@import "_tokens.css";

/* ═══ 重置 ═══ */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 20px);
}

body {
  margin: 0;
  color: var(--color-text-primary);
  background: var(--color-background);
  font-family:
    "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC",
    "Source Han Sans SC", Arial, sans-serif;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.modal-open {
  overflow: hidden;
}

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

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

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

button {
  border: 0;
}

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

.skip-link {
  position: fixed;
  left: 12px;
  top: -100px;
  z-index: 9999;
  padding: 10px 14px;
  color: #fff;
  background: var(--color-primary-pressed);
  border-radius: 10px;
  transition: top .2s ease;
}

.skip-link:focus {
  top: 12px;
}

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

.section {
  position: relative;
  padding: 96px 0;
}

.section--soft {
  position: relative;
  background:
    linear-gradient(180deg, rgba(239,247,255,.8), rgba(250,253,255,.98)),
    var(--color-surface-subtle);
}

.section--compact {
  padding: 72px 0;
}

.section__head {
  max-width: 760px;
  margin-bottom: 42px;
}

.section__head--center {
  margin-inline: auto;
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 12px;
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .08em;
}

.eyebrow::before {
  width: 28px;
  height: 3px;
  content: "";
  background: linear-gradient(90deg, var(--color-primary), var(--color-cyan));
  border-radius: 999px;
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

h1,
h2,
h3,
h4 {
  line-height: 1.24;
  letter-spacing: 0;
}

h1 {
  margin-bottom: 20px;
  color: var(--color-text-primary);
  font-size: clamp(44px, 6vw, 82px);
  font-weight: 900;
}

h2 {
  margin-bottom: 16px;
  color: var(--color-text-primary);
  font-size: clamp(32px, 4vw, 50px);
  font-weight: 900;
}

h3 {
  margin-bottom: 12px;
  color: var(--color-text-primary);
  font-size: clamp(22px, 2.4vw, 28px);
  font-weight: 850;
}

h4 {
  margin-bottom: 8px;
  font-size: 18px;
}

.lead {
  max-width: 760px;
  color: var(--color-text-secondary);
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.8;
}

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

.text-center {
  text-align: center;
}

.note {
  padding: 18px 20px;
  color: var(--color-text-secondary);
  background: var(--color-primary-container);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-sm);
}

.todo-note {
  margin-top: 18px;
  padding: 14px 16px;
  color: #795000;
  background: #fff8dc;
  border: 1px solid #efd67d;
  border-radius: 12px;
  font-size: 14px;
}

.badges,
.actions,
.inline-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 6px 12px;
  color: var(--color-primary);
  background: rgba(17,107,229,.08);
  border: 1px solid rgba(17,107,229,.15);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 800;
}

.badge--cyan {
  color: #087080;
  background: rgba(20,184,207,.1);
  border-color: rgba(20,184,207,.2);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 48px;
  padding: 12px 20px;
  cursor: pointer;
  white-space: nowrap;
  transition:
    transform .2s ease,
    box-shadow .2s ease,
    background .2s ease,
    border-color .2s ease;
  border-radius: 13px;
  font-weight: 850;
}

.button:hover {
  transform: translateY(-2px);
}

.button:focus-visible,
.icon-button:focus-visible,
.nav__link:focus-visible,
.mobile-bar__link:focus-visible {
  outline: 3px solid rgba(20,184,207,.36);
  outline-offset: 3px;
}

.button--primary {
  color: var(--color-text-inverse);
  background: var(--color-primary);
  box-shadow: 0 12px 26px rgba(10,89,205,.22);
}

.button--primary:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 16px 34px rgba(10,89,205,.28);
}

.button--secondary {
  color: var(--color-primary-pressed);
  background: var(--color-surface);
  border: 1px solid rgba(11,80,199,.2);
  box-shadow: var(--shadow-sm);
}

.button--ghost {
  color: var(--color-primary);
  background: rgba(17,107,229,.06);
}

.button--block {
  width: 100%;
}

.text-link {
  color: var(--color-primary);
  font-weight: 850;
}

.text-link:hover {
  color: var(--color-primary-pressed);
}

.card {
  height: 100%;
  padding: 28px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.card--interactive {
  transition:
    transform .22s ease,
    border-color .22s ease,
    box-shadow .22s ease;
}

.card--interactive:hover {
  transform: translateY(-5px);
  border-color: rgba(17,107,229,.28);
  box-shadow: var(--shadow-md);
}

.card__icon {
  display: grid;
  width: 58px;
  height: 58px;
  margin-bottom: 18px;
  color: #fff;
  background: linear-gradient(145deg, var(--color-primary), var(--color-cyan));
  border-radius: 18px;
  place-items: center;
  box-shadow: 0 14px 30px rgba(11,91,205,.18);
}

.card__icon svg {
  width: 28px;
  height: 28px;
}

.card__meta {
  margin-bottom: 8px;
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 850;
}

.grid {
  display: grid;
  gap: 24px;
}

.grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

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

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

.culture-group + .culture-group {
  margin-top: 32px;
}

.culture-group__head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.culture-group__head h3,
.culture-group__head p {
  margin: 0;
}

.culture-group__head p {
  margin-top: 4px;
}

.culture-group__mark {
  display: grid;
  min-width: 64px;
  height: 40px;
  padding: 0 12px;
  place-items: center;
  border-radius: 8px;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-weight: 850;
}

.culture-group__mark--cyan {
  background: var(--color-cyan);
}

.card--accent {
  background:
    radial-gradient(circle at 90% 10%, rgba(20,184,207,.16), transparent 34%),
    linear-gradient(145deg, rgba(17,107,229,.08), rgba(20,184,207,.06)),
    var(--color-surface);
  border-color: rgba(17,107,229,.22);
}

.site-header {
  position: sticky;
  z-index: 1000;
  top: 0;
  height: var(--header-height);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(18px);
}

