:root {
  --bg: #0f1420;
  --bg-elevated: #161d2e;
  --card: #1a2236;
  --border: #2a3550;
  --text: #e8ecf6;
  --text-muted: #8b96b3;
  --accent: #6d8bff;
  --accent-strong: #4f6cf0;
  --green: #3ecf8e;
  --amber: #f0b04f;
  --red: #f26d6d;
  --radius: 14px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f4f6fb;
    --bg-elevated: #ffffff;
    --card: #ffffff;
    --border: #dde3f0;
    --text: #171c2b;
    --text-muted: #5c6478;
    --accent: #4f6cf0;
    --accent-strong: #3d57d6;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  height: 100%;
  -webkit-tap-highlight-color: transparent;
}

body { font-size: 16px; }

button, input, textarea {
  font-family: inherit;
  font-size: 16px;
  color: var(--text);
}

.hidden { display: none !important; }
.muted { color: var(--text-muted); }

/* ---------- Login overlay ---------- */

.overlay {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 50;
}

.login-card {
  width: 100%;
  max-width: 380px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
}

.login-card h1 {
  margin: 0 0 4px;
  font-size: 26px;
}

.login-card p { margin: 0 0 20px; line-height: 1.4; }

.field-label {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.login-card input[type="text"] {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  margin-bottom: 12px;
}

.divider {
  display: flex;
  align-items: center;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
  margin: 18px 0;
}
.divider::before, .divider::after {
  content: "";
  flex: 1;
  border-bottom: 1px solid var(--border);
}
.divider span { padding: 0 10px; }

.error-text {
  color: var(--red);
  font-size: 14px;
  margin-top: 12px;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 44px;
  padding: 10px 18px;
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  font-weight: 600;
  transition: transform 0.05s ease, opacity 0.15s ease;
}
.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: 0.5; cursor: default; }

.btn.primary { background: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-strong); }

.btn.secondary { background: var(--bg-elevated); border-color: var(--border); color: var(--text); }

.btn.ghost { background: transparent; border-color: var(--border); color: var(--text-muted); }

.btn.danger { background: transparent; border-color: var(--red); color: var(--red); }

.btn.small { min-height: 36px; padding: 6px 12px; font-size: 14px; }

.btn.full { width: 100%; margin-bottom: 8px; }

/* ---------- App shell ---------- */

.app-shell {
  display: flex;
  flex-direction: column;
  height: 100dvh;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
  flex-shrink: 0;
}

.brand { font-weight: 700; font-size: 18px; letter-spacing: 0.2px; }

.topbar-right { display: flex; gap: 8px; align-items: center; }

.chip {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 13px;
  white-space: nowrap;
}

.chip-btn { cursor: pointer; }

.tabbar {
  display: flex;
  overflow-x: auto;
  gap: 6px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
  flex-shrink: 0;
  -webkit-overflow-scrolling: touch;
}

.tab {
  flex: 0 0 auto;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 8px 14px;
  cursor: pointer;
  color: var(--text-muted);
  font-weight: 600;
  min-height: 40px;
}

.tab.active {
  background: var(--card);
  border-color: var(--border);
  color: var(--text);
}

.content {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  padding-bottom: 32px;
}

.view { display: none; }
.view.active { display: block; }

.view h2 { margin: 0 0 4px; font-size: 20px; }
.view h3 { margin: 24px 0 10px; font-size: 15px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.04em; }

/* ---------- Chat ---------- */

#view-chat.view.active {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 0;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.empty-state {
  margin: auto;
  text-align: center;
  max-width: 320px;
  color: var(--text-muted);
  line-height: 1.5;
}

.msg {
  max-width: 85%;
  padding: 12px 14px;
  border-radius: 16px;
  line-height: 1.45;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.msg.user {
  align-self: flex-end;
  background: var(--accent);
  color: #fff;
  border-bottom-right-radius: 4px;
}

.msg.assistant {
  align-self: flex-start;
  background: var(--card);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}

.msg.error {
  align-self: flex-start;
  background: rgba(242, 109, 109, 0.12);
  border: 1px solid var(--red);
  color: var(--red);
}

.msg-meta {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  color: var(--text-muted);
}

.msg.user .msg-meta { color: rgba(255,255,255,0.75); }

.typing { align-self: flex-start; color: var(--text-muted); font-size: 14px; padding: 4px 14px; }

.chat-input-bar {
  display: flex;
  gap: 8px;
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
  flex-shrink: 0;
}

.chat-input-bar textarea {
  flex: 1;
  resize: none;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--card);
  padding: 12px 14px;
  max-height: 120px;
}

.chat-toolbar {
  display: flex;
  justify-content: center;
  padding: 6px 0 10px;
  background: var(--bg-elevated);
  flex-shrink: 0;
}

/* ---------- Cards / grid ---------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}

.int-card { display: flex; flex-direction: column; gap: 10px; }

.int-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.int-card-title { font-weight: 700; font-size: 15px; }

.badge {
  font-size: 12px;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge.connected { background: rgba(62, 207, 142, 0.16); color: var(--green); }
.badge.mock { background: rgba(240, 176, 79, 0.16); color: var(--amber); }
.badge.disconnected { background: rgba(139, 150, 179, 0.16); color: var(--text-muted); }
.badge.live { background: rgba(62, 207, 142, 0.16); color: var(--green); }

.int-card-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.connect-form {
  display: none;
  flex-direction: column;
  gap: 8px;
  margin-top: 8px;
  padding-top: 10px;
  border-top: 1px dashed var(--border);
}

.connect-form.open { display: flex; }

.connect-form input {
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  width: 100%;
}

.connect-form label { font-size: 12px; color: var(--text-muted); margin-bottom: -4px; }

/* ---------- Billing ---------- */

.billing-summary { display: flex; flex-wrap: wrap; gap: 24px; align-items: baseline; }
.billing-stat { display: flex; flex-direction: column; gap: 2px; }
.billing-stat .value { font-size: 26px; font-weight: 700; }
.billing-stat .label { font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.04em; }

.plan-card { display: flex; flex-direction: column; gap: 8px; }
.plan-card .price { font-size: 22px; font-weight: 700; }

.ledger {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card);
}

.ledger-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}
.ledger-row:last-child { border-bottom: none; }

.ledger-row .amount.positive { color: var(--green); font-weight: 700; }
.ledger-row .amount.negative { color: var(--red); font-weight: 700; }

.ledger-empty { padding: 18px; color: var(--text-muted); text-align: center; font-size: 14px; }

/* ---------- Analytics ---------- */

.analytics-table {
  margin-top: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card);
}

.analytics-row {
  display: grid;
  grid-template-columns: 90px 1fr 70px 70px;
  gap: 8px;
  align-items: center;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}
.analytics-row:last-child { border-bottom: none; }
.analytics-row.head { color: var(--text-muted); font-weight: 700; text-transform: uppercase; font-size: 11px; }

.bar-track { background: var(--bg-elevated); border-radius: 6px; height: 10px; overflow: hidden; }
.bar-fill { height: 100%; background: var(--accent); }

.delta.up { color: var(--green); }
.delta.down { color: var(--red); }

/* ---------- Toast ---------- */

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  background: var(--card);
  border: 1px solid var(--border);
  padding: 12px 18px;
  border-radius: 12px;
  font-size: 14px;
  z-index: 100;
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
  max-width: 90vw;
}

@media (min-width: 720px) {
  .content { padding: 24px 32px; }
}