/* =========================
   1. 全局基礎設定
   ========================= */

:root {
  /* 外層膠囊 / 面板整體展開速度 */
  --menu-panel-expand-duration: 0.24s;

  /* 外層膠囊 / 面板回彈動畫時間 */
  --menu-open-bounce-duration: 0.34s;

  /* 收起後膠囊回彈動畫時間 */
  --menu-close-bounce-duration: 0.20s;

  /* 整體展開動畫的節奏 */
  --menu-motion-ease: cubic-bezier(0.22, 1, 0.36, 1);

  /* 內容要延遲多久才開始出現 */
  --menu-content-show-delay: 0.12s;

  /* 內容淡入淡出的時間 */
  --menu-content-fade-duration: 0.08s;

  /* 收起時先讓文字消失，再開始收面板的等待時間 */
  --menu-close-delay: 0.06s;

  /* 收合時膠囊寬度 */
  --pill-width: 120px;

  /* 收合時膠囊高度 */
  --pill-height: 52px;

  /* 展開後面板寬度 */
  --panel-width: 230px;

  /* 展開後面板高度 */
  --panel-height: 260px;

  /* 收合時膠囊圓角 */
  --pill-radius: 26px;

  /* 展開後面板圓角 */
  --panel-radius: 26px;

  /* 高級霧面玻璃主表面 */
  --glass-surface: rgba(88, 88, 88, 0.68);

  /* 深一點的霧面玻璃表面 */
  --glass-surface-strong: rgba(74, 74, 74, 0.76);

  /* 次級玻璃表面 */
  --glass-surface-subtle: rgba(66, 66, 66, 0.58);

  /* 低對比玻璃邊框 */
  --glass-border: rgba(255, 255, 255, 0.18);

  /* 柔和玻璃陰影 */
  --glass-shadow:
    0 16px 36px rgba(0, 0, 0, 0.14),
    0 2px 10px rgba(0, 0, 0, 0.06);

  /* 輕微內部高光 */
  --glass-inner-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.14);

  /* 玻璃文字顏色 */
  --glass-text: rgba(255, 255, 255, 0.94);
}

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

html {
  font-size: 16px;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: sans-serif;
  background: #ffffff;
  color: #222;
}

button,
a {
  font: inherit;
}

button {
  color: inherit;
}

.page-back-button {
  position: absolute;
  top: 16px;
  left: 18px;
  z-index: 20;
  text-decoration: none;
  border: none;
  background: transparent;
  padding: 0;
  color: rgba(95, 103, 114, 0.92);
  line-height: 1;
  cursor: pointer;
  transition:
    opacity 0.18s ease,
    transform 0.18s ease;
}

.page-back-icon {
  display: block;
  width: 24px;
  height: 24px;
}

.page-back-button:hover {
  opacity: 0.7;
  transform: translateX(-1px);
}

.page-back-button:focus-visible {
  outline: 2px solid rgba(95, 103, 114, 0.22);
  outline-offset: 6px;
  border-radius: 8px;
}


/* =========================
   2. 主內容區
   ========================= */

.main-content {
  max-width: 700px;
  margin: 0 auto;
  padding: 100px 20px 160px;
  text-align: center;
}

.intro-section {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.logo {
  font-size: 40px;
  line-height: 1;
  margin-bottom: 20px;
}

.intro-text {
  width: 100%;
}

.intro-text p {
  margin: 0 0 16px;
  font-size: 1.125rem;
  line-height: 1.7;
}

.intro-text p:last-child {
  margin-bottom: 0;
}

.content-section {
  margin-top: 88px;
  text-align: left;
}

.section-title {
  margin: 0 0 20px;
  font-size: 2rem;
  line-height: 1.1;
  color: rgba(34, 34, 34, 0.94);
}

.section-placeholder {
  padding: 28px 24px;
  border: 1px solid rgba(34, 34, 34, 0.08);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.72);
  color: rgba(34, 34, 34, 0.66);
  line-height: 1.7;
}

.page-main {
  max-width: 760px;
  margin: 0 auto;
  padding: 120px 20px 180px;
}

.page-hero {
  text-align: left;
}

.page-eyebrow {
  margin: 0 0 12px;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(34, 34, 34, 0.5);
}

