/* =========================================================
   BeEasyRussian — Design System
   Brand: honey/brown/cream, Unbounded + Nunito, bee theme
   ========================================================= */
:root{
  --honey:#F5A623;          /* primary */
  --honey-dark:#d98e12;
  --beeswax:#F5C842;        /* accent */
  --ink:#3D1C02;            /* text */
  --ink-soft:rgba(61,28,2,.70);
  --cream:#FFF9E6;          /* background */
  --wing:#DFF4FF;           /* light blue */
  --green:#5cb85c;
  --white:#fff;
  --line:rgba(61,28,2,.12);
  --shadow:0 18px 40px -20px rgba(61,28,2,.45);
  --radius:22px;
  --radius-sm:14px;
  --hex:polygon(25% 0%,75% 0%,100% 50%,75% 100%,25% 100%,0% 50%);
  --maxw:1200px;
  --font-head:'Unbounded',system-ui,sans-serif;
  --font-body:'Nunito',system-ui,sans-serif;
}

/* ---- reset ---- */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font-body);color:var(--ink);background:var(--cream);line-height:1.6;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
h1,h2,h3,h4{font-family:var(--font-head);font-weight:800;line-height:1.12}
:focus-visible{outline:3px solid var(--ink);outline-offset:3px;border-radius:6px}

.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.honey{color:var(--honey)}
.hexbg{position:absolute;inset:0;z-index:0;pointer-events:none;opacity:.4;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='56' height='100' viewBox='0 0 56 100'%3E%3Cpath d='M28 0L56 16v32L28 64 0 48V16z' fill='none' stroke='%23F5C842' stroke-width='1.4'/%3E%3Cpath d='M28 64L56 80v32M28 64L0 80v32' fill='none' stroke='%23F5C842' stroke-width='1.4'/%3E%3C/svg%3E");background-size:56px 96px}

/* ---- buttons ---- */
.btn{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-body);font-weight:800;font-size:1rem;
  padding:13px 26px;border-radius:50px;border:none;cursor:pointer;transition:transform .2s,box-shadow .2s,background .2s,color .2s}
.btn-primary{background:var(--honey);color:#fff;box-shadow:0 6px 0 var(--honey-dark)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 9px 0 var(--honey-dark)}
.btn-primary:active{transform:translateY(2px);box-shadow:0 2px 0 var(--honey-dark)}
.btn-secondary{background:var(--ink);color:var(--cream);box-shadow:0 6px 0 #1f0e00}
.btn-secondary:hover{transform:translateY(-3px);box-shadow:0 9px 0 #1f0e00}
.btn-ghost{background:transparent;color:var(--ink);border:2px solid var(--honey)}
.btn-ghost:hover{background:var(--honey);color:#fff}

/* ---- badges / tags ---- */
.badge{display:inline-block;font-family:var(--font-body);font-weight:800;font-size:.78rem;letter-spacing:.4px;
  padding:5px 13px;border-radius:50px;background:var(--cream);color:var(--ink);border:1.5px solid var(--honey)}
.badge--level{background:var(--honey);color:#fff;border-color:var(--honey)}
.badge--new{background:var(--green);color:#fff;border-color:var(--green)}
.badge--soon{background:transparent;color:var(--ink-soft);border-color:var(--line)}
.badge--lang{background:var(--wing);color:var(--ink);border-color:#bfe3f5}

/* ---- header / nav ---- */
.site-header{position:sticky;top:0;z-index:1000;background:var(--honey)}
.nav{display:flex;align-items:center;justify-content:space-between;height:74px}
.brand{display:flex;align-items:center;gap:9px;color:var(--ink);font-family:var(--font-head);font-size:1.2rem;line-height:1.05}
.brand img{width:40px;height:40px;object-fit:contain}
.brand b{font-weight:800}.brand span{font-weight:400;font-family:var(--font-body);font-weight:700}
.nav-links{display:flex;align-items:center;gap:22px}
.nav-links a{font-weight:800;color:var(--ink);padding:6px 2px;position:relative}
.nav-links a:hover,.nav-links a[aria-current="page"]{color:#fff}
.nav-links a[aria-current="page"]::after{content:"";position:absolute;left:0;right:0;bottom:-4px;height:3px;background:#fff;border-radius:3px}
.nav-cta{margin-left:6px}
.nav-toggle{display:none;background:none;border:none;color:var(--ink);font-size:1.7rem;cursor:pointer;line-height:1}

