@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Noto+Sans+JP:wght@400;500;600;700;800&display=swap');
:root{--navy:#17345c;--navy2:#214776;--ink:#1c2d43;--muted:#77859a;--line:#e4eaf1;--bg:#f5f7fb;--white:#fff;--blue:#3675d6;--shadow:0 12px 34px rgba(23,52,92,.07)}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:'DM Sans','Noto Sans JP',sans-serif;font-size:14px}button,input,select,textarea{font:inherit}button{cursor:pointer}.app-shell{min-height:100vh}.sidebar{width:248px;position:fixed;inset:0 auto 0 0;background:#fff;border-right:1px solid var(--line);padding:25px 17px;display:flex;flex-direction:column;z-index:5}.brand{display:flex;align-items:center;gap:11px;padding:0 7px 27px}.brand-mark{height:42px;width:42px;border-radius:13px;background:var(--navy);color:white;display:grid;place-items:center;font-family:'Noto Sans JP';font-size:24px;font-weight:700}.brand strong{display:block;font-size:15px;letter-spacing:-.3px}.brand small{display:block;color:var(--muted);font-size:11px;margin-top:3px}.user-panel{display:flex;align-items:center;gap:10px;padding:14px 9px;background:#f6f8fc;border:1px solid #edf0f6;border-radius:13px;margin-bottom:23px}.avatar{width:34px;height:34px;border-radius:50%;background:#dce9ff;color:#2c5b9d;display:grid;place-items:center;font-size:18px}.user-panel strong{display:block;font-size:12px;max-width:155px;overflow:hidden;text-overflow:ellipsis}.user-panel small{display:block;color:var(--muted);font-size:10px;margin-top:3px}.nav{display:grid;gap:6px}.nav-item{border:0;background:transparent;border-radius:10px;text-align:left;padding:12px 13px;color:#64738a;display:flex;align-items:center;gap:13px;font-weight:600;font-size:13px}.nav-item span{font-family:'Noto Sans JP';font-size:17px;width:20px;text-align:center}.nav-item:hover{background:#f5f8fd}.nav-item.active{background:#eaf1ff;color:#285fa9}.sidebar-bottom{margin-top:auto}.side-note{padding:15px;border-radius:13px;background:#f7f8fb;margin-bottom:13px}.side-note strong{font-size:12px}.side-note p{font-size:11px;line-height:1.6;color:var(--muted);margin:7px 0 0}.main{margin-left:248px;padding:0 34px;max-width:1700px}.topbar{height:105px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);margin-bottom:26px}.eyebrow{font-size:9px;font-weight:700;letter-spacing:1.7px;color:#8290a4}.topbar h1{font-size:25px;letter-spacing:-.8px;margin:5px 0 0}.top-actions{display:flex;align-items:center;gap:13px}.today{font-size:12px;color:var(--muted)}.icon-button{border:1px solid var(--line);background:#fff;border-radius:10px;width:38px;height:38px;font-size:18px;display:none}.page{display:none;animation:fade .2s ease}.page.active{display:block}@keyframes fade{from{opacity:.5;transform:translateY(3px)}to{opacity:1;transform:none}}.hero{min-height:252px;border-radius:20px;background:linear-gradient(115deg,#17345c,#28558c);color:white;padding:31px 37px;display:flex;align-items:center;position:relative;overflow:hidden}.hero-copy{position:relative;z-index:1;max-width:58%}.hero-tag{font-size:9px;letter-spacing:1.8px;font-weight:700;color:#b7d3ff}.hero h2{font-size:29px;line-height:1.3;letter-spacing:-.7px;margin:12px 0}.hero h2 em{font-family:'Noto Sans JP';font-style:normal;font-size:22px;color:#c6ddff}.hero p{color:#d2deee;font-size:12px;line-height:1.8;max-width:430px;margin:0 0 20px}.hero-art{position:absolute;right:2%;top:0;bottom:0;width:42%;display:flex;align-items:center;justify-content:center;overflow:hidden}.sun{position:absolute;width:185px;height:185px;border-radius:50%;background:#eabf85;opacity:.95;right:20%;top:22px}.hero-kanji{position:relative;font-family:'Noto