:root {
    /* Light Mode Variables */
    --bg-light: #f7f6f2;
    /* Off-white with a tiny warm hint */
    --text-light: #161616;
    /* Near black */
    --btn-bg-light: #0d8390;
    /* Darker Aqua */
    --btn-text-light: #ffffff;
    --slider-track-light: #b5b3a6;
    /* Increased contrast by ~20% */
    --shadow-light: rgba(0, 0, 0, 0.04);

    /* Dark Mode Variables */
    --bg-dark: #121212;
    /* Off-black */
    --text-dark: #f0f0f0;
    /* Near white */
    --btn-bg-dark: #5ee2d3;
    /* Lighter Aqua */
    --btn-text-dark: #121212;
    --slider-track-dark: #4a4a4a;
    /* Increased contrast by ~20% */
    --shadow-dark: rgba(255, 255, 255, 0.03);

    /* Typography */
    --font-serif: 'Lora', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

    /* Timing */
    --transition: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-family: var(--font-sans);
    transition: background-color var(--transition), color var(--transition);
    overflow-x: hidden;
}

/* 
 * Very subtle texture using a tiny radial gradient pattern.
 * This gives a premium "paper" or "canvas" feel without being overwhelming.
 */
body.light-mode {
    background-color: var(--bg-light);
    color: var(--text-light);
    background-image: radial-gradient(var(--shadow-light) 1px, transparent 1px);
    background-size: 20px 20px;
}

body.dark-mode {
    background-color: var(--bg-dark);
    color: var(--text-dark);
    background-image: radial-gradient(var(--shadow-dark) 1px, transparent 1px);
    background-size: 20px 20px;
}

.top-bar {
    position: absolute;
    top: 2rem;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 0 3rem;
    box-sizing: border-box;
    z-index: 100;
}

.about-container {
    position: relative;
    display: inline-block;
    cursor: help;
}

.about-label {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    opacity: 0.5;
    transition: opacity 0.3s ease;
}

.about-container:hover .about-label {
    opacity: 1;
}

.about-tooltip {
    visibility: hidden;
    position: absolute;
    top: 100%;
    left: 0;
    width: 320px;
    margin-top: 1rem;
    padding: 1.5rem;
    font-family: var(--font-serif);
    font-size: 1rem;
    line-height: 1.6;
    border-radius: 12px;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    pointer-events: none;
    z-index: 110;
}

body.light-mode .about-tooltip {
    background-color: var(--text-light);
    /* strict contrast */
    color: var(--bg-light);
}

body.dark-mode .about-tooltip {
    background-color: var(--text-dark);
    /* strict contrast */
    color: var(--bg-dark);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

.about-container:hover .about-tooltip,
.about-container.active .about-tooltip {
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
}


#theme-btn {
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: transform 0.3s ease, opacity 0.3s ease;
    opacity: 0.5;
    outline: none;
}

#theme-btn:hover {
    transform: scale(1.1) rotate(15deg);
    opacity: 1;
}

.container {
    max-width: 800px;
    width: 90%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4rem;
    z-index: 10;
}

/* Tweet Display Area */
.tweet-wrapper {
    min-height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 0 2rem;
    width: 100%;
}

.tweet-text {
    font-family: var(--font-serif);
    font-size: 2.25rem;
    line-height: 1.4;
    font-weight: 400;
    margin: 0;
    transition: opacity 0.4s ease, transform 0.4s ease;
    letter-spacing: -0.02em;
}

/* Animation classes for the tweet */
.fade-out {
    opacity: 0;
    transform: translateY(-8px);
}

.fade-in {
    opacity: 1;
    transform: translateY(0);
}

/* Controls Section */
.controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3.5rem;
    width: 100%;
    max-width: 480px;
}

/* The Cyclable Button */
.primary-btn {
    font-family: var(--font-sans);
    font-size: 1.1rem;
    font-weight: 500;
    padding: 1.25rem 3rem;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    letter-spacing: 0.02em;
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1),
        background-color var(--transition),
        color var(--transition),
        box-shadow var(--transition);
    user-select: none;
}

body.light-mode .primary-btn {
    background-color: var(--btn-bg-light);
    color: var(--btn-text-light);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

body.light-mode .primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
}

body.dark-mode .primary-btn {
    background-color: var(--btn-bg-dark);
    color: var(--btn-text-dark);
    box-shadow: 0 4px 15px rgba(255, 255, 255, 0.05);
}

body.dark-mode .primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 255, 255, 0.08);
}

.primary-btn:active {
    transform: translateY(1px) scale(0.98) !important;
}

/* Slider Container */
.slider-container {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.slider-label {
    text-align: center;
    font-size: 0.9rem;
    /* +20% */
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    opacity: 0.7;
    /* +20% (relative) */
    margin-bottom: -0.25rem;
}

.slider-track-container {
    position: relative;
    display: flex;
    align-items: center;
    height: 30px;
    /* +20% */
    width: 100%;
}

.slider-dots {
    position: absolute;
    top: 50%;
    left: 4px;
    right: 4px;
    display: flex;
    justify-content: space-between;
    transform: translateY(-50%);
    pointer-events: none;
    z-index: 0;
    margin: 0;
    padding: 0;
}

.slider-dots span {
    width: 12px;
    /* +20% */
    height: 12px;
    /* +20% */
    border-radius: 50%;
    background-color: var(--slider-track-light);
    transition: background-color var(--transition);
}

body.dark-mode .slider-dots span {
    background-color: var(--slider-track-dark);
}

/* Custom Range Slider */
.styled-slider {
    -webkit-appearance: none;
    appearance: none;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 100%;
    height: 5px;
    /* +25% thickness */
    border-radius: 3px;
    outline: none;
    background: var(--slider-track-light);
    transition: background var(--transition);
    z-index: 1;
    margin: 0;
}

body.dark-mode .styled-slider {
    background: var(--slider-track-dark);
}

.styled-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    /* ~+20% size */
    height: 22px;
    /* ~+20% size */
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), background-color var(--transition);
}

body.light-mode .styled-slider::-webkit-slider-thumb {
    background: var(--text-light);
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.15);
}

body.dark-mode .styled-slider::-webkit-slider-thumb {
    background: var(--text-dark);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.15);
}

.styled-slider::-webkit-slider-thumb:hover {
    transform: scale(1.25);
}

.styled-slider:active::-webkit-slider-thumb {
    transform: scale(0.9);
}

.temp-indicator {
    text-align: center;
    font-size: 0.9rem;
    /* +20% size */
    opacity: 0.5;
    /* Increased opacity from 0.3 */
    font-weight: 500;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.05em;
}

/* Responsive Adjustments */
@media (max-width: 600px) {
    .top-bar {
        padding: 0 1.5rem;
        top: 1.5rem;
    }

    .about-tooltip {
        width: 250px;
        font-size: 0.9rem;
        padding: 1.25rem;
        left: -10px;
        /* Adjust against screen edge */
    }

    .container {
        gap: 2.5rem;
        padding-top: 5rem;
        /* Account for top bar on small screens */
    }

    .tweet-text {
        font-size: 1.5rem;
        line-height: 1.45;
    }

    .tweet-wrapper {
        min-height: auto;
        /* Let text flow naturally */
        min-height: 200px;
        padding: 0 1rem;
    }

    .primary-btn {
        padding: 1rem 2rem;
        font-size: 1rem;
        width: 100%;
        /* Full width button on mobile */
        max-width: 300px;
    }

    .controls {
        gap: 2.5rem;
        padding-bottom: 2rem;
    }
}