/* =============================================================
   KIEMTIENTUWEB.COM — Home
   Chuyển từ file thiết kế kiem_tien_tu_web.png
   ============================================================= */

:root{
    --primary:#4b28da;
    --primary-600:#4321c9;
    --primary-700:#3617ac;
    --primary-050:#f1eefe;
    --money:#0e9f6e;

    --ink:#101426;
    --ink-2:#1d2436;
    --muted:#667085;
    --muted-2:#8b93a7;

    --line:#ecedf3;
    --line-2:#f3f4f8;
    --bg:#fcfcfe;
    --card:#ffffff;

    --radius:14px;
    --radius-sm:10px;
    --radius-xs:8px;

    --shadow-1:0 1px 2px rgba(16,24,40,.04);
    --shadow-2:0 6px 22px rgba(30,27,80,.07);
    --shadow-3:0 12px 34px rgba(30,27,80,.12);

    --container:1280px;
    --header-h:78px;
    --gap:22px;
}

*,*::before,*::after{box-sizing:border-box}

html{-webkit-text-size-adjust:100%}
body{
    margin:0;
    background:var(--bg);
    color:var(--ink);
    font-family:'Inter','Segoe UI',system-ui,-apple-system,'Helvetica Neue',Arial,sans-serif;
    font-size:14px;
    line-height:1.5;
    -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
h1,h2,h3{margin:0;font-weight:700;letter-spacing:-.01em}
p{margin:0}
ul{margin:0;padding:0;list-style:none}

svg{fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}

:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:6px}

.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 20px}

/* ------------------------------- buttons ------------------------------- */
.btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    height:38px;padding:0 16px;border:1px solid transparent;border-radius:9px;
    font-size:13.5px;font-weight:600;cursor:pointer;white-space:nowrap;
    transition:background .18s ease,color .18s ease,border-color .18s ease,box-shadow .18s ease,transform .18s ease;
}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--ink-2)}
.btn-ghost:hover{border-color:#dcd6fb;color:var(--primary);background:#fbfaff}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 6px 16px rgba(75,40,218,.22)}
.btn-primary:hover{background:var(--primary-600);box-shadow:0 8px 20px rgba(75,40,218,.3)}
.btn-primary:active{transform:translateY(1px)}
.btn-block{width:100%}

/* ================================ HEADER =============================== */
.site-header{
    position:sticky;top:0;z-index:60;
    background:rgba(255,255,255,.92);
    backdrop-filter:saturate(1.6) blur(8px);
    border-bottom:1px solid transparent;
    transition:border-color .2s ease,box-shadow .2s ease;
}
.site-header.is-stuck{border-bottom-color:var(--line);box-shadow:0 4px 18px rgba(16,24,40,.05)}

.header-inner{height:var(--header-h);display:flex;align-items:center;gap:18px}

.brand{flex:0 0 auto}
.brand img{width:168px;height:auto}

.main-nav{flex:1 1 auto;display:flex;justify-content:center}
.nav-list{display:flex;align-items:center;gap:5px}
.nav-item{position:relative}
.nav-link{
    display:inline-flex;align-items:center;gap:5px;
    height:36px;padding:0 11px;border:0;background:none;border-radius:8px;
    font-size:14px;font-weight:500;color:var(--ink-2);cursor:pointer;white-space:nowrap;
    transition:color .16s ease,background .16s ease;
}
.nav-link:hover{color:var(--primary);background:var(--primary-050)}
.nav-link .caret{width:12px;height:12px;stroke-width:1.8;color:var(--muted-2);transition:transform .18s ease}
.nav-item.is-open .nav-link{color:var(--primary);background:var(--primary-050)}
.nav-item.is-open .nav-link .caret{transform:rotate(180deg)}

.drop{
    position:absolute;top:calc(100% + 10px);left:50%;transform:translate(-50%,8px);
    min-width:208px;padding:8px;background:#fff;border:1px solid var(--line);
    border-radius:12px;box-shadow:var(--shadow-3);
    opacity:0;visibility:hidden;transition:opacity .18s ease,transform .18s ease,visibility .18s;
}
.nav-item.is-open .drop{opacity:1;visibility:visible;transform:translate(-50%,0)}
.drop a{display:block;padding:8px 10px;border-radius:8px;font-size:13.5px;color:var(--ink-2)}
.drop a:hover{background:var(--primary-050);color:var(--primary)}

