:root{--ink:#171717;--soft:#4b4944;--muted:#6b6760;--paper:#fbf7ef;--paper2:#f3ede2;--white:#fff;--dark:#101417;--dark2:#192126;--gold:#b28231;--gold-dark:#76501d;--gold-light:#f0d89d;--line:rgba(23,23,23,.13);--shadow:0 18px 48px rgba(16,20,23,.12);--radius:6px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:76px}body{margin:0;color:var(--ink);background:var(--paper);font:17px/1.7 "PingFang SC","PingFang TC","Microsoft YaHei","Microsoft JhengHei","Noto Sans CJK SC","Noto Sans CJK TC",Arial,sans-serif;-webkit-font-smoothing:antialiased}img{display:block;max-width:100%}a{color:inherit;text-decoration:none}button{font:inherit}.container{width:min(1140px,calc(100% - 48px));margin:auto}.skip-link{position:fixed;top:8px;left:8px;z-index:100;transform:translateY(-150%);padding:10px 14px;background:#fff;color:#111;border:2px solid var(--gold-dark)}.skip-link:focus{transform:none}.site-header{position:fixed;inset:0 0 auto;z-index:60;color:#fff;background:rgba(13,17,19,.88);border-bottom:1px solid rgba(255,255,255,.12);backdrop-filter:blur(14px)}.nav{width:min(1240px,calc(100% - 40px));min-height:72px;margin:auto;display:flex;align-items:center;gap:22px}.brand{display:flex;align-items:center;gap:11px;flex:0 0 auto}.brand-mark{width:40px;height:40px;display:grid;place-items:center;border:1px solid var(--gold);color:var(--gold-light);font:700 21px/1 Georgia,serif}.brand strong,.brand small{display:block}.brand strong{font-family:"Songti SC","Songti TC","STSong",serif;font-size:20px;line-height:1.15}.brand small{margin-top:2px;color:rgba(255,255,255,.58);font-size:10px}.nav-links{margin-left:auto;display:flex;align-items:center;gap:24px}.nav-links>a:not(.btn){color:rgba(255,255,255,.78);font-size:15px}.nav-tools{display:flex;align-items:center;gap:10px}.language-switch{display:flex;padding:2px;border:1px solid rgba(255,255,255,.24);border-radius:5px}.language-switch button{width:34px;height:34px;padding:0;border:0;border-radius:3px;background:transparent;color:rgba(255,255,255,.68);cursor:pointer}.language-switch button[aria-pressed=true]{background:#fff;color:#111}.youtube-link,.youtube-button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px}.youtube-link{padding:0 11px;border:1px solid rgba(255,255,255,.2);font-size:13px}.youtube-icon{position:relative;width:24px;height:17px;display:inline-block;border-radius:5px;background:#f03}.youtube-icon:after{content:"";position:absolute;left:10px;top:5px;border:4px solid transparent;border-left:6px solid #fff}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:52px;padding:13px 22px;border:1px solid #d5aa5b;border-radius:var(--radius);background:linear-gradient(135deg,#c79b45,#a87528);color:#fff;font-weight:800;box-shadow:0 12px 26px rgba(157,113,49,.24);cursor:pointer}.btn-small{min-height:44px;padding:10px 15px;font-size:14px}.btn:hover,.btn:focus-visible{filter:brightness(1.08);transform:translateY(-1px)}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #ffcf65;outline-offset:3px}.hero{position:relative;min-height:100svh;overflow:hidden;color:#fff;background:linear-gradient(115deg,rgba(8,12,13,.98) 0%,rgba(14,20,23,.92) 46%,rgba(14,20,23,.34) 78%),image-set(url("hero-bg-v2-1440.avif") type("image/avif"),url("hero-bg-v2-1440.webp") type("image/webp"));background-position:center;background-size:cover}.hero:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 55%,rgba(0,0,0,.65));pointer-events:none}.hero-watermarks span{position:absolute;color:rgba(255,255,255,.045);font:900 clamp(110px,15vw,220px)/1 "Songti SC","STSong",serif}.hero-watermarks span:nth-child(1){left:5%;top:16%}.hero-watermarks span:nth-child(2){left:25%;bottom:7%}.hero-watermarks span:nth-child(3){right:5%;bottom:12%}.hero-portrait{position:absolute;z-index:1;right:max(0px,calc((100vw - 