/* ============================================================
   铭赞网络 Twitter Ads - 全局样式
   ============================================================ */

/* ---------- Reset & Base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}
body {
  margin: 0;
  font-family:
    "Inter",
    "PingFang SC",
    "Microsoft YaHei",
    -apple-system,
    BlinkMacSystemFont,
    sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
}
img,
svg {
  max-width: 100%;
  display: block;
}
a {
  color: inherit;
  text-decoration: none;
  transition:
    color 0.2s ease,
    opacity 0.2s ease;
}
button {
  font: inherit;
  cursor: pointer;
  background: none;
  border: 0;
  color: inherit;
}
ul,
ol {
  list-style: none;
  margin: 0;
  padding: 0;
}
h1,
h2,
h3,
h4,
h5 {
  margin: 0;
  line-height: 1.2;
  font-family: "Manrope", "PingFang SC", sans-serif;
  font-weight: 700;
  letter-spacing: -0.01em;
}
p {
  margin: 0;
}

/* ---------- Design Tokens ---------- */
:root {
  /* Color */
  --c-bg: #050810;
  --c-bg-2: #0a0f1e;
  --c-surface: #0f172a;
  --c-surface-2: #131c30;
  --c-border: rgba(148, 163, 184, 0.12);
  --c-border-2: rgba(148, 163, 184, 0.22);

  --c-text: #f1f5f9;
  --c-text-2: #94a3b8;
  --c-text-3: #64748b;

  --c-primary: #1da1f2;
  --c-primary-2: #0ea5e9;
  --c-primary-3: #38bdf8;
  --c-accent: #06b6d4;
  --c-success: #10b981;
  --c-warning: #f59e0b;

  /* Gradients */
  --g-primary: linear-gradient(135deg, #1da1f2 0%, #0ea5e9 50%, #06b6d4 100%);
  --g-primary-soft: linear-gradient(
    135deg,
    rgba(29, 161, 242, 0.18) 0%,
    rgba(14, 165, 233, 0.06) 100%
  );
  --g-text: linear-gradient(135deg, #1da1f2 0%, #38bdf8 50%, #67e8f9 100%);
  --g-border: linear-gradient(
    135deg,
    rgba(29, 161, 242, 0.5),
    rgba(6, 182, 212, 0.15),
    rgba(29, 161, 242, 0)
  );
  --g-card: linear-gradient(
    160deg,
    rgba(29, 161, 242, 0.06) 0%,
    rgba(15, 23, 42, 0.4) 100%
  );

  /* Shadows */
  --sh-1: 0 2px 8px rgba(0, 0, 0, 0.3);
  --sh-2: 0 8px 24px rgba(0, 0, 0, 0.35);
  --sh-3: 0 16px 48px rgba(29, 161, 242, 0.18);
  --sh-glow: 0 0 32px rgba(29, 161, 242, 0.35);

  /* Radius */
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-xl: 28px;
  --r-full: 999px;

  /* Spacing & sizing */
  --container: 1280px;
  --pad-x: 24px;
  --header-h: 72px;

  /* Motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  position: relative;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.grad-text {
  background: var(--g-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--r-full);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.01em;
  transition:
    transform 0.25s var(--ease),
    box-shadow 0.25s var(--ease),
    background 0.25s var(--ease),
    color 0.25s var(--ease);
  white-space: nowrap;
  cursor: pointer;
  border: 1px solid transparent;
}
.btn-sm {
  padding: 9px 18px;
  font-size: 14px;
}
.btn-lg {
  padding: 15px 28px;
  font-size: 16px;
}
.btn-primary {
  background: var(--g-primary);
  color: #fff;
  box-shadow: 0 8px 24px rgba(29, 161, 242, 0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(29, 161, 242, 0.5);
}
.btn-ghost {
  background: rgba(255, 255, 255, 0.04);
  color: var(--c-text);
  border: 1px solid var(--c-border-2);
  backdrop-filter: blur(8px);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--c-primary);
  transform: translateY(-2px);
}

