/* RuaCoder · lớp bổ sung: cửa sổ menu bên phải, màu chữ, biểu tượng, hiệu ứng động.
   Nạp sau styles.css và khối <style> riêng của từng trang. */
:root{
  --color-bg:#f4f6fa;
  --color-surface:#e8edf5;
  --color-text:#16294a;
  --color-divider:color-mix(in srgb,#16294a 16%,transparent);
  --color-neutral-700:#4a5a74;
  --color-neutral-800:#33425c;
  --color-accent:#1976ea;
  --color-accent-100:#eaf3ff;--color-accent-200:#cfe3ff;--color-accent-300:#a6cbff;--color-accent-400:#6fa8f7;--color-accent-500:#3f8af0;
  --color-accent-600:#1468d6;--color-accent-700:#1158c0;--color-accent-800:#0e4592;--color-accent-900:#0b2f63;
  --color-accent-2:#f26b21;
  --color-accent-2-100:#fff1e8;--color-accent-2-200:#ffdcc7;--color-accent-2-300:#ffbe98;--color-accent-2-400:#ff9a5e;--color-accent-2-500:#f97f35;
  --color-accent-2-600:#e0601b;--color-accent-2-700:#b34a0a;--color-accent-2-800:#8a3907;--color-accent-2-900:#5c2706;
  --rc-blue:#1976ea;--rc-blue-d:#0e4592;--rc-cyan:#0fa3c7;--rc-green:#3fa535;--rc-green-d:#1e7a2b;
  --rc-orange:#f26b21;--rc-orange-d:#b34a0a;--rc-gold:#e0a81e;
}
html{scroll-behavior:smooth}
::selection{background:#cfe3ff}

/* ── Bố cục 2 cột: nội dung + cửa sổ bên phải ── */
.rc-layout{display:grid;grid-template-columns:minmax(0,1fr) 330px;column-gap:24px;padding-right:24px;align-items:start}
.rc-layout>main{min-width:0}
.rc-side{position:sticky;top:16px;margin:34px 0 60px;display:flex;flex-direction:column;gap:18px;min-width:0}
@media(min-width:1101px){
  .rc-layout main [style*="padding:0 70px"],.rc-layout main [style*="padding: 0 70px"],
  .rc-layout main [style*="padding:34px 70px"],.rc-layout main [style*="padding: 34px 70px"],
  .rc-layout main [style*="padding:70px 70px"],.rc-layout main [style*="padding: 70px 70px"]{padding-right:36px!important}
}
@media(min-width:1101px) and (max-width:1320px){
  .rc-layout{grid-template-columns:minmax(0,1fr) 300px;column-gap:20px;padding-right:18px}
  .rc-menu a{font-size:14px;padding:6px 7px;gap:8px}
  .rc-box{padding-left:12px;padding-right:12px}
}
@media(max-width:1100px){
  .rc-layout{display:block;padding-right:0}
  .rc-side{position:static;margin:10px 70px 56px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));align-items:start}
}
@media(max-width:900px){.rc-side{margin:10px 22px 44px}}
@media(max-width:640px){.rc-side{grid-template-columns:minmax(0,1fr)}}

/* ── Hộp trong cửa sổ ── */
.rc-box{position:relative;overflow:hidden;background:#fbfcfe;border:1px solid #d9e2ef;border-radius:14px;padding:17px 14px 14px;box-shadow:0 18px 36px -24px rgba(14,69,146,.45)}
.rc-box::before{content:"";position:absolute;left:0;right:0;top:0;height:3px;background:linear-gradient(90deg,#3fa535,#f7941d,#1976ea,#3fa535);background-size:200% 100%;animation:rc-flow 6s linear infinite}
.rc-box-title{display:flex;align-items:center;gap:10px;margin:0 0 10px;font-family:var(--font-heading);font-weight:600;font-size:17px;white-space:nowrap;line-height:1.2;color:var(--rc-blue-d)}
summary.rc-box-title{list-style:none;cursor:pointer;user-select:none;margin:0;border-radius:8px}
summary.rc-box-title::-webkit-details-marker{display:none}
details[open]>summary.rc-box-title{margin-bottom:8px}
.rc-box-title>i:first-child{display:grid;place-items:center;flex:none;width:32px;height:32px;border-radius:10px;font-size:18px;color:#fff;background:linear-gradient(135deg,#1976ea,#0fa3c7);box-shadow:0 6px 14px -6px rgba(25,118,234,.8)}
.rc-box:nth-child(2) .rc-box-title>i:first-child{background:linear-gradient(135deg,#3fa535,#1e7a2b);box-shadow:0 6px 14px -6px rgba(47,154,58,.8)}
.rc-box:nth-child(3) .rc-box-title>i:first-child{background:linear-gradient(135deg,#f7941d,#e0601b);box-shadow:0 6px 14px -6px rgba(242,107,33,.8)}
.rc-box:nth-child(4) .rc-box-title>i:first-child{background:linear-gradient(135deg,#f5c242,#e0a81e);box-shadow:0 6px 14px -6px rgba(224,168,30,.8)}
.rc-chev{margin-left:auto;font-size:16px;color:var(--color-neutral-700);transition:transform .3s ease}
details[open]>summary .rc-chev{transform:rotate(180deg)}
summary.rc-box-title:hover .rc-chev{color:var(--rc-blue)}