.header-actions{flex:0 0 auto;display:flex;align-items:center;gap:10px}

.icon-btn{
    width:34px;height:34px;display:grid;place-items:center;
    border:0;background:none;border-radius:9px;color:var(--ink-2);cursor:pointer;
    transition:background .16s ease,color .16s ease;
}
.icon-btn svg{width:19px;height:19px}
.icon-btn:hover{background:var(--primary-050);color:var(--primary)}

.lang{position:relative}
.lang-btn{
    display:inline-flex;align-items:center;gap:6px;height:34px;padding:0 9px;
    border:0;background:none;border-radius:9px;font-size:13.5px;font-weight:600;
    color:var(--ink-2);cursor:pointer;transition:background .16s ease,color .16s ease;
}
.lang-btn:hover{background:var(--primary-050);color:var(--primary)}
.lang-btn .globe{width:17px;height:17px}
.lang-btn .caret{width:12px;height:12px;color:var(--muted-2);transition:transform .18s ease}
.lang.is-open .lang-btn{color:var(--primary);background:var(--primary-050)}
.lang.is-open .lang-btn .caret{transform:rotate(180deg)}

.lang-menu{
    position:absolute;top:calc(100% + 10px);right:0;min-width:168px;padding:7px;
    background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow-3);
    opacity:0;visibility:hidden;transform:translateY(8px);
    transition:opacity .18s ease,transform .18s ease,visibility .18s;
}
.lang.is-open .lang-menu{opacity:1;visibility:visible;transform:translateY(0)}
.lang-menu a{display:flex;align-items:center;gap:10px;padding:9px 10px;border-radius:8px;font-size:13.5px;font-weight:500}
.lang-menu a:hover{background:var(--primary-050);color:var(--primary)}
.lang-menu img{width:19px;height:auto;border-radius:2px}
.lang-menu a.is-active{color:var(--primary);font-weight:600}

.burger{display:none;width:38px;height:38px;border:1px solid var(--line);background:#fff;border-radius:9px;cursor:pointer;padding:0}
.burger span{display:block;width:16px;height:1.8px;margin:3px auto;background:var(--ink-2);border-radius:2px;transition:transform .2s ease,opacity .2s ease}
body.nav-open .burger span:nth-child(1){transform:translateY(4.8px) rotate(45deg)}
body.nav-open .burger span:nth-child(2){opacity:0}
body.nav-open .burger span:nth-child(3){transform:translateY(-4.8px) rotate(-45deg)}

/* header search drawer */
.header-search{
    display:grid;grid-template-rows:0fr;overflow:hidden;
    border-top:1px solid transparent;background:#fff;
    transition:grid-template-rows .25s ease,border-color .25s ease;
}
.header-search.is-open{grid-template-rows:1fr;border-top-color:var(--line)}
.header-search > .container{min-height:0}
.header-search-form{display:flex;gap:10px;padding:14px 0}
.header-search-form input{
    flex:1;height:42px;padding:0 14px;border:1px solid var(--line);border-radius:10px;
    background:#fbfbfe;font-size:14px;color:var(--ink);
}
.header-search-form input:focus{outline:none;border-color:#c9bcfa;background:#fff;box-shadow:0 0 0 4px rgba(75,40,218,.08)}
.header-search-form .btn{height:42px}

/* ================================= HERO ================================ */
.hero{
    position:relative;overflow:hidden;
    margin-top:20px;
    min-height:406px;
    border-radius:20px;
    background:linear-gradient(102deg,#fafbff 0%,#f4f6ff 34%,#e6eafe 68%,#cfd5fc 100%);
}
.hero-art{
    position:absolute;right:0;top:0;height:100%;width:58.5%;
    object-fit:cover;object-position:right center;
    -webkit-mask-image:linear-gradient(to right,transparent 0,#000 9%,#000 100%);
    mask-image:linear-gradient(to right,transparent 0,#000 9%,#000 100%);
    pointer-events:none;
}
.hero-copy{position:relative;z-index:2;max-width:520px;padding:62px 0 0 44px}
.hero-title{font-size:41px;line-height:1.24;font-weight:800;letter-spacing:-.022em;color:#0d1020}
.hero-title span{color:var(--primary)}
.hero-sub{margin-top:18px;font-size:14.5px;line-height:1.75;color:#5a6478}

