@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@400;500;600;700;800&family=Inter:wght@400;500;600;700;800&display=swap');
:root{--blue:#1768e7;--blue2:#0d58db;--ink:#12203a;--muted:#718096;--line:#e6ebf3;--soft:#f7f9fc;--white:#fff;--radius:16px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font-family:'Be Vietnam Pro','Inter',system-ui,Arial,sans-serif;font-size:14px;-webkit-font-smoothing:antialiased}button,input,textarea{font:inherit}button,a{-webkit-tap-highlight-color:transparent}a{text-decoration:none;color:inherit}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid #b9d6ff;outline-offset:2px}h1,h2,h3,p{margin-top:0}.container{max-width:1210px;padding-left:24px;padding-right:24px;margin-left:auto;margin-right:auto}.student-body{background:#fff}.site-header{height:76px;border-bottom:1px solid #edf0f5;background:#fff;position:sticky;top:0;z-index:10}.nav-wrap{height:100%;display:flex;align-items:center;justify-content:space-between}.brand-link,.admin-logo{display:inline-flex;align-items:center;gap:10px;font-size:16px;letter-spacing:-.5px}.brand-symbol{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;background:#1768e7;border-radius:11px;color:#fff;font-size:25px;line-height:1;transform:none}.nav-links{display:flex;gap:38px;color:#516077;font-weight:600}.nav-links a:hover,.nav-admin:hover{color:var(--blue)}.nav-admin{border:1px solid var(--line);padding:10px 16px;border-radius:11px;font-weight:600;color:#40536d}.nav-admin span{padding-left:8px}.hero{display:grid;grid-template-columns:52% 48%;align-items:center;min-height:502px;padding-top:60px;padding-bottom:74px}.hero-main{position:relative;z-index:1;padding:12px 0}.pill,.cover-tag,.duration-chip{display:inline-flex;align-items:center;font-weight:700;font-size:11px;letter-spacing:.7px;color:var(--blue);background:#e9f1ff;border-radius:100px;padding:9px 13px}.hero h1{max-width:620px;font-size:clamp(34px,4vw,58px);line-height:1.22;letter-spacing:-2px;font-weight:800;margin:23px 0 19px}.hero-desc{max-width:560px;color:#65738b;font-size:16px;line-height:1.95;margin-bottom:29px}.primary-button{border:0;background:var(--blue);color:#fff;display:inline-flex;justify-content:center;align-items:center;gap:27px;padding:15px 21px;border-radius:11px;font-size:13px;font-weight:700;box-shadow:0 10px 22px rgba(23,104,231,.13);transition:background .15s,transform .15s}.primary-button:hover{background:var(--blue2);transform:translateY(-1px)}.primary-button span{font-size:19px}.hero-footnote{margin-top:31px;display:flex;align-items:center;gap:9px;color:#78879c;font-size:11px}.dot-green{display:block;border-radius:50%;width:8px;height:8px;background:#21bf8c}.hero-illustration{height:375px;position:relative;display:flex;justify-content:center;align-items:center}.hero-glow{background:#e9f3ff;position:absolute;inset:20px 8px 0 45px;border-radius:43% 57% 53% 47% / 44% 35% 65% 56%;transform:rotate(-9deg)}.mock-browser{width:420px;max-width:90%;background:white;border-radius:15px;box-shadow:0 25px 65px rgba(23,54,94,.15);position:relative;z-index:2;padding:12px;transform:rotate(-2deg)}.mock-browser-bar{display:flex;align-items:center;gap:5px;height:24px}.mock-browser-bar span,.preview-browser-bar span{width:7px;height:7px;border-radius:50%;background:#d9e1eb}.mock-browser-bar div{margin-left:14px;width:170px;height:9px;border-radius:100px;background:#f3f6fa}.mock-video{height:226px;overflow:hidden;background:linear-gradient(145deg,#3e86e7,#79d1ea);border-radius:10px;position:relative}.mock-sun{position:absolute;right:25%;top:13%;height:75px;width:75px;border-radius:50%;background:#d4f5ff;opacity:.7}.mock-hills{position:absolute;bottom:-65px;left:-20%;width:130%;height:160px;background:#2464af;transform:rotate(-9deg);border-radius:45%}.mock-play,.cover-play{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);display:flex;align-items:center;justify-content:center;border-radius:50%;height:59px;width:59px;color:var(--blue);background:#fff;font-size:21px;padding-left:3px;box-shadow:0 9px 30px rgba(0,0,0,.13)}.mock-bottom{padding:18px 6px 8px}.mock-skeleton{height:8px;background:#e9eef7;border-radius:20px;margin-bottom:9px}.mock-skeleton.big{width:64%}.mock-skeleton.small{width:37%}.mock-bar{height:5px;background:#e8f1fe;border-radius:20px;margin-top:17px}.mock-bar i{display:block;width:37%;height:5px;border-radius:20px;background:var(--blue)}.float-note{position:absolute;bottom:4px;left:0;background:#fff;padding:13px 19px;border-radius:12px;box-shadow:0 11px 42px