:root {
    --bg-color: #0d1117;
    --container-bg: #161b22;
    --text-color: #ffffff;
    --border-color: #30363d;
}
body.light-mode {
    --bg-color: #f0f2f5;
    --container-bg: #ffffff;
    --text-color: #1c1e21;
    --border-color: #d1d9e0;
}
body {
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    font-family: -apple-system, sans-serif;
    transition: all 0.3s ease;
}
.container { max-width: 1200px; margin: 40px auto; padding: 20px; }
.header-area { display: flex; align-items: center; gap: 15px; margin-bottom: 20px; }
h1 { margin: 0; font-size: 2rem; color: #58a6ff; }
#theme-toggle { 
    background: none; border: 1px solid var(--border-color); color: var(--text-color); 
    font-size: 1.2rem; cursor: pointer; padding: 5px 10px; border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
}
.controls { display: flex; gap: 8px; margin-bottom: 30px; align-items: center; }
input {
    background: var(--container-bg); border: 1px solid var(--border-color); color: var(--text-color);
    padding: 0 15px; height: 45px; border-radius: 8px; flex: 1; font-size: 1rem; outline: none;
    box-sizing: border-box;
}
button.action-btn {
    height: 45px; padding: 0 25px; border-radius: 8px; border: none; cursor: pointer; 
    font-weight: bold; white-space: nowrap; transition: opacity 0.2s;
}
#search-btn { background: #238636; color: white; }
#reset-btn { background: #da3333; color: white; }
#main-container { display: flex; flex-wrap: wrap; gap: 20px; }