.hero-search{display:flex;margin-top:24px;width:min(458px,100%);height:46px;border-radius:11px;background:#fff;box-shadow:0 8px 24px rgba(30,27,80,.09)}
.hero-search input{
    flex:1;min-width:0;height:100%;padding:0 16px;border:0;background:none;
    border-radius:11px 0 0 11px;font-size:13.5px;color:var(--ink);
}
.hero-search input::placeholder{color:#98a0b3}
.hero-search input:focus{outline:none}
.hero-search button{
    width:58px;border:0;border-radius:0 11px 11px 0;background:var(--primary);color:#fff;cursor:pointer;
    display:grid;place-items:center;transition:background .18s ease;
}
.hero-search button svg{width:19px;height:19px;stroke-width:1.9}
.hero-search button:hover{background:var(--primary-600)}

.hero-proof{display:flex;align-items:center;gap:12px;margin-top:26px}
.hero-proof img{width:88px;height:auto}
.hero-proof p{font-size:13px;color:#5a6478}
.hero-proof strong{color:var(--ink);font-weight:700}

/* =============================== PANEL ================================ */
.panel{
    background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
    padding:20px;box-shadow:var(--shadow-1);
}
.panel + .panel{margin-top:var(--gap)}
.panel-head{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:18px}
.panel-title{font-size:18px;font-weight:700;letter-spacing:-.018em}
.link-all{display:inline-flex;align-items:center;gap:5px;font-size:13px;font-weight:600;color:var(--primary)}
.link-all svg{width:14px;height:14px;transition:transform .18s ease}
.link-all:hover svg{transform:translateX(3px)}

/* ============================ TOPIC STRIP ============================= */
.topics{
    margin-top:var(--gap);
    display:grid;grid-template-columns:repeat(12,minmax(0,1fr));
    gap:6px;padding:18px 12px;
}
.topic{display:flex;flex-direction:column;align-items:center;gap:9px;padding:6px 2px;border-radius:12px;transition:background .18s ease,transform .18s ease}
.topic img{width:48px;height:48px;object-fit:contain}
.topic span{font-size:12px;font-weight:600;color:var(--ink-2);text-align:center;line-height:1.25}
.topic:hover{background:#f8f7ff;transform:translateY(-2px)}

/* ============================== LAYOUT ================================ */
.layout{
    display:grid;grid-template-columns:minmax(0,1fr) 357px;
    gap:20px;align-items:start;margin-top:var(--gap);padding-bottom:34px;
}
.col-main,.col-side{min-width:0}
.col-side .panel + .panel,
.col-side .newsletter + .panel,
.col-side .panel + .newsletter{margin-top:var(--gap)}

/* ============================== POSTS ================================= */
.post-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}
.post{min-width:0}
.post-thumb{position:relative;display:block;border-radius:10px;overflow:hidden;background:#f2f3f8;aspect-ratio:161/126}
.post-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .45s cubic-bezier(.2,.7,.3,1)}
.post-thumb:hover img{transform:scale(1.045)}
/* badge dùng khi thay thumbnail bằng ảnh từ database (thiết kế gốc badge nằm trong ảnh) */
.post-badge,.case-badge{
    position:absolute;top:10px;left:10px;z-index:2;
    padding:4px 10px;border-radius:6px;background:var(--primary);color:#fff;
    font-size:10.5px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;
    box-shadow:0 3px 10px rgba(16,24,40,.2);
}
.case-badge{top:8px;left:8px}
.case-badge.is-blog{background:#ef4444}
.case-badge.is-adsense{background:#2563eb}
.case-badge.is-affiliate{background:#16a34a}
.case-badge.is-youtube{background:#dc2626}