rgba(24,67,126,.16);z-index:3;display:flex;align-items:center;gap:12px}.float-note>span{background:#e8f6ee;color:#27a26c;border-radius:10px;padding:12px;font-size:19px}.float-note strong{display:block;font-size:11px}.float-note small{display:block;color:#8a98ab;margin-top:5px}.section-courses{padding-bottom:93px}.section-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;margin-bottom:30px}.eyebrow{font-size:10px;font-weight:800;letter-spacing:1.7px;color:var(--blue);display:inline-block}.section-heading h2{font-size:30px;letter-spacing:-1px;margin:10px 0 9px}.section-heading p{color:#8090a2;margin:0;line-height:1.7}.result-count{border:1px solid #e7ecf4;padding:9px 13px;color:#748399;border-radius:40px;white-space:nowrap;font-size:11px}.course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.course-card{border:1px solid var(--line);border-radius:17px;overflow:hidden;background:white;display:block;transition:transform .2s,box-shadow .2s,border-color .2s;min-width:0}.course-card:hover{transform:translateY(-4px);border-color:#c8dbf9;box-shadow:0 16px 28px rgba(29,67,115,.08)}.course-cover{height:196px;position:relative;overflow:hidden;background:linear-gradient(135deg,#123b82,#429bef)}.course-cover.cover-2{background:linear-gradient(135deg,#2b367a,#a07ff2)}.course-cover.cover-3{background:linear-gradient(135deg,#007c91,#4ccbc2)}.course-cover.cover-4{background:linear-gradient(135deg,#143b58,#7ba7b7)}.cover-decor{position:absolute;inset:0}.cover-orbit{position:absolute;width:230px;height:230px;border-radius:50%;border:1px solid #ffffff40;right:-15px;top:-61px;box-shadow:0 0 0 36px #ffffff0d,0 0 0 74px #ffffff09}.cover-play{height:55px;width:55px;font-size:19px;box-shadow:none}.cover-tag{position:absolute;left:15px;bottom:15px;background:#fff;color:#315379;font-size:10px;letter-spacing:0;padding:7px 11px}.course-card-content{padding:24px 21px}.card-kicker{font-size:10px;font-weight:800;letter-spacing:1.35px;color:var(--blue);margin-bottom:12px}.course-card h3{font-size:17px;line-height:1.55;margin:0 0 10px;letter-spacing:-.45px}.course-card p{font-size:12px;line-height:1.95;color:#7e8a9c;margin:0;height:69px;overflow:hidden}.course-card-footer{border-top:1px solid #f0f2f6;margin-top:22px;padding-top:17px;display:flex;justify-content:space-between;gap:10px;font-size:11px;color:#8794a7}.course-card-footer strong{color:var(--blue)}.course-card-footer strong span{font-size:15px;padding-left:4px}.empty-card{border:1px dashed #cbd8e7;padding:38px;border-radius:14px;margin-bottom:16px}.empty-card p{color:var(--muted);margin:0}.how-section{background:#f5f8fc;border-top:1px solid #eef2f6}.how-inner{display:flex;align-items:center;justify-content:space-between;gap:45px;padding-top:65px;padding-bottom:68px}.how-inner h2{font-size:29px;line-height:1.5;letter-spacing:-1px;margin:10px 0 0}.how-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;flex:1;max-width:670px}.how-steps div{background:white;border:1px solid #e9eef6;border-radius:13px;min-height:123px;padding:20px}.how-steps b{font-size:19px;color:var(--blue);display:block;margin-bottom:14px}.how-steps span{font-size:12px;font-weight:600;line-height:1.65}.site-footer{border-top:1px solid #edf0f5;padding:26px 0;color:#7b8a9e;font-size:11px;background:#fff}.footer-flex{display:flex;justify-content:space-between;align-items:center;gap:16px}.footer-flex>span:first-child{color:#243650;font-weight:800}
/* Lesson player */
.learning-main{padding-top:28px;padding-bottom:84px}.breadcrumb{color:#8291a5;display:flex;gap:11px;align-items:center;font-size:11px;margin-bottom:28px}.breadcrumb a:hover{color:var(--blue)}.breadcrumb span:last-child{max-width:80%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.course-head{display:flex;align-items:flex-end;justify-content:space-between;gap:40px;margin-bottom:30px}.course-head h1{font-size:clamp(24px,2.65vw,37px);letter-spacing:-1.3px;line-height:1.32;margin:11px 0 13px}.course-head p{max-width:710px;color:#768499;line-height:1.85;margin-bottom:0;font-size:13px}.course-progress{flex:0 0 225px;min-width:180px}.course-progress-top{display:flex;justify-content:space-between;font-size:11px;font-weight:600;margin-bottom:11px}.course-progress-top strong{color:var(--blue)}.progress-track{background:#eaf0f8;height:7px;border-radius:20px;overflow:hidden}.progress-track>div{height:100%;background:var(--blue);width:0;transition:width .2s;border-radius:20px}.course-progress small{color:#93a0b0;font-size:9px;display:block;margin-top:9px}.learning-layout{display:grid;grid-template-columns:minmax(0,1fr) 