@charset "UTF-8";

:root {
  --color-primary: #111111;
  --color-primary-dark: #000000;
  --color-accent: #25D7FF;
  --color-accent-dark: #00B5DB;
  --color-accent-soft: #E6FAFF;
  --color-bg: #FFFFFF;
  --color-bg-soft: #F6F8FA;
  --color-bg-screenshots: #F0F7FA;
  --color-bg-derived: #FAFBFC;
  --color-bg-footer: #0E0F12;
  --color-text: #1A1A1A;
  --color-text-sub: #5A6472;
  --color-text-light: #8A94A2;
  --color-text-on-dark: #FFFFFF;
  --color-text-on-dark-sub: #C4CCD6;
  --color-border: #E6EAF0;
  --color-border-strong: #D2D8E0;
  --radius: 5px;
  --content-max: 1200px;
  --nav-height: 72px;
  --spacing-section: 96px;
  --spacing-section-mobile: 64px;
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

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

a:active,
button:active {
  background-color: transparent;
}

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

.container {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 24px;
}

.icon::before {
  content: "";
  display: block;
  width: 1em;
  height: 1em;
  background: center / contain no-repeat;
}

.icon-globe::before {
  background-image: url("../icons/globe.svg");
}

.icon-arrow-right::before {
  background-image: url("../icons/arrow-right.svg");
}

.icon-chevron-down::before {
  background-image: url("../icons/chevron-down.svg");
}

.icon-menu::before {
  background-image: url("../icons/menu.svg");
}

.icon-close::before {
  background-image: url("../icons/close.svg");
}

.icon-star::before {
  background-image: url("../icons/star.svg");
}

.icon-layers::before {
  background-image: url("../icons/layers.svg");
}

.icon-zap::before {
  background-image: url("../icons/zap.svg");
}

.icon-info::before {
  background-image: url("../icons/info.svg");
}

.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1em;
  width: 1em;
  height: 1em;
  line-height: 1;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius);
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-on-dark);
  border-color: var(--color-primary);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #001A20;
  outline: none;
}

.btn-large {
  padding: 14px 32px;
  font-size: 16px;
}

.btn-download {
  min-width: 160px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--color-text);
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  object-fit: cover;
}

.brand-name {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.main-nav {
  display: flex;
  align-items: center;
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  border-radius: var(--radius);
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  padding: 0;
  cursor: pointer;
  font-size: 20px;
}

.nav-download {
  display: none;
  padding: 8px 14px;
  font-size: 13px;
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent-dark);
  outline: none;
}

.nav-menu {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
}

.nav-menu a {
  display: inline-block;
  padding: 8px 14px;
  font-size: 14px;
  color: var(--color-text-sub);
  text-decoration: none;
  border-radius: var(--radius);
  transition: color 0.2s ease, background-color 0.2s ease;
  font-weight: 500;
}

.nav-menu a:hover,
.nav-menu a:focus-visible {
  color: var(--color-text);
  background: var(--color-bg-soft);
  outline: none;
}

.header-download {
  padding: 9px 18px;
  font-size: 14px;
}

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

.section + .section {
  border-top: 1px solid transparent;
}

.section-head {
  text-align: center;
  margin-bottom: 56px;
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  margin: 0 0 12px 0;
  color: var(--color-text);
  letter-spacing: 0.2px;
}

.section-subtitle {
  font-size: 15px;
  color: var(--color-text-sub);
  margin: 0;
}

.hero {
  padding-top: 72px;
  padding-bottom: var(--spacing-section);
  background: linear-gradient(180deg, #F8FCFF 0%, #FFFFFF 60%);
  border-bottom: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -120px;
  right: -120px;
  width: 480px;
  height: 480px;
  background: radial-gradient(circle, rgba(37, 215, 255, 0.12) 0%, rgba(37, 215, 255, 0) 70%);
  border-radius: 50%;
  z-index: 0;
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
}

.hero-left {
  padding: 12px 0;
}

.hero-title {
  font-size: 52px;
  font-weight: 800;
  margin: 0 0 12px 0;
  line-height: 1.1;
  color: var(--color-text);
  letter-spacing: 0.3px;
}

.hero-title::after {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-left: 6px;
  background: var(--color-accent);
  border-radius: 2px;
  transform: translateY(-6px);
}

.hero-subtitle {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 16px 0;
  color: var(--color-primary);
  white-space: nowrap;
  overflow: hidden;
}

.hero-desc {
  font-size: 15px;
  color: var(--color-text-sub);
  margin: 0 0 32px 0;
  max-width: 440px;
  line-height: 1.75;
}

