:root {
  color-scheme: light dark;
  --font-ui: "SF Pro Display", "SF Pro Text", "Segoe UI Variable", "Segoe UI", system-ui, sans-serif;
  --bg-top: #f8fbff;
  --bg-bottom: #e7eefb;
  --surface: rgba(255, 255, 255, 0.9);
  --surface-strong: rgba(255, 255, 255, 0.96);
  --surface-soft: rgba(255, 255, 255, 0.7);
  --border: rgba(108, 136, 185, 0.16);
  --text: #12213d;
  --muted: #5e6e89;
  --accent: #0d63f3;
  --accent-strong: #0a4ec1;
  --accent-contrast: #ffffff;
  --success-bg: #e7f7ee;
  --success-text: #176d43;
  --warn-bg: #fff0df;
  --warn-text: #9b4e00;
  --shadow: 0 18px 40px rgba(81, 103, 142, 0.16);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 18px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-top: #0c1526;
    --bg-bottom: #101b31;
    --surface: rgba(20, 29, 47, 0.9);
    --surface-strong: rgba(21, 31, 50, 0.96);
    --surface-soft: rgba(28, 40, 65, 0.72);
    --border: rgba(181, 202, 240, 0.12);
    --text: #f4f7ff;
    --muted: #afbbd1;
    --accent: #5da2ff;
    --accent-strong: #7ab4ff;
    --success-bg: rgba(35, 116, 75, 0.25);
    --success-text: #8ee0b6;
    --warn-bg: rgba(127, 76, 24, 0.28);
    --warn-text: #ffc98f;
    --shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
  }
}

* {
  box-sizing: border-box;
  min-width: 0;
}

[hidden] {
  display: none !important;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  font-family: var(--font-ui);
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(80, 147, 255, 0.2), transparent 28%),
    radial-gradient(circle at bottom right, rgba(255, 188, 137, 0.16), transparent 24%),
    linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
  overflow-x: hidden;
}

body.dialog-open {
  overflow: hidden;
}

body.dialog-open .app-shell {
  pointer-events: none;
  user-select: none;
}

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

a {
  color: inherit;
}

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

.app-shell {
  width: min(100%, 760px);
  margin: 0 auto;
  padding:
    max(16px, env(safe-area-inset-top))
    16px
    max(28px, env(safe-area-inset-bottom))
    16px;
  display: grid;
  gap: 14px;
}

.hero-panel,
.step-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px) saturate(135%);
  -webkit-backdrop-filter: blur(18px) saturate(135%);
}

.hero-panel {
  padding: 18px;
}

.hero-top {
  display: flex;
  align-items: center;
  gap: 14px;
}

.app-icon-wrap {
  width: 76px;
  height: 76px;
  padding: 6px;
  flex-shrink: 0;
  border-radius: 22px;
  background: var(--surface-strong);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

.app-icon {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 18px;
}

.hero-copy {
  display: grid;
  gap: 4px;
}

.eyebrow {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-strong);
}

.hero-panel h1,
.step-card h2 {
  margin: 0;
  letter-spacing: -0.04em;
  overflow-wrap: anywhere;
}

.hero-panel h1 {
  font-size: clamp(1.8rem, 7vw, 2.3rem);
  line-height: 1.02;
}

.hero-subtitle,
.step-copy,
.inline-note,
.text-link,
.detail-value,
.detail-value a {
  overflow-wrap: anywhere;
}

.hero-subtitle,
.step-copy,
.inline-note {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.badge,
.step-tag,
.status-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.badge {
  background: var(--surface-soft);
  color: var(--text);
  border: 1px solid var(--border);
}

.step-card {
  padding: 18px;
  display: grid;
  gap: 14px;
}

.step-card-primary {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(240, 246, 255, 0.94));
}

.step-card-warn {
  background: linear-gradient(180deg, rgba(255, 247, 236, 0.98), rgba(255, 240, 219, 0.95));
}

@media (prefers-color-scheme: dark) {
  .step-card-primary {
    background: linear-gradient(180deg, rgba(23, 35, 57, 0.96), rgba(18, 29, 48, 0.94));
  }

  .step-card-warn {
    background: linear-gradient(180deg, rgba(48, 34, 19, 0.96), rgba(42, 30, 18, 0.94));
  }
}

.step-head {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: space-between;
  align-items: center;
}

.step-tag {
  background: rgba(13, 99, 243, 0.1);
  color: var(--accent-strong);
}

.status-chip {
  background: rgba(13, 99, 243, 0.14);
  color: var(--accent-strong);
}

.status-chip-success {
  background: var(--success-bg);
  color: var(--success-text);
}

