:root {
    --bg: #d1d5db;
    --bg-card: #e3e5ea;
    --shadow-light: #f5f6fa;
    --shadow-dark: #b0b3b8;
    --text-main: #36394a;
    --text-secondary: #6c6f7d;
    --accent: #9a8cfc;
    --input-bg: #e3e5ea;
    --input-shadow-inset-light: #f5f6fa;
    --input-shadow-inset-dark: #b0b3b8;
}
body {
    background: var(--bg);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Segoe UI', Arial, sans-serif;
    transition: background 0.3s;
}

.container, .container.wider {
    background: var(--bg-card);
    border-radius: 20px;
    box-shadow: 12px 12px 32px var(--shadow-dark), -12px -12px 32px var(--shadow-light), 0 1.5px 8px #0001;
    padding: 24px 24px;
    width: 100%;
    max-width: 420px;
    min-width: 320px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    transition: background 0.3s;
    position: relative;
    border: none;
}

.container.wider {
    max-width: 640px;
}

h1 {
    color: var(--text-main);
    margin-bottom: 18px;
    font-weight: 700;
    letter-spacing: 1px;
    font-size: 1.5rem;
}

.password-group {
    margin-bottom: 18px;
}

.password-field {
    flex: 1;
    border: none;
    outline: none;
    background: var(--input-bg);
    color: var(--text-main);
    font-size: 1.1rem;
    padding: 8px 12px;
    border-radius: 7px;
    box-shadow: inset 2px 2px 8px var(--shadow-dark), inset -2px -2px 8px var(--shadow-light);
    margin-right: 12px;
    transition: box-shadow 0.2s;
}

.password-field:focus {
    box-shadow: 0 0 0 2px var(--accent), inset 2px 2px 8px var(--shadow-dark), inset -2px -2px 8px var(--shadow-light);
}

.btn {
    border: none;
    outline: none;
    background: var(--bg-card);
    color: var(--text-main);
    font-size: 1.2rem;
    margin-left: 8px;
    border-radius: 7px;
    box-shadow: 2px 2px 6px var(--shadow-dark), -2px -2px 6px var(--shadow-light);
    padding: 8px 16px;
    cursor: pointer;
    transition: box-shadow 0.2s, background 0.2s;
    position: relative;
}

.btn:active {
    box-shadow: inset 2px 2px 6px var(--shadow-dark), inset -2px -2px 6px var(--shadow-light);
    background: #c7cad1;
}

.btn:focus {
    outline: 2px solid var(--accent);
}

.btn .tooltip {
    position: absolute;
    left: 50%;
    bottom: 110%;
    transform: translateX(-50%);
    background: var(--bg-card);
    color: var(--text-main);
    padding: 6px 14px;
    border-radius: 8px;
    box-shadow: 2px 2px 8px var(--shadow-dark), -2px -2px 8px var(--shadow-light);
    font-size: 0.98rem;
    font-weight: 500;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.18s;
    z-index: 100;
    display: block;
}

.btn:hover .tooltip,
.btn:focus .tooltip {
    opacity: 1;
    pointer-events: auto;
}

body.dark .btn .tooltip {
    background: rgba(35,36,58,0.92);
    color: #f3f3fa;
    box-shadow: 2px 2px 8px #181828, -2px -2px 8px #2e2f4a;
    border: 1px solid rgba(255,255,255,0.05);
}

@media (max-width: 700px) {
    .container, .container.wider {
        padding: 18px 2vw;
        max-width: 98vw;
    }
    .theme-toggle-btn {
        top: 12px;
        right: 12px;
        padding: 8px 10px;
        font-size: 1.1rem;
    }
    h1 {
        font-size: 1.3rem;
        margin-bottom: 18px;
    }
    .password-group {
        flex-direction: column;
        padding: 8px 4px;
        gap: 8px;
    }
    .password-field {
        margin-right: 0;
        margin-bottom: 8px;
        width: 100%;
        font-size: 1rem;
        padding: 10px 10px;
    }
    .btn, .toggle-visibility-btn {
        margin-left: 0;
        width: 100%;
        margin-bottom: 4px;
        font-size: 1rem;
        padding: 12px 0;
    }
    .dropdown-toggle {
        font-size: 1rem;
        padding: 12px 0;
    }
    .dropdown-menu {
        position: static;
        width: 100%;
        margin-top: 6px;
        padding: 18px 8px 12px 8px;
        font-size: 0.98rem;
        box-shadow: 0 4px 16px 0 rgba(60,60,90,0.13), 1px 1px 4px var(--shadow-dark), -1px -1px 4px var(--shadow-light);
    }
    .checkbox-group label {
        font-size: 0.97rem;
    }
    .strength-section, .history-section {
        font-size: 0.98rem;
    }
    .password-history {
        flex-direction: column;
        gap: 4px;
    }
    .password-history li {
        width: 100%;
        font-size: 0.98rem;
        padding: 10px 8px;
    }
}

