* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --primary: #1a56db;
  --primary-dark: #1341a8;
  --accent: #059669;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #1e293b;
  --text-light: #64748b;
  --border: #e2e8f0;
  --shadow: 0 1px 3px rgba(0,0,0,0.1);
  --radius: 12px;
  --max-w: 800px;
  --chat-user-bg: var(--primary);
  --chat-user-text: #fff;
  --chat-ai-bg: var(--card);
  --sidebar-bg: var(--card);
}
body.dark {
  --bg: #0f172a;
  --card: #1e293b;
  --text: #e2e8f0;
  --text-light: #94a3b8;
  --border: #334155;
  --shadow: 0 1px 3px rgba(0,0,0,0.4);
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --accent: #10b981;
  --chat-user-bg: #2563eb;
  --chat-user-text: #fff;
  --chat-ai-bg: #1e293b;
  --sidebar-bg: #1e293b;
}
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh; height: 100dvh;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; }
button { cursor: pointer; font-family: inherit; }
input, textarea { font-family: inherit; }

/* ── AUTH OVERLAY ── */
#authOverlay {
  position: fixed; inset: 0; z-index: 9999;
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #0f172a 100%);
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
}
body.dark #authOverlay { background: linear-gradient(135deg, #020617 0%, #0f172a 50%, #020617 100%); }
.auth-box {
  background: var(--card); border-radius: var(--radius);
  padding: 40px 32px; width: 100%; max-width: 400px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}
.auth-box h1 { font-size: 22px; color: var(--primary); margin-bottom: 4px; text-align: center; }
.auth-box p { font-size: 13px; color: var(--text-light); text-align: center; margin-bottom: 24px; }
.auth-tabs { display: flex; gap: 0; margin-bottom: 20px; background: #f1f5f9; border-radius: 8px; padding: 3px; }
.auth-tab { flex: 1; text-align: center; padding: 10px; font-size: 14px; font-weight: 600; border-radius: 6px; border: none; background: transparent; color: var(--text-light); transition: all 0.2s; }
.auth-tab.active { background: var(--card); color: var(--primary); box-shadow: var(--shadow); }
.auth-form { display: none; }
.auth-form.active { display: block; }
.auth-form label { font-size: 13px; font-weight: 600; display: block; margin-bottom: 6px; color: var(--text); }
.auth-form input { width: 100%; padding: 12px 14px; border: 1.5px solid var(--border); border-radius: 8px; font-size: 16px; margin-bottom: 14px; outline: none; transition: border 0.2s; }
.auth-form input:focus { border-color: var(--primary); }
.auth-form .btn { width: 100%; padding: 12px; border: none; border-radius: 8px; font-size: 15px; font-weight: 600; color: #fff; background: var(--primary); transition: background 0.2s; }
.auth-form .btn:hover { background: var(--primary-dark); }
.auth-form .btn:disabled { opacity: 0.6; }
.auth-error { color: #dc2626; font-size: 13px; text-align: center; margin-top: 10px; display: none; }
.auth-footer { font-size: 12px; color: var(--text-light); text-align: center; margin-top: 20px; }

/* ── APP LAYOUT ── */
.app-layout { display: flex; height: 100vh; height: 100dvh; overflow: hidden; }

/* COL 1: MAIN NAV */
.main-nav {
  width: 220px; background: #0f172a; color: #fff;
  display: flex; flex-direction: column; flex-shrink: 0;
  border-right: 1px solid var(--border);
}
body.dark .main-nav { background: #020617; }
.nav-brand { padding: 18px; font-weight: 800; font-size: 18px; border-bottom: 1px solid rgba(255,255,255,0.1); color: #fff; }
.nav-menu { flex: 1; overflow-y: auto; padding: 12px 0; display: flex; flex-direction: column; gap: 4px; }
.nav-menu .nav-tab, .nav-menu .nav-new {
  padding: 12px 20px; text-align: left; font-size: 13px; font-weight: 600;
  background: transparent; color: #94a3b8; border: none; cursor: pointer; transition: 0.2s;
  border-left: 3px solid transparent; width: 100%; display: block;
}
.nav-menu .nav-new { background: var(--primary); color: #fff; border-left: none; margin: 0 12px 12px; border-radius: 8px; text-align: center; width: auto; }
.nav-menu .nav-tab:hover { background: rgba(255,255,255,0.05); color: #fff; }
.nav-menu .nav-tab.active { background: rgba(255,255,255,0.1); color: #fff; border-left-color: var(--primary); }