.site-header__inner {
  display: flex;
  height: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  flex-shrink: 0;
  align-items: center;
  gap: 12px;
}

.brand__mark {
  display: grid;
  width: 44px;
  height: 44px;
  overflow: hidden;
  color: #fff;
  background: linear-gradient(145deg, var(--color-primary), var(--color-cyan));
  border-radius: 13px;
  box-shadow: 0 9px 20px rgba(16,93,205,.16);
  place-items: center;
}

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

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand__name {
  color: var(--color-text-primary);
  font-size: 20px;
  font-weight: 900;
}

.brand__tagline {
  margin-top: 4px;
  color: var(--color-text-muted);
  font-size: 11px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav__link {
  position: relative;
  padding: 12px 13px;
  color: var(--color-text-secondary);
  border-radius: 10px;
  font-size: 15px;
  font-weight: 750;
  transition: color .2s ease, background .2s ease;
}

.nav__link:hover,
.nav__link.is-active {
  color: var(--color-primary);
  background: rgba(17,107,229,.07);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.header-actions .button {
  min-height: 42px;
  padding: 9px 15px;
  font-size: 14px;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  cursor: pointer;
  color: var(--color-primary-pressed);
  background: rgba(17,107,229,.07);
  border-radius: 12px;
}

.hero {
  position: relative;
  min-height: 620px;
  overflow: hidden;
  background:
    radial-gradient(circle at 12% 15%, rgba(20,184,207,.16), transparent 22%),
    radial-gradient(circle at 85% 20%, rgba(17,107,229,.14), transparent 26%),
    linear-gradient(180deg, #f8fcff 0%, #edf7ff 78%, #fff 100%);
}

.hero::before,
.page-hero::before {
  position: absolute;
  inset: 0;
  pointer-events: none;
  content: "";
  opacity: .55;
  background-image:
    linear-gradient(rgba(35,113,213,.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(35,113,213,.055) 1px, transparent 1px);
  background-size: 76px 76px;
  mask-image: linear-gradient(180deg, #000, transparent 82%);
}

.hero__inner {
  position: relative;
  z-index: 2;
  display: grid;
  min-height: 620px;
  align-items: center;
  gap: 72px;
  grid-template-columns: minmax(0, 1.05fr) minmax(420px, .95fr);
}

.hero__copy {
  padding: 72px 0;
}

.hero__copy h1 { font-size: 58px; }

.hero__copy .lead {
  margin-bottom: 30px;
}

.hero__note {
  margin-top: 20px;
  color: var(--color-text-muted);
  font-size: 14px;
}

.hero-visual {
  position: relative;
  min-height: 520px;
}

.hero-visual.device-mode-desktop .device--mobile { display: none; }
.hero-visual.device-mode-mobile .device--desktop { display: none; }

/* 默认隐藏手机，JS 检测到手机端再显示 */
.hero-visual .device--mobile { display: none; }
.hero-visual.device-mode-mobile .device--mobile { display: block; }

@media (max-width: 900px) {
  .hero-visual.device-mode-desktop .device--mobile { display: none; }
  .hero-visual .device--mobile,
  .hero-visual .device-mockup--mobile {
    display: block;
    position: static;
    width: min(100%, 280px);
    margin: 0 auto;
  }
  .hero-visual .device--desktop,
  .hero-visual .device-mockup--desktop { display: none; }
}

.hero-visual::before {
  position: absolute;
  z-index: -1;
  width: 460px;
  height: 460px;
  content: "";
  background: radial-gradient(circle, rgba(17,107,229,.15), transparent 68%);
  border-radius: 50%;
  inset: 40px 0 auto auto;
}

.device-mockup,
.device {
  overflow: hidden;
  background: var(--color-surface);
  border: 1px solid rgba(17,107,229,.16);
  box-shadow: 0 30px 80px rgba(6,58,155,.18);
}

.device-mockup--desktop,
.device--desktop {
  padding: 12px 12px 20px;
  border-radius: 26px;
}

.device-mockup--desktop::after,
.device--desktop::after {
  display: block;
  width: 180px;
  height: 10px;
  margin: 20px auto -10px;
  content: "";
  background: linear-gradient(90deg, transparent, rgba(7,58,155,.35), transparent);
  border-radius: 50%;
}

.device-mockup--mobile,
.device--mobile {
  padding: 10px;
  border-radius: 34px;
}

.device-mockup__screen,
.device__screen {
  overflow: hidden;
  background: linear-gradient(180deg, #eef7ff, #fdfefe);
  border-radius: 18px;
  aspect-ratio: 16 / 10;
}

.device-mockup--mobile .device-mockup__screen,
.device--mobile .device__screen {
  border-radius: 25px;
  aspect-ratio: 9 / 18;
}

/* Hero 专用定位（覆盖上方的通用视觉样式） */
.hero .device--desktop,
.hero .device-mockup--desktop {
  position: absolute;
  width: 520px;
  right: 0;
  top: 70px;
}

.hero .device--mobile,
.hero .device-mockup--mobile {
  position: absolute;
  z-index: 3;
  width: 215px;
  left: 5px;
  bottom: 42px;
}

@media (max-width: 900px) {
  .device-mockup--desktop::after,
  .device--desktop::after {
    display: none;
  }
}

.placeholder-media {
  display: grid;
  width: 100%;
  height: 100%;
  min-height: 220px;
  padding: 24px;
  color: var(--color-primary);
  background:
    linear-gradient(135deg, rgba(17,107,229,.08), rgba(20,184,207,.1)),
    #f7fbff;
  border: 1px dashed rgba(17,107,229,.28);
  border-radius: inherit;
  text-align: center;
  place-items: center;
}

.placeholder-media__inner {
  max-width: 320px;
}

.placeholder-media strong {
  display: block;
  margin-bottom: 8px;
  font-size: 18px;
}

