/**
 * 花样生活科技 - 企业官网样式
 * 视觉：AI 感青紫 accent + 玻璃质感；基底为柔和蓝灰（避免纯黑压抑）
 * 响应式：移动端优先断点扩展
 */

:root {
  /* 柔和深灰蓝基底（比纯黑更亮，仍适合深色 UI） */
  --bg-deep: #282f42;
  --bg-elevated: #323b52;
  --surface-glass: rgba(255, 255, 255, 0.1);
  --surface-glass-strong: rgba(255, 255, 255, 0.16);
  /* AI 感accent：青、紫、电蓝 */
  --accent-cyan: #22d3ee;
  --accent-cyan-dim: rgba(34, 211, 238, 0.12);
  --accent-violet: #a78bfa;
  --accent-violet-dim: rgba(167, 139, 250, 0.12);
  --accent-blue: #60a5fa;
  --glow-cyan: rgba(34, 211, 238, 0.45);
  --glow-violet: rgba(167, 139, 250, 0.35);
  /* 边框与分割线 */
  --border-subtle: rgba(255, 255, 255, 0.14);
  --border-glow: rgba(34, 211, 238, 0.35);
  /* 文字 */
  --color-text: #f8fafc;
  --color-text-sub: #b4c2d4;
  --color-muted: #8a9bb0;
  /* 布局 */
  --header-h: 64px;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow-soft: 0 0 48px rgba(34, 211, 238, 0.12), 0 20px 40px rgba(18, 22, 38, 0.22);
  --shadow-card: 0 4px 28px rgba(18, 22, 38, 0.18);
  --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --transition: 0.25s ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--bg-deep);
  -webkit-font-smoothing: antialiased;
}

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

/* 内容宽度 */
.container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}

@media (min-width: 768px) {
  .container {
    padding: 0 32px;
  }
}

/* ----- 顶部导航 ----- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(40, 47, 66, 0.78);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  border-bottom: 1px solid var(--border-subtle);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

@media (min-width: 768px) {
  .header-inner {
    justify-content: flex-start;
  }
}

.brand {
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: 0.04em;
  background: linear-gradient(105deg, var(--color-text) 0%, var(--accent-cyan) 55%, var(--accent-violet) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  text-decoration: none;
  transition: filter var(--transition), opacity var(--transition);
}

.brand:hover {
  filter: brightness(1.15);
}

.brand:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 4px;
  border-radius: 4px;
}

/* ----- Hero ----- */
.hero {
  position: relative;
  padding: 48px 0 56px;
  overflow: hidden;
}

@media (min-width: 768px) {
  .hero {
    padding: 72px 0 80px;
  }
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 100% 85% at 50% -15%, rgba(34, 211, 238, 0.2), transparent 58%),
    radial-gradient(ellipse 75% 55% at 88% 38%, rgba(167, 139, 250, 0.16), transparent 52%),
    radial-gradient(ellipse 55% 50% at 8% 72%, rgba(96, 165, 250, 0.14), transparent 48%),
    radial-gradient(ellipse 90% 45% at 50% 108%, rgba(255, 255, 255, 0.06), transparent 55%),
    linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-elevated) 50%, var(--bg-deep) 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 40px;
  align-items: center;
}

@media (min-width: 900px) {
  .hero-content {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 48px;
  }

  .hero-text {
    flex: 1;
    max-width: 520px;
  }

  .hero-art {
    flex: 0 0 42%;
    max-width: 420px;
  }
}

.hero-tag {
  display: inline-block;
  margin: 0 0 12px;
  padding: 6px 14px;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
  background: var(--accent-cyan-dim);
  border: 1px solid rgba(34, 211, 238, 0.22);
  border-radius: 999px;
  box-shadow: 0 0 24px rgba(34, 211, 238, 0.08);
}

.hero-title {
  margin: 0 0 16px;
  font-size: clamp(1.875rem, 5vw, 2.75rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.02em;
  background: linear-gradient(120deg, #f8fafc 0%, #e2e8f0 35%, var(--accent-cyan) 70%, var(--accent-violet) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.hero-lead {
  margin: 0 0 12px;
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-text-sub);
}

.hero-idea {
  margin: 0;
  font-size: 1rem;
  color: var(--color-muted);
}

.hero-svg {
  width: 100%;
  height: auto;
  max-height: 280px;
  filter: drop-shadow(0 0 28px rgba(34, 211, 238, 0.15)) drop-shadow(0 0 40px rgba(167, 139, 250, 0.12));
}

/* ----- 通用区块 ----- */
.section {
  padding: 56px 0;
  position: relative;
}

@media (min-width: 768px) {
  .section {
    padding: 72px 0;
  }
}

.section-title {
  margin: 0 0 20px;
  font-size: clamp(1.5rem, 4vw, 1.875rem);
  font-weight: 700;
  text-align: center;
  color: var(--color-text);
}

