/* ==========================================================================
   СтихиЛегко — calm cognitive theme
   Incremental layer on top of Bootstrap 5.1. No framework, no rewrite — only
   a softer palette, a paper-like canvas, and calmer reading typography so the
   interface recedes and memorization stays in focus.
   ========================================================================== */

:root {
    /* Paper canvas — warm off-white instead of harsh pure white */
    --paper:      #f6f3ec;
    --surface:    #fbf9f4;   /* cards / raised areas */
    --surface-2:  #f1ede4;   /* subtle fills (progress track, dots) */

    /* Ink — soft near-black instead of pure #000 */
    --ink:        #3c3a35;
    --ink-soft:   #756f66;   /* secondary / muted text */
    --hairline:   rgba(60, 50, 40, 0.12);

    /* Calm, desaturated accents (replace Bootstrap's loud defaults) */
    --calm-blue:       #5f7d95;
    --calm-blue-dark:  #4e6c84;
    --calm-green:      #74957c;
    --calm-green-dark: #61806a;
    --calm-amber:      #b08a57;
    --calm-info:       #7fa6ad;

    /* Type families: book-like serif for verse, calm sans for UI */
    --serif: Georgia, 'PT Serif', 'Times New Roman', serif;
    --sans:  system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --mono:  'Menlo', 'Consolas', 'Ubuntu Mono', 'DejaVu Sans Mono', monospace;
}

/* --- Paper canvas ------------------------------------------------------- */
body {
    background-color: var(--paper);
    color: var(--ink);
    font-family: var(--sans);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--ink);
    font-weight: 600;
    letter-spacing: 0.1px;
}

a { color: var(--calm-blue-dark); text-decoration-color: rgba(78,108,132,0.35); }
a:hover { color: var(--calm-blue); }

.text-muted { color: var(--ink-soft) !important; }

/* --- Calmer brand colours (override Bootstrap's saturated utilities) ---- */
.bg-primary   { background-color: var(--calm-blue) !important; }
.bg-secondary { background-color: #9b948a !important; }
.bg-success   { background-color: var(--calm-green) !important; }
.bg-info      { background-color: var(--calm-info) !important; }
.bg-light     { background-color: var(--surface) !important; }

.text-primary { color: var(--calm-blue-dark) !important; }
.text-success { color: var(--calm-green-dark) !important; }

/* Navbar: a quiet book header, not a loud admin bar */
.navbar.bg-primary { background-color: var(--calm-blue) !important; }
.navbar-brand strong { font-weight: 600; letter-spacing: 0.4px; }
.navbar-dark .nav-link { color: rgba(255,255,255,0.85); }
.navbar-dark .nav-link:hover { color: #fff; }

/* Footer melts into the paper */
footer.bg-light {
    background-color: transparent !important;
    border-top: 1px solid var(--hairline);
}

/* --- Buttons: one calm dominant CTA, quieter secondaries ---------------- */
.btn {
    border-radius: 0.55rem;
    min-height: 38px;
    transition: background-color .15s ease, border-color .15s ease, color .15s ease;
}
.btn:hover { transform: none; }   /* no jumpy lift — calmer feedback */

.btn-primary {
    background-color: var(--calm-blue);
    border-color: var(--calm-blue);
}
.btn-primary:hover, .btn-primary:focus, .btn-primary:active {
    background-color: var(--calm-blue-dark);
    border-color: var(--calm-blue-dark);
}
/* The progression CTA gets a soft, calm presence */
.btn-primary.btn-lg, .btn-success.btn-lg {
    box-shadow: 0 1px 2px rgba(60,50,40,0.10);
    padding-inline: 1.4rem;
}

.btn-success {
    background-color: var(--calm-green);
    border-color: var(--calm-green);
}
.btn-success:hover, .btn-success:focus, .btn-success:active {
    background-color: var(--calm-green-dark);
    border-color: var(--calm-green-dark);
}

/* Outline / secondary actions: low-contrast, non-competing */
.btn-outline-primary   { color: var(--calm-blue-dark); border-color: rgba(95,125,149,0.45); }
.btn-outline-primary:hover   { background-color: var(--calm-blue); border-color: var(--calm-blue); color: #fff; }
.btn-outline-secondary { color: var(--ink-soft); border-color: var(--hairline); }
.btn-outline-secondary:hover { background-color: #efece4; border-color: var(--hairline); color: var(--ink); }
.btn-outline-info      { color: #5f8a91; border-color: rgba(127,166,173,0.45); }
.btn-outline-info:hover      { background-color: var(--calm-info); border-color: var(--calm-info); color: #fff; }
.btn-outline-success   { color: var(--calm-green-dark); border-color: rgba(116,149,124,0.45); }
.btn-outline-success:hover   { background-color: var(--calm-green); border-color: var(--calm-green); color: #fff; }
.btn-outline-warning   { color: var(--calm-amber); border-color: rgba(176,138,87,0.45); }
.btn-outline-warning:hover   { background-color: var(--calm-amber); border-color: var(--calm-amber); color: #fff; }

/* --- Cards: flatter & breathable, less "panel" ------------------------- */
.card {
    background-color: var(--surface);
    border: 1px solid var(--hairline);
    border-radius: 0.85rem;
    box-shadow: none;
}
.card:hover { box-shadow: none; }
.card-header {
    background-color: transparent;
    border-bottom: 1px solid var(--hairline);
    padding: 1rem 1.25rem;
}
.card-body   { padding: 1.5rem; }
.card-footer {
    background-color: transparent;
    border-top: 1px solid var(--hairline);
    padding: 1rem 1.25rem;
}

