:root {
    --navy: #1E3A5F;
    --blue: #1A56DB;
    --blue-light: #3B82F6;
    --gray: #F1F5F9;
    --text: #1E293B;
    --muted: #64748B;
    --white: #FFFFFF;
    --border: #E2E8F0;
    --success: #10B981;
    --danger: #EF4444;
}

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

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

/* NAVBAR */
.navbar {
    background: var(--navy);
    padding: 0 32px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.navbar-brand {
    font-size: 22px;
    font-weight: 700;
    color: var(--white);
    text-decoration: none;
}

.navbar-brand span { color: var(--blue-light); }

.navbar-nav {
    display: flex;
    align-items: center;
    gap: 24px;
    list-style: none;
}

.navbar-nav a {
    color: rgba(255,255,255,0.85);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.navbar-nav a:hover { color: var(--white); }

/* BUTTONS */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    text-decoration: none;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--blue);
    color: var(--white);
}

.btn-primary:hover { background: #1544b8; color: var(--white); }

.btn-outline {
    background: transparent;
    border: 1px solid rgba(255,255,255,0.4);
    color: var(--white);
}

.btn-outline:hover { background: rgba(255,255,255,0.1); color: var(--white); }

.btn-danger { background: var(--danger); color: var(--white); }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-block { width: 100%; justify-content: center; }

/* HERO */
.hero {
    background: var(--navy);
    color: var(--white);
    padding: 64px 32px;
    text-align: center;
}

.hero h1 { font-size: 42px; font-weight: 700; margin-bottom: 16px; }
.hero p { font-size: 18px; color: rgba(255,255,255,0.75); margin-bottom: 32px; }

/* CONTAINER */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section { padding: 40px 0; }

/* CARDS */
.card {
    background: var(--white);
    border-radius: 12px;
    border: 1px solid var(--border);
    padding: 24px;
    transition: box-shadow 0.2s;
}

.card:hover { box-shadow: 0 4px 16px rgba(0,0,0,0.08); }

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--navy);
}

.card-meta {
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 12px;
}

/* BADGES */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success { background: #D1FAE5; color: #065F46; }
.badge-warning { background: #FEF3C7; color: #92400E; }
.badge-danger { background: #FEE2E2; color: #991B1B; }
.badge-blue { background: #DBEAFE; color: #1E40AF; }

/* FORMS */
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-size: 14px; font-weight: 500; margin-bottom: 6px; }

.form-control {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.2s;
    background: var(--white);
}

.form-control:focus {
    outline: none;
    border-color: var(--blue);
    box-shadow: 0 0 0 3px rgba(26,86,219,0.1);
}

textarea.form-control { resize: vertical; min-height: 100px; }

/* AUTH */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    background: var(--navy);
}

.auth-box {
    background: var(--white);
    border-radius: 16px;
    padding: 40px;
    width: 100%;
    max-width: 440px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.auth-logo {
    text-align: center;
    margin-bottom: 32px;
}

.auth-logo .logo-text {
    font-size: 32px;
    font-weight: 700;
    color: var(--navy);
}

.auth-logo .logo-text span { color: var(--blue); }

.auth-title { font-size: 22px; font-weight: 600; margin-bottom: 6px; }
.auth-sub { color: var(--muted); font-size: 14px; margin-bottom: 28px; }

/* DASHBOARD */
.dashboard-layout {
    display: grid;
    grid-template-columns: 260px 1fr;
    min-height: calc(100vh - 64px);
}

.sidebar {
    background: var(--white);
    border-right: 1px solid var(--border);
    padding: 24px 0;
}

.sidebar-section {
    padding: 8px 20px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
    margin-top: 16px;
}

.sidebar a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    color: var(--text);
    text-decoration: none;
    font-size: 14px;
    transition: background 0.15s;
    border-left: 3px solid transparent;
}

.sidebar a:hover { background: var(--gray); }
.sidebar a.active { background: #EFF6FF; color: var(--blue); border-left-color: var(--blue); font-weight: 500; }

.main-content { padding: 32px; }

/* STATS */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--white);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid var(--border);
}

.stat-value { font-size: 32px; font-weight: 700; color: var(--navy); }
.stat-label { font-size: 13px; color: var(--muted); margin-top: 4px; }

/* ALERTS */
.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
}

.alert-success { background: #D1FAE5; color: #065F46; border: 1px solid #6EE7B7; }
.alert-danger { background: #FEE2E2; color: #991B1B; border: 1px solid #FCA5A5; }

/* SEARCH BAR */
.search-bar {
    background: var(--white);
    border-radius: 12px;
    padding: 24px;
    border: 1px solid var(--border);
    margin-bottom: 28px;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: flex-end;
}

.search-bar .form-group { margin-bottom: 0; flex: 1; min-width: 180px; }

/* MESSAGES */
.messages-layout {
    display: grid;
    grid-template-columns: 300px 1fr;
    height: calc(100vh - 64px);
}

.thread-list {
    background: var(--white);
    border-right: 1px solid var(--border);
    overflow-y: auto;
}

.thread-item {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: background 0.15s;
    text-decoration: none;
    display: block;
    color: var(--text);
}

.thread-item:hover { background: var(--gray); }
.thread-item.active { background: #EFF6FF; }
.thread-name { font-weight: 500; font-size: 14px; }
.thread-preview { font-size: 12px; color: var(--muted); margin-top: 2px; }

.chat-area {
    display: flex;
    flex-direction: column;
    background: var(--gray);
}

.chat-header {
    background: var(--white);
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    font-weight: 600;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.message-bubble {
    max-width: 65%;
    padding: 10px 14px;
    border-radius: 12px;
    font-size: 14px;
}

.message-bubble.sent {
    background: var(--blue);
    color: var(--white);
    align-self: flex-end;
    border-bottom-right-radius: 4px;
}

.message-bubble.received {
    background: var(--white);
    color: var(--text);
    align-self: flex-start;
    border-bottom-left-radius: 4px;
    border: 1px solid var(--border);
}

.message-time { font-size: 11px; opacity: 0.65; margin-top: 4px; }

.chat-input-area {
    background: var(--white);
    padding: 16px 24px;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 12px;
}

.chat-input-area input {
    flex: 1;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
}

/* ROLE SELECTOR */
.role-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 20px;
}

.role-card {
    border: 2px solid var(--border);
    border-radius: 10px;
    padding: 16px;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

.role-card:hover { border-color: var(--blue); }
.role-card.selected { border-color: var(--blue); background: #EFF6FF; }
.role-card h4 { font-size: 15px; font-weight: 600; margin-bottom: 4px; }
.role-card p { font-size: 12px; color: var(--muted); }

/* PAGE HEADER */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.page-header h2 { font-size: 24px; font-weight: 700; color: var(--navy); }

/* TABLE */
.table-wrap { background: var(--white); border-radius: 12px; border: 1px solid var(--border); overflow: hidden; }
table { width: 100%; border-collapse: collapse; }
th { background: var(--gray); padding: 12px 16px; text-align: left; font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); }
td { padding: 14px 16px; border-top: 1px solid var(--border); font-size: 14px; }
tr:hover td { background: #FAFBFC; }

/* RESPONSIVE */
@media (max-width: 768px) {
    .dashboard-layout { grid-template-columns: 1fr; }
    .sidebar { display: none; }
    .hero h1 { font-size: 28px; }
    .messages-layout { grid-template-columns: 1fr; }
}