/* ==========================================================
   DESIGN TOKENS
   paper   #FAF7EF  background
   ink     #26312C  primary text
   pine    #1F4B47  primary / headers / links
   pine-2  #163632  darker pine (hover)
   mustard #D9A441  accent (buttons, highlights)
   coral   #C1544A  used only for "incorrect" feedback
   sage    #C9D2C2  borders / dividers
   ========================================================== */
:root{
    --paper: #FAF7EF;
    --paper-2: #F1ECDF;
    --ink: #26312C;
    --ink-soft: #5B675F;
    --pine: #1F4B47;
    --pine-2: #163632;
    --mustard: #D9A441;
    --mustard-2: #B9852B;
    --coral: #C1544A;
    --sage: #C9D2C2;
    --white: #FFFFFF;

    --font-display: "Fraunces", Georgia, serif;
    --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-mono: "IBM Plex Mono", ui-monospace, monospace;

    --radius: 14px;
    --radius-sm: 8px;
    --shadow: 0 2px 10px rgba(31, 75, 71, 0.08), 0 1px 2px rgba(31,75,71,0.06);
}

@media (prefers-reduced-motion: reduce){
    *{ animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--font-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}
h1,h2,h3,h4{
    font-family: var(--font-display);
    color: var(--pine-2);
    line-height: 1.15;
    margin: 0 0 0.5em;
}
p{ margin: 0 0 1em; }
a{ color: var(--pine); text-decoration: none; }
a:hover{ color: var(--mustard-2); }
:focus-visible{
    outline: 3px solid var(--mustard);
    outline-offset: 2px;
    border-radius: 4px;
}

.wrap{
    max-width: 980px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------------- Header ---------------- */
.site-header{
    background: var(--paper);
    border-bottom: 1px solid var(--sage);
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(6px);
    background: rgba(250, 247, 239, 0.92);
}
.header-inner{
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
    gap: 20px;
}
.lang-toggle{
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    font-weight: 600;
    flex-shrink: 0;
}
.lang-toggle a{ color: var(--ink-soft); padding: 4px 2px; }
.lang-toggle a.active{ color: var(--pine-2); border-bottom: 2px solid var(--mustard); }
.lang-sep{ color: var(--sage); }
.brand-mark{
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.4rem;
    color: var(--pine-2);
}
.brand-mark-accent{ color: var(--mustard-2); }
.site-nav{ display: flex; gap: 28px; }
.site-nav a{
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--ink-soft);
    padding: 6px 2px;
    border-bottom: 2px solid transparent;
}
.site-nav a:hover, .site-nav a.active{
    color: var(--pine-2);
    border-bottom-color: var(--mustard);
}

/* ---------------- Footer ---------------- */
.site-footer{
    border-top: 1px solid var(--sage);
    margin-top: 64px;
    padding: 22px 0 40px;
    color: var(--ink-soft);
    font-size: 0.88rem;
}
.footer-inner{ display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.footer-inner a{ font-weight: 600; }

/* ---------------- Hero (home) ---------------- */
.hero{
    padding: 64px 0 40px;
    border-bottom: 1px solid var(--sage);
}
.hero .eyebrow{
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.09em;
    font-size: 0.76rem;
    color: var(--mustard-2);
    font-weight: 500;
    display: block;
    margin-bottom: 14px;
}
.hero h1{
    font-size: clamp(2.1rem, 4.5vw, 3.2rem);
    max-width: 14ch;
}
.hero .lede{
    font-size: 1.12rem;
    color: var(--ink-soft);
    max-width: 56ch;
}

/* Signature interactive demo: click a word, hear + see translation */
.demo-card{
    margin-top: 32px;
    background: var(--white);
    border: 1px solid var(--sage);
    border-radius: var(--radius);
    padding: 28px 28px 24px;
    box-shadow: var(--shadow);
}
.demo-card .demo-label{
    font-family: var(--font-mono);
    font-size: 0.76rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--ink-soft);
    margin-bottom: 12px;
    display: block;
}
.demo-sentence{
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--pine-2);
}
.demo-translation{
    min-height: 1.4em;
    margin-top: 14px;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    color: var(--mustard-2);
}

