/* ===== HỌC VUI VIẾT HAY – bộ giao diện chung cho mọi trang =====
   Màu thương hiệu: mực xanh đêm (chữ, nền đậm) · đỏ bút phê (điểm nhấn) · giấy kem (nền) · vàng phượng (thưởng) */
:root{
  --ink:#16233f;--ink-2:#2b3a5c;--muted:#5d6b88;--line:#e6e0d2;
  --paper:#fbf8f1;--card:#ffffff;--soft:#f3eee2;
  --red:#d6342c;--red-2:#b5241d;--red-soft:#fde9e6;
  --gold:#f2b632;--gold-soft:#fff4d6;--teal:#1c9c8a;--teal-soft:#dff5f1;--purple:#7b3fb0;--purple-soft:#f1e8fa;--blue:#2f6fd6;--blue-soft:#e4eefc;
  --r:18px;--r-lg:26px;--shadow:0 1px 2px rgba(22,35,63,.06),0 8px 24px rgba(22,35,63,.08);--shadow-lg:0 20px 50px rgba(22,35,63,.16);
  --serif:"Lora",Georgia,"Times New Roman",serif;--sans:"Be Vietnam Pro","Segoe UI",system-ui,Arial,sans-serif;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 var(--sans);-webkit-font-smoothing:antialiased}
img,svg{max-width:100%;display:block}a{color:inherit;text-decoration:none}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}
@media(max-width:600px){.wrap{padding:0 16px}}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* ---- nút ---- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:999px;padding:12px 22px;font:700 15px/1.2 var(--sans);cursor:pointer;transition:transform .15s,box-shadow .15s,background .15s;white-space:nowrap}
.btn:active{transform:translateY(1px)}
.btn-red{background:var(--red);color:#fff;box-shadow:0 6px 16px rgba(214,52,44,.28)}.btn-red:hover{background:var(--red-2)}
.btn-ink{background:var(--ink);color:#fff}.btn-ink:hover{background:var(--ink-2)}
.btn-line{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 2px var(--line)}.btn-line:hover{box-shadow:inset 0 0 0 2px var(--ink)}
.btn-sm{padding:8px 14px;font-size:14px}

/* ---- đầu trang ---- */
.top{position:sticky;top:0;z-index:30;background:rgba(251,248,241,.9);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:22px;height:68px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:-.2px}
.brand svg{width:40px;height:40px;flex:none}
.brand b{display:block;font-size:18px;line-height:1.1}.brand small{display:block;font-size:11.5px;font-weight:600;color:var(--muted);letter-spacing:.2px}
.nav{display:flex;gap:4px;margin-left:auto}
.nav a{padding:8px 14px;border-radius:999px;font-weight:600;font-size:15px;color:var(--ink-2)}
.nav a:hover,.nav a.on{background:var(--soft);color:var(--ink)}
.me{display:flex;align-items:center;gap:8px;padding:6px 6px 6px 12px;border-radius:999px;background:var(--card);box-shadow:var(--shadow);font-weight:700;font-size:14px}
.me .fire{color:var(--red)}.me .av{width:30px;height:30px;border-radius:50%;background:var(--ink);color:#fff;display:grid;place-items:center;font-size:13px}
.burger{display:none;margin-left:auto;background:none;border:0;font-size:26px;cursor:pointer;color:var(--ink)}
@media(max-width:900px){.nav{display:none;position:absolute;top:68px;left:0;right:0;flex-direction:column;background:var(--paper);padding:10px 16px 16px;border-bottom:1px solid var(--line);box-shadow:var(--shadow)}.nav.open{display:flex}.burger{display:block}.top .me{margin-left:0}}
.me .fire,.brand b{white-space:nowrap}
.brand{min-width:0}.brand span{min-width:0;overflow:hidden}.brand b{overflow:hidden;text-overflow:ellipsis}.me{flex:none}
@media(max-width:420px){.btn{white-space:normal;text-align:center}}
@media(max-width:600px){.top .wrap{gap:10px;height:60px}.nav{top:60px}.brand svg{width:34px;height:34px}.brand b{font-size:16px}.brand small{display:none}.me{padding:4px 4px 4px 10px;gap:6px}.me .me-l{display:none}.me .av{width:26px;height:26px}.burger{margin-left:0}}

