/* Landing Page Guide — hệ thống thiết kế: bạc hà · kem · xanh đậm. Mobile-first, sáng/tối, tiết kiệm pin. */
:root{
  --bg:#fbf8f1;--bg2:#f4f1e8;--surface:#ffffff;--surface2:#f5f9f6;--ink:#10263b;--ink2:#2b4256;--sub:#5a6b78;--line:#e4e9e3;--line2:#d5ddd6;
  --navy:#0e3a5b;--navy2:#174d74;--mint:#8fd3be;--mint-strong:#2a9d80;--mint-bg:#e3f4ed;--mint-ink:#11604f;--peach:#f2b38f;--peach-bg:#fdeee4;--peach-ink:#93441d;
  --lilac-bg:#ece8f8;--lilac-ink:#4f3f86;--sky-bg:#e4f0fa;--sky-ink:#1d5a87;--sand-bg:#f6efdc;--sand-ink:#7a5a12;--rose-bg:#fbe8ea;--rose-ink:#8d2a3a;
  --danger:#b4443f;--danger-bg:#fbe9e7;--warn:#a1650c;--warn-bg:#fdf3df;--ok:#1d7a55;--ok-bg:#e3f4ec;--info:#1d5a87;--info-bg:#e6f0f9;
  --primary:var(--navy);--on-primary:#ffffff;--focus:#e0943d;
  --radius:16px;--radius-sm:11px;--radius-lg:22px;--shadow:0 1px 2px rgba(16,38,59,.04),0 8px 24px -12px rgba(16,38,59,.12);--shadow-lg:0 24px 60px -28px rgba(16,38,59,.35);
  --font:"Segoe UI Variable Text","Segoe UI",system-ui,-apple-system,BlinkMacSystemFont,"Helvetica Neue",Roboto,Arial,sans-serif;
  --display:"Palatino Linotype","Book Antiqua",Cambria,"Noto Serif","Times New Roman",serif;
  --mono:ui-monospace,"Cascadia Code",Consolas,"SF Mono",Menlo,monospace;
  --text-scale:1;--side-w:264px;--top-h:64px;
  --ring-track:#e6ece7;
  --logo-a:#0f3d5e;--logo-b:#1b6a7e;--logo-bar:#cfeee3;--logo-line:#8fe0c4;--logo-dot1:#f2b38f;--logo-dot2:#f8e3a3;--logo-dot3:#8fd3be;--logo-cursor:#ffffff;--logo-cursor-stroke:#0e3a5b;
  /* minh họa */
  --f-bg:#f1f6f2;--f-card:#ffffff;--f-line:#dfe7e3;--f-ink:#12263a;--f-navy:#143a5c;--f-mint:#8fd3be;--f-mint2:#d8f1e8;--f-peach:#f6c7a8;--f-lilac:#d9d2f3;--f-sun:#f8e3a3;--f-rose:#f4c4c9;--f-sky:#cfe6f7;--f-sub:#5b6b78;--f-inv:#ffffff;
  color-scheme:light;
}
:root[data-theme="dark"]{
  --bg:#0d1824;--bg2:#101e2c;--surface:#13212e;--surface2:#172938;--ink:#e6eff3;--ink2:#c7d6de;--sub:#9aafbd;--line:#223646;--line2:#2c4457;
  --navy:#9cc9ea;--navy2:#b8dbf3;--mint:#5fc3a6;--mint-strong:#5fc3a6;--mint-bg:#16352f;--mint-ink:#8fe0c4;--peach:#e9a37c;--peach-bg:#3a261b;--peach-ink:#f6c7a8;
  --lilac-bg:#2a2542;--lilac-ink:#cdc3f2;--sky-bg:#16304a;--sky-ink:#a9d1f2;--sand-bg:#33291a;--sand-ink:#f0d7a0;--rose-bg:#3a2026;--rose-ink:#f4c4c9;
  --danger:#f08c84;--danger-bg:#3b1d1c;--warn:#f0c06a;--warn-bg:#3a2d14;--ok:#7fd6ad;--ok-bg:#163527;--info:#a9d1f2;--info-bg:#16304a;
  --primary:#8fd3be;--on-primary:#0b1d2a;--focus:#f2b38f;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 10px 30px -16px rgba(0,0,0,.6);--shadow-lg:0 30px 70px -30px rgba(0,0,0,.8);
  --ring-track:#223646;
  --logo-a:#1a4d6e;--logo-b:#1f7a72;--logo-bar:#cfeee3;--logo-line:#9ff0d3;--logo-cursor:#f6fbff;--logo-cursor-stroke:#0b1d2a;
  --f-bg:#13232f;--f-card:#1a2c3a;--f-line:#2a3d4e;--f-ink:#e7f0f4;--f-navy:#9cc3e6;--f-mint:#5fc3a6;--f-mint2:#1f3a36;--f-peach:#c98a66;--f-lilac:#5d5390;--f-sun:#b89a4a;--f-rose:#a3606b;--f-sky:#2d5576;--f-sub:#9aafbd;--f-inv:#0b1d2a;
  color-scheme:dark;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;font-size:calc(16px * var(--text-scale))}
body{margin:0;background:var(--bg);color:var(--ink);font:1rem/1.6 var(--font);overflow-x:hidden;-webkit-font-smoothing:antialiased}
body.no-scroll{overflow:hidden}
img,svg{max-width:100%}
a{color:var(--navy2)}
:root[data-theme="dark"] a{color:var(--mint-ink)}
h1,h2,h3,h4{line-height:1.2;margin:0 0 .5em;letter-spacing:-.01em;color:var(--ink)}
h1,.display{font-family:var(--display);font-weight:700;font-size:clamp(1.9rem,3.6vw,2.9rem);letter-spacing:-.015em}
h2{font-size:clamp(1.35rem,2.2vw,1.7rem);font-weight:700}
h3{font-size:1.12rem;font-weight:700}
h4{font-size:1rem}
p{margin:0 0 1em}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-radius:6px}
.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip{position:absolute;left:-999px;top:8px;z-index:200;background:var(--navy);color:#fff;padding:10px 14px;border-radius:10px}
.skip:focus{left:10px}
.ic{flex:none;vertical-align:middle}

