/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: #f8fafc;
  background: #030712;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100dvh;
  position: relative;
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1); }
button { font-family: inherit; cursor: pointer; border: 0; background: none; }

:root {
  --accent-1: #06b6d4;
  --accent-2: #ec4899;
  --accent-3: #8b5cf6;
  --bg-primary: #030712;
  --bg-secondary: #0f172a;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.06);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.12);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-tertiary: #64748b;
  --maxw: 1280px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;
  --shadow-glow: 0 0 40px rgba(6, 182, 212, 0.15);
}

/* ===== 赛博矩阵背景 ===== */
@property --scan-pos {
  syntax: '<percentage>';
  inherits: false;
  initial-value: 0%;
}

.bg-aurora {
  position: fixed; inset: 0; z-index: -2;
  overflow: hidden; pointer-events: none;
  background: linear-gradient(180deg, #000000 0%, #030712 50%, #000000 100%);
}

/* 超强光晕 blob */
.bg-aurora .blob {
  position: absolute; border-radius: 50%; 
  filter: blur(150px); 
  opacity: 0.6;
  animation: float 30s ease-in-out infinite;
  will-change: transform;
  mix-blend-mode: screen;
}
.bg-aurora .b1 { 
  width: 800px; height: 800px; 
  background: radial-gradient(circle, var(--accent-2) 0%, transparent 70%);
  top: -300px; left: -200px; 
}
.bg-aurora .b2 { 
  width: 700px; height: 700px; 
  background: radial-gradient(circle, var(--accent-1) 0%, transparent 70%);
  bottom: -250px; right: -150px; 
  animation-delay: -10s; 
}
.bg-aurora .b3 { 
  width: 600px; height: 600px; 
  background: radial-gradient(circle, var(--accent-3) 0%, transparent 70%);
  top: 40%; left: 30%; 
  animation-delay: -20s; 
  opacity: 0.4; 
}
@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(50px, -30px) scale(1.1); }
  50% { transform: translate(-30px, 20px) scale(0.95); }
  75% { transform: translate(40px, 40px) scale(1.05); }
}

/* 透视网格 - 深度感 */
.bg-aurora .grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(6, 182, 212, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(236, 72, 153, 0.08) 1px, transparent 1px);
  background-size: 80px 80px;
  transform: perspective(500px) rotateX(60deg) translateY(-100px);
  transform-origin: center top;
  animation: gridFlow 20s linear infinite;
}
@keyframes gridFlow {
  0% { background-position: 0 0; }
  100% { background-position: 0 80px; }
}

/* 水平扫描线 */
.bg-aurora .scanline {
  position: absolute; inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent 0px,
    transparent 2px,
    rgba(6, 182, 212, 0.03) 2px,
    rgba(6, 182, 212, 0.03) 4px
  );
  pointer-events: none;
  animation: scanFlicker 4s ease-in-out infinite;
}
@keyframes scanFlicker {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.6; }
}

/* 垂直扫描光 */
.bg-aurora .scanlight {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 200px;
  background: linear-gradient(
    180deg,
    rgba(6, 182, 212, 0.15) 0%,
    rgba(236, 72, 153, 0.1) 50%,
    transparent 100%
  );
  animation: scanSweep 8s ease-in-out infinite;
  filter: blur(40px);
}
@keyframes scanSweep {
  0%, 100% { transform: translateY(-100%); }
  50% { transform: translateY(calc(100vh + 100%)); }
}

/* 粒子容器 */
#particles {
  position: fixed; inset: 0; z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

