:root {
    --bg-color: #f5f5f7;
    --text-color: #333;
    --textarea-bg: #fff;
    --textarea-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    --btn-bg: #333;
    --btn-text: #fff;
    --btn-hover: #000;
    --placeholder-color: #aaa;
    --accent-color: #888;
    --transition-speed: 0.5s;
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --textarea-bg: #2d2d2d;
    --textarea-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    --btn-bg: #e0e0e0;
    --btn-text: #1a1a1a;
    --btn-hover: #fff;
    --placeholder-color: #666;
    --accent-color: #999;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    overflow: hidden;
}

.controls {
    position: absolute;
    top: 2rem;
    right: 2rem;
    z-index: 10;
}

.icon-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-color);
    padding: 0.5rem;
    border-radius: 50%;
    transition: background-color 0.3s;
}

.icon-btn:hover {
    background-color: rgba(128, 128, 128, 0.1);
}

.icon {
    width: 24px;
    height: 24px;
}

.container {
    width: 100%;
    max-width: 800px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.input-area {
    width: 100%;
    position: relative;
    max-width: 600px;
}

textarea {
    width: 100%;
    min-height: 300px;
    background-color: var(--textarea-bg);
    color: var(--text-color);
    border: none;
    border-radius: 12px;
    padding: 2rem;
    font-size: 1.2rem;
    line-height: 1.6;
    resize: none;
    font-family: inherit;
    box-shadow: var(--textarea-shadow);
    transition: all var(--transition-speed);
    outline: none;
}

textarea:focus {
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

::placeholder {
    color: var(--placeholder-color);
    opacity: 1;
}

.release-btn {
    background-color: var(--btn-bg);
    color: var(--btn-text);
    border: none;
    padding: 1rem 3rem;
    font-size: 1rem;
    border-radius: 50px;
    cursor: pointer;
    transition: transform 0.2s, background-color 0.3s, opacity 0.3s;
    opacity: 0;
    pointer-events: none;
    transform: translateY(10px);
}

.release-btn.visible {
    opacity: 1;
    pointer-events: all;
    transform: translateY(0);
}

.release-btn:hover {
    background-color: var(--btn-hover);
    transform: translateY(-2px);
}

.release-btn:active {
    transform: translateY(0);
}

.message {
    font-size: 1.5rem;
    color: var(--accent-color);
    opacity: 0;
    transition: opacity 1s;
    position: absolute;
    bottom: 20%;
    pointer-events: none;
}

.message.show {
    opacity: 1;
    animation: fadeOut 3s forwards;
    animation-delay: 1s;
}

/* Animations */
@keyframes flyAway {
    0% {
        opacity: 1;
        transform: translateY(0) scale(1);
        filter: blur(0);
    }

    100% {
        opacity: 0;
        transform: translateY(-100px) scale(0.9);
        filter: blur(10px);
    }
}

.releasing textarea {
    animation: flyAway 1.5s ease-in forwards;
    pointer-events: none;
}

@keyframes fadeOut {
    0% {
        opacity: 1;
    }

    100% {
        opacity: 0;
    }
}

/* Particles */
#particles-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
    overflow: hidden;
}

.particle {
    position: absolute;
    border-radius: 50%;
    background: var(--text-color);
    opacity: 0.1;
    animation: float var(--float-duration) ease-in-out infinite;
    bottom: -10px;
    /* Start below screen */
}

@keyframes float {
    0% {
        transform: translateY(0) translateX(0);
        opacity: 0;
    }

    50% {
        opacity: 0.2;
    }

    100% {
        transform: translateY(-100vh) translateX(var(--drift));
        opacity: 0;
    }
}