/*
 * Flash-inspired UI for AI Writer Hub
 * Dark aurora gradients, glassmorphism cards, glowing accents, and smooth
 * motion tuned to feel like a polished SaaS landing page.
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Space+Grotesk:wght@500;700&display=swap');

:root {
  --primary-start: #7c6bff;
  --primary-end: #5cf4ff;
  --accent: #ff7ad1;
  --text-color: #e9ecff;
  --text-light: #c6c9da;
  --background: #070815;
  --panel: rgba(255, 255, 255, 0.05);
  --border-color: rgba(255, 255, 255, 0.16);
  --glow: 0 10px 40px rgba(124, 107, 255, 0.35);
  --radius: 14px;
  --max-width: 1200px;
  --transition: 0.35s ease;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    Helvetica, Arial, sans-serif;
  line-height: 1.7;
  color: var(--text-color);
  background: radial-gradient(circle at 20% 20%, rgba(92, 244, 255, 0.08), transparent 35%),
    radial-gradient(circle at 80% 0%, rgba(255, 122, 209, 0.1), transparent 40%),
    linear-gradient(135deg, #0b0d1d, #060712 55%, #0f1030);
  min-height: 100vh;
  padding-bottom: 4rem;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, rgba(124, 107, 255, 0.07), transparent 45%);
  pointer-events: none;
  z-index: -1;
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  background: linear-gradient(
      90deg,
      transparent 0,
      rgba(255, 255, 255, 0.02) 1px,
      transparent 0
    ),
    linear-gradient(0deg, transparent 0, rgba(255, 255, 255, 0.025) 1px, transparent 0);
  background-size: 120px 120px;
  opacity: 0.35;
  mix-blend-mode: screen;
  pointer-events: none;
  z-index: -2;
}

a {
  color: var(--primary-end);
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
}

a:hover,
.navbar nav a:focus-visible {
  color: var(--accent);
}

img {
  max-width: 100%;
  display: block;
  border-radius: var(--radius);
}

.container {
  width: 90%;
  max-width: var(--max-width);
  margin: 0 auto;
}

/* Navigation */
.navbar {
  position: sticky;
  top: 0;
  z-index: 900;
  background: rgba(7, 8, 21, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
}

.navbar.navbar-scrolled {
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.55);
  background: rgba(7, 8, 21, 0.92);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0.5rem;
  gap: 1rem;
}

.logo {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-weight: 700;
  font-size: 1.8rem;
  background: linear-gradient(120deg, var(--primary-start), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 0.4px;
}

.navbar nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.navbar nav a {
  color: var(--text-light);
  font-weight: 600;
  padding: 0.4rem 0.6rem;
  border-radius: 10px;
  position: relative;
}

.navbar nav a.active {
  color: var(--text-color);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
}

.navbar nav a::after {
  content: '';
  position: absolute;
  inset: auto 0 -4px 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-start), var(--accent));
  opacity: 0;
  transform: scaleX(0.6);
  transition: var(--transition);
}

.navbar nav a:hover::after,
.navbar nav a:focus-visible::after,
.navbar nav a.active::after {
  opacity: 1;
  transform: scaleX(1);
}

/* Hero */
.hero {
  margin: 2rem auto;
  padding: 3.5rem 2.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  background: linear-gradient(160deg, rgba(124, 107, 255, 0.12), rgba(92, 244, 255, 0.08)),
    rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  box-shadow: 0 15px 50px rgba(0, 0, 0, 0.55);
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.hero::before,
.hero::after {
  content: '';
  position: absolute;
  width: 240px;
  height: 240px;
  background: radial-gradient(circle, rgba(255, 122, 209, 0.2), transparent 60%);
  filter: blur(30px);
  opacity: 0.9;
  z-index: 0;
}

.hero::before {
  top: -80px;
  right: -60px;
}

.hero::after {
  bottom: -90px;
  left: -70px;
  background: radial-gradient(circle, rgba(92, 244, 255, 0.25), transparent 60%);
}

.hero-content,
.hero-image {
  position: relative;
  z-index: 1;
}

.hero-content h1 {
  font-size: clamp(2.2rem, 3vw, 3rem);
  margin-bottom: 1rem;
  background: linear-gradient(120deg, var(--primary-start), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-content p {
  color: var(--text-light);
  font-size: 1.05rem;
  margin-bottom: 1.5rem;
}

.hero-image {
  display: grid;
  place-items: center;
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.12);
  transition: transform var(--transition), box-shadow var(--transition);
}

/* CTA */
.cta-button {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: linear-gradient(120deg, var(--primary-start), var(--accent));
  color: #0b0d1d;
  padding: 0.85rem 1.5rem;
  border-radius: 999px;
  font-weight: 700;
  letter-spacing: 0.3px;
  box-shadow: var(--glow);
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
  animation: glowPulse 2.6s ease-in-out infinite;
}

