:root {
  --gh-bg-primary: #ffffff;
  --gh-bg-secondary: #f6f8fa;
  --gh-bg-tertiary: #f0f2f5; /* Page background */
  --gh-text-primary: #24292e;
  --gh-text-secondary: #586069;
  --gh-border-primary: #d1d5da;
  --gh-border-secondary: #e1e4e8;
  --gh-header-bg: #24292e;
  --gh-header-text: #ffffff;
  --gh-button-green-bg: #2ea44f;
  --gh-button-green-hover-bg: #2c974b;
  --gh-button-blue-bg: #0366d6;
  --gh-button-blue-hover-bg: #005cc5;
  --gh-button-purple-bg: #6f42c1;
  --gh-button-purple-hover-bg: #5832a0;
  --gh-button-disabled-bg: #94d3a2;
  --gh-error-text: #cb2431;
  --gh-error-bg: #fcebea;
  --gh-error-border: #ffccd0;
  --gh-focus-ring: rgba(3, 102, 214, 0.3);
  --gh-font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  --gh-font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
  --gh-border-radius: 8px; /* Slightly increased border radius for a softer look */
  --gh-shadow-small: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.12);
  --gh-shadow-medium: 0 4px 8px rgba(0,0,0,0.08), 0 3px 6px rgba(0,0,0,0.10); /* Slightly enhanced shadow */
}

@media (prefers-color-scheme: dark) {
  :root {
    --gh-bg-primary: #1c2128; /* Darker card background */
    --gh-bg-secondary: #161b22; /* Darker code background */
    --gh-bg-tertiary: #0d1117; /* Dark page background */
    --gh-text-primary: #e6edf3; /* Lighter text */
    --gh-text-secondary: #909dab; /* Muted lighter text */
    --gh-border-primary: #30363d;
    --gh-border-secondary: #21262d;
    --gh-button-green-bg: #238636;
    --gh-button-green-hover-bg: #2ea043;
    --gh-button-disabled-bg: #1c5324;
    --gh-error-text: #f85149;
    --gh-error-bg: #481317;
    --gh-error-border: #6b2026;
    --gh-focus-ring: rgba(29, 155, 240, 0.4); /* Slightly more visible focus ring */
  }
}

* {
  box-sizing: border-box;
}

body {
  font-family: var(--gh-font-system);
  font-size: 16px; /* Increased base font size */
  margin: 0;
  background: var(--gh-bg-tertiary);
  color: var(--gh-text-primary);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  line-height: 1.6; /* Increased line height for readability */
}

.header {
  background: var(--gh-header-bg);
  color: var(--gh-header-text);
  padding: 0.75rem 1.5rem;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header h1 {
  margin: 0;
  font-size: 2.2rem; /* Slightly larger */
  font-weight: 600; /* Bolder */
}

/* Main Navigation */
.main-nav {
  margin-top: 1rem;
  padding-bottom: 0.5rem; /* Give some space if header has bottom border */
}

.main-nav a {
  color: var(--link-color);
  text-decoration: none;
  margin: 0 0.75rem;
  padding: 0.5rem 0;
  font-size: 1rem;
  font-weight: 500;
  border-bottom: 2px solid transparent;
  transition: color 0.3s ease, border-bottom-color 0.3s ease;
}

.main-nav a:hover,
.main-nav a:focus {
  color: var(--link-hover-color);
  border-bottom-color: var(--link-hover-color);
}

/* Active link styling - can be added via JS or server-side logic if needed */
/* .main-nav a.active {
  color: var(--link-hover-color);
  border-bottom-color: var(--link-hover-color);
  font-weight: 700;
} */

.hero {
  background: var(--gh-bg-primary);
  padding: 4rem 1.5rem;
  text-align: center;
  border-bottom: 1px solid var(--gh-border-primary);
}

#hero-logo {
  height: 320px;
  margin-bottom: 3rem;
  display: block;
  margin-left: auto;
  margin-right: auto;
}

