/* shared/ui.css */
/* Common UI utilities across AI Math Tutor and AI English Tutor */

:root {
  --safe-area-inset-top: env(safe-area-inset-top, 0px);
  --safe-area-inset-bottom: env(safe-area-inset-bottom, 0px);
  --keyboard-height: 0px;
}

/* iOS Safe Area Helper */
.pt-safe {
  padding-top: max(12px, var(--safe-area-inset-top));
}

.pb-safe {
  padding-bottom: max(12px, var(--safe-area-inset-bottom));
}

/* Toast entrance transition */
#toastNotification {
  animation: toastFadeIn 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes toastFadeIn {
  from {
    opacity: 0;
    transform: translate(-50%, 12px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translate(-50%, 0) scale(1);
  }
}

/* Smooth modal backdrop */
.modal-backdrop {
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

/* Custom minimal scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.4);
  border-radius: 9999px;
}

.dark ::-webkit-scrollbar-thumb {
  background: rgba(100, 116, 139, 0.4);
}

/* =========================================================================
   3-Theme System: ① ミニマル (minimal) / ② パステル (edutech) / ③ タイムライン (mobile)
   ========================================================================= */
:root,
html[data-theme="minimal"] {
  --font-body: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', -apple-system, BlinkMacSystemFont, sans-serif;
  --bg-main: #F8FAFC;
  --bg-card: #FFFFFF;
  --bg-subtle: #F1F5F9;
  --primary: #4F46E5;
  --primary-hover: #4338CA;
  --primary-soft: #EEF2FF;
  --accent: #10B981;
  --text-main: #0F172A;
  --text-muted: #64748B;
  --border-color: #E2E8F0;
  --radius-card: 18px;
  --radius-btn: 10px;
  --shadow-card: 0 8px 24px -4px rgba(15, 23, 42, 0.04), 0 2px 6px -1px rgba(15, 23, 42, 0.02);
  --btn-3d-shadow: none;
  --btn-active-transform: scale(0.98);
}

html[data-theme="edutech"] {
  --font-body: 'M PLUS Rounded 1c', 'Noto Sans JP', sans-serif;
  --bg-main: #FFFDF9;
  --bg-card: #FFFFFF;
  --bg-subtle: #FEF3C7;
  --primary: #10B981;
  --primary-hover: #059669;
  --primary-soft: #D1FAE5;
  --accent: #F59E0B;
  --text-main: #1E293B;
  --text-muted: #64748B;
  --border-color: #E2E8F0;
  --radius-card: 24px;
  --radius-btn: 16px;
  --shadow-card: 0 6px 0px #E2E8F0;
  --btn-3d-shadow: 0 4px 0px #047857;
  --btn-active-transform: translateY(3px);
}

html[data-theme="mobile"] {
  --font-body: 'Noto Sans JP', -apple-system, sans-serif;
  --bg-main: #F1F5F9;
  --bg-card: #FFFFFF;
  --bg-subtle: #F8FAFC;
  --primary: #2563EB;
  --primary-hover: #1D4ED8;
  --primary-soft: #DBEAFE;
  --accent: #8B5CF6;
  --text-main: #0F172A;
  --text-muted: #475569;
  --border-color: #CBD5E1;
  --radius-card: 20px;
  --radius-btn: 12px;
  --shadow-card: 0 4px 15px rgba(0, 0, 0, 0.05);
  --btn-3d-shadow: none;
  --btn-active-transform: scale(0.97);
}

/* Apply theme font & background transitions */
html[data-theme] body {
  font-family: var(--font-body) !important;
  transition: background-color 0.25s ease, color 0.25s ease;
}

html:not(.dark)[data-theme="minimal"] body,
html:not(.dark)[data-theme="minimal"] main {
  background-color: var(--bg-main) !important;
}

html:not(.dark)[data-theme="edutech"] body,
html:not(.dark)[data-theme="edutech"] main {
  background-color: #FFFDF9 !important;
}

html:not(.dark)[data-theme="edutech"] main section.bg-white,
html:not(.dark)[data-theme="edutech"] main .bg-white.rounded-2xl,
html:not(.dark)[data-theme="edutech"] main .bg-white.rounded-3xl,
html:not(.dark)[data-theme="edutech"] .step-card {
  border-radius: var(--radius-card) !important;
  box-shadow: var(--shadow-card) !important;
  border-color: #FDE68A !important;
}

