/* General Body and Base Styles */
:root {
    /* Light Mode Variables */
    --bg-color: #e0f2f7;
    --text-color: #333;
    --container-bg: #fff;
    --container-shadow: rgba(0, 0, 0, 0.1);
    --header-bg: #f8f8f8;
    --header-text: #2c3e50;
    --link-color: #3498db;
    --link-hover-color: #2980b9;
    --result-bg: #ecf0f1;
    --result-border: #bdc3c7;
    --result-text: #34495e;
    --button-bg: #3498db;
    --button-hover-bg: #2980b9;
    --setting-label-color: #555;
    --error-color: #e74c3c;
    --meter-none: #ccc;
    --meter-weak: #e74c3c;
    --meter-medium: #f1c40f;
    --meter-strong: #2ecc71;
    --footer-bg: #f8f8f8;
    --footer-text: #777;
    --info-section-bg: #fff;
    --info-section-shadow: rgba(0, 0, 0, 0.05);
    --focus-ring-color: rgba(52, 152, 219, 0.5); /* For accessibility */
}

body.dark-mode {
    /* Dark Mode Variables */
    --bg-color: #2c3e50;
    --text-color: #ecf0f1;
    --container-bg: #34495e;
    --container-shadow: rgba(0, 0, 0, 0.3);
    --header-bg: #22303c;
    --header-text: #ecf0f1;
    --link-color: #85c1e9;
    --link-hover-color: #5dade2;
    --result-bg: #49637c;
    --result-border: #607d8b;
    --result-text: #ecf0f1;
    --button-bg: #5dade2;
    --button-hover-bg: #3498db;
    --setting-label-color: #bdc3c7;
    --error-color: #f08080;
    --meter-none: #7f8c8d;
    --meter-weak: #e74c3c;
    --meter-medium: #f1c40f;
    --meter-strong: #2ecc71;
    --footer-bg: #22303c;
    --footer-text: #9bb7d2;
    --info-section-bg: #34495e;
    --info-section-shadow: rgba(0, 0, 0, 0.2);
    --focus-ring-color: rgba(133, 193, 233, 0.5);
}

/* Base Styles */
body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Accessibility: Skip Link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background-color: var(--link-color);
    color: white;
    padding: 8px;
    z-index: 1000;
    transition: top 0.3s ease-in-out;
}
.skip-link:focus {
    top: 0;
}

/* Universal Focus Style */
*:focus {
    outline: 3px solid var(--focus-ring-color);
    outline-offset: 2px;
}
/* Remove focus ring for elements with custom visual focus (e.g., checkboxes) */
input[type="checkbox"]:focus {
    outline: none;
}

a {
    color: var(--link-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--link-hover-color);
    text-decoration: underline;
}

/* Header Styles */
header {
    background-color: var(--header-bg);
    color: var(--header-text);
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    flex-wrap: wrap;
    transition: background-color 0.3s ease, color 0.3s ease;
}

header.logo a {
    font-size: 1.5em;
    font-weight: bold;
    color: var(--header-text);
    text-decoration: none;
}

header nav {
    display: flex;
    align-items: center;
}

header nav.menu-toggle {
    display: none; /* Hidden on desktop */
    background: none;
    border: none;
    color: var(--header-text);
    font-size: 1.5em;
    cursor: pointer;
    padding: 5px;
}

header nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
}

header nav ul li {
    margin-left: 25px;
}

header nav ul li a {
    color: var(--header-text);
    font-weight: 500;
    position: relative;
    padding-bottom: 5px;
}

header nav ul li a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    display: block;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    background: var(--link-color);
    transition: width 0.3s ease;
}

header nav ul li a:hover::after,
header nav ul li a:focus::after { /* Add focus state */
    width: 100%;
    background: var(--link-hover-color);
}

/* Dark Mode Toggle Switch */
.theme-switch {
    display: flex;
    align-items: center;
    margin-left: 20px;
}

.checkbox {
    opacity: 0;
    position: absolute;
}

.toggle-label {
    background-color: #111;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-radius: 50px;
    position: relative;
    padding: 5px;
    height: 26px;
    width: 50px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.toggle-label.fas.fa-moon {
    color: #f1c40f;
    font-size: 1.2em;
    margin-left: 3px;
}
.toggle-label.fas.fa-sun {
    color: #f39c12;
    font-size: 1.2em;
    margin-right: 3px;
}

.ball {
    background-color: #fff;
    border-radius: 50%;
    position: absolute;
    top: 2px;
    left: 2px;
    height: 22px;
    width: 22px;
    transition: transform 0.3s linear;
}

.checkbox:checked +.toggle-label.ball {
    transform: translateX(24px);
}

/* Main Content Area */
main {
    flex-grow: 1;
    padding: 30px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.container {
    background-color: var(--container-bg);
    border-radius: 10px;
    box-shadow: 0 4px 15px var(--container-shadow);
    padding: 30px;
    width: 400px;
    max-width: 90%;
    text-align: center;
    margin-bottom: 40px;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

h1 {
    color: var(--header-text);
    margin-top: 0;
    margin-bottom: 25px;
    font-size: 2em;
}

h2 {
    color: var(--header-text);
    margin-bottom: 20px;
    font-size: 1.6em;
}

