:root {
    --primary-bg: #1a1a2e;
    --secondary-bg: #16213e;
    --accent-color: #0f3460;
    --primary-text: #e94560;
    --secondary-text: #dcdcdc;
    --line-number-bg: #1f2847;
    --scrollbar-thumb: #e94560;
    --scrollbar-track: #16213e;
    --button-bg: #e94560;
    --button-text: #ffffff;
    --button-hover-bg: #c63a50;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--primary-bg);
    color: var(--secondary-text);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 900px;
    background-color: var(--secondary-bg);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    padding: 30px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    animation: fadeIn 0.8s ease-in-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

header {
    text-align: center;
    border-bottom: 1px solid var(--accent-color);
    padding-bottom: 20px;
}

header h1 {
    color: var(--primary-text);
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 5px;
}

header p {
    font-size: 1rem;
    font-weight: 300;
}

main {
    display: flex;
    gap: 20px;
    height: 60vh;
}

.editor {
    flex: 3;
    display: flex;
    position: relative;
    background-color: var(--primary-bg);
    border-radius: 10px;
    overflow: hidden;
}

.line-numbers {
    background-color: var(--line-number-bg);
    padding: 20px 10px;
    font-size: 1rem;
    line-height: 1.7;
    text-align: right;
    color: var(--secondary-text);
    user-select: none;
    border-right: 1px solid var(--accent-color);
}

#lyric-textarea {
    flex: 1;
    resize: none;
    border: none;
    outline: none;
    background-color: transparent;
    color: var(--secondary-text);
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    line-height: 1.7;
    padding: 20px;
    width: 100%;
}

.syllable-counts {
    flex: 1;
    background-color: var(--primary-bg);
    border-radius: 10px;
    padding: 20px;
    overflow-y: auto;
    font-size: 1rem;
    line-height: 1.7;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.syllable-counts div {
    display: flex;
    justify-content: space-between;
    padding: 0 10px;
    border-radius: 5px;
    transition: background-color 0.3s;
}

.syllable-counts div:nth-child(odd) {
    background-color: var(--accent-color);
}

.syllable-counts .line-text {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--secondary-text);
}

.syllable-counts .count {
    font-weight: 600;
    color: var(--primary-text);
    animation: countUpdate 0.5s ease-in-out;
}

@keyframes countUpdate {
    from {
        transform: scale(1.5);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

footer {
    display: flex;
    justify-content: flex-end;
    gap: 15px;
    border-top: 1px solid var(--accent-color);
    padding-top: 20px;
}

button {
    background-color: var(--button-bg);
    color: var(--button-text);
    border: none;
    padding: 12px 25px;
    border-radius: 8px;
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
}

button:hover {
    background-color: var(--button-hover-bg);
    transform: translateY(-2px);
}

button:active {
    transform: translateY(0);
}

::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--button-hover-bg);
}

@media (max-width: 768px) {
    main {
        flex-direction: column;
        height: auto;
    }

    .editor, .syllable-counts {
        height: 40vh;
    }

    header h1 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    .container {
        padding: 20px;
    }

    footer {
        flex-direction: column;
        gap: 10px;
    }

    button {
        width: 100%;
    }
}