/* ===== 顶部导航 - 赛博玻璃态 ===== */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px clamp(20px, 4vw, 56px);
  backdrop-filter: blur(40px) saturate(150%);
  -webkit-backdrop-filter: blur(40px) saturate(150%);
  background: rgba(0, 0, 0, 0.5);
  border-bottom: 1px solid rgba(6, 182, 212, 0.2);
  box-shadow: 0 0 40px rgba(6, 182, 212, 0.1), inset 0 -1px 0 rgba(236, 72, 153, 0.1);
}
.logo { 
  display: inline-flex; align-items: center; gap: 10px; 
  font-weight: 600; font-size: 17px; 
  letter-spacing: -0.01em;
}
.logo-mark {
  position: relative; width: 28px; height: 28px;
}
.logo-mark .dot {
  position: absolute; width: 20px; height: 20px; border-radius: 50%;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.logo:hover .logo-mark .dot { transform: scale(1.1); }
.logo-mark .d1 { background: var(--accent-1); left: 0; top: 4px; mix-blend-mode: screen; }
.logo-mark .d2 { background: var(--accent-2); left: 8px; top: 4px; mix-blend-mode: screen; }
.logo-text em { font-style: normal; color: var(--text-secondary); font-weight: 500; margin-left: 2px; }
.nav-links { display: flex; gap: 28px; font-size: 14px; color: var(--text-secondary); }
.nav-links a { position: relative; padding: 4px 0; }
.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 2px;
  background: linear-gradient(90deg, var(--accent-1), var(--accent-2));
  border-radius: 1px;
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.nav-links a:hover { color: var(--text-primary); }
.nav-links a:hover::after { width: 100%; }

