/* ── Reset & base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0f0f11;
  --surface: #1a1a1f;
  --surface2: #242429;
  --border: #2e2e36;
  --accent: #7c6af5;
  --accent-dim: #4a3fa0;
  --text: #e8e8ec;
  --text-dim: #888;
  --error: #e05252;
  --success: #4caf8a;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', monospace;
  --sidebar-w: 240px;
}

html, body { height: 100%; }
body { font-family: var(--font); background: var(--bg); color: var(--text); font-size: 15px; line-height: 1.6; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Login ── */
.login-page {
  display: flex; align-items: center; justify-content: center; min-height: 100vh;
}
.login-box {
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  padding: 40px; width: 340px; display: flex; flex-direction: column; gap: 16px;
}
.login-box h1 { font-size: 20px; }
.login-box .sub { color: var(--text-dim); font-size: 13px; }
.login-box .error { color: var(--error); font-size: 13px; }
.login-box form { display: flex; flex-direction: column; gap: 12px; }
.login-box input, .login-box button {
  padding: 10px 14px; border-radius: 8px; font-size: 14px; font-family: var(--font);
}
.login-box input { background: var(--surface2); border: 1px solid var(--border); color: var(--text); }
.login-box input:focus { outline: 2px solid var(--accent); }
.login-box button {
  background: var(--accent); color: #fff; border: none; cursor: pointer; font-weight: 600;
}
.login-box button:hover { background: var(--accent-dim); }

/* ── Hub layout ── */
.hub-page { display: flex; height: 100vh; overflow: hidden; }

.sidebar {
  width: var(--sidebar-w); background: var(--surface); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; overflow-y: auto; flex-shrink: 0;
}
.sidebar-header {
  padding: 16px; border-bottom: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 4px;
}
.logo { font-weight: 700; font-size: 15px; color: var(--text); }
.user-badge { font-size: 11px; color: var(--accent); text-transform: uppercase; letter-spacing: 0.08em; }
.sidebar-section { padding: 12px 16px; }
.sidebar-section h3 { font-size: 11px; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 8px; }
.new-chat-btn {
  display: block; padding: 8px 12px; background: var(--accent); color: #fff;
  border-radius: 8px; font-size: 13px; font-weight: 600; text-align: center; margin-bottom: 8px;
}
.new-chat-btn:hover { background: var(--accent-dim); text-decoration: none; }
.project-list, .conv-list { list-style: none; display: flex; flex-direction: column; gap: 2px; }
.project-list li a, .conv-list li a {
  display: block; padding: 6px 8px; border-radius: 6px; font-size: 13px; color: var(--text-dim);
}
.project-list li a:hover, .conv-list li a:hover,
.project-list li.active a { color: var(--text); background: var(--surface2); text-decoration: none; }
.sidebar-footer { margin-top: auto; padding: 16px; border-top: 1px solid var(--border); }
.logout-btn {
  background: none; border: 1px solid var(--border); color: var(--text-dim);
  padding: 6px 12px; border-radius: 6px; cursor: pointer; font-size: 12px; width: 100%;
}
.logout-btn:hover { color: var(--text); border-color: var(--text-dim); }

/* ── Main area ── */
.main-area { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
.welcome { padding: 60px 40px; max-width: 600px; }
.welcome h2 { font-size: 24px; margin-bottom: 8px; }
.welcome p { color: var(--text-dim); }
.welcome code { background: var(--surface2); padding: 2px 6px; border-radius: 4px; font-family: var(--mono); font-size: 13px; }

/* ── Chat ── */
.chat-area { display: flex; flex-direction: column; }
.chat-header {
  padding: 12px 20px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 16px; flex-shrink: 0; background: var(--surface);
}
.chat-header h2 { font-size: 16px; font-weight: 600; }
.project-name { font-weight: 400; color: var(--text-dim); margin-left: 4px; }
.model-picker { margin-left: auto; }
.model-picker select {
  background: var(--surface2); border: 1px solid var(--border); color: var(--text);
  padding: 6px 10px; border-radius: 8px; font-size: 13px; font-family: var(--font);
}

.messages {
  flex: 1; overflow-y: auto; padding: 20px; display: flex; flex-direction: column; gap: 20px;
}
.message { max-width: 800px; }
.message-user { align-self: flex-end; }
.message-user .message-content {
  background: var(--accent-dim); color: #fff;
  padding: 12px 16px; border-radius: 16px 16px 4px 16px;
}
.message-assistant .message-content {
  background: var(--surface); border: 1px solid var(--border);
  padding: 16px 20px; border-radius: 4px 16px 16px 16px;
}
.message-content p { margin-bottom: 8px; }
.message-content p:last-child { margin-bottom: 0; }
.message-content pre { background: #1e1e2e; padding: 14px; border-radius: 8px; overflow-x: auto; margin: 12px 0; }
.message-content code { font-family: var(--mono); font-size: 13px; }
.message-content :not(pre) > code { background: var(--surface2); padding: 2px 5px; border-radius: 4px; }

.message-meta {
  display: flex; align-items: center; gap: 8px; margin-top: 8px; flex-wrap: wrap;
}
.model-tag, .search-tag, .cost-tag {
  font-size: 11px; padding: 2px 8px; border-radius: 100px; border: 1px solid var(--border); color: var(--text-dim);
}
.search-tag { color: var(--success); border-color: var(--success); }
.export-btns { display: flex; gap: 6px; margin-left: auto; }
.export-btn {
  font-size: 12px; padding: 4px 10px; border-radius: 6px;
  background: var(--surface2); border: 1px solid var(--border); color: var(--text);
  cursor: pointer;
}
.export-btn:hover { border-color: var(--accent); color: var(--accent); }

