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

:root {
    --sph-bg: #f5f6f3;
    --sph-sage: #5f7466;
    --sph-sage-deep: #4e6155;
    --sph-sage-soft: #e6ebe6;
    --sph-ochre: #c2a15f;
    --sph-ochre-soft: #f4eddf;
    --sph-text: #2c322e;
    --sph-muted: #545d57;
    --sph-card: #ffffff;
    --sph-line: #d9ded8;
    --sph-font: Verdana, Geneva, sans-serif;
    --sph-round-s: 6px;
    --sph-round-m: 8px;
}

html { overflow-x: hidden; }

body {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    background: var(--sph-bg);
    font-family: var(--sph-font);
    font-size: 15px;
    line-height: 1.7;
    color: var(--sph-text);
    overflow-x: hidden;
}

a {
    color: var(--sph-sage-deep);
    text-decoration: underline;
    text-decoration-color: var(--sph-ochre);
    text-underline-offset: 3px;
}
a:hover { color: var(--sph-text); }

/* ---- header band ---- */
.sph-masthead {
    height: 56px;
    display: flex;
    align-items: center;
    padding: 0 16px;
    background: var(--sph-sage);
    border-bottom: 1px solid var(--sph-sage-deep);
}
.sph-masthead-inner {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
}
.sph-wordmark {
    font-size: 17px;
    font-weight: 700;
    letter-spacing: .14em;
    color: #f5f6f3;
    text-decoration: none;
}
.sph-wordmark:hover { color: #ffffff; }

/* ---- document ---- */
.sph-paper {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    padding: 36px 16px 60px;
}
.sph-paper-head {
    padding-bottom: 24px;
    margin-bottom: 4px;
    border-bottom: 2px solid var(--sph-sage);
}
.sph-paper-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px 12px;
    margin-bottom: 12px;
    font-size: 12px;
    color: var(--sph-muted);
}
.sph-paper-meta-item {
    display: inline-flex;
    align-items: center;
    gap: 7px;
}
.sph-paper-meta-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--sph-ochre);
    flex: 0 0 auto;
}
.sph-paper-title {
    font-size: clamp(22px, 3.6vw, 32px);
    font-weight: 700;
    line-height: 1.3;
    color: var(--sph-text);
    margin-bottom: 14px;
}
.sph-paper-about {
    max-width: 720px;
    padding: 12px 16px;
    background: var(--sph-card);
    border: 1px solid var(--sph-line);
    border-left: 3px solid var(--sph-ochre);
    border-radius: var(--sph-round-s);
    font-size: 14px;
    color: var(--sph-muted);
}
.sph-paper-about strong { color: var(--sph-text); }

/* ---- key / value rows ---- */
.sph-row {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 12px 32px;
    padding: 26px 0;
    border-bottom: 1px solid var(--sph-line);
}
.sph-row:last-of-type { border-bottom: 0; }
.sph-row-key { align-self: start; }
.sph-row-num {
    display: block;
    margin-bottom: 4px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .08em;
    color: #7a6536;
}
.sph-row-title {
    font-size: 16px;
    font-weight: 700;
    line-height: 1.4;
    color: var(--sph-sage-deep);
}
.sph-row-body { min-width: 0; color: var(--sph-muted); }
.sph-row-body p { margin-bottom: 12px; }
.sph-row-body p:last-child { margin-bottom: 0; }
.sph-row-body strong { color: var(--sph-text); }
.sph-row-body ul,
.sph-row-body ol {
    margin: 0 0 12px;
    padding-left: 0;
    list-style: none;
}
.sph-row-body ul:last-child,
.sph-row-body ol:last-child { margin-bottom: 0; }
.sph-row-body li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 7px;
}
.sph-row-body ul > li::before {
    content: "";
    position: absolute;
    left: 3px;
    top: .72em;
    width: 6px;
    height: 6px;
    border: 1px solid var(--sph-sage);
    transform: rotate(45deg);
}
.sph-row-body ol { counter-reset: sphCount; }
.sph-row-body ol > li {
    counter-increment: sphCount;
    padding-left: 28px;
}
.sph-row-body ol > li::before {
    content: counter(sphCount) ")";
    position: absolute;
    left: 0;
    top: 0;
    font-weight: 700;
    color: var(--sph-sage-deep);
}

