/* ============================================================
   NovaSpark Velo — static rebuild v1.0
   Palette: black / brand red (#A6192E) / white
   Type: Oswald (display) + Inter (body) via Google Fonts
   ============================================================ */

:root {
  --red: #A6192E;
  --red-bright: #C41E36;
  --black: #0A0A0A;
  --panel: #111111;
  --line: rgba(255, 255, 255, 0.1);
  --text: #EDEDED;
  --muted: #9CA3AF;
  --maxw: 80rem;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--black);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, .display {
  font-family: 'Oswald', 'Arial Narrow', Impact, sans-serif;
  text-transform: uppercase;
  line-height: 1.05;
  font-weight: 700;
  letter-spacing: 0.01em;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--red-bright); }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 1.5rem; }

/* ---------- Header ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  background: rgba(10, 10, 10, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 4.5rem; }
.brand img { height: 2.25rem; width: auto; }
.main-nav { display: flex; align-items: center; gap: 2rem; }
.main-nav a {
  font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.12em;
  color: #D1D5DB; font-weight: 500; position: relative; padding: 0.25rem 0;
}
.main-nav a::after {
  content: ""; position: absolute; left: 0; bottom: -2px; height: 1px; width: 0;
  background: var(--red); transition: width 0.3s ease;
}
.main-nav a:hover { color: #fff; }
.main-nav a:hover::after, .main-nav a[aria-current="page"]::after { width: 100%; }
.main-nav a[aria-current="page"] { color: #fff; }
.btn {
  display: inline-block; padding: 0.65rem 1.4rem;
  background: var(--red); color: #fff;
  font-family: 'Oswald', sans-serif; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.1em; font-size: 0.85rem;
  transition: background 0.25s ease, transform 0.25s ease;
}
.btn:hover { background: var(--red-bright); color: #fff; transform: translateY(-1px); }
.btn-outline {
  background: transparent; border: 2px solid var(--red); color: var(--red-bright);
}
.btn-outline:hover { background: var(--red); color: #fff; }
.nav-toggle { display: none; background: none; border: 0; color: #fff; cursor: pointer; padding: 0.5rem; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: #fff; margin: 5px 0; transition: 0.3s; }

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 100svh;
  display: flex; align-items: center; justify-content: center; text-align: center;
  overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; }
.hero-bg::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(to bottom, rgba(0,0,0,0.6), rgba(0,0,0,0.4) 45%, rgba(0,0,0,0.85));
}
.hero-inner { position: relative; z-index: 2; padding: 6rem 1.5rem 4rem; }
.hero-logo { width: 12rem; margin: 0 auto 1.5rem; filter: drop-shadow(0 4px 30px rgba(0,0,0,0.8)); }
.hero h1 { font-size: clamp(2.6rem, 8vw, 6.5rem); font-weight: 700; }
.hero .tagline {
  margin-top: 1.25rem; font-size: clamp(1rem, 2.2vw, 1.35rem); font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.06em; max-width: 56rem; margin-inline: auto;
}
.hero .sub { margin-top: 0.75rem; color: #D1D5DB; }
.hero .btn { margin-top: 2.25rem; font-size: 1rem; padding: 1rem 2.6rem; animation: pulse-glow 2.6s infinite; }
@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(166, 25, 46, 0.55); }
  50% { box-shadow: 0 0 0 14px rgba(166, 25, 46, 0); }
}
.scroll-hint {
  position: absolute; bottom: 1.5rem; left: 50%; transform: translateX(-50%);
  color: rgba(255,255,255,0.5); font-size: 0.7rem; letter-spacing: 0.3em; text-transform: uppercase;
  z-index: 2; text-align: center;
}
.scroll-hint::after {
  content: ""; display: block; width: 1px; height: 2rem; margin: 0.5rem auto 0;
  background: linear-gradient(to bottom, rgba(255,255,255,0.5), transparent);
}

/* ---------- Sections ---------- */
.section { padding: 5.5rem 0; position: relative; }
.section-tint { background: var(--panel); }
.kicker {
  display: flex; align-items: center; gap: 0.9rem; margin-bottom: 1.25rem;
  color: var(--red-bright); font-size: 0.85rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.22em;
}
.kicker::before { content: ""; width: 3rem; height: 1px; background: var(--red); }
.section h2 { font-size: clamp(2rem, 5vw, 3.4rem); margin-bottom: 1.5rem; }
.lead { color: #D1D5DB; font-size: 1.05rem; max-width: 44rem; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 3.5rem; align-items: center; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.75rem; }
.grid-4 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.75rem; }

