/* Basic Reset & Body Styles */
:root {
    --bg-color-light: #f4f7f6;
    --text-color-light: #3c3a3a;
    --card-bg-light: #ffffff;
    --border-color-light: #e0e0e0;
    --button-bg-light: #4CAF50;
    --button-text-light: white;
    --input-bg-light: #f0f0f0;
    --input-border-light: #ccc;
    --slider-track-light: #ddd;
    --slider-thumb-light: #4CAF50;
    --checkbox-border-light: #bbb;
    --checkbox-checked-light: #4CAF50;

    --bg-color-dark: #282c34;
    --text-color-dark: #aac7fc;
    --card-bg-dark: #3a3f4a;
    --border-color-dark: #05ab9b;
    --button-bg-dark: #61afef;
    --button-text-dark: #000000;
    --input-bg-dark: #21252b;
    --input-border-dark: #444;
    --slider-track-dark: #555;
    --slider-thumb-dark: #61afef;
    --checkbox-border-dark: #777;
    --checkbox-checked-dark: #61afef;
}

body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--bg-color-light);
    color: var(--text-color-light);
    transition: background-color 0.3s ease, color 0.3s ease;
    padding: 20px;
    box-sizing: border-box;
}

body.dark-mode {
    background-color: var(--bg-color-dark);
    color: var(--text-color-dark);
}

/* Container */
.container {
    background-color: var(--card-bg-light);
    border-radius: 12px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    padding: 35px;
    width: 100%;
    max-width: 500px;
    text-align: center;
    border: 1px solid var(--border-color-light);
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

body.dark-mode .container {
    background-color: var(--card-bg-dark);
    border-color: var(--border-color-dark);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

h1 {
    color: var(--text-color-light);
    margin-bottom: 30px;
    font-size: 2.2em;
    font-weight: 700;
}

body.dark-mode h1 {
    color: var(--text-color-dark);
}

.theme-toggle-wrapper {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    margin-bottom: 25px;
    gap: 10px;
}

.theme-label {
    font-size: 0.9em;
    color: var(--text-color-light);
}

body.dark-mode .theme-label {
    color: var(--text-color-dark);
}

.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 28px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    -webkit-transition: .4s;
    transition: .4s;
    border-radius: 28px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    -webkit-transition: .4s;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--checkbox-checked-light);
}

body.dark-mode input:checked + .slider {
    background-color: var(--checkbox-checked-dark);
}

input:focus + .slider {
    box-shadow: 0 0 1px var(--checkbox-checked-light);
}

body.dark-mode input:focus + .slider {
    box-shadow: 0 0 1px var(--checkbox-checked-dark);
}

input:checked + .slider:before {
    -webkit-transform: translateX(22px);
    -ms-transform: translateX(22px);
    transform: translateX(22px);
}


.password-display-wrapper {
    position: relative;
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    border: 1px solid var(--border-color-light);
    border-radius: 8px;
    overflow: hidden;
    background-color: var(--input-bg-light);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

body.dark-mode .password-display-wrapper {
    background-color: var(--input-bg-dark);
    border-color: var(--input-border-dark);
}

#password-display {
    flex-grow: 1;
    padding: 15px 20px;
    font-size: 1.2em;
    border: none;
    outline: none;
    background-color: transparent;
    color: var(--text-color-light);
    font-family: 'Roboto Mono', monospace;
}

body.dark-mode #password-display {
    color: var(--text-color-dark);
}

#password-display::placeholder {
    color: #999;
}

body.dark-mode #password-display::placeholder {
    color: #777;
}

#copy-button {
    background-color: transparent;
    border: none;
    padding: 15px;
    cursor: pointer;
    font-size: 1.1em;
    color: var(--text-color-light);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s ease, background-color 0.2s ease;
}

body.dark-mode #copy-button {
    color: var(--text-color-dark);
}

#copy-button:hover {
    color: var(--button-bg-light);
}

body.dark-mode #copy-button:hover {
    color: var(--button-bg-dark);
}

#copy-button svg {
    width: 24px;
    height: 24px;
}

.copy-feedback {
    position: absolute;
    top: -30px;
    right: 10px;
    background-color: #5cb85c;
    color: white;
    padding: 5px 10px;
    border-radius: 5px;
    font-size: 0.8em;
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
    pointer-events: none; 
}

