/* Base Reset & Variables */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #3498db;
    --success: #27ae60;
    --dark: #2c3e50;
    --bg-gray: #f8f9fa;
    --border-color: #e9ecef;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea, #764ba2);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    background: white;
    width: 100%;
    max-width: 500px;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

/* --- Grouped Header & Footer Styles --- */
.header, .footer {
    text-align: center;
    padding: 20px;
}

.header {
    background: var(--dark);
    color: white;
}

.header h1 {
    font-size: 28px;
    margin-bottom: 5px;
}

.header p, .footer p {
    font-size: 14px;
    opacity: 0.9;
}

.footer {
    background: var(--bg-gray);
    color: #7f8c8d;
}

/* --- Main Layout (Using GAP instead of Margins) --- */
.main {
    padding: 30px;
    display: flex;
    flex-direction: column;
    gap: 25px; /* This single line replaces all the individual margin-bottoms! */
}

.password-display {
    background: var(--bg-gray);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 18px;
    font-size: 1.4rem;
    font-family: monospace;
    letter-spacing: 2px;
    min-height: 65px;
    display: flex;
    align-items: center;
    justify-content: center;
    word-break: break-all;
}

.password-display:empty::before {
    content: "Your password will appear here...";
    color: #adb5bd;
    font-size: 1rem;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* --- Strength Indicator --- */
.strength {
    display: flex;
    gap: 8px;
    margin-top: -15px; /* Pulls it closer to the display box */
}

.strength-bar {
    flex: 1;
    height: 8px;
    border-radius: 4px;
    background: var(--border-color);
    transition: all 0.3s;
}

.strength-bar.filled {
    background: var(--success);
}

.strength-text {
    font-size: 14px;
    font-weight: 600;
    text-align: center;
    margin-top: -15px;
}

/* --- Length Controls --- */
.length-control label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--dark);
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 15px;
}

input[type="range"] {
    flex: 1;
    accent-color: var(--primary);
}

.length-value {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary);
    min-width: 40px;
    text-align: center;
}

/* --- Checkbox Options --- */
.options {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.option-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    color: var(--dark);
    font-size: 16px;
}

.option-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin-right: 12px;
    accent-color: var(--primary);
}

/* --- Buttons --- */
.btn {
    width: 100%;
    padding: 15px;
    font-size: 18px;
    font-weight: 600;
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
}

/* Combined hover state saves writing darker colors manually */
.btn:hover {
    transform: translateY(-2px);
    filter: brightness(0.9);
}

.generate-btn {
    background: var(--success);
}

.copy-btn {
    background: var(--primary);
    margin-top: -10px;
}