/* ---- hero ---- */
.hero{padding:56px 0 40px;position:relative;overflow:hidden}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
@media(max-width:900px){.hero{padding:32px 0 24px}.hero .wrap{grid-template-columns:1fr;gap:30px}}
.eyebrow{display:inline-flex;align-items:center;gap:8px;background:var(--gold-soft);color:#7a5600;font-weight:700;font-size:13px;padding:6px 12px;border-radius:999px}
.hero h1{font:700 clamp(34px,5.2vw,58px)/1.08 var(--serif);letter-spacing:-1px;margin:18px 0 16px}
.hero h1 em{font-style:normal;color:var(--red);position:relative;white-space:nowrap}
.hero h1 em::after{content:"";position:absolute;left:-2px;right:-2px;bottom:.02em;height:.16em;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 12' preserveAspectRatio='none'%3E%3Cpath d='M2 9 Q 60 1 120 6 T 198 4' fill='none' stroke='%23d6342c' stroke-width='3' stroke-linecap='round'/%3E%3C/svg%3E") no-repeat center/100% 100%;opacity:.7}
.hero p.lead{font-size:clamp(16px,1.6vw,19px);color:var(--ink-2);max-width:540px;margin:0 0 26px}
.cta{display:flex;gap:12px;flex-wrap:wrap}
.trust{display:flex;gap:22px;flex-wrap:wrap;margin-top:28px;color:var(--muted);font-size:14px;font-weight:600}
.trust span{display:flex;align-items:center;gap:6px}.trust i{font-style:normal;color:var(--teal);font-size:16px}

/* trang vở minh hoạ ở hero */
.sheet{position:relative;background:var(--card);border-radius:var(--r-lg);box-shadow:var(--shadow-lg);padding:64px 30px 40px 54px;transform:rotate(1.2deg);
  background-image:linear-gradient(#fff 0 0),repeating-linear-gradient(transparent 0 33px,#e9eef8 33px 34px);background-blend-mode:normal}
.sheet::before{content:"";position:absolute;left:38px;top:0;bottom:0;width:2px;background:#f3b3ae}
.sheet .lines{background:repeating-linear-gradient(transparent 0 33px,#e9eef8 33px 34px);font:18px/34px var(--serif);color:var(--ink);margin:0}
.sheet .ld{font-weight:700;text-decoration:underline;text-underline-offset:4px}.sheet .dc{color:#d0021b}.sheet .bi{color:var(--purple);font-style:italic}
.sheet .mark{position:absolute;right:-14px;top:-22px;width:96px;height:96px;border-radius:50%;border:3px solid var(--red);color:var(--red);display:grid;place-items:center;transform:rotate(-12deg);background:#fff;font:700 34px/1 var(--serif);box-shadow:var(--shadow)}
.sheet .mark small{display:block;font:700 10px/1 var(--sans);letter-spacing:1px;text-align:center;margin-top:2px}
.sheet .note{margin-top:14px;border-top:1px dashed var(--line);padding-top:12px;font:italic 17px/1.5 "Patrick Hand","Segoe Print",cursive;color:var(--red)}
.sheet .tagx{position:absolute;left:-16px;bottom:-18px;background:var(--ink);color:#fff;font-weight:700;font-size:13px;border-radius:12px;padding:8px 12px;transform:rotate(-3deg);box-shadow:var(--shadow)}
@media(max-width:600px){.sheet{padding:56px 18px 34px 40px;transform:none}.sheet::before{left:28px}.sheet .lines{font-size:16px;line-height:30px;background:repeating-linear-gradient(transparent 0 29px,#e9eef8 29px 30px)}.sheet .mark{right:-6px;width:78px;height:78px;font-size:28px}.sheet .tagx{left:8px}}

/* ---- khối chung ---- */
section{padding:44px 0;scroll-margin-top:60px}
.sec-h{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:22px;flex-wrap:wrap}
.sec-h h2{font:700 clamp(26px,3.2vw,36px)/1.15 var(--serif);margin:0;letter-spacing:-.4px}
.sec-h p{margin:6px 0 0;color:var(--muted)}
.kicker{font-weight:800;font-size:12.5px;letter-spacing:1.4px;text-transform:uppercase;color:var(--red)}