html.dark[data-theme="edutech"] main section,
html.dark[data-theme="edutech"] .step-card {
  border-radius: var(--radius-card) !important;
  box-shadow: 0 5px 0px #1e293b !important;
}

html[data-theme="edutech"] #solveBtn,
html[data-theme="edutech"] #quizChallengeBtn,
html[data-theme="edutech"] #submitChoiceBtn,
html[data-theme="edutech"] #submitAnswerBtn,
html[data-theme="edutech"] #checkWritingBtn,
html[data-theme="edutech"] #generateQuizBtn,
html[data-theme="edutech"] #submitQuizBtn {
  border-radius: var(--radius-btn) !important;
  box-shadow: 0 4px 0px rgba(4, 120, 87, 0.85) !important;
  transition: transform 0.12s ease, box-shadow 0.12s ease !important;
}

html[data-theme="edutech"] #solveBtn:active,
html[data-theme="edutech"] #quizChallengeBtn:active,
html[data-theme="edutech"] #submitChoiceBtn:active,
html[data-theme="edutech"] #submitAnswerBtn:active,
html[data-theme="edutech"] #checkWritingBtn:active,
html[data-theme="edutech"] #generateQuizBtn:active,
html[data-theme="edutech"] #submitQuizBtn:active {
  transform: var(--btn-active-transform) !important;
  box-shadow: none !important;
}

/* Theme Pill Switcher UI */
.theme-pill-group {
  display: inline-flex;
  background: rgba(15, 23, 42, 0.35);
  padding: 2px;
  border-radius: 999px;
  gap: 2px;
  border: 1px solid rgba(255, 255, 255, 0.16);
}

.theme-btn {
  border: none;
  background: transparent;
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.8);
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: inherit;
  white-space: nowrap;
}

.theme-btn:hover {
  color: #FFFFFF;
}

.theme-btn.active {
  background: #FFFFFF;
  color: #0F172A;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.18);
}

/* ③ タイムライン (data-theme="mobile") 特化レイアウト */
html[data-theme="mobile"] body:has(#audioControlBar) {
  padding-bottom: calc(110px + var(--safe-area-inset-bottom)) !important;
}

/* 모바일 테마에서 하단 플로팅 오디오바와의 겹침 방지 */
html[data-theme="mobile"] #toastNotification {
  bottom: calc(96px + var(--safe-area-inset-bottom, 0px)) !important;
}

html[data-theme="mobile"] #audioControlBar {
  position: fixed !important;
  bottom: calc(14px + var(--safe-area-inset-bottom)) !important;
  top: auto !important;
  left: 50% !important;
  transform: translateX(-50%) !important;
  width: calc(100% - 1.5rem) !important;
  max-width: 640px !important;
  background: rgba(15, 23, 42, 0.95) !important;
  backdrop-filter: blur(12px) !important;
  -webkit-backdrop-filter: blur(12px) !important;
  z-index: 40 !important;
  border-radius: 24px !important;
  padding: 0.65rem 1rem !important;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.32) !important;
  border: 1px solid rgba(255, 255, 255, 0.15) !important;
}

html[data-theme="mobile"] #audioControlBar p {
  display: none !important;
}

html[data-theme="mobile"] #stepsContainer,
html[data-theme="mobile"] .sentence-breakdown-list {
  border-left: 3px solid var(--primary) !important;
  margin-left: 0.65rem !important;
  padding-left: 1.15rem !important;
  position: relative !important;
}

html[data-theme="mobile"] .step-card,
html[data-theme="mobile"] .breakdown-item {
  position: relative !important;
}

html[data-theme="mobile"] .step-card::before,
html[data-theme="mobile"] .breakdown-item::before {
  content: "";
  position: absolute;
  left: -1.6rem;
  top: 1.25rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--primary);
  border: 3px solid #FFFFFF;
  box-shadow: 0 0 0 2px var(--primary);
  z-index: 2;
}

html.dark[data-theme="mobile"] .step-card::before,
html.dark[data-theme="mobile"] .breakdown-item::before {
  border-color: #0F172A;
}

/* ===== iOS Safari: 16px 未満の入力欄はフォーカス時に自動ズームする ===== */
@media (max-width: 820px) {
  input[type="text"],
  input[type="password"],
  input[type="search"],
  input[type="email"],
  input[type="url"],
  input[type="tel"],
  input[type="number"],
  input:not([type]),
  textarea {
    font-size: 16px !important;
  }
}

/* sticky ヘッダーに隠れないようにスクロール余白を確保 */
.step-chat-box {
  scroll-margin-top: 88px;
}