}
.help-shell{width:min(1120px,calc(100% - 32px));margin:0 auto;padding:24px 0 48px}
.back-link{display:inline-flex;align-items:center;gap:8px;margin-bottom:18px;color:var(--primary);font-weight:700;text-decoration:none}
.help-hero{
    margin-bottom:20px;padding:24px;display:flex;align-items:center;gap:18px;
    border:1px solid #bfdbfe;border-radius:22px;
    background:linear-gradient(135deg,#fff 0%,#eff6ff 100%);box-shadow:var(--shadow)
}
.help-hero-icon{width:58px;height:58px;flex:0 0 58px;display:grid;place-items:center;border-radius:18px;background:#1d4ed8;color:#fff;font-size:26px}
.help-hero h1{margin:0;font-size:clamp(25px,4vw,38px);line-height:1.15}.help-hero p{margin:7px 0 0;color:var(--muted)}
.help-grid{display:grid;grid-template-columns:minmax(0,1.7fr) minmax(280px,.8fr);gap:20px;align-items:start}
.surface{padding:20px;background:var(--card);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow)}
.section-heading{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:14px}
.section-heading h2{margin:2px 0 0;font-size:20px}.section-heading>i{color:var(--primary);font-size:22px}
.eyebrow{color:var(--primary);font-size:11px;font-weight:800;letter-spacing:.1em}
.help-list{display:grid;gap:10px}
.help-item{border:1px solid var(--line);border-radius:14px;background:var(--card);overflow:hidden}
.help-item summary{padding:15px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px;cursor:pointer;font-weight:800;list-style:none}
.help-item summary::-webkit-details-marker{display:none}.help-item summary::after{content:"+";color:var(--primary);font-size:20px}
.help-item[open] summary::after{content:"−"}.help-content{padding:0 16px 16px;color:var(--muted);line-height:1.75;white-space:pre-wrap}
.contact-list{display:grid;gap:9px}.contact-link{
    min-height:48px;padding:10px 12px;display:flex;align-items:center;gap:11px;
    border:1px solid var(--line);border-radius:12px;color:var(--text);text-decoration:none;background:var(--card)
}
.contact-link:hover{border-color:#93c5fd;background:var(--soft)}.contact-link i{width:24px;color:var(--primary);font-size:19px;text-align:center}
.contact-link span{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:700}
.loading-state,.empty-state{padding:24px 12px;text-align:center;color:var(--muted)}
body[data-theme="dark"]{--bg:#0b1220;--card:#111c2e;--text:#e6edf7;--muted:#9fb0c8;--primary:#60a5fa;--line:#263750;--soft:#17263d;--shadow:0 14px 38px rgba(0,0,0,.25)}
body[data-theme="dark"] .topbar{background:rgba(11,18,32,.94)}
body[data-theme="dark"] .help-hero{background:linear-gradient(135deg,#111c2e,#132743);border-color:#29486e}
@media(max-width:760px){
    :root{--topbar-h:58px}.topbar{min-height:var(--topbar-h);padding:8px 10px}.brand{font-size:18px}.brand-icon{width:31px;height:23px}
    .actions{max-width:55vw;overflow-x:auto;scrollbar-width:none}.actions::-webkit-scrollbar{display:none}
    .action-group{padding:0 4px;gap:1px}.actions a,.actions button{width:40px;height:40px;flex:0 0 40px}
    .contact-panel{position:fixed;top:calc(var(--topbar-h) + 8px);right:10px;max-height:calc(100dvh - var(--topbar-h) - 18px);overflow:auto}
    .help-shell{width:min(100% - 20px,680px);padding:16px 0 32px}.help-hero{padding:18px;border-radius:18px}.help-hero-icon{width:48px;height:48px;flex-basis:48px;border-radius:15px;font-size:22px}
    .help-grid{grid-template-columns:1fr}.surface{padding:15px;border-radius:17px}.contact-card{order:2}
}
@media(max-width:380px){.brand span{display:none}.actions{max-width:76vw}.help-hero{align-items:flex-start}.help-hero p{font-size:13px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}