/* nhiệm vụ hôm nay */
.today{display:grid;grid-template-columns:1.4fr 1fr;gap:18px}
@media(max-width:900px){.today{grid-template-columns:1fr}}
.mission{background:var(--ink);color:#fff;border-radius:var(--r-lg);padding:26px;position:relative;overflow:hidden}
.mission::after{content:"";position:absolute;right:-60px;top:-60px;width:220px;height:220px;border-radius:50%;background:radial-gradient(circle,rgba(242,182,50,.35),transparent 70%)}
.mission .kicker{color:var(--gold)}
.mission h3{font:700 26px/1.25 var(--serif);margin:8px 0 8px}
.mission p{color:#c9d3ea;margin:0 0 18px;max-width:520px}
.mission .meta{display:flex;gap:16px;flex-wrap:wrap;color:#c9d3ea;font-size:14px;margin-bottom:20px}
.streak{background:var(--card);border-radius:var(--r-lg);padding:22px 24px;box-shadow:var(--shadow)}
.streak .big{display:flex;align-items:center;gap:12px}
.streak .big b{font:700 44px/1 var(--serif);color:var(--red)}
.streak .big span{color:var(--muted);font-weight:600;line-height:1.3}
.week{display:grid;grid-template-columns:repeat(7,1fr);gap:6px;margin:18px 0 6px}
.week div{text-align:center;font-size:12px;color:var(--muted);font-weight:700}
.week i{display:grid;place-items:center;height:36px;border-radius:12px;background:var(--soft);font-style:normal;font-size:17px;margin-top:4px}
.week .done i{background:var(--red-soft)}.week .now i{box-shadow:inset 0 0 0 2px var(--red)}
.stats{display:flex;gap:10px;margin-top:14px}.stats div{flex:1;background:var(--soft);border-radius:14px;padding:10px 12px}.stats b{display:block;font-size:20px}.stats span{font-size:12.5px;color:var(--muted);font-weight:600}

/* ba trụ cột */
.pillars{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
@media(max-width:900px){.pillars{grid-template-columns:1fr}}
.pillar{background:var(--card);border-radius:var(--r-lg);padding:26px;box-shadow:var(--shadow);display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s}
.pillar:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.pillar .ic{width:56px;height:56px;border-radius:16px;display:grid;place-items:center;font-size:28px;margin-bottom:16px}
.pillar h3{font:700 22px/1.25 var(--serif);margin:0 0 8px}
.pillar p{color:var(--muted);margin:0 0 16px;flex:1}
.pillar ul{list-style:none;padding:0;margin:0 0 18px;display:grid;gap:8px;font-size:14.5px;font-weight:600}
.pillar li::before{content:"✓";color:var(--teal);font-weight:900;margin-right:8px}
.pillar .go{font-weight:800;color:var(--red);display:inline-flex;gap:6px;align-items:center}
.pillar.p1 .ic{background:var(--red-soft)}.pillar.p2 .ic{background:var(--blue-soft)}.pillar.p3 .ic{background:var(--gold-soft)}

/* kho bài học */
.filters{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:20px}
.chip{border:0;background:var(--card);box-shadow:inset 0 0 0 1.5px var(--line);color:var(--ink-2);border-radius:999px;padding:8px 14px;font:600 14px/1 var(--sans);cursor:pointer}
.chip:hover{box-shadow:inset 0 0 0 1.5px var(--ink-2)}.chip.on{background:var(--ink);color:#fff;box-shadow:none}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px}
.item{background:var(--card);border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s}
.item:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.cover{height:148px;position:relative;display:grid;place-items:center;font-size:58px;overflow:hidden}
.cover::after{content:"";position:absolute;inset:0;background:radial-gradient(circle at 80% 10%,rgba(255,255,255,.35),transparent 50%)}
.cover .ty{position:absolute;left:12px;top:12px;background:rgba(255,255,255,.92);color:var(--ink);font-size:12px;font-weight:800;border-radius:999px;padding:4px 10px}
.cover .pro{position:absolute;right:12px;top:12px;background:var(--ink);color:var(--gold);font-size:12px;font-weight:800;border-radius:999px;padding:4px 10px}
.cover .free{position:absolute;right:12px;top:12px;background:var(--teal);color:#fff;font-size:12px;font-weight:800;border-radius:999px;padding:4px 10px}
.item .body{padding:16px 18px 18px;display:flex;flex-direction:column;flex:1}
.item .sub{font-size:12.5px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.6px}
.item h3{font:700 19px/1.3 var(--serif);margin:6px 0 6px}
.item p{font-size:14.5px;color:var(--muted);margin:0 0 14px;flex:1}
.item .row{display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:13.5px;color:var(--muted);font-weight:600}
.item.soon{opacity:.72}.item.soon:hover{transform:none}
.badge-soon{background:var(--soft);color:var(--muted);border-radius:999px;padding:6px 12px;font-weight:700;font-size:13px;white-space:nowrap}