/* ---------- Khung ứng dụng ---------- */
.shell{display:grid;grid-template-columns:var(--side-w) minmax(0,1fr);min-height:100vh;min-height:100dvh}
.side{position:sticky;top:0;height:100vh;height:100dvh;display:flex;flex-direction:column;gap:14px;padding:18px 14px 14px;border-right:1px solid var(--line);background:var(--bg2);overflow-y:auto;z-index:40;scrollbar-width:thin}
.brand-row{display:flex;align-items:center;gap:11px;padding:4px 8px 10px;text-decoration:none;color:var(--ink)}
.brand-row b{display:block;font-family:var(--display);font-size:1.14rem;line-height:1.1;letter-spacing:-.01em}
.brand-row small{display:block;color:var(--sub);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;margin-top:3px}
.nav{display:grid;gap:2px}
.nav a{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:12px;color:var(--ink2);text-decoration:none;font-weight:600;font-size:.94rem;position:relative}
.nav a .ic{color:var(--sub)}
.nav a:hover{background:var(--surface)}
.nav a[aria-current="page"]{background:var(--surface);color:var(--ink);box-shadow:var(--shadow)}
.nav a[aria-current="page"] .ic{color:var(--mint-strong)}
.nav a[aria-current="page"]::before{content:"";position:absolute;left:-14px;top:9px;bottom:9px;width:4px;border-radius:0 4px 4px 0;background:var(--mint-strong)}
.nav .num{margin-left:auto;font-size:.72rem;color:var(--sub);font-weight:600}
.side-card{margin-top:auto;padding:14px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--line)}
.side-card .row{display:flex;justify-content:space-between;align-items:center;font-size:.86rem}
.side-foot{font-size:.74rem;color:var(--sub);padding:0 8px}
.side-foot a{color:var(--sub)}
.main-col{min-width:0;display:flex;flex-direction:column}
.topbar{position:sticky;top:0;z-index:30;display:flex;align-items:center;gap:10px;min-height:var(--top-h);padding:10px clamp(14px,3vw,36px);background:color-mix(in srgb,var(--bg) 94%,transparent);border-bottom:1px solid var(--line)}
@supports not (background:color-mix(in srgb,red,blue)){.topbar{background:var(--bg)}}
.topbar .crumb{flex:1;min-width:0;font-size:.9rem;color:var(--sub);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topbar .crumb b{color:var(--ink);font-weight:700}
.topbar .mlogo{display:none}
.icon-btn{display:inline-grid;place-items:center;width:42px;height:42px;border-radius:12px;border:1px solid var(--line);background:var(--surface);color:var(--ink2);flex:none}
.icon-btn:hover{border-color:var(--line2);color:var(--ink)}
.icon-btn[aria-pressed="true"]{background:var(--mint-bg);color:var(--mint-ink);border-color:transparent}
.pill-status{display:inline-flex;align-items:center;gap:6px;padding:6px 10px;border-radius:999px;font-size:.76rem;font-weight:700;background:var(--mint-bg);color:var(--mint-ink);white-space:nowrap}
.pill-status.saving{background:var(--warn-bg);color:var(--warn)}
#view{flex:1;width:100%;max-width:1400px;margin:0 auto;padding:clamp(16px,3vw,36px) clamp(14px,3vw,36px) 48px;outline:none}
.app-foot{padding:18px clamp(14px,3vw,36px) calc(18px + env(safe-area-inset-bottom));border-top:1px solid var(--line);font-size:.8rem;color:var(--sub);display:flex;flex-wrap:wrap;gap:6px 18px;justify-content:space-between}
.app-foot a{color:var(--sub)}
.bottom-nav{display:none}
.scrim{display:none}

/* ---------- Thành phần ---------- */
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:clamp(16px,2.2vw,24px);box-shadow:var(--shadow);min-width:0}
.card.flat{box-shadow:none}
.card.tint{background:var(--surface2)}
.card h2:first-child,.card h3:first-child{margin-top:0}
.grid{display:grid;gap:16px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}
.g3{grid-template-columns:repeat(3,minmax(0,1fr))}
.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
.auto{grid-template-columns:repeat(auto-fill,minmax(min(100%,260px),1fr))}
.stack{display:flex;flex-direction:column;gap:14px}
.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.between{justify-content:space-between}
.mt0{margin-top:0}.mt1{margin-top:8px}.mt2{margin-top:16px}.mt3{margin-top:24px}.mt4{margin-top:36px}.mb0{margin-bottom:0}.mb2{margin-bottom:16px}
.muted{color:var(--sub)}
.small{font-size:.86rem}
.tiny{font-size:.76rem}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:.74rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--mint-ink)}
.lead{font-size:1.08rem;color:var(--sub);max-width:760px}
.page-head{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;flex-wrap:wrap;margin-bottom:22px}
.page-head h1{margin:.2em 0 .25em}
.page-head .lead{margin:0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:42px;padding:9px 16px;border-radius:12px;border:1px solid var(--line2);background:var(--surface);color:var(--ink);font-weight:650;font-size:.93rem;text-decoration:none;line-height:1.2;transition:transform .15s ease,background .15s ease,border-color .15s ease;white-space:nowrap}
.btn:hover{border-color:var(--sub)}
.btn:active{transform:translateY(1px)}
.btn.primary{background:var(--primary);border-color:var(--primary);color:var(--on-primary)}
.btn.primary:hover{filter:brightness(1.08)}
.btn.mint{background:var(--mint-bg);border-color:transparent;color:var(--mint-ink)}
.btn.ghost{background:transparent;border-color:transparent;color:var(--ink2)}
.btn.ghost:hover{background:var(--surface2)}
.btn.danger{background:var(--danger-bg);border-color:transparent;color:var(--danger)}
.btn.sm{min-height:34px;padding:6px 11px;font-size:.84rem;border-radius:10px}
.btn.lg{min-height:50px;padding:12px 22px;font-size:1rem}
.btn.block{width:100%}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed}
.chip{display:inline-flex;align-items:center;gap:6px;padding:5px 10px;border-radius:999px;background:var(--surface2);border:1px solid var(--line);font-size:.78rem;font-weight:650;color:var(--ink2);max-width:100%;line-height:1.35;overflow-wrap:anywhere}
.chip.mint{background:var(--mint-bg);color:var(--mint-ink);border-color:transparent}
.chip.peach{background:var(--peach-bg);color:var(--peach-ink);border-color:transparent}
.chip.warn{background:var(--warn-bg);color:var(--warn);border-color:transparent}
.chip.danger{background:var(--danger-bg);color:var(--danger);border-color:transparent}
.chip.info{background:var(--info-bg);color:var(--info);border-color:transparent}
.chip.ok{background:var(--ok-bg);color:var(--ok);border-color:transparent}
button.chip{cursor:pointer}
button.chip[aria-pressed="true"]{background:var(--primary);color:var(--on-primary);border-color:var(--primary)}
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:16px}
.tab{padding:8px 14px;border-radius:999px;border:1px solid var(--line);background:var(--surface);font-weight:650;font-size:.88rem;color:var(--ink2)}
.tab[aria-selected="true"]{background:var(--primary);border-color:var(--primary);color:var(--on-primary)}
.bar{height:8px;border-radius:99px;background:var(--ring-track);overflow:hidden}
.bar span{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,var(--mint-strong),var(--mint));transition:width .4s ease}
.ring{display:block}
.ring-val{transition:stroke-dashoffset .6s ease}
.ring-wrap{position:relative;display:inline-grid;place-items:center}
.ring-wrap .ring-num{position:absolute;text-align:center;line-height:1.1}
.ring-wrap .ring-num b{display:block;font-size:1.7rem;font-family:var(--display)}
.notice{display:flex;gap:12px;align-items:flex-start;padding:12px 14px;border-radius:var(--radius-sm);background:var(--info-bg);color:var(--ink);font-size:.9rem}
.notice .ic{color:var(--info);margin-top:2px}
.notice.warn{background:var(--warn-bg)}.notice.warn .ic{color:var(--warn)}
.notice.ok{background:var(--ok-bg)}.notice.ok .ic{color:var(--ok)}
.notice.danger{background:var(--danger-bg)}.notice.danger .ic{color:var(--danger)}
.notice p:last-child{margin-bottom:0}
.kbd{font-family:var(--mono);font-size:.78rem;padding:2px 6px;border-radius:6px;border:1px solid var(--line2);background:var(--surface2)}
code,.code{font-family:var(--mono);font-size:.84rem}
pre.code{white-space:pre-wrap;word-break:break-word;background:#0f2233;color:#e3f1ec;padding:14px 16px;border-radius:12px;max-height:380px;overflow:auto;margin:0}
table.tbl{width:100%;border-collapse:collapse;font-size:.9rem}
.tbl-wrap{width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;border:1px solid var(--line);border-radius:var(--radius-sm)}
.tbl th,.tbl td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
.tbl th{background:var(--surface2);font-size:.8rem;letter-spacing:.02em;color:var(--ink2)}
.tbl tr:last-child td{border-bottom:0}
.tbl input{width:100%;min-width:80px;padding:6px 8px;border:1px solid var(--line2);border-radius:8px;background:var(--surface)}
.divider{border:0;border-top:1px solid var(--line);margin:20px 0}
.empty-state{text-align:center;padding:32px 16px;color:var(--sub)}
.empty-state .fig{max-width:280px;margin:0 auto 10px;display:block}
.empty-state h3{color:var(--ink)}