.page-title {
  margin: 0;
  font-size: clamp(3rem, 8vw, 5rem);
  line-height: 0.96;
  color: rgba(34, 34, 34, 0.94);
}

.page-subtitle {
  max-width: 520px;
  margin: 18px 0 0;
  font-size: 1.05rem;
  line-height: 1.7;
  color: rgba(34, 34, 34, 0.62);
}

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

.notes-page {
  max-width: 980px;
  margin: 0 auto;
  padding: 40px 56px 180px;
}

.notes-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.notes-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.notes-brand-mark {
  font-size: 1.9rem;
  line-height: 1;
}

.notes-brand-name {
  font-size: 1rem;
  line-height: 1;
  color: rgba(34, 34, 34, 0.94);
}

.notes-header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.notes-icon-button {
  border: none;
  background: transparent;
  padding: 0;
  font-size: 1.35rem;
  line-height: 1;
  color: rgba(34, 34, 34, 0.88);
}

.notes-tabs {
  display: flex;
  align-items: flex-end;
  gap: 24px;
  margin-top: 40px;
  padding-bottom: 8px;
  border-bottom: 2px solid rgba(34, 34, 34, 0.08);
}

.notes-tab {
  border: none;
  background: transparent;
  padding: 0 0 8px;
  font-size: 0.9rem;
  line-height: 1;
  color: rgba(75, 88, 98, 0.68);
}

.notes-tab.active {
  color: rgba(34, 34, 34, 0.94);
  box-shadow: inset 0 -3px 0 rgba(34, 34, 34, 0.9);
}

.notes-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 44px 26px;
  margin-top: 44px;
}

.note-card {
  min-width: 0;
}

.note-card-preview {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 172px;
  padding: 20px;
  border-radius: 24px;
  background: rgba(231, 240, 251, 0.92);
}

.note-paper {
  width: 114px;
  aspect-ratio: 3 / 4;
  height: auto;
  border-radius: 6px;
  background: #fff;
  box-shadow:
    0 10px 22px rgba(15, 23, 42, 0.10),
    0 2px 8px rgba(15, 23, 42, 0.06);
}

.note-paper-image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 6px;
}

.note-paper-text {
  background:
    linear-gradient(#ffffff, #ffffff),
    repeating-linear-gradient(
      to bottom,
      transparent 0,
      transparent 16px,
      rgba(90, 90, 90, 0.08) 16px,
      rgba(90, 90, 90, 0.08) 18px
    );
  background-blend-mode: normal;
}

.note-paper-thin {
  width: 114px;
}

.note-card-title {
  margin: 16px 0 6px;
  font-size: clamp(0.98rem, 1.3vw, 1.15rem);
  line-height: 1.2;
  color: rgba(34, 34, 34, 0.94);
}

.note-card-meta {
  margin: 0;
  font-size: 0.74rem;
  line-height: 1.4;
  color: rgba(98, 106, 116, 0.76);
}


/* =========================
   3. 主頁面 Footer
   ========================= */

.site-footer {
  margin-top: 80px;
  padding: 40px 20px 140px;
  background: rgba(34, 34, 34, 0.04);
}

.footer-inner {
  max-width: 700px;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  gap: 20px;
  align-items: center;
  text-align: center;
}

.footer-link {
  color: rgba(34, 34, 34, 0.82);
  text-decoration: none;
  font-size: 0.96rem;
  line-height: 1.4;
  transition: opacity 0.18s ease;
}

.footer-link-icon-only {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
}

.footer-home-icon {
  width: 22px;
  height: 22px;
}

.footer-link:hover {
  opacity: 0.6;
}

.footer-socials {
  display: inline-flex;
  list-style: none;
  width: 100%;
  margin: 28px 0 0;
  padding: 0;
  justify-content: center;
  gap: 14px;
}

.footer-social {
  position: relative;
}

.footer-social-link {
  position: relative;
  background: #fff;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  font-size: 18px;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  color: rgba(34, 34, 34, 0.82);
  text-decoration: none;
  box-shadow: 0 10px 10px rgba(0, 0, 0, 0.08);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.footer-social-tooltip {
  position: absolute;
  top: 0;
  font-size: 14px;
  background: #fff;
  color: #fff;
  padding: 5px 8px;
  border-radius: 5px;
  box-shadow: 0 10px 10px rgba(0, 0, 0, 0.1);
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  white-space: nowrap;
}

