/* SUMERGE Frontend — Base */
@font-face {
  font-display: swap;
  font-family: "Alibaba PuHuiTi";
  font-style: normal;
  font-weight: 200;
  src: url("../fonts/AlibabaPuHuiTi-3-45-Light.woff2") format("woff2");
}

@font-face {
  font-display: swap;
  font-family: "Alibaba PuHuiTi";
  font-style: normal;
  font-weight: 400;
  src: url("../fonts/AlibabaPuHuiTi-3-55-Regular.woff2") format("woff2");
}

@font-face {
  font-display: swap;
  font-family: "Alibaba PuHuiTi";
  font-style: normal;
  font-weight: 700;
  src: url("../fonts/AlibabaPuHuiTi-3-85-Bold.woff2") format("woff2");
}

:root {
  --color-bg: #000;
  --color-surface: #202123;
  --color-surface-2: #1f2022;
  --color-surface-3: #252629;
  --color-text: #fff;
  --color-text-muted: rgba(255, 255, 255, 0.65);
  --color-text-dim: rgba(255, 255, 255, 0.55);
  --color-accent: #9747ff;
  --color-accent-light: #a34cff;
  --color-border: rgba(255, 255, 255, 0.1);
  --header-height: 80px;
  --container-max: 1440px;
  --font-sans: "Alibaba PuHuiTi", sans-serif;
  --radius-sm: 5px;
  --radius-md: 6px;
  --radius-pill: 9999px;
  --transition: 0.18s ease;
}

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

html {
  color-scheme: dark;
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.5;
  min-height: 100vh;
  overflow-x: hidden;
}

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

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

button {
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  font: inherit;
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-weight: 700;
  line-height: 1.25;
}

.site-container {
  margin-inline: auto;
  width: min(100% - 40px, var(--container-max));
}

.site-section {
  padding-block: 88px;
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  text-align: center;
}

.btn-outline {
  align-items: center;
  border: 1px solid hsla(0, 0%, 100%, 0.7);
  border-radius: var(--radius-pill);
  color: #fff;
  display: inline-flex;
  font-size: 13px;
  justify-content: center;
  min-height: 38px;
  padding: 7px 24px;
  transition: border-color var(--transition), background var(--transition);
}

.btn-outline:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.btn-primary {
  align-items: center;
  background: var(--color-accent);
  border-radius: var(--radius-pill);
  color: #fff;
  display: inline-flex;
  font-size: 13px;
  justify-content: center;
  min-height: 38px;
  padding: 7px 24px;
  transition: background var(--transition);
}

.btn-primary:hover {
  background: #aa68ff;
}

.text-accent {
  color: var(--color-accent-light);
}

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

.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;
}

@media (max-width: 640px) {
  .site-container {
    width: min(100% - 32px, var(--container-max));
  }

  .site-section {
    padding-block: 64px;
  }
}