Sans JP';font-size:54px;font-weight:800;color:#fff;letter-spacing:7px;text-shadow:0 5px 22px #18345d66;z-index:1}.kanji-orbit{position:absolute;display:grid;place-items:center;border:1px solid #ffffff75;border-radius:50%;color:#fff;background:#ffffff12;font-family:'Noto Sans JP';z-index:2}.orbit-one{height:55px;width:55px;right:13%;top:25px;font-size:25px}.orbit-two{height:43px;width:43px;left:4%;bottom:43px;font-size:20px}.hero-caption{position:absolute;bottom:20px;right:11%;font-size:8px;letter-spacing:2px;color:#c4d8f3}.btn{border:0;border-radius:9px;padding:11px 15px;font-weight:700;font-size:12px;display:inline-flex;align-items:center;justify-content:center;gap:9px;transition:.15s}.btn:hover{transform:translateY(-1px)}.btn-primary{background:var(--blue);color:#fff}.btn-light{background:#fff;color:var(--navy)}.btn-outline{background:#fff;border:1px solid #d9e1ed;color:#50617a}.btn-ghost{background:transparent;color:#6d7c91}.full{width:100%}.section-heading{display:flex;align-items:center;justify-content:space-between;margin:29px 0 14px;gap:15px}.section-heading h2{font-size:17px;margin:0;letter-spacing:-.4px}.section-heading p{color:var(--muted);font-size:11px;margin:6px 0 0}.text-button{background:transparent;border:0;color:#356fc5;font-size:11px;font-weight:700;padding:8px}.category-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:13px}.category-card{position:relative;text-align:left;border:1px solid var(--line);border-radius:14px;background:white;padding:17px;min-height:151px;display:flex;flex-direction:column;align-items:flex-start;transition:.2s}.category-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}.cat-icon{height:38px;width:38px;display:grid;place-items:center;border-radius:11px;font-family:'Noto Sans JP';font-size:21px;font-weight:700;margin-bottom:13px}.cat-title{font-size:13px;font-weight:700}.cat-sub{font-size:10px;color:var(--muted);margin-top:6px;line-height:1.5}.cat-arrow{position:absolute;right:14px;top:15px;color:#9aa6b6}.blue .cat-icon{background:#e6efff;color:#356dc0}.green .cat-icon{background:#e3f5ed;color:#2b8a62}.orange .cat-icon{background:#fff0de;color:#bd772a}.purple .cat-icon{background:#f0e8ff;color:#8054bd}.stats-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:13px}.stat-card{background:#fff;border:1px solid var(--line);border-radius:13px;padding:18px}.stat-label{display:block;color:#77859a;font-size:11px}.stat-card strong{display:block;font-size:27px;letter-spacing:-1px;margin:10px 0 5px}.stat-foot{font-size:10px;color:#9aa5b5}.quick-list,.knowledge-list{display:grid;gap:9px}.quick-row,.knowledge-row{background:#fff;border:1px solid var(--line);border-radius:12px;padding:13px 16px;display:flex;align-items:center;gap:14px}.item-symbol{width:43px;height:43px;border-radius:10px;background:#f0f4fb;display:grid;place-items:center;font-family:'Noto Sans JP';font-size:19px;font-weight:700;flex-shrink:0}.item-content{flex:1;min-width:0}.item-title{font-family:'Noto Sans JP';font-weight:700;font-size:16px}.item-reading{font-size:10px;color:#8793a5;margin-top:3px}.item-meaning{font-size:12px;color:#4e5f75;margin-top:5px}.item-meta{display:flex;gap:6px;flex-wrap:wrap;margin-top:7px}.pill{font-size:9px;padding:4px 7px;border-radius:5px;background:#eef3fb;color:#54709b;font-weight:700}.row-actions{display:flex;gap:6px}.mini-btn{border:1px solid var(--line);background:#fff;border-radius:7px;padding:7px 