.post-title{margin-top:13px;font-size:14px;font-weight:600;line-height:1.5;letter-spacing:-.008em;color:var(--ink)}
.post-title a:hover{color:var(--primary)}
.post-meta{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:12px;font-size:11.5px;color:var(--muted)}
.post-meta .author{display:inline-flex;align-items:center;gap:6px;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.post-meta .author img{width:18px;height:18px;border-radius:50%;object-fit:cover;flex:0 0 auto}
.post-meta .time{flex:0 0 auto;color:var(--muted-2)}

/* ============================== PROMPTS =============================== */
.prompt-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:13px}
.prompt{
    display:flex;flex-direction:column;gap:10px;padding:13px;
    border:1px solid var(--line);border-radius:11px;background:#fff;
    transition:border-color .18s ease,box-shadow .18s ease,transform .18s ease;
}
.prompt:hover{border-color:#d8cffb;box-shadow:var(--shadow-2);transform:translateY(-2px)}
.prompt-head{display:flex;align-items:flex-start;gap:9px}
.prompt-head img{width:26px;height:26px;flex:0 0 auto;object-fit:contain}
.prompt-head b{font-size:12.5px;font-weight:700;line-height:1.32;color:var(--ink)}
.prompt p{font-size:12px;line-height:1.55;color:var(--muted)}
.prompt-foot{display:inline-flex;align-items:center;gap:5px;margin-top:auto;padding-top:2px;font-size:11px;color:var(--muted-2)}
.prompt-foot svg{width:13px;height:13px}

/* ============================ CASE STUDY ============================== */
.case-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.case{
    display:flex;flex-direction:column;overflow:hidden;
    border:1px solid var(--line);border-radius:11px;background:#fff;
    transition:border-color .18s ease,box-shadow .18s ease,transform .18s ease;
}
.case:hover{border-color:#d8cffb;box-shadow:var(--shadow-2);transform:translateY(-2px)}
.case-thumb{display:block;aspect-ratio:158/80;overflow:hidden;background:#eef0f6}
.case-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .45s cubic-bezier(.2,.7,.3,1)}
.case-thumb:hover img{transform:scale(1.05)}
.case-title{padding:12px 12px 0;font-size:13px;font-weight:700;line-height:1.48;letter-spacing:-.006em}
.case-title a:hover{color:var(--primary)}
.case-stats{display:grid;grid-template-columns:1fr 1fr;gap:8px;padding:12px}
.case-stats div{display:flex;flex-direction:column;gap:2px}
.case-stats b{font-size:14.5px;font-weight:800;letter-spacing:-.02em;color:var(--ink)}
.case-stats b.money{color:var(--money)}
.case-stats span{font-size:10.5px;color:var(--muted-2)}
.case-author{display:flex;align-items:center;gap:7px;margin-top:auto;padding:10px 12px;border-top:1px solid var(--line-2);font-size:11.5px;color:var(--muted)}
.case-author img{width:17px;height:17px;border-radius:50%;object-fit:cover}

/* ============================= RESOURCES ============================== */
.res-grid{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:13px}
.res{
    display:flex;flex-direction:column;align-items:center;gap:7px;
    padding:16px 10px 13px;border:1px solid var(--line);border-radius:11px;background:#fff;text-align:center;
    transition:border-color .18s ease,box-shadow .18s ease,transform .18s ease;
}
.res:hover{border-color:#d8cffb;box-shadow:var(--shadow-2);transform:translateY(-2px)}
.res img{width:34px;height:34px;object-fit:contain}
.res b{font-size:12.5px;font-weight:700;color:var(--ink);line-height:1.3}
.res p{font-size:11px;line-height:1.45;color:var(--muted)}
.res-dl{display:inline-flex;flex-direction:column;align-items:center;gap:3px;margin-top:4px;font-size:11.5px;font-weight:600;color:var(--primary)}
.res-dl svg{width:13px;height:13px}

