/* ============ 基础变量 / 重置 / 公共件 ============ */
:root {
  --ink: #05060d;
  --ink-2: #0b1022;
  --panel: rgba(18, 24, 45, 0.78);
  --panel-strong: rgba(20, 26, 48, 0.94);
  --line: rgba(132, 158, 255, 0.26);
  --white: #f7fbff;
  --muted: #b6bdd4;
  --blue: #1f2be3;
  --cyan: #3fe7ff;
  --lime: #b6ff3d;
  --violet: #8958ff;
  --magenta: #ff4bb7;
  --radius: 8px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 0;
  scroll-snap-type: y mandatory;
  background: var(--ink);
}

/* JS 接管滚动后关闭原生 snap，使用自定义缓动 */
html.fx-on {
  scroll-behavior: auto;
  scroll-snap-type: none;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
  font-family: "Noto Sans SC", system-ui, sans-serif;
  color: var(--white);
  background:
    radial-gradient(circle at 18% 8%, rgba(31, 43, 227, 0.22), transparent 34rem),
    radial-gradient(circle at 82% 24%, rgba(63, 231, 255, 0.14), transparent 28rem),
    var(--ink);
  -webkit-font-smoothing: antialiased;
}

body.menu-open,
body.modal-open {
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

img {
  display: block;
  max-width: 100%;
}

.stage-section {
  position: relative;
  min-height: 100svh;
  overflow: hidden;
  scroll-snap-align: start;
  scroll-snap-stop: always;
}

.stage-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  user-select: none;
  pointer-events: none;
}

.section-shell {
  position: relative;
  z-index: 2;
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto;
}

.eyebrow {
  font-family: "Saira Condensed", sans-serif;
  font-size: 15px;
  font-style: italic;
  font-weight: 800;
  letter-spacing: 0.15em;
  color: var(--cyan);
}

.hero-copy h1,
.copy-panel h2,
.modal-panel h2 {
  font-size: clamp(42px, 7vw, 92px);
  line-height: 0.95;
  font-weight: 900;
  text-shadow:
    2px 2px 0 rgba(255, 75, 183, 0.65),
    -2px 0 0 rgba(63, 231, 255, 0.5),
    0 0 22px rgba(63, 231, 255, 0.28);
}

.hero-copy p:not(.eyebrow),
.copy-panel p,
.footer-brand p,
.footer-contact p,
.footer-notice p {
  color: var(--muted);
  line-height: 1.75;
}

.submit-btn {
  border: 0;
  border-radius: var(--radius);
  cursor: pointer;
  background: linear-gradient(100deg, var(--blue), var(--cyan));
  color: var(--white);
  font-weight: 900;
  box-shadow: 0 0 24px rgba(63, 231, 255, 0.26);
  transition: transform 0.18s ease, filter 0.18s ease;
}

.submit-btn:hover {
  transform: translateY(-2px);
  filter: brightness(1.08);
}

.submit-btn:disabled {
  cursor: not-allowed;
  filter: saturate(0.75) brightness(0.82);
  transform: none;
}

/* ============ 通用进场（滚动触发 reveal） ============ */
[data-reveal] {
  opacity: 0;
  transform: translateY(36px);
  transition:
    opacity 0.8s var(--ease-out),
    transform 0.8s var(--ease-out);
  transition-delay: var(--rd, 0s);
}

[data-reveal="left"] {
  transform: translateX(-52px);
}

[data-reveal="right"] {
  transform: translateX(52px);
}

.in-view [data-reveal],
[data-reveal].in-view {
  opacity: 1;
  transform: none;
}