.dropdown-group {
    margin-top: 10px;
}

.dropdown-toggle {
    width: 100%;
    background: var(--bg-card);
    color: var(--text-main);
    border-radius: 10px;
    box-shadow: 2px 2px 6px var(--shadow-dark), -2px -2px 6px var(--shadow-light);
    padding: 10px 18px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    outline: none;
    transition: box-shadow 0.2s, background 0.2s;
}

.dropdown-toggle:active, .dropdown-toggle:focus {
    box-shadow: inset 2px 2px 6px var(--shadow-dark), inset -2px -2px 6px var(--shadow-light);
    background: #c7cad1;
}

.dropdown-menu {
    background: var(--bg-card);
    border-radius: 12px;
    box-shadow: 8px 8px 24px var(--shadow-dark), -8px -8px 24px var(--shadow-light), 0 1.5px 8px #0001;
    border: none;
    padding: 22px 24px 16px 24px;
    margin-top: 8px;
    z-index: 10;
    opacity: 0;
    transform: translateY(-12px) scale(0.98);
    pointer-events: none;
    transition: opacity 0.22s cubic-bezier(.4,2,.6,1), transform 0.22s cubic-bezier(.4,2,.6,1);
}

.dropdown-group.open .dropdown-menu {
    display: block;
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

.dropdown-menu label,
.dropdown-menu .checkbox-group label {
    color: var(--text-main);
    font-weight: 500;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    padding: 6px 0;
    border-radius: 6px;
    transition: background 0.18s;
}

.dropdown-menu .checkbox-group label:hover,
.dropdown-menu .checkbox-group label:focus-within {
    background: #f3f0ff;
}

.dropdown-menu input[type="number"] {
    width: 60px;
    padding: 6px 8px;
    border-radius: 7px;
    border: 1.5px solid #d1b3ff;
    background: var(--bg-card);
    box-shadow: inset 2px 2px 6px var(--shadow-dark), inset -2px -2px 6px var(--shadow-light);
    color: var(--text-main);
    margin-bottom: 12px;
    margin-left: 8px;
    font-size: 1rem;
    transition: border 0.18s;
}

.dropdown-menu input[type="number"]:focus {
    border: 1.5px solid var(--accent);
    outline: none;
}

.dropdown-heading {
    font-size: 1.08em;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 8px;
    letter-spacing: 0.5px;
    text-align: left;
}

.dropdown-divider {
    border: none;
    border-top: 1.5px solid #e3e3f7;
    margin: 14px 0 16px 0;
}

body.dark .dropdown-divider {
    border-top: 1.5px solid #23243a;
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 4px;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.01em;
    padding: 7px 8px;
    border-radius: 7px;
    cursor: pointer;
    transition: background 0.18s, box-shadow 0.18s;
    position: relative;
}

.checkbox-group label:hover,
.checkbox-group label:focus-within {
    background: #f3f0ff;
    box-shadow: 0 2px 8px #bfaaff22;
}

.checkbox-group input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--accent);
    border-radius: 5px;
    margin-right: 6px;
    border: 1.5px solid #bfaaff;
    transition: box-shadow 0.18s, border 0.18s;
}

.checkbox-group input[type="checkbox"]:focus {
    outline: 2px solid var(--accent);
    box-shadow: 0 0 0 2px #bfaaff55;
}

.checkbox-group input[type="checkbox"]:checked + span {
    color: var(--accent);
    font-weight: 600;
}

body.dark .checkbox-group label:hover,
body.dark .checkbox-group label:focus-within {
    background: #23234a;
    box-shadow: 0 2px 8px #23234a44;
}

body.dark .dropdown-heading {
    color: #d1b3ff;
}

body.dark .checkbox-group input[type="checkbox"] {
    border: 1.5px solid #d1b3ff;
}

