:root {
  --color-ink: #0b1733;
  --color-body: #46546d;
  --color-muted: #7d8aa3;
  --color-line: rgba(11, 23, 51, 0.1);
  --color-line-strong: rgba(11, 23, 51, 0.18);
  --color-surface: #ffffff;
  --color-surface-soft: #f3f7fc;
  --color-surface-deep: #e8eef8;
  --color-navy: #07152f;
  --color-navy-soft: #102655;
  --color-blue: #1554d3;
  --color-blue-soft: #5a9cff;
  --color-amber: #efaa3d;
  --color-amber-soft: #ffd694;
  --color-green: #1ea37a;
  --gradient-hero:
    radial-gradient(circle at 20% 20%, rgba(90, 156, 255, 0.18), transparent 32%),
    radial-gradient(circle at 80% 18%, rgba(239, 170, 61, 0.14), transparent 26%),
    radial-gradient(circle at 50% 78%, rgba(18, 38, 85, 0.36), transparent 44%),
    linear-gradient(135deg, #050d1d 0%, #0a1a3a 44%, #0d2f67 100%);
  --gradient-panel: linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.76));
  --shadow-soft: 0 20px 60px rgba(10, 23, 48, 0.08);
  --shadow-deep: 0 24px 80px rgba(6, 14, 30, 0.24);
  --radius-xs: 10px;
  --radius-sm: 16px;
  --radius-md: 24px;
  --radius-lg: 36px;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: clamp(1.6rem, 1.2rem + 1vw, 2.15rem);
  --font-size-3xl: clamp(2rem, 1.5rem + 1.6vw, 3rem);
  --font-size-4xl: clamp(2.8rem, 1.9rem + 3vw, 5rem);
  --line-height-tight: 1.1;
  --line-height-snug: 1.35;
  --line-height-base: 1.7;
  --line-height-loose: 1.9;
  --container-wide: 1320px;
  --container-main: 1180px;
  --container-narrow: 920px;
  --nav-height: 82px;
  --transition-fast: 180ms ease;
  --transition-base: 320ms ease;
  --z-nav: 50;
  --z-overlay: 70;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  color: var(--color-body);
  background: var(--color-surface-soft);
  line-height: var(--line-height-base);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

main {
  overflow: clip;
}

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

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

button,
input,
textarea,
select {
  font: inherit;
}

button {
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6,
p {
  margin: 0;
}

section {
  position: relative;
}

::selection {
  color: #fff;
  background: rgba(21, 84, 211, 0.9);
}

.container,
.container-wide,
.container-narrow {
  width: min(100% - 2rem, var(--container-main));
  margin: 0 auto;
}

.container-wide {
  width: min(100% - 2rem, var(--container-wide));
}

.container-narrow {
  width: min(100% - 2rem, var(--container-narrow));
}

.section {
  padding: var(--space-24) 0;
}

.section-dark {
  color: rgba(255, 255, 255, 0.8);
  background: var(--color-navy);
}

.section-dark h1,
.section-dark h2,
.section-dark h3,
.section-dark h4 {
  color: #fff;
}

.section + .section {
  border-top: 1px solid rgba(11, 23, 51, 0.04);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  border: 1px solid rgba(21, 84, 211, 0.18);
  background: rgba(21, 84, 211, 0.08);
  font-size: var(--font-size-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-blue);
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--color-amber);
  box-shadow: 0 0 0 0.35rem rgba(239, 170, 61, 0.18);
}

.section-head {
  display: grid;
  gap: clamp(1rem, 1.5vw, 1.35rem);
  align-items: start;
}

.section-head > div {
  display: grid;
  gap: 0.72rem;
}

.section-head--split {
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  gap: var(--space-10);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--font-size-3xl);
  line-height: var(--line-height-snug);
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

.section-desc {
  max-width: 58ch;
  font-size: var(--font-size-lg);
  line-height: 1.82;
  color: var(--color-body);
}

.section-dark .section-desc {
  color: rgba(255, 255, 255, 0.72);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.04);
  box-shadow: var(--shadow-soft);
}

.media-frame img {
  width: 100%;
  height: auto;
}

@media (max-width: 960px) {
  .section {
    padding: var(--space-20) 0;
  }

  .section-head--split {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  :root {
    --nav-height: 74px;
  }

  .container,
  .container-wide,
  .container-narrow {
    width: min(100% - 1.25rem, var(--container-main));
  }

  .section {
    padding: var(--space-16) 0;
  }

  .section-desc {
    font-size: 1rem;
  }
}

/* 2026 redesign */
:root {
  --color-ink: #101d21;
  --color-body: #4d5d66;
  --color-muted: #72818a;
  --color-line: rgba(16, 29, 33, 0.1);
  --color-line-strong: rgba(16, 29, 33, 0.2);
  --color-surface: #faf6ee;
  --color-surface-soft: #f1ebdf;
  --color-surface-deep: #e5dccb;
  --color-navy: #091416;
  --color-navy-soft: #112227;
  --color-blue: #3f7cf0;
  --color-blue-soft: #8fb4ff;
  --color-amber: #c98a48;
  --color-amber-soft: #f0c88f;
  --gradient-hero:
    radial-gradient(circle at 12% 18%, rgba(240, 200, 143, 0.18), transparent 26%),
    radial-gradient(circle at 82% 8%, rgba(63, 124, 240, 0.18), transparent 24%),
    linear-gradient(135deg, #081214 0%, #102126 45%, #1b3139 100%);
  --gradient-panel: linear-gradient(180deg, rgba(255, 250, 242, 0.88), rgba(248, 242, 232, 0.74));
  --shadow-soft: 0 24px 70px rgba(6, 13, 15, 0.08);
  --shadow-deep: 0 34px 110px rgba(5, 11, 13, 0.34);
  --radius-sm: 18px;
  --radius-md: 28px;
  --radius-lg: 42px;
  --font-size-4xl: clamp(3rem, 2rem + 3vw, 5.75rem);
  --nav-height: 88px;
}