.intro {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.05) 0%, rgba(167, 139, 250, 0.07) 50%, rgba(255, 255, 255, 0.05) 100%);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-lead {
  margin: 0 auto;
  max-width: 720px;
  font-size: 1.0625rem;
  color: var(--color-text-sub);
  text-align: center;
}

.section-sub {
  margin: -8px 0 28px;
  text-align: center;
  font-size: 0.9375rem;
  color: var(--color-muted);
}

/* ----- APP 二维码卡片 ----- */
.app-teaser {
  position: relative;
  background: var(--bg-deep);
}

.app-teaser::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  transform: translateX(-50%);
  width: min(90%, 520px);
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-glow), transparent);
  opacity: 0.6;
  pointer-events: none;
}

.qr-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  margin: 0 auto;
  padding: 28px 32px 32px;
  max-width: 320px;
  width: 100%;
  font: inherit;
  color: inherit;
  cursor: pointer;
  background: var(--surface-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition:
    transform var(--transition),
    box-shadow var(--transition),
    border-color var(--transition);
}

.qr-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-soft), 0 0 40px rgba(34, 211, 238, 0.06);
  border-color: rgba(34, 211, 238, 0.35);
}

.qr-card:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 3px;
}

.qr-frame {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 160px;
  height: 160px;
  background: linear-gradient(145deg, rgba(55, 65, 90, 0.55), rgba(34, 211, 238, 0.1));
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
}

.qr-grid {
  position: relative;
  display: block;
  width: 120px;
  height: 120px;
  background: rgba(40, 48, 68, 0.88);
  border-radius: 8px;
  box-shadow: inset 0 0 0 1px var(--border-subtle);
}

.qr-corner {
  position: absolute;
  width: 28px;
  height: 28px;
  border: 3px solid var(--accent-cyan);
  border-radius: 4px;
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.35);
}

.qr-c1 {
  top: 12px;
  left: 12px;
}

.qr-c2 {
  top: 12px;
  right: 12px;
}

.qr-c3 {
  bottom: 12px;
  left: 12px;
}

.qr-dots {
  position: absolute;
  inset: 48px 12px 12px 48px;
  background-image:
    linear-gradient(rgba(241, 245, 249, 0.35) 2px, transparent 2px),
    linear-gradient(90deg, rgba(241, 245, 249, 0.35) 2px, transparent 2px);
  background-size: 10px 10px;
  opacity: 0.35;
}

.qr-label {
  font-weight: 600;
  font-size: 1.0625rem;
  color: var(--color-text);
}

.qr-hint {
  font-size: 0.875rem;
  color: var(--color-muted);
}

/* ----- 页脚 ----- */
.site-footer {
  padding: 28px 0;
  background: #222838;
  border-top: 1px solid var(--border-subtle);
  color: rgba(255, 255, 255, 0.78);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-align: center;
}

.copyright {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.5;
}

.footer-icp {
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.5;
}

.footer-link {
  color: rgba(34, 211, 238, 0.88);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.footer-link:hover {
  color: var(--accent-cyan);
  border-bottom-color: rgba(34, 211, 238, 0.45);
}

.footer-link:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ----- 模态提示 ----- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(30, 36, 52, 0.55);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
}

.modal-backdrop.is-open {
  opacity: 1;
  visibility: visible;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 201;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
}

.modal.is-open {
  pointer-events: auto;
  opacity: 1;
  visibility: visible;
}

.modal-panel {
  width: 100%;
  max-width: 360px;
  padding: 28px 24px 24px;
  background: linear-gradient(160deg, rgba(48, 56, 78, 0.95), rgba(38, 44, 62, 0.97));
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card), 0 0 64px rgba(34, 211, 238, 0.08);
  text-align: center;
}

.modal-title {
  margin: 0 0 12px;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
}

.modal-body {
  margin: 0 0 24px;
  font-size: 1rem;
  color: var(--color-text-sub);
}

.modal-close {
  display: inline-block;
  padding: 10px 28px;
  font: inherit;
  font-weight: 600;
  color: #0a0a0f;
  background: linear-gradient(105deg, var(--accent-cyan), var(--accent-blue));
  border: none;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: 0 0 24px rgba(34, 211, 238, 0.25);
  transition: filter var(--transition), box-shadow var(--transition);
}

.modal-close:hover {
  filter: brightness(1.08);
  box-shadow: 0 0 32px rgba(34, 211, 238, 0.35);
}

.modal-close:focus-visible {
  outline: 2px solid var(--accent-violet);
  outline-offset: 2px;
}