/* ============================================================
   HEADER + HERO (一体化)
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(5, 8, 16, 0);
  backdrop-filter: blur(0);
  border-bottom: 1px solid transparent;
  transition:
    background 0.3s var(--ease),
    backdrop-filter 0.3s var(--ease),
    border-color 0.3s var(--ease);
}
.site-header.is-scrolled {
  background: rgba(5, 8, 16, 0.78);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--c-border);
}
.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 32px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}
.brand-logo {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.brand-r {
  position: absolute;
  top: -4px;
  right: -6px;
  font-size: 9px;
  font-weight: 700;
  color: #fff;
  background: var(--c-primary);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1.5px solid var(--c-bg);
  line-height: 1;
}
.brand-text {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 17px;
  font-weight: 700;
}
.brand-name {
  font-family: "Manrope", "PingFang SC", sans-serif;
  color: var(--c-text);
  letter-spacing: 0.02em;
}
.brand-sep {
  color: var(--c-text-3);
  font-weight: 300;
  font-size: 16px;
}
.brand-tag {
  font-family: "Manrope", sans-serif;
  background: var(--g-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.primary-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}
.primary-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-link {
  display: inline-block;
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--c-text-2);
  border-radius: var(--r-sm);
  transition: color 0.2s ease, background 0.2s ease;
  position: relative;
  white-space: nowrap;
}
.nav-link:hover {
  color: var(--c-text);
}
.nav-link.active {
  color: var(--c-primary-3);
}
.nav-link.active::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 2px;
  height: 2px;
  border-radius: 2px;
  background: var(--g-primary);
}

.header-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}
.phone-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--c-text-2);
  border: 1px solid var(--c-border);
  border-radius: var(--r-full);
  background: rgba(255, 255, 255, 0.02);
  transition: all 0.2s ease;
}
.phone-pill:hover {
  color: var(--c-primary-3);
  border-color: var(--c-primary);
  background: rgba(29, 161, 242, 0.06);
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--r-sm);
  border: 1px solid var(--c-border);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
}
.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition:
    transform 0.2s ease,
    opacity 0.2s ease;
}
.menu-toggle.is-open span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.menu-toggle.is-open span:nth-child(2) {
  opacity: 0;
}
.menu-toggle.is-open span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.mobile-menu {
  display: none;
  position: absolute;
  top: var(--header-h);
  left: 0;
  right: 0;
  background: rgba(5, 8, 16, 0.96);
  backdrop-filter: blur(18px);
  padding: 16px var(--pad-x) 24px;
  border-bottom: 1px solid var(--c-border);
  flex-direction: column;
  gap: 6px;
  transform-origin: top;
  z-index: 99;
}
.mobile-menu:not([hidden]) {
  display: flex;
  animation: menuIn 0.25s var(--ease);
}
.mobile-menu a {
  display: block;
  padding: 12px 14px;
  font-size: 15px;
  color: var(--c-text-2);
  border-radius: var(--r-sm);
  transition:
    background 0.2s ease,
    color 0.2s ease;
}
.mobile-menu a:hover {
  background: rgba(255, 255, 255, 0.04);
  color: var(--c-text);
}
.mobile-menu .m-phone {
  color: var(--c-primary-3);
  font-weight: 600;
}
.mobile-menu .btn {
  margin-top: 8px;
  justify-content: center;
}
@keyframes menuIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  padding-top: calc(var(--header-h) + 40px);
  padding-bottom: 80px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background:
    radial-gradient(
      ellipse 80% 60% at 50% 0%,
      rgba(29, 161, 242, 0.12) 0%,
      transparent 60%
    ),
    radial-gradient(
      ellipse 60% 40% at 80% 100%,
      rgba(6, 182, 212, 0.08) 0%,
      transparent 60%
    ),
    var(--c-bg);
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(29, 161, 242, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(29, 161, 242, 0.06) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(
    ellipse 70% 70% at 50% 30%,
    #000 0%,
    transparent 80%
  );
  -webkit-mask-image: radial-gradient(
    ellipse 70% 70% at 50% 30%,
    #000 0%,
    transparent 80%
  );
  opacity: 0.6;
}
.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
}
.hero-glow-1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(
    circle,
    rgba(29, 161, 242, 0.4) 0%,
    transparent 70%
  );
  top: -200px;
  right: -200px;
  animation: float 14s ease-in-out infinite;
}
.hero-glow-2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(
    circle,
    rgba(6, 182, 212, 0.3) 0%,
    transparent 70%
  );
  bottom: -150px;
  left: -150px;
  animation: float 18s ease-in-out infinite reverse;
}
.hero-orb {
  position: absolute;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  border: 1px solid rgba(29, 161, 242, 0.2);
  top: 30%;
  right: 10%;
  animation: spin 30s linear infinite;
}
.hero-orb::before,
.hero-orb::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  background: var(--c-primary);
  box-shadow: 0 0 20px var(--c-primary);
}
.hero-orb::before {
  width: 8px;
  height: 8px;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
}
.hero-orb::after {
  width: 6px;
  height: 6px;
  bottom: 20%;
  right: 10%;
  background: var(--c-accent);
  box-shadow: 0 0 16px var(--c-accent);
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}
@keyframes float {
  0%,
  100% {
    transform: translate(0, 0);
  }
  50% {
    transform: translate(20px, -30px);
  }
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--c-primary-3);
  background: rgba(29, 161, 242, 0.08);
  border: 1px solid rgba(29, 161, 242, 0.25);
  border-radius: var(--r-full);
  margin-bottom: 24px;
}
.hero-eyebrow .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-primary);
  box-shadow: 0 0 8px var(--c-primary);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(0.8);
  }
}
.hero-title {
  font-size: clamp(40px, 6vw, 68px);
  font-weight: 800;
  line-height: 1.08;
  color: var(--c-text);
  margin-bottom: 22px;
  letter-spacing: -0.025em;
}
.hero-sub {
  font-size: 18px;
  line-height: 1.7;
  color: var(--c-text-2);
  max-width: 600px;
  margin-bottom: 36px;
}
.hero-sub strong {
  color: var(--c-text);
  font-weight: 600;
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 28px;
}
.hero-bullets {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 14px;
  color: var(--c-text-2);
}
.hero-bullets li {
  display: flex;
  align-items: center;
  gap: 8px;
}
.b-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-primary);
}

