:root {
    --bg-dark: #121212;
    --card-bg: #1e1e1e;
    --text-light: #f0f0f0;
    --text-muted: #b0b0b0;
    --accent-main: #007bff;
    --accent-secondary: #007bff;
    --border-color: rgba(255, 255, 255, 0.08);
    --shadow-color: rgba(0, 0, 0, 0.4);
    --font-primary: 'Inter', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: var(--font-primary);
}

body {
    background: var(--bg-dark);
    color: var(--text-light);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    padding-top: 70px;
    /* Space for fixed nav */
    line-height: 1.6;
    font-size: 15px;
    /* Slightly smaller base font size */
}

/* Start Navigation Bar */
nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(18, 18, 18, 0.95);
    /* Darker, slightly transparent */
    backdrop-filter: blur(8px);
    box-shadow: 0 2px 10px var(--shadow-color);
    z-index: 1000;
    padding: 12px 20px;
    /* Slightly more padding */
    display: flex;
    justify-content: center;
    align-items: center;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 25px;
    /* Slightly less gap */
}

nav a {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    padding: 6px 0;
    position: relative;
    transition: color 0.3s ease;
    font-size: 0.95em;
    /* Slightly smaller nav text */
}

nav a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -4px;
    /* Move underline down */
    width: 0;
    height: 2px;
    background-color: var(--accent-main);
    transition: width 0.3s ease;
}

nav a:hover {
    color: var(--accent-main);
}

nav a:hover::after {
    width: 100%;
}


.main-container {
    width: 100%;
    max-width: 450px;
    background: var(--card-bg);
    border-radius: 10px;
    box-shadow: 0 6px 15px var(--shadow-color);
    padding: 20px;
    border: 1px solid var(--border-color);
    margin-bottom: 25px;
}

/* End Main Container */

/* Start Header Section */
.header {
    text-align: center;
    margin-bottom: 15px;
}

.logo-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.logo-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-light);
    background: linear-gradient(45deg, var(--accent-main), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title {
    font-size: 1.7rem;
    font-weight: 600;
    color: var(--text-light);
    margin-bottom: 8px;
}

.description {
    color: var(--text-muted);
    font-size: 0.85em;
    max-width: 380px;
    margin: 0 auto;
}

/* End Header Section */

/* Start Password Box */
.password-box {
    background: #1a1a1a;
    /* Darker input background */
    border-radius: 8px;
    padding: 10px;
    margin-bottom: 12px;
    border: 1px solid rgba(0, 123, 255, 0.3);
    /* Blue border */
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 45px;
    /* Slightly smaller height */
}

#password-output {
    font-size: 1em;
    word-break: break-all;
    color: #ffffff;
    flex-grow: 1;
    font-weight: 500;
    padding-right: 8px;
}

.copy-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-light);
    font-size: 0.9em;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: color 0.3s ease;
    position: relative;
}

.copy-btn:hover {
    color: var(--accent-main);
}

.copy-tooltip {
    position: absolute;
    right: 100%;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(0, 0, 0, 0.7);
    color: #fff;
    padding: 4px 8px;
    border-radius: 4px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    font-size: 0.8em;
}

.copy-btn:hover .copy-tooltip {
    opacity: 1;
    visibility: visible;
}

.copy-icon,
.copy-checkmark {
    width: 18px;
    height: 18px;
    vertical-align: middle;
}

.copy-checkmark {
    display: none;
    color: #28a745;
}

/* End Password Box */

/* Start Strength Indicator */
.strength-bar {
    height: 6px;
    /* Slightly thinner */
    background: rgba(255, 0, 0, 0.2);
    /* Lighter red background */
    border-radius: 3px;
    margin-bottom: 8px;
    overflow: hidden;
}

.strength-progress {
    height: 100%;
    width: 0;
    border-radius: 3px;
    transition: width 0.5s ease, background 0.5s ease;
}

.strength-text {
    text-align: left;
    font-size: 0.85em;
    color: var(--text-muted);
    margin-bottom: 18px;
}

/* End Strength Indicator */

/* Start Settings Section */
.settings {
    background: #1a1a1a;
    /* Darker settings background */
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}

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

.setting-group:last-child {
    margin-bottom: 0;
}

.setting-title {
    font-size: 1em;
    color: var(--text-light);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 500;
}

.setting-title i {
    color: var(--accent-main);
}

.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    /* Slightly smaller min-width */
    gap: 8px;
}

.checkbox-option {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 7px 10px;
    /* Slightly less padding */
    background: #252525;
    /* Darker checkbox background */
    border-radius: 6px;
    transition: all 0.3s ease;
    cursor: pointer;
    border: 1px solid transparent;
}

.checkbox-option:hover {
    border-color: var(--accent-main);
    background: #2f2f2f;
}

.checkbox-option input[type="checkbox"] {
    appearance: none;
    width: 16px;
    /* Slightly smaller checkbox */
    height: 16px;
    border: 2px solid var(--text-muted);
    border-radius: 3px;
    position: relative;
    cursor: pointer;
    transition: all 0.3s ease;
}

.checkbox-option input[type="checkbox"]:checked {
    background-color: var(--accent-main);
    border-color: var(--accent-main);
}

.checkbox-option input[type="checkbox"]:checked::before {
    content: '\f00c';
    /* Font Awesome check icon */
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    color: white;
    font-size: 10px;
    /* Smaller checkmark */
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.checkbox-option label {
    color: var(--text-light);
    font-size: 0.9em;
    cursor: pointer;
}

.length-setting {
    display: flex;
    align-items: center;
    gap: 12px;
    background: #252525;
    padding: 8px 12px;
    border-radius: 6px;
    border: 1px solid transparent;
    transition: border-color 0.3s ease;
}

