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

:root {
    --cocoa-uml: #3d2320;
    --rust-uml: #8a5248;
    --coral-uml: #f0603a;
    --ink-uml: #2c1a17;
    --linen-uml: #fbf4f1;
    --card-uml: #ffffff;
    --clay-uml: #7a5850;
    --edge-uml: #ecdcd6;
    --body-uml: "Trebuchet MS", "Segoe UI", Tahoma, sans-serif;
    --head-uml: "Trebuchet MS", "Segoe UI", Tahoma, sans-serif;
    --round-uml: 10px;
    --round-lg-uml: 18px;
    --glow1-uml: 0 6px 16px rgba(44, 26, 23, .07);
    --glow2-uml: 0 14px 32px rgba(44, 26, 23, .12);
}

html { scroll-behavior: smooth; }

body {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    font-family: var(--body-uml);
    background:
        linear-gradient(180deg, rgba(138, 82, 72, .1) 0%, rgba(251, 244, 241, 0) 46%),
        var(--linen-uml);
    color: var(--ink-uml);
    line-height: 1.72;
    font-size: 16px;
}

a {
    color: var(--rust-uml);
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: color .2s ease;
}
a:hover { color: var(--coral-uml); }

/* ---------- top ---------- */
.top-uml {
    padding: 22px 20px 20px;
    background: rgba(61, 35, 32, .97);
    backdrop-filter: blur(10px);
    border-bottom: 3px solid var(--coral-uml);
}
.top-inner-uml {
    max-width: 1100px;
    margin: 0 auto;
    text-align: center;
}
.top-brand-uml {
    display: inline-block;
    font-family: var(--head-uml);
    font-size: 21px;
    font-weight: 700;
    letter-spacing: .26em;
    text-indent: .26em;
    text-transform: uppercase;
    color: #ffffff;
    text-decoration: none;
}
.top-brand-uml:hover { color: var(--coral-uml); }

/* ---------- doc header ---------- */
.doc-top-uml {
    max-width: 860px;
    margin: 0 auto;
    padding: 52px 22px 20px;
    text-align: center;
}
.doc-h1-uml {
    font-family: var(--head-uml);
    font-size: clamp(27px, 4.4vw, 42px);
    font-weight: 800;
    line-height: 1.22;
    color: var(--cocoa-uml);
}
.doc-sub-uml {
    display: block;
    margin: 14px auto 0;
    max-width: 620px;
    font-size: 16px;
    color: var(--clay-uml);
}
.doc-stamp-uml {
    display: inline-block;
    margin-top: 20px;
    padding: 7px 16px;
    border-radius: 999px;
    background: rgba(240, 96, 58, .12);
    border: 1px solid rgba(240, 96, 58, .45);
    font-size: 13px;
    font-weight: 700;
    color: var(--ink-uml);
}

/* ---------- centered-heading parts ---------- */
.doc-body-uml {
    max-width: 780px;
    width: 100%;
    margin: 0 auto;
    padding: 20px 22px 70px;
}
.part-uml {
    padding: 28px 0;
    border-bottom: 1px solid var(--edge-uml);
}
.part-uml:last-child { border-bottom: none; }
.part-title-uml {
    text-align: center;
    font-family: var(--head-uml);
    font-size: clamp(19px, 2.5vw, 25px);
    font-weight: 800;
    line-height: 1.3;
    color: var(--cocoa-uml);
    margin-bottom: 20px;
}
.part-title-uml::after {
    content: "";
    display: block;
    width: 54px;
    height: 3px;
    margin: 12px auto 0;
    border-radius: 3px;
    background: var(--coral-uml);
}
.part-body-uml p { margin-bottom: 12px; color: var(--clay-uml); }
.part-body-uml p:last-child { margin-bottom: 0; }
.part-body-uml strong { color: var(--ink-uml); }
.part-body-uml ul,
.part-body-uml ol {
    margin: 0 0 12px;
    padding-left: 0;
    list-style: none;
    color: var(--clay-uml);
}
.part-body-uml ol { counter-reset: umlOrd; }
.part-body-uml li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 8px;
}
.part-body-uml ul > li::before {
    content: "";
    position: absolute;
    left: 2px;
    top: .55em;
    width: 10px;
    height: 10px;
    border: 2px solid var(--coral-uml);
    border-radius: 3px;
}
.part-body-uml ol > li {
    counter-increment: umlOrd;
    padding-left: 30px;
}
.part-body-uml ol > li::before {
    content: counter(umlOrd);
    position: absolute;
    left: 0;
    top: -.05em;
    width: 21px;
    height: 21px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    font-size: 11px;
    font-weight: 700;
    color: #fff;
    background: var(--coral-uml);
}

