:root {
    --bg: #0f1117;
    --surface: #1a1d27;
    --border: #2a2d3a;
    --text: #e1e4ed;
    --text-muted: #8b8fa3;
    --primary: #6366f1;
    --primary-hover: #818cf8;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-hover); }

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 2rem;
}

/* Navbar */
.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}
.navbar-brand a {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text);
}
.navbar-links { display: flex; gap: 1.5rem; }
.navbar-links a { color: var(--text-muted); font-size: 0.9rem; }
.navbar-links a:hover { color: var(--text); }

/* Page header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}
.page-header h1 { font-size: 1.5rem; }

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    cursor: pointer;
    transition: background 0.15s;
}
.btn:hover { background: var(--border); color: var(--text); }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); color: #fff; }
.btn-secondary { background: var(--surface); }
.btn-danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn-danger:hover { background: #dc2626; color: #fff; }
.btn-sm { padding: 0.25rem 0.6rem; font-size: 0.8rem; }
.btn-full { width: 100%; }

/* Stats grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}
.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem;
    text-align: center;
}
.stat-number { font-size: 2rem; font-weight: 700; }
.stat-label { color: var(--text-muted); font-size: 0.85rem; margin-top: 0.25rem; }
.stat-todo .stat-number { color: var(--info); }
.stat-progress .stat-number { color: var(--warning); }
.stat-done .stat-number { color: var(--success); }
.stat-high .stat-number { color: var(--danger); }

.quick-links { display: flex; gap: 0.75rem; }

/* Filters */
.filters {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    color: var(--text-muted);
}
.filter-btn {
    padding: 0.3rem 0.75rem;
    border-radius: 4px;
    font-size: 0.85rem;
    color: var(--text-muted);
}
.filter-btn:hover { color: var(--text); background: var(--surface); }
.filter-btn.active { background: var(--primary); color: #fff; }

/* Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--surface);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border);
}
.data-table th {
    text-align: left;
    padding: 0.75rem 1rem;
    background: var(--border);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}
.data-table td {
    padding: 0.75rem 1rem;
    border-top: 1px solid var(--border);
    font-size: 0.9rem;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}
.badge-todo { background: #1e3a5f; color: var(--info); }
.badge-in_progress { background: #3b2f0a; color: var(--warning); }
.badge-done { background: #0a3b1e; color: var(--success); }
.badge-high { background: #3b0a0a; color: var(--danger); }
.badge-medium { background: #3b2f0a; color: var(--warning); }
.badge-low { background: #1e3a5f; color: var(--info); }

/* Detail card */
.detail-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}
.detail-row {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
}
.detail-row:last-child { border-bottom: none; }
.detail-row strong { display: inline-block; min-width: 120px; color: var(--text-muted); }

/* Forms */
.form-group { margin-bottom: 1rem; }
.form-group label, form label {
    display: block;
    margin-bottom: 0.35rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}
form input[type="text"],
form input[type="email"],
form input[type="password"],
form textarea,
form select {
    width: 100%;
    padding: 0.6rem 0.8rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg);
    color: var(--text);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}
form input:focus, form textarea:focus, form select:focus {
    outline: none;
    border-color: var(--primary);
}
form textarea { min-height: 80px; resize: vertical; }
form button[type="submit"] { margin-top: 0.5rem; }

/* Flash messages */
.flash {
    padding: 0.75rem 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}
.flash-success { background: #0a3b1e; color: var(--success); border: 1px solid #166534; }
.flash-danger, .flash-error { background: #3b0a0a; color: var(--danger); border: 1px solid #991b1b; }

/* Login */
.login-container {
    max-width: 380px;
    margin: 8rem auto;
    text-align: center;
}
.login-container h1 { font-size: 2rem; margin-bottom: 0.25rem; }
.login-subtitle { color: var(--text-muted); margin-bottom: 2rem; }

/* Delete form */
.delete-form { margin-top: 1rem; }

/* Empty state */
.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
}

/* Chat */
.chat-container {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 80px);
    max-width: 800px;
    margin: 0 auto;
}
.chat-header {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}
.chat-header h2 { font-size: 1.25rem; margin: 0; }
.chat-subtitle { color: var(--text-muted); font-size: 0.85rem; }

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem 0;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.chat-msg { display: flex; flex-direction: column; max-width: 75%; }
.chat-msg-user { align-self: flex-end; align-items: flex-end; }
.chat-msg-assistant { align-self: flex-start; align-items: flex-start; }

.chat-bubble {
    padding: 0.65rem 1rem;
    border-radius: 16px;
    font-size: 0.9rem;
    line-height: 1.5;
    word-wrap: break-word;
    white-space: pre-wrap;
}
.chat-msg-user .chat-bubble {
    background: var(--primary);
    color: #fff;
    border-bottom-right-radius: 4px;
}
.chat-msg-assistant .chat-bubble {
    background: var(--surface);
    border: 1px solid var(--border);
    border-bottom-left-radius: 4px;
}
.chat-time {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 0.2rem;
    padding: 0 0.5rem;
}

/* Chat input */
.chat-input-form {
    display: flex;
    gap: 0.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}
.chat-input-form input[type="text"] {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: 24px;
    background: var(--surface);
    color: var(--text);
    font-size: 0.9rem;
    margin: 0;
}
.chat-input-form input:focus {
    outline: none;
    border-color: var(--primary);
}
.chat-input-form button {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: none;
    background: var(--primary);
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background 0.15s;
}
.chat-input-form button:hover { background: var(--primary-hover); }
.chat-input-form button:disabled { opacity: 0.5; cursor: not-allowed; }

/* Typing indicator */
.chat-typing .chat-bubble {
    display: flex;
    gap: 4px;
    padding: 0.75rem 1.25rem;
}
.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-muted);
    animation: typing 1.4s infinite;
}
.dot:nth-child(2) { animation-delay: 0.2s; }
.dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes typing {
    0%, 60%, 100% { opacity: 0.3; transform: translateY(0); }
    30% { opacity: 1; transform: translateY(-4px); }
}

/* Chat suggestions */
.chat-empty {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
}
.chat-empty p { margin-bottom: 1.25rem; }
.chat-suggestions {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: center;
}
.suggestion {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: border-color 0.15s;
}
.suggestion:hover { border-color: var(--primary); }

/* Scrollbar */
.chat-messages::-webkit-scrollbar { width: 6px; }
.chat-messages::-webkit-scrollbar-track { background: transparent; }
.chat-messages::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
.chat-messages::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }