/* ============================================================
   Upstra 尚层科技 — Global Stylesheet
   Design: Minimal with texture — 极简质感
   ============================================================ */

/* --- CSS Custom Properties ---------------------------------- */
:root {
  /* Brand Colors */
  --color-primary: #463cfd;
  --color-primary-hover: #3528e8;
  --color-primary-light: rgba(70, 60, 253, 0.06);
  --color-primary-glow: rgba(70, 60, 253, 0.15);
  --color-dark: #171b3d;
  --color-dark-secondary: #2d3278;
  --color-dark-muted: #3a3f6b;

  /* Neutral */
  --color-bg: #fafaf9;
  --color-surface: #ffffff;
  --color-text: #171b3d;
  --color-text-secondary: #6b7280;
  --color-text-muted: #9ca3af;
  --color-border: #e8e8ec;
  --color-border-light: #f0f0f3;

  /* Typography — System font stack */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display",
               "Segoe UI", Roboto, "Helvetica Neue", Arial,
               "Noto Sans SC", "PingFang SC", "Microsoft YaHei",
               sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono",
               "Menlo", "Courier New", monospace;

  /* Type Scale */
  --text-xs: 0.75rem;     /* 12px */
  --text-sm: 0.875rem;    /* 14px */
  --text-base: 1rem;      /* 16px */
  --text-lg: 1.125rem;    /* 18px */
  --text-xl: 1.25rem;     /* 20px */
  --text-2xl: 1.5rem;     /* 24px */
  --text-3xl: 2rem;       /* 32px */
  --text-4xl: 2.5rem;     /* 40px */
  --text-5xl: 3.5rem;     /* 56px */
  --text-6xl: 4.5rem;     /* 72px */

  /* Spacing — 8px grid */
  --space-2xs: 0.25rem;   /*  4px */
  --space-xs:  0.5rem;    /*  8px */
  --space-sm:  0.75rem;   /* 12px */
  --space-md:  1rem;      /* 16px */
  --space-lg:  1.5rem;    /* 24px */
  --space-xl:  2rem;      /* 32px */
  --space-2xl: 3rem;      /* 48px */
  --space-3xl: 4rem;      /* 64px */
  --space-4xl: 6rem;      /* 96px */
  --space-5xl: 8rem;      /* 128px */

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.05);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.08);
  --shadow-xl: 0 24px 64px rgba(0,0,0,0.10);

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --duration-fast: 150ms;
  --duration-base: 300ms;
  --duration-slow: 500ms;
  --duration-lg: 800ms;

  /* Layout */
  --max-width: 1400px;
  --nav-height: 64px;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

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

/* --- Typography --------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-dark);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

p + p {
  margin-top: var(--space-md);
}

.section-label {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.section-title {
  margin-bottom: var(--space-lg);
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

/* --- Layout Utilities --------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

/* Larger padding on wide screens */
@media (min-width: 1600px) {
  .container {
    padding: 0 var(--space-3xl);
  }
  .nav__inner {
    padding: 0 var(--space-md);
  }
}

.section {
  padding: var(--space-5xl) 0;
}

.services-bg {
  background: url('../../images/service_bg_new.png') center/cover no-repeat;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: var(--space-4xl) var(--space-xl);
  position: relative;
}

/* Text over the full-screen services background (light/gray image) */
.services-bg .section-label {
  color: var(--color-primary);
  font-size: calc(var(--text-xs) * 1.5);
}

.services-bg .section-title {
  color: var(--color-dark);
  font-size: calc(var(--text-4xl) * 1.5);
}

.services-bg .section-subtitle {
  color: var(--color-text-secondary);
  font-size: calc(var(--text-lg) * 1.5);
}

.services-bg .card__title {
  font-size: calc(var(--text-lg) * 1.5);
}

.services-bg .card__desc {
  font-size: calc(var(--text-sm) * 1.5);
}

.card__number {
  font-family: var(--font-mono);
  font-size: calc(var(--text-xs) * 1.5);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: #c4b5fd;
  margin-bottom: var(--space-sm);
  position: relative;
}

