:root {
  color-scheme: light dark;
  --primary: #16a34a;
  --primary-strong: #087f3b;
  --primary-soft: #e3f5e8;
  --cyan: #0891b2;
  --canvas: #f4f7f5;
  --surface: #ffffff;
  --surface-soft: #edf2ef;
  --text: #101714;
  --text-secondary: #65706a;
  --text-tertiary: #929b96;
  --line: #dfe6e2;
  --danger: #dc2626;
  --warning: #d97706;
  --shadow: 0 18px 56px rgba(21, 52, 37, 0.1);
  --shadow-small: 0 8px 24px rgba(21, 52, 37, 0.08);
  --content: 1120px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
}

html[data-theme="dark"] {
  --canvas: #08100c;
  --surface: #111b16;
  --surface-soft: #17241d;
  --text: #f5faf7;
  --text-secondary: #a5b1aa;
  --text-tertiary: #78847d;
  --line: #27372f;
  --primary-soft: #143421;
  --shadow: 0 18px 56px rgba(0, 0, 0, 0.34);
  --shadow-small: 0 8px 24px rgba(0, 0, 0, 0.24);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 92px; }
body {
  min-width: 320px;
  margin: 0;
  overflow-x: hidden;
  background: var(--canvas);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.6;
  letter-spacing: 0;
}

body, button, input { font-family: var(--font); }
button, a { -webkit-tap-highlight-color: transparent; touch-action: manipulation; }
button { color: inherit; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
h1, h2, h3, h4, p { margin-top: 0; }

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--cyan) 72%, white);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 2000;
  padding: 10px 14px;
  border-radius: 12px;
  background: var(--text);
  color: var(--surface);
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 76%, transparent);
  background: color-mix(in srgb, var(--canvas) 88%, transparent);
  -webkit-backdrop-filter: saturate(140%) blur(20px);
  backdrop-filter: saturate(140%) blur(20px);
}

.header-inner {
  width: min(calc(100% - 40px), var(--content));
  min-height: 74px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.brand img {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  box-shadow: 0 8px 18px rgba(8, 145, 178, 0.18);
}
.brand strong { display: block; font-size: 16px; line-height: 1.2; }
.brand-copy > span { display: block; margin-top: 3px; color: var(--text-secondary); font-size: 10px; }

.header-actions { display: flex; align-items: center; gap: 8px; }
.icon-button,
.utility-button {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface);
  color: var(--text-secondary);
  box-shadow: var(--shadow-small);
  cursor: pointer;
}
.icon-button:hover,
.utility-button:hover { color: var(--primary); }

.language-wrap,
.qr-wrap { position: relative; }
.lang-popup,
.qr-popup {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  z-index: 300;
  width: 168px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: var(--shadow);
}
.lang-popup[style*="display: none"] { display: none !important; }
.lang-option {
  width: 100%;
  min-height: 42px;
  padding: 0 12px;
  border: 0;
  border-radius: 11px;
  background: transparent;
  color: var(--text);
  text-align: left;
  cursor: pointer;
}
.lang-option:hover { background: var(--primary-soft); color: var(--primary-strong); }
.qr-popup { width: 172px; padding: 16px; text-align: center; }
.qr-popup p { margin: 10px 0 0; color: var(--text-secondary); font-size: 11px; }
.qr-code { min-height: 128px; display: grid; place-items: center; }
.qr-code img { margin: 0 auto; }
.qr-wrap .qr-popup { display: none; }
.qr-wrap:hover .qr-popup,
.qr-wrap:focus-within .qr-popup { display: block; }

.page-main {
  width: min(calc(100% - 40px), var(--content));
  margin: 0 auto;
  padding: 72px 0 90px;
}

.tool-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(390px, 0.95fr);
  gap: 64px;
  align-items: center;
}

.eyebrow {
  margin-bottom: 13px;
  color: var(--primary);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.title-container { max-width: 680px; }
.title-container h1 {
  max-width: 660px;
  margin-bottom: 18px;
  font-size: clamp(38px, 6vw, 64px);
  line-height: 1.08;
  font-weight: 790;
}
.subtitle {
  max-width: 620px;
  margin-bottom: 0;
  color: var(--text-secondary);
  font-size: 17px;
}
.trust-row {
  margin-top: 34px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.trust-chip {
  min-height: 38px;
  padding: 0 13px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text-secondary);
  font-size: 12px;
}
.trust-chip i { color: var(--primary); }