.hero-updated {
  display: block;
  margin-top: 16px;
  font-size: 12px;
  color: var(--color-text-light);
}

.hero-right {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  min-height: 520px;
  position: relative;
}

.chat-panel {
  position: relative;
  width: 340px;
  background: #FFFFFF;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  box-shadow: 0 40px 80px -20px rgba(17, 17, 17, 0.28), 0 10px 30px -10px rgba(17, 17, 17, 0.18);
}

.chat-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background: var(--color-primary);
  color: var(--color-text-on-dark);
  border-radius: var(--radius) var(--radius) 0 0;
}

.chat-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
  color: #001A20;
  font-size: 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.chat-user {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.chat-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text-on-dark);
}

.chat-status {
  font-size: 12px;
  color: #9BE8FF;
}

.chat-body {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px;
  background: #F8FAFC;
  min-height: 300px;
}

.chat-msg {
  display: flex;
}

.chat-msg-other {
  justify-content: flex-start;
}

.chat-msg-self {
  justify-content: flex-end;
}

.chat-bubble {
  max-width: 76%;
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
  border-radius: var(--radius);
  word-break: break-word;
}

.chat-msg-other .chat-bubble {
  background: #FFFFFF;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-top-left-radius: 2px;
}

.chat-msg-self .chat-bubble {
  background: var(--color-accent);
  color: #001A20;
  border-top-right-radius: 2px;
}

.chat-input {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 20px;
  background: #FFFFFF;
  border-top: 1px solid var(--color-border);
  border-radius: 0 0 var(--radius) var(--radius);
}

.chat-input-hint {
  font-size: 13px;
  color: var(--color-text-light);
}

.chat-send {
  font-size: 18px;
  color: var(--color-accent-dark);
}

.overlay-card {
  position: absolute;
  left: -150px;
  bottom: 64px;
  width: 210px;
  background: #FFFFFF;
  border-radius: var(--radius);
  padding: 14px 16px;
  box-shadow: 0 20px 40px -10px rgba(17, 17, 17, 0.24);
  border: 1px solid var(--color-border);
  z-index: 3;
}

.overlay-card-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.overlay-icon {
  font-size: 16px;
  color: var(--color-accent-dark);
}

.overlay-card-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-text);
}

.overlay-card-body {
  font-size: 13px;
  color: var(--color-text-sub);
  margin: 0 0 10px 0;
  line-height: 1.5;
}

.overlay-card-footer {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.overlay-tag {
  font-size: 11px;
  padding: 3px 8px;
  border-radius: var(--radius);
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
  font-weight: 600;
}

.features {
  background: var(--color-bg);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.feature-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
  box-shadow: 0 20px 40px -20px rgba(37, 215, 255, 0.3);
}

.feature-icon-wrap {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.icon-accent-1 {
  background: #E6FAFF;
  color: #008FB0;
}

.icon-accent-2 {
  background: #EDE9FF;
  color: #5A4DB8;
}

.icon-accent-3 {
  background: #FFF3E0;
  color: #C07618;
}

.icon-accent-4 {
  background: #E4F6E8;
  color: #2E8B4D;
}

.feature-icon {
  font-size: 24px;
}

.feature-title {
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 10px 0;
  color: var(--color-text);
}

.feature-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-sub);
  margin: 0;
}

.screenshots {
  background: var(--color-bg-screenshots);
}

.screenshots-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  justify-content: center;
}

.screenshot-card {
  margin: 0;
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  display: flex;
  flex-direction: column;
}

.screenshot-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px -20px rgba(17, 17, 17, 0.18);
}

.screenshot-img-wrap {
  background: #F2F4F7;
  padding: 12px;
}

.screenshot-img {
  width: 100%;
  height: auto;
  aspect-ratio: 549 / 976;
  object-fit: cover;
  border-radius: var(--radius);
  display: block;
}

.screenshot-caption {
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: #FFFFFF;
}

.screenshot-index {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-accent-dark);
  letter-spacing: 0.5px;
}

.screenshot-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text);
}

.screenshot-tip {
  font-size: 12px;
  color: var(--color-text-light);
}

.derived {
  background: var(--color-bg-derived);
}

.derived-inner {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
  align-items: center;
}

.derived-preview-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 24px 60px -24px rgba(17, 17, 17, 0.16);
}

.derived-preview-header {
  padding: 16px 20px;
  background: var(--color-primary);
  color: var(--color-text-on-dark);
}

.derived-preview-label {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.3px;
}

.derived-preview-body {
  padding: 20px;
  background: #F8FAFC;
  border-bottom: 1px solid var(--color-border);
}

