/* ============================================
   ec-binance.com — EDU_05 Mentor Emerald Green
   ============================================ */
:root{
  --pri:#2eca7f;--pri-dark:#25a96b;--pri-light:#eafaf2;--pri-bg:#f5fdf9;
  --dark:#1a2332;--text:#5a6a7e;--text2:#8a9ab0;--bg:#fff;
  --green:#10b981;--red:#ef4444;--orange:#f59e0b;
  --gold:#f0b90b;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Noto Sans SC','PingFang SC','Microsoft YaHei',sans-serif;color:var(--dark);background:#fff;line-height:1.7;font-size:16px}
a{color:var(--pri);text-decoration:none;transition:color .2s}
a:hover{color:var(--pri-dark)}
.container{max-width:1120px;margin:0 auto;padding:0 24px}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:600;border-radius:10px;cursor:pointer;border:2px solid transparent;transition:all .25s;font-size:15px;padding:12px 28px;text-decoration:none;line-height:1.4}
.btn--pri{background:var(--pri);color:#fff;border-color:var(--pri);box-shadow:0 4px 14px rgba(46,202,127,.3)}
.btn--pri:hover{background:var(--pri-dark);border-color:var(--pri-dark);color:#fff;transform:translateY(-1px)}
.btn--outline{background:transparent;color:var(--pri);border-color:var(--pri)}
.btn--outline:hover{background:var(--pri);color:#fff}
.btn--white{background:#fff;color:var(--pri);border-color:#fff;box-shadow:0 4px 14px rgba(0,0,0,.1)}
.btn--white:hover{background:var(--pri-light);color:var(--pri-dark)}
.btn--outline-light{background:transparent;color:#fff;border-color:rgba(255,255,255,.4)}
.btn--outline-light:hover{background:rgba(255,255,255,.12);border-color:#fff;color:#fff}
.btn--sm{padding:8px 20px;font-size:13px}
.btn--lg{padding:14px 32px;font-size:16px}
.btn--full{width:100%}

/* Section */
.sec{padding:80px 0}
.sec--alt{background:var(--pri-bg)}
.sec-badge{display:inline-block;color:var(--pri);font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:2px;margin-bottom:8px}
.sec-title{font-size:30px;font-weight:800;color:var(--dark);margin-bottom:12px;line-height:1.3}
.sec-desc{font-size:15px;color:var(--text);max-width:560px;line-height:1.7}
.sec-center{text-align:center}
.sec-center .sec-desc{margin:0 auto}

/* ===== Header (Mentor: clean white, emerald accents) ===== */
.hdr{position:sticky;top:0;z-index:100;background:#fff;box-shadow:0 1px 0 rgba(0,0,0,.06);transition:box-shadow .3s}
.hdr.scrolled{box-shadow:0 2px 20px rgba(46,202,127,.1)}
.hdr__inner{display:flex;align-items:center;height:64px;gap:20px}
.hdr__brand{display:flex;align-items:center;gap:8px;font-weight:800;font-size:18px;color:var(--dark);flex-shrink:0}
.hdr__brand svg{width:28px;height:28px}
.hdr__nav{display:flex;gap:4px;margin-left:auto}
.hdr__nav a{font-size:14px;color:var(--text);font-weight:500;padding:8px 14px;border-radius:8px;transition:all .2s}
.hdr__nav a:hover{color:var(--pri);background:var(--pri-light)}
.lang-switch{display:flex;gap:3px}
.lang-switch a{font-size:11px;padding:3px 7px;border-radius:4px;color:var(--text2);font-weight:600;transition:all .15s}
.lang-switch a:hover,.lang-switch a.active{color:var(--pri);background:var(--pri-light)}
.hdr__cta{padding:8px 22px;background:var(--pri);color:#fff;border-radius:8px;font-size:13px;font-weight:700;white-space:nowrap;transition:all .2s;box-shadow:0 2px 8px rgba(46,202,127,.25)}
.hdr__cta:hover{background:var(--pri-dark);color:#fff}
.hdr__burger{display:none;background:none;border:none;color:var(--dark);cursor:pointer}
.hdr__burger svg{width:24px;height:24px}
@media(max-width:768px){.hdr__nav,.lang-switch{display:none}.hdr__burger{display:block}}

/* Mobile */
.mob{display:none;position:fixed;inset:0;background:rgba(255,255,255,.98);z-index:200;flex-direction:column;align-items:center;justify-content:center;gap:20px}
.mob--open{display:flex}
.mob__close{position:absolute;top:16px;right:16px;background:none;border:none;cursor:pointer;color:var(--dark)}
.mob__close svg{width:28px;height:28px}
.mob a{font-size:1.1rem;color:var(--dark);font-weight:500}
.mob a:hover{color:var(--pri)}
.mob__lang{display:flex;gap:8px;margin-top:12px}
.mob__lang a{font-size:.85rem;padding:6px 12px;border-radius:4px;color:var(--text)}
.mob__lang a.on{background:var(--pri-light);color:var(--pri)}

/* ===== Hero (Mentor: large image area with overlay gradient) ===== */
.hero{background:linear-gradient(135deg,#1a2332 0%,#1e3a2f 40%,#2eca7f 100%);color:#fff;padding:88px 0 72px;position:relative;overflow:hidden;text-align:center}
.hero::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E")}
.hero::after{content:'';position:absolute;bottom:-80px;right:-40px;width:320px;height:320px;background:radial-gradient(circle,rgba(46,202,127,.2),transparent 70%);border-radius:50%}
.hero .container{position:relative;z-index:1}
.hero__badge{display:inline-block;background:rgba(46,202,127,.25);color:#fff;font-size:12px;font-weight:600;padding:6px 18px;border-radius:50px;margin-bottom:22px;backdrop-filter:blur(4px);border:1px solid rgba(46,202,127,.3)}
.hero__title{font-size:clamp(30px,5vw,48px);font-weight:800;line-height:1.15;margin-bottom:18px}
.hero__desc{font-size:17px;opacity:.9;max-width:560px;margin:0 auto 36px;line-height:1.8}
.hero__btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero__img{margin-top:48px;max-width:680px;margin-left:auto;margin-right:auto;position:relative}
.hero__img-placeholder{width:100%;height:200px;background:rgba(255,255,255,.08);border-radius:16px;border:2px dashed rgba(255,255,255,.15);display:flex;align-items:center;justify-content:center}
.hero__img-placeholder span{font-size:14px;opacity:.5}

/* ===== About Section with list ===== */
.about-sec{padding:72px 0}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
@media(max-width:768px){.about-grid{grid-template-columns:1fr;gap:28px}}
.about-list{list-style:none;margin-top:20px}
.about-list li{display:flex;align-items:flex-start;gap:12px;padding:12px 0;border-bottom:1px solid #f0f3f7}
.about-list li:last-child{border-bottom:none}
.about-list__icon{width:36px;height:36px;min-width:36px;background:var(--pri-light);border-radius:10px;display:flex;align-items:center;justify-content:center;color:var(--pri)}
.about-list__text{font-size:14px;color:var(--text);line-height:1.6}
.about-list__text strong{color:var(--dark);font-weight:600}

/* ===== Stats Bar (Mentor: emerald bg) ===== */
.stats-bar{background:linear-gradient(135deg,#2eca7f,#25a96b);padding:52px 0;color:#fff}
.stats-bar__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
@media(max-width:600px){.stats-bar__grid{grid-template-columns:repeat(2,1fr);gap:20px}}
.stats-bar__num{font-size:42px;font-weight:800;line-height:1}
.stats-bar__label{font-size:14px;opacity:.8;margin-top:6px}

/* ===== Tag Cloud Features ===== */
.tag-sec{padding:64px 0;background:var(--pri-bg)}
.tag-cloud{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:28px}
.tag-cloud__item{display:inline-flex;align-items:center;gap:6px;background:#fff;border:1px solid #e0ebe5;padding:8px 18px;border-radius:50px;font-size:14px;color:var(--dark);font-weight:500;transition:all .25s;cursor:default}
.tag-cloud__item:hover{background:var(--pri);color:#fff;border-color:var(--pri);transform:translateY(-2px);box-shadow:0 4px 12px rgba(46,202,127,.2)}
.tag-cloud__item svg{width:16px;height:16px;opacity:.6}

