:root {
  --color-bg: #FFFFFF;
  --color-surface: #FFFFFF;
  --color-text-primary: #1F2933;
  --color-text-secondary: #4B5563;
  --color-border: #E8E8E8;
  --color-primary: #5BB98C;
  --color-primary-pressed: #30A46C;
  /* iOS overlay button palette (light) */
  --overlay-btn-bg: rgba(255,255,255,0.92);
  --overlay-btn-fg: #1F2933;
  --overlay-btn-border: rgba(232,232,232,0.6);
  --overlay-btn-shadow-opacity: 0.18;

  /* Reusable layout gaps */
  --overlay-action-left-gap: var(--space-md);
  --overlay-action-gap-to-title: var(--space-sm);

  /* Overlay paddings used in shared discovery */
  --overlay-padding-x: 28px;
  --overlay-padding-bottom: 28px;

  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;

  --radius-md: 12px;
  --radius-lg: 16px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #080A15;
    --color-surface: #0E1221;
    --color-text-primary: #FFFFFF;
    --color-text-secondary: rgba(255,255,255,0.85);
    --color-border: #2E2E2E;
    --color-primary: #236E4A;
    --color-primary-pressed: #1B543A;
    /* iOS overlay button palette (dark) */
    --overlay-btn-bg: rgba(0,0,0,0.6);
    --overlay-btn-fg: #FFFFFF;
    --overlay-btn-border: rgba(255,255,255,0.2);
    --overlay-btn-shadow-opacity: 0.3;
  }
}

html, body { background: var(--color-bg); color: var(--color-text-primary); }

.brand-hero {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}
.btn-primary {
  display: inline-block; text-decoration: none; font-weight: 600;
  background: var(--color-primary); color: #fff; padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
}
.btn-primary:hover { background: var(--color-primary-pressed); }

/* Discovery page */
.discovery-root { max-width: 720px; margin: 0 auto; padding: var(--space-xl) var(--space-lg); }
.discovery-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 6px 16px rgba(0,0,0,0.06);
  overflow: hidden;
}


.placeholder { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: var(--space-xl); text-align: center; color: var(--color-text-secondary); }

/* Loading animation */
.loading-center { min-height: 100vh; display: grid; place-items: center; }
.loading-logo { width: 120px; height: auto; animation: logo-pulse 1.6s ease-in-out infinite; }
@keyframes logo-pulse {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.08); }
  100% { transform: scale(1); }
}

@media (prefers-reduced-motion: reduce) {
  .loading-logo { animation: none; }
}

/* Sticky header for shared pages */
.share-header {
  position: fixed; top: 0; left: 0; right: 0; height: 56px;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 16px; z-index: 1000;
  background: color-mix(in srgb, var(--color-surface), transparent 8%);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: saturate(1.2) blur(8px);
}
.share-header .brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--color-text-primary); }
.share-header .brand img { height: 28px; width: auto; display: block; }
.share-header .brand span { font-weight: 700; }
.share-header .cta { text-decoration: none; font-weight: 600; padding: 8px 12px; border-radius: 999px; background: var(--color-primary); color: #fff; }
.share-header .cta:hover { background: var(--color-primary-pressed); }
.with-sticky-header { padding-top: 64px; }
.loading-with-header { min-height: calc(100vh - 64px); display: grid; place-items: center; }

/* Hero header overlay (match iOS look) */
.hero-image-wrapper { position: relative; }
.hero-image { display: block; width: 100%; height: auto; }
.hero-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  pointer-events: none; /* allow image taps */
}
.hero-overlay-gradient {
  background: linear-gradient(
    to top,
    rgba(8,10,21,0.94) 0%,
    rgba(8,10,21,0.88) 40%,
    rgba(8,10,21,0.70) 70%,
    rgba(8,10,21,0.40) 85%,
    rgba(8,10,21,0.00) 100%
  );
  padding: var(--overlay-action-gap-to-title) var(--overlay-padding-x) var(--overlay-padding-bottom) var(--overlay-padding-x);
}
.hero-overlay-content { color: #fff; text-align: center; max-width: 960px; margin: 0 auto; }
.hero-title { font-size: 30px; font-weight: 800; margin: 0 0 6px; }
.hero-submeta { font-size: 16px; opacity: 0.92; margin-bottom: 10px; }
.hero-short { font-size: 15px; opacity: 0.95; }
.hero-actions {
  display: flex; align-items: center; gap: 8px;
  align-self: flex-start;
  margin-left: var(--overlay-action-left-gap);
  margin-bottom: 0;
  padding: 0;
}
.hero-action {
  pointer-events: auto;
  background: var(--overlay-btn-bg);
  color: var(--overlay-btn-fg);
  border: 1px solid var(--overlay-btn-border);
  border-radius: 999px; width: 56px; height: 56px;
  display: inline-flex; align-items: center; justify-content: center;
  text-decoration: none; box-shadow: 0 8px 24px rgba(0,0,0,var(--overlay-btn-shadow-opacity));
  backdrop-filter: saturate(1.2) blur(8px);
  cursor: pointer;
}
.hero-action:hover { filter: brightness(1.05); }
.hero-action svg { width: 28px; height: 28px; }

/* Full description */
.discovery-body { padding: 0 var(--space-lg) var(--space-xl); }
.discovery-description { color: var(--color-text-secondary); font-size: 1rem; line-height: 1.55; white-space: normal; }
.discovery-description p { margin: 0 0 1em; }
.discovery-description a { color: var(--color-primary); text-decoration: underline; }
.discovery-description h1, .discovery-description h2, .discovery-description h3,
.discovery-description h4, .discovery-description h5, .discovery-description h6 {
  color: var(--color-text-primary); margin: 1.25em 0 .5em; line-height: 1.25;
}
.discovery-description h1 { font-size: 1.6rem; }
.discovery-description h2 { font-size: 1.4rem; }
.discovery-description h3 { font-size: 1.2rem; }
.discovery-description ul, .discovery-description ol { padding-left: 1.2em; margin: 0 0 1em; }
.discovery-description code { background: rgba(127,127,127,0.15); padding: 0 .25em; border-radius: 4px; color: inherit; }

/* Fullscreen image viewer */
.image-viewer {
  position: fixed; inset: 0; background: rgba(0,0,0,0.95);
  display: none; align-items: center; justify-content: center; z-index: 9999;
}
.image-viewer.open { display: flex; }
.image-viewer img { max-width: 95vw; max-height: 90vh; width: auto; height: auto; border-radius: 12px; }
.image-viewer .close-btn {
  position: absolute; top: 16px; right: 16px;
  background: rgba(255,255,255,0.15); color: #fff; border: none; border-radius: 999px;
  padding: 8px 12px; font-weight: 700; cursor: pointer;
}
.image-viewer .close-btn:hover { background: rgba(255,255,255,0.22); }