/* Manifesto */
.frame { position: relative; }
.frame::before, .frame::after {
  content: ""; position: absolute; width: 5rem; height: 5rem; pointer-events: none;
}
.frame::before { top: -0.75rem; left: -0.75rem; border-top: 2px solid var(--red); border-left: 2px solid var(--red); }
.frame::after { bottom: -0.75rem; right: -0.75rem; border-bottom: 2px solid var(--red); border-right: 2px solid var(--red); }
.frame img { width: 100%; height: auto; }
.badge-rot {
  position: absolute; bottom: -0.75rem; left: -0.75rem;
  background: var(--red); padding: 0.8rem 1.4rem; transform: rotate(-2deg);
  font-family: 'Oswald', sans-serif; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.08em; font-size: 0.85rem; box-shadow: 0 20px 40px rgba(0,0,0,0.5);
}
.prose p { color: #D1D5DB; margin-bottom: 1.25rem; font-size: 1.05rem; line-height: 1.75; }
.prose p strong { color: #fff; }
.signature {
  margin-top: 1.5rem; padding-top: 1.5rem; border-top: 1px solid var(--line);
  font-family: 'Oswald', sans-serif; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.06em; color: #9CA3AF;
}
.signature em { color: var(--red-bright); font-style: normal; }

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; margin-top: 2.5rem; }
.stats .num {
  font-family: 'Oswald', sans-serif; font-size: clamp(1.9rem, 4vw, 2.6rem);
  font-weight: 700; color: var(--red-bright);
}
.stats .lbl { color: var(--muted); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.14em; margin-top: 0.25rem; }

/* Kits */
.kit-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.75rem; }
.kit-card { position: relative; overflow: hidden; background: #000; border: 1px solid var(--line); }
.kit-card .thumb { aspect-ratio: 4 / 3; overflow: hidden; }
.kit-card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.7s ease; }
.kit-card:hover .thumb img { transform: scale(1.05); }
.kit-card .body { padding: 1.4rem 1.5rem 1.6rem; }
.kit-card h3 { font-size: 1.3rem; margin-bottom: 0.5rem; }
.kit-card h3 a:hover { color: var(--red-bright); }
.kit-card p { color: var(--muted); font-size: 0.95rem; }
.kit-card .arrow {
  position: absolute; top: 1rem; right: 1rem; width: 2.4rem; height: 2.4rem;
  display: grid; place-items: center; background: rgba(0,0,0,0.55); color: #fff;
  transition: background 0.25s ease;
}
.kit-card:hover .arrow { background: var(--red); }
.kit-note {
  margin-top: 2rem; text-align: center; color: var(--muted);
  text-transform: uppercase; letter-spacing: 0.14em; font-size: 0.85rem;
}
.kit-note strong { color: #fff; }

/* Tutorials */
.video-shell { position: relative; aspect-ratio: 16 / 9; background: #000; box-shadow: 0 25px 60px rgba(0,0,0,0.55); border: 1px solid var(--line); }
.video-shell iframe, .video-shell > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; border: 0; }
.check-list { list-style: none; margin: 1.75rem 0; }
.check-list li { display: flex; gap: 0.85rem; align-items: flex-start; padding: 0.55rem 0; color: #D1D5DB; }
.check-list li::before {
  content: ""; flex: 0 0 8px; height: 8px; border-radius: 50%;
  background: var(--red); margin-top: 0.55rem;
}
.tutorial-meta { display: flex; gap: 1rem; align-items: center; color: var(--red-bright); font-size: 0.85rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.12em; margin-bottom: 0.5rem; }

/* Newsletter band */
.band { text-align: center; position: relative; overflow: hidden; }
.band::before {
  content: "KITS"; position: absolute; inset: 0; display: grid; place-items: center;
  font-family: 'Oswald', sans-serif; font-weight: 700; font-size: 22vw;
  color: rgba(255, 255, 255, 0.03); letter-spacing: -0.02em; pointer-events: none;
}
.band .rule { width: 6rem; height: 1px; margin: 1.5rem auto; background: linear-gradient(to right, transparent, var(--red), transparent); }
.band h2 { font-size: clamp(1.6rem, 4vw, 2.4rem); }
.band .lead { margin: 0 auto 2rem; }
/* Brevo 订阅表单（iframe 容器）：白色卡片压在深色 band 上，圆角+投影区隔 */
.newsletter-embed { max-width: 34rem; margin: 0 auto; }
.newsletter-embed iframe {
  width: 100%; border: 0; border-radius: 8px; background: #fff;
  box-shadow: 0 12px 40px rgba(0,0,0,0.35);
}

