:root {
    --bg-gradient: linear-gradient(to bottom, #2b5876, #4e4376);
    /* Deep calming blue/purple */
    --text-color: #ffffff;
    --fail-color: #e74c3c;
    --success-color: #2ecc71;
    --font-main: 'Montserrat', sans-serif;
}

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

body {
    font-family: var(--font-main);
    background: var(--bg-gradient);
    color: var(--text-color);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    overflow: hidden;
    user-select: none;
    /* Prevent selection */
}

.container {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.content {
    z-index: 1;
    transition: opacity 0.5s;
}

h1 {
    font-weight: 100;
    font-size: 2rem;
    margin-bottom: 2rem;
    letter-spacing: 2px;
    opacity: 0.8;
}

#timer {
    font-size: 8rem;
    font-weight: 300;
    margin-bottom: 2rem;
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
    font-variant-numeric: tabular-nums;
}

.instruction {
    font-weight: 300;
    opacity: 0.6;
    max-width: 400px;
    line-height: 1.6;
}

/* Overlays */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.overlay:not(.hidden) {
    opacity: 1;
    pointer-events: auto;
}

.overlay-content {
    transform: translateY(20px);
    transition: transform 0.3s;
}

.overlay:not(.hidden) .overlay-content {
    transform: translateY(0);
}

#fail-overlay h2 {
    color: var(--fail-color);
    font-size: 3rem;
    font-weight: 100;
    margin-bottom: 1rem;
}

#success-overlay h2 {
    color: var(--success-color);
    font-size: 3rem;
    font-weight: 100;
    margin-bottom: 1rem;
}

button {
    background: transparent;
    border: 1px solid white;
    color: white;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-family: var(--font-main);
    cursor: pointer;
    margin-top: 2rem;
    transition: all 0.3s;
    text-transform: uppercase;
    letter-spacing: 2px;
}

button:hover {
    background: white;
    color: #4e4376;
}

footer {
    position: absolute;
    bottom: 2rem;
    font-size: 0.8rem;
    opacity: 0.3;
}

/* Mobile adjustments */
@media (max-width: 600px) {
    #timer {
        font-size: 5rem;
    }

    h1 {
        font-size: 1.5rem;
    }
}