.placeholder-media span {
  color: var(--color-text-muted);
  font-size: 13px;
}

.page-hero {
  position: relative;
  overflow: hidden;
  padding: 112px 0 82px;
  background:
    radial-gradient(circle at 75% 15%, rgba(20,184,207,.14), transparent 25%),
    linear-gradient(180deg, #f7fbff, #eef7ff);
}

.page-hero__inner {
  position: relative;
  z-index: 2;
  max-width: 880px;
}

.page-hero h1 {
  font-size: clamp(42px, 5vw, 68px);
}

.page-hero .lead {
  margin-bottom: 26px;
}

.split {
  display: grid;
  align-items: center;
  gap: 60px;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}

.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.pill {
  padding: 8px 13px;
  color: var(--color-primary);
  background: rgba(17,107,229,.07);
  border: 1px solid rgba(17,107,229,.13);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 800;
}

.number-list {
  display: grid;
  gap: 16px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.number-list__item {
  display: grid;
  min-height: 92px;
  padding: 20px 22px;
  align-items: center;
  gap: 18px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  grid-template-columns: auto 1fr;
}

.number-list__number {
  display: grid;
  width: 48px;
  height: 48px;
  color: #fff;
  background: linear-gradient(145deg, var(--color-primary), var(--color-cyan));
  border-radius: 50%;
  font-weight: 900;
  place-items: center;
}

.number-list__title {
  margin: 0 0 4px;
  color: var(--color-text-primary);
  font-size: 19px;
  font-weight: 850;
}

.number-list__desc {
  margin: 0;
  color: var(--color-text-muted);
}

.course-card {
  display: flex;
  flex-direction: column;
}

.course-card__top {
  min-height: 180px;
  padding: 24px;
  background:
    radial-gradient(circle at 86% 20%, rgba(20,184,207,.24), transparent 28%),
    linear-gradient(145deg, #0a4fbd, #1177e9);
  border-radius: 20px;
  color: #fff;
}

.course-card__top h3 {
  color: #fff;
}

.course-card__body {
  display: flex;
  flex: 1;
  flex-direction: column;
  padding-top: 22px;
}

.course-card__body .actions {
  margin-top: auto;
  padding-top: 18px;
}

.list {
  padding-left: 1.2em;
  margin: 14px 0 0;
  color: var(--color-text-secondary);
}

.list li + li {
  margin-top: 8px;
}

.service-strip {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.service-item {
  display: flex;
  min-height: 120px;
  padding: 22px;
  align-items: center;
  gap: 18px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.service-item__icon {
  display: grid;
  width: 54px;
  height: 54px;
  flex: 0 0 auto;
  color: #fff;
  background: linear-gradient(145deg, var(--color-primary), var(--color-cyan));
  border-radius: 17px;
  place-items: center;
}

.service-item h3 {
  margin-bottom: 4px;
  font-size: 20px;
}

.service-item p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 14px;
}

.platform-card {
  text-align: center;
}

.platform-card .card__icon {
  margin-inline: auto;
}

.platform-card .button {
  width: 100%;
  margin-top: 12px;
}

.screenshot-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: 1.25fr .75fr;
  align-items: end;
}

.screenshot-grid .device-mockup--desktop {
  max-width: 520px;
  justify-self: end;
}

.screenshot-grid .device-mockup--mobile {
  max-width: 260px;
}

.screenshot-grid .device-mockup__screen img {
  transform: scale(1.04);
}

.screenshot-grid .placeholder-media {
  min-height: 420px;
}

.timeline {
  position: relative;
  display: grid;
  gap: 20px;
  max-width: 900px;
  margin: 0 auto;
}

.timeline::before {
  position: absolute;
  width: 3px;
  content: "";
  background: linear-gradient(var(--color-primary), var(--color-cyan));
  border-radius: 999px;
  inset: 20px auto 20px 26px;
}

.timeline__item {
  position: relative;
  padding: 25px 28px 25px 82px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.timeline__dot {
  position: absolute;
  display: grid;
  width: 48px;
  height: 48px;
  color: #fff;
  background: linear-gradient(145deg, var(--color-primary), var(--color-cyan));
  border: 6px solid #eef7ff;
  border-radius: 50%;
  font-weight: 900;
  place-items: center;
  left: 3px;
  top: 26px;
}

.module-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.module-card {
  padding: 26px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.module-card__head {
  display: flex;
  margin-bottom: 18px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.module-card__index {
  color: var(--color-cyan);
  font-size: 15px;
  font-weight: 900;
}

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

.lesson-list li {
  padding: 13px 14px;
  color: var(--color-text-secondary);
  background: var(--color-surface-subtle);
  border-radius: 11px;
}

.lesson-code {
  margin-right: 8px;
  color: var(--color-primary);
  font-weight: 900;
}

.team-group + .team-group {
  margin-top: 68px;
}

.team-group__head {
  display: flex;
  margin-bottom: 28px;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
}

.team-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.team-card {
  overflow: hidden;
  padding: 0;
}

.team-card__image {
  height: 205px;
  background: linear-gradient(145deg, #edf6ff, #f7fcff);
}

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

.team-card__body {
  padding: 24px;
}

.team-card__role {
  margin-bottom: 10px;
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 850;
}

.team-card__bio {
  color: var(--color-text-secondary);
  font-size: 15px;
}

.team-card__bio ul {
  padding-left: 1.15em;
  margin: 12px 0 0;
}

.team-card__bio li + li {
  margin-top: 6px;
}

.team-card--compact .team-card__image {
  height: 150px;
}

.advisor-panel {
  display: grid;
  padding: 30px;
  align-items: center;
  gap: 24px;
  background:
    radial-gradient(circle at 90% 10%, rgba(20,184,207,.18), transparent 32%),
    linear-gradient(135deg, #eff7ff, #fff);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  grid-template-columns: auto 1fr;
}

