/* FunctionGemma Landing Site - Style Sheet */
/* Clean, professional, developer-friendly design */

:root {
  --primary: #4285f4;
  --primary-dark: #1a73e8;
  --secondary: #34a853;
  --accent: #ea4335;
  --dark: #202124;
  --gray-900: #3c4043;
  --gray-700: #5f6368;
  --gray-500: #9aa0a6;
  --gray-300: #dadce0;
  --gray-100: #f1f3f4;
  --white: #ffffff;
  --code-bg: #1e1e1e;
  --code-text: #d4d4d4;
  --max-width: 1200px;
  --nav-height: 64px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--dark);
  background: var(--white);
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
}

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--white);
  border-bottom: 1px solid var(--gray-300);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--dark);
}

.nav-logo span {
  color: var(--primary);
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--gray-700);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
  text-decoration: none;
  border-bottom-color: var(--primary);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--dark);
  margin: 5px 0;
  transition: 0.3s;
}

/* Hero Section */
.hero {
  padding: 140px 0 80px;
  background: linear-gradient(180deg, var(--gray-100) 0%, var(--white) 100%);
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-content h1 {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--dark);
  margin-bottom: 20px;
}

.hero-content h1 span {
  color: var(--primary);
}

.hero-content .subtitle {
  font-size: 1.25rem;
  color: var(--gray-700);
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-illustration {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-illustration img,
.hero-illustration svg {
  max-width: 100%;
  height: auto;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--primary);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--primary-dark);
  color: var(--white);
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(66, 133, 244, 0.3);
}

.btn-secondary {
  background: var(--white);
  color: var(--primary);
  border: 2px solid var(--primary);
}

.btn-secondary:hover {
  background: var(--gray-100);
  color: var(--primary-dark);
  text-decoration: none;
}

.btn-success {
  background: var(--secondary);
  color: var(--white);
}

.btn-success:hover {
  background: #2d9249;
  color: var(--white);
  text-decoration: none;
}

/* Sections */
section {
  padding: 80px 0;
}

section:nth-child(even) {
  background: var(--gray-100);
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header h2 {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 16px;
}

.section-header p {
  font-size: 1.125rem;
  color: var(--gray-700);
  max-width: 700px;
  margin: 0 auto;
}

/* What Is Section */
.what-is-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.what-is-text h3 {
  font-size: 1.5rem;
  margin-bottom: 16px;
  color: var(--dark);
}

.what-is-text p {
  color: var(--gray-700);
  margin-bottom: 16px;
  font-size: 1.05rem;
}

.what-is-list {
  list-style: none;
  margin-top: 24px;
}

.what-is-list li {
  padding: 12px 0;
  padding-left: 32px;
  position: relative;
  color: var(--gray-700);
}

.what-is-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  background: var(--secondary);
  border-radius: 50%;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z'/%3E%3C/svg%3E");
  background-size: 14px;
  background-repeat: no-repeat;
  background-position: center;
}

/* Pain Points */
.pain-points {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.pain-point {
  background: var(--white);
  padding: 32px;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  border-left: 4px solid var(--accent);
}

.pain-point h3 {
  font-size: 1.125rem;
  color: var(--dark);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.pain-point h3::before {
  content: "!";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--accent);
  color: var(--white);
  border-radius: 50%;
  font-weight: 700;
  font-size: 1rem;
}

.pain-point p {
  color: var(--gray-700);
  font-size: 0.95rem;
}

/* Demo Section */
.demo-container {
  background: var(--white);
  border-radius: 16px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.1);
  overflow: hidden;
}

.demo-tabs {
  display: flex;
  border-bottom: 1px solid var(--gray-300);
  background: var(--gray-100);
}

.demo-tab {
  padding: 16px 24px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--gray-700);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: all 0.2s;
}

.demo-tab:hover {
  color: var(--primary);
}

.demo-tab.active {
  background: var(--white);
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.demo-content {
  padding: 32px;
}

.demo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 24px;
}

.demo-column h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--gray-500);
  margin-bottom: 12px;
}

.demo-input {
  background: var(--gray-100);
  padding: 20px;
  border-radius: 8px;
  font-size: 1rem;
  color: var(--dark);
  min-height: 120px;
}

