:root {
    --primary: #667eea;
    --primary-dark: #5a67d8;
    --primary-light: #7f9cf5;
    --secondary: #f093fb;
    --danger: #f56565;
    --success: #48bb78;
    --warning: #ed8936;
    --dark: #2d3748;
    --light: #f7fafc;
    --shadow: rgba(102, 126, 234, 0.2);
    --shadow-lg: rgba(0, 0, 0, 0.15);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--dark);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

h1 {
    color: white;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 30px;
    text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.3);
    letter-spacing: 1px;
}

#game-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

body.vertical-layout #game-wrapper {
    flex-direction: row;
    align-items: center;
}

#container {
    background: white;
    border-radius: 20px;
    padding: 20px;
    box-shadow: 0 20px 60px var(--shadow-lg);
    display: inline-block;
}

canvas {
    border: none;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    cursor: crosshair;
    display: block;
}

button {
    margin: 6px;
    padding: 10px 20px;
    font-size: 0.9rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    box-shadow: 0 3px 12px var(--shadow);
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s;
}

button:hover::before {
    left: 100%;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 18px var(--shadow);
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
}

button:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px var(--shadow);
}

#tools {
    background: white;
    padding: 12px;
    border-radius: 15px;
    display: inline-block;
    box-shadow: 0 10px 30px var(--shadow-lg);
}

body.vertical-layout #tools {
    display: flex;
    flex-direction: column;
    order: 1;
}

body.vertical-layout #container {
    order: 2;
}

body.vertical-layout #color-buttons {
    display: flex;
    flex-direction: column;
    order: 3;
}

#tools button {
    width: 42px;
    height: 42px;
    margin: 4px;
    padding: 0;
    background: var(--light);
    border: 2px solid transparent;
    border-radius: 10px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

#tools button:hover {
    border-color: var(--primary);
    background: #edf2f7;
}

#tools button[data-tool="line"]::before {
    content: "";
    position: absolute;
    width: 26px;
    height: 2px;
    background: var(--dark);
    border-radius: 2px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

#tools button[data-tool="arc"]::before {
    content: "";
    position: absolute;
    width: 28px;
    height: 15px;
    border-top: 2px solid var(--dark);
    border-radius: 50% 50% 0 0;
    top: 55%;
    left: 50%;
    transform: translate(-50%, -50%);
}

#tools button[data-tool="arrow"]::before {
    content: "➤";
    font-size: 20px;
    position: absolute;
    top: 70%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--dark);
    line-height: 1;
}

#tools button[data-tool="delete"]::before {
    content: "🗑️";
    font-size: 20px;
    position: absolute;
    top: 70%;
    left: 50%;
    transform: translate(-50%, -50%);
    line-height: 1;
}

#tools button[data-tool="highlight"]::before {
    content: "✏️";
    font-size: 20px;
    position: absolute;
    top: 70%;
    left: 50%;
    transform: translate(-50%, -50%);
    line-height: 1;
}

#tools button[data-tool="player-blue"] {
    background: linear-gradient(135deg, #89d4f5 0%, #5fa8d3 100%);
    box-shadow: 0 3px 10px rgba(95, 168, 211, 0.4);
}

#tools button[data-tool="player-pink"] {
    background: linear-gradient(135deg, #fbc2eb 0%, #f093fb 100%);
    box-shadow: 0 3px 10px rgba(240, 147, 251, 0.4);
}

#color-buttons {
    background: white;
    padding: 12px;
    border-radius: 15px;
    display: inline-block;
    box-shadow: 0 10px 30px var(--shadow-lg);
}

.color-btn {
    width: 40px;
    height: 40px;
    border: 3px solid white;
    border-radius: 50%;
    margin: 4px;
    cursor: pointer;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
    outline: 2px solid transparent;
    outline-offset: 2px;
    display: inline-block;
    vertical-align: middle;
}

.color-btn[data-color="red"] {
    background: linear-gradient(135deg, #fc5c65 0%, #eb3b5a 100%);
}

.color-btn[data-color="blue"] {
    background: linear-gradient(135deg, #45aaf2 0%, #2d98da 100%);
}

.color-btn[data-color="green"] {
    background: linear-gradient(135deg, #26de81 0%, #20bf6b 100%);
}

.color-btn[data-color="orange"] {
    background: linear-gradient(135deg, #fd9644 0%, #fa8231 100%);
}

.color-btn[data-color="pink"] {
    background: linear-gradient(135deg, #fd79a8 0%, #e84393 100%);
}

.color-btn:hover {
    transform: scale(1.15);
    box-shadow: 0 5px 18px rgba(0, 0, 0, 0.25);
}

.color-btn:active {
    transform: scale(1.05);
}

button.selected,
.color-btn.selected {
    outline-color: var(--primary);
    outline-width: 3px;
    transform: scale(1.1);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.3);
}

#tools button.selected {
    border-color: var(--primary);
    background: var(--primary-light);
}

#tools button.selected::before {
    filter: brightness(0) invert(1);
}

#reset {
    background: linear-gradient(135deg, var(--danger) 0%, #e53e3e 100%);
    box-shadow: 0 3px 12px rgba(245, 101, 101, 0.3);
}

#toggleOrientation {
    background: linear-gradient(135deg, var(--success) 0%, #38a169 100%);
    box-shadow: 0 3px 12px rgba(72, 187, 120, 0.3);
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    h1 {
        font-size: 1.8rem;
        margin-bottom: 20px;
    }

    #game-wrapper {
        flex-direction: column;
    }

    body.vertical-layout #game-wrapper {
        flex-direction: column;
    }

    body.vertical-layout #tools,
    body.vertical-layout #color-buttons {
        flex-direction: row;
    }

    #container {
        overflow-x: auto;
        max-width: 100vw;
        padding: 15px;
        border-radius: 15px;
    }

    canvas {
        max-width: 90vw;
        height: auto;
    }

    button {
        padding: 8px 16px;
        font-size: 0.85rem;
        margin: 4px;
    }

    #tools,
    #color-buttons {
        padding: 8px;
    }

    #tools button {
        width: 36px;
        height: 36px;
        margin: 3px;
    }

    .color-btn {
        width: 34px;
        height: 34px;
        margin: 3px;
    }

    #toggleOrientation {
        display: none;
    }
}