:root {
    --color-bg: #FBF7F2;
    --color-surface: #FFFFFF;
    --color-text: #1B1F2A;
    --color-muted: #5B6475;
    --color-border: #D9D2C8;
    --color-primary: #2E5EAA;
    --color-secondary: #7A4E9D;
    --color-accent: #E07A5F;
    --radius: 14px;
    --shadow: 0 10px 30px rgba(27,31,42,0.10);
    --maxw: 1120px;
}

* {
    box-sizing: border-box;
}

body {
    font-family: Georgia, 'Times New Roman', serif;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-areas: 
        "header"
        "main"
        "aside"
        "footer";
    grid-template-rows: auto 1fr auto auto;
    min-height: 100vh;
}

@media (min-width: 768px) {
    body {
        grid-template-areas: 
            "header header"
            "main aside"
            "footer footer";
        grid-template-columns: 1fr 280px;
        grid-template-rows: auto 1fr auto;
        gap: 2rem;
        padding: 0 1rem;
    }
}

@media (min-width: 1024px) {
    body {
        max-width: var(--maxw);
        margin: 0 auto;
        padding: 0 2rem;
        gap: 3rem;
    }
}

header {
    grid-area: header;
    background-color: var(--color-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin: 1rem;
    padding: 1rem 1.5rem;
}

@media (min-width: 768px) {
    header {
        margin: 1rem 0 0 0;
    }
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.nav-brand {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
    color: var(--color-primary);
}

.nav-links {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 1.5rem;
}

.nav-links a {
    color: var(--color-text);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: calc(var(--radius) / 2);
    transition: all 0.2s ease;
}

@media (prefers-reduced-motion: reduce) {
    .nav-links a {
        transition: none;
    }
}

.nav-links a:hover,
.nav-links a:focus-visible {
    background-color: var(--color-primary);
    color: var(--color-surface);
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.nav-links a[aria-current="page"] {
    background-color: var(--color-accent);
    color: var(--color-surface);
}

main {
    grid-area: main;
    background-color: var(--color-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin: 0 1rem;
    padding: 2rem;
}

@media (min-width: 768px) {
    main {
        margin: 0;
    }
}

aside {
    grid-area: aside;
    background-color: var(--color-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin: 0 1rem;
    padding: 1.5rem;
}

@media (min-width: 768px) {
    aside {
        margin: 0;
        align-self: start;
        position: sticky;
        top: 1rem;
    }
}

footer {
    grid-area: footer;
    text-align: center;
    padding: 2rem 1rem;
    color: var(--color-muted);
    font-size: 0.9rem;
}

h1 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    line-height: 1.2;
    color: var(--color-primary);
    margin: 0 0 1.5rem 0;
}

h2 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    line-height: 1.3;
    color: var(--color-secondary);
    margin: 2rem 0 1rem 0;
}

h3 {
    font-size: clamp(1.1rem, 2.5vw, 1.25rem);
    line-height: 1.4;
    color: var(--color-text);
    margin: 1.5rem 0 0.75rem 0;
}

p {
    margin: 0 0 1.25rem 0;
    max-width: 65ch;
}

a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 0.2em;
    transition: all 0.2s ease;
}

@media (prefers-reduced-motion: reduce) {
    a {
        transition: none;
    }
}

a:hover,
a:focus-visible {
    color: var(--color-accent);
    text-underline-offset: 0.3em;
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

a[rel="external"]::after {
    content: " ↗";
    font-size: 0.8em;
    color: var(--color-muted);
}

.breadcrumbs {
    list-style: none;
    margin: 0 0 2rem 0;
    padding: 0;
    display: flex;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--color-muted);
}

.breadcrumbs li:not(:last-child)::after {
    content: " / ";
    margin-left: 0.5rem;
    color: var(--color-border);
}

.breadcrumbs a {
    color: var(--color-primary);
    text-decoration: none;
}

.breadcrumbs a:hover {
    text-decoration: underline;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    background-color: var(--color-surface);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

@media (max-width: 767px) {
    table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }
}

caption {
    font-weight: bold;
    color: var(--color-secondary);
    padding: 1rem;
    text-align: left;
    background-color: var(--color-bg);
    font-size: 1.1rem;
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

th {
    background-color: var(--color-primary);
    color: var(--color-surface);
    font-weight: bold;
    position: relative;
}

@media (min-width: 1024px) {
    th {
        position: sticky;
        top: 0;
        z-index: 10;
    }
}

tbody tr:hover {
    background-color: var(--color-bg);
}

details {
    margin: 1rem 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
}

summary {
    padding: 1rem 1.5rem;
    background-color: var(--color-bg);
    cursor: pointer;
    font-weight: bold;
    color: var(--color-secondary);
    transition: background-color 0.2s ease;
    outline: none;
}

@media (prefers-reduced-motion: reduce) {
    summary {
        transition: none;
    }
}

summary:hover,
summary:focus-visible {
    background-color: var(--color-primary);
    color: var(--color-surface);
    outline: 2px solid var(--color-primary);
    outline-offset: -2px;
}

summary::marker {
    content: "";
}

summary::before {
    content: "▶";
    margin-right: 0.5rem;
    transition: transform 0.2s ease;
}

@media (prefers-reduced-motion: reduce) {
    summary::before {
        transition: none;
    }
}

details[open] summary::before {
    transform: rotate(90deg);
}

.faq-content {
    padding: 1.5rem;
    background-color: var(--color-surface);
    animation: fadeIn 0.3s ease;
}

@media (prefers-reduced-motion: reduce) {
    .faq-content {
        animation: none;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (prefers-reduced-motion: reduce) {
    @keyframes fadeIn {
        from { opacity: 0; }
        to { opacity: 1; }
    }
}

blockquote {
    margin: 1.5rem 0;
    padding: 1rem 1.5rem;
    border-left: 4px solid var(--color-accent);
    background-color: var(--color-bg);
    border-radius: 0 var(--radius) var(--radius) 0;
    font-style: italic;
    color: var(--color-muted);
}

ul, ol {
    padding-left: 1.5rem;
    margin: 1rem 0;
}

li {
    margin: 0.5rem 0;
}

aside ul {
    list-style: none;
    padding: 0;
}

aside li {
    margin: 0.75rem 0;
}

aside a {
    display: block;
    padding: 0.5rem 1rem;
    border-radius: calc(var(--radius) / 2);
    text-decoration: none;
    transition: all 0.2s ease;
}

@media (prefers-reduced-motion: reduce) {
    aside a {
        transition: none;
    }
}

aside a:hover,
aside a:focus-visible {
    background-color: var(--color-primary);
    color: var(--color-surface);
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

section {
    margin: 2rem 0;
}

section:first-child {
    margin-top: 0;
}

section:last-child {
    margin-bottom: 0;
}

@media (min-width: 768px) {
    section {
        margin: 2.5rem 0;
    }
}

@media (min-width: 1024px) {
    section {
        margin: 3rem 0;
    }
}

:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}