:root{--navy:#0d1b2b;--navy2:#13263a;--ink:#172b40;--muted:#708091;--gold:#d5b779;--gold2:#ebd7a8;--teal:#589b94;--paper:#f5f5f1;--line:#e5e8e5;--white:#fff;--shadow:0 20px 55px rgba(15,31,48,.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:"DM Sans",Arial,sans-serif;font-size:14px;-webkit-font-smoothing:antialiased}.shell{max-width:1600px;margin:auto;background:var(--paper);min-height:100vh}.topbar{height:78px;padding:0 5.25%;display:flex;align-items:center;justify-content:space-between;background:#fff;border-bottom:1px solid #eceeeb;gap:28px;position:relative;z-index:5}.brand{display:flex;align-items:center;gap:11px;text-decoration:none;color:var(--navy);white-space:nowrap}.brand-mark{height:23px;width:22px;display:flex;align-items:end;gap:3px}.brand-mark span{display:block;width:5px;border-radius:3px 3px 1px 1px;background:var(--gold)}.brand-mark span:nth-child(1){height:11px}.brand-mark span:nth-child(2){height:17px}.brand-mark span:nth-child(3){height:23px}.brand-name{font:800 12px Manrope,sans-serif;letter-spacing:.12em}.brand-name em{font-style:normal;color:#9a8357}.topnav{display:flex;align-items:center;gap:34px;height:100%}.topnav a{height:100%;display:flex;align-items:center;position:relative;text-decoration:none;color:#6d7a87;font-size:12px;font-weight:600;transition:color .2s}.topnav a:hover,.topnav a.active{color:var(--navy)}.topnav a.active:after{content:"";position:absolute;bottom:0;left:0;right:0;height:2px;background:var(--gold)}.top-actions{display:flex;align-items:center;gap:18px}.open-badge{font-size:10px;color:#66786e;display:flex;align-items:center;gap:7px;white-space:nowrap}.open-badge i{width:6px;height:6px;background:#63a77e;border-radius:50%;box-shadow:0 0 0 3px #e7f2ea}.language-picker select{border:1px solid #e6e7e2;border-radius:6px;background:#fff;color:var(--navy);font:700 10px "DM Sans",sans-serif;padding:8px 9px;outline-color:var(--gold)}.menu-toggle{display:none;border:0;background:transparent;padding:5px}.hero{height:438px;position:relative;overflow:hidden;background:var(--navy);color:#fff}.hero-image{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center 54%}.hero-shade{position:absolute;inset:0;background:linear-gradient(90deg,rgba(8,20,34,.96) 0%,rgba(9,22,37,.88) 26%,rgba(9,23,38,.52) 52%,rgba(9,22,37,.08) 100%),linear-gradient(0deg,rgba(9,20,32,.32),transparent 45%)}.hero-copy{position:relative;z-index:1;padding:72px 0 0 8.2%;max-width:680px}.eyebrow,.section-kicker{font-size:9px;line-height:1.5;letter-spacing:.2em;font-weight:700;color:#a89467}.eyebrow{display:flex;align-items:center;gap:10px;color:#d8c590}.eyebrow-line{width:22px;height:1px;background:var(--gold)}h1,h2,p{margin-top:0}.hero h1{font:700 clamp(35px,4.4vw,58px)/1.08 Manrope,sans-serif;letter-spacing:-.045em;margin:22px 0 16px;color:#fff}.hero h1 span{color:#dfc78d}.hero-copy p{font-size:14px;line-height:1.8;color:#e1e7e9;max-width:420px;margin-bottom:26px}.button{border:0;text-decoration:none;cursor:pointer;display:inline-flex;align-items:center;justify-content:space-between;gap:30px;border-radius:4px;padding:13px 16px;font:700 11px "DM Sans",sans-serif;transition:transform .2s,background .2s}.button:hover{transform:translateY(-2px)}.button-gold{background:var(--gold2);color:#1c2b36;min-width:195px}.button-gold:hover{background:#f1dfb3}.button-dark{background:var(--navy);color:#fff}.button-dark:hover{background:#1b3955}.hero-caption{position:absolute;z-index:1;bottom:24px;left:8.2%;display:flex;align-items:center;gap:8px;font-size:10px;color:#e2e3dc}.caption-dot{width:5px;height:5px;border-radius:50%;background:var(--gold)}.hero-index{position:absolute;right:5.2%;bottom:23px;color:#fff;font:700 10px Manrope,sans-serif;letter-spacing:.1em}.hero-index span{color:var(--gold);margin:0 7px}.welcome-row{padding:42px 8.2% 28px;display:flex;align-items:flex-end;justify-content:space-between;gap:35px}.section-kicker{display:block;color:#9b8459;margin-bottom:9px}.welcome-row h2,.sources h2{font:700 23px Manrope,sans-serif;letter-spacing:-.03em;color:var(--navy);margin:0 0 8px}.section-desc{color:#788594;font-size:12px;margin:0;line-height:1.7;max-width:570px}.progress-panel{width:250px;flex:none}.progress-meta,.progress-foot{display:flex;justify-content:space-between;align-items:center}.progress-meta{font-size:10px;color:#758391;margin-bottom:9px}.progress-meta strong{font:700 14px Manrope,sans-serif;color:var(--navy)}.progress-meta small{font-size:10px;color:#98a0a7;font-weight:500}.progress-track{height:5px;background:#e4e6e3;border-radius:9px;overflow:hidden}.progress-track span{display:block;width:0;height:100%;background:linear-gradient(90deg,#78aaa0,var(--gold));border-radius:9px;transition:width .4s}.progress-foot{font-size:9px;color:#98a2a7;margin-top:8px}.progress-foot>span{display:flex;align-items:center;gap:6px}.tiny-spark{width:5px;height:5px;background:#73a982;border-radius:50%}.text-button{border:0;background:transparent;color:#8d969e;font:600 9px "DM Sans",sans-serif;text-decoration:underline;cursor:pointer}.learning-grid{display:grid;grid-template-columns:220px minmax(0,1fr);gap:0;margin:0 5.2% 0;background:#fff;border:1px solid #e9ebe8;border-radius:9px;box-shadow:var(--shadow);overflow:hidden;min-height:530px}.side-rail{padding:25px 17px 19px;background:#fbfbf9;border-right:1px solid #eceeeb;display:flex;flex-direction:column}.rail-title{font:700 9px Manrope,sans-serif;letter-spacing:.15em;color:#a2a9aa;margin:0 8px 13px}.rail-link,.topic-link{border:0;background:transparent;width:100%;display:flex;align-items:center;text-align:left;cursor:pointer;color:#697888;font:600 11px "DM Sans",sans-serif;border-radius:5px;transition:.18s}.rail-link{height:40px;padding:0 9px;gap:10px;margin:2px 0}.rail-link:hover,.rail-link.selected{background:#f0f1ed;color:var(--navy)}.rail-link.selected{box-shadow:inset 2px 0 var(--gold)}.rail-icon{font:700 9px Manrope,sans-serif;color:#a98c55;width:22px}.rail-arrow{margin-left:auto;color:#a98c55}.rail-rule{height:1px;background:#e8eae6;margin:19px 8px 20px}.topic-link{height:35px;padding:0 9px;gap:9px;margin:1px 0}.topic-link:hover,.topic-link.active{color:var(--navy);background:#f3f4f1}.topic-dot{width:7px;height:7px;border-radius:50%;background:#9aa5af}.dot-blue{background:#658aaa}.dot-teal{background:#5c9d91}.dot-gold{background:#c8a45d}.dot-rose{background:#b67b72}.all-dot{background:#9ca8ac}.topic-count{margin-left:auto;font-size:9px;color:#a0a8ab}.rail-tip{margin-top:auto;padding:14px 11px 9px;background:#f2f0e9;border-radius:5px;color:#778080}.tip-star{font-size:13px;color:#ad925d}.rail-tip p{margin:6px 0 0;font:500 10px/1.6 Manrope,sans-serif;color:#707a79}.lesson-area{padding:25px 