:root {
  --ink: #142236;
  --muted: #5f7185;
  --soft: #eef6ff;
  --soft-2: #f8fbff;
  --white: #ffffff;
  --navy: #071d35;
  --navy-2: #0c2a4a;
  --line: #d9e7f4;
  --blue: #176bd8;
  --blue-2: #0d4fb5;
  --cyan: #00aeca;
  --amber: #f2ad38;
  --green: #2c9c7a;
  --shadow: 0 18px 42px rgba(31, 77, 128, .13);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--soft-2);
  font-family: "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

button {
  border: 0;
  cursor: pointer;
}

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

[hidden] {
  display: none !important;
}

:focus-visible {
  outline: 3px solid rgba(0, 174, 202, .45);
  outline-offset: 4px;
}

.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;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 10px 14px;
  color: #fff;
  background: var(--navy);
  border-radius: 6px;
  transform: translateY(-160%);
  transition: transform .18s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid rgba(17, 88, 164, .14);
  background: rgba(248, 251, 255, .9);
  backdrop-filter: blur(16px);
}

.header-inner {
  width: min(1180px, calc(100% - 48px));
  min-height: 68px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand,
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--navy);
  font-weight: 850;
  white-space: nowrap;
}

.brand {
  font-size: 20px;
}

.brand img,
.footer-brand img {
  width: 38px;
  height: 38px;
  object-fit: contain;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: #35516c;
  font-size: 14px;
  font-weight: 700;
}

.site-nav a,
.product-entry-button {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
}

.site-nav > a {
  border-bottom: 2px solid transparent;
}

.site-nav > a:hover,
.site-nav > a[aria-current="true"] {
  color: var(--blue-2);
  border-bottom-color: var(--cyan);
}

.product-entry {
  position: relative;
}

.product-entry-button,
.header-reserve {
  min-height: 38px;
  padding: 0 14px;
  color: var(--navy);
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 800;
  transition: color .18s ease, background .18s ease, border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}

.product-entry-button {
  gap: 7px;
  background: transparent;
}

.product-entry-button:hover,
.product-entry.is-open .product-entry-button {
  color: var(--blue-2);
  background: rgba(23, 107, 216, .07);
  border-color: rgba(23, 107, 216, .12);
}

.header-reserve {
  color: #fff;
  background: linear-gradient(180deg, #0d5bc6 0%, #093f96 100%);
  border-color: rgba(76, 169, 255, .56);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .25), 0 12px 26px rgba(13, 79, 181, .18);
}

.header-reserve:hover {
  transform: translateY(-1px);
  background: linear-gradient(180deg, #1268d7 0%, #0b469f 100%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .28), 0 16px 30px rgba(13, 79, 181, .22);
}

.product-menu {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  width: 260px;
  padding: 8px;
  display: grid;
  gap: 4px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(-8px);
  pointer-events: none;
  transition: opacity .18s ease, transform .18s ease;
}

.product-entry.is-open .product-menu {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.product-menu a {
  min-height: auto;
  padding: 12px;
  display: grid;
  gap: 4px;
  border-radius: 6px;
}

.product-menu a:hover {
  background: var(--soft);
}

.product-menu strong {
  color: var(--navy);
  font-size: 15px;
}

.product-menu span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  place-items: center;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.nav-toggle-lines,
.nav-toggle-lines::before,
.nav-toggle-lines::after {
  width: 18px;
  height: 2px;
  display: block;
  background: var(--navy);
  border-radius: 2px;
}

.nav-toggle-lines {
  position: relative;
}

.nav-toggle-lines::before,
.nav-toggle-lines::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle-lines::before {
  top: -6px;
}

