/* ==========================================================================
   Generátor křížovek — design tokens
   Identity: a Czech print puzzle magazine — newsprint paper, grid squares,
   editor's red pen for the tajenka/solution, ink for structure.
   ========================================================================== */

:root {
    --paper: #ede7d9;
    --paper-line: #d8cfb8;
    --panel: #faf7ef;
    --ink: #201d1a;
    --ink-soft: #55504a;
    --red: #b23a2e;
    --red-soft: #f3dcd6;
    --teal: #1d6b5c;
    --teal-soft: #d9ece7;
    --block: #201d1a;
    --block-text: #f3efe6;
    --shadow: 0 1px 0 rgba(32, 29, 26, 0.06), 0 8px 24px -16px rgba(32, 29, 26, 0.35);
    --radius: 3px;
    --font-display: "Archivo Narrow", "Arial Narrow", "Helvetica Neue", Arial, sans-serif;
    --font-body: Georgia, "Iowan Old Style", "Times New Roman", serif;
    --font-mono: ui-monospace, "SF Mono", "Cascadia Code", "Consolas", "DejaVu Sans Mono", monospace;
}

@media (prefers-color-scheme: dark) {
    :root {
        --paper: #1b1c1e;
        --paper-line: #34322d;
        --panel: #232426;
        --ink: #ede8dc;
        --ink-soft: #a9a396;
        --red: #e06a54;
        --red-soft: #3a2620;
        --teal: #4fb39e;
        --teal-soft: #17332d;
        --block: #0f1011;
        --block-text: #ede8dc;
        --shadow: 0 1px 0 rgba(0, 0, 0, 0.4), 0 8px 24px -16px rgba(0, 0, 0, 0.7);
    }
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--paper);
    background-image:
        linear-gradient(var(--paper-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--paper-line) 1px, transparent 1px);
    background-size: 28px 28px;
    color: var(--ink);
    font-family: var(--font-body);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--teal); }

/* ---------- Masthead ---------- */

.masthead {
    padding: 3rem 1.5rem 2rem;
    text-align: center;
    border-bottom: 3px solid var(--ink);
}

.masthead-inner { max-width: 720px; margin: 0 auto; }

.eyebrow {
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-size: 0.72rem;
    color: var(--red);
    margin: 0 0 0.6rem;
    font-weight: 700;
}

.title {
    font-family: var(--font-display);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    font-size: clamp(2.1rem, 6vw, 3.4rem);
    margin: 0;
    line-height: 1.02;
}

.title-accent { color: var(--red); }

.subtitle {
    font-family: var(--font-body);
    font-style: italic;
    color: var(--ink-soft);
    font-size: 1.05rem;
    margin: 0.9rem 0 0;
}

/* ---------- Layout ---------- */

.layout {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1.25rem 4rem;
}

/* ---------- Tabs ---------- */

.tabs {
    display: flex;
    gap: 0.25rem;
    border-bottom: 1px solid var(--paper-line);
    margin-bottom: 1.5rem;
}

.tab {
    font-family: var(--font-display);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    font-weight: 700;
    font-size: 0.95rem;
    background: none;
    border: none;
    padding: 0.85rem 0.4rem;
    margin-right: 1.5rem;
    color: var(--ink-soft);
    cursor: pointer;
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tab-mark {
    width: 9px;
    height: 9px;
    border: 1.5px solid currentColor;
    display: inline-block;
}

.tab.is-active { color: var(--ink); }
.tab.is-active .tab-mark { background: var(--red); border-color: var(--red); }

.tab.is-active::after {
    content: "";
    position: absolute;
    left: 0; right: 0; bottom: -1px;
    height: 3px;
    background: var(--red);
}

/* ---------- Panels ---------- */

.panel {
    background: var(--panel);
    border: 1px solid var(--paper-line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.75rem;
    margin-bottom: 1.75rem;
}

/* ---------- Form ---------- */

.field { margin-bottom: 1.25rem; }

.field-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem 1.25rem;
}

label, .field-label {
    display: block;
    font-family: var(--font-mono);
    text-transform: uppercase;
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    color: var(--ink-soft);
    margin-bottom: 0.4rem;
    font-weight: 600;
}

input[type="text"],
input[type="number"],
select {
    width: 100%;
    font-family: var(--font-body);
    font-size: 1.15rem;
    padding: 0.6rem 0.7rem;
    border: 1px solid var(--paper-line);
    border-radius: var(--radius);
    background: var(--paper);
    color: var(--ink);
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus,
button:focus-visible {
    outline: 2px solid var(--teal);
    outline-offset: 1px;
}