29px 28px;min-width:0}.lesson-topline{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:35px;margin-bottom:17px}.lesson-topline>div:first-child{font-size:10px;color:#778492}.lesson-label{font:700 9px Manrope,sans-serif;letter-spacing:.16em;color:#ab925c}.lesson-divider{color:#ccd0d0;margin:0 10px}.lesson-tools{display:flex;align-items:center;gap:15px}.search-box{display:flex;align-items:center;gap:6px;border-bottom:1px solid #e3e5e1;padding:4px 2px;color:#a3aaad}.search-box>span{font-size:17px;line-height:1}.search-box input{border:0;background:transparent;width:130px;outline:0;font:500 10px "DM Sans",sans-serif;color:var(--ink)}.search-box input::placeholder{color:#a5acb1}.lesson-time{white-space:nowrap;font-size:9px;color:#89959d}.card-stage{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(200px,.8fr);gap:18px;min-height:260px}.study-card{border:1px solid #e7e9e5;border-radius:7px;min-height:259px;padding:23px 24px 20px;position:relative;background:linear-gradient(135deg,#fff 0%,#fcfcf9 100%);display:flex;flex-direction:column;justify-content:space-between;cursor:pointer;transition:transform .25s,border-color .2s}.study-card:hover{transform:translateY(-2px);border-color:#d9c89d}.card-meta{display:flex;justify-content:space-between;align-items:center;font-size:9px;color:#9aa3a7}.card-tag{font:700 8px Manrope,sans-serif;letter-spacing:.12em;text-transform:uppercase;background:#edf3f2;color:#56867f;border-radius:3px;padding:6px 8px}.card-index{font:700 10px Manrope,sans-serif;color:#a7afb3}.card-term{margin:14px 0 6px;font:700 clamp(27px,3vw,39px)/1.1 Manrope,sans-serif;letter-spacing:-.04em;color:var(--navy)}.card-phonetic{font-size:11px;color:#9ba2a5}.card-bottom{display:flex;align-items:center;justify-content:space-between;margin-top:17px}.card-hint{color:#98a2a5;font-size:9px}.sound-button{background:#f3f3ef;border:1px solid #ecece7;border-radius:50%;width:34px;height:34px;color:#8f784a;font-size:14px;cursor:pointer}.sound-button:hover{background:#f2e8d2}.card-translation{font:600 20px Manrope,sans-serif;color:#4b8b83;margin-top:13px}.card-example{font-size:11px;line-height:1.7;color:#788594;margin-top:10px}.card-example b{color:#384a5b}.card-extra{padding:20px 18px;background:var(--navy);border-radius:7px;color:#fff;position:relative;overflow:hidden;display:flex;flex-direction:column;justify-content:space-between}.card-extra:after{content:"";position:absolute;width:145px;height:145px;border:1px solid rgba(213,183,121,.25);border-radius:50%;right:-70px;top:-67px;box-shadow:0 0 0 20px rgba(213,183,121,.04),0 0 0 42px rgba(213,183,121,.03)}.extra-label{font:700 8px Manrope,sans-serif;letter-spacing:.16em;color:#c6ad78}.extra-title{font:600 15px/1.45 Manrope,sans-serif;max-width:185px;color:#f5f2e9;margin:12px 0 5px}.extra-copy{font-size:10px;line-height:1.65;color:#c0cad1;margin:0;max-width:210px}.extra-stat{display:flex;align-items:center;gap:9px;color:#d9c894;font-size:9px}.extra-stat b{font:700 18px Manrope,sans-serif}.card-controls{display:flex;align-items:center;justify-content:space-between;margin-top:17px}.control-group{display:flex;gap:7px}.control-button{border:1px solid #e3e6e4;background:#fff;border-radius:4px;color:#61717e;font:600 10px "DM Sans",sans-serif;padding:9px 