:root {
    --brand-green: #01894d;
    --brand-orange: #f39800;
    --bg-color: #f8fafb;
    --card-bg: #ffffff;
    --text-main: #333333;
    --text-sub: #666666;
    --border-color: #e5e7eb;
    --accent-color: #f0fdf4;
    --radius: 12px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --font-family: 'Inter', 'Noto Sans JP', sans-serif;

    --strength-weak: #ef4444;
    --strength-medium: #f59e0b;
    --strength-strong: #10b981;
    --strength-very-strong: #3b82f6;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    padding: 24px 20px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Header (Shared) */
.main-header {
    background-color: var(--brand-green);
    border-bottom: 2px solid var(--brand-orange);
    padding: 15px 0;
    color: #ffffff;
    width: 100%;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.main-header-inner {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 15px;
}

.brand-logo {
    font-weight: 800;
    font-size: 1.3rem;
    color: #ffffff;
}

.title-icon {
    width: 24px;
    height: 24px;
}

nav {
    display: flex;
    gap: 10px;
}

.btn-home {
    background-color: rgba(255, 255, 255, 0.15);
    color: #fff;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    border: 1px solid rgba(255, 255, 255, 0.4);
    transition: all 0.2s;
}

.btn-home:hover {
    background-color: rgba(255, 255, 255, 0.3);
    border-color: #fff;
}

/* Info Section (Shared) */
.info-section {
    background-color: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.info-header {
    padding: 15px 24px;
    background-color: #f8fafb;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.info-header h2 {
    font-size: 1.1rem;
    color: var(--brand-green);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.toggle-icon {
    width: 24px;
    height: 24px;
    fill: var(--text-sub);
    transition: transform 0.3s ease;
}

.info-section.collapsed .info-content {
    display: none;
}

.info-section.collapsed .toggle-icon {
    transform: rotate(-180deg);
}

.info-section.collapsed .info-header {
    border-bottom: none;
}

.info-content {
    padding: 24px;
}

.usage-steps {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.usage-step {
    flex: 1;
    min-width: 200px;
    background-color: #f8fafb;
    padding: 15px 15px 15px 45px;
    border-radius: 6px;
    position: relative;
    font-size: 0.95rem;
}

.usage-step::before {
    content: attr(data-step);
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 24px;
    height: 24px;
    background-color: var(--brand-green);
    color: #fff;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 0.8rem;
    font-weight: 700;
}

/* Card */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
    border: 1px solid var(--border-color);
}

.card h2 {
    font-size: 1.25rem;
    color: var(--text-main);
    padding-bottom: 12px;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 2px solid var(--border-color);
}

/* Generator Card Specifics */
.generator-card {
    background: linear-gradient(135deg, #ffffff 0%, #f0fdf4 100%);
    border: 2px solid var(--brand-green);
}

.password-display-area {
    background-color: #fff;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: center;
    position: relative;
}

.password-output {
    font-family: 'Courier New', Courier, monospace;
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-main);
    word-break: break-all;
    text-align: center;
    letter-spacing: 1px;
    min-height: 3rem;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.action-buttons {
    display: flex;
    gap: 10px;
    width: 100%;
}

.btn-action {
    border: none;
    border-radius: 8px;
    padding: 12px 20px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s;
}

.btn-action svg {
    width: 20px;
    height: 20px;
}

.btn-copy {
    background-color: var(--brand-green);
    color: white;
    flex-grow: 1;
    box-shadow: 0 4px 6px rgba(1, 137, 77, 0.2);
}

.btn-copy:hover {
    background-color: #016f3e;
    transform: translateY(-2px);
}

.btn-copy:active {
    transform: translateY(0);
}

.btn-refresh {
    background-color: #f3f4f6;
    color: var(--text-main);
    border: 1px solid var(--border-color);
    width: 60px;
    flex-shrink: 0;
}

.btn-refresh:hover {
    background-color: #e5e7eb;
}

.strength-meter {
    margin-top: 10px;
}

.strength-bar-container {
    height: 6px;
    background-color: #e5e7eb;
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 8px;
}

.strength-bar {
    height: 100%;
    width: 0%;
    transition: width 0.3s ease, background-color 0.3s ease;
}

.strength-text {
    font-size: 0.85rem;
    color: var(--text-sub);
    font-weight: 600;
    display: block;
    text-align: right;
}

/* Settings Card */
.settings-row {
    margin-bottom: 24px;
}

.setting-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    font-weight: 700;
    color: var(--text-main);
}

.highlight-value {
    color: var(--brand-green);
    font-size: 1.2rem;
}

.slider-container {
    padding: 10px 0;
}

input[type="range"] {
    width: 100%;
    height: 8px;
    background: #e5e7eb;
    border-radius: 4px;
    outline: none;
    -webkit-appearance: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 24px;
    height: 24px;
    background: var(--brand-green);
    border-radius: 50%;
    border: 2px solid #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    cursor: pointer;
    transition: transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.preset-buttons {
    display: flex;
    gap: 8px;
    margin-top: 12px;
    flex-wrap: wrap;
}

.btn-preset {
    background: #fff;
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    border-radius: 16px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-preset.active {
    background-color: var(--brand-green);
    color: white;
    border-color: var(--brand-green);
}

.btn-preset:hover:not(.active) {
    background-color: #f3f4f6;
}

.settings-grid {
    display: flex;
    gap: 32px;
}

.settings-column {
    flex: 1;
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.checkbox-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    cursor: pointer;
    user-select: none;
    font-size: 0.95rem;
    position: relative;
    padding-left: 30px;
}

.checkbox-item input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    position: absolute;
    top: 2px;
    left: 0;
    height: 20px;
    width: 20px;
    background-color: #fff;
    border: 2px solid #cbd5e1;
    border-radius: 4px;
    transition: all 0.2s;
}

.checkbox-item:hover input~.checkmark {
    border-color: var(--brand-green);
}

.checkbox-item input:checked~.checkmark {
    background-color: var(--brand-green);
    border-color: var(--brand-green);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.checkbox-item input:checked~.checkmark:after {
    display: block;
}

.checkbox-item .checkmark:after {
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.note {
    display: block;
    font-size: 0.8rem;
    color: var(--text-sub);
    margin-top: 4px;
    margin-left: 0;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background-color: var(--brand-green);
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    z-index: 2000;
    font-weight: 600;
    animation: slideIn 0.3s ease-out;
}

.hidden {
    display: none !important;
}

@keyframes slideIn {
    from {
        transform: translateY(100%);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Responsive */
@media (max-width: 600px) {
    .settings-grid {
        flex-direction: column;
        gap: 24px;
    }

    .password-output {
        font-size: 1.5rem;
    }
}