/* =========================================================================
   Abaco Zuzzurellone — modern editorial B/W theme
   Sans for UI chrome, mono only where the words live (inputs + history).
   ========================================================================= */

:root {
    /* Palette: pure B/W + a few neutral grays for hierarchy */
    --ink: #0a0a0a;
    --ink-soft: #4a4a4a;
    --ink-muted: #8a8a8a;
    --line: #1a1a1a;
    --line-soft: #e5e5e5;
    --surface: #ffffff;
    --surface-alt: #fafafa;
    --surface-sunk: #f3f3f3;
    --win-bg: #ecf6ec;
    --win-line: #2e7d32;
    /* "Acqua / fuoco" heat map, from far (cold) to close (hot).
       Soft, slightly muted tones, yet each stop stays dark enough to carry white text:
       going lighter (true pastels, pure yellow or cyan) would make the words unreadable. */
    --heat-scale: #4f6fb0, #3f8a9c, #4f9460, #b08a45, #c4733f, #c95560;
    /* Revealed secret: guessed = the hottest stop of the scale above (keep the two in sync),
       surrendered = neutral grey, off the scale. Both carry white text. */
    --reveal-won: #c95560;
    --reveal-surrendered: #7b8089;

    /* Typography */
    --font-ui: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', 'Cascadia Mono', 'Courier New', monospace;

    /* Motion */
    --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
    --t-fast: 120ms;
    --t-med: 220ms;

    /* Shape */
    --r-sm: 4px;
    --r-md: 8px;
    --r-lg: 14px;
}

* {
    box-sizing: border-box;
}

/* The JS toggles sections via the `hidden` attribute; without this, any rule
   setting `display` (flex/grid) on those sections would keep them visible. */
[hidden] {
    display: none !important;
}

html, body {
    margin: 0;
    padding: 0;
    background: var(--surface-sunk);
    color: var(--ink);
    font-family: var(--font-ui);
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* Page container — a centered card with soft elevation */
.page {
    max-width: 760px;
    margin: 48px auto;
    padding: 40px 44px;
    background: var(--surface);
    border: 1px solid var(--line-soft);
    border-radius: var(--r-lg);
    box-shadow:
        0 1px 2px rgba(0, 0, 0, 0.04),
        0 8px 24px rgba(0, 0, 0, 0.06);
}

/* ---------- Header ---------- */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}

.title {
    font-family: var(--font-ui);
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin: 0;
    text-transform: none;
}

/* Subtle marker before the title for visual rhythm */
.title::before {
    content: "";
    display: inline-block;
    width: 8px;
    height: 8px;
    margin-right: 12px;
    background: var(--ink);
    border-radius: 50%;
    vertical-align: 2px;
}

/* Logo in place of the text title. <h1> only wraps the image, so it must not add line spacing */
.logo-title {
    margin: 0;
    line-height: 0;
    flex-shrink: 0;
}

/* Height drives the size; the width follows the picture's proportions */
.logo {
    display: block;
    height: 130px;
    width: auto;
}

/* Short description of the game, beside the logo */
.tagline {
    /* Takes the room left by the logo; below 200px it wraps under it instead of squeezing */
    flex: 1 1 200px;
    margin: 0;
    font-size: 15px;
    font-style: italic;
    line-height: 1.5;
    color: var(--ink-muted);
}

.controls {
    display: flex;
    align-items: center;
    gap: 10px;
}

.difficulty-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--ink-soft);
    text-transform: none;
    letter-spacing: 0;
}

/* ---------- Separator ---------- */
.rule {
    border: none;
    border-top: 1px solid var(--line-soft);
    margin: 28px 0;
}

/* ---------- Board ---------- */
.board {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.board-stack {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

/* Shared input geometry */
.word-input {
    width: 100%;
    padding: 13px 18px;
    font-family: var(--font-mono);
    font-size: 17px;
    font-weight: 500;
    letter-spacing: 0.02em;
    border: 1px solid var(--line-soft);
    border-radius: var(--r-md);
    background: var(--surface);
    color: var(--ink);
    transition:
        background var(--t-fast) var(--ease),
        border-color var(--t-fast) var(--ease),
        box-shadow var(--t-fast) var(--ease),
        transform var(--t-fast) var(--ease);
}

