/* ===== История на България · стилове ===== */
:root{
  --bg:#f6f1e7;            /* пергамент */
  --bg-soft:#fbf8f1;
  --ink:#2a2420;
  --ink-soft:#6b5f52;
  --line:#e2d7c3;
  --card:#ffffff;
  --accent:#0f7a3d;       /* зелено */
  --accent-2:#c0392b;     /* червено */
  --gold:#b8860b;
  --ok:#1e8e4e;
  --bad:#c0392b;
  --shadow:0 6px 22px rgba(60,45,25,.10);
  --shadow-sm:0 2px 8px rgba(60,45,25,.08);
  --radius:16px;
  --radius-sm:10px;
  --maxw:1080px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:"Inter",system-ui,Segoe UI,Roboto,sans-serif;
  color:var(--ink);
  background:
    radial-gradient(1200px 500px at 110% -10%, #efe6d2 0, transparent 60%),
    var(--bg);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,.brand-text strong{font-family:"Lora",Georgia,serif}
.muted{color:var(--ink-soft);font-size:.95rem}
.section-title{font-size:1.5rem;margin:.2em 0 .6em;letter-spacing:.2px}

/* ===== Лента горе ===== */
.topbar{
  position:sticky;top:0;z-index:40;
  display:flex;align-items:center;gap:18px;
  padding:12px clamp(14px,4vw,34px);
  background:rgba(251,248,241,.86);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:11px;cursor:pointer}
.brand-mark{
  font-size:1.5rem;width:40px;height:40px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--accent),#0a5e2e);color:#fff;border-radius:11px;
  box-shadow:var(--shadow-sm)
}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.brand-text strong{font-size:1.05rem}
.brand-text small{color:var(--ink-soft);font-size:.72rem}
.mainnav{display:flex;gap:4px;margin-left:auto;flex-wrap:wrap}
.navbtn{
  font:inherit;font-weight:600;font-size:.92rem;
  border:none;background:transparent;color:var(--ink-soft);
  padding:9px 14px;border-radius:10px;cursor:pointer;transition:.15s;
}
.navbtn:hover{background:#efe7d6;color:var(--ink)}
.navbtn.active{background:var(--ink);color:#fff}
.menu-toggle{display:none;margin-left:auto;font-size:1.4rem;background:none;border:none;cursor:pointer;color:var(--ink)}

/* ===== Изгледи ===== */
main{max-width:var(--maxw);margin:0 auto;padding:clamp(18px,4vw,40px) clamp(14px,4vw,30px) 60px}
.view{display:none;animation:fade .35s ease}
.view.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* ===== Hero ===== */
.hero{
  background:linear-gradient(135deg,#ffffff, #fbf6ea);
  border:1px solid var(--line);border-radius:var(--radius);
  padding:clamp(22px,4vw,40px);box-shadow:var(--shadow);margin-bottom:30px;
  position:relative;overflow:hidden;
}
.hero::after{content:"";position:absolute;right:-40px;top:-40px;width:220px;height:220px;
  background:radial-gradient(circle,rgba(184,134,11,.16),transparent 70%);}
.hero h1{font-size:clamp(2rem,5vw,3rem);margin:0 0 .2em;background:linear-gradient(90deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{font-size:1.12rem;max-width:62ch;color:#473d33}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:18px 0 6px}
.stat-row{display:flex;gap:24px;flex-wrap:wrap;margin-top:20px;padding-top:18px;border-top:1px dashed var(--line)}
.stat{display:flex;flex-direction:column}
.stat b{font-size:1.7rem;font-family:"Lora",serif;color:var(--ink)}
.stat span{font-size:.8rem;color:var(--ink-soft)}

/* ===== Бутони ===== */
.btn{font:inherit;font-weight:600;border-radius:11px;padding:11px 20px;cursor:pointer;border:1px solid transparent;transition:.15s;font-size:.95rem}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:#0a5e2e;transform:translateY(-1px)}
.btn-ghost{background:transparent;border-color:var(--ink);color:var(--ink)}
.btn-ghost:hover{background:var(--ink);color:#fff}
.btn-sm{padding:8px 14px;font-size:.86rem;border-radius:9px}
.btn:disabled{opacity:.45;cursor:not-allowed}

/* ===== Епохи (начало) ===== */
.era-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px}
.era-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px;box-shadow:var(--shadow-sm);cursor:pointer;transition:.18s;position:relative;overflow:hidden
}
.era-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.era-card .bar{height:6px;border-radius:6px;margin:-4px -4px 14px}
.era-card .num{font-size:.74rem;font-weight:700;color:var(--ink-soft);letter-spacing:1px;text-transform:uppercase}
.era-card h3{margin:.25em 0 .35em;font-size:1.12rem}
.era-card .meta{display:flex;justify-content:space-between;align-items:center;font-size:.82rem;color:var(--ink-soft);margin-top:10px}
.era-card .count{background:#f0e9da;border-radius:20px;padding:3px 10px;font-weight:600}