html {
  background: #091416;
}

body {
  background:
    radial-gradient(circle at top left, rgba(201, 138, 72, 0.12), transparent 18%),
    radial-gradient(circle at top right, rgba(63, 124, 240, 0.1), transparent 20%),
    linear-gradient(180deg, #efe8dc 0%, #faf6ee 34%, #efe6d8 100%);
}

.site-shell {
  isolation: isolate;
}

main {
  position: relative;
}

.section {
  padding: clamp(4.75rem, 7vw, 7.25rem) 0;
}

.section-dark {
  color: rgba(255, 255, 255, 0.78);
  background: linear-gradient(180deg, #091416, #13262c);
}

.section + .section {
  border-top: 1px solid rgba(16, 29, 33, 0.06);
}

.eyebrow {
  gap: 0.9rem;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: none;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: #89633c;
}

.eyebrow::before {
  width: 2.4rem;
  height: 1px;
  border-radius: 0;
  box-shadow: none;
  background: currentColor;
}

.hero-home .eyebrow,
.page-hero .eyebrow,
.section-dark .eyebrow {
  color: rgba(255, 240, 220, 0.86);
}

.section-title {
  font-size: clamp(2.15rem, 1.5rem + 1.75vw, 3.5rem);
  line-height: 1.14;
  letter-spacing: -0.04em;
}

.section-desc {
  max-width: 56ch;
  font-size: 1.06rem;
}

.media-frame {
  border-radius: 32px;
  border: 1px solid rgba(255, 255, 255, 0.42);
  background: rgba(255, 249, 241, 0.74);
}

@media (max-width: 640px) {
  :root {
    --nav-height: 74px;
  }
}

/* ZTE-inspired blue and white refinement */
:root {
  --color-ink: #0d2250;
  --color-body: #50627f;
  --color-muted: #7d8dab;
  --color-line: rgba(13, 34, 80, 0.1);
  --color-line-strong: rgba(13, 34, 80, 0.18);
  --color-surface: #ffffff;
  --color-surface-soft: #f5f9ff;
  --color-surface-deep: #e8f1ff;
  --color-navy: #0b45b8;
  --color-navy-soft: #0f5be2;
  --color-blue: #0057d9;
  --color-blue-soft: #68aaff;
  --color-amber: #2f87ff;
  --color-amber-soft: #d7e8ff;
  --gradient-hero:
    radial-gradient(circle at 10% 14%, rgba(108, 170, 255, 0.18), transparent 24%),
    radial-gradient(circle at 92% 22%, rgba(0, 87, 217, 0.16), transparent 20%),
    linear-gradient(180deg, #ffffff 0%, #f3f8ff 48%, #e8f1ff 100%);
  --gradient-panel: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(244, 249, 255, 0.9));
  --shadow-soft: 0 24px 70px rgba(16, 55, 126, 0.08);
  --shadow-deep: 0 32px 90px rgba(16, 55, 126, 0.18);
}

html {
  background: #ffffff;
}

body {
  background:
    radial-gradient(circle at top left, rgba(104, 170, 255, 0.12), transparent 20%),
    linear-gradient(180deg, #ffffff 0%, #f7faff 36%, #eef5ff 100%);
}

.section-dark {
  background: linear-gradient(135deg, #0b45b8 0%, #0f5be2 52%, #1e79ff 100%);
}

.eyebrow {
  color: var(--color-blue);
}

.hero-home .eyebrow,
.page-hero .eyebrow,
.section-dark .eyebrow {
  color: rgba(255, 255, 255, 0.88);
}

.media-frame {
  border-color: rgba(0, 87, 217, 0.08);
  background: rgba(255, 255, 255, 0.94);
}

/* 2026 final refinement */
:root {
  --container-wide: 1400px;
  --container-main: 1240px;
  --container-narrow: 980px;
  --font-size-3xl: clamp(1.7rem, 1.36rem + 0.9vw, 2.4rem);
  --font-size-4xl: clamp(2.2rem, 1.72rem + 1.8vw, 3.6rem);
  --nav-height: 80px;
}

.section {
  padding: clamp(4rem, 6vw, 6rem) 0;
}

.section-head--split {
  grid-template-columns: minmax(0, 1.28fr) minmax(320px, 0.72fr);
  gap: clamp(1.5rem, 3vw, 3.5rem);
  align-items: start;
}

.section-title {
  font-size: clamp(1.65rem, 1.34rem + 0.92vw, 2.35rem);
  line-height: 1.18;
  letter-spacing: -0.035em;
}

.section-desc {
  max-width: 62ch;
  font-size: 1.02rem;
}

@media (max-width: 960px) {
  .section-head--split {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  :root {
    --nav-height: 68px;
  }
}