/* Biểu mẫu */
.field{display:flex;flex-direction:column;gap:6px;min-width:0}
.field>span,.field>label,.lbl{font-weight:650;font-size:.86rem;color:var(--ink2)}
.field small,.hint{font-size:.78rem;color:var(--sub)}
.input,.field input:not([type=checkbox]):not([type=radio]):not([type=color]):not([type=range]),.field select,.field textarea,select.input,textarea.input{width:100%;min-height:42px;padding:9px 12px;border:1px solid var(--line2);border-radius:var(--radius-sm);background:var(--surface);color:var(--ink);font-size:16px}
@media (min-width:900px){.input,.field input:not([type=checkbox]):not([type=radio]):not([type=color]):not([type=range]),.field select,.field textarea{font-size:.94rem}}
.field textarea,textarea.input{min-height:90px;resize:vertical;line-height:1.5}
.input:focus,.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--mint-strong);outline:2px solid color-mix(in srgb,var(--mint-strong) 30%,transparent);outline-offset:0}
.field.bad input,.field.bad textarea,.field.bad select{border-color:var(--danger)}
.field .err{color:var(--danger);font-size:.78rem}
.counter{font-size:.74rem;color:var(--sub);text-align:right}
.counter.warn{color:var(--warn)}
.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px 14px}
.form-grid .full{grid-column:1/-1}
.check{display:flex;gap:10px;align-items:flex-start;font-size:.9rem;cursor:pointer}
.check input{width:18px;height:18px;margin-top:2px;flex:none;accent-color:var(--mint-strong)}
.switch{position:relative;display:inline-flex;align-items:center;gap:10px;cursor:pointer;font-size:.9rem}
.switch input{position:absolute;opacity:0;width:1px;height:1px}
.switch .sw{width:40px;height:24px;border-radius:99px;background:var(--line2);position:relative;transition:background .2s;flex:none}
.switch .sw::after{content:"";position:absolute;top:3px;left:3px;width:18px;height:18px;border-radius:50%;background:#fff;transition:transform .2s;box-shadow:0 1px 3px #0003}
.switch input:checked+.sw{background:var(--mint-strong)}
.switch input:checked+.sw::after{transform:translateX(16px)}
.switch input:focus-visible+.sw{outline:3px solid var(--focus);outline-offset:2px}
.seg{display:inline-flex;padding:3px;border-radius:12px;background:var(--surface2);border:1px solid var(--line);gap:2px;flex-wrap:wrap}
.seg button{border:0;background:transparent;padding:6px 12px;border-radius:9px;font-weight:650;font-size:.84rem;color:var(--ink2);display:inline-flex;align-items:center;gap:6px}
.seg button[aria-pressed="true"]{background:var(--surface);color:var(--ink);box-shadow:var(--shadow)}
input[type=color]{width:42px;height:42px;border:1px solid var(--line2);border-radius:10px;padding:3px;background:var(--surface);cursor:pointer}
input[type=range]{width:100%;accent-color:var(--mint-strong)}

/* Hộp thoại + toast */
.modal-wrap{position:fixed;inset:0;z-index:300;display:grid;place-items:center;padding:16px;background:rgba(8,20,30,.45)}
.modal{width:min(560px,100%);max-height:min(88vh,860px);display:flex;flex-direction:column;background:var(--surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);border:1px solid var(--line);outline:none}
.modal.wide{width:min(900px,100%)}
.modal-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px 18px 8px}
.modal-head h2{margin:0;font-size:1.2rem}
.modal-body{padding:6px 18px 12px;overflow-y:auto}
.modal-foot{display:flex;justify-content:flex-end;gap:8px;flex-wrap:wrap;padding:12px 18px 16px;border-top:1px solid var(--line)}
.toast{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom));transform:translate(-50%,20px);opacity:0;pointer-events:none;z-index:400;display:flex;align-items:center;gap:12px;max-width:min(92vw,560px);padding:12px 16px;border-radius:14px;background:#102a3d;color:#f2f7f9;box-shadow:var(--shadow-lg);transition:opacity .2s,transform .2s;font-size:.92rem}
.toast.show{opacity:1;transform:translate(-50%,0);pointer-events:auto}
.toast.t-ok{background:#11523f}.toast.t-warn{background:#6b4609}.toast.t-error{background:#7a1f1b}
.toast-act{border:0;background:#ffffff26;color:#fff;font-weight:700;padding:6px 10px;border-radius:9px}