.result-container {
    background-color: var(--result-bg);
    border: 1px solid var(--result-border);
    border-radius: 5px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 15px;
    margin-bottom: 25px;
    min-height: 50px;
    overflow: hidden;
    word-break: break-all;
    position: relative;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

#result {
    font-size: 1.2em;
    font-weight: bold;
    color: var(--result-text);
    flex-grow: 1;
    text-align: left;
    margin-right: 10px;
    overflow-x: auto;
    white-space: nowrap;
    cursor: text;
    padding-right: 10px; /* Space for scroll if it appears */
}
#result::-webkit-scrollbar {
    display: none;
}
#result:focus {
    outline: none; /* Custom visual focus on result container */
    box-shadow: 0 0 0 2px var(--focus-ring-color);
}

.btn {
    background-color: var(--button-bg);
    color: white;
    border: none;
    border-radius: 5px;
    padding: 10px 15px;
    cursor: pointer;
    font-size: 1em;
    transition: background-color 0.2s ease, transform 0.1s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
}
.btn:disabled {
    background-color: var(--result-border);
    cursor: not-allowed;
    transform: none;
}

.btn i {
    margin-right: 5px;
}
.btn#clipboard i {
    margin-right: 0;
    margin-left: 5px;
}

/* Tooltip for Copy Button */
.btn#clipboard.tooltip {
    visibility: hidden;
    background-color: var(--button-hover-bg);
    color: #fff;
    text-align: center;
    border-radius: 4px;
    padding: 5px 8px;
    position: absolute;
    z-index: 1;
    bottom: 120%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity 0.3s, bottom 0.3s;
    font-size: 0.8em;
    white-space: nowrap;
}

.btn#clipboard.tooltip::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: var(--button-hover-bg) transparent transparent transparent;
}

.btn#clipboard.tooltip.show {
    visibility: visible;
    opacity: 1;
    bottom: calc(100% + 5px);
}

.btn:hover:not(:disabled) {
    background-color: var(--button-hover-bg);
    transform: translateY(-2px);
}

.btn:active:not(:disabled) {
    transform: translateY(0);
}

.btn-large {
    width: 100%;
    padding: 15px 0;
    font-size: 1.1em;
    margin-top: 20px;
}

.btn-clear-storage {
    background-color: #e74c3c;
    margin-top: 15px;
    width: 100%;
}
.btn-clear-storage:hover:not(:disabled) {
    background-color: #c0392b;
}

.settings {
    text-align: left;
    margin-bottom: 20px;
}
.setting-group {
    border: none;
    padding: 0;
    margin: 0;
}

.setting {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    animation: fadeIn 0.5s ease-out;
}
.setting label {
    font-size: 1em;
    color: var(--setting-label-color);
    flex-grow: 1;
    cursor: pointer;
    transition: color 0.3s ease;
}

.setting input[type="checkbox"] {
    width: 20px;
    height: 20px;
    border: 2px solid var(--link-color);
    border-radius: 4px;
    margin-left: 10px;
    cursor: pointer;
    position: relative;
    transition: background-color 0.2s ease, border-color 0.2s ease;
    display: grid;
    place-content: center;
}
.setting input[type="checkbox"]::before {
    content: "";
    width: 12px;
    height: 12px;
    transform: scale(0);
    transition: transform 0.2s ease;
    box-shadow: inset 1em 1em var(--container-bg);
    clip-path: polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0%, 43% 62%);
}
.setting input[type="checkbox"]:checked {
    background-color: var(--link-color);
    border-color: var(--link-color);
}
.setting input[type="checkbox"]:checked::before {
    transform: scale(1);
    box-shadow: inset 1em 1em white;
}
.setting input[type="checkbox"]:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.setting input[type="number"],
.setting select {
    width: 80px;
    padding: 8px;
    border: 1px solid var(--result-border);
    border-radius: 4px;
    text-align: center;
    font-size: 1em;
    margin-left: 10px;
    background-color: var(--container-bg);
    color: var(--text-color);
    transition: border-color 0.2s ease, background-color 0.3s ease, color 0.3s ease;
    cursor: pointer;
}
.setting input[type="number"]:focus,
.setting select:focus {
    outline: none;
    border-color: var(--link-color);
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.3);
}

.error {
    color: var(--error-color);
    font-size: 0.9em;
    margin-top: -10px;
    margin-bottom: 15px;
    text-align: left;
    min-height: 1.2em;
    white-space: pre-wrap;
}

.password-strength {
    margin-top: 25px;
    text-align: left;
}

#password-strength-text {
    font-size: 1.1em;
    font-weight: bold;
    color: var(--setting-label-color);
    margin-bottom: 10px;
    display: block;
    transition: color 0.3s ease;
}