/* ===== 3-Col Course Cards with Price Badges ===== */
.course-sec{padding:80px 0}
.course-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;margin-top:44px}
@media(max-width:900px){.course-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.course-grid{grid-template-columns:1fr}}
.course-card{background:#fff;border-radius:16px;overflow:hidden;box-shadow:0 2px 20px rgba(0,0,0,.05);transition:all .3s;position:relative}
.course-card:hover{box-shadow:0 12px 36px rgba(46,202,127,.12);transform:translateY(-4px)}
.course-card__img{height:160px;background:linear-gradient(135deg,#1a2332 0%,#2a3a4a 100%);display:flex;align-items:center;justify-content:center;position:relative}
.course-card__img svg{width:48px;height:48px;color:rgba(255,255,255,.3)}
.course-card__badge{position:absolute;top:12px;right:12px;background:var(--pri);color:#fff;font-size:12px;font-weight:700;padding:4px 14px;border-radius:20px}
.course-card__badge--gold{background:var(--gold);color:#1a2332}
.course-card__badge--free{background:var(--green)}
.course-card__body{padding:24px}
.course-card__cat{font-size:12px;color:var(--pri);font-weight:600;text-transform:uppercase;letter-spacing:1px;margin-bottom:8px}
.course-card__title{font-size:17px;font-weight:700;color:var(--dark);margin-bottom:8px;line-height:1.4}
.course-card__desc{font-size:14px;color:var(--text);line-height:1.6;margin-bottom:16px}
.course-card__footer{display:flex;align-items:center;justify-content:space-between;padding-top:16px;border-top:1px solid #f0f3f7}
.course-card__price{font-size:18px;font-weight:800;color:var(--pri)}
.course-card__price span{font-size:12px;color:var(--text2);font-weight:400;text-decoration:line-through;margin-left:6px}
.course-card__link{font-size:13px;color:var(--pri);font-weight:600}

/* ===== Team Member Cards ===== */
.team-sec{padding:72px 0;background:var(--pri-bg)}
.team-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;margin-top:40px}
@media(max-width:768px){.team-grid{grid-template-columns:1fr;gap:20px}}
.team-card{background:#fff;border-radius:16px;padding:36px 28px;text-align:center;box-shadow:0 2px 16px rgba(0,0,0,.04);transition:all .3s}
.team-card:hover{box-shadow:0 8px 28px rgba(46,202,127,.1);transform:translateY(-3px)}
.team-card__avatar{width:80px;height:80px;border-radius:50%;background:linear-gradient(135deg,var(--pri),var(--pri-dark));display:flex;align-items:center;justify-content:center;margin:0 auto 16px;color:#fff;font-size:28px;font-weight:800}
.team-card__name{font-size:18px;font-weight:700;color:var(--dark);margin-bottom:4px}
.team-card__role{font-size:13px;color:var(--pri);font-weight:600;margin-bottom:12px}
.team-card__desc{font-size:14px;color:var(--text);line-height:1.7}

/* ===== FAQ Accordion ===== */
.faq-sec{padding:72px 0}
.faq-list{display:flex;flex-direction:column;gap:10px;max-width:760px;margin:36px auto 0}
.faq-item{background:#fff;border-radius:12px;box-shadow:0 2px 12px rgba(0,0,0,.04);overflow:hidden;border:1px solid #f0f0f0}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;padding:18px 22px;background:none;border:none;cursor:pointer;font-size:15px;font-weight:600;color:var(--dark);text-align:left;gap:12px}
.faq-q svg{flex-shrink:0;color:var(--pri);transition:transform .3s}
.faq-item.open .faq-q{color:var(--pri)}
.faq-item.open .faq-q svg{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-item.open .faq-a{max-height:300px}
.faq-a p{padding:0 22px 18px;font-size:14px;color:var(--text);line-height:1.8}