.profile-card,
.section-card,
.info-card,
.step-card,
.ota-hero-card {
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow-small);
}
.profile-card { padding: 26px; border-radius: 28px; }
.profile-card-head { display: flex; align-items: flex-start; gap: 14px; }
.profile-icon {
  width: 52px;
  height: 52px;
  flex: 0 0 52px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 21px;
}
.profile-card h2,
.ota-hero-card h2 { margin-bottom: 4px; font-size: 20px; }
.profile-card-head p { margin-bottom: 0; color: var(--text-secondary); font-size: 13px; }
.profile-steps { margin: 24px 0; display: grid; gap: 13px; }
.profile-step { display: grid; grid-template-columns: 28px 1fr; gap: 11px; align-items: center; color: var(--text-secondary); font-size: 13px; }
.profile-step span:first-child {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--surface-soft);
  color: var(--primary-strong);
  font-weight: 760;
  font-variant-numeric: tabular-nums;
}

#submitBtn,
.primary-button {
  width: 100%;
  min-height: 54px;
  padding: 0 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border: 1px solid var(--primary);
  border-radius: 17px;
  background: var(--primary);
  color: #fff;
  font-size: 15px;
  font-weight: 760;
  box-shadow: 0 12px 26px rgba(22, 163, 74, 0.22);
  cursor: pointer;
  transition: filter 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}
#submitBtn:hover,
.primary-button:hover { filter: brightness(0.96); box-shadow: 0 16px 32px rgba(22, 163, 74, 0.28); }
#submitBtn:active,
.primary-button:active { transform: scale(0.985); }
.profile-note { margin: 13px 0 0; color: var(--text-tertiary); font-size: 11px; text-align: center; }

.quick-actions {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.action-btn {
  min-height: 72px;
  padding: 12px 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 7px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 650;
  text-align: center;
  box-shadow: var(--shadow-small);
}
.action-btn i { color: var(--primary); font-size: 17px; }
.action-btn:hover { border-color: color-mix(in srgb, var(--primary) 42%, var(--line)); color: var(--primary-strong); }

.result-section,
.content-section { margin-top: 84px; }
.section-heading { margin-bottom: 22px; display: flex; align-items: flex-end; justify-content: space-between; gap: 18px; }
.section-heading h2 { margin-bottom: 0; font-size: 30px; }
.section-heading p { max-width: 520px; margin-bottom: 2px; color: var(--text-secondary); font-size: 13px; text-align: right; }

.device-info { padding: 26px; border-radius: 28px; }
.info-header { margin-bottom: 22px; display: flex; align-items: center; gap: 11px; font-size: 17px; font-weight: 740; }
.info-header i { color: var(--primary); }
.device-fields { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-group { margin: 0; }
.form-group:first-child { grid-column: 1 / -1; }
.form-group label { display: block; margin: 0 0 7px; color: var(--text-secondary); font-size: 11px; font-weight: 650; }
.input-with-copy { position: relative; }
.form-control {
  width: 100%;
  height: 50px;
  padding: 0 48px 0 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface-soft);
  color: var(--text);
  font-size: 13px;
  outline: 0;
}
.form-control:focus { border-color: var(--primary); box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 16%, transparent); }
.copy-icon {
  position: absolute;
  top: 3px;
  right: 3px;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 12px;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
}
.copy-icon:hover { background: var(--primary-soft); color: var(--primary); }

.info-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.info-card { min-height: 190px; padding: 24px; border-radius: 22px; }
.info-card-icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  margin-bottom: 22px;
  border-radius: 14px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 18px;
}
.info-card h3 { margin-bottom: 8px; font-size: 17px; }
.info-card p { margin-bottom: 0; color: var(--text-secondary); font-size: 13px; }

.guide-card { padding: 30px; border-radius: 28px; }
.guide-intro { max-width: 680px; margin-bottom: 30px; color: var(--text-secondary); }
.step-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.step-card { overflow: hidden; border-radius: 22px; }
.step-copy { padding: 22px; }
.step-number { display: block; margin-bottom: 13px; color: var(--primary); font: 700 11px/1 ui-monospace, SFMono-Regular, Menlo, monospace; }
.step-card h3 { margin-bottom: 7px; font-size: 17px; }
.step-card p { margin-bottom: 0; color: var(--text-secondary); font-size: 13px; }
.step-card img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; border-top: 1px solid var(--line); }
.bold-text { color: var(--primary-strong); font-weight: 720; }

.site-footer { padding: 34px 20px 46px; border-top: 1px solid var(--line); color: var(--text-tertiary); font-size: 11px; text-align: center; }
.site-footer a { text-decoration: underline; text-underline-offset: 3px; }