1240px)/2));bottom:0;width:min(48vw,620px);height:min(88vh,790px);display:flex;align-items:flex-end;justify-content:center}.hero-portrait img{width:auto;max-height:100%;object-fit:contain;filter:drop-shadow(0 24px 36px rgba(0,0,0,.42))}.hero-inner{position:relative;z-index:2;width:min(1240px,calc(100% - 48px));min-height:100svh;margin:auto;padding:150px 0 76px;display:flex;align-items:flex-end}.hero-copy{max-width:610px}.hero-proof{margin:0 0 14px;color:var(--gold-light);font-size:15px;font-weight:800}.hero h1{margin:0 0 18px;font:900 clamp(58px,8vw,104px)/.98 "Songti SC","Songti TC","STSong",serif}.hero h1 span{display:block;margin-top:8px;color:rgba(255,255,255,.65);font:700 clamp(24px,3vw,38px)/1.1 Georgia,serif}.hero-subtitle{max-width:590px;margin:0 0 26px;color:rgba(255,255,255,.84);font-size:20px;line-height:1.72}.cta-note{max-width:520px;margin:12px 0 0;color:rgba(255,255,255,.62);font-size:13px}.proof-bar{position:relative;z-index:3;margin-top:-34px}.proof-grid{width:min(1120px,calc(100% - 48px));margin:auto;display:grid;grid-template-columns:repeat(4,1fr);background:rgba(255,255,255,.97);border:1px solid rgba(178,130,49,.3);box-shadow:var(--shadow)}.proof-grid>div{min-height:96px;padding:19px 21px;border-right:1px solid var(--line)}.proof-grid>div:last-child{border:0}.proof-grid strong,.proof-grid span{display:block}.proof-grid strong{font:800 19px/1.3 "Songti SC","Songti TC","STSong",serif}.proof-grid span{margin-top:5px;color:var(--muted);font-size:13px}.section{padding:96px 0}.section-head{max-width:740px;margin:0 0 36px}.section-head.center{text-align:center;margin-left:auto;margin-right:auto}.kicker{display:block;margin-bottom:9px;color:var(--gold-dark);font-size:13px;font-weight:900}.section-head h2{margin:0;font:900 clamp(34px,4.5vw,54px)/1.18 "Songti SC","Songti TC","STSong",serif}.section-head p{margin:14px 0 0;color:var(--soft);font-size:18px}.pain-section{background:linear-gradient(#fff,var(--paper))}.pain-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.pain-card{--image:linear-gradient(135deg,#343a3b,#101417);position:relative;min-height:300px;padding:20px;display:flex;flex-direction:column;justify-content:space-between;overflow:hidden;border-radius:var(--radius);color:#fff;background:linear-gradient(180deg,rgba(16,20,23,.12),rgba(16,20,23,.92)),var(--image) center/cover no-repeat;box-shadow:var(--shadow)}.pain-card>span{position:relative;width:42px;height:42px;display:grid;place-items:center;border:1px solid rgba(240,216,157,.5);background:rgba(16,20,23,.45);color:var(--gold-light);font:700 18px Georgia,serif}.pain-card>div{position:relative}.pain-card h3{margin:0 0 6px;font:800 25px/1.2 "Songti SC","Songti TC","STSong",serif}.pain-card p{margin:0;color:rgba(255,255,255,.8);font-size:15px}.teacher-section{color:#fff;background:var(--dark)}.teacher-grid{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(320px,.75fr);gap:54px;align-items:center}.teacher-copy h2{max-width:700px;margin:0 0 18px;font:900 clamp(36px,4.8vw,58px)/1.17 "Songti SC","Songti TC","STSong",serif}.teacher-copy>p{max-width:720px;margin:0;color:rgba(255,255,255,.76);font-size:17px}.credential-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:26px}.credential-grid>div{padding:16px;border:1px solid rgba(255,255,255,.15);background:rgba(255,255,255,.06)}.credential-grid strong,.credential-grid span{display:block}.credential-grid strong{color:var(--gold-light);font-size:17px}.credential-grid span{margin-top:5px;color:rgba(255,255,255,.65);font-size:13px}.teacher-photo{margin:0;overflow:hidden;border:1px solid rgba(213,170,91,.42);box-shadow:var(--shadow);aspect-ratio:4/5;background:#252b2e}.teacher-photo img{width:100%;height:100%;object-fit:cover;object-position:58% center}.course-section{background:linear-gradient(180deg,#fff,var(--paper2))}.course-summary{margin-bottom:24px;padding:26px 