/* ============================================
   NEXUS AI News Feed — Styles
   Aesthetic: Futuristic Editorial
   ============================================ */

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

:root {
  --bg-deep: #050810;
  --bg-surface: rgba(12, 18, 35, 0.6);
  --bg-card: rgba(10, 14, 30, 0.55);
  --bg-card-hover: rgba(18, 24, 48, 0.65);
  --border-card: rgba(100, 180, 255, 0.08);
  --border-card-hover: rgba(100, 180, 255, 0.25);
  --border-glow: rgba(80, 200, 255, 0.15);
  --text-primary: #e4eaf2;
  --text-secondary: rgba(200, 215, 235, 0.65);
  --text-meta: rgba(150, 175, 210, 0.5);
  --accent: #4cc2ff;
  --accent-secondary: #00e5a0;
  --accent-warm: #ff9f43;
  --font-serif: 'IBM Plex Serif', Georgia, serif;
  --font-sans: 'IBM Plex Sans', -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
  --radius: 16px;
  --radius-sm: 8px;
  --max-width: 1280px;
  --transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-deep);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- Noise Texture --- */
.noise {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
}

/* --- Animated Background Orbs --- */
.orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.25;
  z-index: 0;
  pointer-events: none;
}

.orb-1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, #1a5fff 0%, transparent 70%);
  top: -150px; left: -100px;
  animation: drift-1 25s ease-in-out infinite alternate;
}

.orb-2 {
  width: 450px; height: 450px;
  background: radial-gradient(circle, #00c9a7 0%, transparent 70%);
  top: 40%; right: -120px;
  animation: drift-2 30s ease-in-out infinite alternate;
}

.orb-3 {
  width: 350px; height: 350px;
  background: radial-gradient(circle, #7b2fff 0%, transparent 70%);
  bottom: -80px; left: 30%;
  animation: drift-3 20s ease-in-out infinite alternate;
}

@keyframes drift-1 { to { transform: translate(120px, 80px) scale(1.15); } }
@keyframes drift-2 { to { transform: translate(-100px, -60px) scale(0.9); } }
@keyframes drift-3 { to { transform: translate(80px, -100px) scale(1.1); } }

/* --- Header --- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  background: rgba(5, 8, 16, 0.7);
  border-bottom: 1px solid var(--border-card);
}

.header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.logo__icon {
  font-size: 1.1rem;
  color: var(--accent);
  animation: spin-glow 4s linear infinite;
}

@keyframes spin-glow {
  0%, 100% { transform: rotate(0deg); filter: drop-shadow(0 0 4px var(--accent)); }
  50% { transform: rotate(180deg); filter: drop-shadow(0 0 12px var(--accent)); }
}

.logo__text {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--text-primary);
}

.logo__tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-meta);
  letter-spacing: 0.05em;
  padding-left: 0.6rem;
  border-left: 1px solid var(--border-card);
}

.nav__count {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-meta);
}

/* --- Hero --- */
.hero {
  position: relative;
  z-index: 2;
  padding: 5rem 2rem 3rem;
  text-align: center;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(80, 200, 255, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero__inner {
  max-width: 720px;
  margin: 0 auto;
}

.hero__title {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.05;
  margin-bottom: 1rem;
  position: relative;
}

.hero__title-line {
  display: block;
  font-size: clamp(3.5rem, 8vw, 6.5rem);
  color: var(--text-primary);
  opacity: 0;
  animation: reveal-line 0.8s ease-out forwards;
}

.hero__title-line--accent {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-secondary) 50%, var(--accent-warm) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation-delay: 0.15s;
}

@keyframes reveal-line {
  from { opacity: 0; transform: translateY(30px) scale(0.96); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.hero__subtitle {
  font-size: 1rem;
  font-weight: 300;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
  margin-bottom: 2.5rem;
  opacity: 0;
  animation: fade-up 0.6s ease-out 0.4s forwards;
}

@keyframes fade-up {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --- Search --- */
.search {
  position: relative;
  max-width: 480px;
  margin: 0 auto;
  opacity: 0;
  animation: fade-up 0.6s ease-out 0.6s forwards;
}