/* Hero visual - tweet card */
.hero-visual {
  position: relative;
  min-height: 460px;
}
.tweet-card {
  position: relative;
  background: linear-gradient(180deg, #0f172a 0%, #0b1322 100%);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 22px;
  box-shadow:
    var(--sh-2),
    0 0 0 1px rgba(29, 161, 242, 0.06);
  transform: rotate(-1.5deg);
  transition: transform 0.5s var(--ease);
}
.tweet-card:hover {
  transform: rotate(0deg) translateY(-4px);
}
.tweet-card::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: var(--r-lg);
  padding: 1px;
  background: linear-gradient(135deg, rgba(29, 161, 242, 0.4), transparent 60%);
  mask:
    linear-gradient(#000 0 0) content-box,
    linear-gradient(#000 0 0);
  mask-composite: exclude;
  -webkit-mask:
    linear-gradient(#000 0 0) content-box,
    linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  pointer-events: none;
}
.tweet-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}
.tweet-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--g-primary);
  position: relative;
  flex-shrink: 0;
}
.tweet-avatar::after {
  content: "YB";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  font-family: "Manrope", sans-serif;
}
.tweet-user {
  flex: 1;
  display: flex;
  flex-direction: column;
}
.tweet-user strong {
  color: var(--c-text);
  font-size: 15px;
}
.tweet-user span {
  color: var(--c-text-3);
  font-size: 13px;
}
.tweet-x {
  color: var(--c-text-2);
}
.tweet-body {
  font-size: 15px;
  color: var(--c-text);
  line-height: 1.6;
  margin-bottom: 14px;
  white-space: pre-line;
}
.tweet-card-embed {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  margin-bottom: 14px;
}
.tce-img {
  width: 56px;
  height: 56px;
  border-radius: 10px;
  background: linear-gradient(135deg, #1da1f2, #0ea5e9 50%, #06b6d4);
  flex-shrink: 0;
  position: relative;
}
.tce-img::after {
  content: "PDF";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  color: #fff;
  font-family: "JetBrains Mono", monospace;
}
.tce-text {
  display: flex;
  flex-direction: column;
}
.tce-text strong {
  color: var(--c-text);
  font-size: 14px;
}
.tce-text span {
  color: var(--c-text-3);
  font-size: 12px;
}
.tweet-actions {
  display: flex;
  gap: 18px;
  color: var(--c-text-2);
  font-size: 13px;
  font-family: "JetBrains Mono", monospace;
}