.section-sm {
  padding: var(--space-3xl) 0;
}

/* --- Navigation --------------------------------------------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background: linear-gradient(
    to bottom,
    rgba(250, 250, 249, 0.7) 0%,
    rgba(250, 250, 249, 0) 100%
  );
  transition:
    background-color var(--duration-base) var(--ease-out),
    box-shadow var(--duration-base) var(--ease-out);
}

.nav--scrolled {
  background-color: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--color-border-light);
}

/* Index: full-screen hero sits behind the nav — light variant at top */
body[data-page="index"] .nav:not(.nav--scrolled) {
  background: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.45) 0%,
    rgba(0, 0, 0, 0) 100%
  );
}

body[data-page="index"] .nav:not(.nav--scrolled) .nav__logo img {
  filter: brightness(10);
}

body[data-page="index"] .nav:not(.nav--scrolled) .nav__links:not(.nav__links--open) .nav__link {
  color: rgba(255, 255, 255, 0.85);
}

body[data-page="index"] .nav:not(.nav--scrolled) .nav__links:not(.nav__links--open) .nav__link:hover,
body[data-page="index"] .nav:not(.nav--scrolled) .nav__links:not(.nav__links--open) .nav__link--active {
  color: #fff;
}

body[data-page="index"] .nav:not(.nav--scrolled) .nav__toggle span {
  background: #fff;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0 var(--space-md);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-dark);
  letter-spacing: -0.01em;
}

.nav__logo img {
  height: 32px;
  width: auto;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-out);
  position: relative;
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-dark);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
  transition: width var(--duration-base) var(--ease-out);
}

.nav__link:hover::after,
.nav__link--active::after {
  width: 100%;
}

.nav__lang {
  padding-left: var(--space-lg);
  border-left: 1px solid var(--color-border);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}

.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-dark);
  border-radius: 1px;
  transition: transform var(--duration-base) var(--ease-out);
}

/* --- Hero --------------------------------------------------- */
.hero {
  height: 100vh;
  height: 100svh;
  position: relative;
  overflow: hidden;
}

.hero__banner {
  width: 100%;
  height: 100%;
  line-height: 0;
  position: relative;
}

.hero__img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.hero__overlay {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  left: 12%;
  text-align: left;
  max-width: 700px;
  z-index: 2;
}

.hero__title {
  font-size: calc(var(--text-6xl) * 1.5);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: var(--space-md);
  color: #fff;
  text-shadow: 0 2px 16px rgba(0,0,0,0.3);
}

/* English title is much longer — smaller bump to avoid wrapping */
html[lang="en"] .hero__title {
  font-size: calc(var(--text-6xl) * 1.15);
}

.hero__title .highlight {
  background: linear-gradient(
    135deg,
    #a78bfa 0%,
    #c4b5fd 50%,
    #e0e7ff 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__desc {
  font-size: calc(var(--text-lg) * 1.5);
  color: rgba(255,255,255,0.85);
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.7;
  text-shadow: 0 1px 8px rgba(0,0,0,0.3);
}

/* Scroll indicator — subtle chevron at the bottom of full-screen sections */
.scroll-indicator {
  position: absolute;
  bottom: var(--space-2xl);
  left: 50%;
  z-index: 2;
  pointer-events: none;
  opacity: 0.55;
  animation: scrollBob 2.4s var(--ease-in-out) infinite;
}

.scroll-indicator::before {
  content: '';
  display: block;
  width: 18px;
  height: 18px;
  border-style: solid;
  border-width: 0 0 2.5px 2.5px;
  border-color: #fff;
  transform: rotate(-45deg);
}

/* Dark variant for light backgrounds */
.scroll-indicator--dark {
  opacity: 0.5;
}

.scroll-indicator--dark::before {
  border-color: var(--color-dark);
}

@keyframes scrollBob {
  0%, 100% {
    transform: translate(-50%, 0);
  }
  50% {
    transform: translate(-50%, 10px);
  }
}