9px;color:#5b6b80;font-size:11px}.toolbar{display:flex;gap:10px;margin-bottom:22px}.search-wrap{flex:1;display:flex;align-items:center;gap:9px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:0 12px;color:#7b8ba0}.search-wrap input{border:0;outline:0;min-width:0;width:100%;height:42px;background:transparent;font-size:12px}.toolbar select,.study-filters select{background:#fff;border:1px solid var(--line);border-radius:9px;padding:0 11px;color:#52647a;font-size:11px;min-width:130px}.compact{margin-top:0}.empty-state{text-align:center;padding:55px 20px;background:#fff;border:1px dashed #dce4ee;border-radius:15px}.empty-state div{font-size:30px;color:#819bc1}.empty-state h3{margin:12px 0 5px}.empty-state p{color:var(--muted);font-size:12px}.hidden{display:none!important}.study-layout{display:grid;grid-template-columns:minmax(0,1fr) 245px;gap:20px}.study-main{min-width:0}.study-toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px}.study-toolbar h2{font-size:21px;margin:7px 0 4px}.study-toolbar p{font-size:11px;color:var(--muted);margin:0}.study-filters{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:9px;margin:22px 0}.study-filters label,.form-grid label,.modal form label{display:grid;gap:7px;font-size:10px;color:#6c7b90;font-weight:700}.study-filters select{height:37px;min-width:0;width:100%}.flashcard-wrap{min-height:360px;border-radius:17px;border:1px solid var(--line);background:#fff;display:flex;align-items:center;justify-content:center;padding:24px;box-shadow:0 6px 24px #17345c08}.flashcard{width:100%;max-width:560px;text-align:center}.card-counter{font-size:10px;color:#91a0b2;letter-spacing:1px}.flash-term{font-family:'Noto Sans JP';font-size:38px;line-height:1.5;font-weight:700;margin:22px 0 8px;overflow-wrap:anywhere}.flash-reading{color:#7b8ba0;font-size:13px}.flash-divider{height:1px;background:var(--line);max-width:280px;margin:23px auto}.flash-meaning{font-size:20px;font-weight:700;margin:10px 0}.flash-example{font-family:'Noto Sans JP';font-size:13px;line-height:1.8;margin-top:16px}.flash-note{font-size:11px;color:var(--muted);margin-top:7px;line-height:1.7}.flash-actions{display:flex;justify-content:center;gap:8px;flex-wrap:wrap;margin-top:25px}.answer-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;max-width:500px;margin:22px auto}.answer-option{background:#fff;border:1px solid #dfe6f0;border-radius:10px;padding:13px 9px;color:#44556d;font-size:12px}.answer-option:hover{border-color:#7aa4e8;background:#f5f8ff}.answer-option.correct{background:#e7f7ed;border-color:#79c89a;color:#217448}.answer-option.wrong{background:#fff0f0;border-color:#e7a1a1;color:#a33}.study-aside{display:grid;align-content:start;gap:13px}.aside-card{border:1px solid var(--line);background:#fff;border-radius:14px;padding:19px}.aside-icon{font-size:24px}.aside-card h3{font-size:13px;margin:13px 0 7px}.aside-card p,.aside-card li{font-size:11px;line-height:1.8;color:var(--muted)}.mini-progress{height:6px;border-radius:8px;background:#edf1f7;overflow:hidden;margin:16px 0 7px}.mini-progress span{display:block;height:100%;width:0;background:#4b86df;border-radius:8px;transition:.2s}.aside-card small{font-size:10px;color:#8c9aad}.tips ul{padding-left:17px;margin-bottom:0}.panel{background:#fff;border:1px solid