:root {
    --bg: #faf9f6;
    --bg-warm: #f3f1ec;
    --bg-panel: #ffffff;
    --bg-code: #171923;
    --ink: #111117;
    --ink-soft: #3d3d4a;
    --ink-muted: #7a7a8a;
    --ink-faint: #b0b0ba;
    --accent: #0d9668;
    --accent-light: #e6f5ef;
    --border: #e2e0db;
    --border-dark: #ccc9c2;
    --shadow: 0 20px 45px rgba(17, 23, 29, 0.08);
    --font-body: 'Satoshi', sans-serif;
    --font-serif: 'Instrument Serif', serif;
    --font-mono: 'DM Mono', monospace;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--ink);
    -webkit-font-smoothing: antialiased;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        radial-gradient(circle at top right, rgba(13, 150, 104, 0.08), transparent 24%),
        linear-gradient(180deg, var(--bg) 0%, var(--bg-warm) 100%);
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.site-shell {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 28px 72px;
}

.site-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    padding: 24px 0 18px;
}

.site-brand {
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 1.8px;
    color: var(--ink);
}

.site-brand em {
    font-style: normal;
    color: var(--ink-muted);
    margin-left: 8px;
    font-size: 12px;
    letter-spacing: 0.6px;
}

.site-nav-links {
    display: flex;
    gap: 18px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.site-nav-links a {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--ink-soft);
}

.hero-panel,
.content-panel,
.doc-card,
.step-card,
.code-card,
.notice-card {
    background: rgba(255, 255, 255, 0.82);
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
}

.hero-panel {
    padding: 44px 40px;
    margin-bottom: 28px;
}

.eyebrow {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 2.2px;
    text-transform: uppercase;
    color: var(--ink-muted);
    margin: 0 0 12px;
}

.hero-title,
.section-title {
    margin: 0 0 14px;
    font-family: var(--font-serif);
    font-weight: 400;
    line-height: 1.08;
    color: var(--ink);
}

.hero-title {
    font-size: clamp(36px, 5vw, 64px);
    max-width: 820px;
}

.section-title {
    font-size: clamp(30px, 4vw, 44px);
}

.hero-copy,
.section-copy,
.card-copy,
.step-copy,
.notice-copy {
    margin: 0;
    color: var(--ink-soft);
    line-height: 1.75;
    font-size: 17px;
}

.hero-copy {
    max-width: 780px;
}

.hero-actions {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    margin-top: 28px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 0 20px;
    border-radius: 10px;
    border: 1px solid var(--border-dark);
    font-weight: 700;
    font-size: 15px;
    text-decoration: none;
    transition: transform 0.16s ease, box-shadow 0.16s ease, background 0.16s ease;
}

.btn:hover {
    text-decoration: none;
    transform: translateY(-1px);
}

.btn-primary {
    background: var(--ink);
    color: var(--bg);
    border-color: var(--ink);
}

.btn-primary:hover {
    box-shadow: 0 14px 30px rgba(13, 150, 104, 0.18);
    background: var(--accent);
    border-color: var(--accent);
}

.btn-secondary {
    background: transparent;
    color: var(--ink);
}

.section-block {
    margin-top: 24px;
}

.content-panel {
    padding: 36px 32px;
}

.doc-grid,
.step-grid,
.notice-grid {
    display: grid;
    gap: 18px;
}

.doc-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 26px;
}

.step-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 24px;
}

.notice-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 20px;
}

.doc-card,
.step-card,
.notice-card {
    padding: 26px 24px;
}

.card-title,
.step-title,
.notice-title {
    margin: 0 0 10px;
    font-size: 20px;
    color: var(--ink);
}

.card-meta,
.step-meta {
    margin: 0 0 12px;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 1px;
    color: var(--ink-muted);
}

.doc-links {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 18px;
}

.doc-links a {
    font-family: var(--font-mono);
    font-size: 12px;
}

.code-section {
    display: grid;
    gap: 18px;
    margin-top: 24px;
}

.code-card {
    overflow: hidden;
}

.code-card-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    background: rgba(23, 25, 35, 0.95);
    color: #f6f7fb;
}

.code-card-head strong {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 1.5px;
    text-transform: uppercase;
}

.code-card-head span {
    font-size: 13px;
    color: rgba(246, 247, 251, 0.64);
}

.code-card pre {
    margin: 0;
    padding: 20px;
    overflow-x: auto;
    background: var(--bg-code);
    color: #d8fbe8;
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.7;
}

.code-card code {
    font-family: inherit;
}

.list-block {
    margin: 18px 0 0;
    padding-left: 20px;
    color: var(--ink-soft);
    line-height: 1.8;
}

.list-block li + li {
    margin-top: 8px;
}

.inline-code {
    font-family: var(--font-mono);
    font-size: 0.95em;
    background: var(--accent-light);
    color: var(--ink);
    padding: 2px 6px;
    border-radius: 6px;
}

.support-box {
    margin-top: 20px;
    padding: 18px 20px;
    border-radius: 14px;
    background: var(--bg-warm);
    border: 1px solid var(--border);
    color: var(--ink-soft);
    line-height: 1.75;
}

.page-footer {
    padding-top: 34px;
    text-align: center;
    color: var(--ink-muted);
    font-size: 13px;
}

@media (max-width: 900px) {
    .doc-grid,
    .step-grid,
    .notice-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 700px) {
    .site-shell {
        padding: 0 18px 56px;
    }

    .site-nav {
        padding-top: 18px;
        align-items: flex-start;
        flex-direction: column;
    }

    .hero-panel,
    .content-panel {
        padding: 28px 22px;
    }
}