/* ============================== SIDEBAR =============================== */
.tool-list li + li,
.course-list li + li{border-top:1px solid var(--line-2)}
.tool-list a{display:flex;align-items:center;gap:12px;padding:11px 0}
.tool-list img{width:34px;height:34px;flex:0 0 auto;object-fit:contain}
.tool-list span{display:flex;flex-direction:column;gap:2px;min-width:0;flex:1}
.tool-list b{font-size:13.5px;font-weight:700;color:var(--ink);letter-spacing:-.008em}
.tool-list em{font-size:11.5px;font-style:normal;color:var(--muted)}
.tool-list .chev{width:15px;height:15px;flex:0 0 auto;color:var(--muted-2);transition:transform .18s ease,color .18s ease}
.tool-list a:hover b{color:var(--primary)}
.tool-list a:hover .chev{color:var(--primary);transform:translateX(3px)}

.course-list a{display:flex;align-items:center;gap:12px;padding:11px 0}
.course-list img{width:60px;height:52px;flex:0 0 auto;object-fit:cover;border-radius:8px;background:#eef0f6}
.course-list span{display:flex;flex-direction:column;gap:3px;min-width:0;flex:1}
.course-list b{font-size:13px;font-weight:700;color:var(--ink);letter-spacing:-.008em}
.course-list em{font-size:11.5px;font-style:normal;line-height:1.4;color:var(--muted)}
.course-list .price{flex:0 0 auto;font-size:12.5px;font-style:normal;font-weight:700;color:var(--primary)}
.course-list a:hover b{color:var(--primary)}

/* ============================ NEWSLETTER ============================== */
.newsletter{
    padding:22px 18px 18px;border-radius:var(--radius);border:1px solid #e4dffc;
    background:linear-gradient(170deg,#efecfe 0%,#f1effe 55%,#f3f3fd 100%);
    text-align:center;
}
.newsletter h2{font-size:18px;font-weight:700;color:#2f1aa8;letter-spacing:-.018em}
.newsletter p{margin-top:9px;font-size:12.5px;line-height:1.65;color:#5f6480}
.newsletter-form{margin-top:16px}
.newsletter-form input{
    width:100%;height:44px;padding:0 14px;border:1px solid #e0dafb;border-radius:10px;
    background:#fff;font-size:13.5px;color:var(--ink);
}
.newsletter-form input::placeholder{color:#9aa0b6}
.newsletter-form input:focus{outline:none;border-color:#bfb0f8;box-shadow:0 0 0 4px rgba(75,40,218,.09)}
.newsletter-form .btn{height:44px;margin-top:11px;border-radius:10px;font-size:14px}
.newsletter-note{display:block;margin-top:12px;font-size:11px;color:#8b90a8}
.newsletter-msg{display:block;margin-top:10px;font-size:12px;font-weight:600;color:var(--money)}

/* =============================== FOOTER =============================== */
.site-footer{border-top:1px solid var(--line);background:#fff}
.footer-top{
    display:grid;grid-template-columns:1.65fr 1fr 1.1fr 1.5fr .95fr;
    gap:28px;padding:34px 0 30px;
}
.footer-brand img{width:168px;height:auto}
.footer-brand p{margin-top:14px;max-width:270px;font-size:12.5px;line-height:1.7;color:var(--muted)}
.footer-social{display:flex;gap:8px;margin-top:16px}
.footer-social a{display:block;border-radius:50%;transition:transform .18s ease,box-shadow .18s ease}
.footer-social img{width:26px;height:26px}
.footer-social a:hover{transform:translateY(-2px);box-shadow:0 6px 14px rgba(30,27,80,.16)}

.footer-col h3{font-size:14px;font-weight:700;letter-spacing:-.01em}
.footer-col ul{margin-top:14px;display:flex;flex-direction:column;gap:10px}
.footer-col a{font-size:12.5px;color:var(--muted)}
.footer-col a:hover{color:var(--primary)}
.footer-contact li{display:flex;align-items:flex-start;gap:8px;font-size:12.5px;color:var(--muted)}
.footer-contact svg{width:15px;height:15px;flex:0 0 auto;margin-top:2px;color:var(--muted-2)}
.footer-stats li{display:flex;align-items:center;justify-content:space-between;gap:14px;font-size:12.5px;color:var(--muted)}
.footer-stats b{font-weight:700;color:var(--ink)}

.footer-bottom{border-top:1px solid var(--line-2);padding:16px 0 20px}
.footer-bottom p{font-size:12px;color:var(--muted-2)}