/* ===== CTA Section ===== */
.cta-sec{background:linear-gradient(135deg,#1a2332,#1e3a2f);padding:80px 0;color:#fff;text-align:center}
.cta-sec h2{font-size:32px;font-weight:800;margin-bottom:14px}
.cta-sec p{color:rgba(255,255,255,.7);max-width:480px;margin:0 auto 32px;font-size:16px;line-height:1.7}
.cta-sec__btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.cta-sec__offer{display:inline-flex;align-items:center;gap:8px;background:rgba(46,202,127,.2);color:#2eca7f;padding:8px 20px;border-radius:50px;font-size:14px;font-weight:700;margin-bottom:24px;border:1px solid rgba(46,202,127,.3)}
.cta-sec__offer span{font-size:22px;font-weight:800;color:#fff}

/* ===== Footer (Mentor: dark, 4-col) ===== */
.ftr{background:#1a2332;color:#8a9ab0;padding:48px 0 24px}
.ftr__grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:32px}
@media(max-width:768px){.ftr__grid{grid-template-columns:1fr 1fr;gap:24px}}
@media(max-width:480px){.ftr__grid{grid-template-columns:1fr}}
.ftr__brand{font-size:18px;font-weight:800;color:#fff;margin-bottom:12px;display:flex;align-items:center;gap:8px}
.ftr__brand svg{width:24px;height:24px}
.ftr__desc{font-size:13px;line-height:1.7;color:#6a7a8e}
.ftr__col h4{font-size:14px;font-weight:700;color:#fff;margin-bottom:14px}
.ftr__col ul{list-style:none}
.ftr__col li{margin-bottom:8px}
.ftr__col a{color:#6a7a8e;font-size:13px;transition:color .2s}
.ftr__col a:hover{color:var(--pri)}
.ftr__lang{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px}
.ftr__lang a{display:inline-block;padding:4px 10px;font-size:12px;color:#6a7a8e;border:1px solid #2a3a4a;border-radius:6px;transition:all .2s}
.ftr__lang a:hover,.ftr__lang a.active{color:#fff;border-color:var(--pri);background:rgba(46,202,127,.15)}
.ftr__bottom{border-top:1px solid #2a3a4a;padding-top:20px;font-size:12px;color:#4a5a6e}
.ftr__risk{margin-bottom:8px;line-height:1.7}
.ftr__risk strong{color:#6a7a8e}

