/* Neptune — neptune.srscholar.com */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #0f1117;
  --surface:   #1a1d27;
  --border:    #2a2d3a;
  --accent:    #4f8ef7;
  --accent2:   #7c5cbf;
  --text:      #e2e8f0;
  --muted:     #8892a4;
  --success:   #34d399;
  --error:     #f87171;
  --warning:   #fbbf24;
  --radius:    8px;
  --font:      'Inter', system-ui, sans-serif;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.6;
  min-height: 100vh;
}

/* ── Upload Page ── */
.upload-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 2rem;
}

.logo {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.25rem;
  letter-spacing: -0.5px;
}
.logo span { color: var(--text); }
.tagline { color: var(--muted); margin-bottom: 2.5rem; font-size: 0.85rem; }

.upload-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem;
  width: 100%;
  max-width: 520px;
}

.upload-card h2 { font-size: 1.1rem; margin-bottom: 1.5rem; color: var(--text); }

.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  margin-bottom: 1.5rem;
}
.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--accent);
  background: rgba(79,142,247,0.05);
}
.drop-zone .icon { font-size: 2.5rem; margin-bottom: 0.75rem; }
.drop-zone p { color: var(--muted); font-size: 0.85rem; }
.drop-zone strong { color: var(--accent); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius);
  border: none;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.15s;
  text-decoration: none;
}
.btn:hover { opacity: 0.85; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-success { background: var(--success); color: #000; }
.btn-outline  {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-full { width: 100%; justify-content: center; }

/* Progress */
.progress-bar {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin-top: 1rem;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--accent);
  transition: width 0.3s;
  width: 0%;
}

/* Status badge */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.65rem;
  border-radius: 99px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}
.badge-ready     { background: rgba(52,211,153,0.15); color: var(--success); }
.badge-compiling { background: rgba(251,191,36,0.15);  color: var(--warning); }
.badge-error     { background: rgba(248,113,113,0.15); color: var(--error); }
.badge-compiled  { background: rgba(79,142,247,0.15);  color: var(--accent); }

/* ── Editor Page ── */
.editor-layout {
  display: grid;
  grid-template-columns: 260px 1fr 1fr;
  height: 100vh;
  overflow: hidden;
}

.panel {
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.panel:last-child { border-right: none; }

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--muted);
  flex-shrink: 0;
}

.panel-body { flex: 1; overflow-y: auto; padding: 1rem; }

/* Sidebar */
.sidebar { background: var(--surface); }
.sidebar .paper-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.form-group { margin-bottom: 1.25rem; }
.form-group label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.4rem;
}
.form-control {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-family: var(--font);
  transition: border-color 0.15s;
}
.form-control:focus {
  outline: none;
  border-color: var(--accent);
}
textarea.form-control { resize: vertical; min-height: 80px; }

/* Author rows */
.author-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 0.5rem;
}
.author-row .form-control { flex: 1; }
.btn-icon {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  width: 30px;
  height: 30px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.btn-icon:hover { border-color: var(--error); color: var(--error); }

/* Center panel — Monaco */
.editor-panel { background: #1e1e1e; }
#monaco-editor { flex: 1; width: 100%; }

/* Preview panel */
.preview-panel { background: var(--bg); }
#pdf-frame {
  width: 100%;
  flex: 1;
  border: none;
  background: #fff;
}

/* Compile bar */
.compile-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 1rem;
  border-top: 1px solid var(--border);
  background: var(--surface);
  flex-shrink: 0;
}
.compile-status { font-size: 0.8rem; color: var(--muted); flex: 1; }

/* Toast */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.toast {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1.25rem;
  font-size: 0.85rem;
  min-width: 260px;
  animation: slideIn 0.2s ease;
}
.toast.success { border-color: var(--success); }
.toast.error   { border-color: var(--error); }
@keyframes slideIn {
  from { transform: translateX(20px); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}

/* Log panel */
.log-box {
  background: #0a0a0a;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem;
  font-family: 'Fira Code', monospace;
  font-size: 0.75rem;
  color: #9ca3af;
  max-height: 180px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-all;
  margin-top: 0.5rem;
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* Alert */
.alert {
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  font-size: 0.85rem;
  margin-bottom: 1rem;
}
.alert-error   { background: rgba(248,113,113,0.1); border: 1px solid var(--error); color: var(--error); }
.alert-success { background: rgba(52,211,153,0.1);  border: 1px solid var(--success); color: var(--success); }
.alert-info    { background: rgba(79,142,247,0.1);   border: 1px solid var(--accent); color: var(--accent); }