:root {
    --bg-color: #000000;
    --bg-gradient: linear-gradient(180deg, #000000 0%, #0a0a0a 100%);
    --card-bg: #111111;
    --card-border: #333333;
    --border-color: #333333;
    --text-primary: #ffffff;
    --text-secondary: #888888;
    --accent-color: #ffffff;
    --accent-gradient: linear-gradient(135deg, #ffffff 0%, #cccccc 100%);
    --font-main: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.7);
    --glow: 0 0 40px rgba(255, 255, 255, 0.05);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: var(--bg-gradient);
    color: var(--text-primary);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.02) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.02) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    z-index: 1;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 25px;
    box-shadow: var(--shadow-lg), var(--glow);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.card:hover {
    border-color: #555555;
    box-shadow: var(--shadow-lg), 0 0 60px rgba(255, 255, 255, 0.05);
}

h1 {
    text-align: center;
    color: #ffffff;
    margin-bottom: 5px;
    font-size: 2.8rem;
    font-weight: 800;
    letter-spacing: -2px;
}

h1 span {
    font-weight: 300;
    color: #888888;
}

h2 {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 1rem;
    font-weight: 400;
}

.toggle-group {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.toggle-btn {
    flex: 1;
    padding: 12px;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.toggle-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.toggle-btn.active {
    background: #ffffff;
    color: #000000;
    border-color: #ffffff;
}

.input-group {
    margin-bottom: 15px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.input-group input[type="number"] {
    width: 100%;
    background: rgba(10, 10, 10, 0.6);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 14px 16px;
    border-radius: 10px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.input-group input[type="number"]:focus {
    outline: none;
    border-color: #ffffff;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1);
    background: rgba(10, 10, 10, 0.8);
}

.input-with-button {
    display: flex;
    gap: 10px;
}

.input-with-button input[type="number"] {
    flex: 1;
}

.generate-small-btn {
    padding: 14px 20px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    white-space: nowrap;
}

.generate-small-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: #ffffff;
}

.checkbox-group {
    margin-bottom: 15px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    color: var(--text-primary);
}

.checkbox-label input[type="checkbox"] {
    margin-right: 10px;
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: #ffffff;
}

.checkbox-label span {
    font-size: 0.9rem;
}

.generate-btn {
    width: 100%;
    padding: 16px 32px;
    background: #ffffff;
    color: #000000;
    border: none;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(255, 255, 255, 0.1);
    margin-bottom: 25px;
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(255, 255, 255, 0.2);
    background: #e0e0e0;
}

.generate-btn:active {
    transform: translateY(0);
}

.output-group {
    margin-bottom: 15px;
}

.output-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.password-display {
    display: flex;
    gap: 10px;
}

.password-display input[type="text"] {
    flex: 1;
    background: rgba(10, 10, 10, 0.6);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 14px 16px;
    border-radius: 10px;
    font-size: 0.9rem;
    font-family: var(--font-mono);
    transition: all 0.3s ease;
}

.password-display input[type="text"]:focus {
    outline: none;
    border-color: #ffffff;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1);
    background: rgba(10, 10, 10, 0.8);
}

.action-btn {
    padding: 14px 20px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    white-space: nowrap;
}

.action-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: #ffffff;
}

.strength-indicator {
    margin-top: 15px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.strength-bar {
    flex: 1;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
}

.strength-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #ff4444 0%, #ff4444 33%, #ffaa00 33%, #ffaa00 66%, #44ff44 66%, #44ff44 100%);
    transition: width 0.3s ease, background 0.3s ease;
    border-radius: 4px;
}

.strength-text {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
    white-space: nowrap;
    min-width: 80px;
}

.email-container {
    text-align: center;
    margin-top: 40px;
    margin-bottom: 20px;
}

.email-link {
    display: inline-block;
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.85rem;
    transition: all 0.3s ease;
}

.email-link:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: #ffffff;
}

footer {
    margin-top: auto;
    padding: 40px 20px;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    width: 100%;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
    text-align: left;
}

.footer-section {
    flex: 1;
    min-width: 200px;
}

.footer-section h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 15px;
}

.footer-section p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.footer-nav {
    list-style: none;
    padding: 0;
}

.footer-nav li {
    margin-bottom: 8px;
}

.footer-nav a {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-nav a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    grid-column: 1 / -1;
    text-align: center;
    padding-top: 30px;
    margin-top: 30px;
    border-top: 1px solid var(--border-color);
}

/* Author link in header */

.author-link {
    color: var(--accent-color);
    font-weight: 600;
    text-decoration: underline;
}

.author-link:hover {
    text-decoration: underline;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

.card-footer .copyright {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.card-footer-links {
    display: flex;
    gap: 15px;
}

.card-footer-links a {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.card-footer-links a:hover {
    color: var(--text-primary);
}

.how-to-link {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.how-to-link:hover {
    color: var(--text-primary);
}