/* ============================== TO TOP ================================ */
.to-top{
    position:fixed;right:22px;bottom:22px;z-index:70;
    width:42px;height:42px;display:grid;place-items:center;
    border:0;border-radius:50%;background:var(--primary);color:#fff;cursor:pointer;
    box-shadow:0 10px 24px rgba(75,40,218,.34);
    opacity:0;visibility:hidden;transform:translateY(10px);
    transition:opacity .22s ease,transform .22s ease,visibility .22s,background .18s ease;
}
.to-top svg{width:19px;height:19px;stroke-width:2}
.to-top.is-visible{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--primary-600)}

/* ============================== REVEAL ================================ */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .55s ease,transform .55s ease}
.reveal.is-in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
    *{animation:none!important;transition-duration:.01ms!important}
    .reveal{opacity:1;transform:none}
}

/* ============================ RESPONSIVE ============================== */
@media (max-width:1280px){
    .hero-copy{max-width:470px;padding-left:34px}
    .hero-title{font-size:37px}
}

@media (max-width:1180px){
    .burger{display:block}
    .main-nav{
        position:absolute;left:0;right:0;top:100%;
        display:block;padding:10px 20px 18px;background:#fff;
        border-bottom:1px solid var(--line);box-shadow:0 18px 30px rgba(16,24,40,.08);
        max-height:calc(100vh - var(--header-h));overflow:auto;
        opacity:0;visibility:hidden;transform:translateY(-8px);
        transition:opacity .2s ease,transform .2s ease,visibility .2s;
    }
    body.nav-open .main-nav{opacity:1;visibility:visible;transform:none}
    .nav-list{display:block}
    .nav-link{width:100%;justify-content:space-between;height:44px;padding:0 8px;font-size:15px}
    .drop{
        position:static;transform:none;opacity:1;visibility:visible;display:none;
        min-width:0;margin:2px 0 6px;padding:4px 0 4px 10px;border:0;border-left:2px solid var(--primary-050);
        border-radius:0;box-shadow:none;
    }
    .nav-item.is-open .drop{display:block;transform:none}
    .header-actions .btn-ghost{display:none}
    .hero-art{width:52%;opacity:.9}
    .hero-copy{max-width:58%}
}

@media (max-width:1080px){
    .layout{grid-template-columns:minmax(0,1fr)}
    .col-side{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;align-items:start}
    .col-side .panel + .panel,
    .col-side .newsletter + .panel,
    .col-side .panel + .newsletter{margin-top:0}
    .col-side .newsletter{grid-column:1/-1;order:3}
    .topics{grid-template-columns:repeat(6,minmax(0,1fr));gap:10px}
    .res-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
    .prompt-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
    .footer-top{grid-template-columns:1fr 1fr 1fr;gap:26px}
    .footer-brand{grid-column:1/-1}
}

@media (max-width:860px){
    .hero{min-height:0}
    .hero-art{
        position:relative;width:100%;height:auto;
        -webkit-mask-image:none;mask-image:none;
    }
    .hero-copy{max-width:none;padding:34px 24px 8px}
    .hero-title{font-size:32px}
    .post-grid,.case-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
    .footer-top{grid-template-columns:1fr 1fr}
}

@media (max-width:620px){
    :root{--header-h:64px;--gap:16px}
    .container{padding:0 14px}
    .brand img{width:140px}
    .header-actions{gap:6px}
    .lang-btn span{display:none}
    .hero{border-radius:16px}
    .hero-title{font-size:27px}
    .hero-sub{font-size:13.5px}
    .hero-sub br{display:none}
    .panel{padding:16px 14px}
    .panel-title{font-size:16.5px}
    .topics{grid-template-columns:repeat(3,minmax(0,1fr))}
    .post-grid{gap:16px}
    .prompt-grid,.res-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
    .col-side{grid-template-columns:minmax(0,1fr)}
    .footer-top{grid-template-columns:1fr;gap:22px;padding-top:26px}
    .to-top{right:14px;bottom:14px}
}

@media (max-width:420px){
    .post-grid,.case-grid{grid-template-columns:minmax(0,1fr)}
}