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: calc(100dvh - 72px);
  display: flex; align-items: center; justify-content: center;
  padding: 80px clamp(24px, 5vw, 80px) 100px;
}
.hero-inner { 
  max-width: 900px; 
  text-align: center; 
  position: relative;
  z-index: 1;
}
.badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 16px; border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary); 
  font-size: 13px; 
  font-weight: 500;
  margin-bottom: 28px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.badge .pulse {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent-1); 
  box-shadow: 0 0 0 0 rgba(6, 182, 212, 0.7);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(6, 182, 212, 0.7); }
  70% { box-shadow: 0 0 0 12px rgba(6, 182, 212, 0); }
  100% { box-shadow: 0 0 0 0 rgba(6, 182, 212, 0); }
}
.title {
  font-size: clamp(40px, 7.5vw, 80px);
  line-height: 1; 
  margin: 0 0 24px; 
  font-weight: 900; 
  letter-spacing: -0.04em;
  color: var(--text-primary);
  text-shadow: 
    0 0 40px rgba(255,255,255,0.1),
    0 0 80px rgba(6, 182, 212, 0.2),
    0 0 120px rgba(236, 72, 153, 0.1);
  animation: titleGlow 4s ease-in-out infinite alternate;
}
@keyframes titleGlow {
  0% { text-shadow: 0 0 40px rgba(255,255,255,0.1), 0 0 80px rgba(6, 182, 212, 0.2); }
  100% { text-shadow: 0 0 60px rgba(255,255,255,0.15), 0 0 100px rgba(236, 72, 153, 0.25); }
}
.grad {
  background: linear-gradient(135deg, var(--accent-1) 0%, var(--accent-2) 35%, var(--accent-3) 70%, var(--accent-1) 100%);
  background-size: 300% 300%;
  -webkit-background-clip: text; 
  background-clip: text; 
  color: transparent;
  animation: gradientShift 5s ease infinite;
  filter: drop-shadow(0 0 30px rgba(6, 182, 212, 0.4));
}
@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}
.emoji { 
  display: inline-block; 
  transform: translateY(-4px);
  animation: floatEmoji 3s ease-in-out infinite;
}
@keyframes floatEmoji {
  0%, 100% { transform: translateY(-4px) rotate(0deg); }
  50% { transform: translateY(-12px) rotate(5deg); }
}
.subtitle {
  color: var(--text-secondary); 
  font-size: clamp(15px, 1.8vw, 19px);
  max-width: 680px; 
  margin: 0 auto 36px; 
  line-height: 1.75;
  font-weight: 400;
}
.cta { 
  display: flex; 
  flex-wrap: wrap; 
  gap: 16px; 
  justify-content: center; 
  margin-bottom: 20px;
}
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 14px 28px; 
  border-radius: var(--radius-full); 
  font-weight: 600; 
  font-size: 15px;
  letter-spacing: -0.01em;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}
.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transform: translateX(-100%);
  transition: transform 0.6s;
}
.btn:hover::before { transform: translateX(100%); }
.btn-primary {
  color: #ffffff;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2), var(--accent-3));
  background-size: 200% 200%;
  animation: btnGradient 3s ease infinite;
  box-shadow: 
    0 0 20px rgba(6, 182, 212, 0.4),
    0 0 40px rgba(236, 72, 153, 0.3),
    0 8px 32px -8px rgba(0, 0, 0, 0.5);
  position: relative;
  overflow: hidden;
}
@keyframes btnGradient {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}
.btn-primary::before {
  content: "";
  position: absolute;
  inset: -2px;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2), var(--accent-3));
  border-radius: inherit;
  z-index: -1;
  filter: blur(15px);
  opacity: 0.7;
  animation: btnGlow 2s ease-in-out infinite alternate;
}
@keyframes btnGlow {
  0% { opacity: 0.5; filter: blur(10px); }
  100% { opacity: 0.8; filter: blur(20px); }
}
.btn-primary:hover { 
  transform: translateY(-4px) scale(1.05); 
  box-shadow: 
    0 0 30px rgba(6, 182, 212, 0.6),
    0 0 60px rgba(236, 72, 153, 0.5),
    0 16px 48px -12px rgba(0, 0, 0, 0.6);
}
.btn-ghost {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-medium);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}
.contact-inline {
  display: inline-flex; align-items: center; gap: 10px;
  margin-top: 20px; 
  padding: 10px 18px; 
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.04); 
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary); 
  font-size: 14px;
  font-weight: 500;
  transition: all 0.25s ease;
}
.contact-inline:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--border-medium);
}
.contact-inline svg { color: var(--accent-1); }
.contact-inline .wx-copy {
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  -webkit-background-clip: text; 
  background-clip: text; 
  color: transparent;
  border: 0; 
  padding: 0; 
  font-weight: 700; 
  font-size: 14px;
  position: relative;
}
.contact-inline .wx-copy::after {
  content: "";
  position: absolute;
  bottom: -2px; left: 0;
  width: 100%; height: 1px;
  background: linear-gradient(90deg, var(--accent-1), var(--accent-2));
  opacity: 0.5;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}
.contact-inline .wx-copy:hover::after { transform: scaleX(1); }
/* scroll-hint 已移除 (taste-skill 9.F: 禁止滚动提示) */

/* ===== Section 通用 ===== */
.section-head { 
  text-align: center; 
  margin-bottom: 56px; 
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}
.section-head h2 {
  font-size: clamp(32px, 5vw, 52px); 
  font-weight: 800; 
  margin: 0 0 14px;
  letter-spacing: -0.025em;
  line-height: 1.1;
}
.section-head p { 
  color: var(--text-secondary); 
  margin: 0;
  font-size: 16px;
  line-height: 1.6;
}