.nav-toggle-lines::after {
  top: 6px;
}

.hero {
  position: relative;
  min-height: 560px;
  height: clamp(560px, calc(100svh - 86px), 690px);
  display: flex;
  align-items: center;
  color: #dcecff;
  overflow: hidden;
  background-color: #08213d;
  background-image:
    linear-gradient(90deg, rgba(5, 18, 34, .94) 0%, rgba(7, 29, 53, .72) 36%, rgba(7, 29, 53, .16) 66%, rgba(7, 29, 53, .02) 100%),
    linear-gradient(180deg, rgba(7, 29, 53, .00) 0%, rgba(7, 29, 53, .08) 64%, rgba(7, 29, 53, .34) 100%),
    url("/assets/student-classroom.png");
  background-position: center, center, right top;
  background-repeat: no-repeat;
  background-size: 100% 100%, 100% 100%, auto 100%;
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 1px;
  background: rgba(255, 255, 255, .24);
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  padding: 56px 0 86px;
}

.eyebrow {
  margin: 0 0 13px;
  color: var(--cyan);
  font-size: 13px;
  font-weight: 850;
}

.hero .eyebrow {
  color: #7bd8ee;
}

.hero h1 {
  margin: 0;
  color: #d8e8f8;
  font-size: clamp(58px, 9vw, 112px);
  line-height: .98;
  font-weight: 850;
  text-shadow: 0 14px 34px rgba(0, 20, 44, .32);
}

.hero-lede {
  margin: 18px 0 0;
  color: #f2f8ff;
  font-size: clamp(28px, 3.6vw, 46px);
  line-height: 1.12;
  font-weight: 820;
  text-shadow: 0 10px 28px rgba(0, 24, 52, .26);
}

.hero-copy {
  width: min(650px, 100%);
  margin: 22px 0 30px;
  color: #c7d8e9;
  font-size: 18px;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  min-height: 48px;
  padding: 0 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--navy);
  background: #fff;
  border: 1px solid rgba(255, 255, 255, .48);
  border-radius: 8px;
  font-weight: 850;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 34px rgba(0, 38, 82, .18);
}

.button-primary {
  color: #eef8ff;
  background: linear-gradient(180deg, #155dbf 0%, #0a438f 100%);
  border-color: rgba(118, 207, 235, .46);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .18), 0 12px 26px rgba(4, 29, 68, .18);
}

.button-secondary {
  color: #123150;
  background: rgba(242, 248, 255, .88);
  border-color: rgba(210, 228, 242, .9);
}

.hero-status {
  position: absolute;
  left: 50%;
  bottom: 24px;
  z-index: 1;
  width: min(1180px, calc(100% - 48px));
  display: flex;
  gap: 10px;
  transform: translateX(-50%);
}

.hero-status span {
  min-height: 34px;
  padding: 0 13px;
  display: inline-flex;
  align-items: center;
  color: #d9f8ff;
  background: rgba(8, 33, 61, .66);
  border: 1px solid rgba(132, 227, 239, .3);
  border-radius: 8px;
  backdrop-filter: blur(8px);
  font-size: 13px;
  font-weight: 800;
}

.section {
  padding: 84px 0;
}

.section-inner {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
}

.section-light {
  background: var(--soft);
}

.section-white {
  background: #fff;
}

.section-blue {
  color: #fff;
  background: var(--navy);
}

.section-download {
  color: #fff;
  background: #0a2745;
}

.split-layout,
.media-layout,
.download-layout,
.faq-layout {
  display: grid;
  grid-template-columns: minmax(0, .88fr) minmax(0, 1.12fr);
  align-items: center;
  gap: 58px;
}

.media-layout {
  grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
}

.media-layout-reverse {
  grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
}

.download-layout {
  grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr);
}

.faq-layout {
  align-items: start;
}

h2 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.18;
}

.section-blue h2,
.section-download h2,
.reserve-band h2 {
  color: #fff;
}

h3 {
  margin: 0;
  color: var(--navy);
  font-size: 19px;
  line-height: 1.35;
}

p {
  margin: 0;
}

.lead-block,
.media-layout p,
.device-grid p,
.safety-list p,
.faq-list p,
.reserve-inner p {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.8;
}

