:root{
  --navy:#103a72;--navy-deep:#082c5c;--navy-2:#1c4f8f;--orange:#ff7d18;--orange-soft:#fff2e7;
  --green:#10a45c;--red:#ef4b4b;--blue:#2186e5;--cyan:#1fb7d6;--bg:#f4f8fd;--card:#fff;
  --text:#18345c;--muted:#6682a5;--line:#dfeaf5;--shadow:0 12px 32px rgba(33,77,125,.10);
  --font:"Segoe UI Variable","Segoe UI","Noto Sans",Tahoma,Arial,sans-serif;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}html,body{margin:0;min-height:100%;font-family:var(--font);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body{font-size:15px}button,input,select,textarea{font-family:inherit}a{color:inherit;text-decoration:none}img{max-width:100%}
h1,h2,h3,p{margin-top:0}.the{background:var(--card);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow)}
.nut{border:0;border-radius:12px;padding:10px 15px;font:inherit;font-weight:800;cursor:pointer;transition:.16s transform,.16s box-shadow}.nut:hover{transform:translateY(-1px)}.nut-chinh{background:linear-gradient(135deg,#ff8f28,var(--orange));color:#fff;box-shadow:0 8px 18px rgba(255,125,24,.22)}.nut-phu{background:linear-gradient(135deg,var(--navy-2),var(--navy-deep));color:#fff}.nut-nhe{background:#f0f6fc;color:var(--navy);border:1px solid #dce8f5}

/* Dashboard dùng chung */
.app-dashboard{min-height:100vh;display:grid;grid-template-columns:260px minmax(0,1fr);background:radial-gradient(circle at 28% 0,#eef7ff 0,transparent 30%),linear-gradient(180deg,#f8fbff,#f1f7fd)}
.sidebar{position:sticky;top:0;height:100vh;padding:24px 16px 18px;background:linear-gradient(180deg,#fff,#f7fbff);border-right:1px solid #e3edf7;display:flex;flex-direction:column;z-index:20}
.sidebar-brand{display:flex;align-items:center;gap:10px;padding:0 8px 22px}.sidebar-logo{width:176px;height:auto;display:block}.sidebar-title{font-weight:900;color:var(--navy-deep)}
.sidebar-nav{display:grid;gap:8px}.sidebar-link{display:flex;align-items:center;gap:12px;padding:13px 15px;border-radius:13px;font-weight:750;color:#55759a;transition:.16s background,.16s color,.16s transform}.sidebar-link:hover{background:#eef6ff;color:var(--navy);transform:translateX(2px)}.sidebar-link.active{color:#fff;background:linear-gradient(135deg,#ff9631,#ff7611);box-shadow:0 10px 22px rgba(255,125,24,.22)}.nav-icon{width:28px;text-align:center;font-size:20px}
.sidebar-spacer{flex:1}.sidebar-note{padding:16px 14px;border-radius:18px;background:linear-gradient(145deg,#eaf5ff,#f9fcff);border:1px solid #dceafa;text-align:center;color:#5f7da0;line-height:1.5;font-size:13px}.sidebar-note strong{color:var(--navy);display:block;margin-bottom:4px}
.dashboard-main{min-width:0;padding:26px 30px 18px;max-width:1600px;width:100%;margin:0 auto}.dashboard-topbar{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;margin-bottom:20px}.welcome h1{font-size:clamp(31px,3.2vw,48px);line-height:1.02;color:var(--navy-deep);margin:0}.welcome h1 em{font-style:normal;color:var(--orange)}.welcome p{font-size:18px;color:var(--muted);margin:8px 0 0}.top-pill{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid #e2edf7;border-radius:999px;padding:11px 18px;box-shadow:var(--shadow);color:var(--navy);font-weight:800;white-space:nowrap}.top-pill span{font-size:23px}.top-pill small{display:block;color:#7b95b4;font-weight:600;margin-top:2px}
.sensor-shortcuts{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px;margin:12px 0 22px}.sensor-shortcut{min-height:112px;padding:14px;border-radius:17px;background:#fff;border:1px solid #e3edf7;box-shadow:0 8px 22px rgba(33,77,125,.08);display:flex;align-items:center;gap:12px;transition:.16s transform,.16s box-shadow}.sensor-shortcut:hover{transform:translateY(-2px);box-shadow:0 12px 25px rgba(33,77,125,.13)}.sensor-shortcut img{width:70px;height:70px;object-fit:contain;border-radius:14px;background:#f7fbff;padding:5px}.sensor-shortcut h3{margin:0 0 5px;font-size:16px;color:var(--navy-deep)}.sensor-shortcut p{margin:0;color:var(--muted);font-size:12px;line-height:1.35}
.dashboard-card{background:#fff;border:1px solid #e1ebf5;border-radius:22px;box-shadow:var(--shadow);padding:22px}.section-head{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:16px}.section-head h2{margin:0;color:var(--navy-deep);font-size:23px}.section-head p{margin:4px 0 0;color:var(--muted)}
.home-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:18px}.course-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.course-card{display:flex;flex-direction:column;min-height:190px;padding:20px;border-radius:18px;border:1px solid #e0eaf5;background:linear-gradient(155deg,#fff,#f8fbff);transition:.16s transform}.course-card:hover{transform:translateY(-2px)}.course-level{display:inline-flex;width:max-content;padding:6px 10px;border-radius:999px;background:#edf5ff;color:var(--navy);font-weight:900;font-size:12px}.course-card h3{font-size:24px;margin:14px 0 5px;color:var(--navy-deep)}.course-card p{color:var(--muted);line-height:1.5;margin:0}.course-card .course-open{margin-top:auto;font-weight:900;color:var(--orange)}
.chan-trang{text-align:center;color:#8299b4;font-size:12px;padding:24px 0 5px}