/* Logo động (chỉ transform/opacity khi lặp; vẽ nét một lần khi tải) */
.logo-mark{display:block;flex:none;overflow:visible}
.logo-mark .lg-line{stroke-dasharray:100;stroke-dashoffset:0}
.logo-mark .lg-arrow,.logo-mark .lg-cursor,.logo-mark .lg-bars rect{transform-box:fill-box}
.logo-mark .lg-ripple{opacity:0;transform-box:fill-box;transform-origin:center}
:root[data-motion="on"] .logo-mark.animated .lg-line{animation:lg-draw 1.1s .15s cubic-bezier(.6,.05,.3,1) both}
:root[data-motion="on"] .logo-mark.animated .lg-arrow{animation:lg-pop .4s 1.1s ease-out both}
:root[data-motion="on"] .logo-mark.animated .lg-bars rect{transform-origin:bottom;animation:lg-grow .7s ease-out both}
:root[data-motion="on"] .logo-mark.animated .lg-bars rect:nth-child(2){animation-delay:.08s}
:root[data-motion="on"] .logo-mark.animated .lg-bars rect:nth-child(3){animation-delay:.16s}
:root[data-motion="on"] .logo-mark.animated .lg-bars rect:nth-child(4){animation-delay:.24s}
:root[data-motion="on"] .logo-mark.animated .lg-cursor{animation:lg-cursor 1s .55s cubic-bezier(.3,1.4,.5,1) both}
:root[data-motion="on"] .logo-mark.animated .lg-ripple{animation:lg-ripple .9s 1.35s ease-out both}
:root[data-motion="off"] .logo-mark .lg-cursor{animation:none}
@keyframes lg-draw{from{stroke-dashoffset:100}to{stroke-dashoffset:0}}
@keyframes lg-pop{from{opacity:0;transform:scale(.4)}to{opacity:1;transform:none}}
@keyframes lg-grow{from{transform:scaleY(0)}to{transform:scaleY(1)}}
@keyframes lg-cursor{from{opacity:0;transform:translate(14px,14px) scale(.7)}to{opacity:1;transform:none}}
@keyframes lg-ripple{0%{opacity:.9;transform:scale(.3)}100%{opacity:0;transform:scale(1.5)}}
.brand-row:hover .logo-mark .lg-cursor{transform:translate(-1px,-1px)}

/* Hiệu ứng xuất hiện nhẹ — tắt khi tiết kiệm pin */
:root[data-motion="on"] .view-enter{animation:view-in .28s ease-out both}
@keyframes view-in{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
:root[data-motion="on"] .float-soft{animation:float-in .9s .15s cubic-bezier(.2,.8,.2,1) both}
@keyframes float-in{from{opacity:0;transform:translateY(18px) scale(.97)}to{opacity:1;transform:none}}

/* Minh họa SVG (màu theo chủ đề) */
.fig{display:block;width:100%;height:auto}
.f-bg{fill:var(--f-bg)}.f-card{fill:var(--f-card)}.f-line{fill:var(--f-line)}.f-ink{fill:var(--f-ink)}.f-navy{fill:var(--f-navy)}.f-mint{fill:var(--f-mint)}.f-mint2{fill:var(--f-mint2)}.f-peach{fill:var(--f-peach)}.f-lilac{fill:var(--f-lilac)}.f-sun{fill:var(--f-sun)}.f-rose{fill:var(--f-rose)}.f-sky{fill:var(--f-sky)}
.s-ink{fill:none;stroke:var(--f-ink)}.s-line{fill:none;stroke:var(--f-line)}.s-mint{fill:none;stroke:var(--f-mint)}.s-navy{fill:none;stroke:var(--f-navy)}.s-peach{fill:none;stroke:var(--f-peach)}
.t-ink{fill:var(--f-ink)}.t-sub{fill:var(--f-sub)}.t-inv{fill:var(--f-inv)}
.fig-box{border-radius:var(--radius);background:var(--f-bg);padding:8px;border:1px solid var(--line)}
.fig-box figcaption{font-size:.8rem;color:var(--sub);text-align:center;padding:4px 8px 2px}

/* ---------- Tổng quan ---------- */
.hero-dash{display:grid;grid-template-columns:1fr;gap:18px;align-items:stretch;margin-bottom:18px}
@media (min-width:1280px){.hero-dash{grid-template-columns:minmax(0,1.45fr) minmax(280px,.55fr)}}
.hero-card{position:relative;overflow:hidden;border-radius:var(--radius-lg);padding:clamp(22px,3.5vw,40px);background:linear-gradient(135deg,var(--mint-bg),var(--sky-bg) 60%,var(--peach-bg));border:1px solid var(--line);container-type:inline-size}
.hero-inner{display:grid;grid-template-columns:1fr;gap:18px;align-items:center}
@container (min-width:500px){.hero-inner{grid-template-columns:minmax(0,1fr) minmax(170px,36%)}}
.hero-card h1{max-width:640px}
.hero-card .lead{color:var(--ink2)}
.hero-card .hero-art{width:100%;max-width:340px;margin:0 auto;pointer-events:none}
.hero-card .hero-copy{position:relative;min-width:0}
.prog-card{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:18px 28px;text-align:center}
.prog-card .grid{flex:1;min-width:220px}
@media (min-width:1280px){.prog-card{flex-direction:column}}
.stat{display:flex;flex-direction:column;gap:4px}
.stat b{font-size:1.9rem;font-family:var(--display);line-height:1.1}
.stat span{color:var(--sub);font-size:.86rem}
.stat .ic{color:var(--mint-strong)}
.course-chip{display:flex;gap:12px;align-items:center;padding:12px;border-radius:14px;border:1px solid var(--line);background:var(--surface);text-decoration:none;color:inherit}
.course-chip:hover{border-color:var(--line2)}
.course-chip .cn{display:grid;place-items:center;width:40px;height:40px;border-radius:12px;font-weight:800;flex:none}
.course-chip .meta{flex:1;min-width:0}
.course-chip .meta b{display:block;font-size:.92rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.c-mint{background:var(--mint-bg);color:var(--mint-ink)}.c-navy{background:var(--sky-bg);color:var(--sky-ink)}.c-peach{background:var(--peach-bg);color:var(--peach-ink)}.c-lilac{background:var(--lilac-bg);color:var(--lilac-ink)}.c-sky{background:var(--sky-bg);color:var(--sky-ink)}.c-sand{background:var(--sand-bg);color:var(--sand-ink)}.c-rose{background:var(--rose-bg);color:var(--rose-ink)}
.task{display:flex;gap:12px;align-items:flex-start;padding:12px 0;border-bottom:1px solid var(--line)}
.task:last-child{border-bottom:0}
.task .ic-box{display:grid;place-items:center;width:36px;height:36px;border-radius:11px;background:var(--mint-bg);color:var(--mint-ink);flex:none}
.task b{display:block;font-size:.93rem}
.skill{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:12px;border:1px dashed var(--line2);font-size:.86rem;font-weight:650;color:var(--sub)}
.skill.done{border-style:solid;border-color:transparent;background:var(--ok-bg);color:var(--ok)}
.skill .ic{flex:none}
.flow{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:10px;counter-reset:fl}
.flow a{position:relative;display:flex;flex-direction:column;gap:6px;padding:14px;border-radius:14px;border:1px solid var(--line);background:var(--surface);text-decoration:none;color:inherit;font-size:.86rem}
.flow a b{font-size:.92rem}
.flow a .ic{color:var(--mint-strong)}
.flow a::after{counter-increment:fl;content:counter(fl);position:absolute;top:10px;right:12px;font-size:.72rem;font-weight:800;color:var(--sub)}