343px;gap:24px;align-items:start}.player-frame{background:#0e1729;overflow:hidden;border-radius:14px;aspect-ratio:16/9;position:relative}.lesson-player{display:block;width:100%;height:100%;border:0;background:#081021}.video-empty{height:100%;width:100%;min-height:230px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:35px;background:radial-gradient(circle at 55% 50%,#1b3355 0,#111b2c 65%,#0e1729 100%);color:#f1f6ff}.play-bubble{display:flex;width:68px;height:68px;background:#ffffff15;border:1px solid #ffffff3b;border-radius:50%;justify-content:center;align-items:center;padding-left:5px;font-size:24px;margin-bottom:20px}.video-empty h3{font-size:17px;margin:0 0 10px}.video-empty p{color:#aab9cc;max-width:430px;font-size:11px;line-height:1.85;margin:0}.lesson-details{padding:31px 4px}.lesson-topline{display:flex;align-items:center;justify-content:space-between}.duration-chip{font-size:10px;letter-spacing:0;color:#6c809c;background:#f2f5f9}.lesson-details h2{font-size:24px;letter-spacing:-.8px;margin:13px 0 16px;line-height:1.5}.lesson-description{white-space:normal;font-size:12px;color:#64748b;line-height:2;max-width:780px;min-height:35px}.lesson-actions{display:flex;gap:11px;flex-wrap:wrap;margin-top:25px}.complete-button,.outline-button{border:1px solid #d7e4f6;border-radius:10px;background:#f3f8ff;color:var(--blue);padding:13px 17px;font-size:11px;font-weight:700;display:inline-flex;justify-content:center;align-items:center;gap:10px}.complete-button.completed{background:#e8faf1;color:#159064;border-color:#bdebd2}.complete-check{display:flex;justify-content:center;align-items:center;border:1px solid currentColor;width:18px;height:18px;border-radius:50%;font-size:10px}.outline-button:hover{border-color:#aacdfd}.lesson-sidebar{border:1px solid var(--line);border-radius:15px;overflow:hidden;background:#fff}.sidebar-heading{padding:23px 20px;border-bottom:1px solid #ecf0f6;display:flex;align-items:flex-end;justify-content:space-between}.sidebar-heading h2{font-size:15px;margin:8px 0 0}.sidebar-heading>span{color:#8a98aa;font-size:11px;white-space:nowrap}.lesson-list{padding:9px}.lesson-link{display:flex;align-items:center;gap:13px;padding:16px 12px;border-radius:10px;min-height:72px;border:1px solid transparent}.lesson-link:hover{background:#f8fbff}.lesson-link.active{background:#eff6ff;border-color:#dcebff}.lesson-number{font-size:10px;color:#93a3b7;display:inline-flex;align-items:center;justify-content:center;border:1px solid #e6edf5;min-width:30px;height:30px;border-radius:9px;font-weight:700}.lesson-link.active .lesson-number{color:var(--blue);border-color:#b7d4fc;background:#fff}.lesson-list-title{flex:1;font-size:11px;font-weight:700;line-height:1.7;min-width:0}.lesson-list-title small{display:block;color:#9ca9b9;font-size:10px;font-weight:500;margin-top:4px}.lesson-done{color:#fff;border:1px solid #dce4ed;width:19px;height:19px;border-radius:50%;font-size:11px;display:flex;justify-content:center;align-items:center}.lesson-link.done .lesson-done{color:#fff;background:#20b585;border-color:#20b585}.sidebar-tip{background:#f9fbfe;border-top:1px solid #f0f2f7;display:flex;gap:10px;padding:18px 17px;color:#8a9aac;font-size:10px;line-height:1.8}.sidebar-tip:first-letter{color:var(--blue)}
/* Admin */
.admin-body{background:#f5f7fb;min-height:100vh}.admin-top{height:70px;background:#fff;border-bottom:1px solid #e5eaf1;display:flex;align-items:center;justify-content:space-between;padding:0 24px;position:sticky;top:0;z-index:20}.admin-tag{background:#eaf2ff;color:#1768e7;border-radius:5px;font-size:9px;letter-spacing:.7px;padding:6px 7px;font-weight:800;margin-left:3px}.admin-top-right{display:flex;align-items:center;gap:22px}.view-site{color:#1768e7;font-size:12px;font-weight:700}.logout-button{background:none;border:0;color:#8290a4;font-size:11px;font-weight:700}.logout-button:hover{color:#d44848}.admin-layout{display:grid;grid-template-columns:260px minmax(340px,460px) minmax(380px,1fr);min-height:calc(100vh - 70px)}.admin-left{background:#fff;border-right:1px solid #e5eaf2;padding:27px 12px 30px;max-height:calc(100vh - 70px);overflow-y:auto;position:sticky;top:70px}.admin-nav-label,.admin-nav-head{color:#8899af;font-size:10px;letter-spacing:1.15px;font-weight:800;margin:8px 12px 18px}.admin-nav-item{display:flex;align-items:center;gap:11px;padding:13px 