/* --- Buttons ------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition:
    background var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out);
  cursor: pointer;
}

.btn:active {
  transform: scale(0.97);
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
}

.btn--primary:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 8px 24px var(--color-primary-glow);
}

.btn--outline {
  background: transparent;
  color: var(--color-dark);
  border: 1px solid var(--color-border);
}

.btn--outline:hover {
  background: var(--color-bg);
  border-color: var(--color-dark-secondary);
}

/* --- Cards -------------------------------------------------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-lg);
}

.card {
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition:
    transform var(--duration-base) var(--ease-out),
    box-shadow var(--duration-base) var(--ease-out),
    background var(--duration-base) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  background: rgba(255, 255, 255, 0.75);
}

.card__icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-md);
  font-size: var(--text-xl);
  position: relative;
}

.card__title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-xs);
  position: relative;
}

.card__desc {
  font-size: var(--text-sm);
  color: var(--color-dark-muted);
  line-height: 1.6;
  position: relative;
}

/* --- Advantages --------------------------------------------- */
.advantages {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3xl);
  text-align: center;
}

.advantage__number {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.advantage__title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.advantage__desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* --- Service Detail ----------------------------------------- */
.service-section {
  padding: var(--space-4xl) 0;
  border-bottom: 1px solid var(--color-border-light);
  background: center/cover no-repeat;
}

.service-section:last-child {
  border-bottom: none;
}

.service-section--intent {
  background-image: url('../../images/intention.png');
}

.service-section--agent {
  background-image: url('../../images/dialog.png');
}

.service-section--eval {
  background-image: url('../../images/evaluation.png');
}

.service-section--finetune {
  background-image: url('../../images/multi-domian.png');
}

.service-section__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  align-items: center;
}

.service-section__inner--reversed .service-section__visual {
  order: -1;
}

.service-section__number {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.service-section__title {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-md);
}

.service-section__desc {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}

.service-section__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.tag {
  display: inline-block;
  padding: var(--space-2xs) var(--space-sm);
  font-size: var(--text-xs);
  font-weight: 500;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: 20px;
  white-space: nowrap;
}

.service-section__visual {
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius-xl);
  padding: var(--space-3xl);
  min-height: 320px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  position: relative;
  overflow: hidden;
}

.service-section__visual--case {
  background: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  border: none;
  border-radius: 0;
  padding: 0;
  flex-direction: column;
  gap: var(--space-md);
}

.service-section__visual-inner {
  text-align: center;
  position: relative;
}

.service-section__visual-icon {
  font-size: 4rem;
  margin-bottom: var(--space-md);
  filter: grayscale(0.3);
}

.service-section__visual-text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

.service-section__case-img {
  width: 100%;
  height: auto;
  object-fit: contain;
  box-shadow: var(--shadow-lg);
}

.service-section__case-info {
  text-align: center;
  padding: 0 var(--space-md);
}

.service-section__case-title {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: var(--space-2xs);
  transition: color var(--duration-fast);
  line-height: 1.5;
}

.service-section__case-title:hover {
  color: var(--color-primary);
}

.service-section__case-venue {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 2px 10px;
  border-radius: 20px;
  margin-bottom: var(--space-2xs);
}

.service-section__case-link {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  transition: color var(--duration-fast);
}

.service-section__case-link:hover {
  color: var(--color-primary);
}

/* --- Team --------------------------------------------------- */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 320px));
  gap: var(--space-xl);
  justify-content: center;
}

.team-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl) var(--space-xl);
  text-align: center;
  transition:
    transform var(--duration-base) var(--ease-out),
    box-shadow var(--duration-base) var(--ease-out);
}

.team-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.team-card__avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: var(--color-primary-light);
  margin: 0 auto var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-3xl);
  color: var(--color-primary);
  font-weight: 700;
  overflow: hidden;
}

.team-card__avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.team-card__name {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-2xs);
}

