@import url("https://fonts.googleapis.com/css2?family=Press+Start+2P&display=swap");

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg: #1a3a5c;
    --card-face: #f0e8d0;
    --card-border: #1a1a1a;
    --red: #cc2222;
    --black: #111111;
    --shadow: #000000;
    --pile-empty: #0e2a47;
    --pile-border: #2a5a8c;
    --pile-border-red: #3a6a7c;
    --card-back-a: #152888;
    --card-back-b: #2244aa;
    --accent: #2244aa;
    --highlight: #ffdd00;
    --drop-target: #1a4a2c;
    --overlay: rgba(10, 20, 40, 0.55);
    --text: #ffffff;
    --text-secondary: #6a9cbf;
    --text-muted: #444444;
    --dot: #aaaaaa;
    --dot-border: #555555;
    --card-w: clamp(42px, calc((100vw - 24px) / 7.6), 100px);
    --card-h: calc(var(--card-w) * 1.4);
    --grid-gap: calc(var(--card-w) * 0.1);
    --body-pad: calc(var(--card-w) * 0.12);
}

body {
    background-color: var(--bg);
    font-family: "Press Start 2P", monospace;
    color: var(--text);
    min-height: 100vh;
    padding: var(--body-pad);
    user-select: none;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* ── Header ─────────────────────────────────────── */
header {
    display: flex;
    flex-direction: column;
    gap: calc(var(--card-w) * 0.2);
    margin: calc(var(--card-w) * 0.3) 0 calc(var(--card-w) * 0.5);
    width: calc(7 * var(--card-w) + 6 * var(--grid-gap));
}

h1 {
    font-size: calc(var(--card-w) * 0.22);
    letter-spacing: 2px;
    color: var(--card-face);
    text-shadow: 2px 2px 0 var(--shadow);
}

#byline {
    font-size: calc(var(--card-w) * 0.12);
    letter-spacing: 1px;
    color: var(--text-secondary);
    text-shadow: 2px 2px var(--pile-empty);
}

#header-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: calc(var(--card-w) * 0.08);
}

#header-buttons {
    display: flex;
    align-items: center;
    gap: calc(var(--card-w) * 0.12);
}

#move-counter {
    font-size: calc(var(--card-w) * 0.12);
    color: var(--text-secondary);
    letter-spacing: 1px;
    text-align: right;
}

#new-game-btn,
#play-again-btn,
#undo-btn,
#help-btn {
    font-family: "Press Start 2P", monospace;
    font-size: calc(var(--card-w) * 0.12);
    padding: calc(var(--card-w) * 0.1) calc(var(--card-w) * 0.14);
    background: var(--card-face);
    color: var(--black);
    border: 3px solid var(--black);
    box-shadow: 3px 3px 0 var(--shadow);
    cursor: pointer;
    image-rendering: pixelated;
    transition:
        transform 0.05s,
        box-shadow 0.05s;
}

#undo-btn {
    font-size: calc(var(--card-w) * 0.18);
    padding: calc(var(--card-w) * 0.05) calc(var(--card-w) * 0.12);
}

#new-game-btn:active,
#play-again-btn:active,
#undo-btn:active,
#help-btn:active {
    transform: translate(2px, 2px);
    box-shadow: 1px 1px 0 var(--shadow);
}

/* ── Board layout ────────────────────────────────── */
#board {
    display: flex;
    flex-direction: column;
    gap: calc(var(--card-w) * 0.16);
    width: calc(7 * var(--card-w) + 6 * var(--grid-gap));
}

/* Both rows share the same 7-column grid so foundations
   sit directly above tableau columns 3–6 */
#top-row,
#tableau {
    display: grid;
    grid-template-columns: repeat(7, var(--card-w));
    gap: var(--grid-gap);
    align-items: flex-start;
}

/* .spacer is the 3rd grid cell — keeps foundations in cols 4-7 */
.spacer {
    /* intentionally empty */
}

/* ── Pile (empty slot) ───────────────────────────── */
.pile {
    width: var(--card-w);
    min-height: var(--card-h);
    background: var(--pile-empty);
    border: 2px dashed var(--pile-border);
    position: relative;
    flex-shrink: 0;
}

/* Foundation label */
.foundation.pile::before {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: calc(var(--card-w) * 0.28);
    color: var(--pile-border);
    pointer-events: none;
}

.foundation[data-suit="spades"]::before {
    content: "♠";
}
.foundation[data-suit="hearts"]::before {
    content: "♥";
    color: var(--pile-border-red);
}
.foundation[data-suit="diamonds"]::before {
    content: "♦";
    color: var(--pile-border-red);
}
.foundation[data-suit="clubs"]::before {
    content: "♣";
}

#stock {
    cursor: pointer;
}

#stock .card {
    cursor: pointer;
}

/* Stock empty indicator */
#stock.empty::before {
    content: "↺";
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: calc(var(--card-w) * 0.36);
    color: var(--pile-border);
    pointer-events: none;
    font-family: sans-serif;
}

