/* =========================
   Apple-like 極簡學術個人網頁樣式
   說明：
   1. 採用大量留白與柔和灰階色系
   2. 使用 system font，貼近 Apple 風格
   3. 版面支援桌機、平板、手機
   ========================= */

:root {
  --bg: #f5f5f7;
  --bg-alt: #ffffff;
  --text: #1d1d1f;
  --text-soft: #6e6e73;
  --line: rgba(0, 0, 0, 0.08);
  --line-strong: rgba(0, 0, 0, 0.14);
  --card: rgba(255, 255, 255, 0.86);
  --shadow: 0 12px 30px rgba(15, 23, 42, 0.06);
  --radius: 22px;
  --radius-sm: 14px;
  --nav-height: 72px;
  --max-width: 1160px;
  --accent: #0071e3;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.75;
  letter-spacing: 0.01em;
}

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

a {
  color: inherit;
  text-decoration: none;
}

p {
  margin: 0 0 1rem;
}

.container {
  width: min(100% - 2rem, var(--max-width));
  margin: 0 auto;
}

/* 導覽列 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(245, 245, 247, 0.78);
  backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.site-header.scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.04);
}

.navbar {
  min-height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.3rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-menu a {
  font-size: 0.95rem;
  color: var(--text-soft);
  transition: color 0.2s ease;
}

.nav-menu a:hover {
  color: var(--text);
}

.menu-toggle {
  display: none;
  width: 46px;
  height: 46px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.75);
  border-radius: 14px;
  cursor: pointer;
  padding: 0;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 999px;
}

/* Hero 輪播 */
.hero {
  position: relative;
}

.hero-slider {
  position: relative;
  height: 42vh;
  min-height: 320px;
  max-height: 520px;
  overflow: hidden;
  background: #111;
}

.slide {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center center;
  opacity: 0;
  transition: opacity 1s ease;
  transform: scale(1.02);
}

.slide.active {
  opacity: 1;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(0, 0, 0, 0.12), rgba(0, 0, 0, 0.08)),
    linear-gradient(90deg, rgba(0, 0, 0, 0.28), rgba(0, 0, 0, 0.04) 55%);
  z-index: 2;
}

.hero-content {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2.8rem;
  z-index: 3;
  color: #fff;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 0.8rem;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(10px);
}

.hero h1 {
  margin: 0 0 0.65rem;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.08;
  font-weight: 600;
}

.hero-subtitle {
  max-width: 620px;
  font-size: clamp(0.98rem, 1.3vw, 1.15rem);
  color: rgba(255, 255, 255, 0.9);
  margin: 0;
}

.slider-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 4;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
  font-size: 1.25rem;
  cursor: pointer;
  backdrop-filter: blur(10px);
  transition: background 0.2s ease;
}

.slider-btn:hover {
  background: rgba(255, 255, 255, 0.26);
}

.slider-btn.prev {
  left: 1rem;
}

.slider-btn.next {
  right: 1rem;
}

.slider-dots {
  position: absolute;
  left: 50%;
  bottom: 1.1rem;
  transform: translateX(-50%);
  display: flex;
  gap: 0.55rem;
  z-index: 4;
}

.dot {
  width: 10px;
  height: 10px;
  border: none;
  padding: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.42);
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease;
}

.dot.active {
  background: rgba(255, 255, 255, 0.95);
  transform: scale(1.15);
}

/* 區塊 */
.section {
  padding: 5.2rem 0;
}

.section-alt {
  background: linear-gradient(180deg, rgba(255,255,255,0.55), rgba(255,255,255,0.92));
}

.section-heading {
  margin-bottom: 2rem;
}

.section-kicker {
  color: var(--text-soft);
  font-size: 0.86rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  line-height: 1.15;
  font-weight: 600;
}

/* 卡片 */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.6rem;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.card + .card {
  margin-top: 1rem;
}

.two-column {
  display: grid;
  grid-template-columns: 1.3fr 0.9fr;
  gap: 1.5rem;
  align-items: start;
}