.float-card {
  position: absolute;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(14px);
  border: 1px solid var(--c-border-2);
  border-radius: var(--r-md);
  padding: 10px 16px;
  box-shadow: var(--sh-2);
  display: flex;
  flex-direction: column;
  align-items: center;
  animation: floatCard 4s ease-in-out infinite;
}
.fc-label {
  font-size: 11px;
  color: var(--c-text-3);
  font-family: "JetBrains Mono", monospace;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.fc-value {
  font-family: "Manrope", sans-serif;
  font-size: 22px;
  font-weight: 800;
  background: var(--g-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}
.float-card-a {
  top: -10px;
  left: -20px;
  animation-delay: 0s;
}
.float-card-b {
  top: 40%;
  right: -30px;
  animation-delay: 1s;
}
.float-card-c {
  bottom: -10px;
  left: 30%;
  animation-delay: 2s;
}
@keyframes floatCard {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

.hero-scroll {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 40px;
  border: 1px solid var(--c-border-2);
  border-radius: var(--r-full);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 6px;
  z-index: 2;
}
.hero-scroll span {
  display: block;
  width: 2px;
  height: 8px;
  background: var(--c-primary-3);
  border-radius: 1px;
  animation: scrollDown 1.5s ease-in-out infinite;
}
@keyframes scrollDown {
  0% {
    transform: translateY(0);
    opacity: 1;
  }
  100% {
    transform: translateY(12px);
    opacity: 0;
  }
}

/* ============================================================
   STATS
   ============================================================ */
.stats {
  padding: 64px 0;
  background: linear-gradient(180deg, var(--c-bg) 0%, var(--c-bg-2) 100%);
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
  position: relative;
  overflow: hidden;
}
.stats::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(
      circle at 20% 50%,
      rgba(29, 161, 242, 0.05) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 50%,
      rgba(6, 182, 212, 0.05) 0%,
      transparent 50%
    );
  pointer-events: none;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 32px;
  position: relative;
}
.stat-item {
  text-align: center;
  padding: 16px;
  position: relative;
}
.stat-item:not(:last-child)::after {
  content: "";
  position: absolute;
  right: -16px;
  top: 20%;
  bottom: 20%;
  width: 1px;
  background: linear-gradient(
    180deg,
    transparent,
    var(--c-border-2),
    transparent
  );
}
.stat-num {
  font-family: "Manrope", sans-serif;
  font-size: clamp(36px, 4vw, 52px);
  font-weight: 800;
  background: var(--g-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  line-height: 1.1;
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
}
.stat-prefix,
.stat-suffix {
  font-size: 0.6em;
  font-weight: 700;
}
.stat-label {
  margin-top: 8px;
  font-size: 14px;
  color: var(--c-text-2);
}

/* ============================================================
   SECTIONS - COMMON
   ============================================================ */
.section {
  padding: 100px 0;
  position: relative;
}
.section-alt {
  background: var(--c-bg-2);
  position: relative;
}
.section-alt::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(
      circle at 10% 0%,
      rgba(29, 161, 242, 0.04) 0%,
      transparent 40%
    ),
    radial-gradient(
      circle at 90% 100%,
      rgba(6, 182, 212, 0.04) 0%,
      transparent 40%
    );
  pointer-events: none;
}
.section-head {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 64px;
  position: relative;
  z-index: 1;
}
.eyebrow {
  display: inline-block;
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--c-primary-3);
  margin-bottom: 14px;
  text-transform: uppercase;
  position: relative;
  padding: 0 12px;
}
.eyebrow::before,
.eyebrow::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 20px;
  height: 1px;
  background: var(--c-primary);
  opacity: 0.5;
}
.eyebrow::before {
  left: -22px;
}
.eyebrow::after {
  right: -22px;
}
.section-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  color: var(--c-text);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}
.section-sub {
  font-size: 16px;
  color: var(--c-text-2);
  line-height: 1.7;
  max-width: 680px;
  margin: 0 auto;
}