.advisor-panel__icon {
  display: grid;
  width: 88px;
  height: 88px;
  color: #fff;
  background: linear-gradient(145deg, var(--color-primary), var(--color-cyan));
  border-radius: 28px;
  place-items: center;
}

.faq {
  display: grid;
  gap: 12px;
  max-width: 900px;
  margin: 0 auto;
}

.faq details {
  overflow: hidden;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 15px;
  box-shadow: 0 8px 25px rgba(19,75,153,.06);
}

.faq summary {
  position: relative;
  padding: 20px 56px 20px 22px;
  cursor: pointer;
  color: var(--color-text-primary);
  font-weight: 850;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  position: absolute;
  right: 22px;
  top: 50%;
  content: "+";
  color: var(--color-primary);
  font-size: 24px;
  transform: translateY(-50%);
}

.faq details[open] summary::after {
  content: "−";
}

.faq__answer {
  padding: 0 22px 22px;
  color: var(--color-text-secondary);
}

.cta-panel {
  position: relative;
  overflow: hidden;
  padding: 52px;
  color: #fff;
  background:
    radial-gradient(circle at 85% 10%, rgba(56,209,223,.55), transparent 28%),
    linear-gradient(135deg, #073a9b, #0c65d7 60%, #13a9c5);
  border-radius: var(--radius-lg);
  box-shadow: 0 28px 70px rgba(6,59,155,.24);
}

.cta-panel::after {
  position: absolute;
  width: 420px;
  height: 420px;
  content: "";
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 50%;
  right: -190px;
  bottom: -250px;
}

.cta-panel h2,
.cta-panel h3 {
  color: #fff;
}

.cta-panel p {
  max-width: 720px;
  color: rgba(255,255,255,.84);
}

.cta-panel .button--secondary {
  border-color: rgba(255,255,255,.28);
}

.contact-layout {
  display: grid;
  align-items: center;
  gap: 36px;
  grid-template-columns: minmax(0, 1fr) auto;
}

.qr-box {
  width: 210px;
  padding: 14px;
  background: var(--color-surface);
  border-radius: 20px;
  box-shadow: 0 18px 40px rgba(1,42,115,.2);
}

.qr-box img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 12px;
}

.contact-info {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

.contact-line {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text-secondary);
  font-weight: 750;
}

.contact-line strong {
  color: var(--color-primary);
}

.cta-panel .contact-line {
  color: rgba(255,255,255,.82);
}

.cta-panel .contact-line strong {
  color: #fff;
}

.site-footer {
  color: rgba(255,255,255,.8);
  background: #061c4b;
}

.site-footer__main {
  display: grid;
  padding: 58px 0 38px;
  gap: 40px;
  grid-template-columns: 1.35fr repeat(4, minmax(110px, .5fr));
}

.site-footer h3,
.site-footer h4 {
  color: #fff;
}

.site-footer__brand p {
  max-width: 410px;
  color: rgba(255,255,255,.68);
}

.footer-links {
  display: grid;
  gap: 9px;
}

.footer-links a,
.footer-links button {
  color: rgba(255,255,255,.7);
  font-size: 14px;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
  font-weight: inherit;
  text-align: left;
}
.footer-links a:hover,
.footer-links button:hover {
  color: #fff;
}

.site-footer__bottom {
  display: flex;
  padding: 22px 0 28px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid rgba(255,255,255,.1);
  color: rgba(255,255,255,.55);
  font-size: 13px;
}

.legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.floating-contact {
  position: fixed;
  z-index: 990;
  right: 22px;
  bottom: 28px;
}

.floating-contact__button {
  display: flex;
  padding: 12px 16px;
  cursor: pointer;
  align-items: center;
  gap: 8px;
  color: #fff;
  background: linear-gradient(135deg, var(--color-primary), var(--color-cyan));
  border-radius: 999px;
  box-shadow: 0 16px 38px rgba(7,82,186,.26);
  font-weight: 850;
  white-space: nowrap;
}

.mobile-bar {
  position: fixed;
  z-index: 985;
  display: none;
  height: 62px;
  background: rgba(255,255,255,.94);
  border-top: 1px solid var(--color-border);
  box-shadow: 0 -8px 28px rgba(15,70,145,.1);
  backdrop-filter: blur(14px);
  inset: auto 0 0;
}

.mobile-bar__link {
  display: flex;
  flex: 1;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--color-primary-pressed);
  font-weight: 850;
}

.mobile-bar__link + .mobile-bar__link {
  border-left: 1px solid var(--color-border);
}

.modal {
  position: fixed;
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(5,24,59,.62);
  backdrop-filter: blur(10px);
  inset: 0;
}

.modal.is-open {
  display: flex;
}

.modal__dialog {
  position: relative;
  width: min(100%, 460px);
  padding: 32px;
  background: var(--color-surface);
  border-radius: 26px;
  box-shadow: 0 30px 90px rgba(0,26,78,.35);
  text-align: center;
}

.modal__close {
  position: absolute;
  display: grid;
  width: 40px;
  height: 40px;
  cursor: pointer;
  color: var(--color-text-secondary);
  background: var(--color-surface-subtle);
  border-radius: 50%;
  place-items: center;
  right: 16px;
  top: 16px;
}

.modal__qr {
  width: min(100%, 260px);
  margin: 20px auto;
  padding: 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 18px;
  box-shadow: var(--shadow-sm);
}

.modal__qr img {
  width: 100%;
  border-radius: 10px;
}

.modal__dialog--compact { max-width: 460px; }
.modal__dialog h2 {
  max-width: calc(100% - 36px);
  font-size: 34px;
  line-height: 1.2;
}
.copy-value {
  margin: 20px 0;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface-soft);
  color: var(--primary);
  font-size: 20px;
  font-weight: 800;
  text-align: center;
}
.social-link { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px; color: inherit; font: inherit; text-align: left; cursor: pointer; }
.social-link__platform { font-size: 13px; color: var(--text-muted); }