.input-area {
  border-top: 1px solid var(--border); padding: 16px 20px; flex-shrink: 0; background: var(--surface);
}
.data-sovereignty-flag {
  background: #3a2020; border: 1px solid #7a3535; color: #e08080;
  padding: 8px 14px; border-radius: 8px; font-size: 13px; margin-bottom: 10px;
}
#chat-form { display: flex; flex-direction: column; gap: 8px; }
#msg-input {
  width: 100%; background: var(--surface2); border: 1px solid var(--border); color: var(--text);
  padding: 12px 16px; border-radius: 12px; font-family: var(--font); font-size: 14px; resize: none;
}
#msg-input:focus { outline: 2px solid var(--accent); }
.input-controls { display: flex; align-items: center; gap: 12px; }
.sovereignty-toggle { font-size: 12px; color: var(--text-dim); cursor: pointer; display: flex; align-items: center; gap: 6px; }
#send-btn {
  margin-left: auto; background: var(--accent); color: #fff; border: none;
  padding: 10px 24px; border-radius: 8px; font-weight: 600; cursor: pointer; font-size: 14px;
}
#send-btn:hover { background: var(--accent-dim); }
#send-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Admin ── */
.admin-page { padding: 0; }
.admin-header {
  background: var(--surface); border-bottom: 1px solid var(--border);
  padding: 16px 32px; display: flex; align-items: center; justify-content: space-between;
}
.admin-header h1 { font-size: 18px; }
.admin-section { padding: 32px; border-bottom: 1px solid var(--border); max-width: 1000px; }
.admin-section h2 { font-size: 16px; margin-bottom: 16px; }
.admin-table { width: 100%; border-collapse: collapse; font-size: 13px; margin-bottom: 20px; }
.admin-table th { text-align: left; padding: 8px 12px; color: var(--text-dim); border-bottom: 1px solid var(--border); }
.admin-table td { padding: 8px 12px; border-bottom: 1px solid var(--border); }
.add-form { margin-top: 16px; }
.add-form summary { cursor: pointer; color: var(--accent); font-size: 13px; }
.add-form form { margin-top: 12px; display: flex; flex-direction: column; gap: 10px; max-width: 500px; }
.add-form input, .add-form select, .add-form textarea {
  background: var(--surface2); border: 1px solid var(--border); color: var(--text);
  padding: 8px 12px; border-radius: 8px; font-family: var(--font); font-size: 13px;
}
.add-form button {
  background: var(--accent); color: #fff; border: none; padding: 8px 20px;
  border-radius: 8px; cursor: pointer; font-weight: 600; align-self: flex-start;
}

/* ── Mobile menu toggle ── */
.mobile-menu-btn {
  display: none; background: var(--surface2); border: 1px solid var(--border);
  color: var(--text); padding: 8px 12px; border-radius: 8px; cursor: pointer;
  font-size: 14px; margin-right: 12px;
}

.sidebar-overlay {
  display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 90;
}

.mobile-topbar { display: none; }
@media (max-width: 768px) {
  .mobile-topbar {
    display: flex; align-items: center; gap: 12px;
    padding: 12px 14px; border-bottom: 1px solid var(--border); background: var(--surface);
  }
}

/* ── Mobile breakpoint ── */
@media (max-width: 768px) {
  body { font-size: 14px; }

  .mobile-menu-btn { display: inline-flex; align-items: center; }

  .sidebar {
    position: fixed; top: 0; left: 0; height: 100vh;
    transform: translateX(-100%); transition: transform 0.25s ease;
    z-index: 100; width: 80vw; max-width: 300px;
    box-shadow: 2px 0 20px rgba(0,0,0,0.5);
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-overlay.active { display: block; }

  .main-area { width: 100%; }

  .chat-header { padding: 10px 14px; gap: 10px; flex-wrap: wrap; }
  .chat-header h2 { font-size: 14px; flex: 1; }
  .model-picker { width: 100%; order: 3; }
  .model-picker select { width: 100%; font-size: 14px; padding: 8px 10px; }

  .messages { padding: 14px; gap: 16px; }
  .message { max-width: 100%; }
  .message-user .message-content,
  .message-assistant .message-content {
    padding: 10px 14px; font-size: 14px;
  }
  .message-content pre { padding: 10px; font-size: 12px; }

  .message-meta { gap: 6px; }
  .model-tag, .search-tag, .cost-tag { font-size: 10px; padding: 2px 6px; }
  .export-btns { margin-left: 0; width: 100%; gap: 4px; }
  .export-btn { flex: 1; font-size: 11px; padding: 6px 8px; }

  .input-area { padding: 10px 12px; }
  #msg-input { font-size: 16px; padding: 10px 12px; } /* 16px prevents iOS zoom */
  .input-controls { flex-wrap: wrap; gap: 8px; }
  #send-btn { padding: 10px 20px; font-size: 14px; flex: 1; }

  .welcome { padding: 40px 20px; }
  .welcome h2 { font-size: 20px; }

  /* Admin */
  .admin-header { padding: 12px 16px; flex-direction: column; align-items: flex-start; gap: 8px; }
  .admin-header h1 { font-size: 16px; }
  .admin-section { padding: 20px 16px; }
  .admin-table { font-size: 12px; display: block; overflow-x: auto; white-space: nowrap; }
  .add-form form { max-width: 100%; }
  .add-form input, .add-form select, .add-form textarea { font-size: 14px; }

  /* Login */
  .login-box { width: 90vw; max-width: 340px; padding: 28px 24px; }
}

@media (max-width: 420px) {
  .hero h1 { font-size: 26px; }
  .section { padding: 36px 16px; }
  .section h2 { font-size: 18px; }
}