/* =====================================================================
   UI v3: header Categories menu, Practice (Learning vs Editing tools),
   Home polish, admin serial numbers. Loaded after ui-v2.css.
   ===================================================================== */
:root{--teal:#0d9488;--teal-d:#0f3d44;--ink:#0a1a3a}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------- Header: Categories dropdown ---------- */
.dd-t .caret{font-size:11px;opacity:.8;display:inline-block;transition:transform .15s}.dd.open .caret{transform:rotate(180deg)}
.dd-m{min-width:640px;grid-template-columns:repeat(3,1fr);gap:6px 22px;padding:18px 20px 12px;z-index:70;border-top:3px solid var(--acc)}
.dd.open .dd-m,.dd:focus-within .dd-m{display:grid}
.dd-g a{padding:5px 0}.dd-g a.dd-h{padding:7px 10px;margin:0 -10px;border-radius:8px}.dd-g a.dd-h:hover{background:#eef5ff}
.dd-all{grid-column:1/-1;margin-top:6px;padding:10px 0 4px!important;border-top:1px solid #edf1f9;color:var(--blue)!important;font-weight:700;font-size:14px}
.dd-empty{grid-column:1/-1;margin:0;color:var(--mut)}
@media(max-width:768px){.dd-m{min-width:0;grid-template-columns:1fr;padding:8px 18px 14px;border-top:0}.dd-m{display:none}.dd.open .dd-m{display:grid}.dd:hover .dd-m{display:none}.dd.open:hover .dd-m{display:grid}.dd-g a.dd-h:hover{background:rgba(255,255,255,.08)}.dd-all{color:var(--acc)!important;border-color:rgba(255,255,255,.15)}}

/* ---------- Section headers ---------- */
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;margin-bottom:20px}.sec-head h2{margin:0!important}
.sec-more{font-weight:700;font-size:14px;color:var(--blue);white-space:nowrap;padding:6px 12px;border-radius:20px;background:#eef5ff}.sec-more:hover{background:var(--blue);color:#fff}
.sec-sub{margin:-8px 0 18px;max-width:760px;color:var(--mut)}

/* ---------- Home: stats strip ---------- */
.hstats{background:#fff;border-bottom:1px solid #e8eefb;box-shadow:0 6px 18px rgba(11,31,75,.05)}
.hstats-g{display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.hstats-g a{display:flex;flex-direction:column;align-items:center;text-align:center;padding:18px 10px;border-right:1px solid #eef1f7;transition:background .15s}.hstats-g a:last-child{border:0}.hstats-g a:hover{background:#f4f8ff}
.hstats-g b{font-size:clamp(24px,3.4vw,32px);color:var(--blue);line-height:1.1;letter-spacing:-.5px}.hstats-g span{font-size:13px;color:var(--mut);margin-top:3px}
@media(max-width:700px){.hstats-g{grid-template-columns:1fr 1fr}.hstats-g a:nth-child(2){border-right:0}.hstats-g a:nth-child(-n+2){border-bottom:1px solid #eef1f7}}

/* slider: a little taller and cleaner */
.hero .slide{padding:72px 0}.hero .slide.bg::before{background:linear-gradient(90deg,rgba(11,31,75,.92),rgba(11,31,75,.45) 60%,rgba(11,31,75,.2))}
.hero .slide h1,.hero .slide h2{font-size:clamp(26px,4.4vw,46px);line-height:1.15;max-width:720px;margin:0 0 10px;text-shadow:0 2px 12px rgba(0,0,0,.25)}
.hero .slide .btn{padding:12px 24px;font-size:16px;box-shadow:0 6px 16px rgba(0,0,0,.2)}
@media(max-width:700px){.hero .slide{padding:44px 0 52px}}