12px;cursor:pointer}.control-button:hover{border-color:#c9b57e;color:var(--navy)}.control-button.primary{background:var(--navy);border-color:var(--navy);color:#fff}.control-button.primary:hover{background:#1b3955}.dots{display:flex;gap:5px}.dots i{width:5px;height:5px;border-radius:50%;background:#d8dddc}.dots i.on{background:var(--gold)}.mode-head{display:flex;justify-content:space-between;align-items:flex-start;margin:4px 0 20px}.mode-head h3{font:700 21px Manrope,sans-serif;margin:0 0 5px;letter-spacing:-.03em;color:var(--navy)}.mode-head p{font-size:11px;color:#85919b;margin:0}.mode-pill{font:700 8px Manrope,sans-serif;letter-spacing:.12em;text-transform:uppercase;color:#857149;background:#f4efe1;border-radius:20px;padding:7px 10px}.quiz-question{padding:23px 25px;border:1px solid #e7e9e5;border-radius:7px;background:#fbfbf9;margin-bottom:13px}.question-count{color:#a38d5e;font:700 9px Manrope,sans-serif;letter-spacing:.13em}.quiz-question h3{font:700 19px/1.4 Manrope,sans-serif;color:var(--navy);margin:12px 0 5px}.question-translation{font-size:10px;color:#89949a}.answer-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.answer-option{border:1px solid #e7e9e5;border-radius:5px;background:#fff;text-align:left;padding:12px 14px;color:#31465a;font:600 11px "DM Sans",sans-serif;cursor:pointer;transition:.18s}.answer-option:hover:not(:disabled){border-color:#c7b27a;background:#fdfbf6}.answer-option.correct{border-color:#6fa18b;background:#edf6f0;color:#346f55}.answer-option.incorrect{border-color:#ce8c81;background:#fbf0ee;color:#9c4e43}.feedback{min-height:22px;margin:11px 0 0;color:#61746c;font-size:10px}.quiz-footer{display:flex;justify-content:space-between;align-items:center;margin-top:13px}.quiz-score{font-size:10px;color:#85909a}.quiz-score strong{color:var(--navy)}.match-board{display:grid;grid-template-columns:1fr 1fr;gap:10px}.match-column{display:grid;gap:7px}.match-card{min-height:47px;text-align:left;border:1px solid #e6e9e5;border-radius:5px;background:#fff;padding:9px 12px;font:600 11px/1.4 "DM Sans",sans-serif;color:#374b5d;cursor:pointer;transition:.18s}.match-card:hover{border-color:#ccb681}.match-card.selected{border-color:#b69b63;background:#f5f0e4}.match-card.matched{opacity:.55;border-color:#7fa791;background:#eef5f0;cursor:default}.match-card.wrong{border-color:#cd8c80;background:#fbefed}.match-status{font-size:10px;min-height:20px;color:#7b8992;margin:12px 0}.match-progress{font-size:9px;color:#89959c}.empty-state{border:1px dashed #d9dedb;border-radius:6px;text-align:center;padding:40px 20px;color:#78858e;font-size:12px}.empty-state b{display:block;font:700 18px Manrope,sans-serif;color:var(--navy);margin-bottom:7px}.case-strip{margin:48px 5.2% 0;background:#e8e7df;border-radius:7px;padding:25px 4%;display:grid;grid-template-columns:74px minmax(250px,1fr) auto;align-items:center;gap:25px}.case-mark{height:66px;width:66px;border:1px solid #cdb77f;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-direction:column;color:#8f7c55;font:700 8px Manrope,sans-serif;letter-spacing:.14em}.case-mark b{font:700 17px Manrope,sans-serif;margin-top:1px;color:#455769}.case-copy .section-kicker{margin-bottom:5px}.case-copy h2{font:700 17px Manrope,sans-serif;margin:0 0 6px;color:var(--navy)}.case-copy p{font-size:11px;color:#71808b;margin:0;line-height:1.65;max-width:570px}.case-action{display:flex;align-items:center;gap:12px}.case-answer{font:700 