var(--line);border-radius:15px;padding:22px}.manage-grid{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(270px,.7fr);gap:16px}.panel-heading{display:flex;align-items:center;gap:11px;margin-bottom:22px}.panel-icon{height:38px;width:38px;border-radius:11px;background:#e8f0ff;color:#3974c8;display:grid;place-items:center;font-size:21px}.panel-icon.violet{background:#f0e8ff;color:#8054bd}.panel-icon.green-icon{background:#e3f5ed;color:#2b8a62}.panel-heading h3,.panel h3{font-size:14px;margin:0}.panel-heading p{font-size:10px;color:var(--muted);margin:5px 0 0}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.form-grid input,.form-grid select,.form-grid textarea,.modal form input{width:100%;border:1px solid #dfe6ef;border-radius:8px;padding:11px;color:#30435b;outline:0;background:#fff;font-size:12px}.form-grid input:focus,.form-grid textarea:focus,.form-grid select:focus,.modal form input:focus{border-color:#6e9de4;box-shadow:0 0 0 3px #3675d615}.form-grid textarea{resize:vertical}.span-2{grid-column:span 2}.form-actions{display:flex;gap:8px;margin-top:20px;flex-wrap:wrap}.form-message{font-size:11px;color:#2d865b;min-height:15px}.import-box{border:1px dashed #cbd7e7;background:#fafcff;border-radius:12px;padding:22px;text-align:center}.upload-symbol{font-size:27px;color:#5988cb}.import-box strong{display:block;font-size:12px;margin:8px}.import-box p,.small-note{font-size:10px;line-height:1.7;color:#8a98aa}.import-box input{display:block;width:100%;font-size:10px;margin:15px 0}.divider-line{height:1px;background:var(--line);margin:22px 0}.danger-panel{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-top:16px}.danger-panel p{font-size:11px;color:var(--muted);margin-bottom:0}.progress-panel{margin-top:20px}.activity-row{display:flex;align-items:center;justify-content:space-between;padding:13px 0;border-bottom:1px solid #eef1f6;font-size:11px;gap:10px}.activity-row:last-child{border-bottom:0}.activity-row small{color:var(--muted)}.footer{display:flex;justify-content:space-between;color:#9aa6b5;font-size:10px;padding:32px 0 20px;margin-top:15px}.modal-backdrop{position:fixed;inset:0;background:#10233b80;z-index:20;display:grid;place-items:center;padding:20px}.modal{background:#fff;border-radius:18px;padding:29px;width:min(100%,390px);position:relative;box-shadow:0 25px 90px #10233b40}.modal-close{position:absolute;right:15px;top:12px;border:0;background:transparent;font-size:25px;color:#718097}.modal-brand{width:42px;height:42px;border-radius:12px;background:var(--navy);color:white;display:grid;place-items:center;font-family:'Noto Sans JP';font-size:24px}.modal h2{font-size:21px;margin:15px 0 5px}.modal>p{font-size:11px;line-height:1.7;color:var(--muted)}.modal form{display:grid;gap:13px;margin:20px 0 12px}.auth-divider{text-align:center;color:#9aa6b5;font-size:10px;margin:14px 0}.toast{position:fixed;bottom:22px;right:22px;background:#17345c;color:white;padding:12px 17px;border-radius:10px;font-size:12px;box-shadow:var(--shadow);z-index:30;opacity:0;pointer-events:none;transform:translateY(8px);transition:.2s}.toast.show{opacity:1;transform:none}
@media(max-width:1150px){.main{padding:0 24px}.category-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.study-layout{grid-template-columns:1fr}.study-aside{grid-template-columns:repeat(2,minmax(0,1fr))}.manage-grid{grid-template-columns:1fr}.hero-art{right:-4%;width:43%}.hero h2{font-size:25px}}