/* Past attempts & initial bounds: locked rows, white text on the heat-map fill.
   "Acqua / fuoco" hint: app.js sets --heat on each row (0 = far from the secret, 1 = very close). */
.word-input.bound {
    color: #fff;
    font-weight: 600;
    /* Keeps white text crisp on the lighter middle stops of the scale */
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.35);
    cursor: default;
    user-select: none;
    padding-left: 36px;
    position: relative;
    border-color: transparent;
    /* Fallback while --heat-scale is unavailable */
    background-color: #4f6fb0;
    /* Two layers: the leading white dot, then the heat color.
       The heat layer is the --heat-scale gradient stretched 100x wider than the row and
       slid by --heat, so the row shows (almost flat) the color found at that point of the scale. */
    background-image:
        radial-gradient(circle, #fff 3px, transparent 3.5px),
        linear-gradient(90deg, var(--heat-scale));
    background-repeat: no-repeat;
    background-position: 16px center, calc(var(--heat, 0) * 100%) 0;
    /* The dot needs an explicit size, or it would fill the row and land in its center */
    background-size: 8px 8px, 10000% 100%;
    background-clip: border-box;
}

/* Games without the color hint (hard): every locked row gets the same neutral fill.
   Only the dot layer is kept; the stale second position/size values are simply ignored. */
.word-input.bound.no-heat {
    background-color: var(--ink);
    background-image: radial-gradient(circle, #fff 3px, transparent 3.5px);
}

/* Hover slightly darkens the fill */
.word-input.bound:hover {
    filter: brightness(0.92);
}

/* Editable guess row — the star of the show */
.word-input.guess {
    background: var(--surface);
    border: 1px solid var(--ink);
    box-shadow: 0 0 0 0 rgba(0, 0, 0, 0);
    outline: none;
    font-weight: 600;
}

.word-input.guess::placeholder {
    color: var(--ink-muted);
    font-weight: 400;
    font-style: italic;
}

.word-input.guess:focus {
    box-shadow: 0 0 0 4px rgba(0, 0, 0, 0.08);
    transform: translateY(-1px);
}

.word-input.guess:disabled {
    background: var(--surface-alt);
    color: var(--ink-soft);
    border-color: var(--line-soft);
}

/* Winning row: subtle green wash, deliberate emphasis */
.word-input.guess.won,
.word-input.guess.won:disabled {
    background: var(--win-bg);
    color: var(--ink);
    border-color: var(--win-line);
    font-weight: 700;
    animation: winPulse 600ms var(--ease) 1;
}

@keyframes winPulse {
    0%   { transform: scale(1);    box-shadow: 0 0 0 0 rgba(46, 125, 50, 0.4); }
    60%  { transform: scale(1.02); box-shadow: 0 0 0 10px rgba(46, 125, 50, 0); }
    100% { transform: scale(1);    box-shadow: 0 0 0 0 rgba(46, 125, 50, 0); }
}

/* ---------- Actions ---------- */
.actions {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

button,
select {
    font-family: var(--font-ui);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.02em;
    padding: 10px 18px;
    border: 1px solid var(--ink);
    border-radius: var(--r-sm);
    background: var(--surface);
    color: var(--ink);
    cursor: pointer;
    transition:
        background var(--t-fast) var(--ease),
        color var(--t-fast) var(--ease),
        transform var(--t-fast) var(--ease),
        box-shadow var(--t-fast) var(--ease);
}

button {
    text-transform: uppercase;
}

button:hover:not(:disabled) {
    background: var(--ink);
    color: var(--surface);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

button:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: none;
}

button:disabled {
    cursor: not-allowed;
    color: var(--ink-muted);
    border-color: var(--line-soft);
    background: var(--surface);
}

/* Primary action — slight visual weight */
#submit-guess {
    background: var(--ink);
    color: var(--surface);
}
#submit-guess:hover:not(:disabled) {
    background: #000;
}

/* Secondary action — quieter */
#surrender {
    background: var(--surface);
    color: var(--ink);
}