/* ---------- Khóa học ---------- */
.course-card{display:flex;flex-direction:column;overflow:hidden;padding:0;text-decoration:none;color:inherit;transition:transform .18s ease,border-color .18s}
.course-card:hover{border-color:var(--line2);transform:translateY(-2px)}
.course-card .cover{aspect-ratio:16/9;display:grid;place-items:center;padding:10px 18px 0;border-bottom:1px solid var(--line)}
.course-card .cover .fig{max-height:100%}
.course-card .body{padding:16px 18px 18px;display:flex;flex-direction:column;gap:8px;flex:1}
.course-card .body h3{margin:0}
.course-card .foot{margin-top:auto;display:flex;align-items:center;gap:10px}
.course-card .foot .bar{flex:1}
.lesson-layout{display:grid;grid-template-columns:300px minmax(0,1fr);gap:20px;align-items:start}
.lesson-nav{position:sticky;top:calc(var(--top-h) + 16px);max-height:calc(100vh - var(--top-h) - 32px);overflow-y:auto;padding:12px}
.lesson-nav a{display:flex;gap:10px;align-items:flex-start;padding:9px 10px;border-radius:11px;text-decoration:none;color:var(--ink2);font-size:.88rem;line-height:1.35}
.lesson-nav a:hover{background:var(--surface2)}
.lesson-nav a[aria-current="page"]{background:var(--mint-bg);color:var(--ink);font-weight:650}
.lesson-nav .ln{display:grid;place-items:center;width:24px;height:24px;border-radius:8px;border:1px solid var(--line2);font-size:.72rem;font-weight:800;flex:none;color:var(--sub);background:var(--surface)}
.lesson-nav .done .ln{background:var(--ok);border-color:var(--ok);color:#fff}
.lesson-nav .track{font-size:.72rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--sub);padding:12px 10px 4px}
.lesson{max-width:820px}
.lesson .meta-row{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:6px}
.lesson h1{font-size:clamp(1.7rem,3vw,2.4rem)}
.lesson .objectives{margin:14px 0 18px;padding:14px 16px;border-radius:var(--radius-sm);background:var(--surface2);border:1px solid var(--line)}
.lesson .objectives ul{margin:6px 0 0;padding-left:20px}
.lesson-body{font-size:1.02rem;line-height:1.75}
.lesson-body h3{margin:1.6em 0 .5em;font-size:1.2rem}
.lesson-body ul,.lesson-body ol{padding-left:22px}
.lesson-body li{margin:.35em 0}
.lesson-body .figure{margin:18px 0}
.lesson-body .figure .fig-box{max-width:560px;margin:0 auto}
.callout{display:flex;gap:12px;padding:14px 16px;border-radius:var(--radius-sm);margin:16px 0;font-size:.97rem;line-height:1.6}
.callout .ic{margin-top:3px}
.callout.tip{background:var(--mint-bg)}.callout.tip .ic{color:var(--mint-ink)}
.callout.warn{background:var(--warn-bg)}.callout.warn .ic{color:var(--warn)}
.callout.example{background:var(--sky-bg)}.callout.example .ic{color:var(--sky-ink)}
.callout b.t{display:block;margin-bottom:2px}
.compare{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:16px 0}
.compare>div{padding:14px 16px;border-radius:var(--radius-sm);border:1px solid var(--line)}
.compare .good{background:var(--ok-bg)}.compare .bad{background:var(--danger-bg)}
.compare h4{display:flex;align-items:center;gap:8px;margin-bottom:6px}
.compare .good h4{color:var(--ok)}.compare .bad h4{color:var(--danger)}
.compare ul{margin:0;padding-left:20px;font-size:.94rem}
.formula{margin:16px 0;padding:14px 16px;border-radius:var(--radius-sm);background:var(--surface2);border:1px dashed var(--line2)}
.formula code{font-size:1rem;font-weight:700;color:var(--ink)}
.channel-card{margin:16px 0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.channel-card .ch-fit{padding:14px 16px;background:var(--sand-bg)}
.channel-card .ch-grid{display:grid;grid-template-columns:1fr 1fr;gap:0}
.channel-card .ch-grid>div{padding:14px 16px;border-top:1px solid var(--line)}
.channel-card .ch-grid>div:nth-child(odd){border-right:1px solid var(--line)}
.channel-card h4{font-size:.8rem;letter-spacing:.06em;text-transform:uppercase;color:var(--sub);margin-bottom:6px}
.channel-card ul,.channel-card ol{margin:0;padding-left:18px;font-size:.93rem}
.exercise{padding:18px;border-radius:var(--radius);border:2px dashed color-mix(in srgb,var(--mint-strong) 45%,transparent);background:var(--surface)}
.quiz-q{margin:18px 0}
.quiz-q .opts{display:grid;gap:8px;margin-top:10px}
.quiz-opt{display:flex;gap:10px;align-items:flex-start;text-align:left;padding:11px 14px;border-radius:12px;border:1px solid var(--line2);background:var(--surface);font-size:.95rem;width:100%}
.quiz-opt:hover:not(:disabled){border-color:var(--mint-strong)}
.quiz-opt .k{display:grid;place-items:center;width:24px;height:24px;border-radius:7px;background:var(--surface2);font-weight:800;font-size:.78rem;flex:none}
.quiz-opt.right{background:var(--ok-bg);border-color:var(--ok)}
.quiz-opt.wrong{background:var(--danger-bg);border-color:var(--danger)}
.quiz-opt:disabled{cursor:default}
.why{margin-top:8px;padding:10px 12px;border-radius:10px;background:var(--surface2);font-size:.9rem}
.sources{display:flex;flex-wrap:wrap;gap:8px}
.sources a{display:inline-flex;align-items:center;gap:6px;padding:7px 11px;border-radius:10px;border:1px solid var(--line);background:var(--surface);font-size:.82rem;text-decoration:none;color:var(--ink2)}