.toast {
  position: fixed;
  z-index: 3000;
  max-width: min(90vw, 420px);
  padding: 13px 17px;
  color: #fff;
  background: rgba(8,34,81,.94);
  border-radius: 12px;
  box-shadow: 0 18px 50px rgba(0,20,60,.24);
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
  transform: translate(-50%, 16px);
  left: 50%;
  bottom: 24px;
}

.toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.legal-page {
  max-width: 920px;
}

.legal-page h2 {
  margin-top: 50px;
  font-size: 30px;
}

.legal-page h3 {
  margin-top: 32px;
  font-size: 22px;
}

.legal-page p,
.legal-page li {
  color: var(--color-text-secondary);
}

.legal-page code {
  padding: 2px 6px;
  color: var(--color-primary-pressed);
  background: var(--color-primary-container);
  border-radius: 6px;
}

@media (max-width: 1080px) {
  .hero__inner {
    gap: 40px;
    grid-template-columns: 1fr 430px;
  }

  .device--desktop {
    width: 430px;
  }

  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .site-footer__main {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 900px) {
  :root {
    --header-height: 68px;
  }

  .container {
    width: min(calc(100% - 30px), var(--container));
  }

  .section {
    padding: 76px 0;
  }

  .nav {
    position: fixed;
    display: none;
    padding: 12px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 18px;
    box-shadow: var(--shadow-md);
    inset: 76px 15px auto;
  }

  .nav.is-open {
    display: grid;
  }

  .nav__link {
    padding: 14px 16px;
  }

  .header-actions .button {
    display: none;
  }

  .menu-toggle {
    display: grid;
    place-items: center;
  }

  .hero,
  .hero__inner {
    min-height: auto;
  }

  .hero__inner,
  .split,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .hero__copy {
    padding: 72px 0 20px;
  }

  .hero-visual {
    min-height: 480px;
    margin-bottom: 30px;
  }

  .device--desktop {
    width: min(100%, 620px);
  }

  .device--mobile {
    left: 7%;
  }

  .grid--3,
  .service-strip {
    grid-template-columns: 1fr;
  }

  .grid--2,
  .module-grid,
  .screenshot-grid {
    grid-template-columns: 1fr;
  }

  .screenshot-grid .device-mockup--desktop {
    max-width: 100%;
    justify-self: auto;
  }
  .screenshot-grid .device-mockup--mobile {
    max-width: 100%;
  }

  .screenshot-grid .placeholder-media {
    min-height: 310px;
  }

  .qr-box {
    width: 230px;
  }

  .floating-contact {
    display: none;
  }

  .mobile-bar {
    display: flex;
  }

  body {
    padding-bottom: 62px;
  }

  .site-footer__bottom {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 620px) {
  .section {
    padding: 62px 0;
  }

  .section--compact {
    padding: 52px 0;
  }

  h1 {
    font-size: 44px;
  }

  .hero__copy {
    padding-top: 58px;
  }

  .hero__copy .actions,
  .cta-panel .actions {
    display: grid;
  }

  .hero__copy .button,
  .cta-panel .button {
    width: 100%;
  }

  .hero-visual {
    min-height: 400px;
  }

  .device--desktop {
    top: 30px;
  }

  .device--mobile {
    width: 160px;
    bottom: 22px;
  }

  .card,
  .module-card {
    padding: 22px;
  }

  .grid--4,
  .team-grid {
    grid-template-columns: 1fr;
  }

  .team-group__head {
    align-items: flex-start;
    flex-direction: column;
  }

  .advisor-panel {
    text-align: center;
    grid-template-columns: 1fr;
  }

  .advisor-panel__icon {
    margin-inline: auto;
  }

  .cta-panel {
    padding: 34px 24px;
  }

  .contact-layout {
    justify-items: center;
    text-align: center;
  }

  .contact-line {
    justify-content: center;
  }

  .site-footer__main {
    grid-template-columns: 1fr;
  }

  .page-hero {
    padding: 82px 0 64px;
  }

  .timeline::before {
    left: 21px;
  }

  .timeline__item {
    padding-left: 68px;
  }

  .timeline__dot {
    width: 42px;
    height: 42px;
    left: 0;
  }

  .number-list__item {
    align-items: start;
    grid-template-columns: 42px 1fr;
  }

  .number-list__number {
    width: 42px;
    height: 42px;
  }
}

/* ═══ 无头像团队卡片 ═══ */
.person-card {
  position: relative;
  overflow: hidden;
  height: 100%;
  padding: 28px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}
.person-card::before {
  position: absolute;
  height: 5px;
  content: "";
  background: linear-gradient(90deg, var(--color-primary), var(--color-cyan));
  inset: 0 0 auto;
}
.person-top {
  display: flex;
  margin-bottom: 20px;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}
.person-top h3 {
  margin-bottom: 6px;
}
.role {
  margin: 0;
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 850;
}
.tag {
  flex: 0 0 auto;
  padding: 6px 11px;
  color: #087385;
  background: rgba(20,184,207,.09);
  border: 1px solid rgba(20,184,207,.18);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
  white-space: nowrap;
}
.bio {
  padding-left: 1.15em;
  margin: 10px 0 0;
  color: var(--color-text-secondary);
  font-size: 15px;
}
.bio li + li {
  margin-top: 8px;
}

.founder-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.support-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.support-card {
  padding: 28px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}
.support-list {
  display: grid;
  gap: 12px;
  padding: 0;
  margin: 16px 0 0;
  list-style: none;
}
.support-list li {
  display: flex;
  padding: 14px 16px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  background: var(--color-surface-subtle);
  border-radius: 12px;
}
.support-list span:first-child {
  color: var(--color-text-secondary);
}
.support-list strong {
  color: var(--color-primary-pressed);
}

.contact-chip {
  padding: 11px 15px;
  color: #fff;
  background: rgba(255,255,255,.13);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 999px;
  font-weight: 750;
}