28px;display:flex;align-items:center;justify-content:space-between;gap:26px;border-left:4px solid var(--gold);background:#fff;box-shadow:0 12px 32px rgba(16,20,23,.07)}.course-summary h3{margin:0 0 6px;font:800 27px/1.25 "Songti SC","Songti TC","STSong",serif}.course-summary p{max-width:720px;margin:0;color:var(--soft)}.course-summary .btn{flex:0 0 auto}.lesson-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.lesson{min-height:250px;padding:22px;border:1px solid rgba(178,130,49,.28);background:rgba(255,255,255,.92)}.lesson summary{display:grid;grid-template-columns:auto 1fr;gap:10px 12px;list-style:none;cursor:pointer}.lesson summary::-webkit-details-marker{display:none}.lesson summary>span{grid-row:1/3;color:var(--gold-dark);font:700 27px/1 Georgia,serif}.lesson summary strong{font:800 21px/1.25 "Songti SC","Songti TC","STSong",serif}.lesson summary small{width:max-content;padding:3px 7px;border:1px solid rgba(178,130,49,.35);color:var(--gold-dark);font-size:11px}.lesson p{margin:18px 0 0;color:var(--soft);font-size:15px}.media-section{background:#fff}.media-grid{display:grid;grid-template-columns:1fr 1.5fr;gap:20px;align-items:center}.media-grid figure{margin:0;overflow:hidden;border:1px solid var(--line);background:var(--paper2);box-shadow:var(--shadow)}.media-grid figure:first-child{aspect-ratio:1}.media-grid figure:last-child{aspect-ratio:16/9}.media-grid img{width:100%;height:100%;object-fit:cover}.media-action{text-align:center;margin-top:24px}.youtube-button{padding:11px 18px;border:1px solid var(--line);background:#fff;font-weight:800}.faq-section{background:var(--paper2)}.faq-list{max-width:860px;margin:auto;display:grid;gap:10px}.faq-list details{border:1px solid rgba(178,130,49,.24);background:#fff}.faq-list summary{padding:18px 22px;list-style:none;font-weight:800;cursor:pointer}.faq-list summary::-webkit-details-marker{display:none}.faq-list summary:after{content:"+";float:right;color:var(--gold-dark)}.faq-list details[open] summary:after{content:"−"}.faq-list p{margin:0;padding:0 22px 20px;color:var(--soft)}.final-cta{color:#fff;background:linear-gradient(100deg,rgba(16,20,23,.98),rgba(16,20,23,.82)),image-set(url("lecture-close-v2.webp") type("image/webp"));background-position:center;background-size:cover}.final-inner{min-height:340px;display:grid;grid-template-columns:1fr auto;gap:40px;align-items:center}.final-inner h2{max-width:700px;margin:0 0 12px;font:900 clamp(36px,4.8vw,56px)/1.15 "Songti SC","Songti TC","STSong",serif}.final-inner p{margin:0;color:rgba(255,255,255,.72);font-size:17px}.site-footer{padding:36px 0;color:rgba(255,255,255,.62);background:#0b0e10;font-size:13px}.footer-inner>p{max-width:1000px;margin:0}.footer-links{display:flex;gap:20px;margin:18px 0;color:var(--gold-light)}.floating-wa{position:fixed;right:16px;bottom:max(16px,env(safe-area-inset-bottom));z-index:70;width:54px;height:54px;display:grid;place-items:center;border:1px solid rgba(255,255,255,.5);border-radius:50%;background:#20b861;box-shadow:0 12px 28px rgba(15,111,62,.32);transition:opacity .2s,transform .2s}.floating-wa.is-hidden{opacity:0;transform:translateY(12px);pointer-events:none}.floating-wa .tooltip{position:absolute;right:62px;padding:6px 9px;border-radius:4px;background:#111;color:#fff;font-size:12px;white-space:nowrap;opacity:0;pointer-events:none}.floating-wa:hover .tooltip,.floating-wa:focus-visible .tooltip{opacity:1}
@media(max-width:980px){.nav-links>a:not(.btn){display:none}.hero{min-height:850px}.hero-inner{min-height:850px;padding-bottom:410px;align-items:flex-start}.hero-copy{max-width:100%}.hero-portrait{right:50%;transform:translateX(50%);width:min(92vw,500px);height:440px}.proof-bar{margin-top:0}.proof-grid{width:100%;grid-template-columns:repeat(2,1fr)}.proof-grid>div:nth-child(2n){border-right:0}.proof-grid>div:nth-child(-n+2){border-bottom:1px solid var(--line)}.pain-grid{grid-template-columns:repeat(2,1fr)}.pain-card{min-height:250px}.teacher-grid{grid-template-columns:1fr}.teacher-photo{max-width:520px;aspect-ratio:16/10}.lesson-grid{grid-template-columns:repeat(2,1fr)}.media-grid{grid-template-columns:1fr 1.4fr}.final-inner{grid-template-columns:1fr;padding:72px 0}}
