/* ═══════════════════════════════════════════════════════════════
   style.css — AI File Converter Premium Dark UI
   ═══════════════════════════════════════════════════════════════ */

/* ── Design Tokens ────────────────────────────────────────────── */
:root {
  --bg:            #080c14;
  --bg-2:          #0d1220;
  --bg-3:          #111827;
  --surface:       rgba(255,255,255,0.04);
  --surface-hover: rgba(255,255,255,0.07);
  --border:        rgba(255,255,255,0.08);
  --border-hover:  rgba(255,255,255,0.18);

  --accent:        #6c63ff;
  --accent-2:      #a78bfa;
  --accent-glow:   rgba(108,99,255,0.35);
  --green:         #22c55e;
  --red:           #ef4444;
  --yellow:        #f59e0b;

  --text-primary:  #f1f5f9;
  --text-secondary:#94a3b8;
  --text-muted:    #475569;

  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --radius-xl:  28px;

  --sidebar-w: 280px;
  --font: 'Inter', sans-serif;
  --transition: 0.2s cubic-bezier(0.4,0,0.2,1);
}

/* ── Reset ────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
}
ol, ul { padding-left: 1.2rem; }

/* ── Background orbs ──────────────────────────────────────────── */
.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
  animation: orbFloat 12s ease-in-out infinite alternate;
}
.orb-1 { width: 500px; height: 500px; background: rgba(108,99,255,0.12); top: -120px; left: -100px; }
.orb-2 { width: 400px; height: 400px; background: rgba(167,139,250,0.08); bottom: -80px; right: -80px; animation-delay: -4s; }
.orb-3 { width: 300px; height: 300px; background: rgba(34,197,94,0.06); top: 50%; left: 50%; transform: translate(-50%,-50%); animation-delay: -8s; }

@keyframes orbFloat {
  from { transform: translate(0,0) scale(1); }
  to   { transform: translate(20px,30px) scale(1.08); }
}

/* ── App Shell ────────────────────────────────────────────────── */
.app-shell {
  display: flex;
  height: 100vh;
  position: relative;
  z-index: 1;
}

/* ── Sidebar ──────────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  background: var(--bg-2);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0;
  flex-shrink: 0;
  overflow-y: auto;
  transition: width var(--transition);
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 18px 16px;
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  box-shadow: 0 0 16px var(--accent-glow);
}
.logo-text {
  font-size: 18px; font-weight: 700;
  background: linear-gradient(135deg, #fff 40%, var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.sidebar-toggle {
  background: none; border: none; color: var(--text-secondary);
  font-size: 18px; cursor: pointer; padding: 4px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.sidebar-toggle:hover { color: var(--text-primary); background: var(--surface-hover); }

.sidebar-section {
  padding: 18px;
  border-bottom: 1px solid var(--border);
}
.sidebar-label {
  font-size: 10px; font-weight: 600; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--text-muted);
  margin-bottom: 12px;
}

/* Format list */
.format-list { display: flex; flex-direction: column; gap: 10px; }
.format-item { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.arrow { color: var(--text-muted); font-size: 12px; }
.format-tags { display: flex; gap: 4px; flex-wrap: wrap; }
.format-badge {
  font-size: 10px; font-weight: 600; padding: 3px 7px;
  border-radius: 4px; text-transform: uppercase; letter-spacing: 0.05em;
}
.format-badge.input  { background: rgba(108,99,255,0.15); color: var(--accent-2); border: 1px solid rgba(108,99,255,0.3); }
.format-badge.output { background: rgba(34,197,94,0.1); color: #4ade80; border: 1px solid rgba(34,197,94,0.25); }

/* Status */
.status-section { flex: 1; }
.status-items { display: flex; flex-direction: column; gap: 10px; }
.status-item { display: flex; align-items: center; gap: 8px; font-size: 13px; }
.status-name { color: var(--text-secondary); flex: 1; }
.status-val  { color: var(--text-muted); font-size: 11px; }
.status-dot {
  width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0;
}
.status-dot.ok       { background: var(--green); box-shadow: 0 0 6px var(--green); }
.status-dot.error    { background: var(--red); }
.status-dot.checking { background: var(--yellow); animation: pulse 1.4s infinite; }

@keyframes pulse {
  0%,100% { opacity: 1; } 50% { opacity: 0.3; }
}

.sidebar-footer {
  padding: 16px 18px;
  font-size: 11px; color: var(--text-muted);
  text-align: center;
  border-top: 1px solid var(--border);
  margin-top: auto;
}

/* ── Main ─────────────────────────────────────────────────────── */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

.main-header {
  padding: 24px 32px 16px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(108,99,255,0.05) 0%, transparent 100%);
}
.main-title {
  font-size: 22px; font-weight: 700;
  background: linear-gradient(135deg, #fff 30%, var(--accent-2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.main-subtitle { font-size: 13px; color: var(--text-secondary); margin-top: 4px; }

