/* ====== Variables & Base Styles ====== */
:root {
  --clr-bg: #0b0c1f;
  --clr-bg-alt: #161732;
  --clr-primary: #f9a825;
  --clr-primary-light: #fbc02d;
  --clr-accent: #5e35b1;
  --clr-text: #eceff1;
  --clr-text-muted: #a3a3c2;
  --font-serif: 'Merriweather', serif;
  --font-sans: 'Poppins', sans-serif;
  --transition-speed: 0.3s;
}

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

body {
  margin: 0;
  background-color: var(--clr-bg);
  color: var(--clr-text);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

/* ====== Utility ====== */
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1rem;
}

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* ====== Header ====== */
.header {
  position: sticky;
  top: 0;
  background: var(--clr-bg-alt);
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0,0,0,0.7);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--clr-primary);
  user-select: none;
  text-decoration: none;
  font-family: var(--font-serif);
}

.logo-text {
  line-height: 1;
}

.logo svg {
  stroke: var(--clr-primary);
}

.nav-list {
  list-style: none;
  display: flex;
  gap: 2rem;
  margin: 0;
  padding: 0;
}

.nav-link {
  color: var(--clr-text-muted);
  text-decoration: none;
  font-weight: 600;
  font-family: var(--font-sans);
  font-size: 1rem;
  position: relative;
  transition: color var(--transition-speed);
}

.nav-link.active,
.nav-link:hover,
.nav-link:focus {
  color: var(--clr-primary);
  outline: none;
}

.nav-link.active::after,
.nav-link:hover::after,
.nav-link:focus::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--clr-primary-light);
  border-radius: 2px;
}

/* ====== Hero Section ====== */
.hero-section {
  padding: 6rem 0 4rem;
  text-align: center;
  font-family: var(--font-serif);
}

.hero-title {
  font-size: 3rem;
  font-weight: 900;
  margin-bottom: 1rem;
  line-height: 1.1;
  background: linear-gradient(90deg, var(--clr-primary), var(--clr-primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--clr-text-muted);
  max-width: 600px;
  margin: 0 auto 2.5rem;
  font-weight: 400;
}

.cta-button {
  background: var(--clr-primary);
  color: var(--clr-bg);
  border: none;
  padding: 0.9rem 3rem;
  font-size: 1.2rem;
  font-weight: 700;
  border-radius: 9999px;
  cursor: pointer;
  box-shadow: 0 8px 25px rgb(249 168 37 / 0.6);
  transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
  user-select: none;
}

.cta-button:hover,
.cta-button:focus {
  background: var(--clr-primary-light);
  box-shadow: 0 12px 35px rgb(251 192 45 / 0.8);
  outline: none;
}

/* ====== Sections Common Styles ====== */
.section-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
  text-align: center;
  color: var(--clr-primary-light);
  text-shadow: 0 2px 6px rgba(94, 53, 177, 0.6);
}

section p {
  max-width: 700px;
  margin: 0 auto 2rem;
  color: var(--clr-text-muted);
  font-size: 1.15rem;
  line-height: 1.5;
  font-family: var(--font-sans);
}

/* ====== How It Works ====== */
.how-it-works .steps-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit,minmax(260px,1fr));
}

.step-card {
  background: var(--clr-bg-alt);
  padding: 2rem 1.8rem;
  border-radius: 14px;
  box-shadow: 0 6px 30px rgb(94 53 177 / 0.5);
  text-align: center;
  color: var(--clr-text);
  cursor: default;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.step-card:hover,
.step-card:focus {
  transform: translateY(-10px);
  box-shadow: 0 15px 40px rgb(249 168 37 / 0.8);
  outline: none;
}

.step-icon {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  color: var(--clr-primary);
}

/* ====== Features ====== */
.features-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit,minmax(280px,1fr));
}