.copy-feedback.show {
    opacity: 1;
    top: -40px; 
}

.options-group {
    text-align: left;
    margin-bottom: 30px;
    padding: 0 10px;
}

.option-item {
    display: flex;
    align-items: center;
    margin-bottom: 18px;
    font-size: 1.1em;
}

.option-item label {
    flex-basis: 60%; 
    margin-right: 15px;
    color: var(--text-color-light);
}

body.dark-mode .option-item label {
    color: var(--text-color-dark);
}

#password-length {
    flex-grow: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 8px;
    background: var(--slider-track-light);
    outline: none;
    border-radius: 5px;
    cursor: pointer;
    margin-right: 10px;
    transition: background-color 0.3s ease;
}

body.dark-mode #password-length {
    background: var(--slider-track-dark);
}

#password-length::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--slider-thumb-light);
    cursor: grab;
    border: 3px solid white;
    box-shadow: 0 0 0 1px #ccc;
    transition: background-color 0.3s ease;
}

body.dark-mode #password-length::-webkit-slider-thumb {
    background: var(--slider-thumb-dark);
    border: 3px solid var(--card-bg-dark);
    box-shadow: 0 0 0 1px var(--border-color-dark);
}

#password-length::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--slider-thumb-light);
    cursor: grab;
    border: 3px solid white;
    box-shadow: 0 0 0 1px #ccc;
    transition: background-color 0.3s ease;
}

body.dark-mode #password-length::-moz-range-thumb {
    background: var(--slider-thumb-dark);
    border: 3px solid var(--card-bg-dark);
    box-shadow: 0 0 0 1px var(--border-color-dark);
}


#length-value {
    min-width: 25px;
    text-align: right;
    font-weight: bold;
    color: var(--text-color-light);
}

body.dark-mode #length-value {
    color: var(--text-color-dark);
}

.checkbox-item input[type="checkbox"] {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border: 2px solid var(--checkbox-border-light);
    border-radius: 6px;
    cursor: pointer;
    margin-right: 10px;
    position: relative;
    display: grid;
    place-content: center;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

body.dark-mode .checkbox-item input[type="checkbox"] {
    border-color: var(--checkbox-border-dark);
}

.checkbox-item input[type="checkbox"]::before {
    content: "";
    width: 14px;
    height: 14px;
    transform: scale(0);
    transition: transform 0.2s ease-in-out;
    box-shadow: inset 1em 1em var(--checkbox-checked-light);
    background-color: var(--checkbox-checked-light);
    clip-path: polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0%, 43% 62%);
    border-radius: 3px; 
}

body.dark-mode .checkbox-item input[type="checkbox"]::before {
    box-shadow: inset 1em 1em var(--checkbox-checked-dark);
    background-color: var(--checkbox-checked-dark);
}


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

body.dark-mode .checkbox-item input[type="checkbox"]:checked {
    background-color: var(--checkbox-checked-dark);
    border-color: var(--checkbox-checked-dark);
}

.checkbox-item input[type="checkbox"]:checked::before {
    transform: scale(1);
}

.checkbox-item label {
    cursor: pointer;
    user-select: none; 
}

#generate-button {
    background-color: var(--button-bg-light);
    color: var(--button-text-light);
    border: none;
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 1.3em;
    font-weight: 700;
    cursor: pointer;
    width: 100%;
    transition: background-color 0.3s ease, transform 0.1s ease;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

body.dark-mode #generate-button {
    background-color: var(--button-bg-dark);
    color: var(--button-text-dark);
}

#generate-button:hover {
    background-color: #45a049; 
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
}

body.dark-mode #generate-button:hover {
    background-color: #4fa1e2; 
}

#generate-button:active {
    transform: translateY(0);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

@media (max-width: 600px) {
    .container {
        padding: 25px;
    }

    h1 {
        font-size: 1.8em;
    }

    #password-display {
        font-size: 1em;
        padding: 12px 15px;
    }

    #copy-button {
        padding: 12px;
    }

    .option-item {
        flex-direction: column;
        align-items: flex-start;
        margin-bottom: 15px;
    }

    .option-item label {
        margin-bottom: 8px;
        font-size: 1em;
    }

    #password-length {
        width: 100%;
        margin-right: 0;
    }

    .checkbox-item {
        flex-direction: row; 
    }

    #generate-button {
        font-size: 1.1em;
        padding: 12px 20px;
    }
}