:root {
  /* Base */
  --bg: #ffffff;
  --bg2: #f7fbff;

  --text: #1f2a44;
  --muted: #5f6f93;

  --card: #ffffff;
  --line: #e9effa;

  /* Theme: Blue + Pink + White */
  --blue: #5aa7ff; /* 主蓝 */
  --blue2: #8bd8ff; /* 浅蓝 */
  --pink: #ff86c8; /* 点缀粉 */
  --pink2: #ffd1ea; /* 浅粉 */

  --primary: var(--blue);
  --primary2: var(--pink);

  --soft: #eef6ff; /* 蓝白软底 */
  --soft2: #fff3fa; /* 粉白软底 */

  --ok: #23c483;
  --warn: #ffb020;
  --bad: #ff4d6d;

  --shadow: 0 16px 50px rgba(31, 42, 68, 0.1);
  --shadow2: 0 10px 28px rgba(31, 42, 68, 0.1);

  --r: 18px;
  --r2: 24px;

  --container: 1120px;
}

* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  font-family: "Roboto", system-ui, -apple-system, Segoe UI, Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(
      900px 520px at 18% 12%,
      rgba(90, 167, 255, 0.2),
      transparent 55%
    ),
    radial-gradient(
      820px 520px at 82% 14%,
      rgba(255, 134, 200, 0.18),
      transparent 56%
    ),
    radial-gradient(
      900px 520px at 50% 92%,
      rgba(139, 216, 255, 0.18),
      transparent 58%
    ),
    linear-gradient(180deg, var(--bg), var(--bg2));
}

a {
  color: inherit;
  text-decoration: none;
}
.container {
  width: min(var(--container), calc(100% - 40px));
  margin: 0 auto;
}

code {
  background: #f6f7ff;
  border: 1px solid var(--line);
  padding: 0.2rem 0.45rem;
  border-radius: 10px;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 8px;
}

.lang-btn {
  padding: 8px 10px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.85);
  cursor: pointer;
  font-weight: 900;
  color: rgba(31, 42, 68, 0.72);
  box-shadow: var(--shadow2);
  transition: 0.18s ease;
}

.lang-btn:hover {
  transform: translateY(-1px);
  background: linear-gradient(
    135deg,
    rgba(90, 167, 255, 0.1),
    rgba(255, 134, 200, 0.1)
  );
}

.lang-btn.is-active {
  border: none;
  color: white;
  background: linear-gradient(
    135deg,
    rgba(90, 167, 255, 0.95),
    rgba(255, 134, 200, 0.92)
  );
  box-shadow: 0 18px 45px rgba(90, 167, 255, 0.18);
}

@media (max-width: 980px) {
  .lang-switch {
    display: none;
  } /* 移动端收起来更清爽（你想显示也可以） */
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  background: linear-gradient(
    135deg,
    rgba(107, 123, 255, 0.22),
    rgba(139, 216, 255, 0.3)
  );
  border: 1px solid var(--line);
  box-shadow: var(--shadow2);
  font-size: 18px;
}
.brand-title {
  display: block;
  font-weight: 900;
  letter-spacing: 0.2px;
}
.brand-sub {
  display: block;
  margin-top: 2px;
  font-size: 12px;
  color: var(--muted);
}

.nav {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: rgba(31, 42, 68, 0.85);
}
.nav a {
  padding: 8px 10px;
  border-radius: 12px;
  transition: 0.18s ease;
}
.nav a:hover {
  background: rgba(107, 123, 255, 0.1);
}
.nav-cta {
  background: linear-gradient(
    135deg,
    rgba(90, 167, 255, 0.95),
    rgba(255, 134, 200, 0.92)
  );
  color: white;
  border: none;
  box-shadow: 0 16px 40px rgba(90, 167, 255, 0.2);
}

/* Mobile */
.hamburger {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.85);
  cursor: pointer;
}
.hamburger span {
  display: block;
  width: 18px;
  height: 2px;
  background: rgba(31, 42, 68, 0.85);
  margin: 4px auto;
  border-radius: 2px;
}
.mobile-menu {
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(14px);
  border-top: 1px solid var(--line);
}
.mobile-menu-inner {
  padding: 14px 0 18px;
  display: grid;
  gap: 10px;
}
.mobile-menu a {
  padding: 12px 12px;
  border: 1px solid var(--line);
  background: white;
  border-radius: 16px;
  box-shadow: var(--shadow2);
}
.mobile-menu a.nav-cta {
  color: white;
}

/* Hero */
.hero {
  position: relative;
  padding: 56px 0 40px;
  overflow: hidden;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 22px;
  align-items: start;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.75);
  box-shadow: var(--shadow2);
  color: rgba(31, 42, 68, 0.8);
}
.pill-dot {
  width: 10px;
  height: 10px;
  background: var(--ok);
  border-radius: 50%;
  box-shadow: 0 0 0 6px rgba(35, 196, 131, 0.14);
}

.hero h1 {
  margin: 18px 0 10px;
  font-size: clamp(36px, 4.6vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.8px;
}
.hero-accent {
  background: linear-gradient(
    135deg,
    rgba(90, 167, 255, 1),
    rgba(255, 134, 200, 1)
  );
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-desc {
  margin: 0 0 18px;
  font-size: 16px;
  color: rgba(31, 42, 68, 0.72);
  max-width: 56ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin: 18px 0 18px;
}

/* Buttons */
.btn {
  border: 1px solid var(--line);
  background: white;
  color: rgba(31, 42, 68, 0.92);
  padding: 12px 14px;
  border-radius: 16px;
  cursor: pointer;
  transition: 0.18s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-weight: 800;
  box-shadow: var(--shadow2);
}
.btn:hover {
  transform: translateY(-1px);
}
.btn:active {
  transform: translateY(0px);
}

