:root {
    --primary: #0F172A;
    --primary-light: #E2E8F0;
    --accent: #0369A1;
    --accent-light: #E0F2FE;
    --bg: #F8FAFC;
    --card: #FFFFFF;
    --gray-50: #F8FAFC;
    --gray-100: #F1F5F9;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-400: #94A3B8;
    --gray-500: #64748B;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1E293B;
    --gray-900: #0F172A;
    --danger: #DC2626;
    --success: #16A34A;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
    --shadow-md: 0 4px 6px rgba(0,0,0,.05), 0 2px 4px rgba(0,0,0,.04);
}

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

html { font-size: 16px; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--gray-800);
    line-height: 1.5;
    min-height: 100dvh;
}

/* Layout */
.app-layout { display: flex; min-height: 100dvh; }
.sidebar {
    width: 260px; background: var(--primary); color: white;
    padding: 24px 0; flex-shrink: 0; position: sticky; top: 0; height: 100dvh;
    display: flex; flex-direction: column;
}
.sidebar-brand {
    padding: 0 24px 24px; border-bottom: 1px solid rgba(255,255,255,.1);
    margin-bottom: 8px;
}
.sidebar-brand h2 { font-size: 18px; font-weight: 700; letter-spacing: -.02em; }
.sidebar-brand span { font-size: 12px; opacity: .6; }
.sidebar nav { flex: 1; padding: 8px 12px; }
.sidebar a {
    display: flex; align-items: center; gap: 12px;
    padding: 10px 12px; border-radius: var(--radius-sm);
    color: rgba(255,255,255,.7); text-decoration: none;
    font-size: 14px; font-weight: 500; transition: all .15s;
}
.sidebar a:hover, .sidebar a.active { background: rgba(255,255,255,.1); color: white; }
.sidebar a .icon { width: 20px; text-align: center; font-size: 16px; }

.main-content { flex: 1; min-width: 0; }
.page-header {
    background: white; border-bottom: 1px solid var(--gray-200);
    padding: 20px 32px; display: flex; align-items: center; justify-content: space-between;
}
.page-header h1 { font-size: 22px; font-weight: 700; color: var(--gray-900); }
.page-body { padding: 24px 32px; max-width: 1200px; }

/* Cards */
.card {
    background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
    padding: 20px; transition: box-shadow .2s;
}
.card:hover { box-shadow: var(--shadow-md); }
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(360px, 1fr)); gap: 16px; }

/* Badges */
.badge {
    display: inline-block; padding: 3px 10px; border-radius: 20px;
    font-size: 12px; font-weight: 600;
}
.badge-primary { background: var(--primary-light); color: var(--primary); }
.badge-accent { background: var(--accent-light); color: var(--accent); }
.badge-success { background: #DCFCE7; color: var(--success); }
.badge-danger { background: #FEE2E2; color: var(--danger); }

/* Buttons */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 10px 20px; border-radius: var(--radius-sm); font-size: 14px;
    font-weight: 600; border: none; cursor: pointer; transition: all .15s;
    text-decoration: none;
}
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--gray-800); }
.btn-accent { background: var(--accent); color: white; }
.btn-accent:hover { opacity: .9; }
.btn-outline { background: white; border: 1px solid var(--gray-200); color: var(--gray-700); }
.btn-outline:hover { background: var(--gray-50); }
.btn-ghost { background: transparent; color: var(--gray-600); }
.btn-ghost:hover { background: var(--gray-100); }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-lg { padding: 12px 24px; font-size: 16px; }
.btn-block { width: 100%; }
.btn-danger { background: var(--danger); color: white; }