/* ===== Download Page ===== */
.dl-hero{background:linear-gradient(135deg,#1a2332 0%,#1e3a2f 40%,#2eca7f 100%);color:#fff;padding:80px 0 60px;text-align:center;position:relative;overflow:hidden}
.dl-hero::before{content:'';position:absolute;top:-50px;right:-50px;width:220px;height:220px;border:3px solid rgba(46,202,127,.15);border-radius:50%}
.dl-hero::after{content:'';position:absolute;bottom:-40px;left:-20px;width:180px;height:180px;background:radial-gradient(circle,rgba(46,202,127,.15),transparent 70%);border-radius:50%}
.dl-hero .container{position:relative;z-index:1}
.dl-hero h1{font-size:clamp(26px,4.5vw,40px);font-weight:800;margin-bottom:14px}
.dl-hero p{font-size:16px;opacity:.9;max-width:500px;margin:0 auto 32px;line-height:1.8}
.dl-hero__btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:36px}
.dl-hero__stats{display:flex;gap:48px;justify-content:center;flex-wrap:wrap}
.dl-hero__stat{text-align:center}
.dl-hero__stat-num{font-size:28px;font-weight:800;line-height:1}
.dl-hero__stat-label{font-size:12px;opacity:.75;margin-top:4px}
.dl-grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;max-width:940px;margin:0 auto;padding:48px 24px}
@media(max-width:768px){.dl-grid3{grid-template-columns:1fr}}
.dl-card{background:#fff;border-radius:18px;padding:36px 28px;text-align:center;box-shadow:0 4px 24px rgba(0,0,0,.06);transition:all .3s;border-top:4px solid transparent}
.dl-card:hover{border-top-color:var(--pri);box-shadow:0 12px 36px rgba(46,202,127,.12);transform:translateY(-4px)}
.dl-card__icon{width:72px;height:72px;border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 20px;color:#fff}
.dl-card__icon--android{background:linear-gradient(135deg,#2eca7f,#25a96b)}
.dl-card__icon--ios{background:linear-gradient(135deg,#1a2332,#2a3a4a)}
.dl-card__icon--desktop{background:linear-gradient(135deg,#f0b90b,#d4a20a)}
.dl-card h2{font-size:20px;font-weight:700;color:var(--dark);margin-bottom:10px}
.dl-card p{font-size:14px;color:var(--text);margin-bottom:18px;line-height:1.6}
.dl-card ul{list-style:none;text-align:left;margin-bottom:24px;padding:0}
.dl-card li{display:flex;align-items:center;gap:8px;padding:8px 0;font-size:14px;color:var(--dark);border-bottom:1px solid #f5f5f5}
.dl-card li:last-child{border-bottom:none}
.dl-card li svg{width:16px;height:16px;color:var(--pri);flex-shrink:0}
.dl-steps{padding:64px 0;background:var(--pri-bg)}
.dl-steps__title{text-align:center;font-size:26px;font-weight:800;color:var(--dark);margin-bottom:40px}
.dl-timeline{max-width:640px;margin:0 auto;position:relative;padding-left:40px}
.dl-timeline::before{content:'';position:absolute;left:15px;top:0;bottom:0;width:2px;background:linear-gradient(180deg,var(--pri),#25a96b)}
.dl-timeline__item{position:relative;padding-bottom:36px}
.dl-timeline__item:last-child{padding-bottom:0}
.dl-timeline__dot{position:absolute;left:-33px;top:2px;width:28px;height:28px;background:var(--pri);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:800;box-shadow:0 3px 10px rgba(46,202,127,.3)}
.dl-timeline__title{font-size:17px;font-weight:700;color:var(--dark);margin-bottom:6px}
.dl-timeline__desc{font-size:14px;color:var(--text);line-height:1.7}
.dl-timeline__desc a{color:var(--pri);font-weight:600}
.dl-faq{padding:64px 0}
.dl-faq__grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;max-width:800px;margin:36px auto 0}
@media(max-width:768px){.dl-faq__grid{grid-template-columns:1fr}}
.dl-faq__card{background:#fff;border-radius:14px;padding:24px;box-shadow:0 2px 16px rgba(0,0,0,.04);border-left:4px solid var(--pri)}
.dl-faq__card h3{font-size:15px;font-weight:700;color:var(--dark);margin-bottom:8px}
.dl-faq__card p{font-size:13px;color:var(--text);line-height:1.7}
.dl-cta{background:var(--dark);color:#fff;padding:64px 0;text-align:center}
.dl-cta h2{font-size:28px;font-weight:800;margin-bottom:12px}
.dl-cta p{color:var(--text2);max-width:440px;margin:0 auto 28px;font-size:15px;line-height:1.7}
.dl-cta__btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* Page */
.page-content{padding:48px 0 60px}
.page-content h1{font-size:28px;font-weight:800;margin-bottom:20px;color:var(--dark)}
.page-content h2{font-size:20px;font-weight:700;margin:28px 0 12px;color:var(--dark)}
.page-content p{color:var(--text);line-height:1.85;margin-bottom:14px}

/* Back to top */
.back-top{position:fixed;bottom:24px;right:24px;width:40px;height:40px;background:var(--pri);color:#fff;border:none;border-radius:50%;cursor:pointer;opacity:0;transform:translateY(10px);transition:all .3s;box-shadow:0 2px 10px rgba(46,202,127,.3);z-index:50;display:flex;align-items:center;justify-content:center}
.back-top--show{opacity:1;transform:translateY(0)}
.back-top svg{width:20px;height:20px}