/* ---------------- Clickable glossary word ---------------- */
.w{
    cursor: pointer;
    border-bottom: 2px dotted var(--mustard-2);
    padding: 0 1px;
    border-radius: 3px;
    transition: background-color .15s ease, color .15s ease;
}
.w:hover, .w:focus-visible{
    background: var(--paper-2);
    color: var(--pine-2);
}
.w.is-active{
    background: var(--mustard);
    color: var(--pine-2);
    border-bottom-color: var(--pine-2);
}
.w.no-glossary{
    border-bottom-style: dotted;
    border-bottom-color: var(--sage);
}

/* floating translation tooltip */
.word-tooltip{
    position: absolute;
    z-index: 40;
    background: var(--pine-2);
    color: var(--paper);
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    max-width: 240px;
    box-shadow: var(--shadow);
    pointer-events: none;
    opacity: 0;
    transform: translateY(4px);
    transition: opacity .12s ease, transform .12s ease;
}
.word-tooltip.visible{ opacity: 1; transform: translateY(0); }
.word-tooltip .wt-word{
    font-family: var(--font-mono);
    color: var(--mustard);
    display: block;
    margin-bottom: 4px;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.word-tooltip .wt-line{ display: block; }
.word-tooltip .wt-empty{ color: var(--sage); font-style: italic; }

/* ---------------- Section / page shell ---------------- */
.page-section{ padding: 48px 0; }
.section-head{ margin-bottom: 32px; }
.section-head .eyebrow{
    font-family: var(--font-mono);
    text-transform: uppercase;
    font-size: 0.76rem;
    letter-spacing: 0.08em;
    color: var(--mustard-2);
    font-weight: 500;
}

/* ---------------- Grammar cards ---------------- */
.grammar-path{ display: flex; flex-direction: column; gap: 16px; }
.grammar-card{
    background: var(--white);
    border: 1px solid var(--sage);
    border-radius: var(--radius);
    padding: 24px 26px;
    box-shadow: var(--shadow);
    transition: transform .15s ease, box-shadow .15s ease;
}
.grammar-card:hover{ transform: translateY(-2px); box-shadow: 0 8px 22px rgba(31,75,71,0.12); }
.grammar-card a.card-link{ display: block; }
.grammar-card h3{ font-size: 1.25rem; margin-bottom: 4px; }
.grammar-card .subtitle{
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--ink-soft);
}

.grammar-detail{
    background: var(--white);
    border: 1px solid var(--sage);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow);
}
.grammar-detail ul{ padding-left: 1.2em; }
.grammar-detail li{ margin-bottom: 8px; }
.grammar-detail .mini-table{ border-collapse: collapse; margin: 12px 0; }
.grammar-detail .mini-table td{ padding: 6px 16px 6px 0; border-bottom: 1px solid var(--paper-2); }
.grammar-detail p.tip{
    background: var(--paper-2);
    border-left: 3px solid var(--mustard);
    padding: 10px 14px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 0.95rem;
    color: var(--pine-2);
    margin-top: 16px;
}
.back-link{
    display: inline-block;
    margin-bottom: 18px;
    font-weight: 600;
    font-size: 0.9rem;
}

/* ---------------- Reading library ---------------- */
.reading-grid{
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
}
.reading-card{
    background: var(--white);
    border: 1px solid var(--sage);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    transition: transform .15s ease, box-shadow .15s ease;
}
.reading-card:hover{ transform: translateY(-2px); box-shadow: 0 8px 22px rgba(31,75,71,0.12); }
.reading-card .tags{ display:flex; gap:8px; margin-bottom: 10px; flex-wrap: wrap;}
.tag{
    font-family: var(--font-mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 3px 9px;
    border-radius: 20px;
    background: var(--paper-2);
    color: var(--pine-2);
}
.tag.level{ background: var(--pine); color: var(--paper); }
.reading-card h3{ font-size: 1.2rem; }
.reading-card p{ color: var(--ink-soft); font-size: 0.94rem; flex-grow: 1; }
.reading-card .go{ font-weight: 600; font-size: 0.9rem; margin-top: 10px; }