/* ---------- Tool cards ---------- */
.tc-top{display:flex;justify-content:space-between;align-items:flex-start;gap:8px}
.tc-badges{display:flex;flex-wrap:wrap;gap:4px;justify-content:flex-end}
.tc-b{font:700 10.5px/1 system-ui,sans-serif;letter-spacing:.3px;text-transform:uppercase;padding:5px 8px;border-radius:20px;background:#e7f7ec;color:#157a3c}
/* Learning = bright blue/gold */
.tc-learning{border-top:4px solid var(--blue)}
.tc-learning .ticon{background:linear-gradient(135deg,#e3efff,#fff4dc)}
.tc-learning .btn{background:var(--blue)}
/* Editing = dark teal "workshop" look */
.tc-editing{background:linear-gradient(160deg,#0f2f3a,#123f4a);border:1px solid rgba(255,255,255,.1);border-top:4px solid #2dd4bf;color:#d7f3ef}
.tc-editing h3{color:#fff}.tc-editing p,.tc-editing p.mut{color:#a9d4cf}
.tc-editing .ticon{background:rgba(45,212,191,.14);border:1px solid rgba(45,212,191,.35)}
.tc-editing .tc-b{background:rgba(45,212,191,.16);color:#7ff0df}
.tc-editing .btn{background:#2dd4bf;border-color:#2dd4bf;color:#06302b}
.tc-editing:hover{box-shadow:0 12px 30px rgba(13,148,136,.35)}

/* ---------- Practice page ---------- */
.pr-hero{background:radial-gradient(circle at 90% 10%,rgba(45,212,191,.22),transparent 40%),radial-gradient(circle at 5% 100%,rgba(22,119,255,.4),transparent 45%),linear-gradient(120deg,#0B1F4B,#14409a);color:#fff;padding:44px 0 40px}
.pr-hero h1{margin:0 0 10px;font-size:clamp(28px,4.6vw,44px);line-height:1.15}.pr-hero p{max-width:740px;color:#d6e4ff;font-size:clamp(15px,2vw,18px);margin:0 0 16px}
.pr-pills{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px}.pr-pills span{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);padding:6px 13px;border-radius:30px;font-size:13.5px;font-weight:600}
.pr-tools{display:flex;gap:12px;flex-wrap:wrap;align-items:stretch}
.pr-tab{display:flex;align-items:center;gap:12px;padding:12px 18px;border-radius:14px;color:#fff;font-weight:700;transition:transform .15s}.pr-tab:hover{transform:translateY(-2px)}
.pr-tab b{font-size:28px;line-height:1}.pr-tab.learn{background:linear-gradient(135deg,#1677FF,#3b8bff)}.pr-tab.edit{background:linear-gradient(135deg,#0d9488,#14b8a6)}
.pr-search{flex:1;min-width:240px;display:flex;align-items:center;margin:0}.pr-search input{width:100%;margin:0;padding:15px 18px;border:0;border-radius:14px;font-size:16px}
.pr-pg{padding-top:34px}
.tg{margin-bottom:42px;scroll-margin-top:calc(var(--hdr-h) + 16px)}
.tg-head{display:flex;gap:14px;align-items:center;margin-bottom:20px}.tg-head h2{margin:0 0 2px;color:var(--navy);font-size:clamp(21px,3vw,28px)}.tg-head p{margin:0;max-width:720px}
.tg-ic{width:52px;height:52px;flex:0 0 52px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:26px;background:#e3efff}
.tg-edit{background:linear-gradient(160deg,#0a2530,#0f3d44);padding:28px;border-radius:22px;color:#cfeee9;box-shadow:0 14px 40px rgba(10,37,48,.25)}
.tg-edit .tg-head h2{color:#fff}.tg-edit .tg-head p{color:#9fd0ca}.tg-edit .tg-ic{background:rgba(45,212,191,.18)}
.tg-edit .tc-editing{background:rgba(255,255,255,.06);backdrop-filter:blur(2px)}
.trust-row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:22px}
.trust-row div{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12);border-radius:14px;padding:14px 16px}.trust-row b{display:block;color:#fff;margin-bottom:3px}.trust-row span{font-size:13.5px;color:#9fd0ca}
@media(max-width:700px){.trust-row{grid-template-columns:1fr}.tg-edit{padding:18px 14px;border-radius:16px}.pr-hero{padding:30px 0 28px}.pr-tab{flex:1 1 100%}}

