/* =================================================
   APP CSS — Matrix Terminal Chat Interface
   ================================================= */

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

:root {
  --green: #00ff41;
  --green-bright: #39ff72;
  --green-mid: #00cc33;
  --green-dim: #00aa2e;
  --green-dark: #006611;
  --green-ghost: #003d11;
  --green-glow: rgba(0, 255, 65, 0.25);
  --green-glow-strong: rgba(0, 255, 65, 0.45);
  --green-tint: rgba(0, 255, 65, 0.04);
  --green-tint-2: rgba(0, 255, 65, 0.08);
  --green-tint-3: rgba(0, 255, 65, 0.14);

  --black: #000000;
  --black-light: #0a0a0a;
  --surface: #080808;

  --text: #00ff41;
  --text-dim: #00aa2e;
  --text-ghost: #005518;
  --text-white: #c0ffd0;
  --text-muted: #338844;

  --border: rgba(0, 255, 65, 0.12);
  --border-hover: rgba(0, 255, 65, 0.3);
  --border-strong: rgba(0, 255, 65, 0.5);

  --font: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
}

body {
  font-family: var(--font);
  background: var(--black);
  color: var(--green);
  height: 100vh;
  overflow: hidden;
  margin: 0;
}

/* --- CRT Scanlines --- */
.scanlines {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  background: repeating-linear-gradient(
    0deg,
    rgba(0, 0, 0, 0.15) 0px,
    rgba(0, 0, 0, 0.15) 1px,
    transparent 1px,
    transparent 3px
  );
  opacity: 0.35;
}

.scanlines::after {
  content: '';
  position: fixed;
  inset: 0;
  background: rgba(0, 255, 65, 0.006);
  animation: flicker 0.15s infinite alternate;
  pointer-events: none;
}

@keyframes flicker {
  0% { opacity: 0.97; }
  100% { opacity: 1; }
}

/* =========================
   APP LAYOUT
   ========================= */
.app-container {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* =========================
   SIDEBAR
   ========================= */
.sidebar {
  width: 280px;
  background: var(--black-light);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  height: 100vh;
  flex-shrink: 0;
  overflow: hidden;
}

/* Sidebar Header */
.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--green-tint);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--green);
  text-decoration: none;
  text-shadow: 0 0 8px var(--green-glow);
  transition: text-shadow 0.2s;
}

.sidebar-logo:hover {
  text-shadow: 0 0 14px var(--green-glow-strong);
}

.logo-icon {
  color: var(--green);
}

.new-chat-btn {
  padding: 6px 12px;
  background: var(--green-tint);
  border: 1px solid var(--border);
  color: var(--green);
  font-size: 0.78rem;
  cursor: pointer;
  font-family: var(--font);
  font-weight: 600;
  transition: all 0.2s;
}

.new-chat-btn:hover {
  border-color: var(--green);
  background: var(--green-tint-3);
  box-shadow: 0 0 10px var(--green-glow);
  text-shadow: 0 0 4px var(--green-glow);
}

/* Sidebar Content / History */
.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}

.sidebar-content::-webkit-scrollbar { width: 4px; }
.sidebar-content::-webkit-scrollbar-track { background: transparent; }
.sidebar-content::-webkit-scrollbar-thumb { background: var(--green-ghost); }

.history-section {
  padding: 0;
}

.history-label {
  display: block;
  font-size: 0.68rem;
  color: var(--text-ghost);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: 14px 18px 6px;
  font-weight: 600;
}

.history-item {
  display: flex;
  align-items: center;
  padding: 12px 18px;
  cursor: pointer;
  transition: all 0.2s;
  border-left: 2px solid transparent;
  font-size: 0.82rem;
  color: var(--text-dim);
}

.history-item:hover {
  background: var(--green-tint);
  color: var(--green);
}

.history-item.active {
  background: var(--green-tint-2);
  border-left-color: var(--green);
  color: var(--green);
  text-shadow: 0 0 4px var(--green-glow);
}

/* Sidebar Footer */
.sidebar-footer {
  padding: 14px 18px;
  border-top: 1px solid var(--border);
  background: var(--green-tint);
}

.user-info {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  font-size: 0.82rem;
  color: var(--text-dim);
}

.user-avatar {
  width: 32px;
  height: 32px;
  background: var(--green);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.82rem;
  color: var(--black);
  font-weight: 700;
  flex-shrink: 0;
}

.sidebar-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.sidebar-links a {
  color: var(--text-ghost);
  text-decoration: none;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: color 0.2s, text-shadow 0.2s;
}

.sidebar-links a:hover {
  color: var(--green);
  text-shadow: 0 0 6px var(--green-glow);
}

/* =========================
   SIDEBAR TOGGLE (mobile)
   ========================= */
.sidebar-toggle {
  display: none;
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 101;
  width: 40px;
  height: 40px;
  background: var(--black);
  border: 1px solid var(--border);
  color: var(--green);
  font-size: 0.85rem;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  font-family: var(--font);
  font-weight: 700;
  transition: all 0.2s;
}