.footer-social-tooltip::before {
  position: absolute;
  content: "";
  height: 8px;
  width: 8px;
  background: #fff;
  bottom: -3px;
  left: 50%;
  transform: translate(-50%) rotate(45deg);
  transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}


/* =========================
   4. 底部膠囊 Menu
   ========================= */

.pill-menu {
  --panel-side-gap: 10px;
  --panel-content-side-padding: 20px;
  --header-open-radius: 28px;
  --pill-glass-border: var(--glass-border);
  --pill-glass-shadow: var(--glass-shadow), var(--glass-inner-highlight);

  position: fixed;
  left: 50%;
  bottom: 30px;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column-reverse;

  width: var(--pill-width);
  height: var(--pill-height);
  background: var(--glass-surface);
  color: var(--glass-text);
  border: 1px solid var(--pill-glass-border);
  border-radius: var(--pill-radius);
  backdrop-filter: blur(16px) saturate(120%);
  -webkit-backdrop-filter: blur(16px) saturate(120%);
  box-shadow: var(--pill-glass-shadow);
  overflow: hidden;
  transform-origin: center bottom;
  will-change: transform;

  z-index: 1000;
  transition:
    width var(--menu-panel-expand-duration) var(--menu-motion-ease),
    height var(--menu-panel-expand-duration) var(--menu-motion-ease),
    border-radius var(--menu-panel-expand-duration) var(--menu-motion-ease),
    border-color var(--menu-panel-expand-duration) var(--menu-motion-ease),
    box-shadow var(--menu-panel-expand-duration) var(--menu-motion-ease),
    background-color var(--menu-panel-expand-duration) var(--menu-motion-ease);
}

.pill-menu.open {
  width: min(var(--panel-width), calc(100vw - 50px));
  height: var(--panel-height);
  background: var(--glass-surface-strong);
  color: var(--glass-text);
  border-color: var(--glass-border);
  border-radius: var(--panel-radius);
  box-shadow:
    0 20px 48px rgba(15, 23, 42, 0.12),
    0 6px 18px rgba(15, 23, 42, 0.06),
    inset 0 1px 0 rgba(255, 255, 255, 0.24);
  animation: menu-open-bounce var(--menu-open-bounce-duration) var(--menu-motion-ease);
}

.pill-menu.closing {
  animation:
    menu-close-bounce
    var(--menu-close-bounce-duration)
    var(--menu-motion-ease)
    calc(var(--menu-close-delay) + var(--menu-panel-expand-duration));
}

.pill-menu::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.16) 0%,
      rgba(255, 255, 255, 0.08) 24%,
      rgba(255, 255, 255, 0.02) 42%,
      rgba(255, 255, 255, 0) 64%
    );
  pointer-events: none;
  opacity: 0.56;
  transition: opacity var(--menu-panel-expand-duration) var(--menu-motion-ease);
}

.pill-menu.open::before {
  opacity: 0.8;
}

.pill-menu-header {
  flex-shrink: 0;
  width: 100%;
  height: var(--pill-height);
  padding: 0 20px;
  border: none;
  margin: 0;
  background: transparent;
  border-radius: var(--pill-radius);
  cursor: pointer;

  display: flex;
  align-items: center;
  justify-content: center;
  transform: translateY(0);
  transition:
    background-color var(--menu-panel-expand-duration) var(--menu-motion-ease),
    border-color var(--menu-panel-expand-duration) var(--menu-motion-ease),
    border-radius var(--menu-panel-expand-duration) var(--menu-motion-ease),
    width var(--menu-panel-expand-duration) var(--menu-motion-ease),
    margin var(--menu-panel-expand-duration) var(--menu-motion-ease),
    transform var(--menu-panel-expand-duration) var(--menu-motion-ease),
    box-shadow var(--menu-panel-expand-duration) var(--menu-motion-ease);
}

.pill-menu.open .pill-menu-header {
  width: calc(100% - (var(--panel-side-gap) * 2));
  margin: 0 var(--panel-side-gap) var(--panel-side-gap);
  background: var(--glass-surface-subtle);
  border: 1px solid var(--pill-glass-border);
  border-radius: var(--header-open-radius);
  backdrop-filter: blur(14px) saturate(115%);
  -webkit-backdrop-filter: blur(14px) saturate(115%);
  transform: translateY(2px);
  box-shadow:
    0 8px 20px rgba(15, 23, 42, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.pill-menu-header:focus-visible {
  outline: 3px solid rgba(160, 174, 192, 0.28);
  outline-offset: -6px;
}