.strength-section {
    margin: 28px 0 18px 0;
    text-align: left;
}

.strength-bar-container {
    width: 100%;
    height: 16px;
    background: var(--bg-card);
    border-radius: 8px;
    box-shadow: 2px 2px 6px var(--shadow-dark), -2px -2px 6px var(--shadow-light);
    margin: 8px 0 6px 0;
    overflow: hidden;
}

.strength-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #ff6b6b, #f7b731, #6bcf6b, #4a69bd);
    border-radius: 8px;
    transition: width 0.4s cubic-bezier(.4,2,.6,1), background 0.4s;
}

.strength-label {
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 2px;
    margin-top: 2px;
}

.strength-details {
    font-size: 0.98rem;
    color: var(--text-secondary);
    margin-top: 2px;
}

.toggle-visibility-btn {
    margin-left: 8px;
    font-size: 1.2rem;
    background: var(--bg-card);
    color: var(--text-main);
    border-radius: 7px;
    box-shadow: 2px 2px 6px var(--shadow-dark), -2px -2px 6px var(--shadow-light);
    padding: 8px 16px;
    cursor: pointer;
    border: none;
    outline: none;
    transition: box-shadow 0.2s, background 0.2s;
}
.toggle-visibility-btn:active {
    box-shadow: inset 2px 2px 6px var(--shadow-dark), inset -2px -2px 6px var(--shadow-light);
    background: #c7cad1;
}
.toggle-visibility-btn:focus {
    outline: 2px solid var(--accent);
}

.history-section {
    margin: 18px 0 10px 0;
    text-align: left;
}
.password-history {
    list-style: none;
    padding: 0;
    margin: 8px 0 0 0;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.password-history li {
    background: var(--bg-card);
    border-radius: 8px;
    box-shadow: 4px 4px 12px var(--shadow-dark), -4px -4px 12px var(--shadow-light), 0 1.5px 8px #0001;
    padding: 6px 14px;
    font-size: 1rem;
    color: var(--text-main);
    cursor: pointer;
    transition: box-shadow 0.2s, background 0.2s;
    user-select: all;
}
.password-history li:active, .password-history li:focus {
    background: #c7cad1;
    box-shadow: 0 0 0 2px var(--accent);
    outline: none;
}