/* Badges: quiet labels, not loud chips */
.badge {
    font-weight: 500;
    letter-spacing: 0.2px;
    padding: 0.42em 0.7em;
    border-radius: 0.5rem;
}

/* Progress: thin, calm track */
.progress { background-color: var(--surface-2); border-radius: 1rem; }
.progress-bar { background-color: var(--calm-blue); }

/* Alerts: soft, never neon */
.alert { border: none; border-radius: 0.6rem; }

/* List-group: calm fill instead of the old acid gradient */
.list-group-item { background-color: transparent; border-color: var(--hairline); }
.list-group-item.active {
    background: var(--calm-blue);
    border-color: var(--calm-blue);
}
.list-group-item-success { background-color: rgba(116,149,124,0.14) !important; }

/* ==========================================================================
   Learn screen — calm reading typography & mnemonic anchors
   ========================================================================== */

/* The focused learning card: a hairline, not a heavy 2px frame */
.learn-card { border: 1px solid var(--hairline); }

.learn-header h2 { font-weight: 600; }

/* Stanza display — book-like serif with generous rhythm */
.poem-text {
    white-space: pre-wrap;
    font-family: var(--serif);
    font-size: 1.18rem;
    line-height: 1.95;
    letter-spacing: 0.2px;
    color: var(--ink);
}

/* First letters / partial recall — mnemonic ANCHORS, not ordinary UI text:
   larger, well-spaced, in a calm distinct ink so the eye treats them as cues. */
.skeleton-text {
    font-family: var(--mono);
    font-size: 1.45rem;
    letter-spacing: 4px;
    word-spacing: 8px;
    line-height: 2.1;
    color: var(--calm-blue-dark);
}

/* Generous breathing room around the current learning text */
.stage-text {
    max-width: 60ch;
    margin-inline: auto;
}

/* Compact stanza dots (single calm progress overview) */
.stanza-dots { display: flex; flex-wrap: wrap; gap: 6px; }
.stanza-dots .dot {
    width: 26px;
    height: 26px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 0.72rem;
    font-weight: 600;
    text-decoration: none;
    color: var(--ink-soft);
    background: var(--surface-2);
    transition: transform 0.15s ease;
}
.stanza-dots .dot.done    { background: var(--calm-green); color: #fff; }
.stanza-dots .dot.current { background: var(--calm-blue); color: #fff; box-shadow: 0 0 0 3px rgba(95,125,149,0.22); }
.stanza-dots .dot:hover   { transform: scale(1.1); }

/* De-emphasised advanced / technical / dangerous block */
.advanced-tools {
    border: 1px dashed var(--hairline);
    border-radius: 0.6rem;
    background: transparent;
}
.advanced-tools > summary {
    cursor: pointer;
    list-style: none;
    padding: 0.6rem 0.9rem;
    font-size: 0.85rem;
    color: var(--ink-soft);
    user-select: none;
}
.advanced-tools > summary::-webkit-details-marker { display: none; }
.advanced-tools > summary::before { content: "⚙ "; }
.advanced-tools[open] > summary { border-bottom: 1px solid var(--hairline); }
.advanced-tools .advanced-body { padding: 0.9rem; }

/* Card-style <details>: hide default triangle, calm disclosure caret */
details.card > summary { list-style: none; }
details.card > summary::-webkit-details-marker { display: none; }
details.card > summary::after {
    content: "▾";
    float: right;
    margin-left: 0.5rem;
    color: var(--ink-soft);
    transition: transform 0.2s ease;
}
details.card[open] > summary::after { transform: rotate(180deg); }

/* Don't lift / shadow on touch devices (avoids stuck :hover state) */
@media (hover: none) {
    .btn:hover, .card:hover { transform: none; box-shadow: inherit; }
}

/* --- Tablet & phone ---------------------------------------------------- */
@media (max-width: 768px) {
    /* Keep the learning card first; overview/help flow below */
    .learn-sidebar { margin-top: 1rem; }

    /* Larger, calmer reading on phones */
    .poem-text     { font-size: 1.22rem; line-height: 2; }
    .skeleton-text { font-size: 1.55rem; letter-spacing: 5px; word-spacing: 9px; }

    /* Thumb-friendly: comfortable height for primary actions */
    .learn-card .card-footer .btn,
    .stanza-nav .btn {
        min-height: 50px;
        font-size: 1.02rem;
    }

    /* Calmer vertical rhythm between stacked actions */
    .learn-card .card-footer .d-flex { gap: 0.6rem; }

    /* Sticky primary-action bar so the "next step" CTA is always reachable */
    .learn-card .card-footer {
        position: sticky;
        bottom: 0;
        z-index: 1020;
        background: var(--surface);
        border-top: 1px solid var(--hairline);
        box-shadow: 0 -2px 10px rgba(60,50,40,0.06);
    }
}

@media (max-width: 480px) {
    .learn-header h2 { font-size: 1.3rem; }
    .poem-text       { font-size: 1.24rem; }
    .skeleton-text   { font-size: 1.6rem; }

    /* Full-width footer buttons, generous tap target */
    .learn-card .card-footer .d-flex { flex-wrap: wrap; gap: 0.55rem; }
    .learn-card .card-footer .btn    { width: 100%; }

    /* Avoid horizontal squeeze of the stage badge / title row */
    .learn-card .card-header { flex-wrap: wrap; gap: 0.4rem; }
}