.derived-prompt {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-sub);
  font-style: italic;
  padding-left: 16px;
  border-left: 3px solid var(--color-accent);
}

.derived-preview-result {
  padding: 16px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.derived-result-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.derived-result-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-sub);
  flex-shrink: 0;
}

.derived-result-value {
  font-size: 14px;
  color: var(--color-text);
  font-weight: 600;
}

.derived-palette {
  display: flex;
  gap: 6px;
}

.palette-dot {
  width: 22px;
  height: 22px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.derived-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.derived-item {
  display: flex;
  gap: 20px;
  padding: 20px;
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.derived-item:hover {
  border-color: var(--color-accent);
  transform: translateX(4px);
}

.derived-item-num {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
  font-weight: 800;
  font-size: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.derived-item-title {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 6px 0;
  color: var(--color-text);
}

.derived-item-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-sub);
  margin: 0;
}

.faq {
  background: var(--color-bg);
}

.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-item.is-open {
  border-color: var(--color-accent);
  box-shadow: 0 10px 24px -16px rgba(37, 215, 255, 0.4);
}

.faq-question {
  width: 100%;
  background: transparent;
  border: 0;
  padding: 18px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
  text-align: left;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
}

.faq-question:hover,
.faq-question:focus-visible {
  background: var(--color-bg-soft);
  outline: none;
}

.faq-question-text {
  flex: 1;
}

.faq-icon {
  font-size: 16px;
  color: var(--color-text-light);
  flex-shrink: 0;
  transition: transform 0.25s ease, color 0.25s ease;
}

.faq-item.is-open .faq-icon {
  transform: rotate(180deg);
  color: var(--color-accent-dark);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-item.is-open .faq-answer {
  max-height: 400px;
}

.faq-answer p {
  margin: 0;
  padding: 0 22px 20px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-sub);
}

.official {
  padding-top: 0;
  padding-bottom: var(--spacing-section);
}

.official-entry {
  width: 100%;
  background: #FFFFFF;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius);
  padding: 18px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.official-entry:hover,
.official-entry:focus-visible {
  border-color: var(--color-accent);
  background: #FCFEFF;
  outline: none;
}

.official-entry-left {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
}

.official-icon {
  font-size: 20px;
  color: var(--color-accent-dark);
}

.official-arrow {
  font-size: 16px;
  color: var(--color-text-light);
  transition: transform 0.25s ease;
}

.official-entry[aria-expanded="true"] .official-arrow {
  transform: rotate(180deg);
  color: var(--color-accent-dark);
}

.official-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  margin-top: 0;
}

.official-content.is-open {
  max-height: 100px;
  margin-top: 12px;
}

.official-link {
  display: inline-block;
  padding: 12px 20px;
  background: var(--color-bg-soft);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--color-accent-dark);
  text-decoration: none;
  font-weight: 600;
  border: 1px dashed var(--color-border-strong);
  word-break: break-all;
}

.official-link:hover,
.official-link:focus-visible {
  background: var(--color-accent-soft);
  border-color: var(--color-accent);
  outline: none;
}

.reviews {
  background: var(--color-bg-soft);
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.review-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
  box-shadow: 0 20px 40px -20px rgba(37, 215, 255, 0.24);
}

.review-meta {
  display: flex;
  align-items: center;
  gap: 14px;
}

.review-index {
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  background: var(--color-primary);
  color: var(--color-text-on-dark);
  font-weight: 700;
  font-size: 13px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.review-user {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.review-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text);
}

.review-time {
  font-size: 12px;
  color: var(--color-text-light);
}

.review-body {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--color-text-sub);
}

.download {
  background: linear-gradient(135deg, #0E0F12 0%, #1B1F26 100%);
  color: var(--color-text-on-dark);
  padding: var(--spacing-section) 0;
}

.download-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.download-title {
  font-size: 30px;
  font-weight: 700;
  margin: 0 0 8px 0;
  color: var(--color-text-on-dark);
}

.download-desc {
  font-size: 15px;
  margin: 0;
  color: var(--color-text-on-dark-sub);
}

.download-right {
  display: flex;
  justify-content: flex-end;
}

.btn-download {
  background: var(--color-accent);
  color: #001A20;
  border-color: var(--color-accent);
  padding: 16px 40px;
  font-size: 16px;
}

.btn-download:hover,
.btn-download:focus-visible {
  background: #FFFFFF;
  border-color: #FFFFFF;
  color: var(--color-primary);
  outline: none;
}

.site-footer {
  background: var(--color-bg-footer);
  color: var(--color-text-on-dark-sub);
  padding: 64px 0 32px;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 48px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
  text-align: center;
}