@media(max-width:620px){html{scroll-padding-top:64px}body{font-size:16px}.container{width:min(100% - 28px,520px)}.nav{width:calc(100% - 24px);min-height:62px;gap:8px}.brand{gap:8px}.brand-mark{width:32px;height:32px;font-size:18px}.brand strong{font-size:15px}.brand small,.nav-links{display:none}.nav-tools{margin-left:auto;gap:7px}.language-switch button{width:30px;height:30px;font-size:13px}.youtube-link{width:38px;min-height:36px;padding:0;border-radius:18px}.youtube-link>span:last-child{display:none}.youtube-icon{width:22px;height:16px}.hero{min-height:auto;padding-bottom:18px;display:flex;flex-direction:column;background-image:linear-gradient(180deg,rgba(8,12,13,.95),rgba(10,14,16,.9)),image-set(url("hero-bg-v2-768.avif") type("image/avif"),url("hero-bg-v2-768.webp") type("image/webp"))}.hero-inner{order:1;min-height:0;padding:88px 0 0;display:block}.hero-proof{font-size:13px}.hero h1{font-size:52px}.hero h1 span{font-size:19px}.hero-subtitle{margin-bottom:20px;font-size:15px;line-height:1.68}.hero .btn{width:100%;min-height:50px}.cta-note{font-size:12px;line-height:1.55}.hero-portrait{order:2;position:relative;right:auto;transform:none;width:min(76vw,296px);height:auto;margin:18px auto 0}.hero-portrait img{width:100%;height:auto}.hero-watermarks span{font-size:90px}.hero-watermarks span:first-child{display:none}.proof-grid>div{min-height:84px;padding:14px}.proof-grid strong{font-size:15px}.proof-grid span{font-size:11px;line-height:1.4}.section{padding:56px 0}.section-head{margin-bottom:26px}.section-head h2{font-size:31px}.section-head p{font-size:16px}.pain-grid{gap:10px}.pain-card{min-height:190px;padding:14px}.pain-card>span{width:34px;height:34px;font-size:14px}.pain-card h3{font-size:19px}.pain-card p{font-size:13px;line-height:1.5}.teacher-copy h2{font-size:32px}.teacher-copy>p{font-size:15px}.credential-grid{gap:8px}.credential-grid>div{padding:12px}.credential-grid strong{font-size:15px}.credential-grid span{font-size:12px;line-height:1.5}.teacher-photo{aspect-ratio:16/10}.course-summary{padding:20px;display:block}.course-summary h3{font-size:23px}.course-summary p{font-size:14px}.course-summary .btn{width:100%;margin-top:18px}.lesson-grid{grid-template-columns:1fr;gap:8px}.lesson{min-height:0;padding:0}.lesson summary{padding:16px;grid-template-columns:38px 1fr auto;align-items:center}.lesson summary>span{grid-row:auto;font-size:22px}.lesson summary strong{font-size:18px}.lesson summary small{font-size:10px}.lesson p{margin:0;padding:0 16px 16px;font-size:14px}.media-grid{grid-template-columns:1fr;gap:12px}.media-grid figure:first-child{aspect-ratio:1}.media-action{margin-top:18px}.youtube-button{width:100%}.faq-list summary{padding:16px}.faq-list p{padding:0 16px 17px;font-size:14px}.final-inner{min-height:0;padding:58px 0;gap:22px}.final-inner h2{font-size:32px}.final-inner .btn{width:100%}.site-footer{padding-bottom:86px}.floating-wa{right:12px;width:52px;height:52px}.floating-wa .tooltip{display:none}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}