.lead-block {
  display: grid;
  gap: 16px;
}

.section-blue p,
.section-blue .feature-list,
.section-download p {
  color: #c9ddf1;
}

.section-heading {
  max-width: 780px;
  margin-bottom: 34px;
}

.loop-grid,
.device-grid,
.value-grid {
  display: grid;
  gap: 14px;
}

.loop-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.device-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.value-grid {
  margin-top: 22px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.loop-grid article,
.device-grid article,
.value-grid article,
.safety-list article {
  padding: 22px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 12px 30px rgba(31, 77, 128, .07);
}

.loop-grid article {
  min-height: 198px;
  display: flex;
  flex-direction: column;
}

.loop-grid span {
  width: 42px;
  height: 42px;
  margin-bottom: 22px;
  display: inline-grid;
  place-items: center;
  color: var(--blue-2);
  background: #e7f4ff;
  border: 1px solid #bcdcf8;
  border-radius: 8px;
  font-weight: 900;
}

.loop-grid p,
.device-grid p,
.value-grid p {
  margin-top: 10px;
}

.screen-figure {
  margin: 0;
  overflow: hidden;
  background: #fff;
  border: 1px solid rgba(78, 137, 196, .32);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.section-blue .screen-figure {
  background: #071b32;
  border-color: rgba(121, 216, 233, .25);
  box-shadow: 0 26px 58px rgba(0, 12, 28, .32);
}

.screen-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  object-position: top center;
  background: #dce8f4;
}

.screen-figure figcaption {
  padding: 13px 16px 15px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.section-blue .screen-figure figcaption {
  color: #b7d3eb;
}

.feature-list {
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  list-style: none;
}

.feature-list li {
  position: relative;
  padding-left: 22px;
  line-height: 1.7;
}

.feature-list li::before {
  content: "";
  position: absolute;
  top: .72em;
  left: 0;
  width: 8px;
  height: 8px;
  background: var(--amber);
  border-radius: 50%;
}

.tag-cloud {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-cloud span {
  padding: 8px 12px;
  color: #174061;
  background: #eaf6ff;
  border: 1px solid #c8e3f7;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 800;
}

.safety-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.download-meta {
  margin-top: 18px;
  display: grid;
  gap: 8px;
}

.download-meta strong {
  color: #fff;
}

.unsigned-note {
  margin-top: 18px;
  padding-left: 14px;
  border-left: 3px solid var(--amber);
}

.download-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.download-card {
  min-width: 0;
  padding: 22px;
  display: grid;
  gap: 10px;
  color: #e8f6ff;
  background: rgba(255, 255, 255, .08);
  border: 1px solid rgba(148, 214, 232, .28);
  border-radius: 8px;
  transition: transform .18s ease, border-color .18s ease, background .18s ease;
}

.download-card:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, .12);
  border-color: rgba(120, 237, 247, .7);
}

.download-card.recommended {
  background: #145fc1;
  border-color: #57b9ff;
}

.download-type {
  width: fit-content;
  padding: 5px 9px;
  color: #07233f;
  background: #fff;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 900;
}

.download-card strong {
  font-size: 24px;
}

.download-card small,
.download-card span {
  color: #cce3f5;
  line-height: 1.5;
}

.download-card code {
  max-width: 100%;
  padding: 10px;
  color: #eaffff;
  background: rgba(3, 20, 38, .48);
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: 6px;
  font-size: 11px;
  line-height: 1.5;
  overflow-wrap: anywhere;
}

.faq-list {
  display: grid;
  gap: 10px;
}

.faq-list details {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.faq-list summary {
  padding: 18px 20px;
  color: var(--navy);
  cursor: pointer;
  font-weight: 850;
}