/* The id rule above would otherwise keep a disabled button looking active */
#surrender:disabled {
    color: var(--ink-muted);
}

select {
    padding: 7px 28px 7px 10px;
    text-transform: none;
    font-weight: 500;
    border-color: var(--line-soft);
    appearance: none;
    background-image:
        linear-gradient(45deg, transparent 50%, var(--ink) 50%),
        linear-gradient(135deg, var(--ink) 50%, transparent 50%);
    background-position:
        calc(100% - 14px) 50%,
        calc(100% - 9px) 50%;
    background-size: 5px 5px, 5px 5px;
    background-repeat: no-repeat;
}

select:focus {
    outline: none;
    border-color: var(--ink);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.08);
}

#new-game {
    background: var(--ink);
    color: var(--surface);
}

/* ---------- History (collapsible) ---------- */
.history-section {
    margin-top: 8px;
}

.history-details {
    border-top: 1px solid var(--line-soft);
    padding-top: 16px;
}

.history-title {
    font-family: var(--font-ui);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    margin: 0;
    text-transform: uppercase;
    color: var(--ink-soft);
    cursor: pointer;
    user-select: none;
    list-style: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: color var(--t-fast) var(--ease);
}

.history-title:hover {
    color: var(--ink);
}

.history-title::-webkit-details-marker {
    display: none;
}

/* Replace the [+]/[-] glyph with a rotating chevron */
.history-title::before {
    content: "";
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 5px solid currentColor;
    transition: transform var(--t-med) var(--ease);
    transform: rotate(-90deg);
}

.history-details[open] > .history-title::before {
    transform: rotate(0deg);
}

.history-details[open] > .history-list {
    margin-top: 14px;
}

.history-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.history-list li {
    font-family: var(--font-mono);
    font-size: 14px;
    padding: 6px 10px;
    color: var(--ink);
    background: var(--surface-alt);
    border-radius: var(--r-sm);
    display: flex;
    align-items: center;
    gap: 8px;
}

.history-list li::before {
    content: "";
    width: 4px;
    height: 4px;
    background: var(--ink-muted);
    border-radius: 50%;
    flex-shrink: 0;
}

/* ---------- Banner (end-of-game / errors) ---------- */
.banner {
    margin-top: 28px;
    padding: 16px 20px;
    border: 1px solid var(--line-soft);
    border-left: 3px solid var(--ink);
    border-radius: var(--r-md);
    background: var(--surface-alt);
    font-size: 14px;
    line-height: 1.6;
    color: var(--ink);
    white-space: pre-wrap;
    /* A game code is one long unbroken string: let it wrap instead of overflowing */
    overflow-wrap: anywhere;
    animation: bannerIn 260ms var(--ease) 1;
}

.banner.error {
    border-left-color: #b00020;
    background: #fdf2f2;
}

@keyframes bannerIn {
    from { opacity: 0; transform: translateY(4px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ---------- Responsive tweaks ---------- */
@media (max-width: 640px) {
    .page {
        margin: 20px 16px;
        padding: 28px 22px;
    }
    .title {
        font-size: 20px;
    }
    .logo {
        height: 96px;
    }
    .tagline {
        font-size: 14px;
    }
    .word-input {
        font-size: 16px;
        padding: 12px 14px;
    }
    .word-input.bound {
        padding-left: 32px;
        /* Both layers must be restated: a single value would also move the heat layer */
        background-position: 14px center, calc(var(--heat, 0) * 100%) 0;
    }
    .actions {
        flex-wrap: wrap;
    }
}

/* ---------- Start screen — two-column card grid ---------- */
.start-screen {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    margin: 28px 0;
}

@media (max-width: 640px) {
    /* Stack the two start-screen cards vertically */
    .start-screen {
        grid-template-columns: 1fr;
    }
}

/* Individual option card — slightly sunken to distinguish from the page card */
.start-option {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: stretch;
    padding: 24px;
    background: var(--surface-alt);
    border: 1px solid var(--line-soft);
    border-radius: var(--r-md);
}

/* All interactive controls inside an option fill the card width */
.start-option select,
.start-option input,
.start-option button {
    width: 100%;
}

/* Section label — matches .history-title typographic scale */
.start-option-title {
    font-family: var(--font-ui);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ink-soft);
}