.pill-menu-label {
  font-size: 1rem;
  line-height: 1;
}

.pill-menu-content {
  flex: 1;
  height: calc(100% - var(--pill-height));
  padding: 24px 24px 28px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(0);
  pointer-events: none;
  transition:
    opacity var(--menu-content-fade-duration) linear 0s,
    transform var(--menu-content-fade-duration) linear 0s,
    visibility 0s linear var(--menu-content-fade-duration);
}

.pill-menu.open .pill-menu-content {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
  transition:
    opacity var(--menu-content-fade-duration) linear var(--menu-content-show-delay),
    transform var(--menu-content-fade-duration) linear var(--menu-content-show-delay),
    visibility 0s linear 0s;
}

.pill-menu.closing .pill-menu-content {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity var(--menu-content-fade-duration) linear 0s,
    visibility 0s linear var(--menu-content-fade-duration);
}

.pill-menu-list {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
}

.pill-menu-item {
  display: block;
  padding: 0;
  color: rgba(255, 255, 255, 0.96);
  text-decoration: none;
  opacity: 0.88;
  line-height: 1.2;
}

.pill-menu-item:hover {
  opacity: 1;
}

.pill-menu-item:last-child {
  border-bottom: none;
}

@keyframes menu-open-bounce {
  0% {
    transform: translateX(-50%) scale(0.96);
  }

  62% {
    transform: translateX(-50%) scale(1.02);
  }

  100% {
    transform: translateX(-50%) scale(1);
  }
}

@keyframes menu-close-bounce {
  0% {
    transform: translateX(-50%) scale(1);
  }

  60% {
    transform: translateX(-50%) scale(0.975);
  }

  100% {
    transform: translateX(-50%) scale(1);
  }
}

/* =========================
   5. 右側語言圓盤
   ========================= */

.language-dial {
  --dial-size: 52px;
  --dial-option-size: 50px;
  --dial-bg: var(--glass-surface);
  --dial-bg-hover: var(--glass-surface-strong);
  --dial-option-bg: var(--glass-surface-subtle);
  --dial-option-border: var(--glass-border);

  position: fixed;
  right: 30px;
  bottom: 30px;
  z-index: 1001;
}

.language-dial-trigger {
  position: relative;
  z-index: 2;
  width: var(--dial-size);
  height: var(--dial-size);
  border: none;
  border-radius: 50%;
  background: var(--dial-bg);
  color: var(--glass-text);
  box-shadow:
    0 14px 30px rgba(15, 23, 42, 0.10),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(16px) saturate(118%);
  -webkit-backdrop-filter: blur(16px) saturate(118%);
  cursor: pointer;
  transition:
    transform 0.22s var(--menu-motion-ease),
    background-color 0.22s var(--menu-motion-ease),
    box-shadow 0.22s var(--menu-motion-ease);
}

.language-dial-trigger:hover {
  background: var(--dial-bg-hover);
}

.language-dial-trigger:focus-visible {
  outline: 3px solid rgba(160, 174, 192, 0.28);
  outline-offset: 4px;
}

.language-dial.open .language-dial-trigger {
  transform: rotate(45deg) scale(0.96);
}

.language-dial-icon {
  display: block;
  width: 24px;
  height: 24px;
  margin: 0 auto;
}

.language-dial-options {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.language-option {
  position: absolute;
  top: calc((var(--dial-size) - var(--dial-option-size)) / 2);
  left: calc((var(--dial-size) - var(--dial-option-size)) / 2);
  width: var(--dial-option-size);
  height: var(--dial-option-size);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--dial-option-border);
  border-radius: 50%;
  background: var(--dial-option-bg);
  color: var(--glass-text);
  backdrop-filter: blur(14px) saturate(115%);
  -webkit-backdrop-filter: blur(14px) saturate(115%);
  box-shadow:
    0 10px 24px rgba(15, 23, 42, 0.10),
    inset 0 1px 0 rgba(255, 255, 255, 0.18);
  cursor: pointer;
  opacity: 0;
  transform: translate(0, 0) scale(0.4);
  transition:
    transform 0.22s var(--menu-motion-ease),
    opacity 0.18s linear,
    background-color 0.18s ease;
  font-size: 0.78rem;
  line-height: 1.1;
  white-space: nowrap;
  text-align: center;
}

