:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-card: #1c2128;
    --bg-hover: #272c35;
    --border: #30363d;
    --border-light: #3d444d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #656d76;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --accent-soft: rgba(99, 102, 241, 0.15);
    --success: #3fb950;
    --warning: #d29922;
    --danger: #f85149;
    --info: #58a6ff;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-light); }

/* Layout */
.app-layout { display: flex; min-height: 100vh; }
.app-main { flex: 1; display: flex; flex-direction: column; margin-left: 260px; }
.app-content { flex: 1; padding: 24px 32px; }

/* Sidebar */
.sidebar {
    position: fixed; top: 0; left: 0; bottom: 0;
    width: 260px; background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex; flex-direction: column;
    z-index: 30; transition: transform 0.2s;
}
.sidebar-brand {
    display: flex; align-items: center; gap: 10px;
    padding: 16px 20px; border-bottom: 1px solid var(--border);
    text-decoration: none; color: var(--text-primary);
}
.sidebar-brand-icon {
    width: 32px; height: 32px; border-radius: 8px;
    background: var(--accent); display: flex; align-items: center;
    justify-content: center; color: #fff; font-weight: 700; font-size: 14px;
}
.sidebar-brand span { font-size: 16px; font-weight: 700; }

.sidebar-nav { flex: 1; padding: 12px; overflow-y: auto; }
.sidebar-nav a {
    display: flex; align-items: center; gap: 10px;
    padding: 10px 12px; border-radius: 8px; font-size: 14px;
    font-weight: 500; color: var(--text-secondary);
    text-decoration: none; transition: all 0.15s; position: relative;
}
.sidebar-nav a:hover { background: var(--bg-hover); color: var(--text-primary); }
.sidebar-nav a.active { background: var(--accent-soft); color: var(--accent-hover); }
.sidebar-nav a svg { width: 20px; height: 20px; flex-shrink: 0; }
.sidebar-divider { height: 1px; background: var(--border); margin: 12px 0; }

.sidebar-footer {
    padding: 12px; border-top: 1px solid var(--border);
}
.sidebar-balance {
    background: var(--bg-tertiary); border-radius: 8px; padding: 12px;
}
.sidebar-balance-label { font-size: 11px; font-weight: 500; color: var(--text-muted); }
.sidebar-balance-value { font-size: 18px; font-weight: 700; color: var(--text-primary); margin-top: 2px; }

/* Top Header */
.top-header {
    position: sticky; top: 0; z-index: 10;
    display: flex; align-items: center; justify-content: space-between;
    height: 56px; padding: 0 32px;
    background: var(--bg-secondary); border-bottom: 1px solid var(--border);
}
.top-header-left { display: flex; align-items: center; gap: 8px; }
.top-header-right { display: flex; align-items: center; gap: 12px; }
.top-header-user { font-size: 14px; color: var(--text-secondary); }

/* Cards */
.card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: 12px; overflow: hidden;
}
.card-body { padding: 20px; }
.card-header {
    padding: 16px 20px; border-bottom: 1px solid var(--border);
    display: flex; align-items: center; justify-content: space-between;
}

/* Stats */
.stat-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: 12px; padding: 20px;
}
.stat-label { font-size: 13px; font-weight: 500; color: var(--text-secondary); }
.stat-value { font-size: 24px; font-weight: 700; color: var(--text-primary); margin-top: 4px; }

/* Buttons */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    padding: 8px 16px; border-radius: 8px; font-size: 14px; font-weight: 600;
    border: none; cursor: pointer; transition: all 0.15s; text-decoration: none;
    line-height: 1.5;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: #fff; }
.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 { background: var(--bg-hover); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { opacity: 0.9; }
.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-icon { padding: 8px; }

/* Forms */
.form-group { margin-bottom: 16px; }
.form-label {
    display: block; margin-bottom: 6px; font-size: 13px;
    font-weight: 500; color: var(--text-secondary);
}
.form-input, .form-select, .form-textarea {
    width: 100%; padding: 10px 14px; border-radius: 8px;
    background: var(--bg-tertiary); border: 1px solid var(--border);
    color: var(--text-primary); font-size: 14px; font-family: inherit;
    transition: border-color 0.15s;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
    outline: none; border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}
.form-input::placeholder, .form-textarea::placeholder { color: var(--text-muted); }
.form-textarea { resize: vertical; min-height: 80px; }
.form-error { font-size: 12px; color: var(--danger); margin-top: 4px; display: none; }
.form-hint { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

.form-check {
    display: flex; align-items: center; gap: 8px;
}
.form-check input[type="checkbox"] {
    width: 18px; height: 18px; border-radius: 4px;
    border: 1px solid var(--border); background: var(--bg-tertiary);
    accent-color: var(--accent);
}

/* Tables */
.table-wrapper {
    overflow-x: auto; border-radius: 12px;
    background: var(--bg-card); border: 1px solid var(--border);
}
table { width: 100%; border-collapse: collapse; }
thead { background: var(--bg-tertiary); }
th {
    padding: 12px 16px; text-align: left; font-size: 11px;
    font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em;
    color: var(--text-muted);
}
td { padding: 12px 16px; font-size: 14px; border-top: 1px solid var(--border); }
tbody tr { transition: background 0.1s; }
tbody tr:hover { background: var(--bg-hover); }

/* Badges */
.badge {
    display: inline-flex; align-items: center; gap: 4px;
    padding: 3px 10px; border-radius: 20px; font-size: 11px;
    font-weight: 600;
}
.badge-success { background: rgba(63, 185, 80, 0.15); color: var(--success); }
.badge-warning { background: rgba(210, 153, 34, 0.15); color: var(--warning); }
.badge-danger { background: rgba(248, 81, 73, 0.15); color: var(--danger); }
.badge-info { background: rgba(88, 166, 255, 0.15); color: var(--info); }

