:root {
    --primary-color: #00ffea;
    /* neon cyan */
    --secondary-color: #ff00ff;
    /* neon magenta / vibrant */
    --bg-color: #0d0d0d;
    /* dark background */
    --text-color: #e0e0e0;
    --card-bg: #1a1a1a;
    --card-shadow: rgba(0, 255, 234, 0.2);
    --header-gradient: linear-gradient(90deg, #00ffea, #ff00ff);
    /* cyan → magenta */
}

[data-theme="light"] {
    --primary-color: #00bcd4;
    /* soft cyan */
    --secondary-color: #d500f9;
    /* vibrant purple */
    --bg-color: #f4f4f8;
    --text-color: #1a1a1a;
    --card-bg: #ffffff;
    --card-shadow: rgba(0, 188, 212, 0.2);
    --header-gradient: linear-gradient(90deg, #00bcd4, #d500f9);
    /* cyan → purple */
}

[data-theme="dark"] {
    --primary-color: #00ffea;
    /* neon cyan */
    --secondary-color: #ff00ff;
    /* neon magenta / vibrant */
    --bg-color: #0d0d0d;
    /* dark background */
    --text-color: #e0e0e0;
    --card-bg: #1a1a1a;
    --card-shadow: rgba(0, 255, 234, 0.2);
    --header-gradient: linear-gradient(90deg, #00ffea, #ff00ff);
    /* cyan → magenta */
}

* {
    box-sizing: border-box;
    transition: all 0.3s ease-in-out;
}

a {
    text-decoration: none;
}

a:hover {
    color: cyan;
}

body {
    font-family: 'Orbitron', sans-serif;
    /* sci-fi font */
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--header-gradient);
    color: white;
    text-shadow: 0 0 10px var(--primary-color);
    border-radius: 0.5rem;
}

header h1 {
    font-size: 1.5rem;
}

#search-bar {
    padding: 0.7rem 1rem;
    border-radius: 999px;
    border: none;
    width: 250px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-color);
    outline: none;
    box-shadow: 0 0 15px rgba(0, 255, 234, 0.2);
}

#search-bar::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

main {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem;
}

footer {
    text-align: center;
    padding: 2rem;
    font-size: 0.9rem;
    color: var(--text-color);
    text-shadow: 0 0 5px var(--primary-color);
}

#theme-btn {
    background-color: transparent;
    border: none;
}