.language-option:hover {
  background: var(--glass-surface-strong);
}

.language-option[aria-pressed="true"] {
  background: rgba(58, 121, 255, 0.88);
  border-color: rgba(58, 121, 255, 0.96);
  color: rgba(255, 255, 255, 0.98);
  box-shadow:
    0 12px 28px rgba(58, 121, 255, 0.24),
    inset 0 1px 0 rgba(255, 255, 255, 0.22);
}

.language-dial.open .language-dial-options {
  pointer-events: auto;
}

.language-dial.open .language-option {
  opacity: 1;
}

.language-dial.open .language-option:nth-child(1) {
  transform: translate(0, -72px) scale(1);
  transition-delay: 0.02s;
}

.language-dial.open .language-option:nth-child(2) {
  transform: translate(-56px, -56px) scale(1);
  transition-delay: 0.05s;
}

.language-dial.open .language-option:nth-child(3) {
  transform: translate(-72px, 0) scale(1);
  transition-delay: 0.08s;
}

/* =========================
   6. 手機版微調
   ========================= */

@media (max-width: 480px) {
  .page-back-button {
    top: 24px;
    left: 12px;
  }

  .page-back-icon {
    width: 22px;
    height: 22px;
  }

  .main-content {
    padding-top: 72px;
    padding-bottom: 150px;
  }

  .intro-text p {
    font-size: 1rem;
  }

  .content-section {
    margin-top: 64px;
  }

  .notes-page {
    padding: 28px 20px 160px;
  }

  .notes-header {
    gap: 16px;
  }

  .notes-brand {
    gap: 12px;
    margin-left: 18px;
  }

  .notes-brand-mark {
    font-size: 2rem;
  }

  .notes-brand-name {
    font-size: 1rem;
  }

  .notes-header-actions {
    gap: 12px;
  }

  .notes-icon-button {
    font-size: 1.35rem;
  }

  .notes-tabs {
    gap: 22px;
    margin-top: 44px;
    overflow-x: auto;
    padding-bottom: 14px;
  }

  .notes-tab {
    font-size: 0.95rem;
    padding-bottom: 8px;
    white-space: nowrap;
  }

  .notes-grid {
    grid-template-columns: 1fr;
    gap: 52px;
    margin-top: 56px;
  }

  .note-card-preview {
    min-height: 180px;
    padding: 18px;
    border-radius: 24px;
  }

  .note-paper {
    width: 102px;
  }

  .note-paper-thin {
    width: 102px;
  }

  .note-card-title {
    margin-top: 14px;
    font-size: 1.35rem;
  }

  .note-card-meta {
    font-size: 0.88rem;
  }

  .page-main {
    padding: 88px 20px 160px;
  }

  .page-title {
    font-size: 2.65rem;
  }

  .page-subtitle {
    font-size: 1rem;
  }

  .section-title {
    font-size: 1.65rem;
  }

  .section-placeholder {
    padding: 22px 18px;
  }

  .site-footer {
    margin-top: 56px;
    padding: 32px 20px 140px;
  }

  .footer-inner {
    flex-direction: column;
    gap: 8px;
  }

  .pill-menu {
    width: calc(var(--pill-width) + 22px);
    bottom: 24px;
  }

  .pill-menu.open {
    width: min(180px, calc(100vw - 140px));
    height: 244px;
  }

  .pill-menu-content {
    padding: 20px 22px 24px;
  }

  .language-dial {
    right: 24px;
    bottom: 20px;
  }

  .language-option {
    top: 1px;
    left: 1px;
  }

  .language-dial.open .language-option:nth-child(1) {
    transform: translate(0, -64px) scale(1);
    transition-delay: 0.02s;
  }

  .language-dial.open .language-option:nth-child(2) {
    transform: translate(0, -126px) scale(1);
    transition-delay: 0.05s;
  }

  .language-dial.open .language-option:nth-child(3) {
    transform: translate(0, -188px) scale(1);
    transition-delay: 0.08s;
  }
}