/* Toast */
.toast-container { position: fixed; top: 16px; right: 16px; z-index: 9999; display: flex; flex-direction: column; gap: 8px; }
.toast {
    padding: 12px 20px; border-radius: 8px; font-size: 14px; font-weight: 500;
    animation: slideIn 0.3s ease; min-width: 250px;
    border: 1px solid var(--border);
}
.toast-success { background: rgba(63,185,80,0.15); color: var(--success); border-color: rgba(63,185,80,0.3); }
.toast-error { background: rgba(248,81,73,0.15); color: var(--danger); border-color: rgba(248,81,73,0.3); }

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* Page Header */
.page-header {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 24px;
}
.page-title { font-size: 24px; font-weight: 700; }
.page-subtitle { font-size: 14px; color: var(--text-secondary); margin-top: 2px; }

/* Grid */
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Tabs */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 20px; }
.tab-btn {
    padding: 10px 16px; font-size: 14px; font-weight: 500;
    color: var(--text-secondary); background: none; border: none;
    border-bottom: 2px solid transparent; cursor: pointer; transition: all 0.15s;
}
.tab-btn:hover { color: var(--text-primary); }
.tab-btn.active { color: var(--accent-hover); border-bottom-color: var(--accent); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* Toggle */
.toggle {
    position: relative; width: 44px; height: 24px;
    background: var(--bg-tertiary); border-radius: 12px;
    cursor: pointer; transition: background 0.2s; border: 1px solid var(--border);
}
.toggle.on { background: var(--accent); border-color: var(--accent); }
.toggle::after {
    content: ''; position: absolute; top: 2px; left: 2px;
    width: 18px; height: 18px; border-radius: 50%;
    background: #fff; transition: transform 0.2s;
}
.toggle.on::after { transform: translateX(20px); }

/* Auth pages */
.auth-wrapper {
    display: flex; align-items: center; justify-content: center;
    min-height: 100vh; padding: 16px;
}
.auth-card {
    width: 100%; max-width: 420px;
}
.auth-card .card-body { padding: 32px; }
.auth-brand {
    display: flex; align-items: center; justify-content: center;
    gap: 10px; margin-bottom: 32px; text-decoration: none; color: var(--text-primary);
}
.auth-title { font-size: 22px; font-weight: 700; text-align: center; margin-bottom: 24px; }

/* Chat */
.chat-messages {
    flex: 1; overflow-y: auto; padding: 16px;
    display: flex; flex-direction: column; gap: 8px;
}
.chat-bubble {
    max-width: 80%; padding: 10px 14px; border-radius: 12px;
    font-size: 14px; line-height: 1.5; word-wrap: break-word;
    white-space: pre-wrap;
}
.chat-bubble-user {
    background: var(--accent); color: #fff;
    border-bottom-right-radius: 4px; align-self: flex-end;
}
.chat-bubble-assistant {
    background: var(--bg-tertiary); color: var(--text-primary);
    border-bottom-left-radius: 4px; align-self: flex-start;
}
.chat-input-area {
    display: flex; align-items: center; gap: 8px;
    padding: 12px 16px; border-top: 1px solid var(--border);
}
.chat-input {
    flex: 1; padding: 10px 14px; border-radius: 20px;
    background: var(--bg-tertiary); border: 1px solid var(--border);
    color: var(--text-primary); font-size: 14px; font-family: inherit;
    outline: none;
}
.chat-input:focus { border-color: var(--accent); }
.chat-send-btn {
    width: 36px; height: 36px; border-radius: 50%; border: none;
    background: var(--accent); color: #fff; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: background 0.15s;
}
.chat-send-btn:hover { background: var(--accent-hover); }

/* Agent card */
.agent-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: 12px; padding: 20px; transition: all 0.15s;
    text-decoration: none; display: block; color: inherit;
}
.agent-card:hover { border-color: var(--accent); background: var(--bg-hover); }

/* Typing indicator */
.typing-dots { display: flex; align-items: center; gap: 4px; padding: 8px 0; }
.typing-dots span {
    width: 6px; height: 6px; border-radius: 50%;
    background: var(--text-muted); animation: typing 1.2s infinite ease-in-out;
}
.typing-dots span:nth-child(2) { animation-delay: 0.15s; }
.typing-dots span:nth-child(3) { animation-delay: 0.3s; }
@keyframes typing {
    0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
    40% { transform: scale(1); opacity: 1; }
}

/* Empty state */
.empty-state {
    text-align: center; padding: 48px 16px; color: var(--text-muted);
}
.empty-state svg { width: 48px; height: 48px; margin: 0 auto 12px; opacity: 0.4; }
.empty-state p { font-size: 14px; }

/* Mobile overlay */
.sidebar-overlay {
    display: none; position: fixed; inset: 0; z-index: 20;
    background: rgba(0,0,0,0.6);
}

/* Burger */
.burger { display: none; background: none; border: none; color: var(--text-secondary); cursor: pointer; padding: 8px; border-radius: 8px; }
.burger:hover { background: var(--bg-hover); }
.burger svg { width: 20px; height: 20px; }

/* Responsive */
@media (max-width: 1024px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .sidebar-overlay.open { display: block; }
    .app-main { margin-left: 0; }
    .app-content { padding: 16px; }
    .top-header { padding: 0 16px; }
    .burger { display: block; }
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
    .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
    .page-header { flex-direction: column; align-items: flex-start; gap: 12px; }
}