html,
body {
  overflow-x: hidden;
}

img,
svg,
canvas,
video {
  max-width: 100%;
  height: auto;
}

input,
select,
textarea,
button {
  max-width: 100%;
}

@media (max-width: 900px) {
  .grid,
  .layout,
  .profile-head,
  .hero-top,
  .panel-head,
  .result-card,
  .friend-card {
    grid-template-columns: 1fr;
  }

  .hero-top,
  .panel-head,
  .result-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
  }

  .account-area,
  .auth-links,
  .friends-list,
  .result-actions {
    align-items: flex-start;
    justify-content: flex-start;
  }

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

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

  .brand-panel {
    display: none;
  }
}

@media (max-width: 768px) {
  body {
    padding-top: calc(16px + env(safe-area-inset-top));
    padding-right: calc(16px + env(safe-area-inset-right));
    padding-bottom: calc(88px + env(safe-area-inset-bottom));
    padding-left: calc(16px + env(safe-area-inset-left));
  }

  .page,
  .wrap {
    max-width: 100%;
  }

  .hero,
  .panel,
  .wrap {
    padding: 16px;
  }

  .hero-top,
  .account-area {
    gap: 10px;
  }

  .search-inline,
  .typing,
  .result-bar,
  form.profile-form {
    width: 100%;
    max-width: 100%;
  }

  .search-inline,
  .typing {
    min-width: 0;
  }

  .search-input,
  .typing input[type="text"] {
    width: auto;
    min-width: 0;
    flex: 1 1 auto;
  }

  .account-switch-menu {
    left: 0;
    right: auto;
    min-width: 0;
    width: min(320px, calc(100vw - 32px - env(safe-area-inset-left) - env(safe-area-inset-right)));
  }

  .profile-head,
  .friend-card {
    gap: 12px;
  }

  .avatar-wrap,
  .avatar {
    width: 88px;
    height: 88px;
  }

  .profile-head .avatar {
    width: 88px;
    height: 88px;
  }

  .socials-logos {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .socials-icon {
    width: clamp(88px, 28vw, 120px);
    height: clamp(88px, 28vw, 120px);
    font-size: clamp(64px, 18vw, 96px);
  }

  .options,
  .friends-grid {
    grid-template-columns: 1fr;
  }

  .options-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .stats {
    gap: 8px;
  }

  .stat,
  .option-btn {
    min-width: 0;
  }

  .examples li {
    grid-template-columns: 1fr;
  }

  .theme-toggle,
  .inbox-toggle,
  .chat-toggle,
  .suggestions-toggle {
    bottom: calc(12px + env(safe-area-inset-bottom));
    width: 40px;
    height: 40px;
  }

  .theme-toggle {
    left: calc(12px + env(safe-area-inset-left));
  }

  .inbox-toggle {
    left: calc(60px + env(safe-area-inset-left));
  }

  .chat-toggle {
    right: calc(60px + env(safe-area-inset-right));
  }

  .suggestions-toggle {
    right: calc(12px + env(safe-area-inset-right));
  }

  .settings-toggle {
    top: calc(12px + env(safe-area-inset-top));
    right: calc(12px + env(safe-area-inset-right));
    width: 40px;
    height: 40px;
  }

  .settings-panel,
  .chat-panel,
  .suggestions-panel,
  .inbox-panel {
    width: calc(100vw - 24px - env(safe-area-inset-left) - env(safe-area-inset-right));
    max-width: calc(100vw - 24px - env(safe-area-inset-left) - env(safe-area-inset-right));
  }

  .settings-panel {
    top: calc(60px + env(safe-area-inset-top));
    right: calc(12px + env(safe-area-inset-right));
    max-height: min(72dvh, 520px);
  }

  .chat-panel {
    right: calc(12px + env(safe-area-inset-right));
    bottom: calc(58px + env(safe-area-inset-bottom));
    max-height: min(72dvh, 560px);
  }

  .chat-body {
    min-height: min(52dvh, 420px);
  }

  .suggestions-panel {
    right: calc(12px + env(safe-area-inset-right));
    bottom: calc(58px + env(safe-area-inset-bottom));
    max-height: min(68dvh, 520px);
  }

  .suggestions-body,
  .settings-body,
  .inbox-list {
    min-height: 0;
  }

  .inbox-panel {
    left: calc(12px + env(safe-area-inset-left));
    bottom: calc(58px + env(safe-area-inset-bottom));
    height: min(56dvh, 420px);
  }

  .site-logo {
    top: calc(12px + env(safe-area-inset-top));
    left: calc(12px + env(safe-area-inset-left));
  }

  .kanji-quiz-page .layout {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .kanji-quiz-page .board {
    width: min(100%, 560px);
    aspect-ratio: 1 / 1;
    min-height: 0;
    margin: 0 auto;
  }