/* ---------------- Reading block page ---------------- */
.reading-meta{ margin-bottom: 26px; }
.reading-passage{
    background: var(--white);
    border: 1px solid var(--sage);
    border-radius: var(--radius);
    padding: 32px 34px;
    box-shadow: var(--shadow);
    font-family: var(--font-display);
    font-size: 1.22rem;
    line-height: 1.85;
    color: var(--ink);
}
.reading-passage p{ margin: 0 0 1.1em; }
.passage-hint{
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--ink-soft);
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.passage-hint .dot{ width:6px; height:6px; border-radius:50%; background: var(--mustard); display:inline-block;}

.block-nav-audio{
    display:flex; gap:10px; margin-bottom: 18px; flex-wrap: wrap;
}

/* ---------------- Buttons ---------------- */
.btn{
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.92rem;
    padding: 11px 20px;
    border-radius: 999px;
    border: 1px solid transparent;
    cursor: pointer;
    background: var(--pine);
    color: var(--paper);
    transition: background-color .15s ease, transform .1s ease;
}
.btn:hover{ background: var(--pine-2); color: var(--paper); }
.btn:active{ transform: scale(0.98); }
.btn.btn-outline{
    background: transparent;
    color: var(--pine);
    border-color: var(--pine);
}
.btn.btn-outline:hover{ background: var(--pine); color: var(--paper); }
.btn.btn-accent{ background: var(--mustard); color: var(--pine-2); }
.btn.btn-accent:hover{ background: var(--mustard-2); }
.btn.btn-sm{ padding: 7px 14px; font-size: 0.82rem; }
.btn[disabled]{ opacity: 0.5; cursor: not-allowed; }

/* ---------------- Comprehension quiz ---------------- */
.quiz{
    margin-top: 40px;
    background: var(--white);
    border: 1px solid var(--sage);
    border-radius: var(--radius);
    padding: 28px 30px;
    box-shadow: var(--shadow);
}
.quiz h2{ font-size: 1.4rem; }
.quiz-q{ margin-bottom: 22px; padding-bottom: 20px; border-bottom: 1px solid var(--paper-2); }
.quiz-q:last-of-type{ border-bottom: none; }
.quiz-q .q-text{ font-weight: 600; margin-bottom: 10px; }
.quiz-options{ display: flex; flex-direction: column; gap: 8px; }
.quiz-option{
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 10px 14px;
    border: 1px solid var(--sage);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.95rem;
}
.quiz-option:hover{ background: var(--paper-2); }
.quiz-option.correct{ border-color: var(--pine); background: #E6EFE9; }
.quiz-option.incorrect{ border-color: var(--coral); background: #F7E9E7; }
.quiz-option input{ margin-top: 3px; }
.quiz-feedback{ font-size: 0.85rem; margin-top: 6px; font-weight: 600; }
.quiz-feedback.correct{ color: var(--pine); }
.quiz-feedback.incorrect{ color: var(--coral); }
.quiz-score{
    margin-top: 6px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--pine-2);
}

/* ---------------- Essay task ---------------- */
.essay-task{
    margin-top: 32px;
    background: var(--paper-2);
    border: 1px solid var(--sage);
    border-radius: var(--radius);
    padding: 28px 30px;
}
.essay-task h2{ font-size: 1.4rem; }
.essay-task .prompt{
    font-style: italic;
    color: var(--pine-2);
    margin-bottom: 16px;
}
.essay-task textarea{
    width: 100%;
    min-height: 220px;
    font-family: var(--font-body);
    font-size: 1rem;
    padding: 16px;
    border: 1px solid var(--sage);
    border-radius: var(--radius-sm);
    resize: vertical;
    background: var(--white);
    color: var(--ink);
}
.essay-task input[type=text]{
    width: 100%;
    max-width: 280px;
    padding: 10px 14px;
    border: 1px solid var(--sage);
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    margin-bottom: 14px;
}
.essay-footer{
    display: flex;
    align-items: center;
    gap: 16px;
    margin-top: 14px;
    flex-wrap: wrap;
}
.word-count{ font-family: var(--font-mono); font-size: 0.82rem; color: var(--ink-soft); }
.essay-status{ font-size: 0.88rem; font-weight: 600; color: var(--pine); }