.taglines {
  margin-bottom: 2.5rem;
}

.taglines h2 {
  font-size: 2rem;
  font-weight: 600;
  margin: 0 0 1rem;
  color: var(--gh-text-primary);
}

.taglines p {
  font-size: 1.25rem;
  color: var(--gh-text-secondary);
  margin: 0;
  line-height: 1.7;
}

.taglines br {
  display: block;
  margin: 0.5rem 0;
}

.hero #repoForm {
  max-width: 700px;
  margin: 0 auto;
}

.hero #github_url {
  font-size: 1.25rem;
  padding: 1rem 1.5rem;
}

.hero #submitBtn {
  font-size: 1.25rem;
  padding: 1rem 2rem;
}

.container {
  max-width: 900px;
  width: 90%;
  background: var(--gh-bg-primary);
  margin: 2.5rem auto; /* Increased margin */
  padding: 2.5rem 3rem; /* Increased padding */
  border-radius: var(--gh-border-radius);
  box-shadow: var(--gh-shadow-medium);
  flex: 1;
  display: flex;
  flex-direction: column;
}

input[type="url"] {
  font-size: 1.2rem; /* Further increased font size */
  padding: 1rem 1.2rem; /* Further increased padding */
  width: 100%;
  margin-bottom: 1.5rem; /* Increased margin for more space */
  border: 1px solid var(--gh-border-primary);
  border-radius: var(--gh-border-radius);
  background-color: var(--gh-bg-primary);
  color: var(--gh-text-primary);
  transition: border-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}
input[type="url"]::placeholder {
    color: var(--gh-text-secondary);
    opacity: 0.7;
}
input[type="url"]:focus {
  border-color: var(--gh-button-blue-bg);
  box-shadow: 0 0 0 4px var(--gh-focus-ring); /* Enhanced focus ring */
  outline: none;
}

button {
  font-size: 1.1rem; /* Increased font size for all buttons */
  font-weight: 600;
  color: white;
  padding: 0.9rem 1.8rem; /* Adjusted padding for all buttons */
  border: 1px solid transparent;
  border-radius: var(--gh-border-radius);
  cursor: pointer;
  transition: background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

#submitBtn {
  font-size: 1.15rem; /* Specific larger size for submit button */
  padding: 1rem 2rem; /* Specific larger padding for submit button */
  background: var(--gh-button-green-bg);
  border-color: rgba(27,31,35,0.15);
}
#submitBtn:hover {
  background: var(--gh-button-green-hover-bg);
}
#submitBtn:disabled {
  background: var(--gh-button-disabled-bg);
  color: rgba(255,255,255,0.7);
  border-color: transparent;
  cursor: not-allowed;
}

.loading {
  font-style: italic;
  margin: 1.75rem 0; /* Increased margin */
  text-align: center;
  color: var(--gh-text-secondary);
  font-size: 1.1em; /* Increased font size */
}
.loading::before {
    content: "";
    display: inline-block;
    width: 1.2em; /* Larger spinner */
    height: 1.2em;
    margin-right: 0.6em;
    border: 3px solid currentColor; /* Thicker border */
    border-right-color: transparent;
    border-radius: 50%;
    animation: spinner 0.75s linear infinite;
    vertical-align: text-bottom;
}
@keyframes spinner {
    to { transform: rotate(360deg); }
}

.error {
  color: var(--gh-error-text);
  background: var(--gh-error-bg);
  padding: 1.25rem; /* Increased padding */
  border-radius: var(--gh-border-radius);
  margin: 1.75rem 0;
  border: 1px solid var(--gh-error-border);
  font-size: 1.05em;
}

#resultContainer {
  margin-top: 1.75rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  min-height: 0;
}

.controls {
  margin-bottom: 1rem;
  display: flex;
  gap: 0.85rem;
  justify-content: flex-end;
}
.controls button {
  padding: 0.6rem 1.2rem;
  font-size: 0.95em;
}

