/* ========================================================================
   SUDOKU

   Gestaltung: duenne Linien, ruhige Flaechen. Die Zellenlinien entstehen aus
   der 1px-Luecke des Grids (der Grid-Hintergrund scheint durch), die
   Blocklinien aus 1px-Raendern an den Zellen der Spalten/Zeilen 3 und 6.
   Deshalb hat .sdk-cell box-sizing: border-box - sonst waechst die Zelle um
   die Rahmenbreite aus ihrer Grid-Spur heraus.
   ======================================================================== */

.sdk-game-container {
    /* --- Geometrie --- */
    --sdk-cell-size: 56px;
    --sdk-font-size: 24px;
    --sdk-pencil-size: 11px;
    --sdk-grid-radius: 14px;

    /* --- Flaechen --- */
    --sdk-bg: #161f2b;
    --sdk-bg-light: #1d2836;
    --sdk-grid-bg: #ffffff;
    --sdk-cell-hover: #f4f7fb;

    /* --- Linien: duenn, die Blocklinie nur wenig kraeftiger --- */
    --sdk-cell-line: #e3e9f0;
    --sdk-box-line: #3a4a5f;

    /* --- Ziffern --- */
    --sdk-given-color: #16233a;
    --sdk-player-color: #2f6fbf;
    --sdk-pencil-color: #8b9aab;

    /* --- Zustaende --- */
    --sdk-error-color: #d0464a;
    --sdk-error-bg: rgba(208, 70, 74, 0.10);
    --sdk-selected-bg: #d7e6fa;
    --sdk-selected-border: #4a8ad0;
    --sdk-highlight-bg: #eef3fa;
    --sdk-number-highlight-bg: #dce9fb;

    /* --- Bedienelemente --- */
    --sdk-key-bg: #263141;
    --sdk-key-bg-hover: #2f3d50;
    --sdk-key-line: rgba(255, 255, 255, 0.07);
    --sdk-key-text: #e8eef6;
    --sdk-muted: #7f93a8;
    --sdk-gold: #c8a84e;
    --sdk-gold-light: #e8c86e;

    background: linear-gradient(180deg, var(--sdk-bg-light) 0%, var(--sdk-bg) 100%);
    box-sizing: border-box;
    user-select: none;
    -webkit-user-select: none;
    align-items: center;
    font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
}

/* --- Gitter --- */
.sdk-grid-wrapper {
    /* fit-content, sonst dehnt sich das weisse Panel als Block-Element auf die
       Breite der Zifferntasten und ragt rechts ueber das Raster hinaus. */
    width: fit-content;
    margin: 0 auto;
    background: var(--sdk-grid-bg);
    border-radius: var(--sdk-grid-radius);
    overflow: hidden;   /* schneidet die Eckzellen auf den Radius zu */
    box-shadow:
        0 0 0 1px rgba(255, 255, 255, 0.10),
        0 14px 34px rgba(0, 0, 0, 0.42);
}

.sdk-grid {
    display: grid;
    grid-template-columns: repeat(9, var(--sdk-cell-size));
    grid-template-rows: repeat(9, var(--sdk-cell-size));
    background: var(--sdk-cell-line);
    gap: 1px;
}

/* --- Zelle --- */
.sdk-cell {
    box-sizing: border-box;
    width: var(--sdk-cell-size);
    height: var(--sdk-cell-size);
    background: var(--sdk-grid-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    position: relative;
    transition: background-color 0.1s ease;
}

.sdk-cell:hover {
    background: var(--sdk-cell-hover);
}

/* Blockgrenzen - 1px statt 2px, ohne negative Margins */
.sdk-cell.sdk-br { border-right: 1px solid var(--sdk-box-line); }
.sdk-cell.sdk-bb { border-bottom: 1px solid var(--sdk-box-line); }

/* --- Zellzustaende --- */
.sdk-cell.sdk-selected {
    background: var(--sdk-selected-bg) !important;
    box-shadow: inset 0 0 0 2px var(--sdk-selected-border);
    z-index: 2;
}

.sdk-cell.sdk-highlighted {
    background: var(--sdk-highlight-bg);
}

.sdk-cell.sdk-number-match {
    background: var(--sdk-number-highlight-bg);
}

.sdk-cell.sdk-error-cell {
    background: var(--sdk-error-bg);
}

/* --- Ziffern --- */
.sdk-value {
    font-size: var(--sdk-font-size);
    font-weight: 600;
    line-height: 1;
}

.sdk-cell.sdk-given .sdk-value {
    color: var(--sdk-given-color);
    font-weight: 700;
}

.sdk-cell.sdk-player .sdk-value {
    color: var(--sdk-player-color);
}

.sdk-cell.sdk-has-error .sdk-value {
    color: var(--sdk-error-color);
}

/* --- Notizen --- */
.sdk-pencil {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    width: 100%;
    height: 100%;
    padding: 2px;
    box-sizing: border-box;
}

.sdk-pencil-mark {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--sdk-pencil-size);
    color: var(--sdk-pencil-color);
    line-height: 1;
    font-weight: 500;
}

/* --- Zifferntasten --- */
.sdk-numpad {
    display: flex;
    gap: 8px;
    margin-top: 18px;
    flex-wrap: wrap;
    justify-content: center;
}