12px;border-radius:10px;color:#576982;font-weight:600;font-size:11px;min-height:43px}.admin-nav-item>span:first-child{font-size:17px;color:#90a0b5;min-width:20px;text-align:center}.admin-nav-item.selected,.admin-nav-item:hover{background:#edf5ff;color:var(--blue)}.admin-nav-item.selected>span:first-child{color:var(--blue)}.admin-nav-head{margin-top:28px;margin-bottom:11px;display:flex;align-items:center;justify-content:space-between}.admin-nav-head button{border:0;width:25px;height:25px;border-radius:7px;color:var(--blue);background:#ecf4ff;font-size:19px;line-height:1}.admin-course{margin-bottom:10px}.nav-text{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1}.draft-dot{height:6px;width:6px;border-radius:50%;background:#f2be58;flex-shrink:0}.admin-lesson{display:flex;align-items:center;gap:9px;color:#8c9aab;font-size:10px;line-height:1.5;padding:10px 13px 10px 43px;border-radius:8px;max-width:100%}.admin-lesson span:last-child{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.admin-lesson span:first-child{font-weight:700;font-size:9px;color:#aab5c4}.admin-lesson.selected,.admin-lesson:hover{color:var(--blue);background:#f3f8ff}.sidebar-add-lesson{padding:3px 0 5px 41px}.sidebar-add-lesson button{border:0;background:transparent;color:var(--blue);font-size:10px;font-weight:700;padding:9px 0}.admin-nav-separator{border-top:1px solid #eff1f6;margin:23px 5px 15px}.admin-help{background:#f6f9fe;border:1px solid #eef2f7;color:#8b9aaf;margin:29px 7px 0;padding:14px;border-radius:10px;font-size:10px;line-height:1.9}.admin-editor{padding:35px 28px 65px;background:#fff;border-right:1px solid #e5eaf2;min-width:0}.editor-header{margin-bottom:28px}.editor-header h1{font-size:23px;letter-spacing:-1px;margin:10px 0 10px}.editor-header p{color:#7c8b9e;font-size:11px;line-height:1.85;margin:0}.edit-form{display:flex;flex-direction:column;gap:22px}.edit-form>label:not(.checkbox-label){display:flex;flex-direction:column;gap:10px;font-size:11px;font-weight:700;color:#33445d}.edit-form input:not([type=checkbox]),.edit-form textarea{width:100%;background:#fff;border:1px solid #e0e6ef;box-shadow:0 1px 2px #0a2a4404;padding:13px 13px;border-radius:9px;color:#273a54;outline:0;font-size:12px;line-height:1.75;transition:border-color .16s,box-shadow .16s}.edit-form textarea{resize:vertical;min-height:90px}.edit-form input:focus,.edit-form textarea:focus{border-color:#8ab7ff;box-shadow:0 0 0 3px #e6f1ff}.required{color:#d85050}.field-help{color:#98a4b5;font-weight:500;font-size:9px;line-height:1.8}.edit-form small{font-size:10px;color:#99a5b5;font-weight:400;line-height:1.75}.checkbox-label{display:flex;gap:13px;align-items:flex-start;background:#f6f9fe;padding:17px;border:1px solid #e9eff8;border-radius:10px}.checkbox-label input{width:17px;height:17px;accent-color:var(--blue)}.checkbox-label strong{display:block;font-size:11px;margin-bottom:7px}.checkbox-label small{display:block}.form-actions{border-top:1px solid #eef1f5;padding-top:22px;margin-top:1px}.primary-button.full{width:100%;justify-content:center}.alert{border-radius:9px;padding:14px 15px;font-size:11px;margin:0 0 21px;line-height:1.7}.alert.error{background:#fff2f1;color:#bf4343;border:1px solid #ffd8d8}.alert.success{background:#edfcf4;color:#1a8f5d;border:1px solid #c2f1d8}.extra-actions{border-top:1px solid #eef1f6;padding-top:23px;display:flex;flex-direction:column;gap:15px;margin-top:27px}.extra-actions form{display:flex;gap:10px;flex-wrap:wrap}.extra-actions button{font-size:10px;padding:10px 13px}.danger-button{background:#fff2f2;color:#bd4a4a;border:1px solid #f9d7d7;border-radius:10px;padding:10px 14px;font-weight:700}.editing-context{font-size:11px;color:#8290a1;margin-bottom:21px;background:#f5f8fc;border-radius:8px;padding:11px 13px}.editing-context a{color:#1768e7;font-weight:700}.admin-preview{padding:27px 28px 34px;min-width:0;position:sticky;top:70px;height:calc(100vh - 70px);overflow-y:auto}.preview-header{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:10px;font-size:11px}.preview-header>div{display:flex;align-items:center;gap:8px}.preview-header a{color:#1768e7;font-size:10px;font-weight:700}.preview-live-dot{width:7px;height:7px;border-radius:50%;background:#36c393;box-shadow:0 0 0 4px #e2f8ee}.preview-caption{font-size:10px;color:#8b9aad;margin-bottom:18px}.preview-window{background:#fff;border:1px solid #dbe4ef;border-radius:13px;box-shadow:0 18px 44px rgba(36,67,109,.09);overflow:hidden}.preview-browser-bar{height:38px;background:#f8fafd;border-bottom:1px solid #e7ebf1;display:flex;align-items:center;padding:0 14px;gap:5px}.preview-browser-bar p{margin:0 auto 0 23px;color:#a3b0c2;font-size:9px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.preview-window