/* ---------- Tool page: badges + privacy panel ---------- */
.tp-badges{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 16px}.tp-badges span{font-size:13px;font-weight:700;padding:6px 12px;border-radius:30px;background:#e7f7ec;color:#157a3c}
.tp-badges.tp-editing span{background:#d9f7f2;color:#0b6b61}
.privacy{padding:24px 26px}.privacy h2{margin:0 0 16px;color:var(--navy);font-size:22px}
.pv-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px}
.pv{display:flex;gap:12px;padding:14px;border-radius:14px;background:#f4f8ff;border:1px solid #e3ecfb}.pv b{color:var(--navy)}.pv p{margin:3px 0 0;font-size:14px;line-height:1.6;color:#4a5878}
.pv-i{font-size:24px;line-height:1.2}
.privacy.tp-editing{border-top:4px solid #14b8a6}.privacy.tp-editing .pv{background:#effcfa;border-color:#c9efe9}
.privacy.tp-learning{border-top:4px solid var(--blue)}

/* ---------- Home: dark editing-tools band ---------- */
.sec-edit_tools{background:linear-gradient(160deg,#0a2530,#0f3d44);margin-top:36px;padding:44px 0 40px;color:#cfeee9}
.sec-edit_tools .sec-head h2{color:#fff}.sec-edit_tools .sec-more{background:rgba(255,255,255,.12);color:#7ff0df}.sec-edit_tools .sec-more:hover{background:#2dd4bf;color:#06302b}
.sec-edit_tools .sec-sub{color:#9fd0ca}.sec-edit_tools .tc-editing{background:rgba(255,255,255,.06)}
.sec-tools{padding-top:44px}
.sec-why .why-c{border:1px solid #edf1f9;transition:transform .15s}.sec-why .why-c:hover{transform:translateY(-3px)}
.sec-about .about{box-shadow:var(--sh)}

/* ---------- Admin: serial numbers ---------- */
.sn{color:var(--mut);font-weight:700}
table.t th.sn,table.t td.sn{width:46px;text-align:center;color:var(--mut);font-weight:700;background:#f7f9fc}
.mrow .sn{flex:0 0 30px;height:30px;border-radius:50%;background:#eef2fb;display:inline-flex;align-items:center;justify-content:center;font-size:13px;color:var(--navy)}
table.t tr:hover td{background:#fafcff}

/* keep the new tool cards stacked on phones (overrides the compact row layout from ui-v2) */
.tools-grid .tcard[class*="tc-"]{display:flex;flex-direction:column;padding:18px;align-items:stretch}
.tools-grid .tcard[class*="tc-"] .tc-top .ticon{grid-row:auto;width:52px;height:52px;flex:0 0 52px}
.tools-grid .tcard[class*="tc-"] .btn{align-self:flex-start;width:auto;margin-top:8px}
@media(max-width:560px){.tools-grid .tcard[class*="tc-"] .btn{align-self:stretch;width:100%}}
.tools-grid .tcard[class*="tc-"]>h3,.tools-grid .tcard[class*="tc-"]>p{grid-column:auto}
.tools-grid .tcard.tc-editing .ticon{background:rgba(45,212,191,.14)}
.tools-grid .tcard.tc-learning .ticon{background:linear-gradient(135deg,#e3efff,#fff4dc)}

