:root {
    --bg: #0f0f12;
    --surface: #18181c;
    --border: #2a2a30;
    --text: #e4e4e7;
    --text-muted: #a1a1aa;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --success: #22c55e;
    --warning: #eab308;
    --error: #ef4444;
    --radius: 8px;
}

* {
    box-sizing: border-box;
}

body {
    font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    margin: 0;
    min-height: 100vh;
    line-height: 1.5;
}

.header {
    padding: 2rem 1.5rem;
    border-bottom: 1px solid var(--border);
    text-align: center;
}

.header h1 {
    margin: 0;
    font-size: 1.75rem;
    font-weight: 700;
}

.subtitle {
    margin: 0.5rem 0 0;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.nav {
    margin-top: 1rem;
    display: flex;
    gap: 0.5rem;
    justify-content: center;
}

.nav-link {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.95rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    display: inline-block;
}

.nav-link:hover {
    color: var(--accent-hover);
    background: rgba(99, 102, 241, 0.15);
}

.nav-link.active {
    background: var(--accent);
    color: #fff;
}

.nav-link.active:hover {
    background: var(--accent-hover);
    color: #fff;
}

.main {
    max-width: 720px;
    margin: 0 auto;
    padding: 1.5rem;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.card h2 {
    margin: 0 0 1rem;
    font-size: 1.25rem;
    font-weight: 600;
}

/* Buttons: single source of truth */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: var(--radius);
    font-size: 0.9375rem;
    font-weight: 500;
    line-height: 1.25;
    cursor: pointer;
    text-decoration: none;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
}

.btn-secondary {
    background: var(--border);
    color: var(--text);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--text-muted);
}

.btn-small {
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
}

.btn-danger {
    background: var(--error);
    color: #fff;
}

.btn-danger:hover:not(:disabled) {
    background: #dc2626;
}

.form label {
    display: block;
    margin-bottom: 0.35rem;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.form input[type="url"],
.form input[type="text"] {
    width: 100%;
    padding: 0.625rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    color: var(--text);
    font-size: 1rem;
    margin-bottom: 0.75rem;
}

.form input:focus {
    outline: none;
    border-color: var(--accent);
}

.form button[type="submit"] {
    margin-top: 0.25rem;
}

.form-inline {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.75rem;
    align-items: center;
}

.form-inline input {
    flex: 1;
    margin-bottom: 0;
    min-width: 0;
}

.message,
.loading,
.empty,
.error {
    margin-top: 0.75rem;
    font-size: 0.9rem;
}

.message.success { color: var(--success); }
.message.error { color: var(--error); }
.error { color: var(--error); }
.empty { color: var(--text-muted); }

.hidden {
    display: none !important;
}

.section-list-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.section-list-header h2 {
    margin: 0;
}

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

.session-list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.75rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
}

.session-list li:last-child {
    border-bottom: none;
}

.session-list .session-info,
.session-list .session-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.session-list .session-info {
    flex: 1;
    min-width: 0;
}

.session-list .url {
    font-weight: 500;
    word-break: break-all;
}

.session-list .meta {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.session-list .status {
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 500;
}

.session-list .status.processing { background: var(--warning); color: #000; }
.session-list .status.completed { background: var(--success); color: #000; }
.session-list .status.failed { background: var(--error); color: #fff; }

.session-list .actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.session-list .btn-small:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.report-header,
.chat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.report-header h2,
.chat-header h2 {
    margin: 0;
}

.report-content h3 {
    font-size: 1rem;
    margin: 1rem 0 0.5rem;
    color: var(--text-muted);
}

.report-content ul {
    margin: 0;
    padding-left: 1.25rem;
}

.report-content .score {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
}

.chat-messages {
    min-height: 240px;
    max-height:  min(480px, 60vh);
    overflow-y: auto;
    padding: 1rem;
    background: var(--bg);
    border-radius: var(--radius);
    margin-bottom: 0.75rem;
}

.chat-messages .msg {
    margin-bottom: 0.75rem;
    word-wrap: break-word;
    white-space: pre-wrap;
}

.chat-messages .msg.user {
    color: var(--accent);
}

.chat-messages .msg.assistant {
    color: var(--text);
}

.chat-messages .msg.assistant.error {
    color: var(--error);
}

.msg-loading {
    color: var(--text-muted);
    font-style: italic;
}

.loading-dots::after {
    content: '';
    animation: loading-dots 1.2s steps(4, end) infinite;
}

@keyframes loading-dots {
    0% { content: ''; }
    25% { content: '.'; }
    50% { content: '..'; }
    75% { content: '...'; }
    100% { content: ''; }
}