/* ---------- Trình dựng ---------- */
.builder{display:grid;grid-template-columns:minmax(340px,440px) minmax(0,1fr);gap:16px;align-items:start}
.steps-bar{display:flex;gap:6px;overflow-x:auto;padding:4px;margin-bottom:14px;border-radius:14px;background:var(--surface2);border:1px solid var(--line);scrollbar-width:none}
.steps-bar::-webkit-scrollbar{display:none}
.step-btn{flex:1 0 auto;display:flex;align-items:center;gap:8px;padding:8px 12px;border:0;border-radius:10px;background:transparent;font-weight:650;font-size:.84rem;color:var(--sub);white-space:nowrap}
.step-btn .n{display:grid;place-items:center;width:22px;height:22px;border-radius:7px;background:var(--surface);border:1px solid var(--line2);font-size:.72rem;font-weight:800}
.step-btn[aria-current="step"]{background:var(--surface);color:var(--ink);box-shadow:var(--shadow)}
.step-btn[aria-current="step"] .n{background:var(--primary);border-color:var(--primary);color:var(--on-primary)}
.step-btn.done .n{background:var(--ok-bg);color:var(--ok);border-color:transparent}
.panel{position:sticky;top:calc(var(--top-h) + 12px);max-height:calc(100vh - var(--top-h) - 24px);overflow-y:auto;scrollbar-gutter:stable}
.panel-sec{border-top:1px solid var(--line);padding:14px 0}
.panel-sec:first-child{border-top:0;padding-top:0}
.panel-sec>h3{display:flex;align-items:center;gap:8px;font-size:.98rem}
.acc{border:1px solid var(--line);border-radius:14px;background:var(--surface);margin-bottom:8px;overflow:hidden}
.acc>summary{list-style:none;display:flex;align-items:center;gap:10px;padding:11px 12px;cursor:pointer;font-weight:650;font-size:.92rem}
.acc>summary::-webkit-details-marker{display:none}
.acc>summary .chev{margin-left:auto;transition:transform .2s;color:var(--sub)}
.acc[open]>summary .chev{transform:rotate(180deg)}
.acc[open]>summary{border-bottom:1px solid var(--line)}
.acc .acc-body{padding:12px;display:flex;flex-direction:column;gap:12px}
.acc.selected{border-color:var(--mint-strong);box-shadow:0 0 0 3px color-mix(in srgb,var(--mint-strong) 20%,transparent)}
.sec-list{display:flex;flex-direction:column;gap:6px}
.sec-row{display:flex;align-items:center;gap:8px;padding:8px 8px 8px 4px;border-radius:12px;border:1px solid var(--line);background:var(--surface);touch-action:pan-y}
.sec-row.dragging{opacity:.9;box-shadow:var(--shadow-lg);border-color:var(--mint-strong);z-index:5;position:relative}
.sec-row.hidden-sec{opacity:.55}
.sec-row .handle{display:grid;place-items:center;width:30px;height:36px;border:0;background:transparent;color:var(--sub);cursor:grab;touch-action:none;flex:none;border-radius:8px}
.sec-row .handle:active{cursor:grabbing}
.sec-row .nm{flex:1;min-width:0}
.sec-row .nm b{display:block;font-size:.88rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sec-row .nm small{color:var(--sub);font-size:.74rem}
.sec-row .acts{display:flex;gap:2px}
.sec-row .acts button{width:32px;height:32px;border:0;border-radius:8px;background:transparent;color:var(--sub);display:grid;place-items:center}
.sec-row .acts button:hover{background:var(--surface2);color:var(--ink)}
.drop-line{height:3px;border-radius:3px;background:var(--mint-strong)}
.list-item{border:1px solid var(--line);border-radius:12px;padding:10px;display:flex;flex-direction:column;gap:10px;background:var(--surface2)}
.list-item .li-head{display:flex;align-items:center;gap:6px;font-size:.8rem;font-weight:700;color:var(--sub)}
.list-item .li-head .sp{flex:1}
.list-item .li-head button{width:28px;height:28px;border:0;border-radius:7px;background:transparent;color:var(--sub);display:grid;place-items:center}
.list-item .li-head button:hover{background:var(--surface);color:var(--ink)}
.img-field{display:flex;gap:10px;align-items:center}
.img-field .thumb{width:64px;height:48px;border-radius:9px;border:1px solid var(--line2);background:var(--surface2) center/cover no-repeat;flex:none;display:grid;place-items:center;color:var(--sub)}
.icon-pick{display:grid;grid-template-columns:repeat(auto-fill,minmax(36px,1fr));gap:4px;max-height:160px;overflow-y:auto;padding:4px;border:1px solid var(--line);border-radius:10px}
.icon-pick button{height:36px;border:1px solid transparent;border-radius:8px;background:transparent;display:grid;place-items:center;color:var(--ink2)}
.icon-pick button[aria-pressed="true"]{background:var(--mint-bg);border-color:var(--mint-strong);color:var(--mint-ink)}
.preview-col{position:sticky;top:calc(var(--top-h) + 12px);min-width:0}
.preview-bar{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:10px}
.preview-bar .sp{flex:1}
.device{position:relative;margin:0 auto;background:var(--surface);border:1px solid var(--line2);border-radius:16px;overflow:hidden;box-shadow:var(--shadow);height:calc(100vh - var(--top-h) - 110px);min-height:480px}
.device .scaler{transform-origin:0 0;position:absolute;top:0;left:0}
.device iframe{border:0;display:block;background:#fff}
.device-chrome{display:flex;align-items:center;gap:6px;padding:8px 12px;border-bottom:1px solid var(--line);background:var(--surface2);font-size:.76rem;color:var(--sub)}
.device-chrome i{width:9px;height:9px;border-radius:50%;background:var(--line2)}
.device-chrome .url{flex:1;margin-left:8px;padding:3px 10px;border-radius:7px;background:var(--surface);overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
.status-badge{font-size:.7rem;font-weight:800;padding:3px 8px;border-radius:99px;letter-spacing:.02em}
.status-badge.draft{background:var(--warn-bg);color:var(--warn)}
.status-badge.verified{background:var(--ok-bg);color:var(--ok)}
.swatches{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:8px}
.swatch{border:1px solid var(--line2);border-radius:12px;padding:8px;background:var(--surface);text-align:left;font-size:.78rem;font-weight:650}
.swatch .dots{display:flex;gap:4px;margin-bottom:6px}
.swatch .dots i{width:18px;height:18px;border-radius:50%;border:1px solid #0001}
.swatch[aria-pressed="true"]{border-color:var(--mint-strong);box-shadow:0 0 0 2px color-mix(in srgb,var(--mint-strong) 30%,transparent)}
.color-row{display:flex;align-items:center;gap:10px}
.color-row .input{flex:1;font-family:var(--mono)}
.checks .ck{display:flex;gap:12px;align-items:flex-start;padding:12px 0;border-bottom:1px solid var(--line)}
.checks .ck:last-child{border-bottom:0}
.ck .dot{display:grid;place-items:center;width:28px;height:28px;border-radius:50%;flex:none}
.ck .dot.ok{background:var(--ok-bg);color:var(--ok)}.ck .dot.critical{background:var(--danger-bg);color:var(--danger)}.ck .dot.warning{background:var(--warn-bg);color:var(--warn)}.ck .dot.info{background:var(--info-bg);color:var(--info)}
.ck .b{flex:1;min-width:0}
.ck .b b{display:block;font-size:.93rem}
.ck .b .d{font-size:.84rem;color:var(--sub);overflow-wrap:anywhere}
.ck .b .fx{font-size:.84rem;margin-top:4px}
.ck .acts{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px}
.sev-sum{display:flex;gap:8px;flex-wrap:wrap}
.serp{padding:14px 16px;border-radius:12px;border:1px solid var(--line);background:#fff;color:#202124;font-family:Arial,sans-serif}
.serp .u{font-size:12.5px;color:#4d5156;display:flex;align-items:center;gap:8px}
.serp .u i{width:24px;height:24px;border-radius:50%;background:#e8f0fe;display:inline-block}
.serp .t{font-size:19px;color:#1a0dab;line-height:1.3;margin:4px 0 3px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.serp .d{font-size:14px;color:#4d5156;line-height:1.55;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.mobile-preview-btn{display:none}

