: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;
    --danger-color: #dc2626;
    --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;
}

* {
    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;
}

.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;
}

.container {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    padding: 24px 20px 40px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.info-section,
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.info-header {
    width: 100%;
    padding: 15px 24px;
    background-color: #f8fafb;
    border: none;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    text-align: left;
}

.info-header h2,
.card h2 {
    font-size: 1.1rem;
    color: var(--brand-green);
    display: flex;
    align-items: center;
    gap: 10px;
}

.info-content {
    padding: 24px;
}

.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;
}

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

.usage-step {
    flex: 1;
    min-width: 220px;
    background-color: #f8fafb;
    padding: 15px 15px 15px 45px;
    border-radius: 8px;
    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;
}

.info-note {
    margin-top: 16px;
    color: var(--text-sub);
    font-size: 0.92rem;
}

.card {
    padding: 24px;
}

.card-heading {
    margin-bottom: 18px;
}

.card-heading p {
    margin-top: 10px;
    color: var(--text-sub);
}

.password-grid,
.tool-card,
.status-card {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.password-row,
.action-row {
    display: flex;
    gap: 10px;
}

.field-label {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-main);
}

.field-hint {
    color: var(--text-sub);
    font-size: 0.9rem;
}

.text-input,
.text-area {
    width: 100%;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 14px 16px;
    font-size: 1rem;
    color: var(--text-main);
    background-color: #ffffff;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.text-input:focus,
.text-area:focus {
    outline: none;
    border-color: var(--brand-green);
    box-shadow: 0 0 0 3px rgba(1, 137, 77, 0.12);
}

.text-area {
    min-height: 220px;
    resize: vertical;
    font-family: 'Courier New', Courier, monospace;
}

.output-area {
    background-color: #f8fafb;
}

.tab-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin-bottom: 8px;
}

.tab-button {
    border: 1px solid var(--border-color);
    background-color: #f8fafb;
    color: var(--text-sub);
    border-radius: 12px;
    padding: 14px 18px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tab-button:hover {
    border-color: rgba(1, 137, 77, 0.4);
    color: var(--brand-green);
}

.tab-button.active {
    background: linear-gradient(135deg, #01894d 0%, #0b9b58 100%);
    color: #ffffff;
    border-color: var(--brand-green);
    box-shadow: 0 8px 18px rgba(1, 137, 77, 0.18);
}

.tab-panel {
    display: none;
    flex-direction: column;
    gap: 12px;
}

.tab-panel.active {
    display: flex;
}

.btn-primary,
.btn-secondary {
    border: none;
    border-radius: 10px;
    padding: 12px 18px;
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s, background-color 0.2s, border-color 0.2s;
}

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

.btn-primary:hover {
    background-color: #016f3e;
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: #ffffff;
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: #f3f4f6;
}

.status-message {
    font-size: 0.98rem;
    color: var(--text-sub);
    background-color: #f8fafb;
    border-radius: 10px;
    padding: 14px 16px;
    border: 1px solid var(--border-color);
}

.status-message.success {
    color: var(--brand-green);
    border-color: rgba(1, 137, 77, 0.24);
    background-color: #f0fdf4;
}

.status-message.error {
    color: var(--danger-color);
    border-color: rgba(220, 38, 38, 0.2);
    background-color: #fef2f2;
}

.toast {
    position: fixed;
    right: 20px;
    bottom: 20px;
    background-color: var(--brand-green);
    color: #fff;
    padding: 12px 18px;
    border-radius: 999px;
    box-shadow: var(--shadow);
    font-weight: 700;
    z-index: 1100;
}

.toast.hidden {
    display: none;
}

@media (max-width: 900px) {
    .tab-list {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .main-header-inner,
    .password-row,
    .action-row {
        flex-direction: column;
        align-items: stretch;
    }

    .logo-area {
        gap: 10px;
    }

    .brand-logo {
        font-size: 1.1rem;
    }

    .container {
        padding: 20px 16px 32px;
    }

    .card,
    .info-content {
        padding: 18px;
    }

    .info-header {
        padding: 15px 18px;
    }

    .text-area {
        min-height: 180px;
    }
}