#field-tajenka {
    font-family: var(--font-mono);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    font-size: 1.3rem;
}

.field-hint {
    font-size: 0.82rem;
    color: var(--ink-soft);
    margin: 0.5rem 0 0;
}

/* Live tajenka preview: turns the typed phrase into little crossword
   answer cells as the signature interaction of the form. */
.tajenka-live-preview {
    display: flex;
    flex-wrap: wrap;
    gap: 3px;
    margin-top: 0.6rem;
    min-height: 2.1rem;
}

.tajenka-live-preview .tp-cell {
    width: 1.7rem;
    height: 1.7rem;
    border: 1.5px solid var(--ink);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1rem;
    background: var(--paper);
}

.tajenka-live-preview .tp-gap { width: 0.8rem; }

.segmented {
    display: flex;
    border: 1px solid var(--paper-line);
    border-radius: var(--radius);
    overflow: hidden;
}

.segmented-option {
    flex: 1;
    text-align: center;
    padding: 0.6rem 0.5rem;
    cursor: pointer;
    font-family: var(--font-display);
    text-transform: uppercase;
    font-weight: 700;
    font-size: 0.85rem;
    letter-spacing: 0.03em;
    color: var(--ink-soft);
    background: var(--paper);
    border-right: 1px solid var(--paper-line);
    margin: 0;
}

.segmented-option:last-child { border-right: none; }
.segmented-option input { position: absolute; opacity: 0; pointer-events: none; }

.segmented-option:has(input:checked),
.segmented-option.is-checked {
    background: var(--ink);
    color: var(--block-text);
}

.checkbox-field {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--ink-soft);
    margin-top: 1rem;
    cursor: pointer;
}

.advanced {
    margin: 1.25rem 0;
    border-top: 1px dashed var(--paper-line);
    padding-top: 1rem;
}

.advanced summary {
    cursor: pointer;
    font-family: var(--font-mono);
    text-transform: uppercase;
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    color: var(--teal);
    font-weight: 700;
}

.form-actions { margin-top: 1.5rem; }

.form-error {
    color: var(--red);
    font-weight: 700;
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    background: var(--red-soft);
    border-radius: var(--radius);
}

/* ---------- Buttons ---------- */

.btn {
    font-family: var(--font-display);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    font-weight: 700;
    font-size: 0.85rem;
    border: 1.5px solid var(--ink);
    background: var(--panel);
    color: var(--ink);
    padding: 0.65rem 1.1rem;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background-color 0.15s ease, color 0.15s ease, transform 0.05s ease;
}

.btn:hover { background: var(--teal); border-color: var(--teal); color: #fff; }
.btn:active { transform: translateY(1px); }

.btn--primary {
    background: var(--red);
    border-color: var(--red);
    color: #fff;
    font-size: 0.95rem;
    padding: 0.8rem 1.6rem;
}

.btn--primary:hover { background: var(--ink); border-color: var(--ink); }

.btn--ghost { background: transparent; }

/* ---------- Result panel ---------- */

.result-panel { overflow-x: auto; }

.result-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.result-toolbar h2 {
    font-family: var(--font-display);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin: 0;
}

.result-buttons { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.result-content { display: flex; flex-direction: column; align-items: center; gap: 1.5rem; }

/* ---------- Puzzle board (shared grid mechanics) ---------- */

.puzzle-board {
    display: grid;
    grid-template-columns: repeat(var(--cols), minmax(1.9rem, 2.4rem));
    grid-template-rows: repeat(var(--rows), minmax(1.9rem, 2.4rem));
    gap: 1px;
    background: var(--paper-line);
    border: 2px solid var(--ink);
    max-width: 100%;
}

/* --- Crossword cells --- */

.cell {
    background: var(--panel);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    font-family: var(--font-mono);
}

.cell--letter { font-weight: 700; font-size: 1.05rem; }

/* Unused cells: a faint paper-toned fill, not a solid ink block - real
   print švédské křížovky read as almost entirely white/paper, with block
   cells barely distinguishable rather than screaming black squares. */
.cell--block { background: var(--paper-line); opacity: 0.6; }