.team-card__role {
  font-size: var(--text-sm);
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: var(--space-sm);
}

.team-card__bio {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* --- Profile Avatar ----------------------------------------- */
.profile-avatar {
  width: 120px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto var(--space-lg);
  display: block;
  box-shadow: var(--shadow-lg);
}

/* --- Profile Section ---------------------------------------- */
.profile-section {
  max-width: 820px;
}

.profile-section__title {
  font-size: var(--text-2xl);
  font-weight: 600;
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-primary-light);
}

.profile-section__text {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.profile-section__text a {
  color: var(--color-primary);
}

.profile-section__text a:hover {
  text-decoration: underline;
}

.profile-section__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-lg);
}

/* --- News --------------------------------------------------- */
.news-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.news-item {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
  padding-left: var(--space-lg);
  border-left: 3px solid var(--color-primary-light);
}

.news-date {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 2px 10px;
  border-radius: 20px;
  margin-right: var(--space-sm);
  vertical-align: middle;
}

/* --- Publication Item --------------------------------------- */
.pub-item {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: var(--space-xl);
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--color-border-light);
}

.pub-item:last-child {
  border-bottom: none;
}

.pub-item__img {
  position: relative;
}

.pub-item__img img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
}

.pub-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  font-size: var(--text-xs);
  font-weight: 600;
  color: #fff;
  background: var(--color-primary);
  padding: 2px 8px;
  border-radius: 4px;
  z-index: 1;
}

.pub-item__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.pub-item__title {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-dark);
  line-height: 1.5;
  transition: color var(--duration-fast) var(--ease-out);
}

.pub-item__title:hover {
  color: var(--color-primary);
}

.pub-item__authors {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.pub-item__venue {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 2px 10px;
  border-radius: 20px;
  width: fit-content;
}

.pub-item__abstract {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-top: var(--space-xs);
}

/* --- Project List ------------------------------------------- */
.project-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.project-item {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
  padding-left: var(--space-lg);
  border-left: 3px solid var(--color-border);
}

.project-item__name {
  display: block;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: var(--space-2xs);
}

a.project-item__name:hover {
  color: var(--color-primary);
}

.project-item__desc {
  font-size: var(--text-sm);
}

/* --- Education List ----------------------------------------- */
.edu-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.edu-item {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.edu-date {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  background: var(--color-border-light);
  padding: 2px 10px;
  border-radius: 4px;
  margin-right: var(--space-sm);
  vertical-align: middle;
}

.edu-degree {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 2px 8px;
  border-radius: 4px;
  margin-right: var(--space-xs);
  vertical-align: middle;
}

/* --- Contact List ------------------------------------------- */
.contact-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.contact-item {
  display: flex;
  gap: var(--space-md);
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  align-items: center;
}

.contact-item__label {
  font-weight: 600;
  color: var(--color-dark);
  min-width: 48px;
}

/* --- Page Header -------------------------------------------- */
.page-header {
  padding-top: calc(var(--nav-height) + var(--space-4xl));
  padding-bottom: var(--space-4xl);
  text-align: center;
}

.page-header__title {
  font-size: var(--text-5xl);
  margin-bottom: var(--space-md);
}

.page-header__desc {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}

/* --- Contact Icons ------------------------------------------ */
.footer__contact-icons {
  display: flex;
  gap: var(--space-sm);
}

.contact-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.7);
  transition:
    background var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
  position: relative;
  cursor: pointer;
}

.contact-icon:hover {
  background: rgba(255,255,255,0.15);
  color: #fff;
  transform: translateY(-2px);
}

.contact-icon__tip {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: #fff;
  color: var(--color-dark);
  font-size: var(--text-xs);
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 6px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.contact-icon__tip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: #fff;
}

.contact-icon__tip--show {
  opacity: 1;
}

/* --- Footer ------------------------------------------------- */
.footer {
  background: var(--color-dark);
  color: rgba(255,255,255,0.7);
  padding: var(--space-2xl) 0;
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