/* ---------- Thư viện ---------- */
.tpl-card{padding:0;overflow:hidden;display:flex;flex-direction:column}
.tpl-thumb{aspect-ratio:4/3;border-bottom:1px solid var(--line);display:block;background:var(--surface2)}
.tpl-thumb svg{width:100%;height:100%;display:block}
.tpl-card .body{padding:14px 16px 16px;display:flex;flex-direction:column;gap:8px;flex:1}
.tpl-card .body h3{margin:0}
.tpl-card .acts{margin-top:auto;display:flex;gap:8px;flex-wrap:wrap}

/* ---------- Công cụ & trò chơi ---------- */
.tool-tile{display:flex;gap:14px;align-items:flex-start;padding:16px;text-decoration:none;color:inherit;transition:border-color .15s,transform .15s}
.tool-tile:hover{border-color:var(--line2);transform:translateY(-1px)}
.tool-tile .ti{display:grid;place-items:center;width:44px;height:44px;border-radius:13px;flex:none}
.tool-tile b{display:block}
.tool-tile p{margin:2px 0 0;font-size:.86rem;color:var(--sub)}
.result-list{display:flex;flex-direction:column;gap:8px}
.result{display:flex;gap:10px;align-items:flex-start;padding:10px 12px;border-radius:12px;border:1px solid var(--line);background:var(--surface)}
.result .tx{flex:1;min-width:0;overflow-wrap:anywhere}
.result .tx small{display:block;color:var(--sub);font-size:.76rem}
.result .acts{display:flex;gap:4px;flex:none}
.calc-out{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px}
.kpi{padding:12px 14px;border-radius:12px;background:var(--surface2);border:1px solid var(--line)}
.kpi span{display:block;font-size:.76rem;color:var(--sub);font-weight:650}
.kpi b{display:block;font-size:1.25rem;font-family:var(--display);margin-top:2px}
.kpi .tag{display:inline-block;margin-top:4px;font-size:.68rem;font-weight:800;padding:2px 7px;border-radius:99px}
.kpi .tag.real{background:var(--ok-bg);color:var(--ok)}.kpi .tag.assumed{background:var(--warn-bg);color:var(--warn)}
.cal{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:6px}
.cal .d{min-height:86px;padding:8px;border-radius:10px;border:1px solid var(--line);background:var(--surface);font-size:.74rem;display:flex;flex-direction:column;gap:4px}
.cal .d b{font-size:.78rem}
.cal .d .tk{padding:2px 6px;border-radius:6px;background:var(--surface2);line-height:1.3}
.cal .d.done{background:var(--ok-bg)}
.game-card{display:flex;flex-direction:column;gap:10px;text-decoration:none;color:inherit}
.game-card .gfig{border-radius:12px;background:var(--f-bg);padding:6px}
.choice{display:block;width:100%;text-align:left;padding:14px 16px;border-radius:14px;border:2px solid var(--line);background:var(--surface);font-size:1rem;line-height:1.45}
.choice:hover:not(:disabled){border-color:var(--mint-strong)}
.choice.right{border-color:var(--ok);background:var(--ok-bg)}
.choice.wrong{border-color:var(--danger);background:var(--danger-bg)}
.choice.picked{border-color:var(--navy2);background:var(--sky-bg)}
.order-list{display:flex;flex-direction:column;gap:6px}
.order-item{display:flex;align-items:center;gap:8px;padding:10px 12px;border-radius:12px;border:1px solid var(--line2);background:var(--surface);font-weight:650}
.order-item .n{display:grid;place-items:center;width:26px;height:26px;border-radius:8px;background:var(--surface2);font-size:.78rem;flex:none}
.order-item .sp{flex:1}
.code-line{display:flex;gap:10px;align-items:flex-start;width:100%;text-align:left;padding:8px 10px;border:1px solid transparent;border-radius:8px;background:transparent;font-family:var(--mono);font-size:.8rem;color:var(--ink);overflow-wrap:anywhere}
.code-line:hover{background:var(--surface2)}
.code-line .ln{color:var(--sub);min-width:22px;text-align:right;flex:none}
.code-line.picked{border-color:var(--navy2);background:var(--sky-bg)}
.code-line.right{border-color:var(--ok);background:var(--ok-bg)}
.code-line.missed{border-color:var(--warn);background:var(--warn-bg)}
.code-line.wrong{border-color:var(--danger);background:var(--danger-bg)}
.score-big{font-family:var(--display);font-size:3rem;line-height:1}
.alloc{display:grid;grid-template-columns:150px minmax(0,1fr) 92px;gap:10px;align-items:center;padding:6px 0}