/* COL 2: SIDEBAR (already defined) */

/* COL 3 & 4 WORKSPACE */
.main-workspace { flex: 1; display: flex; min-width: 0; }
.main-content { flex: 1; display: flex; flex-direction: column; min-width: 0; position: relative; }
.app-header { background: var(--card); border-bottom: 1px solid var(--border); flex-shrink: 0; }
.page-area { flex: 1; position: relative; min-height: 0; }
.page-area > div { position: absolute; inset: 0; display: none; flex-direction: column; overflow-y: auto; }
.page-area > div.active-panel { display: flex; }
.page-area > div#schedulePanel.active-panel { flex-direction: column; }
.sidebar {
  width: 300px; background: var(--sidebar-bg); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; flex-shrink: 0;
  transition: transform 0.3s ease;
}
@media (min-width: 769px) {
  #menuBtn { display: none; }
  #closeSidebar { display: none; }
}
.sidebar-header {
  padding: 16px 18px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
}
.sidebar-header h2 { font-size: 15px; font-weight: 700; color: var(--primary); }
.sidebar-header button { background: none; border: none; color: var(--text-light); font-size: 18px; }
.sidebar-user { padding: 12px 18px; border-bottom: 1px solid var(--border); font-size: 13px; color: var(--text-light); display: flex; align-items: center; gap: 8px; }
.sidebar-user .logout-btn { margin-left: auto; background: none; border: none; color: #dc2626; font-size: 12px; font-weight: 600; }
.conversation-list { flex: 1; overflow-y: auto; padding: 8px 0; }
.conv-item {
  padding: 14px 18px; cursor: pointer; border-bottom: 1px solid #f1f5f9;
  transition: background 0.15s; position: relative;
}
.conv-item:hover { background: #f8fafc; }
.conv-item.active { background: #eff6ff; border-left: 3px solid var(--primary); }
.conv-item .title { font-size: 14px; font-weight: 600; margin-bottom: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.conv-item .meta { font-size: 11px; color: var(--text-light); }
.conv-item .delete-btn { position: absolute; top: 14px; right: 12px; background: none; border: none; color: #ccc; font-size: 14px; display: none; }
.conv-item:hover .delete-btn { display: block; }
.conv-item .delete-btn:hover { color: #dc2626; }
.sidebar-footer-btn {
  padding: 14px 18px; border-top: 1px solid var(--border);
  text-align: center;
}
.sidebar-footer-btn button { background: var(--primary); border: none; color: #fff; padding: 10px; border-radius: 8px; font-size: 13px; font-weight: 600; width: 100%; }

/* ── CHAT AREA ── */
.chat-area, .chat-main {
  flex: 1; display: flex; flex-direction: column; min-width: 0;
  background: var(--bg);
}
.chat-header { background: var(--card); border-bottom: 1px solid var(--border); flex-shrink: 0; }
.header-row { display: flex; align-items: center; gap: 10px; padding: 8px 16px; }
.header-row .menu-btn { background: none; border: none; font-size: 22px; color: var(--text); cursor: pointer; }
.header-row .chat-title { font-size: 15px; font-weight: 700; flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.header-row .header-actions { display: flex; gap: 6px; }
.header-row .pdf-btn { background: var(--accent); border: none; color: #fff; padding: 6px 12px; border-radius: 6px; font-size: 11px; font-weight: 600; cursor: pointer; white-space: nowrap; }

/* COL 4: AI CHAT SIDEPANEL */
.ai-chat-sidepanel {
  width: 380px; background: var(--card); border-left: 1px solid var(--border);
  display: flex; flex-direction: column; flex-shrink: 0;
}
.ai-chat-header {
  padding: 15px 18px; border-bottom: 1px solid var(--border); font-size: 14px; font-weight: 700; color: var(--primary);
  background: var(--card); flex-shrink: 0;
}

/* WORD DOCUMENT STYLES (COL 3) */
.document-workspace {
  background: var(--bg);
  padding: 40px 20px;
  display: flex;
  justify-content: center;
  min-height: 100%;
}
.document-page {
  background: #ffffff;
  width: 100%;
  max-width: 850px;
  min-height: 1100px;
  padding: 60px 80px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  border: 1px solid var(--border);
  font-family: 'Times New Roman', serif;
  font-size: 16px;
  line-height: 1.6;
  color: #111;
  outline: none;
}
body.dark .document-page {
  background: #1e293b;
  color: #f1f5f9;
  border-color: #334155;
  box-shadow: 0 4px 12px rgba(0,0,0,0.5);
}