.footer-logo {
  width: 42px;
  height: 42px;
  border-radius: var(--radius);
  object-fit: cover;
}

.footer-brand-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text-on-dark);
}

.footer-brand-desc {
  font-size: 13px;
  color: var(--color-text-on-dark-sub);
  margin: 0;
}

.footer-navs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.footer-nav-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text-on-dark);
  margin: 0 0 16px 0;
  text-align: center;
}

.footer-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
}

.footer-nav a {
  text-decoration: none;
  color: var(--color-text-on-dark-sub);
  font-size: 13px;
  transition: color 0.2s ease;
}

.footer-nav a:hover,
.footer-nav a:focus-visible {
  color: var(--color-accent);
  outline: none;
}

.footer-copy {
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  text-align: center;
}

.footer-copy p {
  margin: 0;
  font-size: 12px;
  color: var(--color-text-light);
}

@media (max-width: 1024px) {
  :root {
    --spacing-section: 72px;
  }

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

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

  .derived-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

  .hero-title {
    font-size: 42px;
  }
}

@media (max-width: 860px) {
  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: #FFFFFF;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    transform: translateZ(0);
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    will-change: transform;
  }

  main {
    padding-top: var(--nav-height);
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-download {
    display: inline-flex;
  }

  .header-download {
    display: none;
  }

  .main-nav {
    order: 3;
    gap: 10px;
  }

  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: #FFFFFF;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    padding: 12px 0;
    transform: translateY(-120%);
    transition: transform 0.3s ease;
    box-shadow: 0 20px 40px -24px rgba(17, 17, 17, 0.2);
  }

  .nav-menu.is-open {
    transform: translateY(0);
  }

  .nav-menu li {
    width: 100%;
  }

  .nav-menu a {
    display: block;
    padding: 14px 24px;
    border-radius: 0;
    font-size: 15px;
  }

  .hero {
    padding-top: 32px;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-right {
    justify-content: center;
    min-height: auto;
    padding-right: 0;
  }

  .chat-panel {
    width: 340px;
    max-width: 100%;
  }

  .overlay-card {
    display: none;
  }

  .download-inner {
    grid-template-columns: 1fr;
    gap: 24px;
    text-align: center;
  }

  .download-right {
    justify-content: center;
  }
}

@media (max-width: 640px) {
  :root {
    --spacing-section: var(--spacing-section-mobile);
    --nav-height: 64px;
  }

  .container {
    padding: 0 18px;
  }

  .section-head {
    margin-bottom: 36px;
  }

  .section-title {
    font-size: 24px;
  }

  .section-subtitle {
    font-size: 14px;
  }

  .hero-title {
    font-size: 32px;
  }

  .hero-subtitle {
    font-size: 15px;
  }

  .hero-desc {
    font-size: 14px;
    margin-bottom: 24px;
  }

  .btn-large {
    padding: 12px 26px;
    font-size: 15px;
    width: auto;
  }

  .hero-right {
    overflow: hidden;
  }

  .chat-panel {
    width: 100%;
  }

  .overlay-card {
    display: none;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .feature-card {
    padding: 22px 18px;
  }

  .screenshots-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .screenshot-img-wrap {
    padding: 8px;
  }

  .screenshot-caption {
    padding: 12px;
    gap: 2px;
  }

  .screenshot-name {
    font-size: 13px;
  }

  .screenshot-tip {
    font-size: 11px;
  }

  .derived-inner {
    gap: 28px;
  }

  .derived-item {
    padding: 16px;
    gap: 14px;
  }

  .derived-item-num {
    width: 38px;
    height: 38px;
    font-size: 14px;
  }

  .faq-list {
    gap: 10px;
  }

  .faq-question {
    padding: 16px 18px;
    font-size: 14px;
  }

  .faq-answer p {
    padding: 0 18px 18px;
    font-size: 13px;
  }

  .official-entry {
    padding: 16px 18px;
  }

  .official-entry-left {
    font-size: 14px;
  }

  .reviews-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .review-card {
    padding: 20px 18px;
  }

  .footer-inner {
    gap: 32px;
  }

  .footer-brand {
    align-items: center;
    text-align: center;
  }

  .footer-navs {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    text-align: center;
  }

  .footer-nav ul {
    align-items: center;
  }

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

@media (max-width: 430px) {
  .hero-title {
    font-size: 28px;
  }
}

@media (max-width: 375px) {
  .hero-title {
    font-size: 26px;
  }
}

@media (max-width: 320px) {
  .container {
    padding: 0 14px;
  }

  .hero-title {
    font-size: 24px;
  }

  .brand-name {
    font-size: 16px;
  }
}