  .kanji-quiz-page .face {
    padding: 14px 14px 12px;
  }

  .kanji-quiz-page .board.revealed .prompt-main {
    font-size: clamp(2rem, 6vw, 3.2rem);
    min-height: 52px;
    margin-bottom: 4px;
  }

  .kanji-quiz-page .prompt-sub {
    font-size: 1.2rem;
    margin-bottom: 4px;
  }

  .kanji-quiz-page .readings {
    font-size: 0.9rem;
    line-height: 1.25;
    margin-bottom: 6px;
  }

  .kanji-quiz-page .examples {
    gap: 6px;
    font-size: 0.88rem;
    margin-top: 2px;
  }

  .kanji-quiz-page .examples li {
    gap: 6px;
    padding-top: 5px;
    align-items: start;
  }

  .kanji-quiz-page .options-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    width: 100%;
  }

  .kanji-quiz-page .option-btn {
    min-height: 112px;
    font-size: 1.2rem;
  }

  .kanji-quiz-page .option-btn.text-option {
    font-size: 1.05rem;
  }

  .kana-quiz-page .options {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .kana-quiz-page .typing {
    position: relative;
    width: min(100%, 420px);
    max-width: 420px;
    flex-direction: row;
  }

  .kana-quiz-page .submit-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 36px;
    height: 36px;
  }

  .kana-quiz-page .result-bar {
    width: min(100%, 420px);
  }

  .brand-panel {
    display: none;
  }
}

@media (max-width: 480px) {
  .hero,
  .panel,
  .wrap {
    padding: 14px;
    border-radius: 14px;
  }

  .brand,
  .title,
  .stage-title {
    line-height: 1.1;
  }

  .search-inline,
  .auth-links,
  .actions,
  .friend-actions,
  .result-actions {
    width: 100%;
  }

  .auth-links,
  .actions,
  .friend-actions,
  .result-actions {
    gap: 8px;
  }

  .btn,
  .home-btn,
  .next-btn,
  .friend-actions .btn,
  .result-actions .btn {
    width: 100%;
    justify-content: center;
  }

  .stats {
    grid-template-columns: 1fr;
  }

  .options-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .prompt-main {
    font-size: clamp(3.2rem, 18vw, 5rem);
    min-height: 88px;
  }

  .option-btn {
    min-height: 72px;
    font-size: 1.05rem;
  }

  .typing {
    max-width: 100%;
  }

  .result-bar {
    padding: 10px 12px;
  }

  .theme-toggle,
  .inbox-toggle,
  .chat-toggle,
  .suggestions-toggle,
  .settings-toggle {
    width: 38px;
    height: 38px;
    font-size: 1rem;
  }

  .inbox-toggle {
    left: calc(56px + env(safe-area-inset-left));
  }

  .chat-toggle {
    right: calc(56px + env(safe-area-inset-right));
  }

  .settings-panel,
  .suggestions-panel,
  .inbox-panel {
    width: calc(100vw - 20px - env(safe-area-inset-left) - env(safe-area-inset-right));
    max-width: calc(100vw - 20px - env(safe-area-inset-left) - env(safe-area-inset-right));
  }

  .settings-panel {
    right: calc(10px + env(safe-area-inset-right));
  }

  .suggestions-panel {
    right: calc(10px + env(safe-area-inset-right));
  }

  .inbox-panel {
    left: calc(10px + env(safe-area-inset-left));
  }

  .kanji-quiz-page .stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .kanji-quiz-page .options-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
  }

  .kanji-quiz-page .option-btn {
    min-height: 88px;
    padding: 8px;
    font-size: 1rem;
  }

  .kanji-quiz-page .option-btn.text-option {
    font-size: 0.92rem;
  }

  .kanji-quiz-page .prompt-main {
    font-size: clamp(3.2rem, 16vw, 5rem);
    min-height: 0;
  }

  .kanji-quiz-page .board.revealed .prompt-main {
    font-size: clamp(1.7rem, 7vw, 2.4rem);
    min-height: 40px;
    margin-bottom: 2px;
  }

  .kanji-quiz-page .prompt-sub {
    font-size: 1rem;
    margin-bottom: 2px;
  }

  .kanji-quiz-page .readings {
    font-size: 0.82rem;
    line-height: 1.2;
    margin-bottom: 4px;
  }

  .kanji-quiz-page .examples {
    gap: 4px;
    font-size: 0.78rem;
  }

  .kanji-quiz-page .examples li {
    gap: 4px;
    padding-top: 4px;
  }

  .kana-quiz-page .options {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

  .kana-quiz-page .option-btn {
    height: 68px;
    min-height: 68px;
    font-size: 1.5rem;
  }

  .kana-quiz-page .typing {
    width: 100%;
    max-width: 420px;
  }

  .kana-quiz-page input[type="text"] {
    padding-right: 52px;
  }

  .brand-panel {
    display: none;
  }
}