/* note box */
.sph-note {
    margin: 14px 0;
    padding: 14px 16px;
    background: var(--sph-sage-soft);
    border-radius: var(--sph-round-s);
    border: 1px solid #cdd6ce;
}
.sph-note p { margin: 0; color: var(--sph-text); font-size: 14px; }

/* definition list */
.sph-defs {
    margin: 12px 0;
    border: 1px solid var(--sph-line);
    border-radius: var(--sph-round-m);
    background: var(--sph-card);
    overflow: hidden;
}
.sph-defs-line {
    display: grid;
    grid-template-columns: minmax(130px, 36%) minmax(0, 1fr);
    gap: 4px 14px;
    padding: 10px 14px;
    font-size: 14px;
    border-top: 1px solid var(--sph-line);
}
.sph-defs-line:first-child { border-top: 0; }
.sph-defs dt { font-weight: 700; color: var(--sph-text); }
.sph-defs dd { color: var(--sph-muted); }

/* table */
.sph-matrix-wrap { overflow-x: auto; margin: 12px 0; }
.sph-matrix {
    width: 100%;
    border-collapse: collapse;
    background: var(--sph-card);
    border: 1px solid var(--sph-line);
    font-size: 14px;
}
.sph-matrix th {
    text-align: left;
    padding: 10px 12px;
    background: var(--sph-sage-soft);
    color: var(--sph-text);
    font-weight: 700;
    border-bottom: 1px solid #cdd6ce;
}
.sph-matrix td {
    padding: 10px 12px;
    border-top: 1px solid var(--sph-line);
    color: var(--sph-muted);
    vertical-align: top;
}

/* chips */
.sph-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 0 0 12px;
}
.sph-chip {
    display: inline-block;
    padding: 3px 11px;
    border-radius: 999px;
    background: var(--sph-card);
    border: 1px solid #cdd6ce;
    font-size: 12px;
    font-weight: 700;
    color: var(--sph-sage-deep);
}

.sph-paper-end {
    margin-top: 8px;
    padding-top: 18px;
    border-top: 2px solid var(--sph-sage);
    font-size: 13px;
    color: var(--sph-muted);
}

@media (max-width: 720px) {
    .sph-paper { padding-top: 28px; }
    .sph-row {
        grid-template-columns: 1fr;
        gap: 10px;
        padding: 22px 0;
    }
    .sph-row-key {
        display: flex;
        align-items: baseline;
        gap: 10px;
    }
    .sph-row-num { margin-bottom: 0; }
}
@media (max-width: 480px) {
    .sph-defs-line { grid-template-columns: 1fr; }
}

/* ---- footer ---- */
.sph-foot {
    margin-top: auto;
    flex-shrink: 0;
    padding: 26px 16px 24px;
    text-align: center;
    background: #e9ece7;
    border-top: 1px solid var(--sph-line);
    color: var(--sph-muted);
}
.sph-foot-inner {
    max-width: 860px;
    margin: 0 auto;
}
.sph-foot-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 20px;
    margin-bottom: 14px;
}
.sph-foot-links a {
    font-size: 12px;
    color: var(--sph-sage-deep);
}
.sph-foot-links a:hover { color: var(--sph-text); }
.sph-foot-copy {
    margin-bottom: 10px;
    font-size: 12px;
    color: var(--sph-muted);
}
.sph-foot-legal {
    max-width: 740px;
    margin: 0 auto;
    font-size: 11px;
    line-height: 1.7;
    color: #5e6760;
}