/* ===== 卡片区 ===== */
.cards-section {
  max-width: var(--maxw); 
  margin: 0 auto;
  padding: 80px clamp(24px, 5vw, 64px) 60px;
}
.cards {
  display: grid; 
  gap: 20px;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}
.card {
  position: relative; 
  display: flex; flex-direction: column; 
  padding: 28px;
  min-height: 240px; 
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, rgba(255,255,255,0.04), rgba(255,255,255,0.01));
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid transparent;
  background-origin: border-box;
  background-clip: padding-box, border-box;
  background-image: 
    linear-gradient(135deg, rgba(255,255,255,0.04), rgba(255,255,255,0.01)),
    linear-gradient(135deg, rgba(6, 182, 212, 0.3), rgba(236, 72, 153, 0.3), rgba(139, 92, 246, 0.3));
  overflow: hidden; 
  isolation: isolate;
  cursor: pointer;
  transform-style: preserve-3d;
  perspective: 1000px;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), 
              box-shadow 0.4s ease;
}
.card::before {
  content: "";
  position: absolute; inset: -2px;
  border-radius: inherit;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2), var(--accent-3));
  z-index: -2;
  opacity: 0;
  filter: blur(20px);
  transition: opacity 0.4s ease;
}
.card::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(
    105deg,
    transparent 0%,
    rgba(255,255,255,0.1) 30%,
    transparent 60%
  );
  transform: translateX(-100%);
  transition: transform 0.6s ease;
  pointer-events: none;
}
.card:hover {
  transform: translateY(-8px) rotateX(2deg) rotateY(-2deg) scale(1.02);
  box-shadow: 
    0 25px 60px -20px rgba(0, 0, 0, 0.6),
    0 0 40px rgba(6, 182, 212, 0.2),
    0 0 80px rgba(236, 72, 153, 0.1);
}
.card:hover::before { opacity: 0.5; }
.card:hover::after { transform: translateX(100%); }
.card .icon {
  width: 56px; height: 56px; 
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center; 
  font-size: 28px;
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.2), rgba(236, 72, 153, 0.2));
  border: 1px solid rgba(6, 182, 212, 0.3);
  margin-bottom: 20px;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}
.card .icon::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.2), transparent 60%);
  opacity: 0;
  transition: opacity 0.3s ease;
}
.card:hover .icon { 
  transform: scale(1.1) rotate(-5deg);
  box-shadow: 0 0 30px rgba(6, 182, 212, 0.4);
  border-color: rgba(6, 182, 212, 0.6);
}
.card:hover .icon::before { opacity: 1; }
.card h3 {
  font-size: 20px; 
  font-weight: 700; 
  margin: 0 0 10px; 
  line-height: 1.35;
  letter-spacing: -0.015em;
  color: var(--text-primary);
}
.card p {
  color: var(--text-secondary); 
  font-size: 14px; 
  line-height: 1.65;
  margin: 0 0 20px; 
  flex: 1;
}
.card .go {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 14px; 
  font-weight: 600;
  background: linear-gradient(90deg, var(--accent-1), var(--accent-2));
  -webkit-background-clip: text; 
  background-clip: text; 
  color: transparent;
  align-self: flex-start;
}
.card .go::after {
  content: "→"; 
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  background: linear-gradient(90deg, var(--accent-1), var(--accent-2));
  -webkit-background-clip: text; 
  background-clip: text; 
  color: transparent;
}
.card:hover .go::after { transform: translateX(6px); }
.card .num {
  position: absolute; 
  top: 24px; right: 24px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 12px; 
  font-weight: 700;
  letter-spacing: 0.1em;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 8px rgba(6, 182, 212, 0.5));
  opacity: 0.8;
  transition: all 0.3s ease;
}
.card:hover .num {
  opacity: 1;
  filter: drop-shadow(0 0 12px rgba(6, 182, 212, 0.8));
  transform: scale(1.1);
}

/* ===== 关于 ===== */
.about {
  max-width: 880px; 
  margin: 40px auto 0;
  padding: 80px clamp(24px, 5vw, 64px) 100px; 
  text-align: center;
}
.about h2 { 
  font-size: clamp(32px, 5vw, 48px); 
  margin: 0 0 20px; 
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.15;
}
.about p { 
  color: var(--text-secondary); 
  line-height: 1.8; 
  margin: 0 0 32px; 
  font-size: 16px;
}
.tags {
  display: flex; flex-wrap: wrap; gap: 10px; 
  justify-content: center; 
  margin-bottom: 40px;
}
.tags span {
  padding: 8px 16px; 
  border-radius: var(--radius-full); 
  font-size: 13px;
  font-weight: 500;
  background: var(--bg-card); 
  border: 1px solid var(--border-subtle); 
  color: var(--text-secondary);
  transition: all 0.25s ease;
}
.tags span:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-medium);
  color: var(--text-primary);
}