.demo-output {
  background: var(--code-bg);
  padding: 20px;
  border-radius: 8px;
  min-height: 120px;
  overflow-x: auto;
}

.demo-output pre {
  margin: 0;
  font-family: 'SF Mono', Monaco, 'Cascadia Code', Consolas, monospace;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--code-text);
}

.demo-action {
  background: var(--gray-100);
  padding: 20px;
  border-radius: 8px;
  min-height: 120px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.demo-action .action-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.demo-action p {
  color: var(--gray-700);
  font-size: 0.95rem;
}

.demo-run {
  margin-top: 24px;
  text-align: center;
}

/* JSON Syntax Highlighting */
.json-key {
  color: #9cdcfe;
}

.json-string {
  color: #ce9178;
}

.json-bracket {
  color: #ffd700;
}

/* How It Works */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  position: relative;
}

.steps::before {
  content: "";
  position: absolute;
  top: 40px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: var(--gray-300);
  z-index: 0;
}

.step {
  text-align: center;
  position: relative;
  z-index: 1;
}

.step-number {
  width: 80px;
  height: 80px;
  background: var(--primary);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  font-weight: 700;
  margin: 0 auto 20px;
  box-shadow: 0 4px 12px rgba(66, 133, 244, 0.3);
}

.step h3 {
  font-size: 1.125rem;
  color: var(--dark);
  margin-bottom: 12px;
}

.step p {
  color: var(--gray-700);
  font-size: 0.95rem;
}

/* Use Cases */
.use-cases {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.use-case {
  background: var(--white);
  padding: 28px;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  transition: all 0.2s;
  border: 1px solid var(--gray-300);
}

.use-case:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  border-color: var(--primary);
}

.use-case-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.use-case h3 {
  font-size: 1.125rem;
  color: var(--dark);
  margin-bottom: 8px;
}

.use-case p {
  color: var(--gray-700);
  font-size: 0.9rem;
}

/* FAQ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--white);
  border-radius: 12px;
  margin-bottom: 16px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 24px 32px;
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--dark);
  transition: background 0.2s;
}

.faq-question:hover {
  background: var(--gray-100);
}

.faq-question::after {
  content: "+";
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--primary);
  transition: transform 0.3s;
}

.faq-item.active .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

.faq-answer-content {
  padding: 0 32px 24px;
  color: var(--gray-700);
  line-height: 1.7;
}

/* Resources */
.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.resource-card {
  background: var(--white);
  padding: 24px;
  border-radius: 12px;
  border: 1px solid var(--gray-300);
  transition: all 0.2s;
}

.resource-card:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.resource-card h3 {
  font-size: 1rem;
  color: var(--dark);
  margin-bottom: 8px;
}

.resource-card p {
  font-size: 0.9rem;
  color: var(--gray-700);
  margin-bottom: 12px;
}

.resource-card a {
  font-size: 0.9rem;
  font-weight: 500;
}

/* CTA Section */
.cta-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--white);
  text-align: center;
}

.cta-section h2 {
  color: var(--white);
  margin-bottom: 16px;
}

.cta-section p {
  font-size: 1.125rem;
  opacity: 0.9;
  margin-bottom: 32px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.email-form {
  display: flex;
  gap: 12px;
  max-width: 480px;
  margin: 0 auto;
  flex-wrap: wrap;
  justify-content: center;
}

.email-form input[type="email"] {
  flex: 1;
  min-width: 250px;
  padding: 16px 20px;
  font-size: 1rem;
  border: none;
  border-radius: 8px;
  outline: none;
}

.email-form input[type="email"]:focus {
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.3);
}

.email-form button {
  padding: 16px 32px;
}

.form-success {
  display: none;
  background: rgba(255, 255, 255, 0.2);
  padding: 16px 24px;
  border-radius: 8px;
  margin-top: 16px;
}

.form-success.show {
  display: block;
}

/* Footer */
.footer {
  background: var(--dark);
  color: var(--gray-500);
  padding: 48px 0 24px;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand h3 {
  color: var(--white);
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.footer-brand h3 span {
  color: var(--primary);
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer-links h4 {
  color: var(--white);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
}

