:root {
  --background-color: #f4f7f9;
  --text-color: #1a202c;
  --subtle-text-color: #718096;
  --primary-color: #4299e1;
  --primary-color-dark: #2b6cb0;
  --accent-color: #4fd1c5;
  --border-color: #e2e8f0;
  --surface-color: #ffffff;
  --shadow-color: rgba(0, 0, 0, 0.05);
  --highlight-bg: #ebf8ff;
  --highlight-color: var(--primary-color-dark);
  --danger-color: #e53e3e;

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --border-radius-lg: 0.75rem;
  --border-radius-md: 0.5rem;
  --border-radius-sm: 0.25rem;
  --shadow-sm: 0 1px 2px 0 var(--shadow-color);
  --shadow-md: 0 4px 6px -1px var(--shadow-color), 0 2px 4px -1px var(--shadow-color);
  --shadow-lg: 0 10px 15px -3px var(--shadow-color), 0 4px 6px -2px var(--shadow-color);
  --transition-speed: 0.2s;
}

/* --- Base & Typography --- */
body {
  font-family: var(--font-family);
  background-color: var(--background-color);
  color: var(--text-color);
  margin: 0;
  line-height: 1.6;
}

h1, h2, h3 {
  font-weight: 600;
  color: var(--text-color);
}

/* --- Header --- */
.app-header {
  background: white;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.app-header .logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.app-header .logo svg {
  width: 2rem;
  height: 2rem;
  color: var(--primary-color);
}
.app-header h1 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
}
.app-header p {
  margin: 0;
  color: var(--subtle-text-color);
  font-size: 1rem;
}

/* --- Main Layout --- */
main {
  padding: 2rem;
}
.log-analyzer-container {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
}
.log-analyzer-wrapper {
  flex: 3;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* --- Controls & Inputs --- */
.controls {
  background: var(--surface-color);
  border-radius: var(--border-radius-lg);
  padding: 1.5rem;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.input-group label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.5rem;
}
.log-input, .search-bar {
  width: 100%;
  background-color: var(--background-color);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 0.75rem 1rem;
  font-family: 'Menlo', 'Consolas', monospace;
  font-size: 0.9rem;
  box-sizing: border-box;
  transition: all var(--transition-speed) ease-in-out;
}
.log-input:focus, .search-bar:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.3);
}
.log-input {
  resize: vertical;
  min-height: 120px;
}
.search-wrapper {
  position: relative;
}
.search-bar {
  padding-right: 2.5rem;
}
.search-icon {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  width: 1.25rem;
  height: 1.25rem;
  color: var(--subtle-text-color);
}
.stats {
  font-size: 0.9rem;
  color: var(--subtle-text-color);
  text-align: right;
  padding: 0 0.5rem;
}

/* --- Results --- */
.results-wrapper {
    background: var(--surface-color);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    height: calc(100vh - 420px);
    display: flex;
    flex-direction: column;
}
.results-header {
    padding: 1rem 1.5rem;
    font-weight: 600;
    border-bottom: 1px solid var(--border-color);
    background-color: #fafafa;
}
.results {
  overflow-y: auto;
  padding: 0.5rem;
  height: 100%;
}
.log-line {
  padding: 0.5rem 1.5rem;
  font-family: 'Menlo', 'Consolas', monospace;
  font-size: 0.85rem;
  white-space: pre-wrap;
  word-break: break-all;
  cursor: pointer;
  border-radius: var(--border-radius-md);
  transition: background-color var(--transition-speed);
  line-height: 1.7;
}
.log-line:hover {
  background-color: var(--background-color);
}
.log-line.selected {
  background-color: var(--highlight-bg);
  color: var(--highlight-color);
  font-weight: 500;
}
.log-line mark {
  background-color: var(--primary-color);
  color: white;
  border-radius: 3px;
  padding: 0.2em 0.3em;
}

/* --- Details Pane --- */
.details-pane {
  flex: 2;
  position: sticky;
  top: 2rem;
  background-color: var(--surface-color);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
  height: calc(100vh - 120px);
  display: flex;
  flex-direction: column;
}
.details-pane.hidden {
  display: none;
}
.details-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  background-color: #fafafa;
}
.details-header h3 {
  margin: 0;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.details-header h3 svg {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--primary-color);
}
.close-btn {
  background: none;
  border: none;
  color: var(--subtle-text-color);
  font-size: 1.75rem;
  line-height: 1;
  cursor: pointer;
  transition: color var(--transition-speed);
  font-weight: 300;
}
.close-btn:hover {
  color: var(--text-color);
}
.details-content {
  padding: 1.5rem;
  overflow-y: auto;
  line-height: 1.8;
  color: #4a5568;
}
.details-content .loading {
  text-align: center;
  padding: 3rem;
  color: var(--subtle-text-color);
  font-style: italic;
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: #cbd5e0;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: #a0aec0;
}