.form-error {
  margin: 10px 0 0;
  color: var(--error, #ef6a72);
  font-size: 13px;
  text-align: left;
}

.auth-dialog {
  width: min(100% - 32px, 480px);
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text-primary);
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.58);
}

.auth-dialog::backdrop {
  background: rgba(2, 3, 5, 0.82);
}

.auth-dialog__panel {
  position: relative;
  padding: 32px;
}

.auth-dialog h2 {
  margin: 12px 0;
  font-size: clamp(1.8rem, 7vw, 2.4rem);
  letter-spacing: -0.04em;
}

.auth-dialog__close {
  position: absolute;
  top: 14px;
  right: 14px;
}

.icon-button {
  width: 36px;
  height: 36px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  background: transparent;
  color: var(--text-secondary);
  font-size: 1.5rem;
  line-height: 1;
}

.showcase-section {
  overflow: hidden;
}

.landing-stats {
  display: flex;
  gap: 10px;
  margin: 24px 0 30px;
}

.landing-stats > div {
  min-width: 140px;
  padding: 14px 16px;
  border: 1px solid color-mix(in srgb, var(--accent) 28%, var(--border));
  border-radius: 12px;
  background: color-mix(in srgb, var(--surface) 88%, var(--accent));
}

.landing-stats strong,
.landing-stats span {
  display: block;
}

.landing-stats strong {
  color: var(--text-primary);
  font-size: clamp(1.45rem, 3vw, 2.2rem);
  letter-spacing: -0.06em;
}

.landing-stats span {
  margin-top: 3px;
  color: var(--text-secondary);
  font-size: 12px;
}

@media (max-width: 560px) {
  .landing-stats > div {
    min-width: 0;
    flex: 1;
  }
}

.showcase-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 54px;
}

.showcase-heading h2 {
  margin-bottom: 12px;
}

.showcase-heading p:last-child {
  max-width: 620px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.showcase-controls {
  display: flex;
  gap: 8px;
}

.showcase-button {
  min-width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text-primary);
  cursor: pointer;
  transition: border-color 180ms ease, transform 180ms ease;
}

.showcase-button:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.showcase-button--wide {
  min-width: 88px;
}

.showcase-layout {
  display: grid;
  grid-template-columns: minmax(300px, 0.9fr) minmax(320px, 1.1fr);
  align-items: center;
  gap: clamp(48px, 8vw, 120px);
}

.showcase-stage {
  position: relative;
  display: grid;
  min-height: 650px;
  place-items: center;
}

.showcase-stage__glow {
  position: absolute;
  width: min(85%, 460px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--accent) 32%, transparent), transparent 68%);
  filter: blur(18px);
  animation: showcase-breathe 5s ease-in-out infinite alternate;
}

.showcase-phone {
  position: relative;
  width: min(78vw, 320px);
  aspect-ratio: 9 / 16;
  padding: 8px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 34px;
  background: #07080a;
  box-shadow: 0 36px 90px rgba(0, 0, 0, 0.52);
  transform: rotate(-2deg);
}

.showcase-phone video {
  width: 100%;
  height: 100%;
  border-radius: 27px;
  background: #07080a;
  object-fit: cover;
}

.showcase-kicker {
  display: inline-flex;
  padding: 7px 10px;
  border: 1px solid color-mix(in srgb, var(--accent) 42%, transparent);
  border-radius: 999px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
}

.showcase-copy h3 {
  max-width: 680px;
  margin: 20px 0 12px;
  font-size: clamp(2.1rem, 5vw, 4.5rem);
  line-height: 1.06;
  letter-spacing: -0.06em;
}

.showcase-copy > p {
  color: var(--text-secondary);
  font-size: 16px;
}

.showcase-copy > a {
  display: inline-block;
  margin-top: 22px;
  color: var(--text-primary);
  font-size: 14px;
  text-decoration-color: var(--text-muted);
  text-underline-offset: 5px;
}

