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

:root {
    --bg: #0f0f13;
    --bg-2: #16161d;
    --bg-3: #1e1e28;
    --bg-4: #2a2a38;
    --border: #2a2a38;
    --text: #e4e4ec;
    --text-2: #9898a8;
    --primary: #6366f1;
    --primary-hover: #5558e6;
    --danger: #ef4444;
    --success: #22c55e;
    --warning: #f59e0b;
    --radius: 10px;
    --radius-sm: 6px;
    --sidebar-w: 280px;
    --header-h: 56px;
}

html, body { height: 100%; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* ---------- BUTTONS ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    text-decoration: none;
    color: var(--text);
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-ghost { background: transparent; border: 1px solid var(--border); }
.btn-ghost:hover { background: var(--bg-3); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { opacity: 0.9; }
.btn-full { width: 100%; justify-content: center; }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-icon {
    background: none;
    border: none;
    color: var(--text-2);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    display: flex;
    align-items: center;
}
.btn-icon:hover { color: var(--text); background: var(--bg-3); }

/* ---------- FORMS ---------- */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; color: var(--text-2); margin-bottom: 6px; font-weight: 500; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.15s;
}
.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
}
.form-row { display: flex; gap: 16px; margin-bottom: 16px; }
.form-actions { display: flex; align-items: center; gap: 12px; justify-content: flex-end; }
.form-error { color: var(--danger); font-size: 13px; margin-bottom: 12px; }
.checkbox-label { display: flex; align-items: center; gap: 8px; font-size: 14px; cursor: pointer; }
.checkbox-label input[type="checkbox"] { accent-color: var(--primary); width: 16px; height: 16px; }

/* ---------- LOGIN PAGE ---------- */
.login-page {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: radial-gradient(ellipse at top, #1a1a2e 0%, var(--bg) 70%);
}
.login-card {
    width: 100%;
    max-width: 400px;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 40px 32px;
}
.login-logo { text-align: center; margin-bottom: 32px; }
.login-logo svg { margin-bottom: 16px; }
.login-logo h1 { font-size: 22px; font-weight: 700; margin-bottom: 6px; }
.login-logo p { color: var(--text-2); font-size: 14px; }
.flash-messages { margin-bottom: 16px; }
.flash { padding: 10px 14px; border-radius: var(--radius-sm); font-size: 13px; }
.flash-error { background: rgba(239,68,68,0.1); color: var(--danger); border: 1px solid rgba(239,68,68,0.2); }

/* ---------- APP LAYOUT ---------- */
.app-layout { display: flex; height: 100vh; overflow: hidden; }

/* Sidebar */
.sidebar {
    width: var(--sidebar-w);
    background: var(--bg-2);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: transform 0.2s;
}
.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    border-bottom: 1px solid var(--border);
}
.sidebar-close { display: none; }
.logo-row { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); }
.logo-text { font-weight: 600; font-size: 16px; }
.sidebar > .btn { margin: 12px 12px 8px; flex-shrink: 0; }

.conv-list {
    flex: 1;
    overflow-y: auto;
    padding: 4px 8px;
}
.conv-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.1s;
    margin-bottom: 2px;
}
.conv-item:hover, .conv-item.active { background: var(--bg-3); }
.conv-title {
    font-size: 13px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
}
.conv-delete { opacity: 0; flex-shrink: 0; }
.conv-item:hover .conv-delete { opacity: 1; }

.sidebar-footer { padding: 12px; border-top: 1px solid var(--border); margin-top: auto; }
.sidebar-footer .btn { margin-bottom: 8px; }
.user-info { display: flex; align-items: center; justify-content: space-between; font-size: 13px; color: var(--text-2); }

/* Main Content */
.main-content { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.main-header {
    height: var(--header-h);
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 20px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}
.main-header h2 { font-size: 15px; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
#sidebarToggle { display: none; }

.messages-area {
    flex: 1;
    overflow-y: auto;
    padding: 24px 20px;
    scroll-behavior: smooth;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    color: var(--text-2);
}
.empty-state h3 { margin: 16px 0 8px; color: var(--text); font-size: 18px; }
.empty-state p { max-width: 400px; font-size: 14px; }

/* Messages */
.message { margin-bottom: 20px; max-width: 720px; }
.message.user { margin-left: auto; }
.message-header { font-size: 12px; color: var(--text-2); margin-bottom: 4px; font-weight: 500; }
.message.user .message-header { text-align: right; }
.message-body {
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 14px;
    line-height: 1.6;
    white-space: pre-wrap;
    word-break: break-word;
}
.message.user .message-body { background: var(--primary); color: #fff; border-bottom-right-radius: 2px; }
.message.assistant .message-body { background: var(--bg-3); border-bottom-left-radius: 2px; }
.message-body.pdf-msg { display: flex; align-items: center; gap: 8px; }
.message-body.pdf-msg svg { flex-shrink: 0; }