/* Forms */
.form-group { margin-bottom: 16px; }
.form-label { display: block; font-size: 13px; font-weight: 600; color: var(--gray-600); margin-bottom: 6px; }
.form-input, .form-select, .form-textarea {
    width: 100%; padding: 10px 14px; border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm); font-size: 15px; color: var(--gray-800);
    background: white; transition: border-color .15s;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
    outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(3,105,161,.1);
}
.form-input::placeholder { color: var(--gray-400); }
.form-textarea { min-height: 100px; resize: vertical; font-family: inherit; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form-error { color: var(--danger); font-size: 13px; margin-top: 4px; }
.form-hint { color: var(--gray-400); font-size: 12px; margin-top: 4px; }

/* Search */
.search-bar {
    display: flex; align-items: center; gap: 8px; background: white;
    border: 1px solid var(--gray-200); border-radius: var(--radius); padding: 4px 4px 4px 16px;
}
.search-bar input {
    flex: 1; border: none; outline: none; font-size: 15px; padding: 8px 0;
    color: var(--gray-800); background: transparent;
}
.search-bar input::placeholder { color: var(--gray-400); }

/* Filter chips */
.chips-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
.chips-scroll::-webkit-scrollbar { display: none; }
.chips { display: flex; gap: 8px; flex-wrap: nowrap; }
.chip {
    padding: 6px 16px; border-radius: 20px; font-size: 13px; font-weight: 500;
    border: 1px solid var(--gray-200); background: white; color: var(--gray-600);
    cursor: pointer; transition: all .15s; white-space: nowrap;
}
.chip:hover { border-color: var(--gray-300); background: var(--gray-50); }
.chip.active { background: var(--primary); color: white; border-color: var(--primary); }

/* Order card */
.order-card { cursor: pointer; }
.order-card .order-title { font-size: 17px; font-weight: 700; color: var(--gray-900); margin: 8px 0 4px; line-height: 1.3; overflow-wrap: anywhere; }
.order-card .order-desc { font-size: 14px; color: var(--gray-500); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; overflow-wrap: anywhere; }
.order-meta { display: flex; gap: 16px; margin-top: 12px; font-size: 13px; color: var(--gray-500); }
.order-meta .price { font-weight: 700; color: var(--primary); }

/* Bid card */
.bid-card { border: 1px solid var(--gray-100); padding: 16px; border-radius: var(--radius); }
.bid-card + .bid-card { margin-top: 8px; }
.bid-header { display: flex; justify-content: space-between; align-items: flex-start; }
.bid-price { font-size: 20px; font-weight: 700; color: var(--accent); }
.bid-contractor { font-weight: 600; color: var(--gray-800); }
.bid-meta { font-size: 13px; color: var(--gray-400); margin-top: 2px; }
.bid-message { font-size: 14px; color: var(--gray-600); margin-top: 8px; line-height: 1.5; }

/* Chat */
.chat-container { display: flex; flex-direction: column; height: calc(100dvh - 130px); }
.chat-messages { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 8px; }
.chat-bubble { max-width: 70%; padding: 10px 14px; border-radius: 16px 16px 4px 16px; font-size: 15px; line-height: 1.4; overflow-wrap: anywhere; }
.chat-sender { font-size: 12px; font-weight: 600; color: var(--accent); margin-bottom: 2px; }
.chat-bubble.own { background: var(--primary); color: white; align-self: flex-end; border-radius: 16px 16px 16px 4px; }
.chat-bubble.other { background: white; color: var(--gray-800); align-self: flex-start; border: 1px solid var(--gray-100); }
.chat-bubble .time { font-size: 11px; opacity: .6; margin-top: 4px; text-align: right; }
.chat-input {
    display: flex; gap: 8px; padding: 12px 16px; border-top: 1px solid var(--gray-200); background: white;
}
.chat-input input { flex: 1; }

/* Stats */
.stat-row { display: flex; gap: 24px; flex-wrap: wrap; }
.stat-item label { font-size: 12px; color: var(--gray-400); display: block; }
.stat-item span { font-size: 16px; font-weight: 700; color: var(--gray-800); }

/* Avatar */
.avatar {
    width: 48px; height: 48px; border-radius: 50%; background: var(--primary-light);
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; color: var(--primary); font-size: 16px; flex-shrink: 0;
}
.avatar-lg { width: 72px; height: 72px; font-size: 24px; }

