:root{--red:#d72c2c;--red2:#a9101a;--gold:#f3b83f;--ink:#172033;--muted:#667085;--bg:#fffaf6;--card:#fff;--line:#eadfd7;--green:#15925e;--shadow:0 14px 40px rgba(44,27,20,.09)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.6}a{color:inherit;text-decoration:none}.container{width:min(1160px,calc(100% - 32px));margin:auto}.topbar{position:sticky;top:0;z-index:50;background:rgba(255,250,246,.94);backdrop-filter:blur(12px);border-bottom:1px solid rgba(234,223,215,.8)}.nav-wrap{min-height:74px;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;gap:10px;align-items:center;font-weight:900;font-size:20px}.brand small{display:block;font-size:10px;letter-spacing:.06em;color:var(--muted);font-weight:600}.brand-mark{width:42px;height:42px;border-radius:13px;background:linear-gradient(135deg,var(--red),var(--red2));display:grid;place-items:center;color:white;font-family:serif;font-size:25px;box-shadow:0 8px 20px rgba(215,44,44,.22)}.nav{display:flex;align-items:center;gap:22px;font-size:14px;font-weight:700}.nav a:hover,.nav a.active{color:var(--red)}.menu-btn{display:none;border:0;background:white;border-radius:10px;padding:9px 12px;font-size:20px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:linear-gradient(135deg,var(--red),var(--red2));color:#fff!important;border:0;border-radius:12px;padding:13px 20px;font-weight:800;cursor:pointer;box-shadow:0 10px 25px rgba(215,44,44,.18)}.btn:hover{transform:translateY(-1px)}.btn-sm{padding:9px 14px;border-radius:10px}.btn-outline{background:transparent;color:var(--red)!important;border:1px solid var(--red);box-shadow:none}.btn-light{background:#fff;color:var(--red)!important;box-shadow:none}.hero{padding:70px 0 55px;background:radial-gradient(circle at 80% 20%,rgba(243,184,63,.28),transparent 30%),linear-gradient(180deg,#fff8f1,var(--bg))}.hero-grid{display:grid;grid-template-columns:1.12fr .88fr;gap:50px;align-items:center}.eyebrow{display:inline-flex;gap:8px;align-items:center;background:#fff0e7;border:1px solid #f7d9c8;color:var(--red2);border-radius:999px;padding:7px 12px;font-size:13px;font-weight:800}.hero h1{font-size:clamp(42px,6vw,76px);line-height:1.02;margin:18px 0}.hero h1 span{color:var(--red)}.hero p{font-size:19px;color:var(--muted);max-width:650px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:28px 0}.hero-stats{display:flex;gap:28px;flex-wrap:wrap}.hero-stats strong{display:block;font-size:23px}.hero-stats span{font-size:12px;color:var(--muted)}.mandarin-card{background:linear-gradient(145deg,#9d101a,#e63b36);color:#fff;border-radius:32px;padding:34px;box-shadow:0 26px 70px rgba(132,17,25,.28);transform:rotate(1deg);position:relative;overflow:hidden}.mandarin-card:after{content:'中文';position:absolute;right:-15px;bottom:-42px;font-family:serif;font-size:120px;opacity:.09}.mandarin-card .hanzi{font-family:serif;font-size:88px;line-height:1}.mandarin-card .pinyin{font-size:20px;color:#ffd77c;font-weight:800}.mandarin-card .meaning{font-size:30px;font-weight:900;margin:8px 0 20px}.speech-row{display:flex;align-items:center;gap:12px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.18);padding:14px;border-radius:16px}.speech-btn{width:45px;height:45px;border:0;border-radius:50%;background:white;color:var(--red);font-size:20px;cursor:pointer}.section{padding:76px 0}.section.alt{background:#fff}.section-title{text-align:center;max-width:720px;margin:0 auto 38px}.section-title h2{font-size:clamp(30px,4vw,46px);line-height:1.12;margin:8px 0}.section-title p{color:var(--muted)}.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.feature,.card{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:24px;box-shadow:var(--shadow)}.feature-icon{width:52px;height:52px;border-radius:15px;background:#fff0e7;display:grid;place-items:center;font-size:25px}.feature h3{margin:14px 0 5px}.feature p{margin:0;color:var(--muted)}.weeks{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.week{background:#fff;border:1px solid var(--line);border-radius:15px;padding:16px}.week b{display:block;color:var(--red);font-size:12px}.week span{font-weight:800}.cta{background:linear-gradient(135deg,#8e1019,#df342f);color:white;border-radius:28px;padding:44px;display:flex;align-items:center;justify-content:space-between;gap:25px}.cta h2{font-size:36px;line-height:1.15;margin:0}.footer{background:#17161c;color:#d7d5dc;padding:50px 0 0;margin-top:60px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px}.footer-grid strong,.footer-grid a{display:block;margin-bottom:10px}.footer-grid a{color:#aaa7b0}.footer-brand{color:#fff}.copyright{text-align:center;border-top:1px solid #302e35;padding:18px;margin-top:35px;font-size:13px;color:#9996a0}.auth-wrap{min-height:72vh;display:grid;place-items:center;padding:50px 0}.auth-card{width:min(510px,100%);background:white;border:1px solid var(--line);border-radius:24px;padding:32px;box-shadow:var(--shadow)}.auth-card h1{margin:0}.form-group{margin:16px 0}.form-group label{display:block;font-weight:800;font-size:13px;margin-bottom:7px}.input,select,textarea{width:100%;padding:13px 14px;border:1px solid #d9d3cf;border-radius:11px;background:#fff;font:inherit}.input:focus,select:focus,textarea:focus{outline:3px solid rgba(215,44,44,.1);border-color:var(--red)}.form-note{font-size:13px;color:var(--muted)}.alert{margin-top:18px;padding:13px 16px;border-radius:12px;font-weight:700}.alert.success{background:#e9f8f1;color:#08744a;border:1px solid #bcead4}.alert.error{background:#fff0f0;color:#a71922;border:1px solid #f3c1c4}.page-head{padding:38px 0 20px}.page-head h1{font-size:38px;margin:0}.page-head p{color:var(--muted);margin:4px 0}.dashboard-grid{display:grid;grid-template-columns:1.6fr .9fr;gap:22px}.welcome{background:linear-gradient(135deg,#98111a,#df3732);color:white;border-radius:24px;padding:28px}.progress-ring{width:120px;height:120px;border-radius:50%;display:grid;place-items:center;background:conic-gradient(var(--gold) var(--p),rgba(255,255,255,.2) 0);position:relative}.progress-ring:before{content:'';position:absolute;width:90px;height:90px;background:#b51d25;border-radius:50%}.progress-ring strong{z-index:1;font-size:26px}.welcome-flex{display:flex;align-items:center;justify-content:space-between;gap:20px}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:20px 0}.stat{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px}.stat b{font-size:27px;display:block}.stat span{font-size:12px;color:var(--muted)}.lesson-list{display:grid;gap:12px}.lesson-row{display:grid;grid-template-columns:50px 1fr auto;align-items:center;gap:14px;background:#fff;border:1px solid var(--line);border-radius:15px;padding:14px}.lesson-num{width:45px;height:45px;border-radius:13px;background:#fff0e7;color:var(--red);display:grid;place-items:center;font-weight:900}.lesson-row h3{font-size:16px;margin:0}.lesson-row p{font-size:13px;color:var(--muted);margin:2px 0}.badge{display:inline-flex;border-radius:999px;padding:5px 9px;font-size:11px;font-weight:800;background:#f1f2f4;color:#596273}.badge.done{background:#e4f7ed;color:#08744a}.sidebar-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:21px;margin-bottom:18px}.sidebar-card h3{margin-top:0}.streak{display:flex;gap:7px}.streak span{width:30px;height:30px;border-radius:9px;background:#f4eee9;display:grid;place-items:center;font-size:12px}.streak span.on{background:#ffefe2;color:#e65716}.syllabus-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.module-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px;position:relative}.module-card.done{border-color:#a9dfc6}.module-card h3{font-size:18px;margin:9px 0}.module-card p{font-size:13px;color:var(--muted)}.module-card .week-no{color:var(--red);font-size:12px;font-weight:900}.lesson-layout{display:grid;grid-template-columns:1fr 300px;gap:24px}.lesson-content{background:#fff;border:1px solid var(--line);border-radius:22px;padding:30px}.lesson-content h2{margin-top:28px}.lesson-content table{width:100%;border-collapse:collapse}.lesson-content th,.lesson-content td{padding:12px;border-bottom:1px solid var(--line);text-align:left}.hanzi-lg{font-size:31px;font-family:serif}.audio-mini{border:0;background:#fff0e7;color:var(--red);border-radius:9px;padding:8px;cursor:pointer}.objectives{background:#fff8ec;border:1px solid #f6dfb5;border-radius:15px;padding:17px}.lesson-nav{display:flex;justify-content:space-between;gap:12px;margin-top:25px}.quiz-option{display:block;background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px;margin:9px 0;cursor:pointer}.quiz-option:hover{border-color:var(--red)}.flash-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.flashcard{height:220px;perspective:1000px;cursor:pointer}.flash-inner{position:relative;width:100%;height:100%;transition:transform .55s;transform-style:preserve-3d}.flashcard.flipped .flash-inner{transform:rotateY(180deg)}.flash-front,.flash-back{position:absolute;inset:0;backface-visibility:hidden;background:#fff;border:1px solid var(--line);border-radius:20px;display:grid;place-items:center;text-align:center;padding:20px;box-shadow:var(--shadow)}.flash-back{transform:rotateY(180deg);background:#9f1520;color:#fff}.flash-front .hz{font-family:serif;font-size:62px}.dict-list{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.dict-item{background:white;border:1px solid var(--line);border-radius:13px;padding:14px;display:grid;grid-template-columns:55px 1fr auto;align-items:center;gap:12px}.dict-hanzi{font-size:27px;font-family:serif;color:var(--red)}.chat-shell{display:grid;grid-template-columns:300px 1fr;gap:20px}.teacher-profile{background:linear-gradient(160deg,#9a111b,#df4037);color:white;border-radius:22px;padding:25px;text-align:center}.teacher-avatar{width:110px;height:110px;border-radius:50%;background:#fff0e7;margin:auto;display:grid;place-items:center;font-size:54px;border:5px solid rgba(255,255,255,.35)}.chatbox{background:#fff;border:1px solid var(--line);border-radius:22px;overflow:hidden}.messages{height:430px;overflow:auto;padding:22px;background:#fffaf7}.message{max-width:75%;padding:12px 15px;border-radius:16px;margin:8px 0}.message.bot{background:#fff0e7}.message.user{background:#d72c2c;color:white;margin-left:auto}.chat-form{display:flex;gap:10px;padding:14px;border-top:1px solid var(--line)}.chat-form .input{flex:1}.admin-shell{display:grid;grid-template-columns:230px 1fr;min-height:75vh;gap:24px}.admin-nav{background:#211f26;color:#fff;border-radius:18px;padding:16px;height:max-content}.admin-nav a{display:block;padding:10px 12px;border-radius:9px;color:#c8c5ce}.admin-nav a:hover,.admin-nav a.active{background:#34313b;color:#fff}.admin-main{min-width:0}.table-wrap{overflow:auto;background:#fff;border:1px solid var(--line);border-radius:16px}.table{width:100%;border-collapse:collapse}.table th,.table td{padding:12px 14px;border-bottom:1px solid var(--line);text-align:left;white-space:nowrap}.table th{font-size:12px;color:var(--muted);background:#fffaf7}.actions{display:flex;gap:8px}.text-red{color:var(--red)}.text-muted{color:var(--muted)}.mt-0{margin-top:0}.mb-0{margin-bottom:0}
@media(max-width:900px){.hero-grid,.dashboard-grid,.lesson-layout,.chat-shell,.admin-shell{grid-template-columns:1fr}.grid-3,.syllabus-grid{grid-template-columns:repeat(2,1fr)}.weeks{grid-template-columns:repeat(3,1fr)}.flash-grid{grid-template-columns:repeat(3,1fr)}.nav{display:none;position:absolute;top:74px;left:16px;right:16px;background:#fff;border:1px solid var(--line);border-radius:15px;padding:15px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch}.nav.open{display:flex}.menu-btn{display:block}.admin-nav{display:flex;gap:4px;overflow:auto}.admin-nav a{white-space:nowrap}}
@media(max-width:600px){.hero{padding-top:40px}.hero-grid{gap:28px}.hero h1{font-size:45px}.mandarin-card{padding:25px}.grid-3,.syllabus-grid,.dict-list{grid-template-columns:1fr}.weeks{grid-template-columns:repeat(2,1fr)}.flash-grid{grid-template-columns:repeat(2,1fr)}.stats-grid{grid-template-columns:1fr}.welcome-flex,.cta{align-items:flex-start;flex-direction:column}.lesson-row{grid-template-columns:46px 1fr}.lesson-row .btn{grid-column:1/-1}.footer-grid{grid-template-columns:1fr}.lesson-content{padding:20px}.chat-form{flex-direction:column}}

/* MandarinOne v2.0 — Paid Learning */