/* Stock depth ghost cards */
.stock-ghost {
    position: absolute;
    width: var(--card-w);
    height: var(--card-h);
    background-color: var(--card-back-b);
    background-image:
        linear-gradient(
            45deg,
            var(--card-back-a) 25%,
            transparent 25%,
            transparent 75%,
            var(--card-back-a) 75%
        ),
        linear-gradient(
            45deg,
            var(--card-back-a) 25%,
            transparent 25%,
            transparent 75%,
            var(--card-back-a) 75%
        );
    background-size: 8px 8px;
    background-position:
        0 0,
        4px 4px;
    image-rendering: pixelated;
    border: 1px solid rgba(0, 0, 0, 0.25);
    pointer-events: none;
}

/* ── Card ────────────────────────────────────────── */
.card {
    position: absolute;
    width: var(--card-w);
    height: var(--card-h);
    background: var(--card-face);
    border: 2px solid var(--card-border);
    box-shadow: 2px 2px 0 var(--shadow);
    cursor: pointer;
    image-rendering: pixelated;
    overflow: hidden;
}

.card[draggable="true"] {
    cursor: grab;
}

.card[draggable="true"]:active {
    cursor: grabbing;
}

/* Source card(s) fade while dragging */
.card.dragging {
    opacity: 0.4;
}

/* Valid drop target highlight */
.pile.drag-over {
    outline: 3px solid var(--highlight);
    outline-offset: -2px;
    background-color: var(--drop-target);
}

.card.red {
    color: var(--red);
}
.card.black {
    color: var(--black);
}

.card .rank-tl,
.card .rank-br {
    position: absolute;
    font-size: calc(var(--card-w) * 0.15);
    line-height: 1;
    padding: calc(var(--card-w) * 0.04);
}

.card .rank-tl {
    top: 2px;
    left: 3px;
}

.card .rank-br {
    bottom: 2px;
    right: 3px;
    transform: rotate(180deg);
}

.card .suit-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: calc(var(--card-w) * 0.34);
    line-height: 1;
    font-family: sans-serif;
}

/* Face-down card back — pixelated checkerboard */
.card.face-down {
    background-color: var(--card-back-b);
    background-image:
        linear-gradient(
            45deg,
            var(--card-back-a) 25%,
            transparent 25%,
            transparent 75%,
            var(--card-back-a) 75%
        ),
        linear-gradient(
            45deg,
            var(--card-back-a) 25%,
            transparent 25%,
            transparent 75%,
            var(--card-back-a) 75%
        );
    background-size: 8px 8px;
    background-position:
        0 0,
        4px 4px;
    image-rendering: pixelated;
    cursor: default;
}

.card.face-down .rank-tl,
.card.face-down .rank-br,
.card.face-down .suit-center {
    display: none;
}

/* Selected state */
.card.selected {
    outline: 3px solid var(--highlight);
    outline-offset: -1px;
    box-shadow:
        2px 2px 0 var(--shadow),
        0 0 0 3px var(--highlight);
    z-index: 500 !important;
}

/* Waste pile — show only top card at position 0 */
#waste {
    background: transparent;
    border: none;
}

/* Tableau columns grow taller than one card */
.tableau-col {
    min-height: var(--card-h);
}

/* ── Help screen ─────────────────────────────────── */
#help-screen {
    position: fixed;
    inset: 0;
    background: var(--overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

#help-screen[hidden] {
    display: none;
}

#help-box {
    background: var(--card-face);
    border: 4px solid var(--black);
    box-shadow: 6px 6px 0 var(--shadow);
    padding: 32px 36px 36px;
    width: min(600px, 90vw);
    position: relative;
    display: flex;
    flex-direction: column;
}

#help-title {
    font-size: 16px;
    color: var(--black);
    text-shadow: 2px 2px 0 white;
    letter-spacing: 2px;
    margin-bottom: 36px;
}

#help-close-btn {
    font-family: "Press Start 2P", monospace;
    font-size: 11px;
    position: absolute;
    top: 16px;
    right: 16px;
    width: 32px;
    height: 32px;
    padding: 0;
    background: var(--card-face);
    color: var(--black);
    border: 3px solid var(--black);
    box-shadow: 2px 2px 0 var(--shadow);
    cursor: pointer;
    transition:
        transform 0.05s,
        box-shadow 0.05s;
}

#help-close-btn:active {
    transform: translate(2px, 2px);
    box-shadow: 0 0 0 var(--shadow);
}

/* ── Help slider ─────────────────────────────────── */
#help-counter {
    font-size: 10px;
    color: var(--accent);
    letter-spacing: 1px;
    margin-bottom: 14px;
}

/* All slides stack in the same grid cell so the container height
   is always the tallest slide — no resize on navigation */
#help-slides {
    display: grid;
}

.help-slide {
    grid-area: 1 / 1;
    display: block;
    visibility: hidden;
}
.help-slide.active {
    visibility: visible;
}

.slide-visual {
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    height: 144px;
    background: var(--pile-empty);
    border: 2px solid var(--pile-border);
    margin-bottom: 24px;
}

.slide-title {
    font-size: 14px;
    color: var(--accent);
    letter-spacing: 2px;
    margin-bottom: 12px;
}