iframe{width:100%;height:min(73vh,710px);display:block;border:0;background:#fff}.preview-hint{margin-top:19px;color:#8d9bac;font-size:10px;line-height:2}.auth-shell{min-height:100vh;display:flex;justify-content:center;align-items:center;padding:30px 18px;background:radial-gradient(circle at 75% 12%,#e6f0ff,#f8faff 45%,#f4f7fd 100%)}.auth-card{width:100%;max-width:434px;background:white;padding:40px 39px;border:1px solid #e3eaf6;border-radius:19px;box-shadow:0 25px 65px rgba(41,72,109,.07)}.auth-icon{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;background:var(--blue);color:#fff;font-size:27px;margin-bottom:25px}.auth-card h1{font-size:26px;letter-spacing:-1px;margin:10px 0 11px}.auth-card>p{font-size:11px;color:#8492a6;line-height:2;margin-bottom:27px}.auth-bottom{border-top:1px solid #edf1f6;margin-top:25px;padding-top:20px;text-align:center;color:#7890aa;font-size:11px}.auth-bottom:hover{color:var(--blue)}
@media(max-width:1250px){.admin-layout{grid-template-columns:210px 390px minmax(320px,1fr)}.admin-editor{padding:29px 22px}.admin-preview{padding:25px 19px}.admin-left{padding:22px 9px}.hero-illustration{transform:scale(.93)}}
@media(max-width:1040px){.admin-layout{grid-template-columns:210px minmax(340px,1fr)}.admin-preview{grid-column:2;position:static;height:auto;padding-top:0}.preview-window iframe{height:550px}.learning-layout{grid-template-columns:minmax(0,1fr) 295px;gap:18px}.course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.how-inner{flex-direction:column;align-items:flex-start}.how-steps{width:100%;max-width:none}.hero{min-height:460px}.hero h1{font-size:43px}}
@media(max-width:720px){.container{padding-left:17px;padding-right:17px}.site-header{height:66px}.brand-link{font-size:14px}.brand-symbol{width:31px;height:31px}.nav-links{display:none}.nav-admin{font-size:10px;padding:9px 12px}.hero{display:flex;flex-direction:column;align-items:stretch;padding-top:39px;padding-bottom:38px}.hero h1{font-size:34px;letter-spacing:-1.2px}.hero-desc{font-size:13px;line-height:1.9}.hero-illustration{height:305px;transform:none;margin-top:30px}.mock-browser{width:345px}.mock-video{height:168px}.float-note{bottom:0;left:5px}.section-courses{padding-bottom:60px}.section-heading{align-items:flex-start;flex-direction:column}.section-heading h2{font-size:25px}.course-grid{grid-template-columns:1fr}.course-cover{height:200px}.course-card p{height:auto;max-height:70px}.how-inner{padding-top:47px;padding-bottom:50px}.how-inner h2{font-size:25px}.how-steps{grid-template-columns:1fr;gap:10px}.how-steps div{min-height:70px;display:flex;align-items:center;gap:15px}.how-steps b{margin:0}.footer-flex{flex-direction:column;align-items:flex-start}.learning-main{padding-top:22px}.course-head{flex-direction:column;align-items:stretch;gap:25px}.course-head h1{font-size:26px}.course-progress{flex-basis:auto}.learning-layout{grid-template-columns:1fr}.lesson-sidebar{grid-row:2}.lesson-details h2{font-size:21px}.lesson-actions{flex-direction:column}.lesson-actions>*{width:100%}.admin-top{padding:0 14px;height:61px}.admin-logo{font-size:11px}.admin-tag{font-size:8px}.admin-top-right{gap:9px}.view-site,.logout-button{font-size:10px}.admin-layout{display:block}.admin-left{position:static;max-height:270px;overflow:auto;border-bottom:1px solid #e5eaf2;border-right:0}.admin-editor{padding:24px 18px 38px}.admin-preview{padding:20px 14px 30px}.preview-window iframe{height:580px}.auth-card{padding:29px 24px}.auth-card h1{font-size:22px}}

/* Gmail sign-up / paid-class permission upgrade */
.account-main{min-height:calc(100vh - 90px);display:flex;justify-content:center;align-items:flex-start;padding:68px 18px 110px;background:#f7f9fc}
.account-card{width:min(510px,100%);max-width:510px;margin:0;}
.account-tabs{display:flex;gap:8px;background:#f1f5f9;padding:6px;border-radius:14px;margin:22px 0 24px}
.account-tabs a{flex:1;text-align:center;padding:12px 8px;border-radius:10px;text-decoration:none;font-weight:700;color:#53677d}
.account-tabs a.current{background:white;box-shadow:0 3px 12px #172d4918;color:#174e98}
.notice-subtle{font-size:12px;color:#6f7f93;line-height:1.6;margin-top:16px}
.account-signout{margin-top:19px}
.locked-course{max-width:750px;background:white;margin:38px auto 95px;padding:60px 48px;border:1px solid #e6eefa;border-radius:24px;text-align:center;box-shadow:0 12px 42px #153b7611}
.locked-course h1{font-size:clamp(28px,4vw,46px);line-height:1.2;margin:16px 0}
.locked-course p{color:#5b7089;font-size:16px;line-height:1.8;margin:12px auto 22px;max-width:580px}