/* Contact page */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3.5rem; }
.field { margin-bottom: 1.25rem; }
.field label { display: block; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.14em; color: var(--muted); margin-bottom: 0.45rem; }
.field input, .field textarea {
  width: 100%; background: rgba(255,255,255,0.05); border: 1px solid var(--line);
  color: #fff; padding: 0.85rem 1rem; font-size: 1rem; font-family: inherit; outline: none;
}
.field input:focus, .field textarea:focus { border-color: var(--red); }
.contact-aside p { color: #D1D5DB; margin-bottom: 1rem; }
.contact-aside a { color: var(--red-bright); }
.contact-aside .big-mail { font-family: 'Oswald', sans-serif; font-size: 1.35rem; text-transform: none; letter-spacing: 0.02em; }

/* Policy pages */
.policy { max-width: 48rem; }
.policy h2 { font-size: 1.6rem; margin: 2.25rem 0 0.75rem; }
.policy p, .policy li { color: #D1D5DB; margin-bottom: 0.9rem; }
.policy ul { padding-left: 1.25rem; }
.policy .callout { border-left: 3px solid var(--red); background: rgba(166,25,46,0.08); padding: 1rem 1.25rem; margin: 1.5rem 0; color: #E5E7EB; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding: 3.5rem 0 2rem; position: relative; overflow: hidden; }
.site-footer::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(to right, transparent, var(--red), transparent); opacity: 0.5;
}
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.4fr; gap: 2.5rem; }
.foot-brand img { height: 2.75rem; margin-bottom: 1rem; }
.foot-brand p { color: var(--muted); font-size: 0.95rem; max-width: 20rem; }
.site-footer h4 { font-family: 'Oswald', sans-serif; text-transform: uppercase; letter-spacing: 0.14em; font-size: 0.85rem; color: #fff; margin-bottom: 1rem; }
.site-footer ul { list-style: none; }
.site-footer ul li { margin-bottom: 0.55rem; }
.site-footer ul a { color: var(--muted); font-size: 0.92rem; text-transform: uppercase; letter-spacing: 0.08em; }
.site-footer ul a:hover { color: var(--red-bright); }
.socials { display: flex; gap: 0.75rem; margin-top: 1.25rem; }
.socials a {
  width: 2.6rem; height: 2.6rem; border: 1px solid var(--line); border-radius: 50%;
  display: grid; place-items: center; color: var(--muted); transition: 0.25s;
}
.socials a:hover { border-color: var(--red); background: var(--red); color: #fff; }
.foot-bottom {
  margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem;
  color: #6B7280; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.12em;
}
.foot-bottom a { color: #6B7280; }
.foot-bottom a:hover { color: #fff; }

/* Thanks page */
.thanks { min-height: 70svh; display: grid; place-items: center; text-align: center; }
.thanks h1 { font-size: clamp(2rem, 6vw, 3.5rem); margin-bottom: 1rem; }
.thanks p { color: var(--muted); margin-bottom: 2rem; }

/* Reveal animation */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero .btn { animation: none; }
  html { scroll-behavior: auto; }
}

/* Page hero (interior pages) */
.page-hero { padding: 10rem 0 4rem; position: relative; }
.page-hero h1 { font-size: clamp(2.4rem, 7vw, 5rem); }
.page-hero .lead { margin-top: 1.25rem; }

/* Responsive */
@media (max-width: 900px) {
  .grid-2, .contact-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-4, .kit-grid { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .main-nav {
    position: fixed; inset: 4.5rem 0 auto 0; flex-direction: column; align-items: flex-start;
    background: rgba(10,10,10,0.98); padding: 1.5rem; gap: 1.1rem;
    border-bottom: 1px solid var(--line);
    transform: translateY(-130%); transition: transform 0.3s ease;
  }
  .main-nav.open { transform: translateY(0); }
  .main-nav .btn { width: 100%; text-align: center; }
  .nav-toggle { display: block; }
}
@media (max-width: 560px) {
  .stats { grid-template-columns: 1fr; gap: 1.25rem; }
  .foot-grid { grid-template-columns: 1fr; }
  .badge-rot { position: static; transform: rotate(0); display: inline-block; margin-top: 1rem; }
}