/* ==========================================================================
   光环科技 · Echo 官网共享样式
   浅色模式 · 极简 · 流式记忆美学
   ========================================================================== */

/* ---------- 设计令牌 ---------- */
:root {
  /* 背景色 */
  --bg-primary: #FFFFFF;
  --bg-warm: #F8F6F3;
  --bg-warm-2: #F9F7F4;
  --bg-card: #FFFFFF;

  /* 文字 */
  --text-primary: #1A1A1A;
  --text-secondary: #6B6B6B;
  --text-tertiary: #9A9A9A;

  /* 强调色 —— 流式光晕 */
  --accent-gold: #C9A961;
  --accent-gold-soft: #E8D9B5;
  --accent-blue: #7BA7D9;
  --accent-blue-soft: #C7DBF0;
  --accent-flow: linear-gradient(110deg, #C9A961 0%, #7BA7D9 100%);

  /* 线与面 */
  --border: rgba(26, 26, 26, 0.08);
  --border-strong: rgba(26, 26, 26, 0.14);
  --shadow-soft: 0 4px 24px rgba(26, 26, 26, 0.05);
  --shadow-card: 0 12px 48px rgba(26, 26, 26, 0.07);
  --shadow-lift: 0 24px 64px rgba(26, 26, 26, 0.10);

  /* 尺寸 */
  --nav-height: 72px;
  --max-width: 1180px;
  --radius: 14px;
  --radius-lg: 24px;

  /* 缓动 */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-slow: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- 重置 ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display',
    'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-weight: 400;
  overflow-x: hidden;
}

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

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

/* ---------- 排版 ---------- */
.display,
h1,
h2,
h3 {
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.12;
  color: var(--text-primary);
}

h1 {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
}

h2 {
  font-size: clamp(1.8rem, 3.8vw, 2.8rem);
}

h3 {
  font-size: clamp(1.2rem, 2vw, 1.5rem);
}

.lead {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: var(--text-secondary);
  font-weight: 400;
  line-height: 1.75;
}

.muted {
  color: var(--text-secondary);
}

.accent-text {
  background: var(--accent-flow);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ---------- 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

.section {
  padding: clamp(72px, 12vw, 140px) 0;
}

.section-tight {
  padding: clamp(56px, 8vw, 96px) 0;
}

.bg-warm {
  background: var(--bg-warm);
}

.bg-warm-2 {
  background: var(--bg-warm-2);
}

/* ---------- 顶部导航 ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.4s var(--ease), background 0.4s var(--ease);
}

.nav.scrolled {
  border-bottom-color: var(--border);
  background: rgba(255, 255, 255, 0.88);
}

.nav-inner {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.nav-logo .logo-mark {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.nav-logo .logo-sub {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-tertiary);
  letter-spacing: 0.04em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  display: inline-block;
  padding: 8px 16px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 999px;
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
}

.nav-links a:hover {
  color: var(--text-primary);
  background: rgba(26, 26, 26, 0.04);
}

.nav-links a.active {
  color: var(--text-primary);
}

.nav-cta {
  position: relative;
  padding: 9px 20px !important;
  font-weight: 600 !important;
  color: #fff !important;
  background: var(--text-primary);
  border-radius: 999px;
  overflow: hidden;
}

.nav-cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--accent-flow);
  opacity: 0;
  transition: opacity 0.4s var(--ease);
}

.nav-cta:hover {
  background: var(--text-primary);
  color: #fff;
}

.nav-cta:hover::before {
  opacity: 0.85;
}

.nav-cta span {
  position: relative;
  z-index: 1;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 40px;
  height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  font-size: 0.98rem;
  font-weight: 600;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease),
    background 0.25s var(--ease);
  font-family: inherit;
}

.btn-primary {
  background: var(--text-primary);
  color: #fff;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
}

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
}

.btn-ghost:hover {
  background: var(--bg-warm);
  border-color: var(--text-primary);
}

.btn-arrow {
  transition: transform 0.25s var(--ease);
}

.btn:hover .btn-arrow {
  transform: translateX(4px);
}

/* ---------- 流式光晕眼镜（首页 Hero 核心） ---------- */
.glasses-hero {
  width: min(420px, 80vw);
  height: auto;
  margin: 0 auto;
  display: block;
}

.glasses-hero .lens-flow {
  animation: flowShift 6s var(--ease-slow) infinite alternate;
}

@keyframes flowShift {
  0% {
    transform: translateX(-8%);
    opacity: 0.55;
  }
  100% {
    transform: translateX(8%);
    opacity: 0.9;
  }
}

.glasses-hero .lens-glow {
  animation: pulseGlow 4s ease-in-out infinite;
  transform-origin: center;
}