/* ---------------- Forms (admin) ---------------- */
.admin-shell{ max-width: 760px; margin: 0 auto; padding: 48px 24px 80px; }
.admin-box{
    background: var(--white);
    border: 1px solid var(--sage);
    border-radius: var(--radius);
    padding: 30px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}
.field{ margin-bottom: 18px; }
.field label{ display:block; font-weight:600; margin-bottom:6px; font-size: 0.92rem;}
.field input[type=text], .field input[type=password], .field select, .field textarea{
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--sage);
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 0.96rem;
    background: var(--white);
    color: var(--ink);
}
.field textarea{ min-height: 120px; font-family: var(--font-mono); font-size: 0.88rem; }
.field .help{ font-size: 0.8rem; color: var(--ink-soft); margin-top: 4px; }
.admin-list{ list-style: none; padding: 0; margin: 0; }
.admin-list li{
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--paper-2);
    gap: 12px;
}
.admin-list li:last-child{ border-bottom: none; }
.admin-actions{ display: flex; gap: 10px; }
.flash{
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    font-weight: 600;
    font-size: 0.92rem;
}
.flash.ok{ background:#E6EFE9; color: var(--pine-2); }
.flash.err{ background:#F7E9E7; color: var(--coral); }

/* ---------------- Vocabulary flashcards ---------------- */
.level-tabs{
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 28px;
}
.category-tabs{ margin-top: -14px; margin-bottom: 26px; }
.category-tabs .level-tab{ padding: 6px 14px; font-size: 0.8rem; }
.level-tab{
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.88rem;
    padding: 9px 18px;
    border-radius: 999px;
    border: 1px solid var(--sage);
    background: var(--white);
    color: var(--ink-soft);
}
.level-tab.active{ background: var(--pine); color: var(--paper); border-color: var(--pine); }
.level-tab:hover:not(.active){ background: var(--paper-2); color: var(--pine-2); }

.vocab-grid{
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
    gap: 18px;
}
.flip-card{
    perspective: 1200px;
    height: 240px;
}
.flip-card-inner{
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.5s cubic-bezier(.4,.2,.2,1);
    transform-style: preserve-3d;
    cursor: pointer;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.flip-card.flipped .flip-card-inner{ transform: rotateY(180deg); }
.flip-face{
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    border-radius: var(--radius);
    border: 1px solid var(--sage);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    background: var(--white);
}
.flip-front .card-photo{
    flex: 1;
    background-size: cover;
    background-position: center;
    background-color: var(--paper-2);
}
.flip-front .card-word{
    padding: 10px 12px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.15rem;
    color: var(--pine-2);
    text-align: center;
}
.flip-front .card-hint{
    position: absolute;
    top: 8px;
    right: 10px;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    background: rgba(255,255,255,0.85);
    padding: 2px 8px;
    border-radius: 20px;
    color: var(--ink-soft);
}
.flip-back{
    transform: rotateY(180deg);
    background: var(--pine-2);
    color: var(--paper);
    padding: 20px;
    justify-content: center;
    align-items: center;
    text-align: center;
    gap: 8px;
}
.flip-back .back-word{ font-family: var(--font-mono); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--mustard); }
.flip-back .back-ru, .flip-back .back-kk{ font-size: 1rem; font-weight: 600; }
.flip-back .back-example{ font-size: 0.82rem; font-style: italic; color: var(--sage); margin-top: 6px; }
.flip-back .back-speak{
    margin-top: 10px;
    background: var(--mustard);
    color: var(--pine-2);
    border: none;
    border-radius: 999px;
    padding: 6px 14px;
    font-weight: 600;
    font-size: 0.8rem;
    cursor: pointer;
}

@media (max-width: 640px){
    .header-inner{ height: 60px; flex-wrap: wrap; }
    .site-nav{ gap: 16px; order: 3; width: 100%; }
    .site-nav a{ font-size: 0.85rem; }
    .reading-passage{ padding: 22px 20px; font-size: 1.08rem; }
    .demo-card, .quiz, .essay-task, .admin-box{ padding: 20px; }
    .vocab-grid{ grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
    .flip-card{ height: 210px; }
}