@media(max-width:760px){.sidebar{position:static;width:auto;height:auto;padding:13px 15px;border-right:0;border-bottom:1px solid var(--line)}.brand{padding:0 3px 12px}.brand-mark{height:36px;width:36px}.user-panel{display:none}.nav{display:flex;overflow-x:auto;gap:5px}.nav-item{white-space:nowrap;padding:9px 10px;font-size:11px;gap:6px}.nav-item span{font-size:14px;width:auto}.sidebar-bottom{display:none}.main{margin:0;padding:0 15px}.topbar{height:78px;margin-bottom:18px}.topbar h1{font-size:21px}.today{display:none}.icon-button{display:block}.hero{padding:24px 20px;min-height:250px}.hero-copy{max-width:78%}.hero h2{font-size:24px}.hero h2 em{font-size:17px}.hero p{font-size:11px}.hero-art{opacity:.28;width:60%;right:-15%}.hero-kanji{font-size:42px}.section-heading{margin-top:23px}.category-grid,.stats-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.category-card{padding:13px;min-height:135px}.cat-icon{margin-bottom:9px}.stat-card{padding:14px}.stat-card strong{font-size:23px}.stat-foot{line-height:1.5}.toolbar{flex-wrap:wrap}.search-wrap{flex-basis:100%}.toolbar select{height:38px;flex:1;min-width:0}.quick-row,.knowledge-row{padding:11px;gap:10px}.item-symbol{width:37px;height:37px;font-size:16px}.item-title{font-size:14px}.row-actions{flex-direction:column}.study-filters{grid-template-columns:repeat(2,minmax(0,1fr))}.study-aside{grid-template-columns:1fr}.flashcard-wrap{padding:18px 12px;min-height:350px}.flash-term{font-size:30px}.answer-options{grid-template-columns:1fr}.form-grid{grid-template-columns:1fr}.span-2{grid-column:auto}.panel{padding:17px}.danger-panel{align-items:flex-start;flex-direction:column}.footer{font-size:9px}.top-actions{gap:5px}}

/* Hero alignment fix */
@media(min-width:761px){.hero-art{right:3%;width:42%;overflow:visible}.sun{width:200px;height:200px;top:50%;left:50%;right:auto;transform:translate(-50%,-50%)}.hero-kanji{font-size:46px;letter-spacing:3px;white-space:nowrap}.orbit-one{top:12%;right:5%}.orbit-two{left:5%;bottom:15%}.hero-caption{right:auto;left:50%;transform:translateX(-50%);white-space:nowrap}}

/* Four separate vocabulary libraries */
.level-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin:18px 0 30px}
.level-card{border:1px solid #dce5ef;background:#fff;border-radius:18px;padding:20px 16px;text-align:left;display:flex;flex-direction:column;gap:9px;cursor:pointer;min-height:176px;box-shadow:0 4px 16px rgba(31,55,84,.04);transition:transform .15s,border-color .15s}
.level-card:hover{transform:translateY(-3px);border-color:#6497e0}
.level-card strong{font-size:26px;color:#243d5a;line-height:1.2}
.level-card small{font-size:13px;color:#667789;line-height:1.5}
.level-tag{font-size:11px;font-weight:800;letter-spacing:.08em;color:#5179aa}
.level-action{font-size:13px;font-weight:700;color:#2d6ac4;margin-top:auto}
.level-card.technical{background:#eef8f4;border-color:#bfe2d3}
.level-card.technical strong{font-size:21px;color:#1b6452}
.topic-filter{display:flex;gap:9px;align-items:center;margin:12px 0 16px;color:#53657a;font-size:13px}
.topic-filter select{max-width:320px;border:1px solid #dce5ef;background:#fff;border-radius:9px;padding:10px}
.topic-filter.hidden{display:none!important}
.study-quick-actions{margin:12px 0}
@media(max-width:950px){.level-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:500px){.level-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.level-card{padding:14px 11px;min-height:160px}.level-card strong{font-size:23px}.level-card.technical strong{font-size:17px}}

/* Kanji detail */
.kanji-extra{grid-column:1/-1;background:#f5f3ff;border:1px solid #ded8ff;border-radius:14px;padding:17px;margin:6px 0 12px;}
.kanji-editor-title{font-weight:800;color:#4c3da5;margin-bottom:14px}.kanji-extra .form-grid{gap:12px}