/* ===== 联系卡片 ===== */
.contact-card {
  display: flex; align-items: center; justify-content: space-between; 
  gap: 24px;
  padding: 32px 36px; 
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.06), rgba(236, 72, 153, 0.06));
  border: 1px solid var(--border-subtle);
  text-align: left;
  position: relative; overflow: hidden;
}
.contact-card::before {
  content: ""; 
  position: absolute; inset: 0;
  background: radial-gradient(500px 250px at 0% 0%, rgba(6, 182, 212, 0.14), transparent 60%),
              radial-gradient(500px 250px at 100% 100%, rgba(236, 72, 153, 0.14), transparent 60%);
  pointer-events: none;
}
.contact-card-left { position: relative; z-index: 1; }
.contact-title { 
  font-size: 20px; 
  font-weight: 700; 
  margin-bottom: 6px;
  letter-spacing: -0.015em;
  color: var(--text-primary);
}
.contact-desc { color: var(--text-secondary); font-size: 14px; }
.contact-card-right { position: relative; z-index: 1; text-align: right; }
.contact-label { 
  display: block; 
  font-size: 12px; 
  color: var(--text-tertiary); 
  margin-bottom: 8px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 500;
}
.wx-copy.big {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px; 
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  color: #030712; 
  border: 0; 
  font-weight: 700; 
  font-size: 15px;
  box-shadow: 0 12px 30px -10px rgba(236, 72, 153, 0.55);
  transition: transform 0.2s ease, box-shadow 0.25s ease;
}
.wx-copy.big:hover { 
  transform: translateY(-2px); 
  box-shadow: 0 18px 40px -10px rgba(236, 72, 153, 0.7); 
}
.copy-ico { font-style: normal; font-size: 14px; opacity: 0.8; }

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 32px clamp(24px, 5vw, 64px);
  color: var(--text-tertiary); 
  font-size: 13px;
}
.footer-row {
  max-width: var(--maxw); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between; 
  gap: 16px; flex-wrap: wrap;
}
.footer p { margin: 0; }
.footer-wx .wx-copy {
  background: linear-gradient(90deg, var(--accent-1), var(--accent-2));
  -webkit-background-clip: text; 
  background-clip: text; 
  color: transparent;
  border: 0; padding: 0; 
  font-weight: 600; 
  font-size: 13px;
}
.footer-beian {
  max-width: var(--maxw);
  margin: 12px auto 0;
  text-align: center;
}
.footer-beian a {
  color: var(--text-tertiary);
  font-size: 12px;
  text-decoration: none;
  transition: color 0.2s ease;
}
.footer-beian a:hover {
  color: var(--text-secondary);
}

/* ===== 浮动微信按钮 ===== */
.fab-wx {
  position: fixed; right: 24px; bottom: 28px; z-index: 100;
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 20px; 
  border-radius: var(--radius-full); border: 0;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  color: #030712; 
  font-weight: 700; 
  font-size: 14px;
  letter-spacing: -0.01em;
  box-shadow: 0 16px 36px -10px rgba(236, 72, 153, 0.6);
  transition: transform 0.2s ease, box-shadow 0.25s ease;
}
.fab-wx:hover { 
  transform: translateY(-3px); 
  box-shadow: 0 22px 44px -10px rgba(236, 72, 153, 0.8); 
}