/* ── Chat window ──────────────────────────────────────────────── */
.chat-window {
  flex: 1;
  overflow-y: auto;
  padding: 24px 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  scroll-behavior: smooth;
}
.chat-window::-webkit-scrollbar { width: 4px; }
.chat-window::-webkit-scrollbar-track { background: transparent; }
.chat-window::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* ── Messages ─────────────────────────────────────────────────── */
.message {
  display: flex;
  gap: 12px;
  animation: msgIn 0.3s cubic-bezier(0.34,1.56,0.64,1) both;
}
.message.user { flex-direction: row-reverse; }

@keyframes msgIn {
  from { opacity: 0; transform: translateY(16px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.message-avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 16px; flex-shrink: 0;
}
.message.user .message-avatar {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-color: transparent;
}

.message-body { display: flex; flex-direction: column; gap: 4px; max-width: 70%; }
.message.user .message-body { align-items: flex-end; }

.message-bubble {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 14px 18px;
  font-size: 14px; line-height: 1.6;
  color: var(--text-primary);
  backdrop-filter: blur(8px);
}
.message.user .message-bubble {
  background: linear-gradient(135deg, rgba(108,99,255,0.25), rgba(167,139,250,0.15));
  border-color: rgba(108,99,255,0.35);
}

.message-time {
  font-size: 10px; color: var(--text-muted);
  padding: 0 4px;
}

/* Welcome message specifics */
.welcome-steps { margin: 10px 0; display: flex; flex-direction: column; gap: 6px; font-size: 13px; }
.welcome-example { font-size: 12px; color: var(--text-secondary); margin-top: 10px; }
.welcome-example em { color: var(--accent-2); font-style: normal; }

/* Loading bubble */
.loading-bubble {
  display: flex; align-items: center; gap: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 14px 18px;
  backdrop-filter: blur(8px);
}
.spinner {
  width: 18px; height: 18px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { font-size: 13px; color: var(--text-secondary); }

/* Success bubble */
.success-bubble {
  background: rgba(34,197,94,0.08);
  border: 1px solid rgba(34,197,94,0.25);
  border-radius: var(--radius-lg);
  padding: 14px 18px;
  display: flex; flex-direction: column; gap: 10px;
}
.success-text { font-size: 13px; color: var(--text-primary); }
.download-btn {
  display: inline-flex; align-items: center; gap: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff; border: none; cursor: pointer;
  padding: 10px 20px; border-radius: var(--radius-md);
  font-size: 13px; font-weight: 600; font-family: var(--font);
  text-decoration: none; width: fit-content;
  box-shadow: 0 4px 16px var(--accent-glow);
  transition: transform var(--transition), box-shadow var(--transition);
}
.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

/* Error bubble */
.error-bubble {
  background: rgba(239,68,68,0.08);
  border: 1px solid rgba(239,68,68,0.25);
  border-radius: var(--radius-lg);
  padding: 14px 18px;
  font-size: 13px; color: #fca5a5;
}
.error-label { font-weight: 600; color: var(--red); margin-bottom: 4px; }

/* ── Input area ───────────────────────────────────────────────── */
.input-area {
  padding: 16px 32px 24px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: linear-gradient(0deg, rgba(108,99,255,0.04) 0%, transparent 100%);
}

/* Upload zone */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 18px 24px;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  position: relative;
  background: var(--surface);
}
.upload-zone:hover, .upload-zone.dragover {
  border-color: var(--accent);
  background: rgba(108,99,255,0.06);
}
.upload-zone:focus { outline: none; border-color: var(--accent); }

.upload-idle { display: flex; flex-direction: column; align-items: center; gap: 6px; text-align: center; }
.upload-icon { font-size: 28px; }
.upload-text  { font-size: 13px; color: var(--text-secondary); }
.upload-link  { color: var(--accent-2); text-decoration: underline; }
.upload-hint  { font-size: 11px; color: var(--text-muted); }

.file-preview {
  display: flex; align-items: center; gap: 12px;
}
.file-icon-large { font-size: 32px; }
.file-info { flex: 1; min-width: 0; }
.file-name { font-size: 14px; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.file-meta { font-size: 11px; color: var(--text-muted); margin-top: 2px; }
.file-remove {
  background: rgba(239,68,68,0.12); border: 1px solid rgba(239,68,68,0.2);
  color: var(--red); border-radius: 50%; width: 26px; height: 26px;
  font-size: 11px; cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: background var(--transition);
}
.file-remove:hover { background: rgba(239,68,68,0.25); }

/* Command row */
.command-row {
  display: flex;
  gap: 10px;
}
.command-input {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 14px;
  padding: 12px 16px;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.command-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.command-input::placeholder { color: var(--text-muted); }

.send-btn {
  display: flex; align-items: center; gap: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff; border: none; cursor: pointer;
  padding: 12px 22px; border-radius: var(--radius-md);
  font-size: 14px; font-weight: 600; font-family: var(--font);
  box-shadow: 0 4px 16px var(--accent-glow);
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  white-space: nowrap;
}
.send-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px var(--accent-glow);
}
.send-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

/* ── Utility ──────────────────────────────────────────────────── */
.hidden { display: none !important; }

/* ── Responsive ───────────────────────────────────────────────── */
@media (max-width: 768px) {
  .sidebar { display: none; }
  .main-header { padding: 16px; }
  .chat-window { padding: 16px; }
  .input-area { padding: 12px 16px 20px; }
  .message-body { max-width: 90%; }
}