/* Framework Explanations — reading-optimized layout */

.fw-reader-body {
    /* override the dense main-app body flex so this page breathes */
    display: block;
    min-height: 100vh;
}

.fw-reader-header {
    display: grid;
    grid-template-columns: auto 1fr 280px;
    gap: 20px;
    align-items: center;
    padding: 14px 28px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-panel);
    position: sticky;
    top: 0;
    z-index: 10;
}

.back-link {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 13px;
    padding: 6px 10px;
    border: 1px solid var(--border);
    border-radius: 4px;
    transition: color 0.15s, border-color 0.15s;
}
.back-link:hover { color: var(--accent); border-color: var(--accent); }

.header-center { min-width: 0; }
.fw-reader-header h1 {
    margin: 0;
    font-size: 18px;
    color: var(--accent);
    letter-spacing: 0.2px;
    line-height: 1.2;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.fw-reader-header .subtitle {
    color: var(--text-dim);
    font-size: 12px;
    display: block;
    margin-top: 2px;
}

.fw-search {
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 8px 12px;
    border-radius: 5px;
    font-size: 13px;
}
.fw-search:focus { outline: none; border-color: var(--accent); }

.fw-reader-main {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 24px;
    max-width: 1400px;
    margin: 0 auto;
    padding: 24px 28px 80px;
}

/* ===== TOC ===== */
.fw-reader-toc {
    position: sticky;
    top: 80px;
    align-self: start;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
    padding-right: 6px;
}

.toc-category { margin-bottom: 18px; }
.toc-cat-label {
    font: 10px/1 ui-monospace, monospace;
    text-transform: uppercase;
    letter-spacing: 1.4px;
    color: var(--text-dim);
    padding: 4px 0 8px 4px;
}
.toc-cat-framework .toc-cat-label { color: var(--accent); }
.toc-cat-pattern .toc-cat-label { color: var(--good); }
.toc-cat-trap .toc-cat-label { color: var(--danger); }

.toc-list { list-style: none; margin: 0; padding: 0; }

.toc-item {
    border-left: 3px solid transparent;
    transition: background 0.15s, border-color 0.15s;
}
.toc-item a {
    display: block;
    padding: 9px 12px;
    color: var(--text);
    text-decoration: none;
}
.toc-item:hover { background: rgba(255, 255, 255, 0.03); }
.toc-cat-framework .toc-item:hover { border-left-color: var(--accent); }
.toc-cat-pattern .toc-item:hover { border-left-color: var(--good); }
.toc-cat-trap .toc-item:hover { border-left-color: var(--danger); }

.toc-item.active { background: rgba(94, 176, 255, 0.08); border-left-color: var(--accent); }
.toc-cat-pattern .toc-item.active { background: rgba(74, 222, 128, 0.08); border-left-color: var(--good); }
.toc-cat-trap .toc-item.active { background: rgba(255, 107, 107, 0.08); border-left-color: var(--danger); }

.toc-title { display: block; font-size: 13px; font-weight: 500; color: var(--text); line-height: 1.4; }
.toc-summary { display: block; font-size: 11px; color: var(--text-dim); line-height: 1.4; margin-top: 2px; }

/* ===== Article ===== */
.fw-reader-article {
    max-width: 760px;
    min-width: 0;
}

.fw-content { font-size: 15px; line-height: 1.75; color: var(--text); }

.fw-content h1 {
    font-size: 30px;
    line-height: 1.25;
    margin: 0 0 8px 0;
    color: var(--text);
    letter-spacing: -0.3px;
}
.fw-content h2 {
    font-size: 19px;
    margin: 32px 0 10px 0;
    color: var(--accent);
    letter-spacing: 0.2px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--border);
}
.fw-content h3 {
    font-size: 16px;
    margin: 22px 0 8px 0;
    color: var(--text);
}

.fw-content p { margin: 10px 0; }
.fw-content strong { color: #fff; }
.fw-content em { color: var(--text-dim); }
.fw-content code {
    font: 13px/1 ui-monospace, "SF Mono", Menlo, monospace;
    background: rgba(255, 255, 255, 0.07);
    color: var(--accent);
    padding: 2px 6px;
    border-radius: 3px;
}
.fw-content pre {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 14px 16px;
    overflow-x: auto;
    margin: 14px 0;
}
.fw-content pre code { background: transparent; color: var(--text); padding: 0; }

.fw-content blockquote {
    margin: 14px 0;
    padding: 10px 16px;
    border-left: 3px solid var(--accent);
    background: rgba(94, 176, 255, 0.05);
    color: var(--text);
    border-radius: 0 4px 4px 0;
}
.fw-content blockquote p { margin: 0; }

.fw-content ul, .fw-content ol { padding-left: 26px; margin: 10px 0; }
.fw-content li { margin: 5px 0; }

.fw-content table {
    border-collapse: collapse;
    margin: 16px 0;
    width: 100%;
    font-size: 13px;
}
.fw-content th, .fw-content td {
    border: 1px solid var(--border);
    padding: 8px 12px;
    text-align: left;
    vertical-align: top;
}
.fw-content th {
    background: var(--bg-panel-alt);
    color: var(--accent);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    font-weight: 600;
}

.fw-content a {
    color: var(--accent);
    text-decoration: underline;
    text-decoration-color: rgba(94, 176, 255, 0.4);
    text-underline-offset: 2px;
}
.fw-content a:hover { text-decoration-color: var(--accent); }

.fw-content hr { border: 0; border-top: 1px dashed var(--border); margin: 24px 0; }

/* ===== Landing page ===== */
.fw-landing { max-width: 640px; }
.fw-landing h2 { font-size: 24px; margin: 0 0 12px 0; color: var(--text); }
.fw-landing-lead { color: var(--text); font-size: 15px; line-height: 1.7; }
.fw-landing-stats {
    display: flex;
    gap: 32px;
    margin: 24px 0;
    padding: 16px 20px;
    background: var(--bg-panel-alt);
    border: 1px solid var(--border);
    border-radius: 6px;
}
.fw-landing-stats div { font-size: 13px; color: var(--text-dim); }
.fw-landing-stats strong { font-size: 24px; color: var(--accent); margin-right: 6px; display: inline-block; }
.fw-landing-tip { font-size: 13px; color: var(--text-dim); }
.fw-landing-tip em { color: var(--text); font-style: italic; }

.fw-error {
    padding: 40px 0;
    text-align: center;
    color: var(--text-dim);
}
.fw-error h2 { color: var(--danger); margin-bottom: 8px; }

/* ===== Responsive ===== */
@media (max-width: 1000px) {
    .fw-reader-header { grid-template-columns: auto 1fr; padding: 12px 20px; }
    .fw-reader-header .fw-search { grid-column: 1 / -1; }
    .fw-reader-main { grid-template-columns: 1fr; padding: 20px; }
    .fw-reader-toc { position: static; max-height: none; }
}