/* ---- hero ---- */
.hero{position:relative;overflow:hidden;padding:64px 0 78px}
.hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center}
.hero h1{font-size:clamp(2.4rem,5.5vw,4rem)}
.hero .lead{font-size:1.2rem;color:var(--ink-soft);font-weight:700;margin:18px 0 30px;max-width:34ch}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-art{display:flex;justify-content:center}
.hero-art img{width:min(420px,90%);filter:drop-shadow(0 22px 30px rgba(245,166,35,.45));animation:float 4s ease-in-out infinite}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-15px)}}

/* ---- generic section + page head ---- */
.section{padding:70px 0;position:relative}
.section--cream{background:var(--cream)}
.section--white{background:#fff}
.section-head{text-align:center;max-width:680px;margin:0 auto 46px;position:relative;z-index:1}
.section-head h2{font-size:clamp(1.9rem,4vw,2.7rem)}
.section-head p{color:var(--ink-soft);font-weight:700;font-size:1.08rem;margin-top:10px}
.page-head{position:relative;overflow:hidden;padding:52px 0 38px;background:var(--cream)}
.page-head h1{font-size:clamp(2rem,4.5vw,3rem);position:relative;z-index:1}
.page-head p{color:var(--ink-soft);font-weight:700;font-size:1.1rem;margin-top:8px;position:relative;z-index:1}

/* ---- cards ---- */
.cards{display:grid;gap:24px;position:relative;z-index:1}
.cards--2{grid-template-columns:repeat(2,1fr)}
.cards--3{grid-template-columns:repeat(3,1fr)}
.cards--4{grid-template-columns:repeat(4,1fr)}
.card{display:flex;flex-direction:column;background:#fff;border:2px solid var(--honey);border-radius:var(--radius);
  padding:28px 24px;transition:transform .25s,box-shadow .25s}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.card .card-ic{width:88px;height:88px;background:var(--cream);clip-path:var(--hex);display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.card .card-ic img{width:74%;height:74%;object-fit:contain}
.card .card-ic.letter{font-family:var(--font-head);font-weight:800;font-size:2.2rem;color:var(--honey)}
.card-tags{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:10px}
.card h3{font-size:1.2rem;margin-bottom:8px}
.card p{color:var(--ink-soft);font-weight:600;font-size:.96rem;flex:1}
.card .card-link{margin-top:16px;font-weight:800;color:var(--honey);display:inline-flex;gap:6px;align-items:center}
.card.is-soon{opacity:.6;border-style:dashed}
.card.is-soon:hover{transform:none;box-shadow:none}

/* ---- features (benefits) ---- */
.feature{text-align:center}.feature .card-ic{margin:0 auto 14px}

/* ---- breadcrumbs ---- */
.breadcrumbs{padding:16px 0 0}
.breadcrumbs ol{display:flex;flex-wrap:wrap;gap:6px;font-size:.9rem;font-weight:700;color:var(--ink-soft)}
.breadcrumbs li{display:flex;align-items:center;gap:6px}
.breadcrumbs li+li::before{content:"›";color:var(--honey)}
.breadcrumbs a:hover{color:var(--honey)}
.breadcrumbs [aria-current="page"]{color:var(--ink)}

/* ---- lesson layout (sidebar + main) ---- */
.lesson-wrap{display:grid;grid-template-columns:280px 1fr;gap:34px;padding:26px 0 70px;position:relative}
.sidebar{position:sticky;top:90px;align-self:start;background:#fff;border:2px solid var(--line);border-radius:var(--radius);padding:18px;max-height:calc(100vh - 110px);overflow:auto}
.sidebar h4{font-size:.85rem;text-transform:uppercase;letter-spacing:1px;color:var(--ink-soft);margin-bottom:12px}
.sidebar ul{display:flex;flex-direction:column;gap:4px}
.sidebar a{display:block;padding:10px 12px;border-radius:10px;font-weight:700;font-size:.95rem;color:var(--ink)}
.sidebar a:hover{background:var(--cream);color:var(--honey)}
.sidebar a[aria-current="page"]{background:var(--honey);color:#fff}
.sidebar-toggle{display:none}