.sidebar-toggle:hover {
  border-color: var(--green);
  box-shadow: 0 0 10px var(--green-glow);
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  z-index: 99;
}

.sidebar-overlay.active {
  display: block;
}

/* =========================
   MAIN CHAT AREA
   ========================= */
.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  min-width: 0;
  background: var(--black);
}

.chat-container {
  flex: 1;
  overflow-y: auto;
  position: relative;
}

.chat-container::-webkit-scrollbar { width: 5px; }
.chat-container::-webkit-scrollbar-track { background: transparent; }
.chat-container::-webkit-scrollbar-thumb { background: var(--green-ghost); }

/* =========================
   EMPTY STATE
   ========================= */
.chat-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: 40px 24px;
  text-align: center;
}

.empty-logo {
  width: 80px;
  height: 80px;
  border: 1px solid var(--border-hover);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  color: var(--green);
  margin-bottom: 24px;
  text-shadow: 0 0 14px var(--green-glow);
  background: var(--green-tint);
  box-shadow: 0 0 30px rgba(0, 255, 65, 0.06);
}

.chat-empty h1 {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--green);
  text-shadow: 0 0 10px var(--green-glow);
  letter-spacing: -0.02em;
}

.dev-notice {
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-bottom: 36px;
  line-height: 1.7;
  max-width: 450px;
}

.notice-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border: 1px solid rgba(0, 255, 65, 0.3);
  color: #00ff41;
  font-size: 0.72rem;
  font-weight: 600;
  margin-bottom: 10px;
  text-shadow: 0 0 6px rgba(0, 255, 65, 0.2);
}

/* Suggestion Cards */
.suggestion-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  max-width: 560px;
  width: 100%;
}

.suggestion-card {
  background: var(--black);
  padding: 20px 18px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.suggestion-card:hover {
  background: var(--green-tint);
}

.card-icon {
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  background: var(--green-tint);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--green);
  flex-shrink: 0;
  transition: all 0.2s;
}

.suggestion-card:hover .card-icon {
  background: var(--green);
  color: var(--black);
  border-color: var(--green);
  box-shadow: 0 0 12px var(--green-glow);
}

.card-text {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.card-text strong {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--green);
}

.card-text span {
  font-size: 0.75rem;
  color: var(--text-ghost);
}

/* =========================
   MESSAGES
   ========================= */
.messages-container {
  display: none;
  flex-direction: column;
}

.messages-container.active {
  display: flex;
}

.message-row {
  display: flex;
  gap: 14px;
  padding: 22px 36px;
  border-bottom: 1px solid var(--border);
  transition: background 0.2s;
}

.message-row:hover {
  background: var(--green-tint);
}

.message-row.user {
  background: var(--black);
}

.message-row.bot {
  background: var(--green-tint);
}

.message-avatar {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.82rem;
  flex-shrink: 0;
  font-weight: 700;
}

.message-row.user .message-avatar {
  background: var(--green);
  color: var(--black);
}

.message-row.bot .message-avatar {
  background: var(--green);
  color: var(--black);
  box-shadow: 0 0 10px var(--green-glow);
}

.message-content {
  flex: 1;
  min-width: 0;
}

.message-sender {
  font-size: 0.78rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.message-row.user .message-sender {
  color: var(--text-white);
}

.message-row.bot .message-sender {
  color: var(--green);
  text-shadow: 0 0 6px var(--green-glow);
}

.message-text {
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--text-dim);
}

.message-text p { margin-bottom: 8px; }
.message-text p:last-child { margin-bottom: 0; }

.message-text a {
  color: var(--green);
  text-decoration: underline;
  transition: text-shadow 0.2s;
}

.message-text a:hover {
  text-shadow: 0 0 6px var(--green-glow);
}

.message-text strong {
  color: var(--green);
  font-weight: 700;
}

/* Message code blocks */
.message-text code {
  background: var(--green-tint-2);
  border: 1px solid var(--border);
  padding: 2px 6px;
  font-size: 0.82rem;
  color: var(--green);
}

.message-text pre {
  background: var(--black-light);
  border: 1px solid var(--border);
  padding: 14px;
  margin: 10px 0;
  overflow-x: auto;
}

.message-text pre code {
  background: transparent;
  border: none;
  padding: 0;
  color: var(--green);
  font-size: 0.82rem;
  line-height: 1.6;
}

/* Message lists */
.message-text ul,
.message-text ol {
  margin: 8px 0;
  padding-left: 0;
  list-style: none;
}

.message-text ul li {
  padding: 3px 0;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.message-text ul li::before {
  content: ">";
  color: var(--green);
  font-weight: 700;
  text-shadow: 0 0 4px var(--green-glow);
  flex-shrink: 0;
}

.message-text ol {
  padding-left: 18px;
  list-style: decimal;
}

.message-text ol li { padding: 3px 0; }

/* =========================
   TYPING INDICATOR
   ========================= */
.typing-row {
  display: flex;
  gap: 14px;
  padding: 22px 36px;
  background: var(--green-tint);
  border-bottom: 1px solid var(--border);
}

