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

html, body {
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #1e1e1e;
    color: #f0f0f0;
}

.container {
    min-height: 100vh;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.pane {
    width: min(760px, 100%);
    border: 1px solid #333;
    border-radius: 12px;
    background-color: #2d2d2d;
    padding: 20px;
}

.pane-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    min-height: 40px;
    gap: 12px;
}

.label {
    font-weight: 600;
    color: #66afe9;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.action-btn {
    padding: 8px 16px;
    background-color: #2d2d2d;
    color: #66afe9;
    border: 1px solid #66afe9;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}

.action-btn:hover {
    background-color: #66afe9;
    color: #1e1e1e;
}

.action-btn:active {
    transform: translateY(1px);
}

.password-panel {
    border: 1px solid #333;
    border-radius: 8px;
    background-color: #232323;
    padding: 14px;
    margin-bottom: 16px;
}

.password-row {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 10px;
}

#password {
    width: 100%;
    border: 1px solid #333;
    border-radius: 6px;
    padding: 12px;
    background-color: #1b1b1b;
    color: #f0f0f0;
    font-size: 1.1rem;
    font-family: "Consolas", "Monaco", monospace;
    letter-spacing: 0.5px;
}

#password:focus {
    outline: none;
    border-color: #66afe9;
}

.status-row {
    margin-top: 12px;
    display: flex;
    justify-content: space-between;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
}

.strength {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: #d5d5d5;
}

.strength-label {
    color: #9aa8b7;
}

.strength-meter {
    width: 120px;
    height: 8px;
    border-radius: 999px;
    overflow: hidden;
    background-color: #1a1a1a;
    border: 1px solid #3a3a3a;
}

#strength-fill {
    height: 100%;
    width: 0;
    background-color: #da3633;
    transition: width 0.2s ease, background-color 0.2s ease;
}

#copy-notification {
    color: #2ea043;
    opacity: 0;
    transition: opacity 0.2s ease;
    font-size: 0.9rem;
}

#copy-notification.show {
    opacity: 1;
}

.controls-panel {
    border: 1px solid #333;
    border-radius: 8px;
    padding: 14px;
    background-color: #232323;
}

.control-row {
    margin-bottom: 12px;
}

.length-row {
    display: grid;
    grid-template-columns: auto 72px 1fr;
    align-items: center;
    gap: 10px;
}

.length-row label {
    color: #9aa8b7;
}

#length-input {
    width: 100%;
    border: 1px solid #333;
    border-radius: 6px;
    padding: 8px;
    background-color: #1b1b1b;
    color: #f0f0f0;
    text-align: center;
    font-size: 0.95rem;
}

#length-slider {
    width: 100%;
    accent-color: #66afe9;
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.option-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    border: 1px solid #3a3a3a;
    border-radius: 8px;
    padding: 10px 12px;
    color: #d5d5d5;
    background-color: #1f1f1f;
    cursor: pointer;
    user-select: none;
}

.option-card:hover {
    border-color: #66afe9;
}

.option-card input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: #66afe9;
    cursor: pointer;
}

.strength-weak #strength-fill {
    background-color: #da3633;
}

.strength-fair #strength-fill {
    background-color: #f0883e;
}

.strength-good #strength-fill {
    background-color: #d4a72c;
}

.strength-strong #strength-fill {
    background-color: #2ea043;
}

@media (max-width: 640px) {
    .pane {
        padding: 14px;
    }

    .password-row {
        grid-template-columns: 1fr;
    }

    .length-row {
        grid-template-columns: 1fr;
    }

    .options-grid {
        grid-template-columns: 1fr;
    }
}