.messages-container {
  flex: 1; overflow-y: auto; padding: 20px;
  display: flex; flex-direction: column; gap: 16px;
}
.welcome-msg {
  text-align: center; padding: 60px 20px 40px; margin: auto;
  max-width: 520px; width: 100%;
}
.welcome-msg h3 { font-size: 24px; color: var(--primary); margin-bottom: 10px; font-weight: 800; }
.welcome-msg p { font-size: 15px; color: var(--text-light); line-height: 1.7; margin-bottom: 8px; }
.welcome-msg .suggestions { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 24px; }
.welcome-msg .suggestion-btn {
  background: var(--card); border: 1.5px solid var(--border); border-radius: 20px;
  padding: 10px 20px; font-size: 13px; color: var(--text); cursor: pointer; transition: all 0.2s;
  font-weight: 600; box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.welcome-msg .suggestion-btn:hover { border-color: var(--primary); color: var(--primary); background: #eff6ff; transform: translateY(-1px); box-shadow: 0 2px 6px rgba(99,102,241,0.12); }

.message {
  max-width: 85%; padding: 12px 16px; border-radius: 12px;
  font-size: 14px; line-height: 1.6; white-space: pre-wrap; word-break: break-word;
}
.message.user { align-self: flex-end; background: var(--chat-user-bg); color: var(--chat-user-text); border-bottom-right-radius: 4px; }
.message.assistant { align-self: flex-start; background: var(--chat-ai-bg); border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.message .label { font-size: 11px; font-weight: 700; margin-bottom: 4px; opacity: 0.7; }
.message.assistant .label { color: var(--accent); }
.message.user .label { color: rgba(255,255,255,0.7); }

.typing-indicator { display: flex; align-items: center; gap: 6px; padding: 12px 16px; background: var(--card); border: 1px solid var(--border); border-radius: 12px; align-self: flex-start; border-bottom-left-radius: 4px; }
.typing-dot { width: 8px; height: 8px; background: var(--text-light); border-radius: 50%; animation: typing 1.4s infinite; }
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes typing { 0%,60%,100% { opacity: 0.3; transform: scale(0.8); } 30% { opacity: 1; transform: scale(1); } }

/* ── INPUT AREA ── */
.input-area {
  padding: 16px 20px; border-top: 1px solid var(--border);
  background: var(--card);
}
.input-wrapper {
  display: flex; gap: 10px; align-items: flex-end;
  max-width: var(--max-w); margin: 0 auto;
}
.input-wrapper textarea {
  flex: 1; resize: none; border: 1.5px solid var(--border); border-radius: 10px;
  padding: 12px 14px; font-size: 15px; outline: none; min-height: 48px; max-height: 120px;
  line-height: 1.4; transition: border 0.2s;
}
.input-wrapper textarea:focus { border-color: var(--primary); }
.input-wrapper .send-btn {
  background: var(--primary); border: none; color: #fff; width: 48px; height: 48px;
  border-radius: 10px; font-size: 20px; display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; transition: background 0.2s;
}
.input-wrapper .send-btn:hover { background: var(--primary-dark); }
.input-wrapper .send-btn:disabled { opacity: 0.5; }
/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  .sidebar { 
    width: 280px; 
    position: fixed; top: 0; left: 0; bottom: 0; z-index: 100;
    transform: translateX(0);
  }
  .sidebar.closed { transform: translateX(-100%); }
  .sidebar-backdrop { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.4); z-index: 99; }
  .sidebar-backdrop.open { display: block; }
  .message { max-width: 92%; }
  .auth-box { padding: 28px 20px; }
}
@media (max-width: 480px) {
  .message { font-size: 15px; padding: 10px 14px; }
  .input-area { padding: 10px 12px; }
  .input-wrapper textarea { font-size: 16px; }
  .messages-container { padding: 12px; }
  .header-row { padding: 6px 12px; }
  .nav-row .nav-tab { font-size: 10px !important; padding: 6px 8px !important; }
  .nav-row .nav-new { font-size: 10px !important; padding: 5px 10px !important; }
  .header-row .pdf-btn { font-size: 10px !important; padding: 4px 8px !important; }

  #calGrid > div { min-height: 40px !important; font-size: 10px !important; }
  #calGrid > div > div:first-child { font-size: 11px !important; }
}

/* ── TOAST ── */
.toast { position: fixed; bottom: 80px; left: 50%; transform: translateX(-50%); padding: 12px 20px; border-radius: 8px; font-size: 14px; font-weight: 600; color: #fff; z-index: 10000; opacity: 0; transition: opacity 0.3s; pointer-events: none; }
.toast.show { opacity: 1; }
.toast.success { background: var(--accent); }
.toast.error { background: #dc2626; }

/* ── DYNAMIC PANELS ── */
.panel-content { display: none; flex: 1; overflow-y: auto; padding: 20px; background: var(--bg); }
.panel-content.active-panel { display: flex; flex-direction: column; }
#clientsPanel.panel-content { padding: 0; }
select option { background-color: var(--bg); color: var(--text); }