/* ============================================================
   ADVANTAGES
   ============================================================ */
.adv-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  position: relative;
  z-index: 1;
}
.adv-card {
  position: relative;
  padding: 32px 28px;
  background: var(--g-card);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  transition:
    transform 0.35s var(--ease),
    border-color 0.3s ease,
    background 0.3s ease;
  overflow: hidden;
}
.adv-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--g-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
}
.adv-card:hover {
  transform: translateY(-6px);
  border-color: rgba(29, 161, 242, 0.35);
  background: linear-gradient(
    160deg,
    rgba(29, 161, 242, 0.1) 0%,
    rgba(15, 23, 42, 0.6) 100%
  );
}
.adv-card:hover::before {
  transform: scaleX(1);
}
.adv-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  background: rgba(29, 161, 242, 0.1);
  border: 1px solid rgba(29, 161, 242, 0.25);
  border-radius: var(--r-md);
  color: var(--c-primary-3);
  margin-bottom: 20px;
  transition: all 0.3s var(--ease);
}
.adv-card:hover .adv-icon {
  background: var(--g-primary);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 8px 24px rgba(29, 161, 242, 0.4);
}
.adv-card h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 10px;
}
.adv-card p {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--c-text-2);
}

/* ============================================================
   SERVICE FLOW
   ============================================================ */
.flow-list {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  position: relative;
  z-index: 1;
}
.flow-list::before {
  content: "";
  position: absolute;
  top: 38px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--c-primary),
    var(--c-accent),
    transparent
  );
  opacity: 0.4;
  z-index: 0;
}
.flow-step {
  position: relative;
  text-align: center;
  padding: 24px 16px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  transition:
    transform 0.3s var(--ease),
    border-color 0.3s ease;
}
.flow-step:hover {
  transform: translateY(-4px);
  border-color: rgba(29, 161, 242, 0.3);
}
.flow-num {
  font-family: "Manrope", sans-serif;
  font-size: 32px;
  font-weight: 800;
  background: var(--g-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  margin: 0 auto 14px;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(29, 161, 242, 0.1);
  border: 2px solid rgba(29, 161, 242, 0.3);
  position: relative;
  z-index: 1;
}
.flow-step h4 {
  font-size: 17px;
  color: var(--c-text);
  margin-bottom: 8px;
}
.flow-step p {
  font-size: 13.5px;
  color: var(--c-text-2);
  line-height: 1.6;
}

/* ============================================================
   SERVICES
   ============================================================ */
.svc-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
  z-index: 1;
}
.svc-card {
  position: relative;
  padding: 28px 22px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  transition: all 0.3s var(--ease);
  overflow: hidden;
}
.svc-card::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 0;
  background: linear-gradient(180deg, transparent, rgba(29, 161, 242, 0.08));
  transition: height 0.4s var(--ease);
  pointer-events: none;
}
.svc-card:hover {
  transform: translateY(-4px);
  border-color: rgba(29, 161, 242, 0.3);
}
.svc-card:hover::after {
  height: 100%;
}
.svc-num {
  font-family: "JetBrains Mono", monospace;
  font-size: 13px;
  font-weight: 700;
  color: var(--c-primary-3);
  margin-bottom: 12px;
  opacity: 0.7;
}
.svc-card h3 {
  font-size: 16.5px;
  color: var(--c-text);
  margin-bottom: 8px;
  font-weight: 700;
}
.svc-card p {
  font-size: 13.5px;
  color: var(--c-text-2);
  line-height: 1.6;
}

