:root{--brand:#00a9d6;--brand-dark:#0879b9;--brand-deep:#173b78;--brand-soft:#e9f8fd;--accent:#27c7d9;--text:#18324a;--muted:#6f8091;--line:#dbe9ef;--bg:#f5fafc;--white:#fff;--zalo:#0b7cc1;--zalo-soft:#e8f5fc;--success:#169b62;--warning:#e49a19;--danger:#c94b55;--shadow:0 18px 48px rgba(20,78,116,.09)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:radial-gradient(circle at 88% 0%,rgba(72,208,226,.20),transparent 30%),linear-gradient(180deg,#f9fdff 0,#f4f9fc 100%)}a{color:inherit;text-decoration:none}.page-shell{width:min(1180px,calc(100% - 40px));margin:auto;min-height:100vh}.topbar{min-height:84px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:13px}.official-logo-wrap{min-width:116px;height:44px;display:flex;align-items:center}.official-logo{max-height:44px;max-width:160px;display:block}.logo-fallback{display:none;font-size:23px;font-weight:900;letter-spacing:-.04em;background:linear-gradient(90deg,var(--brand),var(--brand-deep));-webkit-background-clip:text;color:transparent}.official-logo-wrap.fallback .logo-fallback{display:block}.brand-copy{padding-left:13px;border-left:1px solid var(--line)}.brand-copy strong{display:block;font-size:15px}.brand-copy small{display:block;margin-top:4px;color:var(--muted);font-size:9px;font-weight:850;letter-spacing:.08em}.top-aibuddy{padding:10px 14px;border-radius:12px;border:1px solid #cbe7ef;background:rgba(255,255,255,.82);color:var(--brand-dark);font-size:12px;font-weight:800}.hero{display:grid;grid-template-columns:1.35fr .65fr;gap:52px;align-items:center;padding:74px 0 58px}.eyebrow{font-size:11px;font-weight:900;letter-spacing:.15em;color:var(--brand-dark)}h1{font-size:clamp(42px,5.5vw,68px);line-height:1.01;letter-spacing:-.05em;margin:13px 0 20px;max-width:800px}.hero-copy>p{font-size:18px;line-height:1.7;color:var(--muted);max-width:760px;margin:0}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}.btn{min-height:49px;padding:0 18px;border-radius:13px;border:0;display:inline-flex;gap:18px;align-items:center;justify-content:center;font:inherit;font-size:13px;font-weight:850;cursor:pointer}.btn.primary{background:linear-gradient(135deg,var(--brand),var(--brand-dark));color:#fff}.btn.primary:hover{filter:brightness(.95)}.btn.secondary{background:#fff;border:1px solid var(--line);color:var(--text)}.book-summary{padding:28px;border-radius:24px;background:rgba(255,255,255,.90);border:1px solid var(--line);box-shadow:var(--shadow)}.book-kicker{display:block;color:var(--brand-dark);font-size:10px;letter-spacing:.13em;font-weight:900;margin-bottom:8px}.book-summary strong{font-size:25px;letter-spacing:-.03em}.book-summary p{font-size:14px;color:var(--muted);line-height:1.65}.book-tags{display:flex;gap:7px;flex-wrap:wrap;margin-top:20px}.book-tags span{padding:7px 9px;border-radius:9px;background:var(--brand-soft);color:var(--brand-dark);font-size:11px;font-weight:800}.community-section,.training-section,.quick-area{padding:26px 0 60px}.section-title{display:flex;justify-content:space-between;gap:25px;align-items:end;margin-bottom:20px}.section-title h2{font-size:31px;letter-spacing:-.035em;margin:5px 0 6px}.section-title p{margin:0;color:var(--muted);font-size:14px;max-width:720px}.count{font-size:11px;color:var(--muted);border:1px solid var(--line);background:#fff;padding:7px 10px;border-radius:99px;white-space:nowrap}.notice{display:flex;gap:10px;align-items:center;padding:12px 14px;border-radius:13px;background:var(--brand-soft);border:1px solid #d2edf4;color:#527383;font-size:12px;margin-bottom:16px}.notice-icon{width:23px;height:23px;border-radius:99px;display:grid;place-items:center;background:#d8f3f8;color:var(--brand-dark);font-weight:900}.zalo-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.zalo-card{min-height:235px;padding:22px;border:1px solid var(--line);border-radius:21px;background:#fff;display:flex;flex-direction:column}.zalo-card.open:hover,.zalo-card.almost_full:hover{border-color:#b6d9e5;box-shadow:var(--shadow)}.zalo-card.full{opacity:.62}.zalo-top{display:flex;justify-content:space-between;align-items:center}.zalo-number{width:47px;height:47px;border-radius:15px;background:var(--zalo-soft);color:var(--zalo);display:grid;place-items:center;font-size:14px;font-weight:900}.group-status{display:flex;align-items:center;gap:7px;padding:6px 9px;border-radius:99px;background:#eff9f5;color:#44705a;font-size:10px;font-weight:850}.group-status i{width:7px;height:7px;border-radius:99px;background:var(--success)}.zalo-card.almost_full .group-status{background:#fff7e5;color:#8c671c}.zalo-card.almost_full .group-status i{background:var(--warning)}.zalo-card.full .group-status{background:#fff0f1;color:#95525a}.zalo-card.full .group-status i{background:var(--danger)}.zalo-copy{margin-top:24px}.zalo-label{font-size:9px;color:var(--zalo);font-weight:900;letter-spacing:.13em}.zalo-copy h3{font-size:18px;line-height:1.35;margin:6px 0 0}.join-btn{margin-top:auto;padding-top:22px;color:var(--zalo);font-size:12px;font-weight:900;display:flex;justify-content:space-between;align-items:center}.join-btn