.sdk-num-btn,
.sdk-action-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    height: 58px;
    border: 1px solid var(--sdk-key-line);
    border-radius: 10px;
    background: var(--sdk-key-bg);
    color: var(--sdk-key-text);
    cursor: pointer;
    font-family: inherit;
    transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.sdk-num-btn { width: 50px; }

/* Aktionstasten tragen Text, deshalb mitwachsende Breite */
.sdk-action-btn {
    min-width: 64px;
    padding: 0 10px;
    color: var(--sdk-muted);
    font-size: 17px;
}

.sdk-num-btn:hover:not(:disabled),
.sdk-action-btn:hover:not(:disabled) {
    background: var(--sdk-key-bg-hover);
    border-color: rgba(255, 255, 255, 0.14);
    color: var(--sdk-key-text);
}

.sdk-num-btn:active:not(:disabled),
.sdk-action-btn:active:not(:disabled) {
    background: #212b39;
}

.sdk-num-btn:disabled,
.sdk-action-btn:disabled {
    opacity: 0.3;
    cursor: default;
}

.sdk-num-btn:focus-visible,
.sdk-action-btn:focus-visible {
    outline: 2px solid var(--sdk-player-color);
    outline-offset: 2px;
}

.sdk-num-btn.sdk-num-active {
    background: rgba(47, 111, 191, 0.28);
    border-color: rgba(47, 111, 191, 0.65);
    color: #ffffff;
}

.sdk-action-btn.sdk-pencil-active {
    background: rgba(200, 168, 78, 0.20);
    border-color: rgba(200, 168, 78, 0.55);
    color: var(--sdk-gold-light);
}

.sdk-num-val {
    font-size: 21px;
    font-weight: 600;
    line-height: 1;
}

.sdk-num-remaining {
    font-size: 10px;
    font-weight: 500;
    line-height: 1;
    color: var(--sdk-muted);
}

.sdk-num-btn.sdk-num-active .sdk-num-remaining {
    color: rgba(255, 255, 255, 0.7);
}

.sdk-action-label {
    font-size: 10px;
    line-height: 1;
}

/* --- Bedienhinweis --- */
.sdk-hint {
    margin-top: 16px;
    font-size: 12.5px;
    line-height: 1.5;
    color: var(--sdk-muted);
    text-align: center;
    max-width: 520px;
}

/* --- Gewonnen --- */
.sdk-win-overlay {
    position: fixed;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.7);
    z-index: 20000;
    animation: sdkFadeIn 0.5s ease;
    backdrop-filter: blur(6px);
}

.sdk-win-card {
    background: linear-gradient(135deg, var(--sdk-bg-light) 0%, var(--sdk-bg) 100%);
    border: 1px solid rgba(200, 168, 78, 0.55);
    border-radius: 16px;
    padding: 36px 56px;
    text-align: center;
    color: #dfe6ef;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    animation: sdkScaleIn 0.5s ease 0.2s both;
}

.sdk-win-title {
    font-size: 30px;
    font-weight: 600;
    color: var(--sdk-gold-light);
    margin-bottom: 14px;
    letter-spacing: 1px;
}

.sdk-win-stats {
    font-size: 15px;
    margin-bottom: 24px;
    line-height: 1.8;
}

.sdk-win-stats strong {
    color: var(--sdk-gold-light);
    font-weight: 500;
}

@keyframes sdkFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes sdkScaleIn {
    from { opacity: 0; transform: scale(0.8); }
    to { opacity: 1; transform: scale(1); }
}

/* --- Fehler-Ruettler --- */
.sdk-cell.sdk-shake {
    animation: sdkShake 0.3s ease;
}

@keyframes sdkShake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-3px); }
    75% { transform: translateX(3px); }
}

/* --- Responsive --- */
@media (max-width: 600px) {
    .sdk-game-container {
        --sdk-cell-size: 40px;
        --sdk-font-size: 18px;
        --sdk-pencil-size: 8px;
        --sdk-grid-radius: 10px;
    }

    .sdk-num-btn { width: 38px; }
    .sdk-num-btn, .sdk-action-btn { height: 46px; }
    .sdk-action-btn { min-width: 52px; padding: 0 7px; font-size: 15px; }
    .sdk-num-val { font-size: 18px; }
    .sdk-num-remaining { font-size: 9px; }
    .sdk-action-label { font-size: 9px; }
    .sdk-numpad { gap: 5px; margin-top: 14px; }
    .sdk-hint { font-size: 11.5px; margin-top: 12px; max-width: 400px; }
    .sdk-win-card { padding: 24px 32px; }
    .sdk-win-title { font-size: 24px; }
}

@media (max-width: 420px) {
    .sdk-game-container {
        --sdk-cell-size: 34px;
        --sdk-font-size: 16px;
        --sdk-pencil-size: 7px;
        --sdk-grid-radius: 8px;
    }

    .sdk-num-btn { width: 31px; }
    .sdk-num-btn, .sdk-action-btn { height: 40px; }
    .sdk-action-btn { min-width: 44px; padding: 0 5px; font-size: 14px; }
    .sdk-num-val { font-size: 16px; }
    .sdk-numpad { gap: 4px; }
}