.search__prompt {
  position: absolute;
  left: 1.2rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent);
  z-index: 2;
}

.search__input {
  width: 100%;
  padding: 0.9rem 1.2rem 0.9rem 2.6rem;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 12px;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  outline: none;
  transition: var(--transition);
}

.search__input::placeholder {
  color: var(--text-meta);
}

.search__input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(76, 194, 255, 0.08), 0 0 30px rgba(76, 194, 255, 0.06);
  background: var(--bg-card-hover);
}

/* --- Main --- */
.main {
  position: relative;
  z-index: 2;
  padding: 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

/* --- Feed Grid --- */
.feed {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.25rem;
}

/* --- Card --- */
.card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  opacity: 0;
  transform: translateY(30px);
  animation: card-enter 0.5s ease-out forwards;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-card-hover);
  transform: translateY(-4px);
  box-shadow:
    0 8px 40px rgba(76, 194, 255, 0.06),
    0 0 0 1px rgba(76, 194, 255, 0.1);
}

/* Gradient border top accent */
.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), var(--accent-secondary), transparent);
  opacity: 0;
  transition: opacity 0.35s ease;
}

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

.card__image {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: rgba(20, 28, 50, 0.5);
}

.card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
  opacity: 0.88;
}

.card:hover .card__image img {
  transform: scale(1.04);
  opacity: 1;
}

.card__image--gen {
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  transition: transform 0.5s ease;
}

.card:hover .card__image--gen {
  transform: scale(1.04);
}

.card__image--img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
  opacity: 0.88;
}

.card:hover .card__image--img {
  transform: scale(1.04);
  opacity: 1;
}

.card__image--fallback {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
}

.card__image--placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(20, 28, 50, 0.8), rgba(30, 40, 70, 0.6));
  font-family: var(--font-serif);
  font-size: 2.5rem;
  color: rgba(76, 194, 255, 0.15);
}

.card__body {
  padding: 1.25rem 1.35rem 1.35rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.card__image {
  display: none;
}

.card__source {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-meta);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.card__source-dot {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 6px var(--accent);
  flex-shrink: 0;
}

.card__title {
  font-family: var(--font-serif);
  font-size: 1.08rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color 0.25s ease;
}

.card:hover .card__title {
  color: var(--accent);
}

.card__summary {
  font-size: 0.82rem;
  font-weight: 300;
  line-height: 1.65;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-card);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-meta);
}

.card__arrow {
  font-size: 0.8rem;
  transition: transform 0.25s ease;
  color: var(--text-meta);
}

.card:hover .card__arrow {
  transform: translateX(4px);
  color: var(--accent);
}

@keyframes card-enter {
  to { opacity: 1; transform: translateY(0); }
}

/* --- Empty State --- */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  color: var(--text-secondary);
  font-style: italic;
}

/* --- Footer --- */
.footer {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 3rem 2rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-meta);
  letter-spacing: 0.05em;
  border-top: 1px solid var(--border-card);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .hero { padding: 3rem 1.5rem 2rem; }
  .hero__title-line { font-size: clamp(2.8rem, 10vw, 4rem); }
  .feed { grid-template-columns: 1fr; gap: 1rem; }
  .header__inner { padding: 0 1.2rem; }
  .logo__tag { display: none; }
  .main { padding: 1rem; }
}

@media (max-width: 420px) {
  .hero__title-line { font-size: 2.4rem; }
  .hero__subtitle { font-size: 0.85rem; }
  .card__body { padding: 1rem 1.1rem 1.1rem; }
}

/* --- Scanline overlay on hero (subtle) --- */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(76, 194, 255, 0.008) 2px,
    rgba(76, 194, 255, 0.008) 4px
  );
  pointer-events: none;
}

/* --- Selection --- */
::selection {
  background: rgba(76, 194, 255, 0.25);
  color: #fff;
}

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb {
  background: rgba(76, 194, 255, 0.2);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(76, 194, 255, 0.35); }

/* --- Highlight match in search --- */
mark {
  background: rgba(76, 194, 255, 0.2);
  color: var(--accent);
  border-radius: 2px;
  padding: 0 2px;
}