.contact-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 24px;
}

/* ═══ 平台感知下载卡片 ═══ */
#download-cards {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.platform-row {
  display: grid;
  gap: 24px;
}

#default-platforms {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

#default-netdisk {
  grid-template-columns: 1fr;
}

#default-netdisk .platform-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 18px;
  align-items: center;
  padding: 20px 24px;
  text-align: left;
}

#default-netdisk .card__icon {
  margin: 0;
}

#default-netdisk .button {
  width: auto;
  min-width: 156px;
  margin-top: 0;
}

.platform-card--recommended {
  position: relative;
  border-color: rgba(20, 136, 247, .7);
  box-shadow: 0 12px 34px rgba(20, 136, 247, .12);
}

.platform-card--recommended::after {
  position: absolute;
  padding: 5px 9px;
  color: #fff;
  background: var(--color-primary);
  border-radius: 0 7px 0 7px;
  content: "当前设备";
  font-size: 12px;
  font-weight: 750;
  right: -1px;
  top: -1px;
}

.platform-card__body h3 {
  margin-bottom: 4px;
}

.platform-card__body p {
  margin: 0;
}

@media (max-width: 900px) {
  .founder-grid,
  .support-grid {
    grid-template-columns: 1fr;
  }
  .person-top {
    flex-direction: column;
  }
  .platform-row {
    grid-template-columns: 1fr !important;
  }
  #default-platforms {
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
  }
}

@media (max-width: 620px) {
  #default-platforms {
    grid-template-columns: 1fr !important;
  }
  #default-netdisk .platform-card {
    grid-template-columns: auto 1fr;
  }
  #default-netdisk .button {
    width: 100%;
    min-width: 0;
    grid-column: 1 / -1;
  }
}

/* ═══ 深色模式背景修复 ═══ */
@media (prefers-color-scheme: dark) {
  .hero {
    background:
      radial-gradient(circle at 12% 15%, rgba(20,184,207,.07), transparent 22%),
      radial-gradient(circle at 85% 20%, rgba(92,174,255,.07), transparent 26%),
      linear-gradient(180deg, #0B1220 0%, #111C2D 78%, #162235 100%);
  }
  .page-hero {
    background:
      radial-gradient(circle at 75% 15%, rgba(20,184,207,.08), transparent 25%),
      linear-gradient(180deg, #0E1728, #111C2D);
  }
  .section--soft {
    background:
      linear-gradient(180deg, rgba(18,54,91,.35), rgba(22,34,53,.98)),
      var(--color-surface-subtle);
  }
  .advisor-panel {
    background:
      radial-gradient(circle at 90% 10%, rgba(20,184,207,.1), transparent 32%),
      linear-gradient(135deg, #162235, #111C2D);
    border-color: var(--color-border);
  }
  .mobile-bar {
    background: rgba(17,28,45,.94);
  }
}

[data-theme="dark"] .hero {
  background:
    radial-gradient(circle at 12% 15%, rgba(20,184,207,.07), transparent 22%),
    radial-gradient(circle at 85% 20%, rgba(92,174,255,.07), transparent 26%),
    linear-gradient(180deg, #0B1220 0%, #111C2D 78%, #162235 100%);
}
[data-theme="dark"] .page-hero {
  background:
    radial-gradient(circle at 75% 15%, rgba(20,184,207,.08), transparent 25%),
    linear-gradient(180deg, #0E1728, #111C2D);
}
[data-theme="dark"] .section--soft {
  background:
    linear-gradient(180deg, rgba(18,54,91,.35), rgba(22,34,53,.98)),
    var(--color-surface-subtle);
}
[data-theme="dark"] .advisor-panel {
  background:
    radial-gradient(circle at 90% 10%, rgba(20,184,207,.1), transparent 32%),
    linear-gradient(135deg, #162235, #111C2D);
  border-color: var(--color-border);
}
[data-theme="dark"] .mobile-bar {
  background: rgba(17,28,45,.94);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: .001ms !important;
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
  }
}

/* ════════════════════════════════════════
   品牌宣传视觉精修 V2
   数学教育语境 · 蓝青识别 · 内容类型分层
   ════════════════════════════════════════ */

::selection {
  color: var(--color-text-primary);
  background: var(--color-primary-container);
}

body {
  background:
    radial-gradient(circle at 8% 8%, rgba(20,136,247,.035), transparent 22%),
    var(--color-background);
}

h1,
h2,
h3 {
  text-wrap: balance;
}

h1 {
  letter-spacing: 0;
}

h2 {
  letter-spacing: 0;
}

.section {
  position: relative;
}

.section__head {
  margin-bottom: 42px;
}

.section__head .lead {
  max-width: 760px;
}

.section__head--center .lead {
  margin-right: auto;
  margin-left: auto;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  letter-spacing: .08em;
}

.eyebrow::before {
  display: inline-block;
  width: 30px;
  height: 3px;
  content: "";
  background: linear-gradient(90deg, var(--color-primary), var(--color-cyan));
  border-radius: 999px;
}

.page-hero {
  isolation: isolate;
  min-height: 390px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid rgba(17,107,229,.09);
}

.page-hero::after,
.hero::after {
  position: absolute;
  z-index: 0;
  top: 42px;
  right: max(4vw, 32px);
  width: min(42vw, 610px);
  height: 260px;
  content: "";
  background:
    radial-gradient(ellipse at 68% 62%, transparent 0 23%, rgba(20,136,247,.12) 23.4% 24%, transparent 24.4%),
    linear-gradient(28deg, transparent 0 47%, rgba(20,136,247,.12) 47.4% 48%, transparent 48.4%),
    linear-gradient(152deg, transparent 0 56%, rgba(20,184,207,.12) 56.4% 57%, transparent 57.4%);
  opacity: .65;
  pointer-events: none;
  transform: rotate(-4deg);
}

