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

:root {
    --text-color: #ffffff;
    --bg-color: #000000;
    --font-family: system-ui;
}

html, body {
    height: 100%;
    width: 100%;
    overflow: hidden;
}

body {
    background-color: var(--bg-color);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    color: var(--text-color);
    font-family: var(--font-family);
    transition: background-color 0.3s, color 0.3s;
}

#app {
    height: 100%;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

#clock-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    text-align: center;
    padding: 1rem;
}

#digital-clock {
    font-size: clamp(3rem, 20vw, 20rem);
    font-weight: 200;
    letter-spacing: 0.05em;
    font-variant-numeric: tabular-nums;
    line-height: 1;
}

#date-display {
    font-size: clamp(1rem, 4vw, 4rem);
    opacity: 0.8;
}

#analog-clock {
    max-width: 90vmin;
    max-height: 50vh;
}

.hidden {
    display: none !important;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
}

/* Settings toggle button */
#settings-toggle {
    position: fixed;
    top: 1rem;
    right: 1rem;
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    border: none;
    background: rgb(255 255 255 / 10%);
    color: var(--text-color);
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0.3;
    transition: opacity 0.3s, background 0.3s;
}

#settings-toggle:hover {
    opacity: 1;
    background: rgb(255 255 255 / 20%);
}

/* Settings panel */
#settings-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: min(100vw, 320px);
    height: 100%;
    background: rgb(0 0 0 / 95%);
    color: #fff;
    padding: 2rem;
    overflow-y: auto;
    box-shadow: -4px 0 20px rgb(0 0 0 / 50%);
}

#settings-panel h2 {
    margin-bottom: 1.5rem;
    font-weight: 400;
}

.setting-group {
    margin-bottom: 1.25rem;
}

.setting-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.setting-group input[type="checkbox"] {
    margin-right: 0.5rem;
    transform: scale(1.2);
}

.setting-group select,
.setting-group input[type="url"] {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #444;
    border-radius: 4px;
    background: #222;
    color: #fff;
    font-size: 1rem;
}

.setting-group input[type="color"] {
    width: 100%;
    height: 2.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.setting-group button {
    margin-top: 0.5rem;
    padding: 0.4rem 0.8rem;
    background: #333;
    border: 1px solid #555;
    border-radius: 4px;
    color: #fff;
    cursor: pointer;
}

.setting-group button:hover {
    background: #444;
}

#reset-settings,
#close-settings {
    width: 100%;
    margin-top: 1rem;
    padding: 0.75rem;
    background: #333;
    border: 1px solid #555;
    border-radius: 4px;
    color: #fff;
    font-size: 1rem;
    cursor: pointer;
}

#reset-settings:hover,
#close-settings:hover {
    background: #444;
}

/* QR code section */
.qr-section {
    text-align: center;
    padding-top: 1rem;
    border-top: 1px solid #444;
}

#qr-code {
    margin-top: 0.5rem;
    display: flex;
    justify-content: center;
}

#qr-code svg {
    background: #fff;
    padding: 8px;
    border-radius: 4px;
}

/* Responsive adjustments */
@media (max-width: 480px) {
    #settings-toggle {
        top: 0.5rem;
        right: 0.5rem;
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1.25rem;
    }

    #settings-panel {
        padding: 1.5rem;
    }
}

@media (min-aspect-ratio: 2/1) {
    /* Ultra-wide displays */
    #clock-display {
        flex-direction: row;
        gap: 3rem;
    }

    #digital-clock {
        font-size: clamp(3rem, 15vh, 15rem);
    }

    #date-display {
        font-size: clamp(0.75rem, 2.5vh, 2.5rem);
        align-self: center;
    }

    #analog-clock {
        max-height: 70vh;
    }
}