/* Article depth + CTA grid */
.article-depth {
  margin: 3rem auto;
  padding: 2.5rem;
  background: linear-gradient(120deg, rgba(92, 244, 255, 0.08), rgba(255, 122, 209, 0.08)),
    rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  box-shadow: 0 15px 55px rgba(0, 0, 0, 0.55);
}

.article-depth h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--primary-start), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.article-depth p {
  margin-bottom: 1.1rem;
  color: var(--text-light);
}

.article-cta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.cta-card {
  padding: 1.4rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  box-shadow: 0 10px 35px rgba(0, 0, 0, 0.4);
}

.cta-card h3 {
  margin-bottom: 0.75rem;
}

.cta-card ul {
  list-style: disc;
  padding-left: 1.2rem;
  color: var(--text-light);
}

.cta-card li {
  margin-bottom: 0.5rem;
}

.pill-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.pill-links a {
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
  color: var(--text-color);
  font-weight: 600;
}

.cta-button:hover {
  transform: translateY(-2px) scale(1.01);
  box-shadow: 0 15px 45px rgba(92, 244, 255, 0.35);
  filter: brightness(1.05);
}

.cta-ghost {
  background: transparent;
  color: var(--text-color);
  border: 1px solid var(--border-color);
  box-shadow: none;
}

@keyframes glowPulse {
  0% {
    box-shadow: 0 12px 35px rgba(92, 244, 255, 0.35);
    transform: translateY(0);
  }
  50% {
    box-shadow: 0 16px 55px rgba(255, 122, 209, 0.4);
    transform: translateY(-1px) scale(1.01);
  }
  100% {
    box-shadow: 0 12px 35px rgba(92, 244, 255, 0.35);
    transform: translateY(0);
  }
}

/* Sections */
section.container {
  margin: 2rem auto;
  padding: 2.5rem;
  background: var(--panel);
  border: 1px solid var(--border-color);
  border-radius: 18px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

section.container::before,
section.container::after {
  content: '';
  position: absolute;
  inset: 12px;
  border-radius: 16px;
  background: radial-gradient(circle at 20% 20%, rgba(124, 107, 255, 0.08), transparent 35%);
  opacity: 0.9;
  pointer-events: none;
  z-index: 0;
}

section.container::after {
  inset: 18px;
  background: radial-gradient(circle at 80% 60%, rgba(92, 244, 255, 0.08), transparent 40%);
}

section h2 {
  font-size: clamp(1.9rem, 2.4vw, 2.4rem);
  margin-bottom: 0.8rem;
  text-align: center;
  background: linear-gradient(120deg, var(--primary-start), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

section p {
  max-width: 960px;
  margin: 0.75rem auto 0.5rem;
  color: var(--text-light);
  text-align: center;
  line-height: 1.75;
}

section.container > * {
  position: relative;
  z-index: 1;
}

ul,
ol {
  margin: 1rem auto;
  padding-left: 1.2rem;
  color: var(--text-light);
}

li {
  margin: 0.4rem 0;
}

.keywords-list {
  list-style: disc;
  max-width: 700px;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1rem;
}

.chip {
  padding: 0.55rem 0.9rem;
  border-radius: 999px;
  background: linear-gradient(120deg, rgba(124, 107, 255, 0.25), rgba(92, 244, 255, 0.2));
  border: 1px solid var(--border-color);
  color: var(--text-color);
  font-weight: 600;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.chip:hover,
.chip:focus-visible {
  color: #fff;
  border-color: rgba(255, 122, 209, 0.8);
  box-shadow: 0 14px 40px rgba(92, 244, 255, 0.35);
}

/* Cards & grids */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.4rem;
  margin-top: 1.6rem;
}

.card {
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02));
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.45);
}

.card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 20%, rgba(92, 244, 255, 0.12), transparent 35%);
  opacity: 0;
  transition: opacity var(--transition);
}

.card:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 255, 255, 0.28);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.55);
}

.card:hover::after {
  opacity: 1;
}

.card h3 {
  font-size: 1.3rem;
  color: var(--text-color);
}

.card img {
  width: 100%;
  height: 170px;
  object-fit: cover;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.card p {
  color: var(--text-light);
  text-align: left;
  flex: 1;
  line-height: 1.6;
}

.card .read-more {
  align-self: flex-start;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-color);
  padding: 0.55rem 1.1rem;
  border-radius: 999px;
  font-weight: 600;
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.card .read-more:hover {
  background: linear-gradient(120deg, var(--primary-start), var(--accent));
  color: #0b0d1d;
  box-shadow: var(--glow);
}

/* FAQ */
.faq {
  max-width: 900px;
  margin: 1.5rem auto 0;
}

.faq-item {
  margin-bottom: 1.3rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--border-color);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.04);
}

.faq-item h4 {
  font-size: 1.1rem;
  margin-bottom: 0.35rem;
  color: var(--text-color);
}