.feature-card {
  background: var(--clr-bg-alt);
  padding: 2rem 2rem;
  border-radius: 14px;
  box-shadow: 0 6px 25px rgb(94 53 177 / 0.6);
  text-align: center;
  color: var(--clr-text);
  cursor: default;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover,
.feature-card:focus {
  transform: translateY(-10px);
  box-shadow: 0 15px 35px rgb(249 168 37 / 0.9);
  outline: none;
}

.feature-icon {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  color: var(--clr-primary-light);
}

/* ====== Use Cases ====== */
.use-cases-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit,minmax(280px,1fr));
}

.use-case-card {
  background: var(--clr-bg-alt);
  padding: 1.8rem 2rem;
  border-radius: 14px;
  box-shadow: 0 5px 20px rgb(94 53 177 / 0.5);
  color: var(--clr-text);
  cursor: default;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  text-align: center;
}

.use-case-card:hover,
.use-case-card:focus {
  transform: translateY(-8px);
  box-shadow: 0 14px 30px rgb(249 168 37 / 0.85);
  outline: none;
}

.use-case-card h3 {
  margin-top: 0;
  margin-bottom: 0.8rem;
  color: var(--clr-primary-light);
  font-family: var(--font-serif);
  font-weight: 700;
}

/* ====== Pricing ====== */
.pricing-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit,minmax(280px,1fr));
  margin-top: 2rem;
}

.pricing-card {
  background: var(--clr-bg-alt);
  padding: 2.5rem 2rem;
  border-radius: 18px;
  box-shadow: 0 6px 30px rgb(94 53 177 / 0.7);
  color: var(--clr-text);
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  cursor: default;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.pricing-card:hover,
.pricing-card:focus {
  transform: translateY(-10px);
  box-shadow: 0 18px 45px rgb(249 168 37 / 0.9);
  outline: none;
}

.pricing-card.featured {
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-primary-light));
  color: var(--clr-bg);
  box-shadow: 0 20px 60px rgb(249 168 37 / 1);
}

.pricing-card.featured .btn-primary {
  background: var(--clr-bg);
  color: var(--clr-primary);
  font-weight: 700;
}

.pricing-card h3 {
  margin-top: 0;
  margin-bottom: 1rem;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 1.8rem;
}

.price {
  font-size: 2.75rem;
  font-weight: 900;
  margin-bottom: 1rem;
}

.price span {
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--clr-text-muted);
}

.pricing-card ul {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 2.5rem;
  font-size: 1rem;
  text-align: left;
}

.pricing-card ul li {
  margin-bottom: 0.75rem;
  position: relative;
  padding-left: 1.3rem;
}

.pricing-card ul li::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--clr-primary);
  font-weight: 700;
}

.btn-primary {
  background: var(--clr-primary);
  color: var(--clr-bg);
  border: none;
  padding: 0.9rem 1.75rem;
  border-radius: 9999px;
  font-weight: 700;
  cursor: pointer;
  font-size: 1.1rem;
  transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
  user-select: none;
  align-self: center;
}

.btn-primary:hover,
.btn-primary:focus {
  background: var(--clr-primary-light);
  box-shadow: 0 12px 30px rgb(249 168 37 / 0.85);
  outline: none;
}

/* ====== Testimonials ====== */
.testimonials-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit,minmax(320px,1fr));
  margin-top: 2rem;
}

.testimonial {
  background: var(--clr-bg-alt);
  padding: 2rem 2.5rem;
  border-radius: 14px;
  box-shadow: 0 6px 30px rgb(94 53 177 / 0.6);
  font-style: italic;
  color: var(--clr-text-muted);
  position: relative;
  cursor: default;
  transition: box-shadow 0.3s ease;
}

.testimonial:hover,
.testimonial:focus {
  box-shadow: 0 18px 50px rgb(249 168 37 / 0.8);
  outline: none;
}

.testimonial p {
  margin: 0 0 1.25rem;
  font-size: 1.1rem;
  line-height: 1.5;
}

.testimonial footer {
  font-weight: 700;
  font-style: normal;
  color: var(--clr-primary-light);
  font-family: var(--font-serif);
  text-align: right;
}