/* ===== Филтри ===== */
.filter-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px}
.chip{font:inherit;font-size:.86rem;font-weight:600;border:1px solid var(--line);background:var(--bg-soft);
  color:var(--ink-soft);padding:7px 13px;border-radius:20px;cursor:pointer;transition:.15s;white-space:nowrap}
.chip:hover{border-color:var(--accent);color:var(--ink)}
.chip.active{background:var(--ink);color:#fff;border-color:var(--ink)}

/* ===== Списък с уроци ===== */
.lesson-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:14px}
.lesson-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:16px 18px;box-shadow:var(--shadow-sm);cursor:pointer;transition:.16s;border-left:4px solid var(--accent)}
.lesson-card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.lesson-card .ribbon{display:flex;align-items:center;gap:8px;margin-bottom:6px}
.lesson-card .rn{font-family:"Lora",serif;font-weight:700;color:var(--gold);font-size:.95rem;min-width:34px}
.lesson-card .etag{font-size:.7rem;text-transform:uppercase;letter-spacing:.5px;color:var(--ink-soft)}
.lesson-card h3{font-size:1.04rem;margin:.1em 0 .3em}
.lesson-card ul{margin:.4em 0 0;padding-left:1.1em;color:#4b4138;font-size:.9rem}
.lesson-card li{margin:.18em 0}
.lesson-card li:nth-child(n+3){display:none}
.lesson-card .more{font-size:.8rem;color:var(--accent);font-weight:600;margin-top:8px;display:inline-block}

/* ===== Модал за урок ===== */
.modal-backdrop{position:fixed;inset:0;background:rgba(40,30,18,.5);backdrop-filter:blur(3px);
  display:none;align-items:center;justify-content:center;z-index:60;padding:18px}
.modal-backdrop.open{display:flex;animation:fade .2s}
.modal{background:var(--bg-soft);border-radius:var(--radius);max-width:640px;width:100%;max-height:86vh;
  overflow:auto;box-shadow:0 24px 60px rgba(0,0,0,.3);border:1px solid var(--line)}
.modal-head{position:sticky;top:0;background:var(--bg-soft);padding:20px 24px 12px;border-bottom:1px solid var(--line)}
.modal-head .rn{font-family:"Lora",serif;color:var(--gold);font-weight:700}
.modal-head h2{margin:.1em 0 .2em;font-size:1.4rem}
.modal-head .etag{font-size:.78rem;color:var(--ink-soft)}
.modal-close{position:absolute;right:16px;top:16px;background:#efe7d6;border:none;width:34px;height:34px;border-radius:50%;font-size:1.1rem;cursor:pointer}
.modal-body{padding:18px 24px 26px}
.modal-body h4{margin:.6em 0 .3em;color:var(--ink-soft);font-size:.8rem;text-transform:uppercase;letter-spacing:.6px}
.modal-body ul{padding-left:1.2em}
.modal-body li{margin:.4em 0}
.modal-foot{display:flex;gap:10px;flex-wrap:wrap;padding:0 24px 22px}

/* ===== Флашкарти ===== */
.flash-stage{max-width:560px;margin:0 auto}
.flashcard{perspective:1400px;height:300px;margin-bottom:16px}
.flashcard-inner{position:relative;width:100%;height:100%;transition:transform .55s;transform-style:preserve-3d;cursor:pointer}
.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}
.flash-face{position:absolute;inset:0;backface-visibility:hidden;border-radius:var(--radius);
  display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;
  padding:28px;box-shadow:var(--shadow);border:1px solid var(--line)}
.flash-front{background:linear-gradient(135deg,#fff,#fbf4e6)}
.flash-back{background:linear-gradient(135deg,#0f7a3d,#0a5e2e);color:#fff;transform:rotateY(180deg)}
.flash-face .tag{font-size:.72rem;text-transform:uppercase;letter-spacing:1px;opacity:.7;margin-bottom:10px}
.flash-face .q{font-family:"Lora",serif;font-size:1.3rem;line-height:1.4}
.flash-face .a{font-size:1.12rem;line-height:1.45}
.flash-hint{font-size:.74rem;opacity:.6;margin-top:14px}
.flash-controls{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:6px}
.flash-know{display:flex;gap:8px}
.flash-progress{font-size:.85rem;color:var(--ink-soft);text-align:center;margin-top:10px}
.know-yes{background:var(--ok);color:#fff;border:none}
.know-no{background:#f3e3df;color:var(--bad);border:1px solid #e6c9c2}

