:root {
  --bg: #f7f7fb;
  --fg: #14161f;
  --muted: #5d6470;
  --accent: #6d5cff;
  --accent2: #00c2a8;
  --accent3: #ff5c8a;
  --card: rgba(255, 255, 255, 0.72);
  --border: rgba(20, 22, 31, 0.09);
  --code-bg: rgba(20, 22, 31, 0.05);
  --shadow: 0 18px 50px -18px rgba(31, 27, 92, 0.28);
  --glow: 0 0 0 1px rgba(109, 92, 255, 0.25), 0 12px 40px -12px rgba(109, 92, 255, 0.45);
}

[data-theme="dark"] {
  --bg: #0a0c14;
  --fg: #eaecf5;
  --muted: #98a0b3;
  --accent: #8b7bff;
  --accent2: #14e0c2;
  --accent3: #ff7ba3;
  --card: rgba(22, 25, 38, 0.72);
  --border: rgba(234, 236, 245, 0.1);
  --code-bg: rgba(234, 236, 245, 0.07);
  --shadow: 0 18px 50px -18px rgba(0, 0, 0, 0.6);
  --glow: 0 0 0 1px rgba(139, 123, 255, 0.3), 0 12px 40px -12px rgba(139, 123, 255, 0.5);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ── animated aurora backdrop ─────────────────────────────── */
.aurora {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}
.aurora span {
  position: absolute;
  width: 55vmax;
  height: 55vmax;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.35;
  animation: drift 26s ease-in-out infinite alternate;
}
.aurora span:nth-child(1) { background: var(--accent); top: -18vmax; left: -12vmax; }
.aurora span:nth-child(2) { background: var(--accent2); bottom: -20vmax; right: -14vmax; animation-delay: -8s; animation-duration: 32s; }
.aurora span:nth-child(3) { background: var(--accent3); top: 38%; left: 52%; animation-delay: -16s; animation-duration: 38s; opacity: 0.22; }
[data-theme="dark"] .aurora span { opacity: 0.28; }

@keyframes drift {
  0%   { transform: translate3d(0, 0, 0) scale(1); }
  50%  { transform: translate3d(6vmax, -4vmax, 0) scale(1.15); }
  100% { transform: translate3d(-5vmax, 5vmax, 0) scale(0.95); }
}

@media (prefers-reduced-motion: reduce) {
  .aurora span { animation: none; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ── layout ───────────────────────────────────────────────── */
.wrap { max-width: 780px; margin: 0 auto; padding: 0 1.4rem; }

.site-head {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  background: color-mix(in srgb, var(--bg) 65%, transparent);
  border-bottom: 1px solid var(--border);
}
.head-wrap { display: flex; justify-content: space-between; align-items: center; padding-top: 0.85rem; padding-bottom: 0.85rem; }
.brand {
  font-weight: 900;
  font-size: 1.18rem;
  letter-spacing: -0.02em;
  text-decoration: none;
  background: linear-gradient(90deg, var(--accent), var(--accent2), var(--accent3), var(--accent));
  background-size: 300% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: hueSlide 9s linear infinite;
}
@keyframes hueSlide { to { background-position: 300% 0; } }

nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 1.1rem;
  font-size: 0.93rem;
  font-weight: 600;
  transition: color 0.2s ease;
}
nav a:hover { color: var(--accent); }

/* ── hero ─────────────────────────────────────────────────── */
.hero { margin: 3.2rem 0 2.4rem; text-align: center; }
.hero .eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  border-radius: 999px;
  padding: 0.25rem 0.9rem;
  margin-bottom: 1rem;
  animation: popIn 0.7s cubic-bezier(0.2, 0.9, 0.3, 1.4) both;
}
.hero h1 {
  font-size: clamp(2.1rem, 5.5vw, 3.1rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
  margin: 0 0 0.7rem;
  background: linear-gradient(100deg, var(--fg) 40%, var(--accent) 70%, var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: popIn 0.8s 0.08s cubic-bezier(0.2, 0.9, 0.3, 1.3) both;
}
.hero .dek { color: var(--muted); font-size: 1.13rem; margin: 0 auto; max-width: 560px; animation: popIn 0.8s 0.16s both; }

@keyframes popIn {
  from { opacity: 0; transform: translateY(18px) scale(0.98); }
  to   { opacity: 1; transform: none; }
}

