:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --accent-color: #38bdf8;
    --accent-glow: rgba(56, 189, 248, 0.5);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --font-main: 'Outfit', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-main);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.app-container {
    text-align: center;
    width: 100%;
    max-width: 1200px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    height: 100vh;
    justify-content: center;
    overflow: hidden;
}

header h1 {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--text-primary), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
    letter-spacing: -1px;
}

header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.puzzle-area {
    position: relative;
    background: var(--card-bg);
    padding: 1.5rem;
    /* Increased padding */
    padding-bottom: 2rem;
    /* Ensure button fits */
    border-radius: 20px;
    box-shadow: 0 20px 50px -10px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    align-items: center;
    /* Height Handling: Allow growth but respect screen */
    max-height: 90vh;
    max-width: 100%;
}

canvas {
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    cursor: grab;
    touch-action: none;
    max-width: 100%;
    max-height: 55vh;
    /* Reduced height to leave room for controls */
    object-fit: contain;
}

canvas:active {
    cursor: grabbing;
}

#controls {
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    width: 100%;
    position: relative;
}

/* Back Button */
.back-btn {
    position: absolute;
    top: 20px;
    left: 20px;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.3s ease;
    z-index: 200;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 20px;
    background: rgba(30, 41, 59, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.back-btn:hover {
    color: var(--accent-color);
    background: rgba(30, 41, 59, 1);
    border-color: var(--accent-color);
    transform: translateX(-5px);
}

/* Premium Select - Enlarged/Modernized */
.premium-select {
    padding: 16px 32px;
    background: rgba(30, 41, 59, 0.9);
    border: 2px solid var(--accent-color);
    border-radius: 50px;
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 1.2rem;
    font-weight: 500;
    cursor: pointer;
    outline: none;
    appearance: none;
    text-align: center;
    width: 100%;
    max-width: 400px;
    background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%2338bdf8%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
    background-repeat: no-repeat;
    background-position: right 1.5rem center;
    background-size: 0.8em auto;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.premium-select:hover {
    background: rgba(30, 41, 59, 1);
    box-shadow: 0 0 15px var(--accent-glow);
    transform: translateY(-2px);
}

.premium-select option {
    background: var(--card-bg);
    color: var(--text-primary);
    font-size: 1rem;
}

.premium-btn {
    position: relative;
    padding: 12px 36px;
    background: transparent;
    border: 1px solid var(--accent-color);
    border-radius: 50px;
    color: var(--accent-color);
    font-family: var(--font-main);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    overflow: hidden;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.premium-btn:hover {
    background: var(--accent-color);
    color: var(--bg-color);
    box-shadow: 0 0 20px var(--accent-glow);
}

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

#winMessage {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    padding: 2rem 4rem;
    border-radius: 16px;
    border: 1px solid var(--accent-color);
    text-align: center;
    opacity: 0;
    pointer-events: none;
    transition: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    transform: translate(-50%, -40%) scale(0.9);
    z-index: 100;
    width: 90%;
    max-width: 400px;
}

#winMessage.visible {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, -50%) scale(1);
}

#winMessage h2 {
    font-size: 2rem;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

#winMessage p {
    color: var(--text-primary);
    margin-bottom: 2rem;
}

.hidden {
    display: none;
}

@media (max-width: 768px) {
    .app-container {
        padding: 0.5rem;
        gap: 0.5rem;
    }

    header h1 {
        font-size: 1.8rem;
    }

    header p {
        font-size: 0.8rem;
    }

    .puzzle-area {
        padding: 0.5rem;
        padding-bottom: 1rem;
        width: 100%;
        border-radius: 12px;
        max-height: 85vh;
    }

    canvas {
        max-height: 50vh;
        /* Reduced for mobile */
    }

    .premium-btn {
        padding: 10px 24px;
        font-size: 0.9rem;
    }

    .back-btn {
        top: 10px;
        left: 10px;
        font-size: 0.8rem;
        padding: 6px 12px;
    }

    .premium-select {
        padding: 12px 24px;
        font-size: 1rem;
        max-width: 100%;
        background-position: right 1rem center;
    }
}