.theme-toggle-btn {
    position: absolute;
    top: 24px;
    right: 32px;
    width: 54px;
    height: 28px;
    background: var(--bg-card);
    color: var(--accent);
    border-radius: 16px;
    box-shadow: 2px 2px 8px var(--shadow-dark), -2px -2px 8px var(--shadow-light);
    padding: 0;
    cursor: pointer;
    border: none;
    outline: none;
    transition: box-shadow 0.2s, background 0.2s;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    overflow: visible;
}
.theme-toggle-btn:hover, .theme-toggle-btn:focus {
    box-shadow: 0 0 0 4px var(--accent), 2px 2px 8px var(--shadow-dark), -2px -2px 8px var(--shadow-light);
    outline: none;
}
.theme-toggle-btn .toggle-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: linear-gradient(135deg, #fff 60%, var(--accent) 100%);
    box-shadow: 1px 1px 4px var(--shadow-dark), -1px -1px 4px var(--shadow-light);
    margin: 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: transform 0.35s cubic-bezier(.4,2,.6,1), background 0.3s, color 0.3s;
    will-change: transform;
}
.theme-toggle-btn .toggle-thumb.sun {
    transform: translateX(26px);
}
.theme-toggle-btn .toggle-thumb.moon {
    transform: translateX(0);
}
.theme-toggle-btn .toggle-thumb svg {
    opacity: 1;
    transition: opacity 0.25s;
}
.theme-toggle-btn .toggle-thumb .hidden {
    opacity: 0;
    transition: opacity 0.25s;
}
.theme-toggle-btn .tooltip {
    position: absolute;
    left: 50%;
    bottom: 110%;
    transform: translateX(-50%);
    background: var(--bg-card);
    color: var(--text-main);
    padding: 6px 14px;
    border-radius: 8px;
    box-shadow: 2px 2px 8px var(--shadow-dark), -2px -2px 8px var(--shadow-light);
    font-size: 0.98rem;
    font-weight: 500;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.18s;
    z-index: 100;
    display: block;
}
.theme-toggle-btn:hover .tooltip,
.theme-toggle-btn:focus .tooltip {
    opacity: 1;
    pointer-events: auto;
}
body.dark .theme-toggle-btn .tooltip {
    background: rgba(35,36,58,0.92);
    color: #f3f3fa;
    box-shadow: 2px 2px 8px #181828, -2px -2px 8px #2e2f4a;
    border: 1px solid rgba(255,255,255,0.05);
}
body.dark .theme-toggle-btn {
    background: var(--bg-card);
    box-shadow: 2px 2px 8px #181828, -2px -2px 8px #2e2f4a;
}
body.dark .theme-toggle-btn .toggle-thumb {
    background: linear-gradient(135deg, #23243a 60%, var(--accent) 100%);
    color: #fff;
}
.theme-toggle-btn .toggle-thumb.sun svg#sun-icon {
    color: #f7b731;
}
.theme-toggle-btn .toggle-thumb.moon svg#moon-icon {
    color: #bfaaff;
}
body.dark .theme-toggle-btn .toggle-thumb svg {
    color: #f7b731;
}
body.dark .theme-toggle-btn .toggle-thumb.sun svg#sun-icon {
    color: #f7b731;
}
.theme-toggle-btn .toggle-thumb.moon svg#moon-icon {
    color: #bfaaff;
}
body.dark {
    --bg: linear-gradient(135deg, #181828 0%, #23243a 100%);
    --bg-card: rgba(35,36,58,0.92);
    --shadow-light: #23243a;
    --shadow-dark: #10101a;
    --text-main: #f3f3fa;
    --text-secondary: #b8bac0;
    --accent: #d1b3ff;
    --input-bg: rgba(35,36,58,0.92);
    --input-shadow-inset-light: #23243a;
    --input-shadow-inset-dark: #10101a;
}
body.dark, body.dark .container, body.dark .container.wider {
    background: var(--bg);
    background-blend-mode: lighten;
}
body.dark .container, body.dark .container.wider {
    box-shadow: 8px 8px 24px #181828, -8px -8px 24px #2e2f4a, 0 1.5px 8px #00000033;
    border-radius: 24px;
    background: var(--bg-card);
    backdrop-filter: blur(12px) saturate(1.2);
    -webkit-backdrop-filter: blur(12px) saturate(1.2);
    border: 1.5px solid rgba(255,255,255,0.07);
}
body.dark .password-group, body.dark .dropdown-menu, body.dark .strength-bar-container, body.dark .password-history li, body.dark .tooltip {
    background: rgba(35,36,58,0.85);
    box-shadow: 4px 4px 12px #181828, -4px -4px 12px #2e2f4a, 0 1.5px 8px #00000033;
    border-radius: 16px;
    backdrop-filter: blur(8px) saturate(1.1);
    -webkit-backdrop-filter: blur(8px) saturate(1.1);
    border: 1px solid rgba(255,255,255,0.05);
}
body.dark .password-field, body.dark .dropdown-menu input[type="number"] {
    background: rgba(35,36,58,0.92);
    color: #f3f3fa;