.rc-menu{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:1px}
.rc-menu a{display:flex;align-items:center;gap:10px;padding:7px 9px;border-radius:9px;font-size:15px;line-height:1.3;white-space:nowrap;color:var(--color-text);text-decoration:none;transition:background-color .2s,color .2s,transform .25s ease}
.rc-menu a span{min-width:0;overflow:hidden;text-overflow:ellipsis}
.rc-menu a i{flex:none;font-size:18px;color:var(--rc-orange);transition:transform .35s cubic-bezier(.3,1.6,.5,1)}
.rc-menu a i.i-ind{color:#2f9a3a}
.rc-menu a i.i-ea{color:var(--rc-blue)}
.rc-menu a:hover{background:#eaf3ff;color:var(--color-accent-700);transform:translateX(4px)}
.rc-menu a:hover i{transform:scale(1.18) rotate(-8deg)}
.rc-menu a[aria-current="page"]{background:#e1edff;color:var(--rc-blue-d);font-weight:600}
.rc-tag{margin-left:auto;flex:none;font-style:normal;font-size:11px;font-weight:600;padding:2px 8px;border-radius:999px;background:#e2f3df;color:var(--rc-green-d)}
.rc-group{display:flex;align-items:center;gap:8px;margin:8px 9px 4px;font-family:ui-monospace,monospace;font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--rc-orange-d)}
.rc-group::after{content:"";flex:1;height:1px;background:linear-gradient(90deg,#d9e2ef,transparent)}

.rc-new{display:block;color:inherit;text-decoration:none}
.rc-new-media{position:relative;display:block;aspect-ratio:16/10;border-radius:10px;overflow:hidden;background:#0b1020}
.rc-new-media img{width:100%;height:100%;object-fit:cover;transition:transform .7s cubic-bezier(.2,.7,.2,1)}
.rc-new:hover .rc-new-media img{transform:scale(1.07)}
.rc-badge-new{position:absolute;top:10px;left:10px;display:inline-flex;align-items:center;gap:4px;padding:5px 10px;border-radius:7px;font:700 13px/1 ui-monospace,monospace;letter-spacing:.14em;color:#fff;background:#e53935;animation:rc-blink .9s ease-in-out infinite}
.rc-new-name{display:block;margin:10px 0 3px;font-family:var(--font-heading);font-weight:600;font-size:17px;line-height:1.25;color:var(--rc-blue-d);transition:color .2s}
.rc-new:hover .rc-new-name{color:var(--rc-orange-d)}
.rc-new-meta{display:flex;flex-wrap:wrap;justify-content:space-between;gap:2px 10px;font-size:13px;color:var(--color-neutral-700)}
.rc-new-meta b{color:var(--rc-orange-d)}

.rc-feat{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.rc-feat a{position:relative;display:block;aspect-ratio:1;border-radius:10px;overflow:hidden;background:#0b1020;text-decoration:none}
.rc-feat img{width:100%;height:100%;object-fit:cover;transition:transform .7s cubic-bezier(.2,.7,.2,1)}
.rc-feat a:hover img{transform:scale(1.12)}
.rc-feat a>span{position:absolute;left:0;right:0;bottom:0;display:flex;align-items:center;gap:4px;min-width:0;padding:22px 7px 7px;font-size:12.5px;overflow-wrap:anywhere;font-weight:600;line-height:1.2;color:#fff;background:linear-gradient(180deg,transparent,rgba(9,22,48,.9))}
.rc-feat a>span i{flex:none;font-size:13px;color:#ffd166}
.rc-feat a::after{content:"";position:absolute;inset:0;border-radius:inherit;box-shadow:inset 0 0 0 2px transparent;transition:box-shadow .3s}
.rc-feat a:hover::after{box-shadow:inset 0 0 0 2px var(--rc-blue)}