/* ── post cards ───────────────────────────────────────────── */
.posts { list-style: none; padding: 0; margin: 0 0 3.5rem; display: grid; gap: 1.15rem; }
.card {
  background: var(--card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.28s cubic-bezier(0.2, 0.8, 0.3, 1.1), box-shadow 0.28s ease, border-color 0.28s ease;
}
.card:hover {
  transform: translateY(-5px) scale(1.008);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  box-shadow: var(--glow), var(--shadow);
}
.card a.thumb { display: block; overflow: hidden; }
.card a.thumb img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.3, 1);
}
.card:hover a.thumb img { transform: scale(1.05); }
.card-body { padding: 1.15rem 1.4rem 1.25rem; }
.card h2 { margin: 0 0 0.4rem; font-size: 1.3rem; line-height: 1.3; letter-spacing: -0.015em; }
.card a { color: inherit; text-decoration: none; }
.card a:hover h2 {
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.card .dek { color: var(--muted); margin: 0 0 0.55rem; font-size: 0.97rem; }
.card .meta { color: var(--muted); font-size: 0.83rem; margin: 0; }
.card .meta .tag { color: var(--accent); font-weight: 600; }

/* ── article ──────────────────────────────────────────────── */
article { padding: 2.6rem 0 3rem; }
.kicker {
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  margin: 0 0 0.6rem;
}
article h1 {
  font-size: clamp(1.85rem, 4.6vw, 2.5rem);
  line-height: 1.18;
  letter-spacing: -0.025em;
  margin: 0 0 0.6rem;
  animation: popIn 0.7s both;
}
.dek { color: var(--muted); font-size: 1.13rem; margin: 0 0 1.6rem; }
.hero-img {
  width: 100%;
  aspect-ratio: 16 / 8;
  object-fit: cover;
  border-radius: 20px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  margin: 0 0 2rem;
}
article h2 {
  font-size: 1.5rem;
  margin: 2.3rem 0 0.85rem;
  letter-spacing: -0.015em;
  position: relative;
  padding-left: 0.9rem;
}
article h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.3em;
  bottom: 0.3em;
  width: 4px;
  border-radius: 4px;
  background: linear-gradient(180deg, var(--accent), var(--accent2));
}
article p { margin: 0 0 1.15rem; }
article ul, article ol { padding-left: 1.45rem; margin: 0 0 1.15rem; }
article li { margin-bottom: 0.45rem; }
article a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
article blockquote {
  margin: 1.3rem 0;
  padding: 0.7rem 1.2rem;
  border-left: 3px solid var(--accent);
  background: var(--card);
  border-radius: 0 12px 12px 0;
  color: var(--muted);
}
article code {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0.1rem 0.36rem;
  font-size: 0.88em;
}

/* scroll-reveal targets */
section, .aff-box, .takeaway { opacity: 0; transform: translateY(22px); transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.2, 0.8, 0.3, 1); }
section.in, .aff-box.in, .takeaway.in { opacity: 1; transform: none; }
.no-js section, .no-js .aff-box, .no-js .takeaway { opacity: 1; transform: none; }

/* ── faq ──────────────────────────────────────────────────── */
.faq details {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0.85rem 1.2rem;
  margin-bottom: 0.7rem;
  transition: border-color 0.2s ease;
}
.faq details[open] { border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.faq summary { cursor: pointer; font-weight: 700; }

/* ── takeaway + affiliate ─────────────────────────────────── */
.takeaway {
  background: linear-gradient(120deg, color-mix(in srgb, var(--accent) 12%, var(--card)), color-mix(in srgb, var(--accent2) 12%, var(--card)));
  border: 1px solid color-mix(in srgb, var(--accent) 25%, var(--border));
  border-radius: 18px;
  padding: 0.5rem 1.4rem 1rem;
  margin: 2.2rem 0;
}
.aff-box {
  background: var(--card);
  backdrop-filter: blur(14px);
  border: 1px dashed color-mix(in srgb, var(--accent) 40%, var(--border));
  border-radius: 18px;
  padding: 1.1rem 1.4rem;
  margin: 2.2rem 0;
}
.aff-box h3 { margin: 0 0 0.6rem; font-size: 1.06rem; }
.aff-box ul { list-style: none; padding: 0; margin: 0 0 0.6rem; }
.aff-box li { margin-bottom: 0.4rem; }
.aff-box a { font-weight: 700; }
.aff-box .why { color: var(--muted); font-size: 0.92rem; }
.aff-note { color: var(--muted); font-size: 0.82rem; margin: 0; }

/* ── footer ───────────────────────────────────────────────── */
.site-foot {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
  padding: 1.6rem 0 2.6rem;
  margin-top: 2rem;
}

/* theme toggle button */
.theme-btn {
  position: fixed;
  bottom: 1.1rem;
  right: 1.1rem;
  width: 2.7rem;
  height: 2.7rem;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--card);
  backdrop-filter: blur(10px);
  color: var(--fg);
  cursor: pointer;
  font-size: 1.15rem;
  z-index: 60;
  transition: transform 0.25s cubic-bezier(0.2, 0.9, 0.3, 1.4), box-shadow 0.25s ease;
}
.theme-btn:hover { transform: scale(1.12) rotate(14deg); box-shadow: var(--glow); }

@media (max-width: 640px) {
  .hero { margin-top: 2.2rem; }
  .card-body { padding: 1rem 1.1rem 1.1rem; }
}