/* Tương thích các trang lớp cũ */
.khung{max-width:1500px;margin:auto;padding:22px}.dau-trang{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:20px}.thuong-hieu{display:flex;align-items:center;gap:16px}.logo{width:108px;height:auto;filter:drop-shadow(0 6px 16px rgba(11,36,71,.14))}.nhan{margin:0 0 4px;color:var(--orange);font-size:12px;font-weight:900;letter-spacing:.14em}.mo-ta{margin:5px 0 0;color:var(--muted)}h1,h2,h3{color:var(--navy-deep)}h1{margin:0;font-size:clamp(26px,3vw,40px)}.luoi-the{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.the-chon{padding:20px;min-height:180px;display:flex;flex-direction:column;justify-content:space-between;transition:.15s transform}.the-chon:hover{transform:translateY(-2px)}.so-lon{font-size:42px;font-weight:1000;color:var(--orange)}.the-chon p{color:var(--muted);margin:8px 0}.duong-dan{font-weight:900;color:var(--navy-2)}.khoi-tieu-de{margin:16px 0 14px}.khoi-tieu-de h2{margin:0}.khoi-tieu-de p{margin:5px 0 0;color:var(--muted)}

@media(max-width:1180px){.app-dashboard{grid-template-columns:220px 1fr}.sensor-shortcuts{grid-template-columns:repeat(3,1fr)}.home-grid{grid-template-columns:1fr}.course-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:860px){.app-dashboard{display:block}.sidebar{position:relative;height:auto;border-right:0;border-bottom:1px solid #e3edf7}.sidebar-brand{justify-content:center}.sidebar-logo{width:150px}.sidebar-nav{grid-template-columns:repeat(3,minmax(0,1fr))}.sidebar-link{justify-content:center;padding:10px;font-size:0}.sidebar-link .nav-icon{font-size:20px}.sidebar-note{display:none}.dashboard-main{padding:20px 16px}.dashboard-topbar{flex-direction:column}.sensor-shortcuts{grid-template-columns:1fr 1fr}.course-grid{grid-template-columns:1fr}.luoi-the{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.sensor-shortcuts{grid-template-columns:1fr}.top-pill{white-space:normal}.welcome p{font-size:15px}.dashboard-main{padding:16px 10px}.dashboard-card{padding:15px}.luoi-the{grid-template-columns:1fr}.khung{padding:12px}.dau-trang,.thuong-hieu{align-items:flex-start;flex-direction:column}.logo{width:88px}}

/* Typography nền cho các deck trình chiếu ở mọi lớp BKIT. */
:where(.presentation-body,.slide-body){font-size:clamp(20px,1.55vw,25px);line-height:1.42}
:where(.presentation-body,.slide-body) :where(p,li){line-height:1.42}


/* BKIT web-slide media/text ratio utilities */
.bkit-slide-media-text{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:22px;align-items:center}
.bkit-slide-media-text.large-image{grid-template-columns:minmax(0,3fr) minmax(230px,1fr)}
.bkit-slide-media-text.large-image.image-on-right{grid-template-columns:minmax(230px,1fr) minmax(0,3fr)}
.bkit-slide-media-text.sensor-image{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
.bkit-slide-media-text img{width:100%;height:100%;object-fit:contain}

/* Four class cards: balanced two-by-two grouping on the home page. */
#lop-hoc .course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
@media(max-width:640px){#lop-hoc .course-grid{grid-template-columns:1fr}}