.faq-list p {
  padding: 0 20px 20px;
}

.reserve-band {
  padding: 58px 0;
  color: #fff;
  background: var(--navy);
}

.reserve-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 28px;
}

.reserve-inner p {
  max-width: 650px;
  margin-top: 12px;
  color: #c9ddf1;
}

.qr-pending {
  justify-self: end;
  padding: 12px 16px;
  color: #fff;
  background: rgba(255, 255, 255, .1);
  border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 8px;
  font-weight: 800;
}

html[data-qr-ready="true"] .qr-pending {
  display: none;
}

.qr-dialog {
  width: min(420px, calc(100% - 36px));
  padding: 26px;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 28px 80px rgba(3, 18, 38, .28);
}

.qr-dialog::backdrop {
  background: rgba(5, 18, 35, .58);
  backdrop-filter: blur(3px);
}

.qr-dialog h2 {
  margin-bottom: 16px;
  font-size: 28px;
}

.qr-dialog img {
  width: min(260px, 100%);
  aspect-ratio: 1;
  margin: 0 auto 16px;
  object-fit: contain;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.qr-dialog p:last-child {
  color: var(--muted);
  line-height: 1.7;
}

.dialog-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  color: var(--navy);
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 24px;
  line-height: 1;
}

.site-footer {
  padding: 32px 0;
  background: #fff;
  border-top: 1px solid var(--line);
}

.error-page {
  min-height: 100svh;
  display: grid;
  place-items: center;
  color: #fff;
  background:
    linear-gradient(90deg, rgba(7, 29, 53, .94), rgba(10, 45, 78, .78)),
    url("/assets/student-classroom.png");
  background-position: center top;
  background-size: cover;
}

.error-wrap {
  width: min(680px, calc(100% - 40px));
  display: grid;
  gap: 18px;
}

.error-wrap .brand {
  color: #fff;
}

.error-wrap h1 {
  margin: 0;
  font-size: clamp(40px, 7vw, 72px);
  line-height: 1.05;
}

.error-wrap p {
  max-width: 560px;
  color: #d9eaff;
  line-height: 1.75;
}

.footer-inner {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  color: var(--muted);
  font-size: 13px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 18px;
}

.footer-links a:hover {
  color: var(--blue-2);
}

@media (max-width: 980px) {
  .header-inner {
    width: min(100% - 32px, 1180px);
    min-height: 62px;
  }

  .nav-toggle {
    display: grid;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 16px;
    right: 16px;
    padding: 14px;
    display: grid;
    gap: 4px;
    background: rgba(255, 255, 255, .98);
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: var(--shadow);
    opacity: 0;
    transform: translateY(-8px);
    pointer-events: none;
    transition: opacity .18s ease, transform .18s ease;
  }

  .site-nav[data-open="true"] {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .site-nav > a,
  .product-entry-button,
  .header-reserve {
    width: 100%;
    justify-content: space-between;
    padding: 10px 12px;
    border-radius: 8px;
  }

  .site-nav > a {
    border-bottom: 0;
  }

  .product-menu {
    position: static;
    width: 100%;
    margin-top: 6px;
    display: none;
    opacity: 1;
    transform: none;
    pointer-events: auto;
    box-shadow: none;
  }

  .product-entry.is-open .product-menu {
    display: grid;
  }

  .hero {
    min-height: 600px;
    height: clamp(600px, calc(100svh - 84px), 680px);
    background-position: center, center, 62% top;
    background-size: 100% 100%, 100% 100%, auto 100%;
  }

  .hero-inner,
  .section-inner,
  .footer-inner {
    width: min(100% - 32px, 1180px);
  }

  .split-layout,
  .media-layout,
  .media-layout-reverse,
  .download-layout,
  .faq-layout,
  .reserve-inner {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .loop-grid,
  .device-grid,
  .value-grid,
  .safety-list,
  .download-cards {
    grid-template-columns: 1fr 1fr;
  }

  .qr-pending {
    justify-self: start;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    justify-items: start;
  }