.lesson-main{min-width:0}
.lesson-title{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin:6px 0 6px}
.lesson-title h1{font-size:clamp(1.8rem,3.5vw,2.4rem)}
.lesson-title .en{font-family:var(--font-body);font-weight:700;color:var(--ink-soft);font-size:1.05rem}
.lesson-block{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;margin:22px 0}
.lesson-block h2{font-size:1.4rem;margin-bottom:12px}
.lesson-block p{color:var(--ink-soft);font-weight:600;margin-bottom:12px}
.task{background:var(--cream);border:1.5px dashed var(--honey);border-radius:var(--radius-sm);padding:18px;margin:14px 0;font-weight:700}
.task .badge{margin-bottom:8px}

/* need help cross-links */
.needhelp{background:var(--wing);border-radius:var(--radius);padding:22px;margin:22px 0}
.needhelp h3{font-size:1.15rem;margin-bottom:10px}
.needhelp .links{display:flex;gap:10px;flex-wrap:wrap}
.needhelp .links a{background:#fff;border:1.5px solid #bfe3f5;border-radius:50px;padding:8px 16px;font-weight:800;font-size:.9rem}
.needhelp .links a:hover{border-color:var(--honey);color:var(--honey)}

/* prev / next */
.lesson-nav{display:flex;justify-content:space-between;gap:14px;margin-top:26px}
.lesson-nav a{flex:1;background:#fff;border:2px solid var(--line);border-radius:var(--radius-sm);padding:16px 18px;transition:border-color .2s,transform .2s}
.lesson-nav a:hover{border-color:var(--honey);transform:translateY(-2px)}
.lesson-nav small{display:block;color:var(--ink-soft);font-weight:700;font-size:.8rem}
.lesson-nav b{font-weight:800}
.lesson-nav .next{text-align:right}

/* ---- grammar blocks ---- */
.grammar-block{margin-bottom:46px}
.grammar-block .block-head{display:flex;align-items:center;gap:14px;margin-bottom:20px}
.grammar-block .block-head .card-ic{margin:0;width:64px;height:64px}
.grammar-block .block-head h2{font-size:1.7rem}

/* ---- CTA band ---- */
.cta-band{background:var(--honey);text-align:center;padding:64px 24px;position:relative;overflow:hidden}
.cta-band .inner{position:relative;z-index:1;max-width:620px;margin:0 auto}
.cta-band img{width:120px;margin-bottom:6px;filter:drop-shadow(0 12px 18px rgba(61,28,2,.25))}
.cta-band h2{color:var(--ink);font-size:clamp(1.8rem,4.5vw,2.8rem)}
.cta-band p{color:var(--ink);font-weight:700;font-size:1.12rem;margin:10px 0 24px}

/* ---- contact form ---- */
.form{max-width:560px;margin:0 auto;display:grid;gap:14px}
.form label{font-weight:800;font-size:.92rem}
.form input,.form textarea{width:100%;font-family:var(--font-body);font-size:1rem;padding:13px 15px;border:2px solid var(--line);border-radius:var(--radius-sm);background:#fff;color:var(--ink)}
.form input:focus,.form textarea:focus{border-color:var(--honey);outline:none}
.form textarea{min-height:130px;resize:vertical}

/* ---- blog ---- */
.post-card .thumb{height:150px;border-radius:var(--radius-sm);background:linear-gradient(135deg,var(--beeswax),var(--honey));margin-bottom:16px;display:flex;align-items:center;justify-content:center;font-size:2.4rem}
.post-body{max-width:760px;margin:0 auto}
.post-body p{color:var(--ink-soft);font-weight:600;margin-bottom:16px}
.post-body h2{margin:24px 0 10px}

/* ---- footer ---- */
.site-footer{background:var(--ink);color:var(--cream);padding:48px 0 26px}
.footer-grid{display:flex;justify-content:space-between;flex-wrap:wrap;gap:26px;margin-bottom:30px}
.footer-grid .brand{color:var(--cream)}
.footer-cols{display:flex;gap:48px;flex-wrap:wrap}
.footer-cols h5{font-family:var(--font-head);font-size:.95rem;margin-bottom:12px}
.footer-cols ul{display:flex;flex-direction:column;gap:8px;font-weight:700}
.footer-cols a:hover{color:var(--beeswax)}
.copyright{text-align:center;border-top:1px solid rgba(255,249,230,.15);padding-top:20px;color:rgba(255,249,230,.6);font-size:.88rem}