12px Manrope,sans-serif;color:#438170;min-width:0}.case-answer.show{min-width:96px}.case-action .button{white-space:nowrap}.phrase-band{padding:60px 8.2%;display:grid;grid-template-columns:.75fr 1.25fr;gap:65px;align-items:center}.phrase-left h2{font:700 28px/1.2 Manrope,sans-serif;letter-spacing:-.04em;color:var(--navy);margin:0 0 11px}.phrase-left p{font-size:11px;line-height:1.7;color:#82909b;max-width:260px}.phrase-list{border-top:1px solid #dfe3df}.phrase-row{display:grid;grid-template-columns:40px minmax(150px,1fr) auto;align-items:center;gap:11px;padding:13px 4px;border-bottom:1px solid #dfe3df}.phrase-num{font:700 9px Manrope,sans-serif;color:#b4a276}.phrase-text{font:600 12px Manrope,sans-serif;color:#304459}.phrase-translation{font-size:10px;color:#87939b;margin-top:4px}.phrase-listen{border:1px solid #e0e4df;background:#fff;color:#8b764b;border-radius:50%;width:30px;height:30px;cursor:pointer}.phrase-listen:hover{background:#f5eedf}.sources{padding:35px 8.2% 36px;background:#fff;border-top:1px solid #e8ebe7}.sources-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:35px;margin-bottom:21px}.sources h2{font-size:20px}.source-note{max-width:380px;margin:0;color:#87929a;font-size:10px;line-height:1.6}.source-links{display:grid;grid-template-columns:1fr 1fr;gap:0 30px}.source-links a{display:flex;align-items:center;gap:8px;text-decoration:none;color:#647481;font-size:10px;padding:11px 2px;border-top:1px solid #eceeea}.source-links a:first-child,.source-links a:nth-child(2){border-top:1px solid #dfe3df}.source-links a:hover{color:#9b8050}.source-links a span:first-of-type{flex:1}.source-links a span:last-child{color:#ab9360}.disclaimer{font-size:9px;color:#a0a7a8;margin:18px 0 0}.footer{min-height:75px;padding:17px 5.2%;display:flex;justify-content:space-between;align-items:center;gap:18px;color:#8f9aa2;background:var(--navy);font-size:9px}.footer-brand .brand-name{color:#e6e9e5}.footer-brand .brand-name em{color:var(--gold)}.back-top{color:#d4c08d;text-decoration:none}.toast{position:fixed;bottom:25px;left:50%;transform:translate(-50%,15px);padding:11px 16px;border-radius:5px;background:#12283d;color:#fff;font-size:11px;box-shadow:0 8px 30px rgba(0,0,0,.18);opacity:0;pointer-events:none;transition:.25s;z-index:20}.toast.show{opacity:1;transform:translate(-50%,0)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:1080px){.topbar{padding:0 4%}.topnav{gap:21px}.open-badge{display:none}.learning-grid{margin-inline:4%;grid-template-columns:195px minmax(0,1fr)}.lesson-area{padding-inline:22px}.welcome-row{padding-inline:6%}.hero-copy{padding-left:6%}.hero-caption{left:6%}.phrase-band,.sources{padding-inline:6%}.case-strip{margin-inline:4%}}
@media(max-width:760px){.topbar{height:64px;padding:0 20px}.topnav{display:none;position:absolute;top:63px;left:0;right:0;height:auto;background:#fff;border-bottom:1px solid var(--line);padding:8px 20px 14px;flex-direction:column;align-items:stretch;gap:0}.topnav.open{display:flex}.topnav a{height:40px}.topnav a.active:after{display:none}.top-actions{margin-left:auto}.menu-toggle{display:flex;flex-direction:column;gap:5px;border-left:1px solid #e9eae7;padding:6px 0 6px 16px}.menu-toggle span{width:18px;height:1px;background:var(--navy)}.hero{height:415px}.hero-image{object-position:60% center}.hero-shade{background:linear-gradient(90deg,rgba(8,20,34,.96),rgba(9,22,37,.76) 