/* ── Menu đầu trang ── */
.nav a.mnav{display:inline-flex;align-items:center;gap:9px;position:relative;border-bottom:0;padding:6px 0 9px;
  background:linear-gradient(90deg,#1e7a2b,#1976ea 50%,#b34a0a);background-size:200% 100%;
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;transition:background-position .5s ease}
.nav a.mnav:hover{background-position:100% 0}
.nav a.mnav i{font-size:24px;-webkit-text-fill-color:currentColor;transition:transform .35s cubic-bezier(.3,1.6,.5,1)}
.nav a.mnav:nth-child(1) i{color:var(--rc-green)}
.nav a.mnav:nth-child(2) i{color:var(--rc-orange)}
.nav a.mnav:nth-child(3) i{color:var(--rc-blue)}
.nav a.mnav:hover i{transform:translateY(-3px) rotate(-8deg) scale(1.12)}
.nav a.mnav::after{content:"";position:absolute;left:0;right:0;bottom:0;height:3px;border-radius:3px;background:linear-gradient(90deg,#3fa535,#f7941d,#1976ea);transform:scaleX(.3);transform-origin:left;transition:transform .35s ease}
.nav a.mnav:hover::after,.nav a.mnav:focus-visible::after{transform:scaleX(1)}
header img[src$="ruacoder-logo2.png"]{animation:rc-float 4.5s ease-in-out infinite}

/* ── Màu chữ ── */
.rc-layout main h1{font-size:clamp(36px,3.4vw,58px)!important;
  background:linear-gradient(90deg,#0e4592 0%,#1976ea 22%,#0fa3c7 42%,#2f9a3a 58%,#1976ea 78%,#0e4592 100%);background-size:200% auto;
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;animation:rc-flow 10s linear infinite}
.rc-layout main h2{width:fit-content;background:linear-gradient(90deg,#0e4592,#1976ea 55%,#0fa3c7);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.rc-layout main h3{color:var(--rc-blue-d)!important}
.rc-kicker{display:flex;align-items:center;gap:10px;color:var(--rc-orange-d)}
.rc-kicker::before{content:"";flex:none;width:8px;height:8px;border-radius:50%;background:var(--rc-orange);animation:rc-ping 2s ease-out infinite}
.rc-num{width:fit-content;background:linear-gradient(135deg,#2f9a3a,#1976ea);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.rc-price-big{width:fit-content;background:linear-gradient(135deg,#d9561a,#b03a12);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.rc-fire{font-size:14px;vertical-align:-2px;color:var(--rc-orange);display:inline-block;animation:rc-flicker 1.4s ease-in-out infinite}

/* ── Biểu tượng ── */
.btn{gap:8px;transition:transform .2s ease,box-shadow .2s ease,background-color .2s ease,color .2s ease,border-color .2s ease}
.btn i{font-size:17px}
.rc-ico{display:inline-grid;place-items:center;width:38px;height:38px;margin-right:12px;border-radius:11px;vertical-align:-7px;font-size:21px;color:#fff;
  background:linear-gradient(135deg,#1976ea,#0fa3c7);box-shadow:0 8px 16px -8px rgba(25,118,234,.75);transition:transform .4s cubic-bezier(.3,1.6,.5,1)}
.rc-ico.g{background:linear-gradient(135deg,#3fa535,#1e7a2b);box-shadow:0 8px 16px -8px rgba(47,154,58,.75)}
.rc-ico.o{background:linear-gradient(135deg,#f7941d,#e0601b);box-shadow:0 8px 16px -8px rgba(242,107,33,.75)}
.rc-svc:hover .rc-ico,h3:hover>.rc-ico{transform:rotate(-8deg) scale(1.1)}
.rc-stat i{display:block;font-size:30px;margin-bottom:8px;color:var(--rc-orange)}
.rc-stat:nth-child(2) i{color:var(--rc-green)}
.rc-stat:nth-child(3) i{color:var(--rc-blue)}
.rc-ci{display:inline-flex;align-items:center;gap:10px}
.rc-ci i{font-size:22px;color:var(--rc-blue)}
.rc-back{display:inline-flex;align-items:center;gap:6px;font-weight:600}
.rc-back i{transition:transform .25s ease}
.rc-back:hover i{transform:translateX(-4px)}
.rc-warn{font-size:17px;vertical-align:-3px;margin-right:4px}
.rc-lbl{font-size:16px;vertical-align:-2px;margin-right:2px}