.video-card {
    margin-top: 8px;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}
.video-card video { width: 100%; display: block; }
.video-status {
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    color: var(--text-2);
}
.spinner {
    width: 18px; height: 18px;
    border: 2px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.status-succeeded { color: var(--success); }
.status-failed { color: var(--danger); }
.status-running, .status-pending { color: var(--warning); }

/* Input Area */
.input-area {
    padding: 12px 20px 20px;
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}
.input-row { display: flex; align-items: flex-end; gap: 8px; }
.input-options { display: flex; gap: 4px; padding-bottom: 4px; }
.input-main { flex: 1; }
.upload-btn { cursor: pointer; }
.pdf-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    background: rgba(99,102,241,0.15);
    border-radius: 20px;
    font-size: 12px;
    color: var(--primary);
    margin-bottom: 6px;
}
#messageInput {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-3);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-size: 14px;
    font-family: inherit;
    resize: none;
    max-height: 150px;
    line-height: 1.5;
}
#messageInput:focus { outline: none; border-color: var(--primary); }
.send-btn { padding: 10px 14px; }
.input-settings {
    display: flex;
    gap: 16px;
    margin-top: 8px;
    font-size: 12px;
    color: var(--text-2);
}
.input-settings label { display: flex; align-items: center; gap: 6px; }
.input-settings select {
    background: var(--bg-3);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-family: inherit;
}

/* ---------- ADMIN LAYOUT ---------- */
.admin-layout { display: flex; min-height: 100vh; }
.admin-nav {
    width: 220px;
    background: var(--bg-2);
    border-right: 1px solid var(--border);
    padding: 20px 0;
    flex-shrink: 0;
}
.admin-nav-header { padding: 0 16px 20px; border-bottom: 1px solid var(--border); }
.admin-nav-links { padding: 12px 8px; display: flex; flex-direction: column; gap: 2px; }
.admin-nav-links a {
    display: block;
    padding: 10px 16px;
    color: var(--text-2);
    text-decoration: none;
    font-size: 14px;
    border-radius: var(--radius-sm);
    transition: all 0.1s;
}
.admin-nav-links a:hover { color: var(--text); background: var(--bg-3); }
.admin-nav-links a.active { color: var(--text); background: var(--bg-3); font-weight: 500; }
.admin-main { flex: 1; padding: 32px; max-width: 960px; }
.admin-main h1 { font-size: 24px; margin-bottom: 24px; }
.admin-main h2 { font-size: 18px; margin: 24px 0 12px; }

.page-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; }
.page-header h1 { margin-bottom: 0; }

/* Stats */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; }
.stat-card {
    background: var(--bg-3);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
}
.stat-value { font-size: 28px; font-weight: 700; }
.stat-label { font-size: 13px; color: var(--text-2); margin-top: 4px; }
.stat-ok .stat-value { color: var(--success); }
.stat-warn .stat-value { color: var(--warning); font-size: 20px; }

/* Tables */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 14px; font-size: 13px; border-bottom: 1px solid var(--border); }
th { color: var(--text-2); font-weight: 500; }
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 500;
    background: var(--bg-4);
}
.badge-admin { background: rgba(99,102,241,0.15); color: var(--primary); }
.badge-active { background: rgba(34,197,94,0.15); color: var(--success); }
.badge-inactive { background: rgba(239,68,68,0.15); color: var(--danger); }

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 20px;
}
.modal {
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
    width: 100%;
    max-width: 440px;
}
.modal-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.modal-header h3 { font-size: 18px; }

/* Settings */
.settings-card {
    background: var(--bg-3);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
}
.settings-card h3 { font-size: 16px; margin-bottom: 8px; }
.text-muted { color: var(--text-2); font-size: 13px; margin-bottom: 12px; }
.save-status { font-size: 13px; }
.save-ok { color: var(--success); }
.save-err { color: var(--danger); }
.test-result { margin-top: 12px; padding: 10px 14px; border-radius: var(--radius-sm); font-size: 13px; background: var(--bg-2); }
.test-ok { color: var(--success); }
.test-err { color: var(--danger); }

/* ---------- RESPONSIVE ---------- */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0; top: 0; bottom: 0;
        z-index: 50;
        transform: translateX(-100%);
    }
    .sidebar.open { transform: translateX(0); }
    .sidebar-close { display: flex; }
    #sidebarToggle { display: flex; }

    .admin-layout { flex-direction: column; }
    .admin-nav { width: 100%; border-right: none; border-bottom: 1px solid var(--border); padding: 12px 0; }
    .admin-nav-links { flex-direction: row; overflow-x: auto; padding: 8px; gap: 4px; }
    .admin-main { padding: 20px 16px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .input-settings { flex-wrap: wrap; }
}