:root {
    --bg-dark: #000000;
    --bg-gradient: linear-gradient(135deg, #02020a 0%, #151540 100%);
    --card-bg: linear-gradient(135deg, #21213d 30%, #2d2d55 90%);
    --block-bg: #3d3d6b;
    --block-hover: #4d4d7d;
    --text-main: #ffffff;
    --text-sub: #cccccc;
    --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.5);
    --text-glow: 0 0 10px rgba(255, 255, 255, 0.5);
    --font-main: "vox-round", sans-serif;
    --color-x: #4deeea;
    --color-o: #f000ff;
    --glow-x: 0 0 10px #4deeea;
    --glow-o: 0 0 10px #f000ff;
    --btn-bg: #000000;
    --btn-text: #ffffff;
    --surface-strong: rgba(0, 0, 0, 0.72);
    --surface-soft: rgba(255, 255, 255, 0.06);
    --border-soft: rgba(255, 255, 255, 0.14);
    --input-bg: rgba(0, 0, 0, 0.22);
}

[data-theme="light"] {
    --bg-gradient: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
    --card-bg: #ffffff;
    --block-bg: #e0e0e0;
    --block-hover: #e0e0e0;
    --text-main: #333333;
    --text-sub: #555555;
    --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.1);
    --color-x: #00a8a8;
    --color-o: #b800b8;
    --glow-x: none;
    --glow-o: none;
    --btn-bg: #333333;
    --btn-text: #ffffff;
    --surface-strong: rgba(255, 255, 255, 0.92);
    --surface-soft: rgba(0, 0, 0, 0.04);
    --border-soft: rgba(0, 0, 0, 0.12);
    --input-bg: rgba(255, 255, 255, 0.9);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: var(--font-main);
}

body {
    background: var(--bg-gradient);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    color: var(--text-main);
    transition: background 0.5s ease;
    padding: 24px 16px;
}

.content {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    flex-direction: column;
    gap: 20px;
}

.game {
    background: var(--card-bg);
    box-shadow: var(--shadow-card);
    border-radius: 20px;
    padding: 20px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: min(100%, 360px);
    border: 1px solid var(--border-soft);
    position: relative;
    transition: background 0.5s ease, box-shadow 0.5s ease;
}

.theme-toggle {
    position: absolute;
    top: 15px;
    right: 15px;
    background: transparent;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    z-index: 10;
    color: var(--text-main);
}

h1 {
    font-size: clamp(1.5rem, 5vw, 2rem);
    margin-bottom: 10px;
    margin-top: 10px;
}

.api-panel {
    background: var(--card-bg);
    border: 1px solid var(--border-soft);
    border-radius: 15px;
    box-shadow: var(--shadow-card);
    padding: 16px 20px;
    width: min(100%, 420px);
    transition: background 0.5s ease, box-shadow 0.5s ease;
}

.api-label {
    display: block;
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-main);
}

.api-label-note {
    font-weight: 400;
    font-size: 0.8rem;
    color: var(--text-sub);
}

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

.api-input {
    flex: 1;
    min-width: 0;
    border: 1px solid var(--border-soft);
    background: var(--input-bg);
    color: var(--text-main);
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 0.95rem;
    font-family: var(--font-main);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.api-input::placeholder {
    color: var(--text-sub);
    opacity: 0.7;
}

.api-input:focus {
    border-color: var(--color-x);
    box-shadow: 0 0 0 3px rgba(77, 238, 234, 0.15);
}

.api-save-btn {
    flex-shrink: 0;
    background-color: var(--btn-bg);
    color: var(--btn-text);
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    font-family: var(--font-main);
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    white-space: nowrap;
    transition: transform 0.1s, opacity 0.2s;
}

.api-save-btn:hover {
    opacity: 0.85;
}

.api-save-btn:active {
    transform: scale(0.95);
}

.api-status {
    font-size: 0.8rem;
    color: var(--text-sub);
    margin-top: 10px;
    min-height: 1.1rem;
}

.status {
    margin-bottom: 15px;
    font-size: 1rem;
    color: var(--text-sub);
    min-height: 1.2rem;
}

.board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    gap: 10px;
    background-color: var(--bg-dark);
    padding: 10px;
    border-radius: 15px;
    margin-bottom: 20px;
    width: 100%;
    aspect-ratio: 1/1;
    box-shadow: inset 0 0 0 1px var(--border-soft);
}

.block {
    background-color: var(--block-bg);
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: clamp(2rem, 10vw, 3rem);
    cursor: pointer;
    transition: background 0.2s;
    width: 100%;
    height: 100%;
}

.block:hover {
    background-color: var(--block-hover);
}

.block.x {
    color: var(--color-x);
    text-shadow: var(--glow-x);
}

.block.o {
    color: var(--color-o);
    text-shadow: var(--glow-o);
}

.block.taken {
    cursor: not-allowed;
}

.btn {
    background-color: var(--btn-bg);
    color: var(--btn-text);
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    font-family: var(--font-main);
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    width: 100%;
    margin-bottom: 10px;
    transition: transform 0.1s, opacity 0.2s ease;
}

.btn:hover {
    opacity: 0.9;
}

.btn:active {
    transform: scale(0.95);
}

.scoreboard {
    background: var(--card-bg);
    border-radius: 15px;
    padding: 15px;
    box-shadow: var(--shadow-card);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    width: min(100%, 420px);
    color: var(--text-main);
    border: 1px solid var(--border-soft);
    transition: background 0.5s ease, box-shadow 0.5s ease;
}

.scores {
    display: flex;
    justify-content: space-between;
    flex-direction: row;
    gap: 10px;
    margin-top: 10px;
    width: 100%;
}

.scorebox {
    background: var(--surface-strong);
    color: var(--btn-text);
    padding: 10px 12px;
    border-radius: 10px;
    min-width: 120px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 1rem;
    justify-content: center;
    align-items: center;
    border: 1px solid var(--border-soft);
}

.scorebox span {
    font-size: 1rem;
    display: block;
}

@media (max-width: 520px) {
    .game {
        padding: 18px;
    }

    .api-controls {
        flex-direction: column;
    }

    .api-save-btn {
        width: 100%;
    }

    .scores {
        flex-direction: column;
    }

    .scorebox {
        min-width: 0;
        width: 100%;
    }
}