static/css/style.css

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

:root {
  --bg:        #0a0a0f;
  --surface:   #111118;
  --surface2:  #1a1a24;
  --border:    #2a2a3a;
  --accent:    #7c6aff;
  --accent2:   #ff6a9b;
  --text:      #e8e8f0;
  --text-muted:#7a7a9a;
  --ai-bg:     #13131e;
  --user-bg:   #1e1630;
  --radius:    14px;
  --font-ui:   'Syne', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  overflow: hidden;
}

/* ── Background Grid ──────────────────────────── */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.25;
  pointer-events: none;
  z-index: 0;
}

/* ── App Layout ───────────────────────────────── */
.app-wrapper {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 780px;
  margin: 0 auto;
}

/* ── Header ───────────────────────────────────── */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 28px;
  border-bottom: 1px solid var(--border);
  background: rgba(10,10,15,0.85);
  backdrop-filter: blur(12px);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo-mark {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.logo-dot {
  display: block;
  width: 20px;
  height: 4px;
  border-radius: 2px;
  background: var(--accent);
}
.logo-dot:nth-child(2) { width: 14px; background: var(--accent2); }
.logo-dot:nth-child(3) { width: 8px; opacity: 0.5; }

.header-title {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1;
}

.header-sub {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  margin-top: 3px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.status-badge {
  display: flex;
  align-items: center;
  gap: 7px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 6px 14px;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #4ade80;
  box-shadow: 0 0 8px #4ade80;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

.status-text {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ── Chat Container ───────────────────────────── */
.chat-container {
  flex: 1;
  overflow-y: auto;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  scroll-behavior: smooth;
}

.chat-container::-webkit-scrollbar { width: 4px; }
.chat-container::-webkit-scrollbar-track { background: transparent; }
.chat-container::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

/* ── Messages ─────────────────────────────────── */
.message {
  display: flex;
  gap: 12px;
  animation: fadeUp 0.3s ease forwards;
  opacity: 0;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.msg-avatar {
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.ai-message .msg-avatar {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
}

.user-message {
  flex-direction: row-reverse;
}

.user-message .msg-avatar {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.msg-body {
  max-width: 75%;
  padding: 13px 17px;
  border-radius: var(--radius);
  font-size: 0.92rem;
  line-height: 1.65;
}

.ai-message .msg-body {
  background: var(--ai-bg);
  border: 1px solid var(--border);
  border-top-left-radius: 4px;
}

.user-message .msg-body {
  background: var(--user-bg);
  border: 1px solid rgba(124,106,255,0.25);
  border-top-right-radius: 4px;
  color: #ccc8f8;
}

/* ── Typing Indicator ─────────────────────────── */
.typing-indicator .msg-body {
  padding: 14px 18px;
}

.dots {
  display: flex;
  gap: 5px;
  align-items: center;
  height: 18px;
}

.dots span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: bounce 1.2s ease-in-out infinite;
}
.dots span:nth-child(2) { animation-delay: 0.2s; background: var(--accent2); }
.dots span:nth-child(3) { animation-delay: 0.4s; opacity: 0.6; }

@keyframes bounce {
  0%, 60%, 100% { transform: translateY(0); }
  30%           { transform: translateY(-6px); }
}

/* ── Input Area ───────────────────────────────── */
.input-area {
  padding: 16px 24px 20px;
  border-top: 1px solid var(--border);
  background: rgba(10,10,15,0.9);
  backdrop-filter: blur(12px);
}

.input-wrapper {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 10px 10px 16px;
  transition: border-color 0.2s;
}

.input-wrapper:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(124,106,255,0.12);
}

.chat-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 0.93rem;
  line-height: 1.5;
  resize: none;
  max-height: 140px;
  overflow-y: auto;
}

.chat-input::placeholder { color: var(--text-muted); }

.send-btn {
  flex-shrink: 0;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: none;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, transform 0.1s;
}

.send-btn:hover  { background: #9180ff; }
.send-btn:active { transform: scale(0.93); }
.send-btn:disabled {
  background: var(--border);
  cursor: not-allowed;
  opacity: 0.6;
}

.footer-note {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 10px;
  letter-spacing: 0.03em;
}