/*
 * Munin Shared Style Guide
 * ========================
 * Imported by all pages: static pages, auth templates, chat frontend.
 * Update styles here — changes apply everywhere.
 *
 * Standard header HTML (each page has its own copy):
 *
 *   <header>
 *     <div class="container header-content">
 *       <a href="https://muninai.org" class="logo">
 *         <img src="/shared/munin_logo_without_script.webp" alt="Munin" class="logo-img">
 *         <span class="logo-text">Munin</span>
 *       </a>
 *       <nav>
 *         <a href="https://muninai.org">Home</a>
 *         <a href="https://search.muninai.org">Search</a>
 *         <a href="https://research.muninai.org">Research</a>
 *         <a href="https://docs.muninai.org">Docs</a>
 *         <a href="https://chat.muninai.org">Chat</a>
 *         <a href="https://upload.muninai.org">Upload</a>
 *       </nav>
 *     </div>
 *   </header>
 *
 * Standard footer HTML:
 *
 *   <footer>
 *     <div class="container">
 *       <p>Munin Research Assistant | Powered by Hugin Cluster</p>
 *       <p style="margin-top: 8px;">
 *         <a href="https://search.muninai.org">Paper Search</a> |
 *         <a href="https://research.muninai.org">Deep Research</a> |
 *         <a href="https://chat.muninai.org">Chat</a> |
 *         <a href="https://upload.muninai.org">Upload</a>
 *       </p>
 *     </div>
 *   </footer>
 */

/* ── CSS Variables ───────────────────────────────────────────────────────────── */

:root {
    --bg-primary: #0f1419;
    --bg-secondary: #1a1f26;
    --bg-tertiary: #242a33;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent: #58a6ff;
    --accent-hover: #79b8ff;
    --border: #30363d;
    --success: #3fb950;
    --warning: #d29922;
    --error: #f85149;
}

/* ── Reset & Base ────────────────────────────────────────────────────────────── */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* ── Container ───────────────────────────────────────────────────────────────── */

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ── Header ──────────────────────────────────────────────────────────────────── */

header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 10px 0;
}

header .container {
    max-width: 1200px;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-img {
    height: 28px;
    width: auto;
    filter: brightness(0) invert(1);
}

.logo-text {
    font-size: 18px;
    font-weight: 600;
}

nav {
    display: flex;
    gap: 16px;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

nav a:hover {
    color: var(--accent);
}

nav a.active {
    color: var(--accent);
}

/* ── Footer ──────────────────────────────────────────────────────────────────── */

footer {
    padding: 32px 0;
    text-align: center;
    color: var(--text-secondary);
    border-top: 1px solid var(--border);
    margin-top: 48px;
}

footer a {
    color: var(--accent);
    text-decoration: none;
}

/* ── Buttons ─────────────────────────────────────────────────────────────────── */

.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
    font-size: inherit;
}

.btn-primary {
    background: var(--accent);
    color: var(--bg-primary);
}

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--accent);
}

/* ── Form Inputs ─────────────────────────────────────────────────────────────── */

input[type="text"],
input[type="email"],
input[type="number"],
input[type="password"],
textarea,
select {
    padding: 12px 16px;
    font-size: 14px;
    font-family: inherit;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.2s;
}

input:focus,
textarea:focus,
select:focus {
    border-color: var(--accent);
}

input::placeholder,
textarea::placeholder {
    color: var(--text-secondary);
}

/* ── Cards ───────────────────────────────────────────────────────────────────── */

.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    transition: border-color 0.2s;
}

.card:hover {
    border-color: var(--accent);
}

/* ── Code Blocks ─────────────────────────────────────────────────────────────── */

code {
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 14px;
}

pre {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    overflow-x: auto;
    margin: 16px 0;
}

pre code {
    background: none;
    padding: 0;
    font-size: 13px;
    line-height: 1.5;
}

/* ── Loading Spinner ─────────────────────────────────────────────────────────── */

.loading {
    text-align: center;
    padding: 48px;
    color: var(--text-secondary);
}

.loading-spinner {
    display: inline-block;
    width: 32px;
    height: 32px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 16px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ── Error State ─────────────────────────────────────────────────────────────── */

.error {
    background: rgba(248, 81, 73, 0.1);
    border: 1px solid var(--error);
    border-radius: 8px;
    padding: 16px;
    color: var(--error);
    margin-bottom: 24px;
}

/* ── Empty State ─────────────────────────────────────────────────────────────── */

.empty-state {
    text-align: center;
    padding: 64px;
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

/* ── Tables ──────────────────────────────────────────────────────────────────── */

table {
    width: 100%;
    border-collapse: collapse;
}

th {
    text-align: left;
    color: var(--text-secondary);
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
}

td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
}

/* ── Responsive ──────────────────────────────────────────────────────────────── */

@media (max-width: 768px) {
    nav {
        display: none;
    }
}