.nav{gap:14px;font-size:13px}.btn-lg{padding:16px 25px;font-size:17px}.badge.premium{background:#fff1c7;color:#8b5b00}.badge.warning{background:#fff4d6;color:#8a5a00}.badge.danger{background:#ffe6e8;color:#a71922}.premium-chip{margin-top:18px;padding:10px 12px;border-radius:12px;background:rgba(0,0,0,.15);font-size:12px;font-weight:800}.pricing-section{background:radial-gradient(circle at 50% 0,rgba(243,184,63,.18),transparent 35%)}.pricing-section .section-title h1{font-size:clamp(36px,5vw,58px);margin:10px 0}.pricing-card{max-width:980px;margin:auto;background:#fff;border:2px solid #e9c678;border-radius:28px;padding:38px;box-shadow:0 28px 80px rgba(57,34,18,.14);position:relative;overflow:hidden}.pricing-card:before{content:'汉';position:absolute;right:-20px;top:-65px;font:240px/1 serif;color:rgba(215,44,44,.045)}.pricing-ribbon{position:absolute;right:-58px;top:28px;transform:rotate(38deg);background:var(--red);color:#fff;padding:8px 70px;font-size:11px;font-weight:900;letter-spacing:.08em}.pricing-grid{display:grid;grid-template-columns:1fr 1fr;gap:45px;position:relative}.price{margin-top:24px;display:flex;flex-direction:column}.price small,.price span{color:var(--muted)}.price strong{font-size:55px;line-height:1;color:var(--red);margin:5px 0}.check-list{list-style:none;padding:0;margin:0 0 25px}.check-list li{position:relative;padding:8px 0 8px 30px;border-bottom:1px dashed var(--line)}.check-list li:before{content:'✓';position:absolute;left:0;top:8px;width:21px;height:21px;border-radius:50%;background:#e5f7ee;color:var(--green);display:grid;place-items:center;font-size:12px;font-weight:900}.check-list.compact li{padding-top:5px;padding-bottom:5px;border:0}.check-list.compact li:before{top:5px}.secure-note{max-width:850px;margin:24px auto 0;display:flex;gap:15px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px}.secure-note>span{font-size:28px}.secure-note p{margin:3px 0;color:var(--muted)}.checkout-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:24px;align-items:start}.checkout-total{display:flex;align-items:center;justify-content:space-between;border-top:1px solid var(--line);margin-top:22px;padding-top:18px}.checkout-total strong{font-size:30px;color:var(--red)}.payment-option{display:flex;gap:11px;align-items:flex-start;border:1px solid var(--line);padding:14px;border-radius:13px;margin:9px 0;cursor:pointer}.payment-option:has(input:checked){border-color:var(--red);background:#fff6f2}.payment-option input{margin-top:5px}.payment-option span{display:flex;flex-direction:column}.payment-option small{color:var(--muted)}.access-summary{display:flex;align-items:center;justify-content:space-between;gap:20px;background:#fff;border:1px solid var(--line);border-radius:20px;padding:22px;margin-bottom:24px}.access-summary h2{margin:7px 0 0}.details-list{margin:20px 0}.details-list>div{display:flex;justify-content:space-between;gap:15px;padding:11px 0;border-bottom:1px solid var(--line)}.details-list dt{color:var(--muted)}.details-list dd{margin:0;font-weight:800;text-align:right}.bank-box{display:grid;grid-template-columns:130px 1fr;gap:10px 20px;background:#fff8ec;border:1px solid #f0d6a0;border-radius:16px;padding:18px}.bank-box span{color:var(--muted)}.account-number{font-size:22px;letter-spacing:.04em}.premium-lock{display:flex;gap:24px;align-items:center;background:linear-gradient(135deg,#201d28,#3b2431);color:#fff;border-radius:24px;padding:34px;margin-bottom:30px;box-shadow:var(--shadow)}.premium-lock.compact-lock{padding:25px}.premium-lock h2{margin:7px 0}.premium-lock p{color:#ddd}.lock-icon,.lock-orb{flex:0 0 auto;width:100px;height:100px;border-radius:28px;background:rgba(255,255,255,.1);display:grid;place-items:center;font-size:45px}.locked-card{background:linear-gradient(180deg,#fff,#f8f5f2);opacity:.88}.locked-welcome{background:linear-gradient(135deg,#25212d,#5a2b39)}.lock-orb{width:120px;height:120px;font-size:50px}.resource-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.resource-card{display:grid;grid-template-columns:85px 1fr;gap:18px;background:#fff;border:1px solid var(--line);border-radius:20px;padding:22px}.resource-card h3{margin:0}.resource-card p{color:var(--muted)}.pdf-icon{width:76px;height:90px;border-radius:12px;background:linear-gradient(145deg,#ee3c3c,#a9101a);color:#fff;display:grid;place-items:center;font-weight:900;box-shadow:0 