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

.footer__brand img {
  filter: brightness(10);
}

.footer__brand p {
  font-size: var(--text-sm);
  line-height: 1.7;
  max-width: 300px;
}

.footer__col-title {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #fff;
  margin-bottom: var(--space-md);
}

.footer__link {
  display: block;
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.6);
  margin-bottom: var(--space-xs);
  transition: color var(--duration-fast);
}

.footer__link:hover {
  color: #fff;
}

.footer__bottom {
  margin-top: var(--space-xl);
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255,255,255,0.08);
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.4);
  text-align: center;
}

/* --- No-JS Fallback ---------------------------------------- */
.no-js .animate-on-scroll,
.no-js .stagger-children > * {
  opacity: 1;
  transform: none;
}

/* --- Animations --------------------------------------------- */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(32px);
  transition:
    opacity var(--duration-slow) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
}

.animate-on-scroll--visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.stagger-children > * {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity var(--duration-slow) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
}

.stagger-children--visible > *:nth-child(1) { transition-delay: 0ms; }
.stagger-children--visible > *:nth-child(2) { transition-delay: 80ms; }
.stagger-children--visible > *:nth-child(3) { transition-delay: 160ms; }
.stagger-children--visible > *:nth-child(4) { transition-delay: 240ms; }
.stagger-children--visible > *:nth-child(5) { transition-delay: 320ms; }
.stagger-children--visible > *:nth-child(6) { transition-delay: 400ms; }

.stagger-children--visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive --------------------------------------------- */
@media (max-width: 1024px) {
  :root {
    --text-6xl: 3.5rem;
    --text-5xl: 2.75rem;
    --text-4xl: 2.25rem;
  }

  .service-section__inner {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .service-section__inner--reversed .service-section__visual {
    order: 0;
  }

  .advantages {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .footer__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2xl);
  }
}

@media (max-width: 768px) {
  :root {
    --text-6xl: 2.75rem;
    --text-5xl: 2.25rem;
    --text-4xl: 1.75rem;
    --text-3xl: 1.5rem;
    --nav-height: 56px;
  }

  .container {
    padding: 0 var(--space-lg);
  }

  .nav__links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: var(--space-lg);
    gap: var(--space-md);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition:
      transform var(--duration-base) var(--ease-out),
      opacity var(--duration-base) var(--ease-out);
  }

  .nav__links .nav__link {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-dark);
  }

  .nav__links--open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav__toggle {
    display: flex;
  }

  .hero__overlay {
    left: 5%;
    transform: translateY(-50%);
    text-align: left;
    width: 90%;
    max-width: 500px;
  }

  .hero__title {
    font-size: calc(var(--text-4xl) * 1.5);
  }

  html[lang="en"] .hero__title {
    font-size: calc(var(--text-4xl) * 1.15);
  }

  .hero__desc {
    font-size: calc(var(--text-sm) * 1.5);
  }

  .section {
    padding: var(--space-3xl) 0;
  }

  .service-section {
    padding: var(--space-3xl) 0;
  }

  .nav__lang {
    padding-left: 0;
    padding-top: var(--space-md);
    border-left: none;
    border-top: 1px solid var(--color-border);
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .team-grid {
    grid-template-columns: 1fr;
  }

  .page-header {
    padding-top: calc(var(--nav-height) + var(--space-2xl));
    padding-bottom: var(--space-xl);
  }

  .page-header__title {
    font-size: var(--text-3xl);
  }

  .page-header__desc {
    font-size: var(--text-sm);
  }

  .pub-item {
    grid-template-columns: 1fr;
  }

  .pub-item__img {
    max-width: 280px;
  }

  .profile-avatar {
    width: 96px;
    height: 128px;
  }

  .profile-section__title {
    font-size: var(--text-xl);
  }
}

/* --- Page transition ---------------------------------------- */
.page-transition {
  animation: pageIn var(--duration-slow) var(--ease-out);
}

@keyframes pageIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}