/* ---------- MCQ hub page ---------- */
.mh-intro{background:radial-gradient(circle at 92% 0,rgba(255,178,26,.22),transparent 40%),linear-gradient(120deg,#0B1F4B,#14409a);color:#fff;padding:38px 0}
.mh-intro-g{display:grid;grid-template-columns:1.4fr 1fr;gap:28px;align-items:center}
.mh-eye{display:inline-block;background:rgba(255,178,26,.18);color:#ffc94d;border:1px solid rgba(255,178,26,.4);padding:5px 12px;border-radius:30px;font-size:12.5px;font-weight:700;margin-bottom:12px}
.mh-intro h1{margin:0 0 10px;font-size:clamp(26px,4.2vw,40px);line-height:1.18}.mh-intro p{margin:0;color:#d6e4ff;font-size:clamp(15px,2vw,17px);max-width:620px}
.mh-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.mh-stats div{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);border-radius:14px;padding:14px 10px;text-align:center}
.mh-stats b{display:block;font-size:clamp(20px,3vw,26px);color:#ffc94d}.mh-stats span{font-size:12.5px;color:#d6e4ff}
.mh-pg{padding-top:34px}
.mh-banks{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-bottom:38px}
.mh-bank{position:relative;display:flex;flex-direction:column;gap:6px;padding:24px 22px;border-radius:20px;color:#fff;overflow:hidden;box-shadow:0 10px 26px rgba(11,31,75,.18);transition:transform .18s,box-shadow .18s}
.mh-bank:hover{transform:translateY(-4px);box-shadow:0 16px 34px rgba(11,31,75,.28)}
.mh-bank::after{content:"";position:absolute;right:-40px;top:-40px;width:140px;height:140px;border-radius:50%;background:rgba(255,255,255,.1)}
.mb0{background:linear-gradient(135deg,#1456d8,#3b8bff)}.mb1{background:linear-gradient(135deg,#0d9488,#2bc3b2)}.mb2{background:linear-gradient(135deg,#d9480f,#f59f00)}
.mh-bank .mh-ic{width:56px;height:56px;border-radius:16px;background:rgba(255,255,255,.95);display:flex;align-items:center;justify-content:center;font-size:30px;margin-bottom:6px;position:relative;z-index:1}
.mh-bank h3{margin:0;font-size:21px;position:relative;z-index:1}.mh-bank p{margin:0;color:rgba(255,255,255,.92);font-size:14.5px;line-height:1.55;position:relative;z-index:1;flex:1}
.mh-go{font-weight:700;font-size:14.5px;position:relative;z-index:1;margin-top:8px}.mh-bank .mh-go{background:rgba(255,255,255,.2);align-self:flex-start;padding:8px 14px;border-radius:10px}
.mh-meta{font-size:12.5px;font-weight:700;opacity:.9}
.mh-search{display:grid;grid-template-columns:1fr 1.3fr;gap:22px;align-items:center;background:#fff;border:1px solid #e3ecfb;border-left:6px solid var(--acc);border-radius:20px;padding:26px 28px;margin-bottom:38px;box-shadow:var(--sh)}
.mh-search h2{margin:0 0 4px;color:var(--navy);font-size:clamp(19px,2.6vw,24px)}.mh-search p{margin:0;color:var(--mut)}
.mh-search .mcq-search{max-width:none}.mh-search .mcq-search input{border:2px solid #dbe5f7;background:#f8fbff}
.mh-chips{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:12px;font-size:13.5px;color:var(--mut)}.mh-chips a{background:#eef5ff;color:var(--blue);padding:5px 12px;border-radius:20px;font-weight:600}.mh-chips a:hover{background:var(--blue);color:#fff}
.mh-learn{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:38px}
.mh-lc{display:flex;gap:14px;background:#fff;border:1px solid #edf1f9;border-left:5px solid #7c3aed;border-radius:16px;padding:18px;box-shadow:var(--sh);transition:transform .15s}.mh-lc:hover{transform:translateY(-3px)}
.mh-lc .mh-ic{flex:0 0 50px;height:50px;border-radius:14px;background:#f1eaff;display:flex;align-items:center;justify-content:center;font-size:26px}
.mh-lc h3{margin:0 0 4px;color:var(--navy);font-size:17px}.mh-lc p{margin:0 0 8px;color:var(--mut);font-size:14px}.mh-lc .mh-go{color:#6d28d9;margin:0}.mh-lc em{font-style:normal;background:#f1eaff;padding:2px 8px;border-radius:12px;font-size:12px;margin-left:6px}
.mh-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:38px}
.mh-steps div{background:#fff;border:1px solid #edf1f9;border-radius:16px;padding:20px;position:relative}
.mh-steps b{width:36px;height:36px;border-radius:50%;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;margin-bottom:10px}
.mh-steps h3{margin:0 0 4px;color:var(--navy);font-size:17px}.mh-steps p{margin:0;color:var(--mut);font-size:14px}
@media(max-width:900px){.mh-intro-g{grid-template-columns:1fr}.mh-banks,.mh-learn,.mh-steps{grid-template-columns:1fr}.mh-search{grid-template-columns:1fr;padding:20px}}

