:root {
  --bg-page:   #f8fafd;
  --bg-panel:  #ffffff;
  --bg-input:  #ffffff;
  --border:    #f0f0f0;
  --border-md: #d9d9d9;
  --text:      rgba(0,0,0,0.88);
  --text-dim:  rgba(0,0,0,0.45);
  --text-mid:  rgba(0,0,0,0.65);
  --accent:    #1677ff;
  --accent-bg: #e6f4ff;
  --success:   #52c41a;
  --warn:      #faad14;
  --error:     #ff4d4f;
  --pending:   #bfbfbf;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  font-family: "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 13px;
  background: var(--bg-page);
  color: var(--text);
  overflow: hidden;
}

/* ── Header ── */
header {
  height: 48px;
  display: flex;
  align-items: center;
  padding: 0 20px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

header h1 {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--accent);
}

/* ── Grid ── */
#grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  height: calc(100vh - 48px - 16px);
  margin: 8px;
  gap: 1px;
  background: var(--border);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0,0,0,0.07);
}

section {
  background: var(--bg-panel);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
}

/* ── Panel label ── */
.panel-label {
  height: 36px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-mid);
  padding: 0 14px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  background: #fafafa;
}

/* ── Player panel ── */
#player-container {
  position: relative;
  flex: 1;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
}

#ad-video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: none;
}

#ad-audio {
  width: calc(100% - 32px);
  display: none;
}

#banner-container {
  display: none;
  max-width: 100%;
  max-height: 100%;
  overflow: auto;
}

#player-overlay {
  position: absolute;
  inset: 0;
  cursor: pointer;
  pointer-events: none;
  z-index: 2;
}

#player-placeholder {
  color: rgba(255,255,255,0.35);
  font-size: 13px;
  text-align: center;
  padding: 24px;
}

#skip-btn {
  position: absolute;
  bottom: 52px;
  right: 12px;
  z-index: 3;
  background: rgba(0,0,0,0.65);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.3);
  padding: 5px 14px;
  font-size: 12px;
  cursor: pointer;
  border-radius: 3px;
}
#skip-btn:hover { background: rgba(0,0,0,0.85); }

#media-meta {
  padding: 5px 14px;
  font-size: 11px;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  min-height: 24px;
  flex-shrink: 0;
  background: #fafafa;
}

/* ── Input panel ── */
#input-panel { }

#input-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 14px;
  gap: 10px;
  min-height: 0;
  overflow: hidden;
}


#url-row {
  display: flex;
  gap: 8px;
}

#vast-url {
  flex: 1;
  background: var(--bg-input);
  border: 1px solid var(--border-md);
  border-radius: 6px;
  color: var(--text);
  padding: 7px 10px;
  font-size: 13px;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  outline: none;
  min-width: 0;
  transition: border-color 0.15s, box-shadow 0.15s;
}
#vast-url:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(22,119,255,0.1);
}
#vast-url::placeholder { color: var(--text-dim); }

button {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 7px 18px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s;
}
button:hover { background: #4096ff; }
button:active { background: #0958d9; }
button:disabled { opacity: 0.4; cursor: default; }

.small-btn {
  background: var(--bg-panel);
  color: var(--text-mid);
  border: 1px solid var(--border-md);
  padding: 3px 10px;
  font-size: 11px;
  font-weight: 500;
  border-radius: 4px;
  margin-left: auto;
}
.small-btn:hover { background: var(--accent-bg); color: var(--accent); border-color: var(--accent); }

#input-status {
  font-size: 12px;
  min-height: 18px;
  display: flex;
  align-items: center;
  gap: 8px;
}
#input-status.info    { color: var(--text-dim); }
#input-status.success { color: var(--success); }
#input-status.error   { color: var(--error); }
#input-status.loading { color: var(--accent); }

/* spinner */
.spinner {
  width: 12px;
  height: 12px;
  border: 2px solid var(--border-md);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}
@keyframes spin { to { transform: rotate(360deg); } }

#xml-details {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border-md);
  border-radius: 6px;
  overflow: hidden;
}

#xml-hop-label {
  font-size: 10px;
  color: var(--warn);
}

#xml-toolbar {
  display: flex;
  align-items: center;
  padding: 5px 10px 5px 12px;
  font-size: 11px;
  color: var(--text-mid);
  background: #fafafa;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

#xml-container {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  background: var(--bg-page);
}

#raw-xml {
  padding: 10px;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 11px;
  color: var(--text-mid);
  white-space: pre-wrap;
  word-break: break-all;
  margin: 0;
}

/* ── Log panel ── */
#event-log {
  flex: 1;
  overflow-y: auto;
  padding: 4px 0;
  list-style: none;
  display: flex;
  flex-direction: column-reverse;
}

#event-log li {
  padding: 3px 14px;
  display: flex;
  gap: 10px;
  align-items: baseline;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 11px;
  line-height: 1.6;
  border-bottom: 1px solid transparent;
}
#event-log li:hover { background: #f5f8ff; }

.log-ts    { color: var(--text-dim); flex-shrink: 0; }
.log-event { font-weight: 700; flex-shrink: 0; min-width: 110px; }
.log-detail { color: var(--text-dim); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

#event-log li[data-type="error"]         .log-event { color: var(--error); }
#event-log li[data-type="complete"]      .log-event { color: var(--success); }
#event-log li[data-type="impression"]    .log-event { color: var(--accent); }
#event-log li[data-type="start"]         .log-event { color: var(--accent); }
#event-log li[data-type="wrapper"]       .log-event { color: var(--warn); }
#event-log li[data-type="vast-loaded"]   .log-event { color: var(--success); }
#event-log li[data-type="no-ad"]         .log-event { color: var(--warn); }
#event-log li[data-type="click"]         .log-event { color: #1677ff; }
#event-log li[data-type="skip"]          .log-event { color: var(--warn); }
#event-log li[data-type="firstQuartile"]  .log-event,
#event-log li[data-type="midpoint"]       .log-event,
#event-log li[data-type="thirdQuartile"]  .log-event { color: #389e0d; }

/* ── Diagram panel ── */
#diagram-container {
  flex: 1;
  overflow-y: auto;
  padding: 14px;
  min-height: 0;
}

#diagram-tree {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 12px;
  line-height: 1.75;
  white-space: pre;
  margin: 0;
  color: var(--text);
}

.diag-square {
  display: inline-block;
  width: 1.1em;
  text-align: center;
}
.diag-node--pending { color: var(--pending); }
.diag-node--fired   { color: var(--success); }
.diag-node--error   { color: var(--error); }

.diag-url  { color: var(--text-dim); font-size: 10px; }
.diag-info { color: var(--accent); font-weight: 500; }
.diag-warn { color: var(--warn); }

/* ── Responsive ── */
@media (max-width: 900px) {
  html, body { overflow: auto; }
  #grid {
    grid-template-columns: 1fr;
    grid-template-rows: repeat(4, minmax(280px, auto));
    height: auto;
  }
  #input-panel { min-height: 200px; }
}