  .footer-links {
    justify-content: flex-start;
  }
}

@media (max-width: 620px) {
  html {
    scroll-padding-top: 72px;
  }

  .brand {
    font-size: 18px;
  }

  .brand img {
    width: 34px;
    height: 34px;
  }

  .hero {
    min-height: 610px;
    height: clamp(610px, calc(100svh - 72px), 660px);
    background-image:
      linear-gradient(180deg, rgba(5, 18, 34, .9) 0%, rgba(7, 29, 53, .72) 48%, rgba(7, 29, 53, .34) 100%),
      linear-gradient(180deg, rgba(7, 29, 53, .08) 0%, rgba(7, 29, 53, .2) 100%),
      url("/assets/student-classroom.png");
    background-position: center, center, 58% top;
    background-size: 100% 100%, 100% 100%, auto 100%;
  }

  .hero-inner {
    padding: 46px 0 96px;
  }

  .hero h1 {
    font-size: 66px;
  }

  .hero-lede {
    font-size: 31px;
  }

  .hero-copy {
    font-size: 17px;
  }

  .hero-actions,
  .button {
    width: 100%;
  }

  .hero-status {
    flex-wrap: wrap;
  }

  .section {
    padding: 64px 0;
  }

  h2 {
    font-size: 30px;
  }

  .loop-grid,
  .device-grid,
  .value-grid,
  .safety-list,
  .download-cards {
    grid-template-columns: 1fr;
  }

  .loop-grid article {
    min-height: 0;
  }

  .download-card strong {
    font-size: 22px;
  }

  .reserve-band {
    padding: 48px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}

/* 2026-08-08 统一科技蓝视觉：官网与三端产品保持同一套材质和层级。 */
:root {
  --ink: #132f40;
  --muted: #607b8b;
  --soft: #edf7fa;
  --soft-2: #f6fafb;
  --navy: #061c2d;
  --navy-2: #0a3448;
  --line: #d7e7ec;
  --blue: #087f96;
  --blue-2: #075f76;
  --cyan: #19b9c9;
  --amber: #dca640;
  --shadow: 0 22px 55px rgba(7, 47, 66, .12);
}

body {
  background:
    radial-gradient(circle at 90% 8%, rgba(25, 185, 201, .09), transparent 24%),
    var(--soft-2);
}

.site-header {
  border-bottom-color: rgba(7, 94, 117, .11);
  background: rgba(247, 251, 252, .9);
  box-shadow: 0 5px 24px rgba(7, 38, 54, .035);
}

.header-inner {
  min-height: 72px;
}

.brand {
  color: #0a3042;
  letter-spacing: .02em;
}

.site-nav {
  gap: 20px;
  color: #466675;
  font-size: 13px;
  font-weight: 720;
}

.site-nav > a:hover,
.site-nav > a[aria-current="true"] {
  color: #075f76;
  border-bottom-color: #19b9c9;
}

.product-entry-button {
  min-height: 42px;
  gap: 9px;
  padding: 0 12px 0 9px;
  border: 1px solid #d4e7ec;
  border-radius: 13px;
  color: #16384a;
  background: linear-gradient(145deg, rgba(255, 255, 255, .96), rgba(237, 246, 248, .9));
  box-shadow: 0 6px 18px rgba(7, 49, 68, .06), inset 0 1px 0 rgba(255, 255, 255, .88);
}

.product-entry-button:hover,
.product-entry.is-open .product-entry-button {
  color: #075f76;
  border-color: rgba(25, 185, 201, .38);
  background: #f7fdfe;
  box-shadow: 0 9px 22px rgba(7, 72, 91, .1), inset 0 1px 0 #fff;
  transform: translateY(-1px);
}

.product-entry-icon {
  display: grid;
  width: 28px;
  height: 28px;
  place-items: center;
  border-radius: 9px;
  color: #087b90;
  background: #dff5f7;
}

.product-entry-label {
  white-space: nowrap;
}

.product-entry-chevron {
  color: #7a969f;
  transition: transform .18s ease;
}

.product-entry.is-open .product-entry-chevron {
  transform: rotate(180deg);
}

.product-menu {
  top: calc(100% + 13px);
  width: 286px;
  padding: 9px;
  gap: 5px;
  border-color: rgba(13, 111, 133, .16);
  border-radius: 17px;
  background: rgba(250, 253, 254, .98);
  box-shadow: 0 25px 65px rgba(5, 39, 55, .18);
}

