:root {
    --bg-ink: #0B0E12;
    --bg-mid: #131A23;
    --bg-warm: #1C1B1E;
    --paper: rgba(255, 255, 255, 0.05);
    --paper-strong: rgba(255, 255, 255, 0.09);
    --line: rgba(255, 255, 255, 0.12);
    --ink: #F8FAFC;
    --muted: #B4BDC7;
    --accent: #F97316;
    --accent-2: #22D3EE;
    --shadow: rgba(7, 10, 15, 0.55);
    --transition: 0.22s ease-out;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    color: var(--ink);
    background:
        radial-gradient(circle at 10% 10%, rgba(249, 115, 22, 0.18), transparent 45%),
        radial-gradient(circle at 90% 10%, rgba(34, 211, 238, 0.16), transparent 50%),
        linear-gradient(160deg, var(--bg-ink), var(--bg-mid) 45%, var(--bg-warm) 100%);
    font-family: "Avenir Next", "Futura", "Gill Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
    line-height: 1.7;
}

body {
    display: flex;
    justify-content: center;
}

main {
    width: min(1040px, 100%);
    padding: 44px 20px 70px;
}

.frame {
    position: relative;
}

.frame::before {
    content: "";
    position: absolute;
    inset: -18px;
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: linear-gradient(120deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.02));
    z-index: -1;
}

header {
    display: grid;
    gap: 14px;
    padding: 20px 22px 24px;
    border-radius: 18px;
    background: var(--paper);
    border: 1px solid rgba(255, 255, 255, 0.10);
    box-shadow: 0 18px 44px var(--shadow);
}

.lang-nav {
    display: flex;
    justify-content: flex-end;
}

.lang-link {
    color: var(--muted);
    text-decoration: none;
    border: 1px solid rgba(255, 255, 255, 0.20);
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 0.85rem;
    transition: all var(--transition);
}

.lang-link:hover {
    color: var(--ink);
    border-color: var(--accent-2);
    background: rgba(34, 211, 238, 0.12);
}

.hero-title {
    font-family: "Didot", "Bodoni MT", "Hiragino Mincho ProN", "Yu Mincho", serif;
    font-size: clamp(2.2rem, 4vw, 3.1rem);
    letter-spacing: 0.10em;
    margin: 0;
}

.hero-subtitle {
    margin: 0;
    color: var(--muted);
    letter-spacing: 0.20em;
    font-size: 0.9rem;
}

.hero-tagline {
    margin: 6px 0 0;
    font-size: 1.02rem;
    max-width: 760px;
    color: #E2E8F0;
}

section {
    margin-top: 26px;
    padding: 22px 22px;
    border-radius: 16px;
    background: var(--paper);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 14px 36px var(--shadow);
}

h2 {
    margin: 0 0 12px;
    font-size: 1.1rem;
    letter-spacing: 0.07em;
}

.usage-title {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    padding: 8px 16px;
    border-radius: 999px;
    background: rgba(249, 115, 22, 0.14);
    border: 1px solid rgba(249, 115, 22, 0.35);
    margin-bottom: 14px;
}

.usage-title::before {
    content: "";
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 14px rgba(249, 115, 22, 0.8);
}

p {
    margin: 0 0 12px;
    color: #E2E8F0;
}

.link-list {
    list-style: none;
    padding: 0;
    margin: 14px 0 0;
    display: grid;
    gap: 12px;
}

.link-anchor {
    display: block;
    padding: 14px 16px;
    border-radius: 14px;
    text-decoration: none;
    color: var(--ink);
    background: var(--paper-strong);
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition: transform var(--transition), background var(--transition), border var(--transition);
}

.link-anchor:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(34, 211, 238, 0.40);
}

.label {
    display: block;
    font-weight: 700;
    font-size: 0.98rem;
}

.desc {
    display: block;
    color: var(--muted);
    margin-top: 4px;
    font-size: 0.86rem;
}

.demo-section {
    border: 1px solid rgba(34, 197, 94, 0.45);
    background: linear-gradient(140deg, rgba(34, 197, 94, 0.18), rgba(56, 189, 248, 0.08));
}

.demo-section .usage-title {
    background: rgba(34, 197, 94, 0.18);
    border: 1px solid rgba(34, 197, 94, 0.5);
}

.demo-section .usage-title::before {
    background: #22C55E;
    box-shadow: 0 0 14px rgba(34, 197, 94, 0.7);
}

.prompt-wrapper {
    margin-top: 14px;
}

.prompt-box {
    width: 100%;
    min-height: 150px;
    padding: 12px 14px;
    border-radius: 12px;
    background: rgba(3, 7, 18, 0.85);
    color: #E2E8F0;
    font-family: "IBM Plex Mono", "SFMono-Regular", "Menlo", monospace;
    font-size: 0.88rem;
    line-height: 1.6;
    border: 1px solid rgba(255, 255, 255, 0.10);
    resize: vertical;
}

.prompt-actions {
    margin-top: 10px;
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.btn-copy {
    padding: 6px 16px;
    font-size: 0.85rem;
    border-radius: 999px;
    border: none;
    cursor: pointer;
    background: rgba(34, 211, 238, 0.20);
    color: var(--ink);
    transition: transform var(--transition), background var(--transition);
}

.btn-copy:hover {
    transform: translateY(-1px);
    background: rgba(34, 211, 238, 0.35);
}

.prompt-note {
    margin-top: 6px;
    color: var(--muted);
    font-size: 0.82rem;
}

.offline-callout {
    margin-top: 14px;
    padding: 12px 14px;
    border-radius: 12px;
    background: rgba(248, 250, 252, 0.08);
    border: 1px solid rgba(248, 250, 252, 0.16);
}

.offline-callout p {
    margin: 0 0 8px;
    font-size: 0.9rem;
}

.offline-callout a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--accent-2);
    text-decoration: none;
    font-weight: 700;
}

.offline-callout a:hover {
    color: #A5F3FC;
}

footer {
    margin-top: 34px;
    padding: 18px 16px;
    border-radius: 14px;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.08);
    text-align: center;
    color: var(--muted);
    font-size: 0.82rem;
}

@media (max-width: 780px) {
    main {
        padding: 28px 16px 52px;
    }

    header {
        padding: 18px 18px 22px;
    }

    section {
        padding: 18px 18px;
    }

    .usage-title {
        font-size: 1.12rem;
        flex-wrap: wrap;
    }
}

/* Constitution Grid Layout */
.constitution-grid {
    display: grid;
    gap: 24px;
    margin-top: 20px;
}



.constitution-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    padding: 24px;
    position: relative;
    overflow: hidden;
}

.constitution-item::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--accent);
    opacity: 0.7;
}

.constitution-item:last-child::before {
    background: var(--accent-2);
}

.constitution-label {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--muted);
    margin-bottom: 12px;
    text-transform: uppercase;
}

.constitution-text {
    font-family: "Didot", "Bodoni MT", "Hiragino Mincho ProN", "Yu Mincho", serif;
    font-size: 1.1rem;
    line-height: 1.9;
    color: #F8FAFC;
    margin: 0;
    letter-spacing: 0.08em;
}