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

:root {
  --bg: #f8f7f4;
  --surface: #ffffff;
  --border: #e2e0db;
  --text: #2c2c2c;
  --text-muted: #7a7a7a;
  --accent: #4a6fa5;
  --accent-light: #e8eff8;
  --danger: #c0392b;
  --success: #27ae60;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.08);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}

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

/* ===== Top Bar ===== */
.top-bar {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 0.75rem 2rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

nav { display: flex; gap: 0.25rem; }

.tab {
  padding: 0.5rem 1rem;
  border: none;
  background: transparent;
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius);
  transition: all 0.15s;
}
.tab:hover { background: var(--accent-light); color: var(--accent); }
.tab.active { background: var(--accent); color: #fff; }

/* ===== Main Layout ===== */
main {
  max-width: 960px;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.panel-header { margin-bottom: 1.5rem; }
.panel-header h2 { font-size: 1.5rem; font-weight: 700; letter-spacing: -0.02em; }
.panel-header .subtitle { color: var(--text-muted); font-size: 0.9rem; margin-top: 0.25rem; }

/* ===== Forms ===== */
.parser-grid { display: flex; flex-direction: column; gap: 1rem; }

.input-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

textarea, input[type="text"] {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 0.95rem;
  background: var(--surface);
  resize: vertical;
  transition: border-color 0.15s;
}
textarea:focus, input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1.5rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
  align-self: flex-start;
}
.btn-primary:hover { background: #3b5d8e; }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-secondary {
  padding: 0.4rem 0.8rem;
  background: var(--accent-light);
  color: var(--accent);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}
.btn-secondary:hover { background: var(--accent); color: #fff; }

.status-msg {
  padding: 0.6rem 1rem;
  border-radius: var(--radius);
  font-size: 0.85rem;
}
.status-msg.hidden { display: none; }
.status-msg.info { background: var(--accent-light); color: var(--accent); }
.status-msg.error { background: #fdecea; color: var(--danger); }
.status-msg.success { background: #e8f8ef; color: var(--success); }

.empty-state {
  text-align: center;
  padding: 3rem;
  color: var(--text-muted);
  font-style: italic;
}

/* ===== Scene Cards ===== */
.scene-list { display: flex; flex-direction: column; gap: 1.5rem; }

.scene-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.scene-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1.25rem;
  background: var(--accent-light);
  border-bottom: 1px solid var(--border);
}
.scene-card-header h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent);
}

.scene-card-body { padding: 1.25rem; display: flex; flex-direction: column; gap: 1rem; }

/* Upload slots */
.upload-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.upload-slot {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  position: relative;
}
.upload-slot:hover { border-color: var(--accent); background: var(--accent-light); }
.upload-slot .slot-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}
.upload-slot .slot-icon { font-size: 1.5rem; margin-bottom: 0.25rem; }
.upload-slot input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}
.upload-slot.has-file { border-color: var(--success); background: #e8f8ef; }
.upload-slot .file-name {
  font-size: 0.8rem;
  color: var(--success);
  font-weight: 500;
  word-break: break-all;
}

/* Keywords */
.keywords-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}
.keyword-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.6rem;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
}
.keyword-tag .remove-kw {
  cursor: pointer;
  font-size: 0.7rem;
  opacity: 0.6;
}
.keyword-tag .remove-kw:hover { opacity: 1; }

.add-keyword-input {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
  font-size: 0.8rem;
  width: 120px;
}

/* Target sentence interactive */
.target-sentence-area {
  background: #fafaf8;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}
.target-sentence-area .area-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}
.target-sentence-area .hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  font-style: italic;
}

.word-tokens {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  line-height: 2;
}
.word-token {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.15s;
  user-select: none;
  border: 1px solid transparent;
}
.word-token:hover { background: var(--accent-light); border-color: var(--accent); }
.word-token.masked {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* Connector dropdown */
.connector-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.connector-row label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}
.connector-row select {
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 0.9rem;
  background: var(--surface);
}

/* Editable text input for target sentence */
.target-edit-input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
}

/* ===== JSON Preview ===== */
.json-preview {
  background: #1e1e2e;
  color: #cdd6f4;
  padding: 1.5rem;
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 0.8rem;
  overflow-x: auto;
  max-height: 500px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-word;
  margin-bottom: 1rem;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .upload-row { grid-template-columns: 1fr; }
  .top-bar { flex-direction: column; gap: 0.5rem; padding: 0.75rem 1rem; }
  main { padding: 0 1rem; }
}