/* ============================================================
   UVM Template Generator — EDA Workbench Theme
   ============================================================ */

:root {
  /* Core palette */
  --bg-primary:    #0d1117;
  --bg-secondary:  #161b22;
  --bg-tertiary:   #1c2129;
  --bg-elevated:   #21262d;
  --border:        #30363d;
  --border-light:  #3d444d;

  /* Text */
  --text-primary:   #e6edf3;
  --text-secondary: #8b949e;
  --text-muted:     #6e7681;

  /* Accents */
  --cyan:    #00d4ff;
  --cyan-dim:#00a0c0;
  --amber:   #ffb000;
  --amber-dim:#c08500;
  --green:   #00ff88;
  --green-dim:#00c068;
  --red:     #ff5555;

  /* Syntax highlighting */
  --syn-keyword:  #ff7b72;
  --syn-type:     #79c0ff;
  --syn-string:   #a5d6ff;
  --syn-comment:  #6e7681;
  --syn-macro:    #d2a8ff;
  --syn-number:   #79c0ff;
  --syn-function: #d2a8ff;

  /* Fonts */
  --font-ui:   'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  /* Layout */
  --header-height: 48px;
  --tab-height: 40px;
}

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

html, body {
  height: 100%;
  overflow: hidden;
  font-family: var(--font-ui);
  font-size: 14px;
  color: var(--text-primary);
  background: var(--bg-primary);
}

/* Subtle dot-grid texture */
body {
  background-image: radial-gradient(circle, #ffffff06 1px, transparent 1px);
  background-size: 20px 20px;
}

/* ── Header ────────────────────────────────────────────────── */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.header-icon {
  font-size: 20px;
  color: var(--cyan);
}

.header h1 {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.btn:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-light);
}

.btn-action {
  background: var(--green-dim);
  border-color: var(--green-dim);
  color: #000;
  font-weight: 600;
}

.btn-action:hover {
  background: var(--green);
  border-color: var(--green);
}

.btn-accent {
  color: var(--cyan);
  border-color: var(--cyan-dim);
}

.btn-accent:hover {
  background: rgba(0, 212, 255, 0.1);
}

.btn-outline {
  color: var(--text-secondary);
  border-color: var(--border);
}

.btn-outline:hover {
  color: var(--text-primary);
  border-color: var(--border-light);
}

.btn-small {
  padding: 4px 10px;
  font-size: 12px;
}

.btn-danger {
  color: var(--red);
  border-color: transparent;
  background: transparent;
  padding: 2px 6px;
  font-size: 16px;
  line-height: 1;
}

.btn-danger:hover {
  background: rgba(255, 85, 85, 0.15);
}

/* ── Split Pane ────────────────────────────────────────────── */
.split-pane {
  display: flex;
  height: calc(100vh - var(--header-height));
  overflow: hidden;
}

.panel {
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.panel-left {
  width: 35%;
  min-width: 280px;
  max-width: 60%;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
}

.panel-right {
  flex: 1;
  min-width: 300px;
  background: var(--bg-primary);
}

.panel-scroll {
  overflow-y: auto;
  flex: 1;
  padding: 12px;
}

.panel-scroll::-webkit-scrollbar { width: 8px; }
.panel-scroll::-webkit-scrollbar-track { background: transparent; }
.panel-scroll::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}
.panel-scroll::-webkit-scrollbar-thumb:hover {
  background: var(--border-light);
}

/* ── Drag Handle ───────────────────────────────────────────── */
.drag-handle {
  width: 5px;
  cursor: col-resize;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.15s;
}

.drag-handle:hover,
.drag-handle.active {
  background: var(--cyan-dim);
}

.drag-handle-line {
  width: 1px;
  height: 30px;
  background: var(--border-light);
  border-radius: 1px;
}

/* ── Config Sections ───────────────────────────────────────── */
.config-section {
  margin-bottom: 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--bg-tertiary);
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 10px 14px;
  border: none;
  background: none;
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  transition: background 0.15s;
}

.section-header:hover {
  background: rgba(255, 255, 255, 0.03);
}

.section-chevron {
  font-size: 12px;
  color: var(--text-muted);
  transition: transform 0.2s ease;
}

.section-header[aria-expanded="false"] .section-chevron {
  transform: rotate(-90deg);
}

.section-body {
  padding: 0 14px 14px;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease, opacity 0.2s ease;
}

.section-body.collapsed {
  max-height: 0 !important;
  padding-top: 0;
  padding-bottom: 0;
  opacity: 0;
  pointer-events: none;
}

/* ── Form Elements ─────────────────────────────────────────── */
.form-group {
  margin-bottom: 12px;
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-group label {
  display: block;
  margin-bottom: 4px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-group-inline label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-primary);
  cursor: pointer;
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group select {
  width: 100%;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 13px;
  outline: none;
  transition: border-color 0.15s;
}

.form-group input:focus,
.form-group select:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 2px rgba(0, 212, 255, 0.15);
}

.form-group select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%238b949e'%3E%3Cpath d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 28px;
}

.form-hint {
  display: block;
  margin-top: 3px;
  font-size: 11px;
  color: var(--text-muted);
}

.form-hint code {
  font-family: var(--font-mono);
  color: var(--cyan);
  font-size: 11px;
}

input[type="checkbox"] {
  accent-color: var(--cyan);
  width: 15px;
  height: 15px;
  cursor: pointer;
}

/* ── Signal Table ──────────────────────────────────────────── */
.signal-table-wrapper {
  overflow-x: auto;
  margin-bottom: 10px;
}