/* video */
.vids{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
@media(max-width:900px){.vids{grid-template-columns:1fr}}
.vid{background:var(--card);border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--shadow)}
.vid .th{aspect-ratio:16/9;background:linear-gradient(135deg,#1f3768,#16233f);display:grid;place-items:center;position:relative;color:#fff}
.vid .th .pl{width:62px;height:62px;border-radius:50%;background:rgba(255,255,255,.95);color:var(--red);display:grid;place-items:center;font-size:24px;padding-left:4px;box-shadow:0 8px 20px rgba(0,0,0,.3)}
.vid .th small{position:absolute;bottom:10px;right:12px;background:rgba(0,0,0,.55);border-radius:6px;padding:2px 8px;font-size:12px;font-weight:700}
.vid .body{padding:14px 16px 16px}.vid h3{font:700 17px/1.35 var(--serif);margin:0 0 4px}.vid p{margin:0;color:var(--muted);font-size:14px}

/* giới thiệu cô */
.about{display:grid;grid-template-columns:auto 1fr;gap:28px;align-items:center;background:var(--card);border-radius:var(--r-lg);padding:30px;box-shadow:var(--shadow)}
@media(max-width:700px){.about{grid-template-columns:1fr;text-align:center}.about .ph{margin:0 auto}}
.about .ph{width:132px;height:132px;border-radius:50%;background:linear-gradient(135deg,var(--red),var(--gold));display:grid;place-items:center;color:#fff;font:700 50px/1 var(--serif);box-shadow:0 0 0 6px var(--paper),0 0 0 8px var(--red-soft)}
.about h3{font:700 26px/1.2 var(--serif);margin:0 0 6px}.about p{margin:0 0 14px;color:var(--ink-2)}
.quote{font:italic 19px/1.5 var(--serif);color:var(--ink);border-left:4px solid var(--red);padding-left:14px;margin:0 0 16px;text-align:left}

/* chân trang */
footer{background:var(--ink);color:#c9d3ea;margin-top:40px;padding:44px 0 26px;font-size:14.5px}
footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr 1fr;gap:28px}
@media(max-width:800px){footer .cols{grid-template-columns:1fr 1fr}}
footer h4{color:#fff;margin:0 0 12px;font-size:15px}
footer a{display:block;padding:3px 0;color:#c9d3ea}footer a:hover{color:#fff}
footer .brand{color:#fff;margin-bottom:12px}footer .brand small{color:#9fb0d3}
footer .legal{border-top:1px solid rgba(255,255,255,.12);margin-top:30px;padding-top:18px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:13px;color:#9fb0d3}

/* trang nội dung (chính sách, giới thiệu) */
.doc{max-width:760px;margin:0 auto;padding:40px 20px}
.doc h1{font:700 clamp(28px,4vw,40px)/1.2 var(--serif);margin:0 0 8px}
.doc h2{font:700 22px/1.3 var(--serif);margin:28px 0 8px}
.doc p,.doc li{color:var(--ink-2)}.doc .upd{color:var(--muted);font-size:14px}

/* khung chứa trò chơi */
.player-bar{display:flex;align-items:center;gap:12px;padding:10px 0}
.player-bar a{font-weight:700;color:var(--ink-2)}
.player-frame{width:100%;border:0;border-radius:var(--r-lg);box-shadow:var(--shadow-lg);background:#0e2340;min-height:80vh}