.locked-course .outline-button{margin:8px}
.locked-icon{font-size:34px;width:80px;height:80px;background:#edf5ff;display:grid;place-items:center;margin:0 auto 22px;border-radius:20px}
.admin-student-list{display:grid;gap:7px;max-height:270px;overflow:auto;padding:2px 2px 16px;margin-bottom:20px;border-bottom:1px solid #e4eaf3}
.admin-student-row{display:flex;justify-content:space-between;align-items:center;text-decoration:none;color:#273e58;padding:12px;border:1px solid #e5ebf3;border-radius:13px;gap:10px}
.admin-student-row.selected{border-color:#4b8df3;background:#eff6ff}
.admin-student-row span:first-child{display:flex;flex-direction:column;min-width:0;gap:4px}
.admin-student-row b{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.admin-student-row small{color:#76879e;font-size:12px;word-break:break-all}
.student-chip{font-size:12px;color:#4170a8;font-weight:700;white-space:nowrap}
.student-admin-title h2{margin:10px 0 2px;font-size:23px}
.student-admin-title p{color:#697d93;margin:0 0 22px;word-break:break-all}
.access-heading{font-size:15px;margin:18px 0 8px}
.access-row{margin:5px 0}
.student-reset{margin-top:22px;padding-top:22px;border-top:1px solid #e2eaf4}
.student-instructions{padding:0 25px}
.student-tips{padding:30px 12px;color:#5f7188;font-size:14px;line-height:1.7}
.student-tips h3{color:#15334e;font-size:16px;margin:18px 0 4px}
.student-tips p{margin:0}
@media(max-width:600px){.locked-course{padding:40px 20px}.account-main{padding-top:34px}}


/* ================================================
   Theme 2026 — Xanh lá / chữ lớn: hosting test
   Giao diện học viên + quản trị + đăng ký Gmail
   ================================================ */
:root{--blue:#137b4d;--blue2:#0a5137;--ink:#132e25;--muted:#6d8475;--line:#dfebdf;--soft:#f4faf5;--white:#fff;--radius:16px}
body{font-size:18px;color:var(--ink);line-height:1.55}
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible{outline-color:#8ed8ab}
.site-header{height:86px;border-bottom-color:#e6efe7}
.container{max-width:1220px}
.brand-link,.admin-logo{font-size:21px;font-weight:800;letter-spacing:-.65px}
.brand-symbol,.auth-icon{background:#137b4d;width:44px;height:44px;border-radius:13px}
.nav-wrap{gap:18px}
.nav-links{font-size:17px;color:#52665b;gap:28px}
.nav-admin,.nav-register{font-size:16px;border:1px solid #bcdcc9;padding:12px 16px;color:#116e43;border-radius:12px;font-weight:800;white-space:nowrap;background:#fff}
.nav-register{background:#137b4d;color:#fff;border-color:#137b4d}
.nav-register:hover{background:#0a5137}
.hero{min-height:570px;padding-top:75px;padding-bottom:75px;grid-template-columns:52% 48%;gap:0;background:radial-gradient(ellipse at 86% 40%,#e5f7e9 0%,transparent 49%),#fff}
.pill,.cover-tag,.duration-chip{background:#ebf7ed;color:#128049;font-size:14px;padding:10px 15px;letter-spacing:.5px;border:1px solid #d8eddf}
.hero h1{font-size:clamp(44px,4.15vw,62px);line-height:1.17;letter-spacing:-2px;margin:23px 0 22px}
.hero-desc{color:#62766b;font-size:20px;line-height:1.85;max-width:610px;margin-bottom:30px}
.hero-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.primary-button{font-size:18px;line-height:1.4;min-height:52px;padding:16px 23px;background:var(--blue);box-shadow:0 10px 22px #0f864027;border-radius:12px;gap:13px}
.primary-button:hover{background:#095f39}
.primary-button span{font-size:21px}
.outline-button{border-color:#bcdcc9;color:#137b4d;background:#fff;font-size:17px;padding:14px 18px;border-radius:11px}
.hero-footnote{font-size:15px;color:#607b68;margin-top:28px;line-height:1.8}
.dot-green{background:#16985a}
.hero-glow{background:#dff4e5}
.mock-browser{max-width:91%;border:1px solid #dcece0;border-radius:19px;box-shadow:0 28px 70px #0d4a2e20}
.mock-video{background:linear-gradient(128deg,#092c27 10%,#0f704e 57%,#55ae70);height:228px}
.mock-video:before{content:'AI VIDEO EDITING';font-size:13px;letter-spacing:3px;color:#d1f5dc;position:absolute;bottom:20px;left:22px;font-weight:800;z-index:1}
.mock-sun{background:#9edfb4;opacity:.24}
.mock-hills{background:#06543a;opacity:.4}
.mock-bar,.progress-track{background:#e4efe5}
.mock-play{color:var(--blue)}
.float-note{border:1px solid #edf3ed;box-shadow:0 18px 48px #0f452714}
.float-note>span{background:#e9f8eb;color:#159351}
.float-note strong{font-size:16px}.float-note small{font-size:14px}
.section-courses{padding-top:60px;padding-bottom:92px}
.eyebrow{font-size:14px;letter-spacing:1.3px;color:#0a8650}
.section-heading{margin-bottom:30px}
.section-heading h2{font-size:40px;margin:12px 0 14px}