.legal-main{min-height:100vh;background:linear-gradient(#fff,var(--paper))}.legal-hero{padding:150px 0 64px;color:#fff;background:linear-gradient(115deg,rgba(8,12,13,.97),rgba(20,27,30,.82)),image-set(url("hero-bg-v2-1440.webp") type("image/webp"));background-position:center;background-size:cover}.legal-hero h1{margin:0 0 12px;font:900 clamp(44px,7vw,72px)/1.1 "Songti SC","Songti TC","STSong",serif}.legal-hero p{margin:0 0 12px;color:rgba(255,255,255,.78)}.legal-content{padding:64px 0 88px;display:grid;gap:14px}.legal-content section{padding:24px 28px;border:1px solid var(--line);background:#fff}.legal-content h2{margin:0 0 8px;font:800 24px/1.3 "Songti SC","Songti TC","STSong",serif}.legal-content p{margin:0;color:var(--soft)}.legal-tools{margin-left:auto}@media(max-width:620px){.legal-hero{padding:108px 0 44px}.legal-content{padding:40px 0 60px}.legal-content section{padding:20px}.legal-content h2{font-size:21px}}
.teacher-section .kicker{color:var(--gold-light)}.sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}
.not-found{min-height:100vh;padding:32px;display:grid;place-items:center;text-align:center;color:#fff;background:linear-gradient(120deg,#0b0e10,#1a2327)}.not-found>div{max-width:560px}.not-found .brand-mark{margin:0 auto 24px}.not-found h1{margin:0 0 12px;font:900 clamp(42px,8vw,68px)/1.1 "Songti SC","Songti TC","STSong",serif}.not-found p:not(.kicker){margin:0 0 26px;color:rgba(255,255,255,.72)}

/* v3: one readable type system with a restrained four-level scale. */
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","PingFang TC","Microsoft YaHei","Microsoft JhengHei","Noto Sans CJK SC","Noto Sans CJK TC",Arial,sans-serif;font-size:16px;line-height:1.7;letter-spacing:0}.brand strong,.hero h1,.section-head h2,.pain-card h3,.teacher-copy h2,.course-summary h3,.lesson summary strong,.final-inner h2,.legal-hero h1,.legal-content h2,.not-found h1{font-family:inherit;letter-spacing:0}.brand strong{font-size:18px;font-weight:700}.brand small{font-size:10px}.hero-proof,.kicker{font-size:12px}.hero h1{font-size:clamp(58px,7vw,82px);line-height:1.05;font-weight:700}.hero h1 span{font-family:inherit;font-size:clamp(24px,2.5vw,32px);font-weight:600;line-height:1.2;letter-spacing:0}.hero-subtitle{font-size:18px;line-height:1.68}.btn,.youtube-button{font-size:15px}.proof-grid strong{font-family:inherit;font-size:17px;font-weight:700}.proof-grid span{font-size:12px}.section-head h2,.teacher-copy h2,.final-inner h2{font-size:clamp(30px,3.5vw,44px);line-height:1.25;font-weight:700}.section-head p,.teacher-copy>p,.final-inner p{font-size:16px;line-height:1.7}.pain-card h3{font-size:21px;line-height:1.3;font-weight:700}.pain-card p{font-size:14px;line-height:1.6}.credential-grid strong{font-size:16px;font-weight:700}.credential-grid span{font-size:13px;line-height:1.55}.course-summary h3{font-size:24px;line-height:1.35;font-weight:700}.course-summary p{font-size:15px;line-height:1.65}.lesson summary strong{font-size:19px;line-height:1.35;font-weight:700}.lesson p{font-size:15px;line-height:1.65}.faq-list summary{font-size:16px}.faq-list p{font-size:15px;line-height:1.65}.legal-hero h1{font-size:clamp(38px,5vw,54px);line-height:1.2;font-weight:700}.legal-content h2{font-size:21px;line-height:1.35;font-weight:700}.not-found h1{font-size:clamp(38px,6vw,56px);line-height:1.2;font-weight:700}
@media(max-width:620px){.brand strong{font-size:15px}.hero h1{font-size:44px;line-height:1.08}.hero h1 span{font-size:18px}.hero-subtitle{font-size:15px}.section-head h2,.teacher-copy h2,.final-inner h2{font-size:28px;line-height:1.3}.section-head p,.teacher-copy>p,.final-inner p{font-size:15px}.pain-card h3{font-size:18px}.pain-card p{font-size:12px}.course-summary h3{font-size:21px}.lesson summary strong{font-size:17px}.lesson p,.faq-list p{font-size:14px}.legal-hero h1{font-size:38px}.legal-content h2{font-size:20px}}

/* v4: balanced Chinese headings prevent orphaned final characters. */
.section-head.center{max-width:980px}.section-head h2,.teacher-copy h2,.course-summary h3,.final-inner h2,.legal-hero h1{text-wrap:balance;word-break:normal;overflow-wrap:break-word}.section-head p,.course-summary p,.final-inner p{text-wrap:pretty}