#password-strength-meter {
    width: 100%;
    height: 10px;
    background-color: var(--meter-none);
    border-radius: 5px;
    transition: background-color 0.5s ease;
}

/* Strength indicators */
#password-strength-meter.none {
    background-color: var(--meter-none);
}
#password-strength-meter.weak {
    background-color: var(--meter-weak);
}
#password-strength-meter.medium {
    background-color: var(--meter-medium);
}
#password-strength-meter.strong {
    background-color: var(--meter-strong);
}

.password-storage {
    margin-top: 30px;
    text-align: left;
    width: 100%;
}

.password-storage h3 {
    color: var(--header-text);
    margin-bottom: 15px;
    font-size: 1.3em;
    text-align: center;
}

.storage-disclaimer {
    font-size: 0.85em;
    color: var(--setting-label-color);
    text-align: center;
    margin-bottom: 15px;
}

#stored-passwords {
    list-style: none;
    padding: 0;
    margin: 0;
    background-color: var(--result-bg);
    border: 1px solid var(--result-border);
    border-radius: 5px;
    max-height: 200px;
    overflow-y: auto;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

#stored-passwords li {
    padding: 10px 15px;
    border-bottom: 1px solid var(--result-border);
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9em;
    color: var(--result-text);
    word-break: break-all;
}
#stored-passwords li:first-child {
    border-top-left-radius: 5px;
    border-top-right-radius: 5px;
}

#stored-passwords li:last-child {
    border-bottom: none;
    border-bottom-left-radius: 5px;
    border-bottom-right-radius: 5px;
}

.no-hashes-message {
    text-align: center;
    font-style: italic;
    color: var(--setting-label-color);
}

/* Info Sections */
.info-section {
    background-color: var(--info-section-bg);
    border-radius: 10px;
    box-shadow: 0 4px 15px var(--info-section-shadow);
    padding: 30px;
    width: 700px;
    max-width: 90%;
    margin-bottom: 40px;
    text-align: left;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.info-section h2 {
    text-align: center;
    margin-bottom: 25px;
    color: var(--header-text);
}

.info-section ul {
    list-style-type: disc;
    margin-left: 20px;
    padding: 0;
    color: var(--text-color);
}

.info-section ul li {
    margin-bottom: 10px;
}

.info-section ul li strong {
    color: var(--header-text);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 20px;
}

.social-links a {
    font-size: 1.8em;
    color: var(--setting-label-color);
    transition: color 0.2s ease, transform 0.2s ease;
}

.social-links a:hover {
    color: var(--link-color);
    transform: translateY(-3px);
}

/* Footer Styles */
footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    padding: 20px;
    text-align: center;
    font-size: 0.9em;
    box-shadow: 0 -2px 5px rgba(0, 0, 0, 0.05);
    transition: background-color 0.3s ease, color 0.3s ease;
    margin-top: auto;
}

/* Animations & Feedback */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.btn#clipboard.no-password-feedback {
    animation: shake 0.3s;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-5px); }
  40%, 80% { transform: translateX(5px); }
}

/* Screen Reader Only (sr-only) class for hidden text that is read by screen readers */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Media Queries for Responsiveness */
@media (max-width: 768px) {
    header {
        flex-direction: row; /* Keep logo and menu on one line */
        align-items: center;
        padding: 15px 20px;
    }
    header.logo {
        flex-grow: 1; /* Push others to side */
    }

    header nav.menu-toggle {
        display: block; /* Show menu toggle on mobile */
    }

    header nav.nav-links {
        display: none; /* Hide nav links by default on mobile */
        flex-direction: column;
        position: absolute;
        top: 60px; /* Below header */
        left: 0;
        width: 100%;
        background-color: var(--header-bg);
        box-shadow: 0 5px 10px rgba(0,0,0,0.1);
        z-index: 999;
        padding: 10px 0;
    }
    header nav.nav-links.active {
        display: flex; /* Show when active */
    }

    header nav ul li {
        margin: 10px 0;
        text-align: center;
    }

  .theme-switch {
        margin-top: 0;
        margin-left: 15px; /* Adjust spacing */
        align-self: center;
    }

  .container,.info-section {
        width: 100%;
        max-width: 95%;
        padding: 20px;
    }

    h1 {
        font-size: 1.8em;
    }

    h2 {
        font-size: 1.4em;
    }

  .result-container {
        padding: 8px 10px;
    }

    #result {
        font-size: 1em;
    }

  .btn {
        padding: 8px 12px;
        font-size: 0.9em;
    }

  .btn-large {
        padding: 12px 0;
        font-size: 1em;
    }

  .setting label {
        font-size: 0.9em;
    }
}

@media (max-width: 480px) {
    header nav ul li {
        margin-left: 0;
    }

    header.logo a {
        font-size: 1.3em;
    }

    .setting input[type="number"],
    .setting select {
        width: 60px;
    }
}