/* ---- reveal ---- */
.reveal{opacity:0;transform:translateY(24px);transition:.7s}.reveal.in{opacity:1;transform:none}

/* ---- nav dropdowns (multi-level) ---- */
.nav-dd{position:relative}
.nav-dd>summary{list-style:none;cursor:pointer;font-weight:800;color:var(--ink);display:inline-flex;align-items:center;gap:5px;padding:6px 2px}
.nav-dd>summary::-webkit-details-marker{display:none}
.nav-dd>summary::after{content:"▾";font-size:.8em}
.nav-dd>summary:hover{color:#fff}
.nav-panel{position:absolute;top:calc(100% + 12px);left:0;min-width:308px;max-height:72vh;overflow:auto;background:#fff;
  border:2px solid var(--honey);border-radius:var(--radius-sm);padding:10px;box-shadow:var(--shadow);z-index:1001}
.nav-panel .nav-link{display:block;padding:9px 12px;border-radius:8px;font-weight:800;color:var(--ink)}
.nav-panel .nav-link:hover{background:var(--cream);color:var(--honey)}
.nav-acc{border-radius:10px}
.nav-acc>summary{list-style:none;cursor:pointer;padding:10px 12px;font-weight:800;color:var(--ink);border-radius:10px;display:flex;align-items:center;gap:6px}
.nav-acc>summary::-webkit-details-marker{display:none}
.nav-acc>summary::before{content:"▸";color:var(--honey);transition:.15s}
.nav-acc[open]>summary::before{transform:rotate(90deg)}
.nav-acc>summary:hover{background:var(--cream)}
.nav-acc-body{padding-left:12px;border-left:2px solid var(--beeswax);margin:2px 0 6px 14px}
.nav-leaf{display:block;padding:8px 12px;border-radius:8px;font-weight:600;font-size:.95rem;color:var(--ink)}
.nav-leaf:hover{background:var(--cream);color:var(--honey)}
.nav-leaf.soon{color:var(--ink-soft);pointer-events:none}

/* =========================================================
   RESPONSIVE — mobile-first breakpoints: 360 / 768 / 1200
   ========================================================= */
@media (max-width:1024px){
  .lesson-wrap{grid-template-columns:1fr}
  .sidebar{position:static;max-height:none}
  .sidebar-toggle{display:flex;align-items:center;justify-content:space-between;width:100%;background:#fff;border:2px solid var(--line);
    border-radius:var(--radius-sm);padding:12px 16px;font-weight:800;cursor:pointer;font-family:var(--font-body)}
  .sidebar .sidebar-body{display:none;margin-top:12px}
  .sidebar.is-open .sidebar-body{display:block}
}
@media (max-width:860px){
  .nav-toggle{display:block}
  .nav-links{position:fixed;inset:74px 0 auto 0;flex-direction:column;align-items:stretch;gap:6px;background:var(--honey);
    padding:18px 24px 26px;transform:translateY(-160%);transition:.3s;box-shadow:0 16px 30px -10px rgba(61,28,2,.4);max-height:calc(100vh - 74px);overflow:auto}
  .nav-links.is-open{transform:none}
  .nav-links a{padding:10px 2px}
  .nav-dd{width:100%}
  .nav-dd>summary{padding:10px 2px}
  .nav-dd .nav-panel{position:static;min-width:0;max-height:none;border:none;box-shadow:none;padding:6px 0;background:transparent}
  .nav-cta{margin:6px 0 0}
  .hero-grid{grid-template-columns:1fr;text-align:center}
  .hero .lead{margin-left:auto;margin-right:auto}
  .hero-actions{justify-content:center}
  .hero-art{order:-1}
  .cards--3,.cards--4{grid-template-columns:1fr 1fr}
  .footer-grid{flex-direction:column}
}
@media (max-width:560px){
  .container{padding:0 18px}
  .cards--2,.cards--3,.cards--4{grid-template-columns:1fr}
  .lesson-nav{flex-direction:column}
  .lesson-nav .next{text-align:left}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
}