/* ============================================================
   CSS Custom Properties
   ============================================================ */
:root {
  --color-bg: #ffffff;
  --color-surface: #f5f5f7;
  --color-accent: #0071e3;
  --color-text: #1d1d1f;
  --color-text-secondary: #6e6e73;
  --color-border: #d2d2d7;

  --font-stack: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-pill: 100px;

  --max-width: 1040px;
}

/* ============================================================
   Reset & Base
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-stack);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

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

.section {
  padding: 80px 0;
}

.section--alt {
  background: var(--color-surface);
}

/* ============================================================
   Navigation / Header
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.site-header .logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.site-header .logo:hover {
  text-decoration: none;
}

.site-nav {
  display: flex;
  gap: 28px;
  list-style: none;
}

.site-nav a {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  transition: color 0.15s;
}

.site-nav a:hover {
  color: var(--color-text);
  text-decoration: none;
}

.site-nav a.active {
  color: var(--color-text);
  font-weight: 500;
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-pill);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
  border: none;
  text-decoration: none;
}

.btn:hover {
  text-decoration: none;
  opacity: 0.85;
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--color-text);
  color: #fff;
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  padding: 100px 0 80px;
  text-align: center;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: rgba(0, 113, 227, 0.08);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 20px;
  color: var(--color-text);
}

.hero p {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  color: var(--color-text-secondary);
  max-width: 520px;
  margin: 0 auto 36px;
  line-height: 1.55;
}

.hero-cta {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

/* PLACEHOLDER: Replace .hero-visual with a real device mockup image when ready.
   Suggested markup:
   <img src="images/hero-mockup.png" alt="PromptSoar on iPhone" class="hero-visual-img"> */
.hero-visual {
  margin: 0 auto;
  max-width: 280px;
  aspect-ratio: 9 / 19;
  background: var(--color-surface);
  border-radius: 40px;
  border: 2px dashed var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  box-shadow: 0 40px 80px rgba(0, 0, 0, 0.08);
}

/* ============================================================
   Section Header
   ============================================================ */
.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-header h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 12px;
}

.section-header p {
  font-size: 1rem;
  color: var(--color-text-secondary);
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.55;
}

/* ============================================================
   Feature Cards (homepage)
   ============================================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
}

.feature-card .icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

/* ============================================================
   How It Works
   ============================================================ */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
}

.step {
  text-align: center;
}

.step-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-text);
  color: #fff;
  font-size: 1.1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.step h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.step p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ============================================================
   Screenshots
   ============================================================ */
.screenshots-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: center;
}

/* PLACEHOLDER: Replace each .screenshot-placeholder div with an <img> tag.
   Example: <img src="images/screenshot-1.png" alt="Prompt library" class="screenshot"> */
.screenshot-placeholder {
  aspect-ratio: 9 / 19;
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  border: 2px dashed var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: 0.8rem;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.06);
}

.screenshot-placeholder.large {
  transform: scale(1.08);
  box-shadow: 0 24px 56px rgba(0, 0, 0, 0.1);
}

/* ============================================================
   Use Cases
   ============================================================ */
.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.use-case-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 20px;
}

.use-case-card .icon {
  font-size: 1.5rem;
  margin-bottom: 10px;
}

.use-case-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.use-case-card p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ============================================================
   Final CTA
   ============================================================ */
.final-cta {
  text-align: center;
}

.final-cta h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 14px;
}

.final-cta p {
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  font-size: 1rem;
}

.cta-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-logo {
  font-weight: 700;
  color: var(--color-text);
  font-size: 1rem;
}

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

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

.footer-copy {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  width: 100%;
  margin-top: 8px;
}

/* ============================================================
   Page Hero (inner pages)
   ============================================================ */
.page-hero {
  padding: 64px 0 48px;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.page-hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 14px;
}

.page-hero p {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  max-width: 520px;
  margin: 0 auto;
}

/* ============================================================
   Prose (Privacy & long-form content)
   ============================================================ */
.prose {
  max-width: 680px;
  margin: 0 auto;
}

.prose h2 {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 44px 0 12px;
}

.prose h2:first-child {
  margin-top: 0;
}

.prose h3 {
  font-size: 1rem;
  font-weight: 700;
  margin: 28px 0 8px;
}

.prose p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 14px;
}

.prose ul {
  padding-left: 20px;
  margin-bottom: 14px;
}

.prose li {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 6px;
}

/* ============================================================
   Support — Contact Card
   ============================================================ */
.contact-card {
  max-width: 480px;
  margin: 0 auto 72px;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  text-align: center;
}

.contact-card h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.contact-card p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  line-height: 1.55;
}

.contact-card a {
  font-size: 1rem;
  font-weight: 600;
}

.contact-note {
  display: block;
  margin-top: 12px;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

/* ============================================================
   Support — FAQ
   ============================================================ */
.faq-list {
  max-width: 680px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: 24px 0;
}

.faq-item:first-child {
  border-top: 1px solid var(--color-border);
}

.faq-item h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.faq-item p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ============================================================
   Features Page — Full Feature List
   ============================================================ */
.features-full {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}

.feature-full-item {
  display: flex;
  gap: 16px;
  padding: 24px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.feature-full-item .icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.feature-full-item h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.feature-full-item p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 700px) {
  .section {
    padding: 56px 0;
  }

  .hero {
    padding: 64px 0 56px;
  }

  .site-nav {
    gap: 16px;
  }

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

  .screenshot-placeholder.large {
    transform: none;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .contact-card {
    padding: 28px 24px;
  }
}