/* ===== Toast ===== */
.toast {
  position: fixed; left: 50%; bottom: 100px; 
  transform: translateX(-50%) translateY(20px);
  padding: 12px 24px; 
  border-radius: var(--radius-full);
  background: rgba(15, 15, 30, 0.92); 
  color: var(--text-primary); 
  font-size: 14px; 
  font-weight: 600;
  border: 1px solid var(--border-medium);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  opacity: 0; pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
  z-index: 200;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ===== 响应式 ===== */
@media (max-width: 720px) {
  .nav { padding: 16px 20px; }
  .nav-links { gap: 18px; font-size: 13px; }
  .hero { min-height: auto; padding: 64px 20px 96px; }
  .cards-section { padding: 64px 20px 48px; }
  .cards { grid-template-columns: 1fr; gap: 14px; }
  .card { min-height: 200px; padding: 24px; }
  .card:hover {
    transform: translateY(-4px) scale(1.01);
  }
  .features-section { padding: 64px 20px 48px; }
  .features-grid { gap: 16px; }
  .feature-card { padding: 24px 20px; }
  .cert-section { padding: 48px 20px; }
  .cert-grid { gap: 12px; }
  .cert-item { padding: 12px 18px; }
  .testimonials-section { padding: 64px 20px 80px; }
  .testimonials-grid { grid-template-columns: 1fr; gap: 20px; }
  .testimonial-card { padding: 28px 24px; }
  .about { padding: 64px 20px 80px; }
  .contact-card { 
    flex-direction: column; 
    align-items: flex-start; 
    text-align: left;
    padding: 24px;
    gap: 20px;
  }
  .contact-card-right { text-align: left; width: 100%; }
  .footer-row { flex-direction: column; align-items: flex-start; }
  .fab-wx span { display: none; }
  .fab-wx { padding: 14px; }
  /* 移动端简化粒子和背景 */
  .bg-aurora .blob { filter: blur(100px); opacity: 0.4; }
  .bg-aurora .grid { opacity: 0.3; }
  .bg-aurora .scanlight { animation-duration: 12s; }
  #particles { opacity: 0.6; }
}
@media (max-width: 380px) {
  .title { font-size: 38px; }
  .btn { padding: 12px 22px; font-size: 14px; }
}

/* ===== 入场动画 ===== */
.reveal { 
  opacity: 0; 
  transform: translateY(28px); 
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), 
              transform 0.7s cubic-bezier(0.16, 1, 0.3, 1); 
}
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}
/* ==================================
   内容模态框
   ================================== */
.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}
.modal.show {
  opacity: 1;
  visibility: visible;
}
.modal::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(3, 7, 18, 0.78);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
}
.modal-card {
  position: relative;
  width: 100%;
  max-width: 720px;
  max-height: calc(100vh - 40px);
  background: rgba(15, 23, 42, 0.92);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  display: flex;
  flex-direction: column;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5);
  transform: translateY(20px) scale(0.96);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}
.modal.show .modal-card {
  transform: translateY(0) scale(1);
}
.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 26px 18px;
  border-bottom: 1px solid var(--border-subtle);
}
.modal-head h2 {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin: 0;
}
.modal-close {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  border: none;
  color: rgba(255, 255, 255, 0.7);
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: 0.2s;
}
.modal-close:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
}
.modal-body {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.8);
}
.modal-body::-webkit-scrollbar {
  width: 6px;
}
.modal-body::-webkit-scrollbar-track {
  background: transparent;
}
.modal-body::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 3px;
}
.modal-body h3 {
  color: #fff;
  font-size: 1.15rem;
  font-weight: 600;
  margin: 24px 0 12px;
}
.modal-body h3:first-child {
  margin-top: 0;
}
.modal-body h4 {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1rem;
  font-weight: 600;
  margin: 18px 0 8px;
}
.modal-body p {
  margin: 0 0 14px;
}
.modal-body ul {
  margin: 0 0 14px;
  padding-left: 22px;
}
.modal-body li {
  margin: 6px 0;
}
.modal-body ol {
  margin: 0 0 14px;
  padding-left: 22px;
}
.modal-body .wx-tip {
  margin-top: 24px;
  padding: 16px 20px;
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.08), rgba(236, 72, 153, 0.08));
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.95rem;
}
.modal-body .wx-tip strong {
  color: var(--accent-1);
  font-weight: 700;
}
.modal-foot {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 18px 26px 22px;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.9rem;
}
.modal-foot .wx-copy.small {
  padding: 7px 14px;
  font-size: 0.85rem;
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.14), rgba(236, 72, 153, 0.14));
  border: 1px solid rgba(6, 182, 212, 0.25);
  border-radius: var(--radius-full);
  color: var(--accent-1);
  cursor: pointer;
  transition: all 0.2s ease;
}
.modal-foot .wx-copy.small:hover {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.22), rgba(236, 72, 153, 0.22));
  transform: translateY(-1px);
}