/* ---------- Revealed secret, as a dictionary entry ---------- */
/* Sits in the board stack in place of the guess row, between the words tried.
   Same typography as the attempt rows (.word-input.bound) for every text inside:
   children only change size, and the definition alone goes italic. */
.dict-entry {
    margin: 6px 0;
    padding: 18px 22px;
    border: 1px solid transparent;
    border-radius: var(--r-md);
    /* Surrendered by default: grey, the word was never reached */
    background: var(--reveal-surrendered);
    /* White text like the heat rows around it; children inherit it */
    color: #fff;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    font-family: var(--font-mono);
    font-size: 17px;
    font-weight: 600;
    letter-spacing: 0.02em;
    animation: bannerIn 260ms var(--ease) 1;
}

/* Follows the attempt rows' smaller size on narrow screens.
   Kept here: it must come after the base rule above to win over it. */
@media (max-width: 640px) {
    .dict-entry {
        font-size: 16px;
    }
}

/* Guessed correctly: "fuoco", the hot end of the heat scale */
.dict-entry.won {
    background: var(--reveal-won);
}

/* Outcome line above the headword ("Hai indovinato in N tentativi!") */
.dict-status {
    margin: 0 0 8px;
    font-size: 13px;
    opacity: 0.9;
}

.dict-head {
    margin: 0;
}

/* Headword: <dfn> is italic by default, keep it upright */
.dict-word {
    font-size: 22px;
    font-weight: 700;
    font-style: normal;
    line-height: 1.2;
}

/* Grammatical category (sostantivo, verbo, ...): plain upright line below the headword */
.dict-category {
    margin: 2px 0 0;
    font-size: 13px;
    opacity: 0.9;
}

/* The only italic text of the entry */
.dict-definition {
    margin: 10px 0 0;
    font-weight: 500;
    font-style: italic;
    line-height: 1.55;
}

/* ---------- Game-code input (import) ---------- */
/* Coherent with .word-input but at the smaller scale used in the card */
.code-input {
    padding: 12px 14px;
    font-family: var(--font-mono);
    font-size: 14px;
    border: 1px solid var(--line-soft);
    border-radius: var(--r-md);
    background: var(--surface);
    color: var(--ink);
    outline: none;
    transition:
        border-color var(--t-fast) var(--ease),
        box-shadow var(--t-fast) var(--ease);
}

.code-input::placeholder {
    color: var(--ink-muted);
    font-style: italic;
}

.code-input:focus {
    border-color: var(--ink);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.08);
}

/* ---------- Attempts countdown, shown in the guess placeholder ---------- */
/* Few attempts left: the placeholder turns to the "won/hot" red as a warning */
.word-input.guess.low::placeholder {
    color: var(--reveal-won);
    font-weight: 600;
}

/* ---------- Game code bar, top right above the attempts: import + export buttons ---------- */
.code-actions {
    display: flex;
    /* stretch: every button of the bar gets exactly the same height, icon-only one included */
    align-items: stretch;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 10px;
}

/* Back arrow: pushed to the far left of the bar, icon only */
.back-btn {
    margin-right: auto;
    padding: 6px 10px;
}

/* ---------- Import popup ---------- */
/* No `display` on the <dialog> itself: the browser hides it while closed */
.import-dialog {
    width: min(440px, calc(100vw - 32px));
    padding: 0;
    border: 1px solid var(--line-soft);
    border-radius: var(--r-lg);
    background: var(--surface);
    color: var(--ink);
    box-shadow: 0 20px 48px rgba(0, 0, 0, 0.22);
}

.import-dialog::backdrop {
    background: rgba(10, 20, 40, 0.45);
}

/* Padding lives on the form so a click on the dialog's own box means "backdrop" */
.dialog-form {
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding: 28px;
}

.dialog-title {
    margin: 0;
    font-size: 20px;
}

.dialog-warning,
.dialog-error {
    margin: 0;
    font-size: 14px;
}

.dialog-warning {
    color: var(--ink-soft);
}

.dialog-error {
    color: var(--reveal-won);
    font-weight: 600;
}

.dialog-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* Confirm is the primary action of the popup */
#import-confirm {
    background: var(--ink);
    color: var(--surface);
}

/* Button with a leading icon: keep icon and label on one centered line */
.icon-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-icon {
    flex-shrink: 0;
}

/* Quieter secondary button — smaller than the main actions */
.quiet-btn {
    padding: 6px 12px;
    font-size: 12px;
    border-color: var(--line-soft);
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}