.kanji-detail{margin-top:12px;border:1px solid #e5e5ef;border-radius:13px;padding:14px;background:#fbfbff;max-width:100%;}
.kanji-readings{display:flex;flex-wrap:wrap;gap:9px;margin:10px 0}.kanji-reading{background:#f0edff;border-radius:8px;padding:8px 12px;font-size:14px}.kanji-reading strong{color:#5946ab}.kanji-examples{display:grid;gap:8px;margin-top:11px}.kanji-example{display:flex;flex-direction:column;align-items:flex-start;gap:4px;border-top:1px solid #eceaf5;padding:12px 4px}.kanji-example strong{display:block;font-size:18px;line-height:1.5}.kanji-example small{display:block;font-size:14px;color:#667085;line-height:1.5}.kanji-example span{display:block;font-size:14px;line-height:1.5;color:#252b3b}.kanji-study{margin:14px 0;text-align:left}.kanji-study .kanji-example{padding:10px 3px}

/* Han Viet and memorable Kanji notes */
.kanji-hanviet{font-weight:700;color:#473b8c;font-size:13px;margin-bottom:8px}.kanji-mnemonic{margin-top:12px;padding:12px 14px;background:#fff8e8;border:1px solid #f2deab;border-radius:10px;color:#56451c}.kanji-mnemonic strong{font-size:13px}.kanji-mnemonic p{white-space:normal;line-height:1.7;margin:7px 0 0;font-size:13px;overflow-wrap:anywhere}

/* Kanji examples: Kanji | Hiragana | Vietnamese meaning on one horizontal row */
.kanji-example{display:grid;grid-template-columns:minmax(80px,max-content) minmax(90px,max-content) minmax(0,1fr);align-items:center;column-gap:24px;row-gap:4px;text-align:left;width:100%;}
.kanji-example strong,.kanji-example small,.kanji-example span{display:block;margin:0;min-width:0;overflow-wrap:anywhere;}
.kanji-example strong{font-size:18px;}
.kanji-example small{font-size:14px;}
.kanji-example span{font-size:14px;}
@media(max-width:520px){.kanji-example{grid-template-columns:minmax(0,1fr) minmax(0,1fr) minmax(0,1.2fr);column-gap:10px}.kanji-example strong{font-size:15px}.kanji-example small,.kanji-example span{font-size:12px}}

.kanji-radicals{margin-top:12px;padding:12px 14px;background:#eef7ff;border:1px solid #c9dfff;border-radius:10px;color:#22466d}.kanji-radicals strong{font-size:13px}.kanji-radicals p{margin:7px 0 0;line-height:1.7;font-size:13px;overflow-wrap:anywhere}

/* Ngữ pháp N4: trình bày cấu trúc / ví dụ */
.grammar-detail{margin-top:12px;padding:12px 14px;border:1px solid #e2e8f0;border-radius:12px;background:#f8fafc;white-space:normal;line-height:1.8}.grammar-detail>div+div{margin-top:8px}

/* Động từ: trang tra cứu các thể */
.forms-intro,.forms-panel,.forms-reference{background:#fff;border:1px solid #dde5f1;border-radius:18px;padding:22px;margin-bottom:18px;line-height:1.8;color:#263d5b}
.forms-intro p{margin:8px 0}.forms-selector{display:flex;align-items:center;gap:15px;flex-wrap:wrap;margin:20px 0}.forms-selector label{font-weight:700}.forms-selector select{min-width:280px;max-width:100%;padding:12px;border:1px solid #d6e1f0;border-radius:12px;background:white;color:#183558;font:inherit}
.forms-panel h3{font-size:22px;margin:0 0 8px}.forms-panel h4{font-size:16px;margin:18px 0 5px}.forms-panel p{margin:6px 0}.forms-table-scroll{overflow-x:auto}.forms-table{width:100%;border-collapse:collapse;min-width:550px;text-align:left}.forms-table th,.forms-table td{border-bottom:1px solid #e3e9f1;padding:11px;vertical-align:top;white-space:normal}.forms-table th{background:#f4f7fd;color:#183c6e}.forms-example{display:flex;flex-direction:column;background:#f1f6ff;border-radius:12px;padding:16px;gap:5px}.forms-example strong{font-size:19px}.forms-example span:nth-child(2){color:#4e6b8f}.forms-muted{font-size:13px;color:#667b96}