.product-menu::before {
  content: "";
  position: absolute;
  top: -6px;
  right: 26px;
  width: 12px;
  height: 12px;
  border-top: 1px solid rgba(13, 111, 133, .16);
  border-left: 1px solid rgba(13, 111, 133, .16);
  background: #fbfefe;
  transform: rotate(45deg);
}

.product-menu a {
  grid-template-columns: 38px minmax(0, 1fr);
  align-items: center;
  gap: 11px;
  padding: 10px;
  border: 1px solid transparent;
  border-radius: 12px;
}

.product-menu a:hover {
  border-color: #d9edf1;
  background: #edf8fa;
}

.product-menu .product-menu-icon {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 11px;
  color: #096e82;
  background: linear-gradient(145deg, #d6f3f6, #ebf9fa);
  font-size: 12px;
  font-weight: 850;
}

.product-menu a > span:last-child {
  display: grid;
  gap: 2px;
}

.product-menu strong {
  color: #133749;
  font-size: 14px;
}

.product-menu small {
  color: #748e9a;
  font-size: 11px;
  font-weight: 600;
}

.header-reserve {
  border-radius: 12px;
  background: linear-gradient(135deg, #087b90 0%, #07576c 100%);
  border-color: rgba(87, 219, 230, .42);
  box-shadow: 0 10px 24px rgba(6, 90, 111, .16), inset 0 1px 0 rgba(255, 255, 255, .2);
}

.header-reserve:hover {
  background: linear-gradient(135deg, #0a8da2 0%, #086378 100%);
  box-shadow: 0 14px 28px rgba(6, 90, 111, .22), inset 0 1px 0 rgba(255, 255, 255, .24);
}

.hero {
  min-height: 590px;
  height: clamp(590px, calc(100svh - 72px), 720px);
  color: #d6ebf1;
  background-color: #071f31;
  background-image:
    linear-gradient(90deg, rgba(4, 20, 33, .96) 0%, rgba(5, 29, 43, .83) 36%, rgba(5, 35, 49, .38) 64%, rgba(5, 37, 51, .14) 100%),
    linear-gradient(180deg, rgba(3, 18, 29, .12) 0%, rgba(3, 25, 36, .12) 60%, rgba(3, 22, 34, .58) 100%),
    url("/assets/student-courses-20260808.webp");
  background-position: center, center, center top;
  background-size: 100% 100%, 100% 100%, cover;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(98, 222, 233, .06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(98, 222, 233, .06) 1px, transparent 1px);
  background-size: 30px 30px;
  mask-image: linear-gradient(90deg, #000 0%, rgba(0,0,0,.6) 42%, transparent 72%);
  pointer-events: none;
}

.hero-inner {
  padding-top: 64px;
}

.hero .eyebrow {
  color: #62dce8;
  letter-spacing: .1em;
}

.hero h1 {
  color: #cfe6ed;
  font-weight: 820;
  letter-spacing: 0;
  text-shadow: 0 15px 38px rgba(0, 16, 28, .32);
}

.hero-lede {
  color: #edf7f9;
  font-weight: 760;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 620px;
  color: #b8ced7;
}

.button {
  border-radius: 13px;
}

.button-primary {
  color: #eaffff;
  background: linear-gradient(135deg, #09879b 0%, #075b70 100%);
  border-color: rgba(102, 224, 234, .5);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .16), 0 12px 28px rgba(2, 38, 52, .24);
}

.button-secondary {
  color: #153d4e;
  background: rgba(232, 246, 249, .9);
  border-color: rgba(202, 231, 236, .74);
}

.hero-status span {
  min-height: 36px;
  border-color: rgba(92, 219, 230, .25);
  border-radius: 11px;
  color: #cde8ed;
  background: rgba(6, 35, 49, .66);
  font-size: 12px;
  font-weight: 720;
}