/* ============================================================
   INDUSTRIES
   ============================================================ */
.ind-wrap {
  position: relative;
  z-index: 1;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: var(--sh-2);
}
.ind-tabs {
  display: flex;
  border-bottom: 1px solid var(--c-border);
  background: rgba(255, 255, 255, 0.02);
  overflow-x: auto;
  scrollbar-width: none;
}
.ind-tabs::-webkit-scrollbar {
  display: none;
}
.ind-tab {
  flex: 1;
  padding: 18px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--c-text-2);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: all 0.25s ease;
}
.ind-tab:hover {
  color: var(--c-text);
  background: rgba(255, 255, 255, 0.02);
}
.ind-tab.active {
  color: var(--c-primary-3);
  border-bottom-color: var(--c-primary);
  background: rgba(29, 161, 242, 0.05);
}
.ind-panels {
  padding: 48px;
}
.ind-panel {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 40px;
  align-items: center;
  animation: panelIn 0.4s var(--ease);
}
@keyframes panelIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.ind-content h3 {
  font-size: 24px;
  color: var(--c-text);
  margin-bottom: 14px;
  font-weight: 700;
}
.ind-content p {
  font-size: 15px;
  color: var(--c-text-2);
  line-height: 1.75;
  margin-bottom: 20px;
}
.ind-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.ind-list li {
  position: relative;
  padding-left: 24px;
  font-size: 14.5px;
  color: var(--c-text);
  line-height: 1.6;
}
.ind-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 14px;
  height: 8px;
  border-left: 2px solid var(--c-primary);
  border-bottom: 2px solid var(--c-primary);
  transform: rotate(-45deg);
  border-radius: 1px;
}
.ind-metrics {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 28px;
  background: var(--g-primary-soft);
  border: 1px solid rgba(29, 161, 242, 0.2);
  border-radius: var(--r-lg);
}
.ind-metrics div {
  display: flex;
  flex-direction: column;
  padding: 12px 0;
  border-bottom: 1px dashed var(--c-border-2);
}
.ind-metrics div:last-child {
  border-bottom: 0;
}
.ind-metrics strong {
  font-family: "Manrope", sans-serif;
  font-size: 28px;
  font-weight: 800;
  background: var(--g-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  line-height: 1.1;
}
.ind-metrics span {
  font-size: 13px;
  color: var(--c-text-2);
  margin-top: 4px;
}

/* ============================================================
   CASES
   ============================================================ */
.case-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  position: relative;
  z-index: 1;
}
.case-card {
  position: relative;
  padding: 32px;
  background: var(--g-card);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  transition: all 0.3s var(--ease);
  overflow: hidden;
}
.case-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--g-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
}
.case-card:hover {
  transform: translateY(-4px);
  border-color: rgba(29, 161, 242, 0.3);
}
.case-card:hover::before {
  opacity: 1;
}
.case-tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  color: var(--c-primary-3);
  background: rgba(29, 161, 242, 0.1);
  border: 1px solid rgba(29, 161, 242, 0.25);
  border-radius: var(--r-full);
  margin-bottom: 16px;
  font-family: "JetBrains Mono", monospace;
  letter-spacing: 0.04em;
}
.case-card h3 {
  font-size: 19px;
  color: var(--c-text);
  margin-bottom: 12px;
  font-weight: 700;
}
.case-card p {
  font-size: 14.5px;
  color: var(--c-text-2);
  line-height: 1.7;
  margin-bottom: 20px;
}
.case-metrics {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 16px;
  border-top: 1px dashed var(--c-border-2);
}
.case-metrics div {
  flex: 1;
  min-width: 80px;
  display: flex;
  flex-direction: column;
}
.case-metrics strong {
  font-family: "Manrope", sans-serif;
  font-size: 20px;
  font-weight: 800;
  color: var(--c-primary-3);
  line-height: 1.1;
}
.case-metrics span {
  font-size: 12px;
  color: var(--c-text-3);
  margin-top: 4px;
}