.page-hero__inner,
.hero__inner {
  z-index: 2;
}

.page-hero .lead {
  max-width: 760px;
}

.card {
  position: relative;
  overflow: hidden;
  border-color: rgba(75,114,163,.18);
  box-shadow: 0 12px 34px rgba(16,75,145,.075);
}

.card::after {
  position: absolute;
  top: 0;
  right: 24px;
  left: 24px;
  height: 2px;
  content: "";
  background: linear-gradient(90deg, transparent, rgba(20,136,247,.5), rgba(20,184,207,.42), transparent);
  opacity: 0;
  transition: opacity .2s ease;
}

.card:hover::after,
.card--accent::after {
  opacity: 1;
}

.card__meta {
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.card__icon {
  background:
    linear-gradient(145deg, rgba(20,136,247,.12), rgba(20,184,207,.13)),
    var(--color-surface);
  border: 1px solid rgba(20,136,247,.12);
  box-shadow: inset 0 1px rgba(255,255,255,.7);
}

.home-entry .card {
  min-height: 300px;
  display: flex;
  flex-direction: column;
}

.home-entry .card .actions {
  margin-top: auto;
}

.home-values {
  overflow: hidden;
}

.home-values::before,
.section--soft::before {
  position: absolute;
  inset: 0;
  content: "";
  pointer-events: none;
  opacity: .5;
  background-image:
    linear-gradient(rgba(20,136,247,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20,136,247,.035) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(90deg, transparent, #000 18%, #000 82%, transparent);
}

.section--soft > .container {
  position: relative;
  z-index: 1;
}

.home-values .card--accent {
  color: var(--color-text-inverse);
  background:
    radial-gradient(circle at 90% 10%, rgba(99,227,242,.24), transparent 30%),
    linear-gradient(145deg, #0756bd, #1286e9 64%, #14aeca);
  border: 0;
  box-shadow: 0 22px 52px rgba(7,86,189,.22);
}

.home-values .card--accent h3,
.home-values .card--accent .card__meta,
.home-values .card--accent .muted {
  color: #fff;
}

.home-values .card--accent .muted {
  opacity: .85;
}

.home-path .number-list {
  max-width: 940px;
  margin: 0 auto;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.home-path .number-list__item {
  align-items: start;
  padding: 26px;
}

.course-card {
  border-top: 0;
}

.course-card__top {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  min-height: 196px;
  background:
    radial-gradient(circle at 86% 20%, rgba(99,227,242,.32), transparent 28%),
    linear-gradient(145deg, #064aa8, #0874dd 60%, #119cbc);
}

.course-card__top::after {
  position: absolute;
  z-index: -1;
  right: -24px;
  bottom: -32px;
  width: 150px;
  height: 150px;
  content: "";
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 50%;
  box-shadow: 0 0 0 28px rgba(255,255,255,.035), 0 0 0 54px rgba(255,255,255,.025);
  opacity: .8;
  transform: rotate(-10deg);
}

.person-card {
  position: relative;
  overflow: hidden;
  border-color: rgba(75,114,163,.18);
  box-shadow: 0 12px 34px rgba(16,75,145,.07);
}

.person-card::before {
  position: absolute;
  top: 22px;
  bottom: 22px;
  left: 0;
  width: 4px;
  content: "";
  background: linear-gradient(180deg, var(--color-primary), var(--color-cyan));
  border-radius: 0 999px 999px 0;
}

.person-card h3 {
  color: var(--color-primary-pressed);
}

.advisor-panel {
  background:
    radial-gradient(circle at 92% 10%, rgba(20,184,207,.13), transparent 30%),
    linear-gradient(145deg, rgba(20,136,247,.07), rgba(255,255,255,.4)),
    var(--color-surface);
  border-color: rgba(20,136,247,.18);
  box-shadow: 0 18px 48px rgba(16,75,145,.09);
}

.cta-panel {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background:
    radial-gradient(circle at 82% 8%, rgba(115,232,244,.28), transparent 26%),
    radial-gradient(circle at 8% 100%, rgba(38,112,231,.42), transparent 32%),
    linear-gradient(135deg, #073d91, #086fda 58%, #0ca6c3);
  box-shadow: 0 28px 70px rgba(7,70,155,.24);
}

.cta-panel::after {
  position: absolute;
  z-index: -1;
  top: -80px;
  right: -50px;
  width: 340px;
  height: 340px;
  content: "";
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 50%;
  box-shadow: 0 0 0 48px rgba(255,255,255,.035), 0 0 0 96px rgba(255,255,255,.025);
}

.qr-box {
  border: 1px solid rgba(17,107,229,.14);
  box-shadow: 0 14px 36px rgba(4,44,104,.16);
}

.badge {
  background: rgba(255,255,255,.72);
  border-color: rgba(20,136,247,.18);
  box-shadow: 0 6px 18px rgba(16,75,145,.055);
  backdrop-filter: blur(10px);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .advisor-panel,
  :root:not([data-theme]) .badge {
    background: var(--color-surface);
  }

  :root:not([data-theme]) .card__icon {
    box-shadow: none;
  }
}

[data-theme="dark"] .advisor-panel,
[data-theme="dark"] .badge {
  background: var(--color-surface);
}

[data-theme="dark"] .card__icon {
  box-shadow: none;
}

@media (max-width: 900px) {
  .home-path .number-list {
    grid-template-columns: 1fr;
  }

  .page-hero::after,
  .hero::after {
    width: 65vw;
    opacity: .045;
  }
}

/* ═══ 响应式与交互精修 V2 ═══ */

html,
body {
  max-width: 100%;
  overflow-x: clip;
}

.button > svg,
.menu-toggle svg,
.mobile-bar svg,
.floating-contact svg {
  width: 20px;
  height: 20px;
  flex: 0 0 20px;
}

.menu-toggle svg {
  width: 24px;
  height: 24px;
  flex-basis: 24px;
}

.text-link[type="button"] {
  padding: 0;
  cursor: pointer;
  background: transparent;
  text-align: left;
}