55%,rgba(9,22,37,.19)),linear-gradient(0deg,rgba(9,20,32,.3),transparent)}.hero-copy{padding:62px 24px 0;max-width:500px}.hero h1{font-size:clamp(36px,9vw,50px)}.hero-copy p{max-width:340px}.hero-caption{left:24px}.hero-index{right:22px}.welcome-row{padding:34px 22px 20px;align-items:flex-start;flex-direction:column;gap:18px}.progress-panel{width:100%}.learning-grid{display:block;margin:0 14px;border-radius:7px;overflow:visible}.side-rail{border:0;border-bottom:1px solid #eceeeb;padding:12px 13px;display:flex;flex-direction:row;align-items:center;overflow-x:auto;gap:5px}.side-rail>.rail-title,.side-rail>.rail-rule,.side-rail>.topic-link,.side-rail>.rail-tip{display:none}.rail-link{width:auto;min-width:max-content;height:36px;padding:0 10px;margin:0;gap:7px}.rail-link .rail-icon{width:auto}.rail-link.selected{box-shadow:inset 0 -2px var(--gold)}.rail-arrow{display:none}.lesson-area{padding:20px 15px 23px}.lesson-topline{align-items:flex-start;flex-direction:column;margin-bottom:13px;gap:11px}.lesson-tools{width:100%;justify-content:space-between}.search-box{flex:1}.search-box input{width:100%}.card-stage{grid-template-columns:1fr;min-height:0;gap:9px}.study-card{min-height:239px;padding:19px}.card-extra{min-height:112px;padding:16px 17px}.extra-title{max-width:80%;font-size:13px;margin-top:7px}.extra-copy{display:none}.extra-stat{position:absolute;right:17px;bottom:16px}.card-controls{margin-top:12px}.case-strip{margin:28px 14px 0;padding:19px;grid-template-columns:51px 1fr;gap:12px;align-items:start}.case-mark{height:48px;width:48px}.case-mark b{font-size:13px}.case-copy h2{font-size:16px}.case-copy p{font-size:10px}.case-action{grid-column:1 / -1;justify-content:flex-end;min-height:39px}.case-action .button{margin-left:auto}.phrase-band{padding:42px 22px;grid-template-columns:1fr;gap:12px}.phrase-left h2{font-size:25px}.phrase-left h2 br{display:none}.phrase-left p{max-width:unset;margin-bottom:12px}.phrase-row{grid-template-columns:26px 1fr 30px}.phrase-text{font-size:11px}.sources{padding:30px 22px}.sources-heading{display:block}.source-note{margin-top:10px}.source-links{grid-template-columns:1fr}.source-links a:nth-child(2){border-top:0}.footer{padding:17px 20px;flex-wrap:wrap}.footer>span{order:3;width:100%;line-height:1.6}.match-board{gap:6px}.match-card{padding:8px;font-size:10px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}

/* Keep each study item in the requested English → Chinese → Vietnamese order. */
.translation-line{display:flex;align-items:baseline;gap:8px;margin-top:7px;font:600 12px/1.45 "DM Sans",sans-serif;color:#4b8b83}
.translation-label{flex:0 0 76px;font:700 8px Manrope,sans-serif;letter-spacing:.08em;color:#a58d59}
.card-phonetic{display:grid;gap:2px}
.card-extra .translation-line{color:#f2f5f3;font-size:11px}
.card-extra .translation-label{color:#d5bb7a}
.card-extra .extra-title{font-size:13px;line-height:1.5}
.card-example .example-zh,.card-example .example-vi{display:block;margin-top:2px}
.phrase-translation{display:flex;flex-direction:column;gap:3px}
.match-card{min-height:54px}
.match-card small{display:block;margin-top:3px;font:400 10px/1.4 "DM Sans",sans-serif;color:#87939b}
.quiz-vietnamese{display:block;margin-top:3px;font:500 13px/1.5 "DM Sans",sans-serif;color:#76848f}