.showcase-tabs {
  display: flex;
  gap: 8px;
  margin-top: 38px;
}

.showcase-tabs button {
  width: 48px;
  height: 48px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: background-color 180ms ease, color 180ms ease, transform 180ms ease;
}

.showcase-tabs button.is-active {
  background: var(--accent);
  color: white;
  transform: scale(1.08);
}

@keyframes showcase-breathe {
  to {
    transform: scale(1.12);
    opacity: 0.64;
  }
}

@media (max-width: 900px) {
  .showcase-heading {
    align-items: start;
    flex-direction: column;
  }

  .showcase-layout {
    grid-template-columns: 1fr;
  }

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

  .showcase-tabs,
  .showcase-controls {
    justify-content: center;
  }
}

@media (max-width: 640px) {
  .auth-dialog__panel {
    padding: 28px 24px;
  }

  .showcase-stage {
    min-height: 590px;
  }

  .showcase-copy h3 {
    font-size: 2.6rem;
  }
}

@media (max-width: 719px) {
  html[data-layout-mode="mobile"] .showcase-layout {
    display: flex;
    flex-direction: column;
    gap: 28px;
  }

  html[data-layout-mode="mobile"] .showcase-stage {
    min-height: auto;
    padding: 8px 0 0;
  }

  html[data-layout-mode="mobile"] .showcase-phone {
    width: min(82vw, 300px);
    transform: none;
  }

  html[data-layout-mode="mobile"] .showcase-copy {
    text-align: center;
  }

  html[data-layout-mode="mobile"] .showcase-copy h3 {
    max-width: 100%;
    font-size: clamp(2rem, 11vw, 2.8rem);
  }

  html[data-layout-mode="mobile"] .showcase-tabs {
    justify-content: flex-start;
    max-width: 100%;
    overflow-x: auto;
    padding: 4px 2px 8px;
    scrollbar-width: none;
  }

  html[data-layout-mode="mobile"] .showcase-tabs::-webkit-scrollbar {
    display: none;
  }

  html[data-layout-mode="mobile"] .showcase-tabs button,
  html[data-layout-mode="mobile"] .showcase-button,
  html[data-layout-mode="mobile"] .button {
    min-height: 44px;
  }

  html[data-layout-mode="mobile"] .showcase-tabs button {
    flex: 0 0 48px;
  }

  html[data-layout-mode="mobile"] .steps-grid {
    grid-template-columns: 1fr;
  }

  html[data-layout-mode="mobile"] .reviews-grid {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    padding-bottom: 8px;
    scroll-snap-type: x mandatory;
    scrollbar-width: none;
  }

  html[data-layout-mode="mobile"] .reviews-grid::-webkit-scrollbar {
    display: none;
  }

  html[data-layout-mode="mobile"] .review-card {
    flex: 0 0 min(82vw, 300px);
    scroll-snap-align: start;
  }

  html[data-layout-mode="mobile"] .url-form input {
    min-height: 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .showcase-stage__glow {
    animation: none;
  }

  .showcase-button,
  .showcase-tabs button {
    transition-duration: 0.01ms;
  }
}

.google-auth-button {
  /* Google 공식 브랜딩 가이드라인(Dark 테마). 앱 검증 요건이라 임의 변경 금지.
     Fill #131314 / Stroke #8E918F 1px inside / Font #E3E3E3 Roboto Medium 14-20 */
  width: 100%;
  margin-top: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 40px;
  padding: 0 12px;
  border: 1px solid #8e918f;
  border-radius: 4px;
  background: #131314;
  color: #e3e3e3;
  font-family: Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  font-weight: 500;
  line-height: 20px;
  cursor: pointer;
}

.google-auth-button:hover {
  background: #1e1f20;
}

.google-auth-button:focus-visible {
  outline: 2px solid #8e918f;
  outline-offset: 2px;
}

.google-auth-button__logo {
  /* 로고는 크기·색 변경 불가 */
  flex: none;
  width: 18px;
  height: 18px;
}