    box-shadow: inset 2px 2px 6px #181828, inset -2px -2px 6px #2e2f4a;
    border-radius: 10px;
    border: 1px solid rgba(255,255,255,0.04);
}
body.dark .btn, body.dark .toggle-visibility-btn, body.dark .theme-toggle-btn {
    background: rgba(35,36,58,0.92);
    color: #d1b3ff;
    box-shadow: 2px 2px 6px #181828, -2px -2px 6px #2e2f4a;
    border-radius: 10px;
    border: 1px solid rgba(255,255,255,0.04);
}
body.dark .btn:active, body.dark .btn:focus, body.dark .toggle-visibility-btn:active, body.dark .toggle-visibility-btn:focus, body.dark .theme-toggle-btn:active, body.dark .theme-toggle-btn:focus {
    background: #23234a;
    color: #d1b3ff;
    box-shadow: inset 2px 2px 6px #181828, inset -2px -2px 6px #2e2f4a;
    outline: 2px solid #d1b3ff;
}
body.dark .strength-bar {
    background: linear-gradient(90deg, #ff6b6b, #f7b731, #6bcf6b, #d1b3ff);
    box-shadow: 0 1.5px 8px #00000033;
}
body.dark .help-icon {
    background: rgba(35,36,58,0.92);
    color: #d1b3ff;
    box-shadow: 1px 1px 3px #181828, -1px -1px 3px #2e2f4a;
    border: 1px solid rgba(255,255,255,0.04);
}
body.dark .help-icon:focus, body.dark .help-icon:hover {
    background: #23234a;
    color: #d1b3ff;
}
body.dark .tooltip {
    background: rgba(35,36,58,0.92);
    color: #f3f3fa;
    box-shadow: 2px 2px 8px #181828, -2px -2px 8px #2e2f4a;
    border: 1px solid rgba(255,255,255,0.05);
}
body.dark .password-history li {
    background: rgba(35,36,58,0.92);
    color: #f3f3fa;
    box-shadow: 2px 2px 6px #181828, -2px -2px 6px #2e2f4a;
    border-radius: 10px;
    border: 1px solid rgba(255,255,255,0.04);
}
body.dark .password-history li:active, body.dark .password-history li:focus {
    background: #23234a;
    color: #d1b3ff;
    box-shadow: 0 0 0 2px #d1b3ff;
}
.theme-toggle-btn .toggle-thumb svg {
    width: 22px;
    height: 22px;
    display: block;
    color: var(--accent);
    transition: color 0.3s;
}
body.dark .theme-toggle-btn .toggle-thumb svg {
    color: #f7b731;
}
.theme-toggle-btn .toggle-thumb.sun svg#sun-icon {
    color: #f7b731;
}
.theme-toggle-btn .toggle-thumb.moon svg#moon-icon {
    color: #bfaaff;
}
.hidden {
    display: none;
}
body.dark .dropdown-menu {
    background: rgba(35,36,58,0.97);
    box-shadow: 0 8px 32px 0 rgba(20,20,40,0.28), 4px 4px 12px #181828, -4px -4px 12px #2e2f4a;
    border: 1.5px solid #23243a;
}
body.dark .dropdown-menu .checkbox-group label:hover,
body.dark .dropdown-menu .checkbox-group label:focus-within {
    background: #23234a;
}
.slider-group {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 14px;
    background: var(--bg-card);
    border-radius: 10px;
    box-shadow: 4px 4px 12px var(--shadow-dark), -4px -4px 12px var(--shadow-light);
    padding: 10px 14px;
}
.slider-group input[type="range"] {
    width: 140px;
    accent-color: var(--accent);
    height: 3px;
    background: linear-gradient(90deg, #9a8cfc 0%, #bfaaff 100%);
    border-radius: 6px;
    outline: none;
    transition: background 0.2s;
}
.slider-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 2px 8px #bfaaff44;
    border: 2px solid #fff;
    cursor: pointer;
    transition: background 0.2s, box-shadow 0.2s;
}
.slider-group input[type="range"]:focus::-webkit-slider-thumb {
    box-shadow: 0 0 0 4px #d1b3ff55;
}
.slider-group input[type="range"]::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 2px 8px #bfaaff44;
    border: 2px solid #fff;
    cursor: pointer;
    transition: background 0.2s, box-shadow 0.2s;
}
.slider-group input[type="range"]:focus::-moz-range-thumb {
    box-shadow: 0 0 0 4px #d1b3ff55;
}
.slider-group input[type="range"]::-ms-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 2px 8px #bfaaff44;
    border: 2px solid #fff;
    cursor: pointer;
    transition: background 0.2s, box-shadow 0.2s;
}
.slider-group input[type="range"]:focus::-ms-thumb {
    box-shadow: 0 0 0 4px #d1b3ff55;
}
.slider-group #length-value {
    min-width: 2.5em;
    font-size: 1.1em;
    font-weight: 600;
    color: var(--accent);
    text-align: right;
    background: #f3f0ff;
    border-radius: 6px;
    padding: 2px 10px;
    margin-left: 2px;
}
body.dark .slider-group #length-value {
    background: #23234a;
    color: #d1b3ff;
}
fieldset {
    border: none;
}