:root {
    --bg-base: #f8f5ef;
    --bg-panel: #ffffff;
    --bg-soft: #f1f4f2;
    --ink-primary: #1f1f1f;
    --ink-muted: rgba(31, 31, 31, 0.6);
    --accent-terracotta: #e79c74;
    --accent-sage: #8fb7a7;
    --accent-sky: #8fb7d6;
    --border: rgba(31, 31, 31, 0.08);
    --shadow: 0 22px 44px rgba(50, 60, 60, 0.08);
    --radius-lg: 36px;
    --radius-md: 22px;
    --font-heading: 'Fraunces', serif;
    --font-body: 'Inter', sans-serif;
}

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

body {
    min-height: 100vh;
    background: radial-gradient(140% 150% at 100% 0%, rgba(143, 183, 214, 0.18), rgba(248, 245, 239, 1));
    color: var(--ink-primary);
    font-family: var(--font-body);
    display: grid;
    grid-template-rows: auto 1fr auto;
}

a {
    color: inherit;
    text-decoration: none;
}

.mast {
    padding: clamp(2rem, 6vw, 4rem) clamp(1.5rem, 5vw, 4rem);
    display: grid;
    gap: clamp(1.6rem, 4vw, 2.2rem);
}

.mast-brand {
    display: inline-flex;
    align-items: center;
    gap: 1rem;
}

.mark {
    width: 52px;
    height: 52px;
    border-radius: 16px;
    display: grid;
    place-items: center;
    background: linear-gradient(140deg, rgba(231, 156, 116, 0.4), rgba(143, 183, 214, 0.36));
    color: #fff;
    font-family: var(--font-heading);
    letter-spacing: 0.2em;
    box-shadow: var(--shadow);
}

.mast-brand span:last-child {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    letter-spacing: 0.18em;
}

.mast-title {
    max-width: 720px;
}

.badge {
    display: inline-block;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    font-size: 0.7rem;
    color: var(--accent-terracotta);
    margin-bottom: 0.8rem;
}

.mast-title h1 {
    font-family: var(--font-heading);
    font-size: clamp(2.3rem, 4vw, 3rem);
    margin-bottom: 1rem;
}

.mast-title p {
    color: var(--ink-muted);
    line-height: 1.8;
}

.columns {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: clamp(2rem, 4vw, 3rem);
    padding: 0 clamp(1.5rem, 5vw, 4rem) clamp(3rem, 6vw, 5rem);
}

.index {
    position: sticky;
    top: 100px;
    align-self: start;
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    padding: 2rem 1.8rem;
    box-shadow: var(--shadow);
}

.index nav {
    display: grid;
    gap: 1rem;
}

.index-link {
    font-size: 0.9rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--ink-muted);
    position: relative;
    padding-left: 1.6rem;
}

.index-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(31, 31, 31, 0.15);
    transform: translateY(-50%);
}

.index-link.active,
.index-link:hover {
    color: var(--ink-primary);
}

.index-link.active::before {
    background: var(--accent-sage);
}

.document {
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    padding: clamp(2.3rem, 4vw, 3rem);
    display: grid;
    gap: 2.4rem;
}

section h2 {
    font-family: var(--font-heading);
    font-size: 1.85rem;
    margin-bottom: 1rem;
}

section p {
    color: var(--ink-muted);
    margin-bottom: 0.8rem;
    line-height: 1.8;
}

section ul {
    margin-left: 1.4rem;
    color: var(--ink-muted);
    display: grid;
    gap: 0.7rem;
    line-height: 1.7;
}

section ul li strong {
    color: var(--ink-primary);
}

.mark-date {
    letter-spacing: 0.28em;
    text-transform: uppercase;
    font-size: 0.75rem;
    color: var(--accent-sage);
    margin-right: 1rem;
}

.footer {
    padding: 2.6rem;
    text-align: center;
    letter-spacing: 0.26em;
    text-transform: uppercase;
    font-size: 0.7rem;
    color: var(--ink-muted);
}

.footer a {
    color: var(--accent-terracotta);
}

@media (max-width: 880px) {
    .columns {
        grid-template-columns: 1fr;
    }

    .index {
        position: static;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
        gap: 1rem;
    }

    .index-link {
        padding-left: 1.2rem;
        font-size: 0.8rem;
    }
}

@media (max-width: 560px) {
    .columns {
        padding: 0 1.5rem 3.2rem;
    }

    .document {
        padding: 2rem;
    }
}