/* ── Nút ── */
.btn-primary{position:relative;overflow:hidden;isolation:isolate;border:0;color:#fff;background:linear-gradient(135deg,#1976ea,#0fa3c7);box-shadow:0 8px 20px -10px rgba(25,118,234,.85)}
.btn-primary::after{content:"";position:absolute;top:0;bottom:0;left:0;width:40%;z-index:-1;background:linear-gradient(100deg,transparent,rgba(255,255,255,.5),transparent);transform:translateX(-130%) skewX(-20deg);animation:rc-shine 3.6s ease-in-out infinite}
.btn-primary:hover{background:linear-gradient(135deg,#1158c0,#0b8fb0);transform:translateY(-2px);box-shadow:0 12px 24px -10px rgba(25,118,234,.95)}
.btn-primary:active{transform:translateY(0)}
a.btn-primary,a.btn-primary:hover{color:#fff}
.btn-secondary{border-color:color-mix(in srgb,#1976ea 55%,transparent);color:var(--color-accent-700)}
.btn-secondary:hover{background:#eaf3ff;border-color:var(--rc-blue);color:var(--color-accent-700);transform:translateY(-2px)}
.btn-secondary:active{background:#cfe3ff;transform:translateY(0)}

/* ── Bảng danh mục ── */
.table thead tr{background:linear-gradient(90deg,#0e4592,#1976ea 55%,#0fa3c7)}
.table thead th{background:transparent!important;color:#fff;letter-spacing:.1em}
.table tbody tr.row-link td{transition:background-color .25s}
.table tbody tr.row-link td:first-child a{color:var(--rc-blue-d);transition:color .2s}
.table tbody tr.row-link:hover td:first-child a{color:var(--rc-orange-d)}
.rc-pill{display:inline-flex;align-items:center;gap:6px;padding:4px 11px 4px 9px;border-radius:999px;font-size:13px;font-weight:600;line-height:1.2}
.rc-pill i{font-size:15px}
.rc-pill-ind{background:#e2f3df;color:var(--rc-green-d)}
.rc-pill-ea{background:#e1edff;color:var(--color-accent-700)}
.rc-free i{color:var(--rc-green);margin-right:5px;vertical-align:-2px}
.rc-go{display:inline-flex;align-items:center;gap:4px;transition:gap .25s ease}
.row-link:hover .rc-go{gap:10px}

/* ── Ảnh ── */
.rc-layout main img{transition:transform .5s cubic-bezier(.2,.7,.2,1),filter .5s}
.rc-layout main img:hover{transform:translateY(-4px);filter:drop-shadow(0 16px 24px rgba(14,69,146,.28))}

/* ── Hiện dần khi cuộn ── */
.rc-js .rc-reveal{opacity:0}
.rc-js .rc-reveal.rc-in{animation:rc-up .8s cubic-bezier(.2,.7,.2,1) both}
.rc-js tr.rc-reveal.rc-in{animation-name:rc-fade}

@keyframes rc-flow{from{background-position:0% 50%}to{background-position:200% 50%}}
@keyframes rc-ping{0%{box-shadow:0 0 0 0 rgba(242,107,33,.55)}75%,100%{box-shadow:0 0 0 9px rgba(242,107,33,0)}}
@keyframes rc-float{0%,100%{transform:translateY(0)}50%{transform:translateY(-6px)}}
@keyframes rc-shine{0%,60%{transform:translateX(-130%) skewX(-20deg)}100%{transform:translateX(330%) skewX(-20deg)}}
@keyframes rc-blink{0%,100%{opacity:1;transform:scale(1);background:#e53935}50%{opacity:.35;transform:scale(.92);background:#f26b21}}
@keyframes rc-flicker{0%,100%{transform:scale(1) rotate(0)}50%{transform:scale(1.18) rotate(-6deg)}}
@keyframes rc-up{from{opacity:0;transform:translateY(22px)}to{opacity:1;transform:none}}
@keyframes rc-fade{from{opacity:0}to{opacity:1}}

@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}
@media print{
  .rc-side{display:none}.rc-layout{display:block}
  .rc-js .rc-reveal{opacity:1!important;animation:none!important}
}