.bubble-container {
  position: fixed;
  right: 18px;
  bottom: 18px;
  left: 18px;
  z-index: 900;
  max-width: 420px;
  margin: 0 auto;
  padding: 17px 50px 17px 18px;
  display: none;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
  color: var(--text-secondary);
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 200ms ease, transform 200ms ease;
}
.bubble-container.show-bubble { display: block; opacity: 1; transform: translateY(0); }
.bubble-content { font-size: 13px; line-height: 1.7; }
.bubble-content img { display: inline; width: 20px; vertical-align: middle; }
.close-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 38px;
  height: 38px;
  border: 0;
  border-radius: 50%;
  background: var(--surface-soft);
  color: var(--text-secondary);
  font-size: 20px;
  cursor: pointer;
}

.toast-message {
  position: fixed;
  top: 50%;
  left: 50%;
  z-index: 1200;
  min-width: 220px;
  max-width: min(90vw, 430px);
  padding: 13px 20px;
  border-radius: 14px;
  background: rgba(6, 17, 12, 0.9);
  color: #fff;
  font-size: 13px;
  line-height: 1.6;
  text-align: center;
  opacity: 0;
  visibility: hidden;
  transform: translate(-50%, calc(-50% + 10px));
  transition: opacity 200ms ease, transform 200ms ease, visibility 200ms ease;
}
.toast-message.show { opacity: 1; visibility: visible; transform: translate(-50%, -50%); }

.video-dialog {
  width: min(calc(100% - 28px), 820px);
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow);
}
.video-dialog::backdrop { background: rgba(3, 10, 7, 0.68); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); }
.video-dialog-head { min-height: 58px; padding: 0 18px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.video-dialog-head strong { font-size: 15px; }
.video-dialog-head button { width: 40px; height: 40px; border: 0; border-radius: 50%; background: var(--surface-soft); cursor: pointer; }
.video-dialog video { width: 100%; background: #000; }

.ota-layout { display: grid; grid-template-columns: minmax(0, 0.88fr) minmax(400px, 1.12fr); gap: 64px; align-items: start; }
.ota-hero-card { padding: 28px; border-radius: 28px; }
.ota-warning { margin: 20px 0; padding: 14px; display: flex; gap: 10px; border-radius: 14px; background: #fff7ed; color: #9a4d08; font-size: 12px; }
html[data-theme="dark"] .ota-warning { background: #3b2817; color: #f4b96e; }
.ota-steps { display: grid; gap: 16px; }
.ota-step { overflow: hidden; border: 1px solid var(--line); border-radius: 22px; background: var(--surface); box-shadow: var(--shadow-small); }
.ota-step-copy { padding: 22px; }
.ota-step-copy h3 { margin-bottom: 7px; font-size: 17px; }
.ota-step-copy p { margin-bottom: 0; color: var(--text-secondary); font-size: 13px; }
.ota-step img { width: 100%; max-height: 420px; object-fit: contain; border-top: 1px solid var(--line); background: var(--surface-soft); }

.pc-only { display: block; }

@media (max-width: 900px) {
  .tool-grid,
  .ota-layout { grid-template-columns: 1fr; gap: 42px; }
  .title-container { max-width: none; }
  .tool-grid .profile-column { max-width: 620px; }
}

@media (max-width: 680px) {
  .header-inner { width: min(calc(100% - 24px), var(--content)); min-height: 66px; }
  .brand img { width: 38px; height: 38px; border-radius: 11px; }
  .brand-copy > span { display: none; }
  .pc-only { display: none !important; }
  .page-main { width: min(calc(100% - 28px), var(--content)); padding: 48px 0 72px; }
  .title-container h1 { font-size: 38px; }
  .subtitle { font-size: 15px; }
  .profile-card { padding: 20px; border-radius: 24px; }
  .quick-actions { gap: 8px; }
  .action-btn { min-height: 68px; padding: 10px 5px; }
  .result-section, .content-section { margin-top: 64px; }
  .section-heading { align-items: flex-start; flex-direction: column; }
  .section-heading h2 { font-size: 26px; }
  .section-heading p { text-align: left; }
  .device-info, .guide-card { padding: 20px; border-radius: 24px; }
  .device-fields, .info-grid, .step-list { grid-template-columns: 1fr; }
  .form-group:first-child { grid-column: auto; }
  .info-card { min-height: 0; }
  .lang-popup { right: -48px; }
}

@media (max-width: 380px) {
  .header-actions { gap: 5px; }
  .icon-button, .utility-button { width: 42px; height: 42px; }
  .title-container h1 { font-size: 34px; }
  .quick-actions { grid-template-columns: 1fr; }
  .action-btn { min-height: 50px; flex-direction: row; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}