/* số liệu cộng đồng */
.hv-stat{font-size:14px;color:var(--muted);font-weight:600}.hv-stat b{color:var(--ink)}
.item .hv-pl{display:block;font-size:13px;color:var(--muted);font-weight:600;margin:-6px 0 12px}.item .hv-pl b{color:var(--red)}
/* khối cộng đồng dưới mỗi trò: câu văn, đoạn văn hay */
.hv-cd{background:var(--card);border-radius:var(--r-lg);box-shadow:var(--shadow);padding:18px;margin-top:22px}
.hv-title{font:700 20px/1.3 var(--serif);margin:0 0 6px}
.hv-note,.hv-empty{color:var(--muted);font-size:14.5px;margin:0 0 12px}
.hv-list{display:grid;gap:12px}
.hv-item{border:1.5px solid var(--line);border-radius:16px;padding:14px 16px;position:relative}
.hv-head{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:6px}
.hv-diem{background:var(--red-soft);color:var(--red-2);border-radius:999px;padding:2px 10px;font-weight:800;font-size:13px}
.hv-text{font:500 17px/1.65 var(--serif);color:var(--ink)}
.hv-text .dc{color:#d0021b}.hv-text .binh{color:var(--purple);font-style:italic}.hv-text .ld{font-weight:700;text-decoration:underline}
.hv-rep{border:0;background:none;color:var(--muted);font-size:12.5px;cursor:pointer;padding:4px 0 0}.hv-rep:hover{color:var(--red)}

/* lời nhắc nghỉ mắt */
.rest{position:fixed;left:50%;bottom:20px;transform:translateX(-50%);z-index:70;background:var(--ink);color:#fff;border-radius:18px;padding:14px 16px;box-shadow:var(--shadow-lg);display:flex;align-items:center;gap:12px;max-width:min(520px,calc(100vw - 32px));animation:up .4s ease}
.rest p{margin:0;font-size:15px;line-height:1.45}.rest button{flex:none;border:0;border-radius:999px;background:var(--gold);color:#2a1a00;font:800 14px var(--sans);padding:8px 14px;cursor:pointer}
@keyframes up{from{transform:translate(-50%,30px);opacity:0}}
/* câu văn hay mỗi ngày */
.daily{background:var(--card);border-radius:var(--r-lg);box-shadow:var(--shadow);padding:26px 28px;display:grid;grid-template-columns:auto 1fr;gap:20px;align-items:center}
@media(max-width:600px){.daily{grid-template-columns:1fr;padding:22px}}
.daily .q{font:700 64px/1 var(--serif);color:var(--red);opacity:.85}
.daily blockquote{margin:0;font:500 italic clamp(19px,2.2vw,24px)/1.55 var(--serif)}
.daily cite{display:block;font-style:normal;font-weight:700;color:var(--muted);margin-top:8px}
.daily .en{margin-top:12px;padding-top:12px;border-top:1px dashed var(--line);color:var(--ink-2);font-size:15px}
.daily .en b{background:var(--blue-soft);color:var(--blue);border-radius:6px;padding:1px 6px;font-size:12px;margin-right:6px}
.daily .en button{border:0;background:none;cursor:pointer;font-size:16px}
/* trợ năng: viền khi dùng bàn phím, giảm chuyển động */
:focus-visible{outline:3px solid var(--gold);outline-offset:2px}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* hộp nhập tên lần đầu */
.modal{position:fixed;inset:0;background:rgba(22,35,63,.55);display:none;align-items:center;justify-content:center;z-index:50;padding:16px}
.modal.on{display:flex}
.modal .box{background:var(--card);border-radius:var(--r-lg);padding:28px;max-width:420px;width:100%;box-shadow:var(--shadow-lg);text-align:center}
.modal h3{font:700 24px/1.25 var(--serif);margin:6px 0 6px}.modal p{color:var(--muted);margin:0 0 16px}
.modal input{width:100%;border:2px solid var(--line);border-radius:14px;padding:12px 14px;font:600 17px var(--sans);color:var(--ink);margin-bottom:14px;outline:none}
.modal input:focus{border-color:var(--ink)}
.modal small{display:block;color:var(--muted);margin-top:12px;font-size:12.5px}