:root {
    --black: #0a0a0a;
    --dark-grey: #1a1a1a;
    --mid-grey: #333333;
    --silver: #c0c0c0;
    --white-silver: #e0e0e0;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', sans-serif; }

body {
    background-color: var(--black);
    color: var(--white-silver);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    background: linear-gradient(145deg, #1a1a1a, #0f0f0f);
    padding: 40px;
    border-radius: 12px;
    border: 1px solid var(--mid-grey);
    width: 100%;
    max-width: 420px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.8);
}

h1 { font-weight: 300; letter-spacing: 2px; margin-bottom: 5px; }
h1 span { font-weight: 700; color: var(--silver); }
header p { font-size: 0.8rem; color: #666; margin-bottom: 30px; text-transform: uppercase; }

/* Display Section */
.display-box {
    display: flex;
    background: var(--black);
    border: 1px solid var(--mid-grey);
    border-radius: 6px;
    padding: 10px;
    margin-bottom: 25px;
}

#password-display {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--silver);
    font-family: 'Courier New', monospace;
    font-size: 1.2rem;
    padding-left: 10px;
}

#copy-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    filter: grayscale(1);
    transition: 0.3s;
}

#copy-btn:hover { filter: grayscale(0); transform: scale(1.1); }

/* Settings Section */
.setting-item { margin-bottom: 20px; }
label { display: block; margin-bottom: 10px; font-size: 0.9rem; color: var(--silver); }

input[type="range"] {
    width: 100%;
    accent-color: var(--silver);
    cursor: pointer;
}

.options { margin-bottom: 30px; }
.check-item {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    cursor: pointer;
}

#generate-btn {
    width: 100%;
    padding: 15px;
    background: var(--silver);
    color: var(--black);
    border: none;
    border-radius: 4px;
    font-weight: 700;
    letter-spacing: 1px;
    cursor: pointer;
    transition: 0.3s;
}

#generate-btn:hover { background: var(--white-silver); }