/* Profile */
.profile-card { text-align: center; padding: 32px; }
.profile-card .avatar { margin: 0 auto 12px; }

/* Empty state */
.empty-state { text-align: center; padding: 60px 20px; color: var(--gray-400); }
.empty-state h3 { font-size: 18px; color: var(--gray-500); margin-bottom: 8px; }
.empty-state p { font-size: 14px; }

/* Role toggle */
.role-toggle { display: flex; border: 1px solid var(--gray-200); border-radius: var(--radius-sm); overflow: hidden; }
.role-toggle button {
    flex: 1; padding: 10px; border: none; font-size: 14px; font-weight: 500;
    cursor: pointer; transition: all .15s; background: white; color: var(--gray-600);
}
.role-toggle button.active { background: var(--primary); color: white; }

/* Detail page */
.detail-section { margin-bottom: 24px; }
.detail-section h3 { font-size: 14px; font-weight: 600; color: var(--gray-500); margin-bottom: 8px; text-transform: uppercase; letter-spacing: .05em; }
.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.detail-item label { font-size: 12px; color: var(--gray-400); }
.detail-item p { font-size: 15px; font-weight: 600; color: var(--gray-800); margin-top: 2px; }

/* Alert */
.alert { padding: 12px 16px; border-radius: var(--radius-sm); font-size: 14px; margin-bottom: 16px; }
.alert-error { background: #FEE2E2; color: var(--danger); }
.alert-success { background: #DCFCE7; color: var(--success); }

/* Detail layout */
.detail-layout { display: grid; grid-template-columns: 2fr 1fr; gap: 24px; }
.page-header h1 { overflow-wrap: anywhere; }

/* Responsive */
@media (max-width: 768px) {
    .sidebar { display: none; }
    .page-body { padding: 16px; }
    .page-header { padding: 16px; }
    .card-grid { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .detail-grid { grid-template-columns: 1fr; }
    .detail-layout { grid-template-columns: 1fr; }
    .stat-row { gap: 16px; }
    .chips-scroll { margin: 0 -16px; padding: 0 16px; }
    .chip { padding: 8px 16px; min-height: 44px; display: flex; align-items: center; }
    .search-bar input { min-height: 44px; }
    .search-bar .btn { min-height: 44px; }
}

/* Mobile bottom nav */
.mobile-nav {
    display: none; position: fixed; bottom: 0; left: 0; right: 0;
    background: white; border-top: 1px solid var(--gray-200);
    padding: 8px 0 calc(8px + env(safe-area-inset-bottom));
    z-index: 100;
}
.mobile-nav nav { display: flex; justify-content: space-around; }
.mobile-nav a {
    display: flex; flex-direction: column; align-items: center; gap: 2px;
    font-size: 11px; color: var(--gray-400); text-decoration: none; padding: 4px 12px;
}
.mobile-nav a.active { color: var(--primary); }
.mobile-nav a .icon { font-size: 20px; }

@media (max-width: 768px) {
    .mobile-nav { display: block; }
    .main-content { padding-bottom: 140px; }
}

/* Utility */
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.gap-2 { gap: 16px; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.text-sm { font-size: 13px; }
.text-muted { color: var(--gray-400); }
.font-bold { font-weight: 700; }

/* Role switcher (demo) */
.role-switcher {
    position: fixed; bottom: 0; left: 260px; right: 0;
    background: var(--gray-100); border-top: 1px solid var(--gray-200);
    padding: 8px 16px; display: flex; align-items: center; gap: 8px;
    z-index: 50; font-size: 13px;
}
@media (max-width: 768px) {
    .role-switcher { left: 0; bottom: 74px; white-space: nowrap; overflow-x: auto; }
    .role-switcher .btn-sm { font-size: 11px; padding: 4px 8px; }
}

#blazor-error-ui { display: none; }