:root {
    --bg: #0b1220;
    --surface: #121a2b;
    --surface-2: #182236;
    --border: #243049;
    --text: #e8eef9;
    --muted: #8fa0bf;
    --accent: #3b82f6;
    --accent-2: #6366f1;
    --success: #22c55e;
    --danger: #ef4444;
    --warning: #f59e0b;
    --radius: 14px;
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    font-family: "DM Sans", system-ui, sans-serif;
    background: radial-gradient(circle at top, #152038 0%, var(--bg) 45%);
    color: var(--text);
    min-height: 100vh;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
    background: rgba(11, 18, 32, 0.85);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 10;
}

.brand { display: flex; align-items: center; gap: 0.75rem; }
.brand-mark {
    width: 42px; height: 42px; border-radius: 12px;
    display: grid; place-items: center;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    font-weight: 700;
}
.brand small { display: block; color: var(--muted); }

.nav { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.nav a {
    color: var(--muted);
    padding: 0.5rem 0.85rem;
    border-radius: 999px;
    text-decoration: none;
}
.nav a.active, .nav a:hover {
    color: var(--text);
    background: var(--surface-2);
    text-decoration: none;
}

.user-menu { display: flex; align-items: center; gap: 0.75rem; color: var(--muted); }

.page-header { margin-bottom: 1.5rem; }
.page-header h1 { margin: 0 0 0.35rem; font-size: 1.75rem; }
.page-header p { margin: 0; color: var(--muted); }

.grid { display: grid; gap: 1rem; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    box-shadow: var(--shadow);
}

.card h3 { margin: 0 0 0.35rem; font-size: 1rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.92rem; }

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0.75rem 0 0.25rem;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.55rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.badge-success { background: rgba(34, 197, 94, 0.15); color: #86efac; }
.badge-danger { background: rgba(239, 68, 68, 0.15); color: #fca5a5; }
.badge-muted { background: rgba(143, 160, 191, 0.15); color: var(--muted); }
.badge-warning { background: rgba(245, 158, 11, 0.15); color: #fcd34d; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    padding: 0.65rem 1rem;
    border-radius: 10px;
    border: 1px solid transparent;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
}
.btn:hover { text-decoration: none; filter: brightness(1.05); }
.btn-primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: white; }
.btn-secondary { background: var(--surface-2); color: var(--text); border-color: var(--border); }
.btn-ghost { background: transparent; color: var(--muted); border-color: var(--border); }
.btn-sm { padding: 0.4rem 0.75rem; font-size: 0.85rem; }

.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.35rem; color: var(--muted); font-size: 0.9rem; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 0.75rem 0.85rem;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--surface-2);
    color: var(--text);
}
.form-group textarea { min-height: 120px; resize: vertical; }

.alert {
    padding: 0.85rem 1rem;
    border-radius: 10px;
    margin-bottom: 1rem;
    border: 1px solid var(--border);
}
.alert-error { background: rgba(239, 68, 68, 0.12); color: #fecaca; }
.alert-success { background: rgba(34, 197, 94, 0.12); color: #bbf7d0; }
.alert-info { background: rgba(59, 130, 246, 0.12); color: #bfdbfe; }

.auth-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 2rem;
}
.auth-card {
    width: min(440px, 100%);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: calc(var(--radius) + 4px);
    padding: 2rem;
    box-shadow: var(--shadow);
}

.platform-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
}
.platform-row:last-child { border-bottom: 0; }
.platform-meta { display: flex; flex-direction: column; gap: 0.2rem; }

.client-banner {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 0.6rem 1rem;
    background: rgba(99, 102, 241, 0.15);
    border-bottom: 1px solid var(--border);
    color: var(--muted);
    font-size: 0.9rem;
}

.totals-banner {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding: 1.25rem;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.12), rgba(99, 102, 241, 0.08));
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.total-stat { display: flex; flex-direction: column; gap: 0.25rem; }
.total-label {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--muted);
}
.total-value { font-size: 1.35rem; font-weight: 700; }

.platform-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 0.25rem;
}
.platform-card h3 { margin: 0; }
.platform-account {
    margin: 0.15rem 0 0;
    font-size: 0.82rem;
    color: var(--muted);
}
.stat-caption {
    margin: 0 0 0.75rem;
    font-size: 0.82rem;
    color: var(--muted);
}
.metric-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}
.metric-chip {
    background: var(--surface-2);
    border-radius: 8px;
    padding: 0.5rem;
    text-align: center;
}
.metric-label {
    display: block;
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--muted);
    margin-bottom: 0.15rem;
}
.metric-value {
    display: block;
    font-size: 0.95rem;
    font-weight: 600;
}
.steps-list {
    margin: 0.75rem 0 0;
    padding-left: 1.25rem;
    color: var(--muted);
    line-height: 1.8;
}
.steps-list li { margin-bottom: 0.25rem; }

.action-group { display: flex; flex-wrap: wrap; gap: 0.35rem; }
#campaigns-table input.budget-input { max-width: 100px; }

.chat-panel { display: grid; grid-template-rows: 1fr auto; min-height: 520px; }
.chat-log {
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-height: 520px;
}
.chat-bubble {
    max-width: 85%;
    padding: 0.85rem 1rem;
    border-radius: 14px;
    line-height: 1.5;
}
.chat-bubble.user { align-self: flex-end; background: rgba(59, 130, 246, 0.2); }
.chat-bubble.assistant { align-self: flex-start; background: var(--surface-2); }
.chat-input { display: flex; gap: 0.75rem; padding: 1rem; border-top: 1px solid var(--border); }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 0.75rem; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.04em; }

@media (max-width: 768px) {
    .topbar { flex-direction: column; align-items: flex-start; }
    .nav { width: 100%; overflow-x: auto; }
}