.section {
  padding: 92px 0;
}

.section-light {
  background:
    radial-gradient(circle at 10% 10%, rgba(25, 185, 201, .07), transparent 28%),
    #edf7fa;
}

.section-white {
  background: #f9fcfd;
}

.section-blue {
  background:
    linear-gradient(rgba(74, 208, 221, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(74, 208, 221, .055) 1px, transparent 1px),
    linear-gradient(135deg, #061c2d 0%, #092f42 100%);
  background-size: 28px 28px, 28px 28px, auto;
}

.section-download,
.reserve-band {
  background: linear-gradient(135deg, #061c2d 0%, #0a3549 100%);
}

.loop-grid article,
.device-grid article,
.value-grid article,
.safety-list article {
  border-color: #d8e8ed;
  border-radius: 17px;
  box-shadow: 0 14px 36px rgba(7, 58, 78, .055);
}

.loop-grid span {
  color: #08778d;
  background: #e0f4f7;
  border-color: #c5e8ed;
  border-radius: 12px;
}

.screen-figure {
  border-color: rgba(20, 126, 151, .22);
  border-radius: 18px;
  background: #edf6f8;
  box-shadow: 0 24px 60px rgba(5, 50, 68, .13);
}

.section-blue .screen-figure {
  border-color: rgba(99, 221, 231, .25);
  border-radius: 18px;
  background: #071f31;
  box-shadow: 0 28px 70px rgba(0, 15, 25, .38);
}

.screen-figure img {
  aspect-ratio: 16 / 9;
  object-fit: cover;
  object-position: top center;
  background: #e4f0f3;
}

.screen-figure figcaption {
  padding: 14px 17px 16px;
  color: #607b89;
  font-size: 12px;
}

.feature-list li::before {
  background: #dca640;
  box-shadow: 0 0 0 4px rgba(220, 166, 64, .12);
}

.tag-cloud span {
  color: #155165;
  background: #e6f5f7;
  border-color: #cbe7ec;
  border-radius: 11px;
}

.download-card,
.faq-list details,
.qr-dialog,
.dialog-close {
  border-radius: 15px;
}

.download-card.recommended {
  background: linear-gradient(145deg, #0b758a, #075268);
  border-color: rgba(105, 224, 234, .62);
}

.download-type {
  border-radius: 9px;
}

.site-footer {
  background: #f7fbfc;
  border-top-color: #dbe9ed;
}

@media (max-width: 980px) {
  .product-menu::before { display: none; }
  .site-nav { border-radius: 17px; }
  .product-entry-button { padding-left: 9px; }
  .hero {
    background-position: center, center, 54% top;
    background-size: 100% 100%, 100% 100%, auto 100%;
  }
}

@media (max-width: 620px) {
  .hero {
    min-height: 620px;
    height: clamp(620px, calc(100svh - 68px), 690px);
    background-image:
      linear-gradient(180deg, rgba(4, 20, 33, .92) 0%, rgba(5, 30, 44, .78) 54%, rgba(4, 28, 40, .62) 100%),
      linear-gradient(180deg, rgba(3, 19, 30, .05), rgba(3, 22, 34, .38)),
      url("/assets/student-courses-20260808.webp");
    background-position: center, center, 58% top;
    background-size: 100% 100%, 100% 100%, auto 100%;
  }
  .hero::before { mask-image: linear-gradient(180deg, rgba(0,0,0,.8), transparent 78%); }
  .hero h1 { color: #d7e9ee; }
  .hero-lede { color: #eef8fa; }
  .section { padding: 70px 0; }
  .screen-figure { border-radius: 15px; }
}

.site-map-page {
  min-height: 100svh;
  color: #dceff3;
  background:
    linear-gradient(rgba(83, 215, 226, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(83, 215, 226, .055) 1px, transparent 1px),
    radial-gradient(circle at 88% 8%, rgba(30, 181, 197, .2), transparent 28%),
    linear-gradient(145deg, #051928 0%, #082f42 58%, #075f71 100%);
  background-size: 30px 30px, 30px 30px, auto, auto;
}