span{font-size:20px}.join-btn.disabled{color:#87949d}.training-grid{display:grid;gap:12px}.training-card{display:grid;grid-template-columns:140px 1fr auto;gap:20px;align-items:center;padding:20px;border-radius:18px;border:1px solid var(--line);background:#fff}.training-date{padding-right:18px;border-right:1px solid var(--line)}.training-date strong{display:block;color:var(--brand-dark);font-size:16px}.training-date span{display:block;margin-top:5px;color:var(--muted);font-size:12px}.training-format{font-size:9px;font-weight:900;letter-spacing:.12em;color:var(--brand-dark)}.training-copy h3{margin:5px 0;font-size:18px}.training-copy p,.training-copy small{margin:0;color:var(--muted);font-size:12px}.training-copy small{display:block;margin-top:5px}.training-link{color:var(--brand-dark);font-size:12px;font-weight:900}.empty-state{padding:24px;border:1px dashed #bcdbe5;border-radius:17px;background:rgba(255,255,255,.7);color:var(--muted);font-size:14px}.dashboard-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.dashboard-card{min-height:205px;padding:19px;border:1px solid var(--line);border-radius:19px;background:#fff;display:flex;flex-direction:column;transition:.16s ease}.dashboard-card:not(.disabled-card):hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#b8dce8}.disabled-card{opacity:.72}.card-top{display:flex;justify-content:space-between;align-items:start}.icon{min-width:44px;height:44px;padding:0 9px;border-radius:13px;background:var(--brand-soft);color:var(--brand-dark);display:grid;place-items:center;font-weight:900}.youtube .icon{background:#fff0f0;color:#d63232}.facebook .icon{background:#eef4ff;color:#2862bf;font-size:23px}.tag{font-size:9px;font-weight:850;color:#7c8882;background:#f4f6f5;padding:6px 8px;border-radius:99px;text-transform:uppercase}.card-copy{margin-top:22px}.card-copy h3{font-size:18px;margin:0 0 6px}.card-copy p{font-size:12px;line-height:1.55;color:var(--muted);margin:0}.open-link{margin-top:auto;padding-top:20px;display:flex;justify-content:space-between;color:var(--brand-dark);font-size:11px;font-weight:850}footer{padding:25px 0 30px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;color:#7c8882;font-size:11px}
.admin-body{background:#f3f8fb}.admin-shell{width:min(1400px,calc(100% - 36px));margin:0 auto;padding:34px 0 60px}.admin-header{display:flex;justify-content:space-between;gap:24px;align-items:end;margin-bottom:22px}.admin-header h1,.login-panel h1{font-size:36px;margin:7px 0 8px;letter-spacing:-.04em}.admin-header p{margin:0;color:var(--muted);font-size:13px}.admin-actions{display:flex;gap:9px}.admin-panel{background:#fff;border:1px solid var(--line);border-radius:20px;padding:22px;margin-bottom:18px;box-shadow:0 10px 30px rgba(27,73,102,.04)}.admin-section-title{display:flex;justify-content:space-between;gap:20px;align-items:end;margin-bottom:16px}.admin-section-title h2{margin:4px 0 0;font-size:23px}.admin-section-title p{margin:0;color:var(--muted);font-size:12px}.admin-table-wrap{overflow:auto}.admin-table{width:100%;border-collapse:collapse;min-width:900px}.admin-table th{padding:10px;text-align:left;font-size:10px;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;border-bottom:1px solid var(--line)}.admin-table td{padding:8px;border-bottom:1px solid #edf3f6}.admin-table input,.admin-table select,.admin-form input{width:100%;min-height:40px;border:1px solid #cfdee5;border-radius:10px;padding:8px 10px;background:#fff;color:var(--text);font:inherit;font-size:12px}.admin-table input[type=checkbox]{width:18px;min-height:18px}.schedule-table{min-width:1280px}.admin-savebar{position:sticky;bottom:14px;display:flex;justify-content:space-between;align-items:center;gap:20px;background:rgba(18,50,74,.94);color:#fff;padding:12px 14px;border-radius:16px;box-shadow:var(--shadow);font-size:11px}.admin-alert{padding:12px 14px;border-radius:12px;margin:0 0 16px;font-size:13px}.admin-alert.success{background:#e9f8f1;color:#1c744e}.admin-alert.error{background:#fff0f1;color:#96464f}.login-shell{width:min(520px,calc(100% - 28px));min-height:100vh;margin:auto;display:grid;place-items:center}.login-panel{width:100%}.admin-form{display:grid;gap:13px}.admin-form label{display:grid;gap:6px;font-size:12px;font-weight:800}.admin-form .btn{margin-top:4px}
@media(max-width:920px){.hero{grid-template-columns:1fr}.dashboard-grid{grid-template-columns:repeat(2,1fr)}.training-card{grid-template-columns:120px 1fr}.training-link{grid-column:2}.admin-header{align-items:start;flex-direction:column}.admin-section-title{align-items:start;flex-direction:column}}@media(max-width:640px){.page-shell{width:min(100% - 26px,1180px)}.brand-copy{display:none}.hero{padding:50px 0 40px;gap:25px}h1{font-size:42px}.hero-copy>p{font-size:16px}.section-title{align-items:start;flex-direction:column}.zalo-grid,.dashboard-grid{grid-template-columns:1fr}.training-card{grid-template-columns:1fr}.training-date{border-right:0;border-bottom:1px solid var(--line);padding:0 0 12px}.training-link{grid-column:1}footer{flex-direction:column}.admin-shell{width:min(100% - 20px,1400px)}.admin-savebar{align-items:flex-start;flex-direction:column}.admin-actions{flex-wrap:wrap}}