.slide-body {
    font-size: 11px;
    color: var(--black);
    line-height: 2.2;
}

.mini-card {
    position: relative;
    width: 40px;
    height: 56px;
    background: var(--card-face);
    border: 2px solid var(--black);
    box-shadow: 2px 2px 0 var(--shadow);
    overflow: hidden;
    flex-shrink: 0;
}

.mini-card.red {
    color: var(--red);
}

.mini-card.black {
    color: var(--black);
}

.mc-rank {
    position: absolute;
    top: 2px;
    left: 3px;
    font-size: 7px;
}

.mc-suit {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 18px;
    font-family: sans-serif;
}

.face-down-mini {
    background-color: var(--card-back-b);
    background-image:
        linear-gradient(
            45deg,
            var(--card-back-a) 25%,
            transparent 25%,
            transparent 75%,
            var(--card-back-a) 75%
        ),
        linear-gradient(
            45deg,
            var(--card-back-a) 25%,
            transparent 25%,
            transparent 75%,
            var(--card-back-a) 75%
        );
    background-size: 8px 8px;
    background-position:
        0 0,
        4px 4px;
    image-rendering: pixelated;
    cursor: default;
}

.selected-mini {
    outline: 3px solid var(--highlight);
    outline-offset: -1px;
    box-shadow:
        2px 2px 0 var(--shadow),
        0 0 0 3px var(--highlight);
}

.slide-stack {
    position: relative;
    width: 40px;
    height: 92px;
    flex-shrink: 0;
}

.slide-stack .mini-card {
    position: absolute;
}

.mini-pile {
    width: 40px;
    height: 56px;
    background: var(--pile-empty);
    border: 2px dashed var(--pile-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: var(--pile-border);
    font-family: sans-serif;
}

.mini-pile.red {
    color: var(--pile-border-red);
}

.slide-arrow {
    font-size: 16px;
    color: var(--card-face);
    font-family: sans-serif;
}

#help-dots {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 36px;
}

.help-dot {
    width: 10px;
    height: 10px;
    background: var(--dot);
    border: 2px solid var(--dot-border);
    box-shadow: 1px 1px 0 var(--shadow);
    padding: 0;
    cursor: pointer;
}

.help-dot.active {
    background: var(--accent);
    border-color: var(--black);
}

#help-nav {
    display: flex;
    justify-content: space-between;
    margin-top: auto;
    padding-top: 14px;
}

#help-prev,
#help-next {
    font-family: "Press Start 2P", monospace;
    font-size: 11px;
    padding: 10px 14px;
    background: var(--card-face);
    color: var(--black);
    border: 3px solid var(--black);
    box-shadow: 3px 3px 0 var(--shadow);
    cursor: pointer;
    image-rendering: pixelated;
    transition:
        transform 0.05s,
        box-shadow 0.05s;
}

#help-prev:active,
#help-next:active {
    transform: translate(2px, 2px);
    box-shadow: 1px 1px 0 var(--shadow);
}

#help-prev:disabled,
#help-next:disabled {
    opacity: 0.35;
    cursor: default;
}

/* ── Win screen ──────────────────────────────────── */
#win-screen {
    position: fixed;
    inset: 0;
    background: var(--overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

#win-screen[hidden] {
    display: none;
}

#win-box {
    background: var(--card-face);
    border: 4px solid var(--black);
    box-shadow: 6px 6px 0 var(--shadow);
    padding: 40px 48px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 28px;
}

#win-title {
    font-size: 20px;
    color: var(--black);
    text-shadow: 3px 3px 0 var(--red);
    letter-spacing: 3px;
}

#win-moves {
    font-size: 11px;
    color: var(--text-muted);
    letter-spacing: 1px;
}

/* ── Animations ───────────────────────────────── */

@keyframes shake {
    0%,
    100% {
        transform: translateX(0);
    }
    15% {
        transform: translateX(-8px);
    }
    30% {
        transform: translateX(8px);
    }
    45% {
        transform: translateX(-6px);
    }
    60% {
        transform: translateX(6px);
    }
    75% {
        transform: translateX(-3px);
    }
    90% {
        transform: translateX(3px);
    }
}
.card.shake {
    animation: shake 0.4s ease-out;
}

@keyframes flip-reveal {
    0% {
        opacity: 0;
        transform: translateY(-8px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}
.card.flip-reveal {
    animation: flip-reveal 0.15s ease-out both;
}

@keyframes card-land {
    0% {
        transform: scale(0.88);
        opacity: 0.7;
    }
    60% {
        transform: scale(1.05);
        opacity: 1;
    }
    100% {
        transform: scale(1);
    }
}
.card.card-land {
    animation: card-land 0.18s ease-out both;
}

@keyframes win-enter {
    0% {
        transform: scale(0.85) translateY(12px);
        opacity: 0;
    }
    65% {
        transform: scale(1.03) translateY(-2px);
    }
    100% {
        transform: scale(1) translateY(0);
    }
}
#win-box {
    animation: win-enter 0.25s ease-out both;
}

/* ── Touch drag ghost ─────────────────────────────── */
#touch-ghost {
    position: fixed;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.85;
}