:root {
  --bg: #f6f7fb;
  --surface: #fbfbfe;
  --surface-soft: #ffffff;
  --line: #e2e6ef;
  --line-strong: #d7ddea;
  --text: #16181d;
  --text-soft: #6e7485;
  --accent: #5955e8;
  --accent-soft: rgba(89, 85, 232, 0.08);
  --accent-pressed: #4743d0;
  --shadow: 0 18px 44px rgba(26, 32, 44, 0.06);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 16px;
  --radius-sm: 12px;
}

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

html {
  color-scheme: light;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "SF Pro Display", "PingFang SC", "Helvetica Neue", sans-serif;
  color: var(--text);
  background: var(--bg);
}

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

button {
  font: inherit;
}

p,
h1,
h2,
h3 {
  margin: 0;
}

.app-shell {
  min-height: 100vh;
}

.mobile-frame {
  width: min(100%, 430px);
  min-height: 100vh;
  margin: 0 auto;
  padding: max(18px, env(safe-area-inset-top)) 20px 34px;
  background: var(--surface);
}

.screen {
  display: none;
}

.screen.is-active {
  display: block;
}

.mobile-topbar {
  display: grid;
  grid-template-columns: 44px 1fr 44px;
  align-items: center;
  min-height: 44px;
  gap: 8px;
}

.mobile-topbar--intro {
  grid-template-columns: 44px 1fr 44px;
}

.topbar-title {
  text-align: center;
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.3;
}

.topbar-dots,
.topbar-spacer,
.progress-fraction {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-width: 44px;
  color: var(--text-soft);
  font-size: 0.95rem;
}

.icon-button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--text);
  font-size: 1.2rem;
  cursor: pointer;
}

.icon-button:disabled {
  color: #c4c9d8;
  cursor: default;
}

.intro-card,
.question-panel,
.result-card {
  margin-top: 24px;
}

.intro-card {
  display: grid;
  gap: 20px;
  padding: 30px 0 12px;
}

.intro-kicker,
.question-description,
.subject-meta,
.result-tag,
.result-block p {
  color: var(--text-soft);
  line-height: 1.7;
}

.intro-kicker,
.result-tag {
  font-size: 0.9rem;
  font-weight: 600;
}

.intro-card h1 {
  font-size: clamp(2.15rem, 8vw, 2.9rem);
  line-height: 1.14;
  letter-spacing: -0.03em;
}

.intro-copy {
  color: var(--text-soft);
  font-size: 1rem;
  line-height: 1.8;
  max-width: 24rem;
}

.intro-note {
  color: var(--text-soft);
  font-size: 0.94rem;
}

.subject-preview {
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 14px;
  align-items: center;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.72);
}

.subject-preview img,
.subject-chip img {
  object-fit: cover;
}

.subject-preview img {
  aspect-ratio: 1;
  border-radius: var(--radius-md);
}

.subject-name {
  font-size: 1rem;
  font-weight: 700;
}

.subject-meta {
  margin-top: 4px;
  font-size: 0.92rem;
}

.progress-wrap {
  margin-top: 20px;
}

.progress-track {
  height: 4px;
  overflow: hidden;
  border-radius: 999px;
  background: #eceef6;
}

.progress-fill {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width 220ms ease;
}

.question-panel {
  display: grid;
  gap: 18px;
  padding-top: 26px;
}

.subject-chip {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  width: fit-content;
  padding: 6px 10px 6px 6px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.82);
  color: var(--text-soft);
  font-size: 0.84rem;
}

.subject-chip img {
  width: 28px;
  height: 28px;
  border-radius: 999px;
}

.question-panel h2 {
  font-size: clamp(2rem, 8vw, 2.7rem);
  line-height: 1.28;
  letter-spacing: -0.04em;
  font-weight: 800;
}

.question-description {
  max-width: 24rem;
  font-size: 0.96rem;
}

.option-list {
  display: grid;
  gap: 14px;
  margin-top: clamp(42px, 8vh, 88px);
}

.option-button {
  width: 100%;
  min-height: 88px;
  padding: 24px 20px;
  border: 1.5px solid var(--line);
  border-radius: 24px;
  background: #ffffff;
  color: var(--text);
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.5;
  text-align: center;
  box-shadow: none;
  cursor: pointer;
  transition:
    border-color 180ms ease,
    background-color 180ms ease,
    box-shadow 180ms ease;
}

.option-button:hover {
  border-color: var(--line-strong);
}

.option-button.is-selected {
  border-color: var(--accent);
  background: #ffffff;
  box-shadow: inset 0 0 0 2px rgba(89, 85, 232, 0.12);
}

.option-button:focus-visible,
.primary-button:focus-visible,
.text-button:focus-visible,
.icon-button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.question-footer {
  display: grid;
  gap: 18px;
  margin-top: 38px;
  padding-bottom: calc(8px + env(safe-area-inset-bottom));
}

.primary-button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 50px;
  padding: 0 18px;
  border: 0;
  border-radius: 14px;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition:
    background-color 180ms ease,
    transform 180ms ease,
    opacity 180ms ease;
}

.primary-button:hover {
  background: var(--accent-pressed);
}

.next-button {
  min-height: 44px;
  padding: 0;
  border-radius: 0;
  background: transparent;
  color: var(--text);
  font-size: 1.05rem;
}

.next-button:hover {
  background: transparent;
  color: var(--text);
}

.primary-button:disabled {
  background: #d8dbe6;
  color: #ffffff;
  cursor: default;
  transform: none;
}

.next-button:disabled {
  background: transparent;
  color: #d4d8e3;
}

.primary-button--full {
  width: 100%;
}

.text-button {
  border: 0;
  background: transparent;
  color: var(--text-soft);
  font-size: 0.98rem;
  font-weight: 600;
  cursor: pointer;
  justify-self: center;
}

.text-button:disabled {
  color: #c8ccda;
  cursor: default;
}

.result-card {
  display: grid;
  gap: 18px;
  padding: 30px 0 34px;
}

.result-card h2 {
  font-size: clamp(2rem, 8vw, 2.7rem);
  line-height: 1.18;
  letter-spacing: -0.04em;
}

.result-verdict {
  color: var(--text);
  font-size: 1rem;
  line-height: 1.8;
}

.result-photo {
  overflow: hidden;
  border-radius: 24px;
  background: var(--surface-soft);
}

.result-photo img {
  aspect-ratio: 1 / 1.08;
  object-fit: cover;
  object-position: center top;
}

.result-block {
  display: grid;
  gap: 8px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #ffffff;
}

.result-block h3 {
  font-size: 0.96rem;
  font-weight: 700;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (min-width: 431px) {
  body {
    padding: 18px;
  }

  .mobile-frame {
    min-height: calc(100vh - 36px);
    border: 1px solid var(--line);
    border-radius: 28px;
    box-shadow: var(--shadow);
  }
}