.status-chip-warn {
  background: var(--warn-bg);
  color: var(--warn-text);
}

.step-card h2 {
  font-size: clamp(1.3rem, 5vw, 1.75rem);
  line-height: 1.1;
}

.btn {
  appearance: none;
  border: none;
  width: 100%;
  min-height: 52px;
  padding: 14px 18px;
  border-radius: 18px;
  font: inherit;
  font-size: 1rem;
  font-weight: 800;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: transform 160ms ease, opacity 160ms ease, box-shadow 160ms ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn:disabled {
  opacity: 0.5;
  pointer-events: none;
}

.btn-primary {
  background: linear-gradient(180deg, #2d8cff 0%, var(--accent) 100%);
  color: var(--accent-contrast);
  box-shadow: 0 10px 24px rgba(13, 99, 243, 0.28);
}

.btn-secondary {
  background: rgba(15, 30, 60, 0.08);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-warn {
  background: linear-gradient(180deg, #ff9d34 0%, #f68012 100%);
  color: #ffffff;
  box-shadow: 0 10px 24px rgba(246, 128, 18, 0.28);
}

.inline-note {
  font-size: 0.92rem;
}

#hostNotice {
  display: none;
}

#hostNotice.is-visible {
  display: block;
}

.certificate-notice {
  display: none;
}

.certificate-notice.is-visible {
  display: block;
  background: var(--warn-bg);
  color: var(--warn-text);
  padding: 10px 14px;
  border-radius: 12px;
  font-weight: 600;
}

.guide-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface-strong);
  border: 1px solid var(--border);
}

.guide-image {
  width: 100%;
  height: auto;
  object-fit: contain;
}

.detail-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

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

.detail-item {
  padding: 12px 13px;
  border-radius: var(--radius-md);
  background: var(--surface-soft);
  border: 1px solid var(--border);
  display: grid;
  gap: 6px;
}

.detail-label {
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.detail-value {
  font-size: 0.98rem;
  line-height: 1.4;
}

.detail-value a,
.text-link {
  color: var(--accent-strong);
  font-weight: 700;
  text-decoration: none;
}

.detail-value a:hover,
.text-link:hover {
  text-decoration: underline;
}

.dialog-backdrop {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 16px;
  background: rgba(10, 20, 38, 0.42);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.dialog-backdrop[hidden] {
  display: none;
}

.dialog-panel {
  width: min(100%, 420px);
  padding: 20px;
  border-radius: 28px;
  border: 1px solid var(--border);
  background: var(--surface-strong);
  box-shadow: 0 24px 56px rgba(10, 20, 38, 0.24);
  display: grid;
  gap: 16px;
}

.dialog-icon {
  width: 52px;
  height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 18px;
  background: rgba(13, 99, 243, 0.12);
  color: var(--accent-strong);
}

.dialog-icon-core {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 7px rgba(13, 99, 243, 0.12);
}

.dialog-panel[data-tone="warn"] .dialog-icon {
  background: var(--warn-bg);
  color: var(--warn-text);
}

.dialog-panel[data-tone="warn"] .dialog-icon-core {
  box-shadow: 0 0 0 7px rgba(246, 128, 18, 0.14);
}

.dialog-copy {
  display: grid;
  gap: 8px;
}

.dialog-eyebrow {
  margin: 0;
  color: var(--accent-strong);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.dialog-panel[data-tone="warn"] .dialog-eyebrow {
  color: var(--warn-text);
}

.dialog-title {
  margin: 0;
  font-size: clamp(1.25rem, 5vw, 1.6rem);
  line-height: 1.1;
  letter-spacing: -0.04em;
  overflow-wrap: anywhere;
}

.dialog-message,
.dialog-list {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.dialog-list {
  padding-left: 20px;
  display: grid;
  gap: 8px;
}

.dialog-list[hidden] {
  display: none;
}

.dialog-confirm {
  margin-top: 4px;
}

@media (max-width: 560px) {
  .app-shell {
    padding-left: 12px;
    padding-right: 12px;
    gap: 12px;
  }

  .hero-panel,
  .step-card {
    padding: 16px;
    border-radius: 24px;
  }

  .hero-top {
    align-items: flex-start;
  }

  .app-icon-wrap {
    width: 68px;
    height: 68px;
    border-radius: 20px;
  }

  .detail-list,
  .detail-list-compact {
    grid-template-columns: 1fr;
  }

  .dialog-backdrop {
    padding: 12px;
  }

  .dialog-panel {
    padding: 18px;
    border-radius: 24px;
  }
}

@media (min-width: 640px) {
  .dialog-backdrop {
    align-items: center;
  }
}