/* ==========================================================================
   Minna no Ginko Inspired Minimal Monotone Design System
   Colors: Pure White (#FFFFFF), Jet Black (#000000), Soft Gray (#F5F5F5 / #737373)
   ========================================================================== */
:root {
    --bg-white: #ffffff;
    --bg-subtle: #f7f7f7;
    --text-black: #000000;
    --text-muted: #666666;
    --border-black: #000000;
    --border-light: #e0e0e0;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-white);
    color: var(--text-black);
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP", Meiryo, sans-serif;
    line-height: 1.75;
    letter-spacing: 0.03em;
    -webkit-font-smoothing: antialiased;
}

/* Header */
.site-header {
    border-bottom: 1px solid var(--border-black);
    background: var(--bg-white);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    max-width: 1040px;
    margin: 0 auto;
    padding: 20px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.brand-logo {
    font-size: 1rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    color: var(--text-black);
    text-decoration: none;
}

.header-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    font-size: 0.8rem;
    font-weight: 700;
}

.header-nav a {
    color: var(--text-black);
    text-decoration: none;
    transition: opacity 0.2s;
}

.header-nav a:hover {
    opacity: 0.6;
}

/* Layout Container */
.container {
    max-width: 1040px;
    margin: 0 auto;
    padding: 64px 24px 96px;
}

.container.narrow {
    max-width: 680px;
}

/* Hero Typography */
.hero {
    margin-bottom: 64px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--border-black);
}

.hero-eyebrow {
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    margin: 0 0 12px;
}

.hero-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: 0.02em;
    margin: 0 0 20px;
}

.hero-lead {
    font-size: 0.95rem;
    color: var(--text-muted);
    max-width: 640px;
    margin: 0;
}

/* Cards & Grid */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
    gap: 24px;
}

.mono-card {
    border: 1px solid var(--border-black);
    padding: 32px 28px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background: var(--bg-white);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.mono-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.08);
}

.mono-box {
    border: 1px solid var(--border-black);
    padding: 40px 36px;
    background: var(--bg-white);
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.card-number {
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 0.1em;
}

.tag {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    padding: 3px 10px;
    border: 1px solid var(--border-black);
    border-radius: 9999px;
}

.tag-solid {
    background: var(--text-black);
    color: var(--bg-white);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 800;
    margin: 0 0 12px;
}

.card-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin: 0 0 28px;
}

/* Section Headings */
.section-title {
    font-size: 1.5rem;
    font-weight: 800;
    margin: 0 0 12px;
    letter-spacing: 0.04em;
}

/* Pill Buttons */
.btn-pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 28px;
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    border-radius: 9999px;
    border: 1px solid var(--border-black);
    background-color: var(--text-black);
    color: var(--bg-white);
    text-decoration: none;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s, opacity 0.2s;
}

.btn-pill:hover {
    background-color: var(--bg-white);
    color: var(--text-black);
}

.btn-pill:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-outline {
    background-color: var(--bg-white);
    color: var(--text-black);
}

.btn-outline:hover {
    background-color: var(--text-black);
    color: var(--bg-white);
}

.btn-full {
    width: 100%;
    padding: 16px 32px;
    font-size: 0.95rem;
}

/* Forms */
.form-group {
    margin-bottom: 28px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

@media (max-width: 600px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

.form-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.badge-req {
    font-size: 0.68rem;
    background: var(--text-black);
    color: var(--bg-white);
    padding: 1px 7px;
    font-weight: 700;
    letter-spacing: 0.05em;
}

.badge-opt {
    font-size: 0.68rem;
    border: 1px solid var(--border-black);
    color: var(--text-black);
    padding: 1px 7px;
    font-weight: 700;
    letter-spacing: 0.05em;
}

.form-control {
    width: 100%;
    padding: 12px 14px;
    font-size: 0.95rem;
    font-family: inherit;
    color: var(--text-black);
    background: var(--bg-white);
    border: 1px solid var(--border-black);
    border-radius: 0;
    outline: none;
    transition: background-color 0.15s;
}

.form-control:focus {
    background-color: var(--bg-subtle);
}

.form-control[readonly] {
    background-color: var(--bg-subtle);
    color: var(--text-muted);
}

.radio-group {
    display: flex;
    gap: 28px;
    padding: 10px 0;
    flex-wrap: wrap;
}

.radio-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
}

.radio-label input[type="radio"] {
    accent-color: #000000;
    width: 18px;
    height: 18px;
}

/* Password Complexity Checklist */
.policy-checklist {
    list-style: none;
    padding: 16px 20px;
    margin: 12px 0 0;
    border: 1px solid var(--border-light);
    background: var(--bg-subtle);
    font-size: 0.82rem;
}

.policy-checklist li {
    margin-bottom: 6px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 8px;
}

.policy-checklist li:last-child {
    margin-bottom: 0;
}

.policy-checklist li.ok {
    color: var(--text-black);
    font-weight: 700;
}

/* Info Box & Status Messages */
.notice-panel {
    background: var(--bg-subtle);
    border-left: 3px solid var(--border-black);
    padding: 16px 20px;
    font-size: 0.88rem;
    margin-bottom: 32px;
}

.status-message {
    margin-top: 24px;
    padding: 16px;
    border: 1px solid var(--border-black);
    font-size: 0.9rem;
    font-weight: 700;
    display: none;
}

.status-message.show {
    display: block;
}

/* Honeypot Field */
.hp-field {
    position: absolute;
    left: -9999px;
    opacity: 0;
    height: 0;
    overflow: hidden;
}

/* Footer */
.site-footer {
    border-top: 1px solid var(--border-black);
    padding: 32px 24px;
    text-align: center;
    font-size: 0.78rem;
    color: var(--text-muted);
    letter-spacing: 0.08em;
}