#copyBtn {
  background-color: var(--gh-button-purple-bg);
  border-color: rgba(27,31,35,0.15);
}
#copyBtn:hover {
  background-color: var(--gh-button-purple-hover-bg);
}

#downloadBtn {
  background-color: var(--gh-button-blue-bg);
  border-color: rgba(27,31,35,0.15);
}
#downloadBtn:hover {
  background-color: var(--gh-button-blue-hover-bg);
}

#result {
  background: var(--gh-bg-secondary);
  color: var(--gh-text-primary);
  padding: 1.25rem 1.5rem; /* Increased padding */
  border: 1px solid var(--gh-border-primary);
  border-radius: var(--gh-border-radius);
  font-family: var(--gh-font-mono);
  font-size: 0.95em; /* Increased font size for code */
  line-height: 1.7; /* Increased line height for code */
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-y: auto;
  flex-grow: 1;
  min-height: 350px; /* Increased min-height */
}
#result h1, #result h2, #result h3, #result h4, #result h5, #result h6 {
    color: var(--gh-text-primary);
    border-bottom: 1px solid var(--gh-border-secondary);
    padding-bottom: 0.4em;
    margin-top: 1.75em;
    margin-bottom: 1.2em;
    font-weight: 600;
}
#result h1 { font-size: 2em; }
#result h2 { font-size: 1.7em; }
#result h3 { font-size: 1.4em; }

#result code {
    background-color: rgba(175,184,193,0.2);
    padding: .2em .4em;
    margin: 0;
    font-size: 90%; /* Adjusted for new base */
    border-radius: calc(var(--gh-border-radius) - 2px); /* Slightly smaller radius for inline code */
}
#result pre > code {
    background-color: transparent;
    padding: 0;
    margin: 0;
    font-size: 100%;
    border-radius: 0;
}
#resultContainer {
  margin-top: 2rem;
}

.result-actions {
  margin-bottom: 1rem;
  display: flex;
  gap: 0.5rem;
}

.action-btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--gh-border-radius);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s;
}

#copyBtn {
  background-color: #8957e5;
  color: white;
}

#copyBtn:hover {
  background-color: #7548c7;
}

#downloadBtn {
  background-color: #0969da;
  color: white;
}

#downloadBtn:hover {
  background-color: #0860c9;
}

#result {
  max-height: 500px;
  overflow-y: auto;
  border-radius: var(--gh-border-radius);
  background-color: var(--gh-bg-secondary);
}

.result pre {
  padding: 1.5rem;
  margin: 0;
  overflow-x: auto;
  font-family: 'Consolas', 'Monaco', 'Andale Mono', 'Ubuntu Mono', monospace;
  line-height: 1.6;
  background-color: transparent;
}

.result pre code {
  color: var(--gh-text-primary);
  white-space: pre-wrap;
}

#welcome {
  opacity: 0.8;
}

.welcome-preview pre {
  background-color: var(--gh-code-bg);
  border-radius: 6px;
  padding: 1.5rem;
  overflow-x: auto;
  line-height: 1.6;
}

.welcome-preview pre code {
  color: var(--gh-text-primary);
  font-family: 'Consolas', 'Monaco', 'Andale Mono', 'Ubuntu Mono', monospace;
}

.welcome-preview pre code h1,
.welcome-preview pre code h2 {
  color: var(--gh-text-primary);
  margin-top: 0;
  margin-bottom: 1rem;
}

.welcome-preview pre code h2 {
  margin-top: 2rem;
}

.welcome-preview pre code .python {
  color: var(--gh-text-secondary);
}

.footer {
  text-align: center;
  padding: 1.75rem;
  color: var(--gh-text-secondary);
  font-size: 0.95em;
  margin-top: auto;
  border-top: 1px solid var(--gh-border-secondary);
}
.footer p {
    margin: 0;
}
.footer a {
    color: var(--gh-button-blue-bg);
    text-decoration: none;
    font-weight: 500;
}
.footer a:hover {
    text-decoration: underline;
}