/* ---------- accents ---------- */
.hint-uml {
    margin: 14px auto 4px;
    max-width: 620px;
    padding: 16px 18px;
    border: 1px solid rgba(240, 96, 58, .4);
    border-radius: var(--round-uml);
    background: rgba(240, 96, 58, .08);
}
.hint-uml p { color: var(--ink-uml); margin: 0; font-size: 15px; }

.pairbox-uml {
    margin: 12px auto;
    max-width: 640px;
    display: grid;
    gap: 10px;
}
.pairrow-uml {
    display: grid;
    grid-template-columns: minmax(140px, 34%) 1fr;
    gap: 4px 16px;
    padding: 12px 14px;
    background: var(--card-uml);
    border: 1px solid var(--edge-uml);
    border-radius: var(--round-uml);
    box-shadow: var(--glow1-uml);
    font-size: 15px;
}
.pairrow-k-uml { font-weight: 700; color: var(--cocoa-uml); }
.pairrow-v-uml { color: var(--clay-uml); }
@media (max-width: 560px) {
    .pairrow-uml { grid-template-columns: 1fr; }
}

.plate-uml {
    width: 100%;
    max-width: 640px;
    margin: 14px auto;
    border-collapse: collapse;
    font-size: 15px;
    background: var(--card-uml);
    border: 1px solid var(--edge-uml);
    border-radius: var(--round-uml);
    overflow: hidden;
}
.plate-uml th {
    background: var(--cocoa-uml);
    color: #ffffff;
    text-align: left;
    padding: 12px 14px;
    font-size: 14px;
    font-weight: 700;
}
.plate-uml td {
    padding: 11px 14px;
    border-top: 1px solid var(--edge-uml);
    color: var(--clay-uml);
}
.plate-uml tr:nth-child(even) td { background: rgba(138, 82, 72, .05); }

.marks-uml {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 12px 0;
    justify-content: center;
}
.marker-uml {
    display: inline-block;
    padding: 5px 12px;
    border-radius: 999px;
    border: 1px solid var(--edge-uml);
    background: var(--card-uml);
    font-size: 13px;
    font-weight: 700;
    color: var(--cocoa-uml);
}

.finis-uml {
    max-width: 780px;
    margin: 0 auto;
    padding: 0 22px 60px;
}
.finis-inner-uml {
    padding: 20px 22px;
    border: 1px dashed rgba(138, 82, 72, .45);
    border-radius: var(--round-lg-uml);
    background: rgba(255, 255, 255, .7);
    font-size: 15px;
    color: var(--clay-uml);
    text-align: center;
}

@media (max-width: 620px) {
    .doc-top-uml { padding-top: 40px; }
}

/* ---------- footer ---------- */
.foot-uml {
    margin-top: auto;
    flex-shrink: 0;
    background: var(--cocoa-uml);
    color: #d8c4bd;
    padding: 26px 20px 24px;
    text-align: center;
    border-top: 3px solid var(--coral-uml);
}
.foot-inner-uml {
    max-width: 900px;
    margin: 0 auto;
}
.foot-nav-uml {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 22px;
    margin-bottom: 14px;
}
.foot-nav-uml a {
    color: #d8c4bd;
    font-size: 12px;
    text-decoration: none;
    border-bottom: 1px solid rgba(240, 96, 58, .5);
    padding-bottom: 2px;
}
.foot-nav-uml a:hover { color: var(--coral-uml); }
.foot-line-uml {
    font-size: 12px;
    color: #d8c4bd;
    margin-bottom: 10px;
}
.foot-legal-uml {
    font-size: 11px;
    line-height: 1.7;
    color: #b79e97;
    max-width: 760px;
    margin: 0 auto;
}