12px 25px rgba(169,16,26,.2)}.profile-grid{display:grid;grid-template-columns:1fr 300px;gap:24px;align-items:start}.filter-bar{display:grid;grid-template-columns:1fr 220px auto;gap:10px;margin-bottom:18px}.payment-admin-list{display:grid;gap:14px}.payment-admin-card{padding:20px}.payment-card-head{display:flex;justify-content:space-between;gap:20px}.payment-card-head h3{margin:8px 0 0}.payment-card-head p{margin:2px 0;color:var(--muted)}.payment-card-head>strong{font-size:25px;color:var(--red)}.payment-meta{display:flex;gap:18px;flex-wrap:wrap;background:#fff9f4;border-radius:10px;padding:10px;margin:12px 0;font-size:12px;color:var(--muted)}.inline-admin-form{display:grid;grid-template-columns:1fr auto auto;gap:8px;width:100%}.user-plan-form{display:grid;grid-template-columns:100px 145px auto;gap:5px;min-width:380px}.dialogue-box{display:grid;gap:10px}.dialogue-line{display:grid;grid-template-columns:38px 1fr auto;gap:12px;align-items:center;background:#fff8f2;border:1px solid #f0dfd2;border-radius:14px;padding:13px}.speaker{width:34px;height:34px;border-radius:50%;background:var(--red);color:#fff;display:grid;place-items:center;font-weight:900}.dialogue-hanzi{font-size:18px}.dialogue-pinyin{font-weight:700;color:var(--red2)}.dialogue-meaning{font-size:13px;color:var(--muted)}.grammar-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.note-card{background:#f5f8fc;border:1px solid #dbe4ef;border-radius:14px;padding:16px}.note-card p{margin:5px 0 0;color:var(--muted)}.culture-note{background:#fff8dc;border-left:5px solid var(--gold);border-radius:12px;padding:17px;margin-top:22px}.culture-note p{margin-bottom:0}.practice-list li{margin:10px 0}.answer-box{background:#edf8f3;border:1px solid #c4e6d5;border-radius:14px;padding:14px;margin-top:15px}.answer-box summary{cursor:pointer;font-weight:900;color:#08744a}.hanzi-practice{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.hanzi-practice>div{min-height:130px;border:1px dashed #c7b9ad;border-radius:14px;display:flex;flex-direction:column;align-items:center;justify-content:center;background-image:linear-gradient(to right,transparent 49.5%,#eee 50%,transparent 50.5%),linear-gradient(to bottom,transparent 49.5%,#eee 50%,transparent 50.5%)}.hanzi-practice span{font:56px/1 serif;background:rgba(255,255,255,.85)}.hanzi-practice small{background:#fff;color:var(--muted)}
@media(max-width:1050px){.nav{gap:9px;font-size:12px}.nav a{white-space:nowrap}}
@media(max-width:900px){.pricing-grid,.checkout-grid,.profile-grid{grid-template-columns:1fr}.resource-grid{grid-template-columns:1fr}.filter-bar{grid-template-columns:1fr}.inline-admin-form{grid-template-columns:1fr}.user-plan-form{grid-template-columns:1fr;min-width:230px}.premium-lock{align-items:flex-start}.grammar-grid{grid-template-columns:1fr}}
@media(max-width:600px){.pricing-card{padding:25px 19px}.price strong{font-size:44px}.access-summary,.premium-lock,.payment-card-head{align-items:flex-start;flex-direction:column}.lock-icon,.lock-orb{width:75px;height:75px;font-size:34px}.resource-card{grid-template-columns:1fr}.hanzi-practice{grid-template-columns:repeat(2,1fr)}.bank-box{grid-template-columns:1fr}.pricing-ribbon{display:none}}

/* MandarinOne v2.1 — Free Starter */
.badge.free{background:#e5f7ee;color:#08744a;border:1px solid #bfe7d2}.free-access-banner{display:flex;gap:24px;align-items:center;justify-content:space-between;background:linear-gradient(135deg,#f0fff7,#fff9ec);border:1px solid #bfe7d2;border-radius:24px;padding:28px;margin-bottom:28px;box-shadow:var(--shadow)}.free-access-banner h2,.free-access-banner h3{margin:7px 0}.free-access-banner p{margin:5px 0;color:var(--muted)}.free-access-banner.compact{padding:18px 20px}.trial-card{max-width:980px;margin:0 auto 28px;background:linear-gradient(135deg,#effcf5,#fff9e9);border:2px solid #bfe7d2;border-radius:24px;padding:28px;display:flex;align-items:center;justify-content:space-between;gap:30px;box-shadow:var(--shadow)}.trial-card h2{margin:8px 0}.trial-card p{color:var(--muted)}
@media(max-width:700px){.free-access-banner,.trial-card{align-items:flex-start;flex-direction:column}}