/* ====== Generate Section ====== */
.generate-section {
  padding: 4rem 0 6rem;
}

#generate-form {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

#prompt-input {
  resize: vertical;
  padding: 1.2rem 1.5rem;
  font-size: 1.1rem;
  border-radius: 14px;
  border: none;
  background-color: var(--clr-bg-alt);
  color: var(--clr-text);
  font-family: var(--font-sans);
  box-shadow: inset 0 0 10px rgba(94,53,177,0.3);
  min-height: 130px;
  transition: box-shadow var(--transition-speed);
}

#prompt-input:focus {
  outline: none;
  box-shadow: 0 0 15px var(--clr-primary);
}

.generate-btn {
  background: var(--clr-primary);
  border: none;
  color: var(--clr-bg);
  font-weight: 700;
  font-size: 1.2rem;
  padding: 1rem 0;
  border-radius: 9999px;
  cursor: pointer;
  box-shadow: 0 10px 30px rgb(249 168 37 / 0.7);
  transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
  user-select: none;
}

.generate-btn:hover,
.generate-btn:focus {
  background: var(--clr-primary-light);
  box-shadow: 0 14px 40px rgb(249 192 45 / 0.9);
  outline: none;
}

/* Loading indicator */
.loading-indicator {
  margin: 2rem auto 0;
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.4s ease;
}

.loading-indicator.visible {
  visibility: visible;
  opacity: 1;
}

.loading-indicator .dot {
  width: 14px;
  height: 14px;
  background: var(--clr-primary);
  border-radius: 50%;
  animation: bounce 1.2s infinite ease-in-out;
}

.loading-indicator .dot:nth-child(2) {
  animation-delay: 0.2s;
}

.loading-indicator .dot:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes bounce {
  0%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-14px);
  }
}

/* Output */
.output {
  margin: 3rem auto 0;
  max-width: 720px;
  background: var(--clr-bg-alt);
  padding: 2rem 2.5rem;
  border-radius: 14px;
  box-shadow: 0 6px 30px rgb(94 53 177 / 0.8);
  color: var(--clr-text);
  font-size: 1.15rem;
  line-height: 1.6;
  min-height: 160px;
  white-space: pre-wrap;
  user-select: text;
  font-family: var(--font-serif);
}

/* Typing cursor */
.typing {
  border-right: 2px solid var(--clr-primary);
  animation: blink-caret 1s step-end infinite;
}

@keyframes blink-caret {
  0%, 100% {
    border-color: transparent;
  }
  50% {
    border-color: var(--clr-primary);
  }
}

/* ====== Final CTA ====== */
.final-cta {
  padding: 5rem 0 6rem;
  text-align: center;
  background: linear-gradient(90deg, #381e72, #f9a825);
  border-radius: 16px;
  margin: 4rem 1rem;
}

.final-cta .section-title {
  color: var(--clr-bg);
  font-size: 2.75rem;
  margin-bottom: 2rem;
  text-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.final-cta .cta-button {
  font-size: 1.5rem;
  padding: 1.25rem 4rem;
  box-shadow: 0 15px 50px rgb(249 168 37 / 0.9);
}

/* ====== Footer ====== */
.footer {
  background: var(--clr-bg-alt);
  padding: 2rem 1rem;
  color: var(--clr-text-muted);
  font-size: 0.9rem;
  text-align: center;
  user-select: none;
  font-family: var(--font-sans);
}

/* ====== Responsive ====== */
@media (max-width: 900px) {
  .hero-title {
    font-size: 2.25rem;
  }
  .nav-list {
    gap: 1rem;
  }
}

@media (max-width: 600px) {
  .hero-title {
    font-size: 1.75rem;
  }
  .hero-subtitle {
    font-size: 1rem;
  }
  .features-grid,
  .use-cases-grid,
  .pricing-grid,
  .testimonials-grid,
  .how-it-works .steps-grid {
    grid-template-columns: 1fr;
  }
  .nav-list {
    flex-wrap: wrap;
    justify-content: center;
  }
}