.footer-links ul {
  list-style: none;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  color: var(--gray-500);
  font-size: 0.9rem;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--white);
  text-decoration: none;
}

.footer-bottom {
  border-top: 1px solid var(--gray-700);
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
}

/* Playground Page */
.playground-hero {
  padding: 120px 0 40px;
  background: var(--gray-100);
  text-align: center;
}

.playground-hero h1 {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.playground-hero p {
  color: var(--gray-700);
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto;
}

.playground-main {
  padding: 48px 0 80px;
}

.playground-interface {
  background: var(--white);
  border-radius: 16px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  max-width: 900px;
  margin: 0 auto;
}

.playground-header {
  background: var(--gray-100);
  padding: 16px 24px;
  border-bottom: 1px solid var(--gray-300);
  display: flex;
  align-items: center;
  gap: 8px;
}

.playground-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.playground-dot.red { background: #ff5f57; }
.playground-dot.yellow { background: #febc2e; }
.playground-dot.green { background: #28c840; }

.playground-body {
  padding: 32px;
}

.playground-input-area {
  margin-bottom: 24px;
}

.playground-input-area label {
  display: block;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--dark);
}

.playground-input-area textarea {
  width: 100%;
  min-height: 100px;
  padding: 16px;
  border: 2px solid var(--gray-300);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  resize: vertical;
  transition: border-color 0.2s;
}

.playground-input-area textarea:focus {
  outline: none;
  border-color: var(--primary);
}

.playground-examples {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.example-chip {
  padding: 8px 16px;
  background: var(--gray-100);
  border: 1px solid var(--gray-300);
  border-radius: 20px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}

.example-chip:hover {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

.playground-output-area {
  margin-top: 24px;
}

.playground-output-area label {
  display: block;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--dark);
}

.playground-output {
  background: var(--code-bg);
  padding: 24px;
  border-radius: 8px;
  min-height: 150px;
}

.playground-output pre {
  margin: 0;
  font-family: 'SF Mono', Monaco, 'Cascadia Code', Consolas, monospace;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--code-text);
  white-space: pre-wrap;
}

.playground-disclaimer {
  margin-top: 24px;
  padding: 16px;
  background: #fff8e1;
  border-radius: 8px;
  border-left: 4px solid #ffc107;
  font-size: 0.9rem;
  color: var(--gray-900);
}

/* Privacy Page */
.privacy-page {
  padding: 120px 0 80px;
  min-height: 100vh;
}

.privacy-content {
  max-width: 700px;
  margin: 0 auto;
}

.privacy-content h1 {
  font-size: 2.5rem;
  margin-bottom: 32px;
}

.privacy-content h2 {
  font-size: 1.5rem;
  margin-top: 32px;
  margin-bottom: 16px;
}

.privacy-content p {
  color: var(--gray-700);
  margin-bottom: 16px;
  line-height: 1.7;
}

.privacy-content ul {
  margin-left: 24px;
  color: var(--gray-700);
}

.privacy-content li {
  margin-bottom: 8px;
}

/* Responsive */
@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-cta {
    justify-content: center;
  }

  .hero-illustration {
    order: -1;
    max-width: 400px;
    margin: 0 auto;
  }

  .what-is-content {
    grid-template-columns: 1fr;
  }

  .steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps::before {
    display: none;
  }

  .demo-grid {
    grid-template-columns: 1fr;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--gray-300);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  }

  .nav-links.active {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .hero-content h1 {
    font-size: 2.25rem;
  }

  section {
    padding: 60px 0;
  }

  .section-header h2 {
    font-size: 1.75rem;
  }

  .steps {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .step-number {
    width: 60px;
    height: 60px;
    font-size: 1.5rem;
  }

  .faq-question {
    padding: 20px 24px;
    font-size: 1rem;
  }

  .email-form {
    flex-direction: column;
  }

  .email-form input[type="email"] {
    min-width: auto;
  }
}

/* Utility Classes */
.text-center { text-align: center; }
.mt-4 { margin-top: 16px; }
.mt-8 { margin-top: 32px; }
.mb-4 { margin-bottom: 16px; }
.mb-8 { margin-bottom: 32px; }