.length-setting:hover {
    border-color: var(--accent-main);
}

.length-setting input[type="range"] {
    flex-grow: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    background: #4a4a6a;
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

.length-setting input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent-main);
    border-radius: 50%;
    cursor: grab;
    box-shadow: 0 0 4px rgba(0, 0, 0, 0.3);
    transition: background 0.3s ease;
}

.length-setting input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--accent-main);
    border-radius: 50%;
    cursor: grab;
    box-shadow: 0 0 4px rgba(0, 0, 0, 0.3);
    transition: background 0.3s ease;
}

.length-setting input[type="range"]::-webkit-slider-thumb:active,
.length-setting input[type="range"]::-moz-range-thumb:active {
    cursor: grabbing;
}

.length-display {
    font-size: 1em;
    font-weight: 500;
    color: var(--accent-main);
    min-width: 28px;
    text-align: center;
}

.action-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px;
    margin-bottom: 20px;
}

.action-buttons button {
    font-size: 1em;
    padding: 10px 18px;
    min-width: 120px;
    border-radius: 8px;
    transition: transform 0.3s ease;
}

@media (min-width: 768px) {
    .action-buttons button {
        font-size: 1.1em;
        padding: 8px 8px;
        min-width: 140px;
    }
}

@media (max-width: 480px) {
    .action-buttons {
        justify-content: space-between;
    }

    .action-buttons button {
        flex: 1 1 calc(33.333% - 8px);
        min-width: unset;
        font-size: 0.9em;
        padding: 8px 12px;
    }
}

.action-btn {
    background: linear-gradient(45deg, var(--accent-main), var(--accent-secondary));
    color: white;
    border: none;
    padding: 10px 15px;
    /* Slightly less padding */
    border-radius: 6px;
    font-size: 0.95em;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.2);
}

.action-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: 0 5px 12px rgba(0, 0, 0, 0.3);
}

.action-btn i {
    font-size: 1em;
}

.btn-copy {
    background: #34495e;
    /* Darker blue-grey */
}

.btn-copy:hover {
    background: #2c3e50;
}

.btn-download {
    background: #27ae60;
    /* Green */
}

.btn-download:hover {
    background: #229a54;
}

/* End Action Buttons */

/* Start Security Tips Section */
.tips-section {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 15px;
    border: 1px solid var(--border-color);
}

.tips-toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    padding: 5px 0;
}

.tips-toggle h2 {
    font-size: 1em;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 500;
}

.tips-toggle h2 i {
    color: var(--accent-main);
}

.tips-arrow {
    transition: transform 0.3s ease;
}

.tips-list {
    margin-top: 15px;
    border-top: 1px solid var(--border-color);
    padding-top: 15px;
}

.tips-list.hidden {
    display: none;
}

.tips-list.expanded .tips-arrow {
    transform: rotate(180deg);
}

.tip-item {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 8px;
    color: var(--text-muted);
    font-size: 0.85em;
}

.tip-item i {
    color: #28a745;
    margin-top: 2px;
}

.more-info-toggle {
    color: var(--accent-main);
    cursor: pointer;
    font-size: 0.85em;
    margin-top: 10px;
    display: inline-block;
    transition: color 0.3s ease;
}

.more-info-toggle:hover {
    color: #6a93cb;
}

.more-info {
    margin-top: 10px;
    padding: 10px;
    background: #252525;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.more-info.hidden {
    display: none;
}

.more-info p {
    color: var(--text-muted);
    font-size: 0.8em;
    margin-bottom: 4px;
}

.more-info p:last-child {
    margin-bottom: 0;
}

/* End Security Tips Section */

/* Start Alerts Section */
.alert {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: #28a745;
    color: white;
    padding: 10px 18px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.95em;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: 1001;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
}

.alert.show {
    opacity: 1;
    visibility: visible;
}

.alert i {
    font-size: 1.1em;
}

/* End Alerts Section */



.badge {
    background-color: #252525;
    color: var(--text-light);
    padding: 4px 10px;
    border-radius: 18px;
    font-size: 0.7em;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

/* End Footer Styles */

/* Start Responsive Adjustments */
@media (max-width: 768px) {
    body {
        padding-top: 60px;
    }

    nav {
        padding: 10px 15px;
    }

    nav ul {
        gap: 15px;
    }

    nav a {
        font-size: 0.9em;
    }

    .main-container {
        padding: 15px;
    }

    .title {
        font-size: 1.5rem;
    }

    .logo-title {
        font-size: 1.4rem;
    }

    .footer-content {
        grid-template-columns: 1fr 1fr;
    }

    .footer-brand {
        grid-column: span 2;
        text-align: center;
    }

    .footer-brand .brand-logo {
        justify-content: center;
    }

    .footer-brand .social-links {
        justify-content: center;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .footer-badges {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
        padding-top: 50px;
    }

    nav {
        padding: 8px 10px;
    }

    nav ul {
        gap: 10px;
        flex-wrap: wrap;
    }

    nav a {
        font-size: 0.85em;
    }

    .main-container {
        padding: 12px;
    }

    .title {
        font-size: 1.3rem;
    }

    .logo-title {
        font-size: 1.2rem;
    }

    .description {
        font-size: 0.75em;
    }

    .password-box {
        flex-direction: column;
        align-items: stretch;
    }

    #password-output {
        text-align: center;
        margin-bottom: 8px;
        padding-right: 0;
    }

    .copy-btn {
        justify-content: center;
    }

    .action-buttons {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .footer-section h3 {
        text-align: center;
    }

    .footer-section h3::after {
        left: 50%;
        transform: translateX(-50%);
    }

    .footer-links {
        text-align: center;
    }
}