/* ---------- Tool cards v2: equal height, short text, stretched link ---------- */
.tools-grid .tcard[class*="tc-"]{position:relative;gap:0}
.tcard h3{margin:14px 0 6px;font-size:18px;line-height:1.3;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:2.6em}
.tcard h3 a{color:inherit}.tc-link::after{content:"";position:absolute;inset:0;z-index:1;border-radius:inherit}
.tcard .tc-short,.tcard .tc-full{margin:0 0 6px;font-size:14px;line-height:1.55;color:var(--mut)}.tc-editing .tc-short,.tc-editing .tc-full{color:#a9d4cf}
.tcard .tc-short{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;min-height:4.65em}
.tc-more{position:relative;z-index:2;align-self:flex-start;background:none;border:0;padding:2px 0;margin-bottom:6px;font-weight:700;font-size:13px;color:var(--blue);cursor:pointer}
.tc-editing .tc-more{color:#7ff0df}
.tools-grid .tcard[class*="tc-"] .tc-btn{position:relative;z-index:2;margin-top:auto}.tcard .tc-full:not([hidden])+.tc-more{margin-top:0}
.tc-learning:hover,.tc-editing:hover{transform:translateY(-3px)}
/* Home: exactly 5 cards per group */
.tools-5{grid-template-columns:repeat(5,minmax(0,1fr))}
@media(max-width:1100px){.tools-5{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:700px){.tools-5{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.tools-5 .tcard{padding:14px!important}.tools-5 .tc-b:nth-child(2){display:none}}
@media(max-width:430px){.tools-5{grid-template-columns:1fr}}

/* ---------- MCQ: Learn English cards v2 ---------- */
.mh-learn{gap:18px}
.mh-lc{flex-direction:column;gap:0;padding:0;border:1px solid #e6dcfb;border-left:1px solid #e6dcfb;overflow:hidden;border-radius:20px}
.mh-lc-top{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:18px 20px;color:#fff;background:linear-gradient(135deg,#6d28d9,#a855f7)}
.lc1 .mh-lc-top{background:linear-gradient(135deg,#4338ca,#6366f1)}.lc2 .mh-lc-top{background:linear-gradient(135deg,#be185d,#ec4899)}
.mh-lc .mh-ic{flex:0 0 54px;width:54px;height:54px;background:#fff;border-radius:16px;font-size:28px}
.mh-lc-n{font-weight:800;font-size:15px;background:rgba(255,255,255,.2);padding:6px 12px;border-radius:20px}
.mh-lc-b{display:flex;flex-direction:column;flex:1;padding:18px 20px 20px}
.mh-lc h3{font-size:19px}.mh-lc p{flex:1;font-size:14.5px;line-height:1.6}
.mh-lc .mh-go{align-self:flex-start;background:#f1eaff;color:#6d28d9;padding:9px 16px;border-radius:10px}.lc1 .mh-go{background:#e8eaff;color:#4338ca}.lc2 .mh-go{background:#ffe6f1;color:#be185d}
.mh-lc:hover .mh-go{background:#6d28d9;color:#fff}.lc1:hover .mh-go{background:#4338ca}.lc2:hover .mh-go{background:#be185d}
.mh-search{margin-top:0}
.tcard [hidden]{display:none!important}
.tools-5 .tc-b:nth-child(2){display:none}
.tools-5 .tc-badges{flex-wrap:nowrap}
.tcard .tc-full{display:block;-webkit-line-clamp:unset;line-clamp:unset;overflow:visible;max-height:none}