.section-heading p{font-size:18px;color:#667d6c;line-height:1.8}
.result-count{font-size:15px;padding:11px 16px}
.course-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:26px}
.course-card{border-color:#e3ede5;border-radius:18px;box-shadow:0 7px 22px #132a1c08}
.course-card:hover{border-color:#abd6b4;box-shadow:0 18px 48px #0f452714}
.course-cover{height:220px;background:linear-gradient(135deg,#0b4b38,#17955c)}
.course-cover.cover-2{background:linear-gradient(135deg,#133f39,#358b82)}
.course-cover.cover-3{background:linear-gradient(135deg,#185a39,#74ac52)}
.course-cover.cover-4{background:linear-gradient(135deg,#143a32,#75bfa4)}
.cover-tag{background:#fff;color:#0a5137;font-size:13px;padding:8px 12px}
.course-card-content{padding:26px 26px 25px}
.card-kicker{font-size:14px;color:#0a8650}
.course-card h3{font-size:26px;line-height:1.4;min-height:72px}
.course-card p{font-size:18px;line-height:1.75;height:auto;min-height:67px;color:#71877a}
.course-card-footer{font-size:16px;color:#637d6e}
.course-card-footer strong span{font-size:20px}
.how-section{background:#f3faf4;border-color:#e6efe7}
.how-inner{padding-top:68px;padding-bottom:70px}
.how-inner h2{font-size:37px;line-height:1.4}
.how-steps{max-width:740px;gap:15px}
.how-steps div{min-height:140px;border-color:#dfeee2;padding:22px}
.how-steps b{font-size:26px}
.how-steps span{font-size:18px;line-height:1.6}
.site-footer{font-size:15px;padding:30px 0}
/* Lesson details */
.learning-main{padding-top:38px}
.breadcrumb{font-size:16px;color:#769182}
.course-head h1{font-size:clamp(32px,3vw,43px)}
.course-head p{font-size:18px;color:#687f70;line-height:1.8}
.course-progress{flex-basis:230px}
.course-progress-top{font-size:16px}
.course-progress small{font-size:14px}
.progress-track>div{background:#16985a}
.learning-layout{grid-template-columns:minmax(0,1fr) 355px;gap:25px}
.player-frame{border-radius:17px}
.video-empty{background:radial-gradient(circle at 57% 40%,#18533d 0,#10382e 55%,#0b2821 100%)}
.video-empty h3{font-size:24px}
.video-empty p{font-size:16px}
.lesson-details h2{font-size:32px}
.lesson-description{font-size:18px;line-height:1.85}
.lesson-topline,.sidebar-heading .eyebrow{font-size:15px}
.complete-button{font-size:17px}
.sidebar-heading h2{font-size:25px}
.sidebar-heading>span{font-size:15px}
.lesson-link{padding:18px 16px}
.lesson-list-title{font-size:17px;line-height:1.55}
.lesson-list-title small{font-size:15px}
.lesson-number{font-size:15px}
.lesson-link.active{background:#eaf8ee;border-left-color:#137b4d}
/* User access states */
.locked-course{border-color:#e1ece4;box-shadow:0 12px 42px #16402d12}
.locked-icon{background:#e9f7ed}
.locked-course p{color:#617c6c;font-size:18px}
.locked-course h1{font-size:clamp(32px,4vw,45px)}
/* Account */
.account-main,.auth-shell{background:radial-gradient(ellipse at 72% 17%,#def5e6,#f8fcf9 57%,#f5faf5)}
.account-main{min-height:calc(100vh - 86px)}
.account-card,.auth-card{max-width:545px;border-color:#dfece1;box-shadow:0 24px 55px #16402d10;padding:43px 42px}
.auth-card h1{font-size:36px;line-height:1.35;letter-spacing:-.7px}
.auth-card>p{font-size:18px;line-height:1.8;color:#697f71}
.account-tabs{background:#eff7f1}
.account-tabs a{font-size:18px;padding:14px 8px;color:#5e836c}
.account-tabs a.current{color:#0a5137}
.notice-subtle{font-size:16px;color:#6d8475;line-height:1.8}
.auth-bottom{font-size:16px;color:#587966}
/* Admin */
.admin-body{background:#f7fbf8}
.admin-top{height:80px;border-color:#e2eae3;padding:0 22px}
.admin-top .admin-logo{font-size:19px}
.admin-tag{background:#e9f6ed;color:#0b7145;padding:7px 9px;font-size:12px}
.view-site{color:#137b4d;font-size:16px}
.logout-button{font-size:16px;color:#5d7768}
.admin-layout{grid-template-columns:260px minmax(400px,520px) minmax(370px,1fr);min-height:calc(100vh - 80px)}
.admin-left{top:80px;max-height:calc(100vh - 80px);border-color:#e1ece4;padding:27px 15px}
.admin-nav-label,.admin-nav-head{font-size:14px;color:#728b79}
.admin-nav-head button{background:#e9f7ed;color:#137b4d;width:35px;height:35px;font-size:24px}
.admin-nav-item{font-size:17px;min-height:49px;color:#55705e;padding:14px 13px}
.admin-nav-item.selected,.admin-nav-item:hover{background:#e9f6ed;color:#0a5137}
.admin-nav-item>span:first-child{color:#16814e}
.admin-lesson{font-size:15px;padding:11px 12px 11px 42px;line-height:1.6}
.admin-lesson span:first-child{font-size:13px}
.admin-lesson.selected,.admin-lesson:hover{color:#0a7b4b;background:#ecf8ef}
.sidebar-add-lesson button{font-size:15px;color:#137b4d;padding:11px 0}