/* ============================================================
   FAQ
   ============================================================ */
.faq-list {
  max-width: 920px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: relative;
  z-index: 1;
}
.faq-item {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  overflow: hidden;
  transition:
    border-color 0.3s ease,
    background 0.3s ease;
}
.faq-item.is-open {
  border-color: rgba(29, 161, 242, 0.3);
  background: linear-gradient(
    180deg,
    var(--c-surface),
    rgba(29, 161, 242, 0.04)
  );
}
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  text-align: left;
  font-size: 16px;
  font-weight: 600;
  color: var(--c-text);
  font-family: "Inter", "PingFang SC", sans-serif;
  transition: color 0.2s ease;
}
.faq-question:hover {
  color: var(--c-primary-3);
}
.faq-q-text {
  flex: 1;
}
.faq-toggle {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(29, 161, 242, 0.1);
  border: 1px solid rgba(29, 161, 242, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-primary-3);
  font-size: 18px;
  font-weight: 600;
  transition: all 0.3s var(--ease);
}
.faq-item.is-open .faq-toggle {
  background: var(--g-primary);
  color: #fff;
  border-color: transparent;
  transform: rotate(45deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--ease);
}
.faq-item.is-open .faq-answer {
  max-height: 400px;
}
.faq-a-inner {
  padding: 0 24px 22px 24px;
  font-size: 14.5px;
  color: var(--c-text-2);
  line-height: 1.8;
  border-top: 1px dashed var(--c-border);
  padding-top: 16px;
  margin-top: 0;
}
.faq-item.is-open .faq-a-inner {
  border-top: 1px dashed rgba(29, 161, 242, 0.2);
  padding-top: 16px;
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact {
  background: var(--c-bg-2);
}
.contact-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: stretch;
  position: relative;
  z-index: 1;
}
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.info-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  transition:
    border-color 0.3s ease,
    transform 0.3s var(--ease);
}
.info-item:hover {
  border-color: rgba(29, 161, 242, 0.3);
  transform: translateX(4px);
}
.info-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: rgba(29, 161, 242, 0.1);
  border: 1px solid rgba(29, 161, 242, 0.25);
  border-radius: var(--r-md);
  color: var(--c-primary-3);
  display: flex;
  align-items: center;
  justify-content: center;
}
.info-label {
  font-size: 12px;
  color: var(--c-text-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 4px;
  font-family: "JetBrains Mono", monospace;
  font-weight: 600;
}
.info-value {
  font-family: "Manrope", "PingFang SC", sans-serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--c-text);
}
.info-link:hover {
  color: var(--c-primary-3);
}
.info-sub {
  font-size: 13px;
  color: var(--c-text-2);
  margin-top: 4px;
}

.weibo-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  background: linear-gradient(135deg, #ff6b6b, #ee2c7b);
  color: #fff !important;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--r-full);
  align-self: flex-start;
  transition:
    transform 0.25s var(--ease),
    box-shadow 0.25s var(--ease);
  box-shadow: 0 6px 18px rgba(238, 44, 123, 0.3);
}
.weibo-link:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(238, 44, 123, 0.45);
}

.contact-qr {
  display: flex;
  align-items: center;
  justify-content: center;
}
.qr-card {
  width: 100%;
  max-width: 320px;
  padding: 28px;
  background: linear-gradient(
    180deg,
    var(--c-surface) 0%,
    var(--c-surface-2) 100%
  );
  border: 1px solid var(--c-border);
  border-radius: var(--r-xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.qr-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--g-primary);
}
.qr-img {
  width: 220px;
  height: 220px;
  margin: 0 auto 18px;
  background: #fff;
  border-radius: var(--r-md);
  padding: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.qr-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.qr-card p {
  font-size: 17px;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 4px;
}
.qr-card span {
  font-size: 13px;
  color: var(--c-text-2);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--c-bg);
  border-top: 1px solid var(--c-border);
  position: relative;
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--g-primary);
  opacity: 0.5;
}
.footer-business {
  padding: 64px var(--pad-x) 40px;
}
.footer-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 32px;
  text-align: center;
  position: relative;
  display: inline-block;
  width: 100%;
}
.footer-title::before,
.footer-title::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 60px;
  height: 1px;
  background: var(--c-border-2);
}
.footer-title::before {
  left: calc(50% - 140px);
}
.footer-title::after {
  right: calc(50% - 140px);
}
.biz-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 24px;
}
.biz-col h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--c-border);
  position: relative;
}
.biz-col h4::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 24px;
  height: 1px;
  background: var(--c-primary);
}
.biz-col ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.biz-col a {
  font-size: 13px;
  color: var(--c-text-2);
  transition:
    color 0.2s ease,
    padding-left 0.2s ease;
  display: inline-block;
}
.biz-col a:hover {
  color: var(--c-primary-3);
  padding-left: 4px;
}