/* ---------- Free Tutorials ---------- */
.cs-hero,.tu-hero{background:radial-gradient(circle at 90% 0,rgba(255,178,26,.2),transparent 40%),linear-gradient(120deg,#0B1F4B,#14409a);color:#fff;padding:36px 0}
.cs-hero h1,.tu-hero h1{margin:0 0 8px;font-size:clamp(26px,4.2vw,40px)}.cs-hero p,.tu-hero p{margin:0;max-width:680px;color:#d6e4ff;font-size:clamp(15px,2vw,17px)}
.cs-perks{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}.cs-perks span{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);padding:6px 13px;border-radius:30px;font-size:13.5px;font-weight:600}
.tu-strip{margin-top:44px;padding:26px;border-radius:22px;background:linear-gradient(160deg,#f1f6ff,#fff);border:1px solid #e3ecfb}
.tu-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:18px}
.tu-card{display:flex;flex-direction:column;background:#fff;border:1px solid #e6edf8;border-radius:18px;overflow:hidden;box-shadow:var(--sh);transition:transform .15s,box-shadow .15s}.tu-card:hover{transform:translateY(-4px);box-shadow:0 14px 30px rgba(11,31,75,.16)}
.tu-cov{position:relative;aspect-ratio:16/9;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;background:linear-gradient(135deg,#1456d8,#7c3aed);color:#fff;text-align:center;padding:12px}
.tu-card:nth-child(3n+2) .tu-cov{background:linear-gradient(135deg,#0d9488,#2563eb)}.tu-card:nth-child(3n) .tu-cov{background:linear-gradient(135deg,#d9480f,#be185d)}
.tu-cov img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}.tu-ic{font-size:40px;line-height:1}.tu-cov b{font-size:18px}
.tu-body{display:flex;flex-direction:column;gap:6px;padding:16px 18px 18px;flex:1}.tu-body h3{margin:0;color:var(--navy);font-size:18px}.tu-body p{margin:0;color:var(--mut);font-size:14px;line-height:1.55;flex:1}
.tu-meta{display:flex;justify-content:space-between;align-items:center;font-size:13px;color:var(--mut);margin-top:6px}.tu-go{color:var(--blue);font-weight:700}
.tu-layout{display:grid;grid-template-columns:270px minmax(0,1fr);gap:24px;align-items:start}
.tu-side{padding:8px 0;overflow:hidden}.tu-side.sticky{position:sticky;top:calc(var(--hdr-h,70px) + 12px);max-height:calc(100vh - 100px);overflow:auto}
.tu-side h4{margin:0;padding:12px 16px;color:var(--navy);border-bottom:2px solid #e11d48;font-size:15px}
.tu-side a{display:flex;gap:10px;align-items:baseline;padding:11px 16px;font-weight:600;font-size:14.5px;color:var(--blue);border-bottom:1px solid #f0f3fa}.tu-side a:nth-of-type(even){background:#f8faff}
.tu-side a:hover,.tu-side a.on{background:#eaf2ff;color:var(--navy)}.tu-side a.on{box-shadow:inset 3px 0 0 var(--blue)}
.tu-side .ln{flex:0 0 22px;font-style:normal;font-size:12px;color:var(--mut)}.tu-side .tu-all{color:#e11d48;background:#fff!important}
.tu-bc{font-size:13.5px;color:var(--mut);margin-bottom:8px}.tu-bc a{color:var(--blue);font-weight:600}
.tu-h1{margin:0 0 14px;color:var(--navy);font-size:clamp(24px,3.6vw,34px);line-height:1.2}
.tu-chaps{margin-top:18px;background:#fff;border:1px solid #e6edf8;border-radius:16px;overflow:hidden}
.tu-chap{display:flex;gap:14px;align-items:center;padding:14px 18px;border-bottom:1px solid #eef2f9;transition:background .12s}.tu-chap:last-child{border:0}.tu-chap:hover{background:#f4f8ff}
.tu-chap i{flex:0 0 34px;height:34px;border-radius:50%;background:#eaf2ff;color:var(--blue);font-style:normal;font-weight:800;display:flex;align-items:center;justify-content:center;font-size:14px}
.tu-chap span{flex:1;min-width:0}.tu-chap b{display:block;color:#12203f;font-size:16px}.tu-chap em{display:block;font-style:normal;color:var(--mut);font-size:13.5px;margin-top:2px}.tu-chap u{text-decoration:none;font-size:12.5px;font-weight:700;color:#e11d48;background:#ffe9ee;padding:4px 10px;border-radius:20px;white-space:nowrap}
.tu-yt{margin:8px 0 12px;font-size:13.5px}.tu-yt a{color:var(--mut)}.tu-desc{font-size:16px;line-height:1.7;color:#25324f;margin:0 0 14px}
.tu-notes{margin:0 0 18px}.tu-code-h{margin:22px 0 10px;color:var(--navy);font-size:21px}
.tcode{margin:0 0 16px;border-radius:14px;overflow:hidden;background:#0f172a;border:1px solid #1e293b}
.tcode-h{display:flex;justify-content:space-between;align-items:center;padding:8px 14px;background:#1e293b;color:#cbd5e1;font:700 13px system-ui,sans-serif}
.tcode-copy{background:#334155;color:#fff;border:0;border-radius:8px;padding:5px 12px;font-weight:700;font-size:12.5px;cursor:pointer}.tcode-copy:hover{background:#2563eb}
.tcode pre{margin:0;padding:16px 18px;overflow:auto;max-height:520px;color:#e2e8f0;font:14px/1.65 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;tab-size:2}.tcode code{font:inherit;background:none;color:inherit;padding:0;white-space:pre}
.tu-nav{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;margin:24px 0 8px}
@media(max-width:860px){.tu-layout{grid-template-columns:1fr}.tu-side.sticky{position:static;max-height:260px}.tu-strip{padding:16px}}