.admin-help{background:#f2faf4;color:#557060;border-color:#dfeee2;font-size:15px;padding:17px;line-height:1.8}
.admin-editor{padding:36px 30px 70px;border-color:#e3ede5}
.editor-header h1{font-size:37px;line-height:1.27;margin:9px 0 12px}
.editor-header p{font-size:17px;color:#687f70;line-height:1.8}
.edit-form{gap:22px}
.edit-form>label:not(.checkbox-label){font-size:17px;color:#244332;gap:11px}
.edit-form input:not([type=checkbox]),.edit-form textarea{border-color:#d9e7de;border-radius:11px;padding:16px 16px;font-size:18px;color:#244a35;line-height:1.6}
.edit-form input:not([type=checkbox]):focus,.edit-form textarea:focus{border-color:#66c589;box-shadow:0 0 0 3px #dff5e5}
.field-help,.edit-form small{font-size:15px;color:#779182;line-height:1.7}
.checkbox-label{border-color:#dcebe0;background:#f4faf5;padding:17px}
.checkbox-label strong{font-size:17px;color:#214431}
.checkbox-label small{font-size:15px}
.checkbox-label input{width:21px;height:21px}
.alert{font-size:16px;padding:17px}
.editing-context{background:#e9f7ed;color:#567a62;font-size:16px;padding:13px 15px}
.editing-context a{color:#0b7145}
.extra-actions button{font-size:16px;padding:13px 16px}
.danger-button{font-size:16px}
.admin-preview{top:80px;height:calc(100vh - 80px);padding:31px 27px}
.preview-header{font-size:17px}
.preview-header a{font-size:15px;color:#137b4d}
.preview-caption{font-size:15px;color:#7b8e80}
.preview-window{border-color:#dcece0}
.preview-browser-bar{background:#f8fcf9}
.preview-browser-bar p{font-size:12px;color:#829b89}
.preview-hint{font-size:15px;color:#718a79}
/* Enrollments */
.student-admin-title h2{font-size:27px}
.student-admin-title p{font-size:16px}
.admin-student-row{font-size:17px;border-color:#dcebe0;padding:16px}
.admin-student-row.selected{border-color:#8fceaa;background:#edf8f0}
.admin-student-row small{font-size:15px;color:#6d8978}
.student-chip{color:#137b4d;font-size:15px}
.access-heading{font-size:19px}
.student-tips,.student-instructions{color:#5a7866}
.student-tips{font-size:17px}
.student-tips h3{font-size:21px;color:#0c4a30}
.student-tips p{font-size:16px}
/* Smaller screens */
@media(max-width:1290px){.admin-layout{grid-template-columns:238px minmax(360px,1fr) minmax(310px,1fr)}.admin-editor{padding:30px 24px}.admin-left{padding:24px 10px}}
@media(max-width:1080px){.admin-layout{grid-template-columns:238px minmax(0,1fr)}.admin-preview{grid-column:2;position:static;height:auto;padding:20px 24px 34px}.learning-layout{grid-template-columns:minmax(0,1fr) 320px}}
@media(max-width:800px){body{font-size:17px}.site-header{height:auto;min-height:75px}.nav-wrap{padding-top:13px;padding-bottom:13px;flex-wrap:wrap}.brand-link{font-size:17px}.brand-symbol{width:37px;height:37px}.nav-links{display:none}.nav-admin,.nav-register{font-size:14px;padding:11px 13px}.hero{padding-top:48px;padding-bottom:52px}.hero h1{font-size:clamp(41px,6vw,54px)}.hero-desc{font-size:19px}.section-heading h2{font-size:34px}.course-grid{grid-template-columns:1fr}.course-card h3{font-size:25px;min-height:0}.course-card p{font-size:18px}.how-inner h2{font-size:32px}.how-steps span{font-size:17px}.course-head h1{font-size:36px}.learning-layout{grid-template-columns:1fr}.admin-layout{display:block}.admin-left{position:static;max-height:300px;overflow:auto;padding:16px;border-bottom:1px solid #e1ece4}.admin-editor{padding:27px 18px}.admin-preview{padding:24px 18px}.editor-header h1{font-size:32px}.admin-nav-item{font-size:16px}.admin-lesson{font-size:15px}.account-card,.auth-card{padding:30px}.auth-card h1{font-size:33px}}
@media(max-width:500px){body{font-size:17px}.nav-wrap{gap:9px}.brand-link{font-size:15px;flex:1 1 100%}.nav-admin,.nav-register{font-size:13px;padding:10px 12px}.hero{padding-top:38px}.hero h1{font-size:39px;line-height:1.2}.hero-desc{font-size:18px}.hero-actions{flex-direction:column;align-items:stretch}.hero-actions>*{width:100%;justify-content:center}.hero-illustration{height:315px;margin-top:20px}.mock-browser{max-width:96%}.mock-video{height:176px}.section-heading h2{font-size:32px}.course-cover{height:180px}.how-inner h2{font-size:30px}.course-head h1{font-size:33px}.sidebar-heading h2{font-size:23px}.admin-top .admin-logo{font-size:14px}.admin-tag{font-size:10px}.admin-top-right{gap:9px}.view-site,.logout-button{font-size:13px}.editor-header h1{font-size:30px}.auth-card h1{font-size:30px}.account-tabs a{font-size:16px}.locked-course{padding:36px 19px}.edit-form input:not([type=checkbox]),.edit-form textarea{font-size:17px}}