:root {
    --md-sys-color-primary: #5ba339; /* Terraria Grass Green */
    --md-sys-color-on-primary: #ffffff;
    --md-sys-color-surface: #f7f3ed;
    --md-sys-color-on-surface: #3a2e26;
    --md-sys-color-surface-variant: #ede4d8;
    --md-sys-color-outline: #8c7a6b;
    --md-sys-color-inverse-surface: #3a2e26;
    --md-sys-color-inverse-on-surface: #f7f3ed;
    --radius-s: 4px;
    --radius-m: 8px;
    --ter-border: 2px solid #5a4a3a;
    --ter-panel: #d1c4b2;
    --ter-panel-shadow: #8c7a6b;
    --ter-panel-light: #fefcf9;
    --elev-1: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    --elev-2: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
}

[data-theme="dark"] {
    --md-sys-color-primary: #76c74d;
    --md-sys-color-on-primary: #1a1c18;
    --md-sys-color-surface: #1d1b16;
    --md-sys-color-on-surface: #e8e2d9;
    --md-sys-color-surface-variant: #4b4639;
    --md-sys-color-outline: #969080;
    --md-sys-color-inverse-surface: #e8e2d9;
    --md-sys-color-inverse-on-surface: #34302a;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Roboto", "Noto Sans JP", system-ui, -apple-system, sans-serif;
    background: var(--md-sys-color-surface);
    color: var(--md-sys-color-on-surface);
    line-height: 1.6;
}

/* App Bar */
.app-bar {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 16px;
    background: var(--md-sys-color-surface);
    border-bottom: 1px solid var(--md-sys-color-surface-variant);
    box-shadow: var(--elev-1);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
}

.brand-icon {
    color: var(--md-sys-color-primary);
}

.spacer {
    flex: 1;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--md-sys-color-on-surface);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: inline-grid;
    place-items: center;
    text-decoration: none;
}

.icon-btn:hover {
    background: color-mix(in oklab, var(--md-sys-color-primary) 12%, transparent);
}

/* Navigation Drawer */
.nav-drawer {
    position: fixed;
    top: 56px;
    left: 0;
    bottom: 0;
    width: 280px;
    background: var(--md-sys-color-surface);
    border-right: 1px solid var(--md-sys-color-surface-variant);
    transform: translateX(0);
    transition: transform .2s ease;
    z-index: 9;
}

.nav-drawer .drawer-header {
    padding: 16px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--md-sys-color-outline);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.drawer-nav {
    display: flex;
    flex-direction: column;
    padding: 8px;
    gap: 4px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius-m);
    border: none;
    cursor: pointer;
    background: transparent;
    color: inherit;
    text-align: left;
    font: inherit;
    transition: background-color 0.2s;
}

.nav-item:hover {
    background: var(--md-sys-color-surface-variant);
}

.nav-item.active {
    background: color-mix(in oklab, var(--md-sys-color-primary) 15%, transparent);
    color: var(--md-sys-color-primary);
    font-weight: 600;
}

/* Layout */
.content {
    margin-left: 280px;
    padding: 24px;
    max-width: 1000px;
}

.page-container {
    max-width: 1000px;
    margin: 0 auto;
}

@media (max-width: 920px) {
    .nav-drawer {
        transform: translateX(-100%);
    }

    .nav-drawer.open {
        transform: translateX(0);
        box-shadow: var(--elev-2);
    }

    .content {
        margin-left: 0;
    }
}

/* Breadcrumbs */
.breadcrumbs {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    font-size: 0.9rem;
    color: var(--md-sys-color-outline);
}

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

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

.breadcrumbs .sep {
    opacity: 0.5;
}

/* Hero Section */
.hero {
    padding: 32px 24px;
    background: var(--md-sys-color-surface-variant);
    border-radius: var(--radius-m);
    margin-bottom: 32px;
}

.hero h1 {
    margin: 0 0 8px;
    font-size: 2rem;
    display: flex;
    align-items: center;
    gap: 12px;
}

.hero p {
    margin: 0;
    opacity: 0.8;
    font-size: 1.1rem;
}

/* Cards */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.kb-card {
    background: var(--md-sys-color-surface);
    border: 1px solid var(--md-sys-color-surface-variant);
    padding: 24px;
    border-radius: var(--radius-m);
    display: flex;
    flex-direction: column;
    gap: 12px;
    transition: transform 0.2s, box-shadow 0.2s;
    text-decoration: none;
    color: inherit;
}

.kb-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--elev-2);
}

.kb-card header {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--md-sys-color-primary);
}

.kb-card h3 {
    margin: 0;
    font-size: 1.25rem;
}

.kb-card p {
    margin: 0;
    font-size: 0.95rem;
    opacity: 0.8;
}

.kb-card footer {
    margin-top: auto;
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    background: var(--md-sys-color-surface-variant);
    border-radius: 16px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* Tables */
.section {
    margin-bottom: 40px;
}

.section h2 {
    border-bottom: 2px solid var(--md-sys-color-primary);
    padding-bottom: 8px;
    margin-bottom: 16px;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--md-sys-color-surface);
    border: 1px solid var(--md-sys-color-surface-variant);
    border-radius: var(--radius-m);
    overflow: hidden;
}

th, td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--md-sys-color-surface-variant);
}

th {
    background: var(--md-sys-color-surface-variant);
    font-weight: 600;
    color: var(--md-sys-color-on-surface);
}

tr:last-child td {
    border-bottom: none;
}

code {
    background: var(--md-sys-color-surface-variant);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.9em;
}

@media (max-width: 600px) {
    table, thead, tbody, th, td, tr {
        display: block;
    }
    thead tr {
        position: absolute;
        top: -9999px;
        left: -9999px;
    }
    tr {
        border-bottom: 2px solid var(--md-sys-color-surface-variant);
        padding: 8px 0;
    }
    td {
        border: none;
        position: relative;
        padding-left: 40%;
        min-height: 2em;
    }
    td::before {
        position: absolute;
        top: 12px;
        left: 16px;
        width: 35%;
        font-weight: 600;
        content: attr(data-label);
        color: var(--md-sys-color-outline);
    }
}

/* Footer */
.app-footer {
    margin-top: 48px;
    padding: 24px;
    border-top: 1px solid var(--md-sys-color-surface-variant);
    font-size: 0.9rem;
    color: var(--md-sys-color-outline);
}

.app-footer .container {
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
}

/* Utilities */
.elevation-1 { box-shadow: var(--elev-1); }
.elevation-2 { box-shadow: var(--elev-2); }

[hidden] { display: none !important; }