.cell--clue {
    background: var(--panel);
    color: var(--ink);
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    padding: 2px 3px;
    font-size: 0.48rem;
    font-weight: 600;
    line-height: 1.12;
    text-align: left;
    text-transform: uppercase;
    overflow: hidden;
}

.clue { display: block; margin-bottom: 1px; }
.clue-arrow { font-style: normal; color: var(--ink-soft); margin-right: 2px; font-size: 0.6rem; }

.cell-num {
    position: absolute;
    top: 1px; left: 2px;
    font-size: 0.55rem;
    font-weight: 700;
    color: var(--red);
}

.cell--tajenka { box-shadow: inset 0 0 0 2px var(--red); }

.crossword-board[data-mode="puzzle"] .cell--letter .cell-letter { visibility: hidden; }
.crossword-board[data-mode="solution"] .cell--letter.cell--tajenka {
    background: var(--red-soft);
}
.crossword-board[data-mode="solution"] .cell--letter.cell--tajenka .cell-num { color: var(--red); }

/* --- Word search cells --- */

.wordsearch-board {
    grid-template-columns: repeat(var(--cols), minmax(1.5rem, 1.9rem));
    grid-template-rows: repeat(var(--rows), minmax(1.5rem, 1.9rem));
}

.ws-cell {
    background: var(--panel);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.95rem;
}

.wordsearch-board[data-mode="solution"] .ws-cell--tajenka {
    background: var(--red);
    color: #fff;
}
.wordsearch-board[data-mode="solution"] .ws-cell--word {
    background: var(--teal-soft);
}

/* ---------- Tajenka strip ---------- */

.tajenka-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 2px;
    justify-content: center;
}

.taj-cell {
    width: 1.8rem; height: 1.8rem;
    border: 1.5px solid var(--ink);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-weight: 700;
    background: var(--panel);
}

.taj-num {
    position: absolute;
    top: 0; left: 2px;
    font-size: 0.5rem;
    color: var(--red);
    font-weight: 700;
}

.result-content[data-mode="puzzle"] .taj-letter { visibility: hidden; }
.result-content[data-mode="solution"] .taj-cell { background: var(--red-soft); }

.taj-gap { width: 0.9rem; }

.tajenka-phrase {
    font-family: var(--font-mono);
    text-align: center;
    color: var(--ink-soft);
}

.result-content[data-mode="puzzle"] .tajenka-phrase { visibility: hidden; }

/* ---------- Word list (osmisměrka) ---------- */

.wordlist {
    background: var(--paper);
    border: 1px solid var(--paper-line);
    border-radius: var(--radius);
    padding: 1rem 1.5rem;
    max-width: 100%;
}

.wordlist h3 {
    font-family: var(--font-display);
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.05em;
    margin: 0 0 0.6rem;
}

.wordlist-items {
    columns: 3 140px;
    column-gap: 1.5rem;
    margin: 0; padding: 0;
    list-style: none;
    font-family: var(--font-mono);
    font-size: 0.92rem;
}

.wordlist-items li { break-inside: avoid; padding: 0.15rem 0; }

.result-content[data-mode="solution"] .wordlist-items li {
    text-decoration: line-through;
    color: var(--teal);
}

/* ---------- Loading overlay ---------- */

.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(32, 29, 26, 0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 50;
}

.loading-overlay[hidden] {
    display: none;
}

.loading-box {
    background: var(--panel);
    padding: 2rem 2.5rem;
    border-radius: var(--radius);
    text-align: center;
    font-family: var(--font-display);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.spinner {
    width: 34px; height: 34px;
    border: 4px solid var(--paper-line);
    border-top-color: var(--red);
    border-radius: 50%;
    margin: 0 auto 1rem;
    animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
    .spinner { animation: none; }
    .btn { transition: none; }
}

/* ---------- Footer ---------- */

.site-footer {
    text-align: center;
    color: var(--ink-soft);
    font-size: 0.82rem;
    padding: 2rem 1rem 3rem;
}

/* ---------- Advanced-options field visibility per tab ---------- */

body[data-active-tab="crossword"] [data-for="wordsearch"] { display: none; }
body[data-active-tab="wordsearch"] [data-for="crossword"] { display: none; }

/* ---------- Responsive ---------- */

@media (max-width: 640px) {
    .masthead { padding: 2rem 1rem 1.5rem; }
    .panel { padding: 1.1rem; }
    .result-toolbar { flex-direction: column; align-items: flex-start; }
}