/* ---------- Dự án ---------- */
.proj-card{padding:0;overflow:hidden;display:flex;flex-direction:column}
.proj-card .thumb{aspect-ratio:16/9;border-bottom:1px solid var(--line);background:var(--surface2)}
.proj-card .thumb svg{width:100%;height:100%;display:block}
.proj-card .body{padding:14px 16px;display:flex;flex-direction:column;gap:6px;flex:1}
.proj-card .acts{display:flex;gap:6px;flex-wrap:wrap;margin-top:auto;padding-top:8px}

/* Tài liệu (hướng dẫn, điều khoản) */
.doc{max-width:860px}
.doc h2{margin-top:1.6em}
.doc h3{margin-top:1.3em}
.doc ul,.doc ol{padding-left:22px}
.doc li{margin:.3em 0}
.toc{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}

/* ---------- Đáp ứng ---------- */
@media (max-width:1180px){
  .builder{grid-template-columns:minmax(320px,400px) minmax(0,1fr)}
  .g4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .flow{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:980px){
  :root{--top-h:58px}
  .shell{display:block}
  .side{position:fixed;left:0;top:0;bottom:0;width:min(86vw,320px);transform:translateX(-105%);transition:transform .25s ease;box-shadow:var(--shadow-lg);border-right:0;padding-bottom:calc(14px + env(safe-area-inset-bottom))}
  body.drawer-open .side{transform:none}
  body.drawer-open .scrim{display:block;position:fixed;inset:0;z-index:35;background:rgba(8,20,30,.4)}
  .topbar .mlogo{display:flex;align-items:center;gap:8px;text-decoration:none;color:var(--ink);font-family:var(--display);font-weight:700;min-width:0}
  .topbar .crumb{display:none}
  .topbar .mlogo span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .topbar .spacer{flex:1}
  .bottom-nav{display:grid;grid-template-columns:repeat(5,1fr);position:fixed;left:0;right:0;bottom:0;z-index:45;background:var(--surface);border-top:1px solid var(--line);padding:6px 4px calc(6px + env(safe-area-inset-bottom))}
  .bottom-nav a,.bottom-nav button{display:flex;flex-direction:column;align-items:center;gap:2px;padding:6px 2px;border:0;background:transparent;color:var(--sub);font-size:.68rem;font-weight:700;text-decoration:none;border-radius:10px;min-height:48px}
  .bottom-nav [aria-current="page"]{color:var(--mint-ink)}
  .bottom-nav [aria-current="page"] .ic{color:var(--mint-strong)}
  .main-col{padding-bottom:calc(66px + env(safe-area-inset-bottom))}
  .hero-dash{grid-template-columns:1fr}
  .lesson-layout{grid-template-columns:1fr}
  .lesson-nav{position:static;max-height:none}
  .lesson-nav-list{display:none}
  .lesson-nav.open .lesson-nav-list{display:block}
  .builder{grid-template-columns:1fr}
  .panel{position:static;max-height:none;overflow:visible}
  .preview-col{position:fixed;inset:0;z-index:60;background:var(--bg);padding:10px 10px calc(10px + env(safe-area-inset-bottom));display:none;flex-direction:column}
  body.show-preview .preview-col{display:flex}
  body.show-preview .bottom-nav{display:none}
  .preview-col .device{flex:1;height:auto;min-height:0}
  .mobile-preview-btn{display:inline-flex;position:fixed;right:14px;bottom:calc(76px + env(safe-area-inset-bottom));z-index:44;box-shadow:var(--shadow-lg)}
  .toast{bottom:calc(80px + env(safe-area-inset-bottom))}
}
@media (max-width:720px){
  .g2,.g3,.g4,.form-grid{grid-template-columns:1fr}
  .flow{grid-template-columns:repeat(2,minmax(0,1fr))}
  .compare{grid-template-columns:1fr}
  .channel-card .ch-grid{grid-template-columns:1fr}
  .channel-card .ch-grid>div:nth-child(odd){border-right:0}
  .hero-card .hero-art{max-width:260px}
  .page-head{align-items:flex-start}
  .cal{grid-template-columns:repeat(2,minmax(0,1fr))}
  .alloc{grid-template-columns:1fr 92px}
  .alloc .lbl{grid-column:1/-1}
  .modal-wrap{place-items:end center;padding:0}
  .modal{width:100%;max-height:92vh;border-radius:20px 20px 0 0}
  .btn{white-space:normal}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
:root[data-saving="on"] *{transition:none!important}
:root[data-saving="on"] .hero-card{background:var(--surface2)}
@media print{.side,.topbar,.bottom-nav,.app-foot,.mobile-preview-btn{display:none!important}.shell{display:block}#view{padding:0}}

/* Thanh điều hướng thu gọn (trình dựng trên màn hình vừa) */
@media (min-width:981px){
  body.compact-nav .shell{grid-template-columns:76px minmax(0,1fr)}
  body.compact-nav .side{padding:14px 10px;align-items:center}
  body.compact-nav .brand-row{padding:4px 0 8px}
  body.compact-nav .brand-row>span,body.compact-nav .nav a>span,body.compact-nav .side-card,body.compact-nav .side-foot{display:none}
  body.compact-nav .nav a{justify-content:center;padding:11px;width:52px}
  body.compact-nav .nav a[aria-current="page"]::before{left:-10px}
}
#lnavToggle{display:none}
@media (max-width:1180px){
  .lesson-layout{grid-template-columns:1fr}
  .lesson-nav{position:static;max-height:none}
  #lnavToggle{display:inline-flex}
  .lesson-nav-list{display:none}
  .lesson-nav.open .lesson-nav-list{display:block}
}

.split-a,.split-b{grid-template-columns:1fr}
@media (min-width:1000px){.split-a{grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr)}.split-b{grid-template-columns:minmax(300px,.8fr) minmax(0,1.2fr)}}
[hidden]{display:none!important}
@media (max-width:480px){#powerBtn,.topbar a.icon-btn[href="#/cai-dat"]{display:none}.topbar{gap:6px;padding:8px 10px}.topbar .mlogo span{font-size:1rem}}