:root {
    --primary-color: #00ff00;
    --bg-color: #1a1a1a;
    --container-bg: #242424;
    --text-color: #00ff00;
    --disabled-color: #666;
}

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

body {
    margin: 0;
    padding: 15px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Courier New', monospace;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.clock-container {
    background-color: var(--container-bg);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 255, 0, 0.2);
    text-align: center;
    width: 100%;
    max-width: 800px;
    position: relative;
}

.mode-toggle {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: transparent;
    color: var(--text-color);
    border: 1px solid var(--text-color);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    transition: all 0.3s;
}

.mode-toggle:hover {
    background-color: var(--text-color);
}

.mode-toggle:hover svg {
    fill: var(--container-bg);
}

.mode-toggle svg {
    width: 20px;
    height: 20px;
    fill: var(--text-color);
    transition: fill 0.3s;
}

.time {
    font-size: clamp(2.5rem, 10vw, 5rem);
    font-weight: bold;
    text-shadow: 0 0 10px rgba(0, 255, 0, 0.5);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.date {
    font-size: clamp(1.2rem, 4vw, 1.5rem);
    margin-bottom: 0.5rem;
    transition: opacity 0.3s;
}

.hidden {
    display: none !important;
}

.festival {
    color: #ff3366;
    font-size: clamp(1rem, 3vw, 1.2rem);
    height: 1.5em;
    margin-top: 1rem;
}

.divider {
    width: 100%;
    height: 2px;
    background: linear-gradient(to right, transparent, var(--text-color), transparent);
    margin: 1rem 0;
}

.label {
    color: var(--disabled-color);
    font-size: clamp(0.7rem, 2vw, 0.8rem);
    margin-bottom: 0.3rem;
}

.controls {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin: 1rem auto;
    opacity: 1;
    transition: opacity 0.3s ease;
    flex-wrap: wrap;
    max-width: 450px;
}

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

.btn {
    background-color: #333;
    color: var(--text-color);
    border: 1px solid var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 5px;
    cursor: pointer;
    font-family: 'Courier New', monospace;
    transition: all 0.3s;
    font-size: clamp(0.8rem, 2.5vw, 0.9rem);
    position: relative;
    flex: 1;
    min-width: max-content;
    white-space: nowrap;
}

.btn:hover:not(.disabled) {
    background-color: var(--text-color);
    color: var(--container-bg);
}

.btn.active:not(.disabled) {
    background-color: var(--text-color);
    color: var(--container-bg);
}

.btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    border-color: var(--disabled-color);
    color: var(--disabled-color);
}

.btn.disabled::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 120%;
    left: 50%;
    transform: translateX(-50%);
    padding: 4px 8px;
    background-color: #333;
    color: var(--text-color);
    border-radius: 4px;
    font-size: 0.8rem;
    white-space: nowrap;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
    z-index: 10;
}

.btn.disabled:hover::after {
    opacity: 1;
}

.meridiem {
    font-size: clamp(1.5rem, 5vw, 2rem);
    color: var(--text-color);
}

.btn-group {
    display: flex;
    gap: 0.5rem;
    margin: 0.5rem;
    flex: 1;
    min-width: 140px;
    justify-content: center;
}

@media (max-width: 480px) {
    .btn-group {
        min-width: 45%;
    }

    .btn {
        padding: 0.4rem 0.8rem;
    }

    .clock-container {
        padding: 1.5rem;
    }

    .controls {
        gap: 0.3rem;
    }
}

@media (max-width: 360px) {
    .btn-group {
        min-width: 100%;
    }
}

.toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--text-color);
    color: var(--container-bg);
    padding: 10px 20px;
    border-radius: 5px;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
    z-index: 1000;
    font-size: clamp(0.8rem, 2.5vw, 1rem);
    text-align: center;
    white-space: nowrap;
}

.toast.show {
    opacity: 1;
}

#share-btn svg {
    width: clamp(12px, 3vw, 14px);
    height: clamp(12px, 3vw, 14px);
    vertical-align: middle;
    margin-right: 4px;
    margin-bottom: 4px;
}