.signal-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

.signal-table th {
  padding: 6px 6px;
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.signal-table td {
  padding: 4px 4px;
  vertical-align: middle;
  border-bottom: 1px solid var(--border);
}

.signal-table input[type="text"],
.signal-table input[type="number"] {
  width: 100%;
  padding: 4px 6px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 12px;
  outline: none;
}

.signal-table input[type="text"] { min-width: 70px; }
.signal-table input[type="number"] { width: 55px; }

.signal-table select {
  padding: 4px 6px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 12px;
  outline: none;
  cursor: pointer;
}

.signal-table input:focus,
.signal-table select:focus {
  border-color: var(--cyan);
}

.signal-table input[type="radio"] {
  accent-color: var(--amber);
  cursor: pointer;
}

.signal-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

/* Reset options inline */
.reset-opts {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: 4px;
  font-size: 11px;
  color: var(--text-secondary);
}

.reset-opts label {
  display: flex;
  align-items: center;
  gap: 3px;
  cursor: pointer;
  white-space: nowrap;
}

.reset-opts input[type="checkbox"] {
  width: 13px;
  height: 13px;
}

/* ── Tab Bar ───────────────────────────────────────────────── */
.tab-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  padding: 8px 10px 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  min-height: var(--tab-height);
  align-items: flex-end;
  overflow-x: auto;
}

.tab-bar::-webkit-scrollbar { height: 3px; }
.tab-bar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.tab-group {
  display: flex;
  align-items: flex-end;
  gap: 1px;
  margin-right: 2px;
  position: relative;
  padding: 0 2px;
  border-radius: 6px 6px 0 0;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border);
  border-bottom: none;
  margin-bottom: -1px;
}

.tab-group-label {
  font-size: 9px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--cyan-dim);
  padding: 5px 6px 0;
  align-self: flex-start;
  white-space: nowrap;
  border-right: 1px solid var(--border);
  margin-right: 2px;
  line-height: 2.2;
}

.tab-btn {
  padding: 5px 8px;
  border: none;
  border-radius: 4px 4px 0 0;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 11px;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s;
  border: 1px solid transparent;
  border-bottom: none;
  margin-bottom: 0;
}

.tab-btn:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.tab-btn.active {
  background: var(--bg-primary);
  color: var(--amber);
  border-color: var(--border);
  font-weight: 500;
}

/* ── Code Display ──────────────────────────────────────────── */
.code-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.code-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.code-filename {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--amber);
  font-weight: 500;
}

.code-display {
  flex: 1;
  margin: 0;
  padding: 16px;
  overflow: auto;
  background: var(--bg-primary);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  tab-size: 2;
  color: var(--text-primary);
}

.code-display::-webkit-scrollbar { width: 8px; height: 8px; }
.code-display::-webkit-scrollbar-track { background: transparent; }
.code-display::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

.code-display code {
  font-family: inherit;
  font-size: inherit;
}

/* ── Syntax Highlighting ───────────────────────────────────── */
.syn-kw   { color: var(--syn-keyword); font-weight: 500; }
.syn-type { color: var(--syn-type); }
.syn-str  { color: var(--syn-string); }
.syn-cmt  { color: var(--syn-comment); font-style: italic; }
.syn-mac  { color: var(--syn-macro); }
.syn-num  { color: var(--syn-number); }
.syn-fn   { color: var(--syn-function); }

/* ── Toast ─────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  padding: 8px 20px;
  border-radius: 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--green-dim);
  color: var(--green);
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 500;
  opacity: 0;
  transition: all 0.3s ease;
  pointer-events: none;
  z-index: 1000;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── Theme Toggle Button ───────────────────────────────────── */
.btn-icon {
  padding: 6px 8px;
  line-height: 0;
}

/* ── Light Theme ───────────────────────────────────────────── */
html.light {
  /* Core palette */
  --bg-primary:    #ffffff;
  --bg-secondary:  #f6f8fa;
  --bg-tertiary:   #eef1f5;
  --bg-elevated:   #e8ecf0;
  --border:        #d0d7de;
  --border-light:  #bbc1c8;

  /* Text */
  --text-primary:   #1f2328;
  --text-secondary: #59636e;
  --text-muted:     #8b949e;

  /* Accents — slightly deeper for light-bg contrast */
  --cyan:     #0078a8;
  --cyan-dim: #0a6d94;
  --amber:    #b35900;
  --amber-dim:#9a4e00;
  --green:    #1a7f37;
  --green-dim:#116329;
  --red:      #cf222e;

  /* Syntax — light-friendly palette */
  --syn-keyword:  #cf222e;
  --syn-type:     #0550ae;
  --syn-string:   #0a3069;
  --syn-comment:  #6e7781;
  --syn-macro:    #8250df;
  --syn-number:   #0550ae;
  --syn-function: #8250df;
}

html.light body {
  background-image: radial-gradient(circle, #00000008 1px, transparent 1px);
}

html.light .drag-handle:hover,
html.light .drag-handle.active {
  background: var(--cyan);
}

html.light .btn-action {
  color: #fff;
}

html.light .toast {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
}

html.light .form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2359636e'%3E%3Cpath d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 768px) {
  .split-pane {
    flex-direction: column;
  }

  .panel-left {
    width: 100% !important;
    max-width: 100%;
    min-width: 0;
    height: 45vh;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .drag-handle {
    display: none;
  }

  .panel-right {
    min-width: 0;
  }

  .tab-bar {
    flex-wrap: nowrap;
  }
}