:root {
    --bg: #0a0a0a;
    --fg: #e0e0e0;
    --muted: #555;
    --border: #2a2a2a;
    --border-light: #1a1a1a;
    --accent: #3a3a5a;
    --error: #e44;
    --link: #58a6ff;
    --indent: 24px;
}

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

body {
    font-family: "Fira Code", "Cascadia Code", "Consolas", monospace;
    background: var(--bg);
    color: var(--fg);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    line-height: 1.6;
    overscroll-behavior: none;
    touch-action: none;
    overflow: hidden;
}


header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 48px;
    padding: 0 var(--indent);
    border-bottom: 1px solid var(--border);
    background: #060606;
}

header h1 {
    margin: 0;
    font-size: 14px;
    font-weight: 700;
    color: var(--fg);
    letter-spacing: 0.5px;
}

header .controls {
    display: flex;
    gap: 8px;
}

.home-btn,
.add-btn,
.clear-btn {
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--muted);
    padding: 8px 16px;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.1s;
    font-family: inherit;
    letter-spacing: 0.5px;
    font-weight: 500;
}

.home-btn:hover {
    border-color: var(--fg);
    color: var(--fg);
}

.add-btn {
    color: var(--link);
    border-color: #2a2a5a;
    background: #12152a;
}

.add-btn:hover {
    border-color: var(--link);
    color: #aaf;
    background: #1a1f3a;
}

footer {
    border-top: 1px solid var(--border);
    border-bottom: none;
    font-size: 11px;
    color: var(--muted);
    position: sticky;
    top: 100vh;
}

.clear-btn {
    color: var(--error);
    border-color: #5a2a2a;
    background: #2a1215;
}

.clear-btn:hover {
    border-color: #f88;
    color: #faa;
    background: #3a1a1f;
}

.ctrl-btn,
.sp-btn,
.btn-sm {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 5px 14px;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--muted);
    font-size: 12px;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.12s;
    border-radius: 2px;
    text-decoration: none;
}

.ctrl-btn:hover,
.sp-btn:hover,
.btn-sm:hover {
    border-color: var(--fg);
    color: var(--fg);
}

.ctrl-btn:active,
.sp-btn:active,
.btn-sm:active {
    transform: scale(0.97);
}


main {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding-top: 80px;
    min-height: 100vh;
}


.score-container {
    margin-bottom: 12px;
    text-align: center;
}

#score {
    font-size: 28px;
    font-weight: 700;
    color: var(--fg);
    font-family: "Fira Code", "Cascadia Code", "Consolas", monospace;
    letter-spacing: 0.5px;
}


.canvas-div {
    position: relative;
    width: min(90vw, 400px);
    height: min(90vw, 400px);
    touch-action: none;
}

#bgCanvas,
#tileCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 4px;
}

#bgCanvas {
    z-index: 1;
    background-color: #060606;
    border: 1px solid var(--border);
}

#tileCanvas {
    z-index: 2;
    background: transparent;
}


.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    justify-content: center;
    align-items: center;
    z-index: 2000;
}

.modal-content {
    background: var(--bg);
    border: 1px solid var(--border);
    padding: 28px 24px;
    min-width: 280px;
    max-width: 90vw;
    border-radius: 4px;
    text-align: center;
    animation: slideUp 0.3s ease both;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

.modal-content h2 {
    margin: 0 0 20px;
    font-size: 15px;
    font-weight: 600;
    color: var(--fg);
}

.modal-content p {
    font-size: 13px;
    color: var(--muted);
    margin: 0 0 16px;
}

#finalScore {
    font-weight: 700;
    color: var(--fg);
}


.close-btn {
    position: absolute;
    top: 8px;
    right: 12px;
    font-size: 20px;
    color: var(--muted);
    cursor: pointer;
    transition: color 0.12s;
    background: none;
    border: none;
    font-family: inherit;
    line-height: 1;
}

.close-btn:hover {
    color: var(--fg);
}


.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 12px;
    color: var(--muted);
    margin-bottom: 8px;
    text-align: left;
}


.choose {
    display: flex;
    flex-wrap: wrap;
    gap: 0;
    border: 1px solid var(--border);
}

.choose-card {
    flex: 1;
    min-width: 60px;
    padding: 8px 14px;
    border: none;
    border-right: 1px solid var(--border);
    background: var(--bg);
    color: var(--muted);
    font-size: 13px;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.12s;
    text-align: center;
}

.choose-card:last-child {
    border-right: none;
}

.choose-card:hover {
    background: rgba(255, 255, 255, 0.03);
    color: var(--fg);
}

.choose-card:active {
    background: var(--fg);
    color: var(--bg);
}


.sp-btn {
    margin-top: 12px;
    padding: 8px 24px;
    font-size: 13px;
    border-color: var(--accent);
    color: var(--accent);
}

.sp-btn:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--fg);
}


.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--fg);
    color: var(--bg);
    padding: 8px 20px;
    font-size: 13px;
    font-family: inherit;
    border: 1px solid var(--border);
    border-radius: 2px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
    z-index: 999;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    visibility: visible;
}


footer {
    border-top: 1px solid var(--border);
    padding: 16px var(--indent);
    font-size: 11px;
    color: var(--muted);
    text-align: center;
    background: #060606;
    margin-top: auto;
}

footer a {
    color: var(--link);
    text-decoration: none;
    transition: color 0.12s;
}

footer a:hover {
    color: var(--fg);
}


@keyframes slideUp {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes pop {
    50% { transform: scale(0.95); }
}


::-webkit-scrollbar {
    width: 4px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 2px;
}


::selection {
    background: var(--accent);
    color: #fff;
}


@media (max-width: 560px) {
    :root { --indent: 16px; }
    
    header h1 {
        font-size: 12px;
    }
    
    #score {
        font-size: 22px;
    }
    
    .modal-content {
        padding: 20px 16px;
        min-width: 260px;
    }
    
    .choose-card {
        padding: 6px 10px;
        font-size: 12px;
    }
}

@media (max-width: 400px) {
    header {
        padding: 0 12px;
    }
    
    .ctrl-btn {
        padding: 4px 10px;
        font-size: 11px;
    }
}