.faq-item p {
  text-align: left;
}

/* Footer */
.footer {
  background: rgba(7, 8, 21, 0.85);
  padding: 2.2rem 0;
  text-align: center;
  font-size: 0.95rem;
  color: var(--text-light);
  border-top: 1px solid var(--border-color);
}

.footer a {
  color: var(--primary-end);
  font-weight: 600;
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.reveal-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Popup */
.popup {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  max-width: 340px;
  padding: 1.6rem;
  background: rgba(7, 8, 21, 0.92);
  color: #ffffff;
  border-radius: 16px;
  border: 1px solid var(--border-color);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6);
  z-index: 1000;
  display: none;
}

.popup.show {
  display: block;
  animation: floatIn 0.6s ease, gentleBounce 5s ease-in-out infinite;
}

.popup h4 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

.popup p {
  font-size: 0.95rem;
  margin-bottom: 1rem;
  color: var(--text-light);
  text-align: left;
}

.popup .cta-button {
  padding: 0.6rem 1.1rem;
  font-size: 0.95rem;
}

.popup-close {
  position: absolute;
  top: 0.35rem;
  right: 0.5rem;
  cursor: pointer;
  font-size: 1.2rem;
  color: #ffffff;
  opacity: 0.75;
  transition: opacity var(--transition);
}

.popup-close:hover {
  opacity: 1;
}

@keyframes floatIn {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes gentleBounce {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-4px);
  }
}

/* Sticky CTA */
.sticky-cta {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 850;
  background: linear-gradient(120deg, var(--primary-start), var(--accent));
  color: #0b0d1d;
  padding: 0.95rem 1.4rem;
  border-radius: 999px;
  font-weight: 700;
  box-shadow: var(--glow);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.sticky-cta:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 40px rgba(124, 107, 255, 0.4);
}

/* Breadcrumbs */
.breadcrumbs {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--text-light);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.breadcrumbs a {
  color: var(--primary-end);
}

/* Utilities */
.tagline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.9rem;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 999px;
  border: 1px solid var(--border-color);
  color: var(--text-light);
  font-weight: 600;
}

blockquote {
  margin: 1.2rem auto;
  padding: 1rem 1.2rem;
  border-left: 4px solid var(--accent);
  background: rgba(255, 255, 255, 0.03);
  border-radius: 12px;
  color: var(--text-light);
}

.article-shell,
body > p {
  width: 90%;
  max-width: 1000px;
  margin: 1.4rem auto;
  padding: 1.4rem 1.6rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: 0 10px 36px rgba(0, 0, 0, 0.4);
  color: var(--text-light);
  line-height: 1.75;
}

.article-shell h2,
.article-shell h3,
.article-shell h4 {
  margin: 1.2rem 0 0.6rem;
  text-align: left;
  position: relative;
  padding-left: 0.9rem;
}

.article-shell h2::before,
.article-shell h3::before,
.article-shell h4::before {
  content: '“';
  position: absolute;
  left: -2px;
  top: -6px;
  color: var(--accent);
  font-size: 1.4rem;
  line-height: 1;
  opacity: 0.8;
}

.article-shell ul,
.article-shell ol {
  padding-left: 1.3rem;
  color: var(--text-light);
}

/* Responsive */
@media (max-width: 768px) {
  .navbar .container {
    flex-direction: column;
    align-items: flex-start;
  }

  .navbar nav {
    width: 100%;
  }

  .hero {
    padding: 2.5rem 1.5rem;
  }

  section.container {
    padding: 1.8rem 1.3rem;
  }

  .popup {
    right: 0.75rem;
    left: 0.75rem;
    bottom: 1rem;
  }

  .sticky-cta {
    right: 0.75rem;
    bottom: 0.85rem;
  }
}

.accent-rail {
  margin-top: 2rem;
  background: radial-gradient(circle at 10% 20%, rgba(164, 138, 255, 0.2), transparent 35%),
    radial-gradient(circle at 90% 10%, rgba(73, 222, 255, 0.2), transparent 30%),
    linear-gradient(135deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02));
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 24px;
  padding: 2rem;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45), 0 0 40px rgba(136, 92, 255, 0.25);
}

.accent-rail__content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1.5rem;
  align-items: center;
  margin-bottom: 1.5rem;
}

.accent-rail__cta {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  align-items: flex-start;
  text-align: left;
}

.accent-rail__cta .cta-note {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.7);
}

.authority-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.75rem;
}

.authority-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1rem;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.07);
  color: #fdfdfd;
  text-decoration: none;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.15);
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.authority-pill:hover {
  transform: translateY(-2px);
  border-color: rgba(73, 222, 255, 0.6);
  background: linear-gradient(135deg, rgba(73, 222, 255, 0.14), rgba(167, 139, 250, 0.14));
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35), 0 0 16px rgba(73, 222, 255, 0.35);
}

@media (max-width: 900px) {
  .accent-rail__content {
    grid-template-columns: 1fr;
  }
  .accent-rail {
    padding: 1.5rem;
  }
}