.footer-copyright {
  padding: 24px 0;
  border-top: 1px solid var(--c-border);
  background: rgba(0, 0, 0, 0.4);
}
.copy-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: var(--c-text-3);
}
.copy-inner a {
  color: var(--c-text-2);
  transition: color 0.2s ease;
}
.copy-inner a:hover {
  color: var(--c-primary-3);
}

/* ============================================================
   REVEAL ANIMATIONS
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 0.8s var(--ease),
    transform 0.8s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .primary-nav {
    display: none;
  }
  .menu-toggle {
    display: inline-flex;
  }
  .header-cta .phone-pill {
    display: none;
  }
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-visual {
    min-height: 360px;
    max-width: 480px;
    margin: 0 auto;
  }
  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
  .stat-item:nth-child(3)::after {
    display: none;
  }
  .adv-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .flow-list {
    grid-template-columns: repeat(3, 1fr);
  }
  .flow-list::before {
    display: none;
  }
  .svc-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .case-grid {
    grid-template-columns: 1fr;
  }
  .ind-panel {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .ind-panels {
    padding: 32px;
  }
  .biz-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .float-card-b {
    right: -10px;
  }
}

@media (max-width: 640px) {
  :root {
    --pad-x: 18px;
    --header-h: 64px;
  }
  .brand-text {
    font-size: 15px;
    gap: 6px;
  }
  .brand-sep,
  .brand-tag {
    font-size: 14px;
  }
  .brand-logo svg {
    width: 30px;
    height: 30px;
  }
  .hero {
    padding-top: calc(var(--header-h) + 24px);
    padding-bottom: 60px;
  }
  .hero-title {
    font-size: 36px;
  }
  .hero-sub {
    font-size: 15px;
  }
  .hero-cta {
    flex-direction: column;
    align-items: stretch;
  }
  .hero-cta .btn {
    justify-content: center;
  }
  .hero-visual {
    min-height: 320px;
  }
  .tweet-card {
    padding: 18px;
  }
  .float-card-a {
    left: -8px;
    top: -4px;
  }
  .float-card-b {
    right: -8px;
  }
  .float-card-c {
    left: 20%;
    bottom: -4px;
  }
  .fc-value {
    font-size: 18px;
  }
  .stats {
    padding: 48px 0;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }
  .stat-item::after {
    display: none !important;
  }
  .section {
    padding: 64px 0;
  }
  .section-head {
    margin-bottom: 40px;
  }
  .adv-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .flow-list {
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }
  .svc-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }
  .svc-card {
    padding: 22px 16px;
  }
  .ind-tabs {
    gap: 0;
  }
  .ind-tab {
    padding: 14px 12px;
    font-size: 13px;
  }
  .ind-panels {
    padding: 24px 18px;
  }
  .ind-metrics {
    padding: 20px;
  }
  .ind-metrics strong {
    font-size: 22px;
  }
  .case-card {
    padding: 24px;
  }
  .case-metrics {
    gap: 10px;
  }
  .case-metrics strong {
    font-size: 17px;
  }
  .faq-question {
    padding: 16px 18px;
    font-size: 15px;
  }
  .faq-a-inner {
    padding: 0 18px 18px;
    font-size: 14px;
  }
  .info-item {
    padding: 16px;
  }
  .info-value {
    font-size: 17px;
  }
  .qr-card {
    padding: 20px;
  }
  .qr-img {
    width: 180px;
    height: 180px;
  }
  .footer-business {
    padding: 48px var(--pad-x) 32px;
  }
  .biz-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }
  .footer-title::before,
  .footer-title::after {
    display: none;
  }
  .copy-inner {
    flex-direction: column;
    text-align: center;
    font-size: 12px;
  }
}

@media (max-width: 380px) {
  .svc-grid {
    grid-template-columns: 1fr;
  }
  .flow-list {
    grid-template-columns: 1fr;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .biz-grid {
    grid-template-columns: 1fr;
  }
}