/* 手机端适配 */
@media (max-width: 720px) {
  .modal {
    padding: 0;
  }
  .modal-card {
    max-height: 100vh;
    border-radius: 0;
  }
  .modal-head {
    padding: 18px 20px 14px;
  }
  .modal-head h2 {
    font-size: 1.2rem;
  }
  .modal-body {
    padding: 20px;
  }
  .modal-foot {
    padding: 14px 20px 18px;
    flex-direction: column;
    gap: 8px;
  }
}

/* ===== 核心特性 ===== */
.features-section {
  padding: 100px clamp(24px, 5vw, 80px) 80px;
  max-width: 1280px;
  margin: 0 auto;
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin-top: 48px;
}
.feature-card {
  background: linear-gradient(135deg, rgba(255,255,255,0.04), rgba(255,255,255,0.01));
  border: 1px solid rgba(6, 182, 212, 0.2);
  border-radius: var(--radius-xl);
  padding: 32px 28px;
  text-align: center;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-1), var(--accent-2), var(--accent-3));
  transform: scaleX(0);
  transition: transform 0.4s ease;
}
.feature-card:hover {
  transform: translateY(-8px);
  border-color: rgba(6, 182, 212, 0.4);
  box-shadow: 0 20px 50px -20px rgba(6, 182, 212, 0.2);
}
.feature-card:hover::before {
  transform: scaleX(1);
}
.feature-icon {
  font-size: 48px;
  margin-bottom: 20px;
  filter: drop-shadow(0 0 20px rgba(6, 182, 212, 0.4));
}
.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 12px;
  color: var(--text-primary);
}
.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* ===== 资质认证 ===== */
.cert-section {
  padding: 80px clamp(24px, 5vw, 80px);
  max-width: 1280px;
  margin: 0 auto;
  background: radial-gradient(ellipse at center, rgba(6, 182, 212, 0.05) 0%, transparent 70%);
}
.cert-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
  margin-top: 48px;
}
.cert-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 24px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  transition: all 0.3s ease;
}
.cert-item:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(6, 182, 212, 0.3);
  transform: scale(1.05);
}
.cert-icon {
  font-size: 20px;
}
.cert-text {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
}

/* ===== 客户评价 ===== */
.testimonials-section {
  padding: 80px clamp(24px, 5vw, 80px) 100px;
  max-width: 1280px;
  margin: 0 auto;
}
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
  margin-top: 48px;
}
.testimonial-card {
  background: linear-gradient(135deg, rgba(236, 72, 153, 0.06), rgba(139, 92, 246, 0.04));
  border: 1px solid rgba(236, 72, 153, 0.2);
  border-radius: var(--radius-xl);
  padding: 36px 32px;
  position: relative;
  transition: all 0.4s ease;
}
.testimonial-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 50px -20px rgba(236, 72, 153, 0.2);
  border-color: rgba(236, 72, 153, 0.4);
}
.testimonial-quote {
  font-size: 64px;
  line-height: 1;
  color: var(--accent-2);
  opacity: 0.4;
  font-family: Georgia, serif;
  margin-bottom: -20px;
}
.testimonial-card p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin: 0 0 24px;
}
.testimonial-author {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.testimonial-author strong {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
}
.testimonial-author span {
  font-size: 13px;
  color: var(--accent-1);
  font-weight: 500;
}