.btn-primary {
  border: none;
  color: white;
  background: linear-gradient(
    135deg,
    rgba(90, 167, 255, 0.95),
    rgba(255, 134, 200, 0.92)
  );
  box-shadow: 0 18px 45px rgba(90, 167, 255, 0.18);
}
.btn-soft {
  background: var(--soft);
  border-color: rgba(90, 167, 255, 0.22);
}
.btn-link {
  background: transparent;
  border-color: transparent;
  box-shadow: none;
  color: rgba(31, 42, 68, 0.68);
  font-weight: 700;
}
.btn-link:hover {
  background: rgba(107, 123, 255, 0.1);
  border-color: rgba(107, 123, 255, 0.16);
  box-shadow: none;
}
.btn-block {
  width: 100%;
}

/* Stats */
.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.stat {
  padding: 12px 12px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.85);
  box-shadow: var(--shadow2);
}
.stat-k {
  font-size: 12px;
  color: rgba(31, 42, 68, 0.6);
}
.stat-v {
  margin-top: 6px;
  font-size: 16px;
  font-weight: 900;
}

/* Cards */
.card {
  padding: 18px;
  border-radius: var(--r);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
}
.card-glass {
  background: rgba(255, 255, 255, 0.82);
}
.card-title {
  font-weight: 900;
  letter-spacing: 0.2px;
  margin-bottom: 12px;
}

.kv {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px dashed rgba(95, 111, 147, 0.25);
}
.kv:last-of-type {
  border-bottom: none;
}
.k {
  color: rgba(31, 42, 68, 0.6);
  font-size: 13px;
}
.v {
  font-weight: 900;
}

.mini-btn {
  margin-left: 10px;
  padding: 6px 10px;
  border-radius: 14px;
  border: 1px solid rgba(255, 134, 200, 0.22);
  background: linear-gradient(
    135deg,
    rgba(90, 167, 255, 0.1),
    rgba(255, 134, 200, 0.1)
  );
  color: rgba(31, 42, 68, 0.86);
  cursor: pointer;
  font-weight: 800;
}
.mini-btn:hover {
  background: rgba(107, 123, 255, 0.14);
}

.divider {
  height: 1px;
  background: var(--line);
  margin: 14px 0;
}
.stack {
  display: grid;
  gap: 10px;
}
.note {
  margin: 12px 0 0;
  font-size: 12px;
  color: rgba(31, 42, 68, 0.58);
}

/* Sections */
.section {
  padding: 64px 0;
}
.section-soft {
  background: rgba(255, 255, 255, 0.55);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.section-head h2 {
  margin: 0;
  font-size: 28px;
  letter-spacing: -0.3px;
}
.section-head p {
  margin: 10px 0 0;
  color: rgba(31, 42, 68, 0.66);
  max-width: 70ch;
}
.grid-4 {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.grid-2 {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.card h3 {
  margin: 0 0 8px;
  font-size: 18px;
}
.card p {
  margin: 0;
  color: rgba(31, 42, 68, 0.7);
  line-height: 1.7;
}
.tag {
  margin-top: 12px;
  display: inline-flex;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: linear-gradient(
    135deg,
    rgba(90, 167, 255, 0.1),
    rgba(255, 134, 200, 0.1)
  );
  color: rgba(31, 42, 68, 0.78);
  font-size: 12px;
  font-weight: 800;
}
.card-big {
  padding: 22px;
}

/* Footer */
.footer {
  padding: 28px 0 12px;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.7);
}
.footer-inner {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
}
.footer-title {
  font-weight: 900;
}
.footer-sub {
  margin-top: 6px;
  color: rgba(31, 42, 68, 0.62);
}
.footer-links {
  color: rgba(31, 42, 68, 0.65);
}
.footer-links a {
  padding: 6px 8px;
  border-radius: 12px;
}
.footer-links a:hover {
  background: rgba(107, 123, 255, 0.1);
}
.footer-bottom {
  padding: 12px 0 18px;
  color: rgba(31, 42, 68, 0.52);
}

/* Cute bubbles */
.bubbles {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}
.bubbles span {
  position: absolute;
  width: 180px;
  height: 180px;
  border-radius: 999px;
  background: radial-gradient(
    circle at 30% 30%,
    rgba(139, 216, 255, 0.48),
    rgba(255, 134, 200, 0.16)
  );
  opacity: 0.32;
  animation: floaty 12s ease-in-out infinite;
}
.bubbles span:nth-child(1) {
  left: -40px;
  top: 90px;
  animation-duration: 13s;
}
.bubbles span:nth-child(2) {
  right: -60px;
  top: 160px;
  width: 240px;
  height: 240px;
  animation-duration: 16s;
}
.bubbles span:nth-child(3) {
  left: 18%;
  bottom: -120px;
  width: 260px;
  height: 260px;
  animation-duration: 18s;
}
.bubbles span:nth-child(4) {
  right: 12%;
  bottom: -140px;
  width: 300px;
  height: 300px;
  animation-duration: 20s;
}

@keyframes floaty {
  0% {
    transform: translateY(0) translateX(0) scale(1);
  }
  50% {
    transform: translateY(-18px) translateX(10px) scale(1.03);
  }
  100% {
    transform: translateY(0) translateX(0) scale(1);
  }
}

/* Responsive */
@media (max-width: 980px) {
  .nav {
    display: none;
  }
  .hamburger {
    display: block;
  }
  .hero-inner {
    grid-template-columns: 1fr;
  }
  .grid-4 {
    grid-template-columns: 1fr 1fr;
  }
  .grid-2 {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 520px) {
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .stats {
    grid-template-columns: 1fr;
  }
  .container {
    width: min(var(--container), calc(100% - 28px));
  }
}