.typing-row .message-avatar {
  background: var(--green);
  color: var(--black);
  box-shadow: 0 0 10px var(--green-glow);
}

.typing-dots {
  display: flex;
  gap: 6px;
  align-items: center;
  padding: 8px 0;
}

.typing-dots span {
  width: 8px;
  height: 8px;
  background: var(--green);
  border-radius: 50%;
  display: inline-block;
  animation: matrix-pulse 1.2s infinite;
  box-shadow: 0 0 6px var(--green);
}

.typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes matrix-pulse {
  0%, 100% { opacity: 0.15; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1.15); }
}

/* =========================
   INPUT AREA
   ========================= */
.input-area {
  padding: 18px 36px;
  border-top: 1px solid var(--border);
  background: var(--black);
  flex-shrink: 0;
}

.input-wrapper {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  background: var(--green-tint);
  border: 1px solid var(--border);
  padding: 12px 14px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.input-wrapper:focus-within {
  border-color: var(--green);
  box-shadow: 0 0 12px var(--green-glow), 0 0 1px var(--green) inset;
}

.input-wrapper textarea {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--green);
  font-size: 0.88rem;
  font-family: var(--font);
  outline: none;
  resize: none;
  min-height: 24px;
  max-height: 160px;
  line-height: 1.6;
  caret-color: var(--green);
}

.input-wrapper textarea::placeholder {
  color: var(--text-ghost);
}

.send-btn {
  width: 38px;
  height: 38px;
  background: rgba(0, 255, 65, 0.1);
  border: 1px solid var(--border);
  color: var(--text-ghost);
  font-size: 1.1rem;
  cursor: not-allowed;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  font-family: var(--font);
  font-weight: 700;
  flex-shrink: 0;
}

.send-btn.active {
  background: var(--green);
  border-color: var(--green);
  color: var(--black);
  cursor: pointer;
  box-shadow: 0 0 12px var(--green-glow);
}

.send-btn.active:hover {
  background: var(--green-bright);
  box-shadow: 0 0 20px var(--green-glow-strong);
}

.input-disclaimer {
  margin-top: 10px;
  font-size: 0.68rem;
  color: var(--text-ghost);
  text-align: center;
  letter-spacing: 0.03em;
}

/* =========================
   RESPONSIVE — Tablet
   ========================= */
@media (max-width: 968px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 100;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-toggle {
    display: flex;
  }

  .chat-empty {
    justify-content: flex-start;
    padding-top: 72px;
  }

  .message-row { padding: 18px 20px; }
  .typing-row { padding: 18px 20px; }
  .input-area { padding: 14px 20px; }

  .suggestion-cards {
    max-width: 480px;
  }
}

/* =========================
   RESPONSIVE — Mobile
   ========================= */
@media (max-width: 640px) {
  .sidebar {
    width: 100%;
  }

  .message-row {
    padding: 14px 16px;
    gap: 10px;
  }

  .message-avatar {
    width: 30px;
    height: 30px;
    font-size: 0.75rem;
  }

  .message-text { font-size: 0.84rem; }
  .message-sender { font-size: 0.72rem; }

  .input-area { padding: 12px 14px; }
  .input-wrapper { padding: 10px 12px; }
  .input-wrapper textarea { font-size: 0.84rem; }

  .typing-row {
    padding: 14px 16px;
    gap: 10px;
  }

  .suggestion-cards {
    grid-template-columns: 1fr;
    background: transparent;
    gap: 8px;
  }

  .suggestion-card {
    border: 1px solid var(--border);
    padding: 14px;
  }

  .card-icon {
    width: 34px;
    height: 34px;
    font-size: 0.9rem;
  }

  .card-text strong { font-size: 0.8rem; }
  .card-text span { font-size: 0.72rem; }

  .chat-empty {
    padding: 72px 18px 28px;
  }

  .empty-logo {
    width: 64px;
    height: 64px;
    font-size: 1.8rem;
    margin-bottom: 18px;
  }

  .chat-empty h1 { font-size: 1.3rem; }
  .dev-notice { font-size: 0.78rem; }

  .send-btn {
    width: 34px;
    height: 34px;
    font-size: 1rem;
  }
}

@media (max-width: 380px) {
  .message-row {
    padding: 12px 12px;
    gap: 8px;
  }

  .message-avatar {
    width: 28px;
    height: 28px;
    font-size: 0.7rem;
  }

  .message-text { font-size: 0.8rem; }
  .input-wrapper textarea { font-size: 0.8rem; }
  .send-btn { width: 32px; height: 32px; }

  .suggestion-card { padding: 12px; }
  .card-icon { width: 30px; height: 30px; font-size: 0.82rem; }
  .card-text strong { font-size: 0.78rem; }

  .notice-badge { font-size: 0.68rem; padding: 4px 10px; }
}