/* ===== ИИ обяснение ===== */
.ai-row{display:flex;justify-content:center;margin-top:16px}
.ai-btn{background:linear-gradient(135deg,#6a3fb5,#8e5bd0);color:#fff;border:none;font-weight:600}
.ai-btn:hover{filter:brightness(1.07);transform:translateY(-1px)}
.ai-btn:disabled{opacity:.7;cursor:wait}
.ai-panel{display:none;margin-top:14px;background:var(--card);border:1px solid #e3d8f0;border-left:4px solid #8e5bd0;
  border-radius:12px;padding:16px 18px;box-shadow:var(--shadow-sm);text-align:left;animation:fade .3s}
.ai-panel.show{display:block}
.ai-head{font-weight:700;color:#6a3fb5;font-size:.92rem;margin-bottom:8px}
.ai-panel p{margin:.5em 0;font-size:.95rem;line-height:1.62;color:#3c352e}
.ai-panel ul{margin:.4em 0;padding-left:1.2em}
.ai-panel li{margin:.3em 0;font-size:.93rem;line-height:1.5}
.ai-foot{margin-top:12px;padding-top:8px;border-top:1px dashed var(--line);font-size:.74rem;color:var(--ink-soft)}
.ai-loading{display:flex;align-items:center;gap:10px;color:#6a3fb5;font-weight:600;font-size:.92rem}
.ai-spin{width:16px;height:16px;border:2px solid #d9c8ef;border-top-color:#8e5bd0;border-radius:50%;display:inline-block;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.ai-error{color:var(--bad);font-size:.9rem;line-height:1.5}
.ai-error code{background:#f0e9da;padding:1px 6px;border-radius:5px;font-size:.85em}

/* ===== Тест / Изпит ===== */
.quiz-stage,.exam-stage{max-width:680px;margin:0 auto}
.q-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow-sm);margin-bottom:16px}
.q-meta{display:flex;justify-content:space-between;font-size:.78rem;color:var(--ink-soft);margin-bottom:8px}
.q-text{font-family:"Lora",serif;font-size:1.2rem;margin-bottom:16px}
.opts{display:flex;flex-direction:column;gap:10px}
.opt{font:inherit;text-align:left;background:var(--bg-soft);border:1.5px solid var(--line);border-radius:11px;
  padding:13px 16px;cursor:pointer;transition:.14s;font-size:.97rem;display:flex;gap:10px;align-items:flex-start}
.opt:hover{border-color:var(--accent);background:#fff}
.opt .lt{font-weight:700;color:var(--ink-soft);min-width:18px}
.opt.correct{background:#e6f5ec;border-color:var(--ok);color:#0c5c2f}
.opt.wrong{background:#fae9e6;border-color:var(--bad);color:#8c241a}
.opt.disabled{pointer-events:none}
.q-explain{margin-top:14px;padding:12px 14px;background:#fffdf6;border:1px dashed var(--gold);border-radius:10px;font-size:.9rem;display:none}
.q-explain.show{display:block}
.q-explain b{color:var(--gold)}
.progressbar{height:8px;background:#e9e0cf;border-radius:6px;overflow:hidden;margin-bottom:18px}
.progressbar > i{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--gold));transition:width .3s}

/* настройки на изпит */
.setup{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm);text-align:center}
.setup h3{margin-top:0}
.setup .options-grid{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin:16px 0}
.setup .num-pick{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}

/* резултат */
.result{text-align:center;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:30px;box-shadow:var(--shadow)}
.score-ring{width:150px;height:150px;border-radius:50%;margin:6px auto 14px;display:grid;place-items:center;
  background:conic-gradient(var(--accent) var(--p,0%), #e9e0cf 0);position:relative}
.score-ring::before{content:"";position:absolute;inset:12px;background:var(--card);border-radius:50%}
.score-ring span{position:relative;font-family:"Lora",serif;font-size:2rem;font-weight:700}
.grade{font-size:1.05rem;font-weight:600;margin:.2em 0 1em}
.review{text-align:left;margin-top:22px}
.review h4{margin-bottom:8px}
.rev-item{padding:10px 12px;border-radius:9px;margin-bottom:8px;font-size:.9rem;border:1px solid var(--line)}
.rev-item.ok{background:#eef7f0;border-color:#bfe3cc}
.rev-item.no{background:#fbecea;border-color:#eccac3}
.rev-item .ri-q{font-weight:600;margin-bottom:3px}
.rev-item small{color:var(--ink-soft)}

.empty{text-align:center;color:var(--ink-soft);padding:40px 10px}
.pill{display:inline-block;background:#f0e9da;border-radius:20px;padding:2px 10px;font-size:.78rem;font-weight:600}

.footer{border-top:1px solid var(--line);text-align:center;padding:22px;color:var(--ink-soft);font-size:.82rem}

/* ===== Мобилно ===== */
@media (max-width:720px){
  .mainnav{position:fixed;top:62px;right:10px;left:10px;flex-direction:column;background:var(--bg-soft);
    border:1px solid var(--line);border-radius:14px;padding:8px;box-shadow:var(--shadow);display:none;z-index:50}
  .mainnav.open{display:flex}
  .menu-toggle{display:block}
  .navbtn{width:100%;text-align:left}
  .flashcard{height:340px}
}