@keyframes pulseGlow {
  0%,
  100% {
    opacity: 0.4;
  }
  50% {
    opacity: 0.85;
  }
}

/* ---------- 滚动淡入 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s var(--ease-slow), transform 0.9s var(--ease-slow);
  will-change: opacity, transform;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 {
  transition-delay: 0.12s;
}
.reveal-delay-2 {
  transition-delay: 0.24s;
}
.reveal-delay-3 {
  transition-delay: 0.36s;
}
.reveal-delay-4 {
  transition-delay: 0.48s;
}

/* ---------- 卡片 ---------- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease),
    border-color 0.4s var(--ease);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
  border-color: var(--border-strong);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--accent-gold-soft), var(--accent-blue-soft));
}

.card h3 {
  margin-bottom: 14px;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.98rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

/* ---------- 场景卡片（产品页） ---------- */
.scenario-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 44px 36px 40px;
  overflow: hidden;
  transition: transform 0.45s var(--ease), box-shadow 0.45s var(--ease);
}

.scenario-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-flow);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s var(--ease);
}

.scenario-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-card);
}

.scenario-card:hover::after {
  transform: scaleX(1);
}

.scenario-num {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--accent-gold);
  text-transform: uppercase;
  margin-bottom: 18px;
  display: block;
}

.scenario-visual {
  width: 100%;
  height: 180px;
  border-radius: var(--radius);
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.scenario-card h3 {
  margin-bottom: 14px;
}

.scenario-card p {
  color: var(--text-secondary);
  font-size: 0.98rem;
}

/* ---------- 对比图（理念页） ---------- */
.contrast-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

.contrast-side {
  padding: 56px 44px;
  min-height: 340px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.contrast-noise {
  background: #EFEBE6;
  position: relative;
}

.contrast-calm {
  background: var(--bg-warm-2);
}

.contrast-label {
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 16px;
}

/* ---------- 长文引言 ---------- */
.pull-quote {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  max-width: 820px;
}

/* ---------- 表单 ---------- */
.form-field {
  margin-bottom: 20px;
}

.form-field label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 16px 20px;
  font-size: 1rem;
  font-family: inherit;
  color: var(--text-primary);
  background: var(--bg-primary);
  border: 1.5px solid var(--border-strong);
  border-radius: var(--radius);
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
  outline: none;
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--text-primary);
  box-shadow: 0 0 0 4px rgba(26, 26, 26, 0.06);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.7;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-tertiary);
}

/* ---------- 邮件订阅（页脚/首页底） ---------- */
.subscribe-row {
  display: flex;
  gap: 12px;
  max-width: 460px;
}

.subscribe-row .form-input {
  flex: 1;
}

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--border);
  padding: 64px 0 48px;
  background: var(--bg-primary);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 48px;
  flex-wrap: wrap;
}

.footer-brand {
  max-width: 320px;
}

.footer-brand p {
  color: var(--text-tertiary);
  font-size: 0.9rem;
  margin-top: 12px;
}

.footer-links {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
}

.footer-col h4 {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 16px;
}

.footer-col a {
  display: block;
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
  transition: color 0.2s var(--ease);
}

.footer-col a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.84rem;
  color: var(--text-tertiary);
}

/* ---------- 成功提示 ---------- */
.form-success {
  display: none;
  padding: 18px 22px;
  background: linear-gradient(135deg, var(--accent-gold-soft), var(--accent-blue-soft));
  border-radius: var(--radius);
  font-size: 0.98rem;
  color: var(--text-primary);
  align-items: flex-start;
  gap: 12px;
}

.form-success.show {
  display: flex;
  animation: fadeUp 0.5s var(--ease);
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 大字 Coming Soon ---------- */
.coming-headline {
  font-size: clamp(3.5rem, 12vw, 8rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 0.95;
  background: var(--accent-flow);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ---------- 硬件规格条 ---------- */
.spec-row {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}

.spec-row:last-child {
  border-bottom: none;
}

.spec-value {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.spec-label {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ---------- 分隔线装饰 ---------- */
.divider-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-flow);
  margin: 0 auto;
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .grid-3 {
    grid-template-columns: 1fr;
  }
  .grid-2 {
    grid-template-columns: 1fr;
  }
  .contrast-wrap {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    padding: 16px 24px 28px;
    gap: 4px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.4s var(--ease), opacity 0.4s var(--ease);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-links a {
    padding: 14px 16px;
    font-size: 1rem;
  }

  .nav-toggle {
    display: flex;
  }

  .container {
    padding: 0 22px;
  }

  .subscribe-row {
    flex-direction: column;
  }

  .footer-inner {
    flex-direction: column;
  }
}

/* ---------- 减少动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}