@media (max-width: 900px) {
  .site-header__inner {
    gap: 12px;
  }

  .nav {
    max-height: calc(100dvh - var(--header-height) - 28px);
    overflow-y: auto;
    border-radius: 12px;
    inset: calc(var(--header-height) + 8px) 15px auto;
  }

  .nav__link {
    min-height: 48px;
  }

  .hero__inner {
    gap: 8px;
  }

  .hero__copy {
    padding: 58px 0 24px;
  }

  .hero__copy .lead {
    margin-bottom: 24px;
  }

  .hero-visual {
    display: grid;
    min-height: 540px;
    margin-bottom: 10px;
    place-items: start center;
  }

  .hero .hero-visual .device--desktop,
  .hero .hero-visual.device-mode-desktop .device--desktop {
    display: none;
  }

  .hero .hero-visual .device--mobile,
  .hero .hero-visual.device-mode-desktop .device--mobile,
  .hero .hero-visual.device-mode-mobile .device--mobile {
    position: static;
    display: block;
    width: min(68vw, 250px);
    margin: 10px auto 0;
  }

  .hero-visual::before {
    width: min(88vw, 420px);
    height: min(88vw, 420px);
    inset: 20px auto auto 50%;
    transform: translateX(-50%);
  }

  .page-hero {
    min-height: 350px;
  }

  .page-hero__inner {
    max-width: 100%;
  }

  .grid,
  .split,
  .contact-layout,
  .platform-row,
  .site-footer__main {
    min-width: 0;
  }

  .card,
  .person-card,
  .platform-card,
  .timeline__item,
  .number-list__item {
    min-width: 0;
  }

  .modal {
    padding: 14px;
  }

  .modal__dialog {
    max-height: calc(100dvh - 28px);
    overflow-y: auto;
    overscroll-behavior: contain;
  }
}

@media (max-width: 620px) {
  .container {
    width: min(calc(100% - 28px), var(--container));
  }

  h1,
  .page-hero h1 {
    font-size: clamp(38px, 12vw, 48px);
    line-height: 1.13;
  }

  h2 {
    font-size: clamp(28px, 8.5vw, 38px);
    line-height: 1.22;
  }

  .lead {
    font-size: 17px;
  }

  .brand {
    gap: 9px;
  }

  .brand__mark {
    width: 40px;
    height: 40px;
    border-radius: 11px;
  }

  .brand__name {
    font-size: 18px;
  }

  .hero__copy .actions,
  .cta-panel .actions {
    gap: 10px;
  }

  .hero__copy .button,
  .cta-panel .button {
    min-height: 52px;
    white-space: normal;
    text-align: center;
  }

  .hero-visual {
    height: 120px;
    min-height: 120px;
    overflow: hidden;
  }

  .hero .hero-visual .device--mobile,
  .hero .hero-visual.device-mode-desktop .device--mobile,
  .hero .hero-visual.device-mode-mobile .device--mobile {
    width: min(40vw, 140px);
  }

  .hero__copy {
    padding: 28px 0 10px;
  }

  .hero__copy h1 {
    font-size: 40px;
    line-height: 1.12;
  }

  .hero__copy .lead {
    margin-bottom: 18px;
  }

  .modal__dialog h2 {
    font-size: 28px;
  }

  .home-entry .card {
    min-height: auto;
  }

  .section__head {
    margin-bottom: 30px;
  }

  .eyebrow {
    align-items: flex-start;
    font-size: 12px;
    letter-spacing: .045em;
  }

  .eyebrow::before {
    width: 24px;
    margin-top: .65em;
    flex: 0 0 24px;
  }

  .number-list__item {
    gap: 14px;
    padding: 20px 18px;
  }

  .person-card {
    padding: 24px 22px;
  }

  .bio {
    padding-left: 1.05em;
  }

  .cta-panel {
    padding: 32px 20px;
    border-radius: 20px;
  }

  .qr-box,
  .modal__qr {
    width: min(100%, 220px);
  }

  .modal__dialog {
    padding: 28px 20px 22px;
    border-radius: 20px;
  }

  .modal__close {
    top: 10px;
    right: 10px;
  }

  .mobile-bar__link {
    min-width: 0;
    padding: 8px 10px;
    gap: 6px;
    font-size: 14px;
    line-height: 1.25;
    text-align: center;
  }
}

@media (max-width: 360px) {
  .brand__tagline {
    display: none;
  }

  .brand__name {
    font-size: 17px;
  }

  .menu-toggle {
    width: 42px;
    height: 42px;
  }

  .hero__copy {
    padding-top: 46px;
  }

  .hero-visual {
    min-height: 470px;
  }

  .mobile-bar__link {
    font-size: 13px;
  }
}

/* Inner pages follow the denser visual rhythm established on the homepage. */
body:not([data-page="home"]) .page-hero {
  min-height: 320px;
  padding: 84px 0 62px;
}

body:not([data-page="home"]) .page-hero h1 {
  font-size: clamp(42px, 5vw, 58px);
}

body:not([data-page="home"]) .section {
  padding: 76px 0;
}

body:not([data-page="home"]) .section__head {
  margin-bottom: 34px;
}

@media (max-width: 900px) {
  body:not([data-page="home"]) .page-hero {
    min-height: 290px;
    padding: 66px 0 50px;
  }

  body:not([data-page="home"]) .section {
    padding: 68px 0;
  }
}

@media (max-width: 620px) {
  body:not([data-page="home"]) .page-hero {
    min-height: 250px;
    padding: 52px 0 40px;
  }

  body:not([data-page="home"]) .page-hero h1 {
    font-size: clamp(38px, 12vw, 48px);
  }

  body:not([data-page="home"]) .section {
    padding: 56px 0;
  }

  body:not([data-page="home"]) .section__head {
    margin-bottom: 28px;
  }
}