.site-map-header {
  border-bottom: 1px solid rgba(127, 223, 232, .13);
  background: rgba(4, 24, 37, .62);
  backdrop-filter: blur(18px);
}

.site-map-header-inner,
.site-map-main,
.site-map-footer {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
}

.site-map-header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-map-page .brand {
  color: #e7f5f7;
}

.site-map-back,
.site-map-contact {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  padding: 0 15px;
  border: 1px solid rgba(114, 222, 231, .3);
  border-radius: 12px;
  color: #d9f4f7;
  background: rgba(222, 249, 251, .07);
  font-size: 12px;
  font-weight: 750;
}

.site-map-main {
  padding: 76px 0 90px;
}

.site-map-intro {
  max-width: 720px;
}

.site-map-intro h1 {
  margin: 8px 0 14px;
  color: #e7f4f7;
  font-size: clamp(44px, 7vw, 76px);
  line-height: 1;
  letter-spacing: 0;
}

.site-map-intro > p:last-child {
  color: rgba(209, 235, 239, .68);
  font-size: 17px;
  line-height: 1.75;
}

.site-map-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 17px;
  margin-top: 44px;
}

.site-map-card {
  position: relative;
  min-height: 350px;
  padding: 28px;
  overflow: hidden;
  border: 1px solid rgba(133, 221, 230, .17);
  border-radius: 20px;
  background: rgba(232, 249, 251, .075);
  box-shadow: 0 24px 60px rgba(0, 13, 22, .18);
  backdrop-filter: blur(15px);
}

.site-map-card.featured {
  background: linear-gradient(145deg, rgba(22, 161, 177, .22), rgba(226, 248, 251, .075));
}

.site-map-number {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: 12px;
  color: #73e1ea;
  background: rgba(99, 221, 231, .1);
  font-size: 12px;
  font-weight: 850;
}

.site-map-card h2 {
  margin: 23px 0 9px;
  color: #e9f7f9;
  font-size: 25px;
}

.site-map-card > p {
  max-width: 480px;
  margin: 0;
  color: rgba(207, 233, 237, .62);
  font-size: 13px;
  line-height: 1.7;
}

.site-map-card nav {
  display: grid;
  gap: 4px;
  margin-top: 22px;
}

.site-map-card nav a {
  display: flex;
  min-height: 39px;
  align-items: center;
  justify-content: space-between;
  padding: 0 11px;
  border-radius: 10px;
  color: #cfe8ed;
  font-size: 12px;
  font-weight: 650;
  transition: background .18s ease, color .18s ease, transform .18s ease;
}

.site-map-card nav a:hover {
  color: #f3fcfd;
  background: rgba(127, 226, 234, .1);
  transform: translateX(3px);
}

.site-map-card nav a span {
  color: #5ed5df;
}

.contact-card {
  min-height: 280px;
  background: linear-gradient(145deg, rgba(226, 172, 61, .12), rgba(229, 249, 251, .065));
}

.site-map-contact {
  margin-top: 28px;
  color: #082d3b;
  background: #8beaf1;
}

.site-map-footer {
  display: flex;
  min-height: 86px;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid rgba(127, 223, 232, .12);
  color: rgba(204, 231, 235, .5);
  font-size: 12px;
}

.site-map-footer a:hover {
  color: #77dfe7;
}

@media (max-width: 760px) {
  .site-map-header-inner,
  .site-map-main,
  .site-map-footer { width: min(100% - 30px, 1120px); }
  .site-map-main { padding: 56px 0 70px; }
  .site-map-grid { grid-template-columns: 1fr; margin-top: 34px; }
  .site-map-card { min-height: auto; padding: 22px; }
  .site-map-footer { align-items: flex-start; flex-direction: column; justify-content: center; gap: 6px; }
}