/* ---------- Code box v2: light theme with colours (like a code editor) ---------- */
.tcode{background:#fff;border:1px solid #dbe3ef;box-shadow:0 4px 14px rgba(11,31,75,.06)}
.tcode-h{background:#f1f5fb;color:#334155;border-bottom:1px solid #dbe3ef}
.tcode-copy{background:#e2e8f0;color:#1e293b}.tcode-copy:hover{background:var(--blue);color:#fff}
.tcode pre{padding:0 18px;color:#1f2937;font-size:14px;line-height:24px;background-color:#fff;background-image:linear-gradient(transparent 50%,#f3f6fb 50%);background-size:100% 48px;background-attachment:local}
.tcode code{display:block;min-width:max-content;font:inherit;line-height:inherit}
.tk-c{color:#6b7280}.tk-t{color:#a31515}.tk-a{color:#198038}.tk-s{color:#0550ae}.tk-k{color:#cf222e}.tk-n{color:#b45309}.tk-v{color:#8250df}

/* ---------- Mobile fix: long code lines must scroll inside the code box, never widen the page ---------- */
.tu-layout>*{min-width:0}
.tu-layout>article,.tu-layout>section{min-width:0;max-width:100%}
.tcode{max-width:100%;min-width:0}
.tcode pre{max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch}
.tu-notes,.tu-desc{overflow-wrap:anywhere}
@media(max-width:860px){.tu-layout{grid-template-columns:minmax(0,1fr)}.tcode pre{font-size:13px}.tu-nav .btn,.tu-nav .btn-o{width:100%;text-align:center}}

/* Code boxes: phones and small tablets show the whole code (page scrolls); computers keep a fixed-height box with its own scrollbar */
@media(max-width:860px){.tcode pre{max-height:none}}