.name-title {
  margin-top: 0;
  margin-bottom: 0.45rem;
  font-size: 1.6rem;
  font-weight: 600;
}

.muted {
  color: var(--text-soft);
}

.small-note {
  font-size: 0.92rem;
  margin-top: 1rem;
}

.contact-mini {
  display: grid;
  gap: 1rem;
}

.mini-item {
  display: grid;
  gap: 0.3rem;
}

.mini-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-soft);
}

/* Grid */
.grid {
  display: grid;
  gap: 1rem;
}

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

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

.center-card {
  text-align: center;
}

/* Timeline */
.timeline {
  display: grid;
  gap: 1rem;
}

.timeline-item {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 1rem;
  align-items: start;
}

.timeline-year {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-soft);
  padding-top: 0.2rem;
}

.timeline-content h3 {
  margin: 0 0 0.4rem;
  font-size: 1.15rem;
  font-weight: 600;
}

/* Research chips */
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  padding: 0.65rem 1rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--line);
  color: var(--text-soft);
  font-size: 0.92rem;
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.04);
}

/* Publications */
.pub-list {
  margin: 0;
  padding-left: 1.4rem;
}

.pub-list li {
  margin-bottom: 0.95rem;
}

/* Projects */
.project-meta {
  display: inline-block;
  margin-bottom: 0.75rem;
  font-size: 0.82rem;
  color: var(--text-soft);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* Skills list */
.clean-list {
  margin: 0;
  padding-left: 1.1rem;
}

.clean-list li + li {
  margin-top: 0.4rem;
}

/* Contact */
.contact-card {
  display: grid;
  gap: 1.5rem;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 1.5rem;
}

.contact-grid p {
  margin: 0.25rem 0 0;
}

/* Footer */
.site-footer {
  padding: 1.4rem 0 2.2rem;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.7);
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.footer-content p {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.94rem;
}

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

.back-top:hover {
  color: var(--text);
}

/* 淡入動畫 */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.show {
  opacity: 1;
  transform: translateY(0);
}

/* RWD */
@media (max-width: 960px) {
  .grid-3 {
    grid-template-columns: 1fr 1fr;
  }

  .two-column,
  .grid-2,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .hero-slider {
    height: 38vh;
    min-height: 300px;
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: inline-flex;
  }

  .nav-menu {
    position: absolute;
    top: calc(100% + 0.6rem);
    right: 1rem;
    width: min(320px, calc(100% - 2rem));
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: 0 18px 36px rgba(15, 23, 42, 0.08);
    padding: 0.9rem;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0.3rem;
  }

  .nav-menu.open {
    display: flex;
  }

  .nav-menu li {
    width: 100%;
  }

  .nav-menu a {
    display: block;
    width: 100%;
    padding: 0.8rem 0.9rem;
    border-radius: 12px;
  }

  .nav-menu a:hover {
    background: rgba(0, 0, 0, 0.04);
  }

  .slider-btn {
    width: 38px;
    height: 38px;
  }

  .hero-content {
    bottom: 3.3rem;
  }

  .section {
    padding: 4rem 0;
  }

  .card {
    padding: 1.25rem;
  }
}

@media (max-width: 560px) {
  .hero-slider {
    height: 34vh;
    min-height: 260px;
    max-height: 360px;
  }

  .hero-content {
    bottom: 3.4rem;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

  .hero-subtitle {
    font-size: 0.95rem;
  }

  .grid-3 {
    grid-template-columns: 1fr;
  }

  .footer-content {
    flex-direction: column;
    align-items: flex-start;
  }
}
/* =========================
   語言切換按鈕（EN / 中文）
   ========================= */
.nav-right {
  display: flex;
  align-items: center;
  gap: 1.1rem;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(10px);
  flex-shrink: 0;
}

.lang-btn {
  border: none;
  background: transparent;
  color: var(--text-soft);
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  line-height: 1;
  padding: 0.34rem 0.72rem;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.lang-btn:hover {
  color: var(--text);
}

.lang-btn[aria-pressed="true"] {
  background: #ffffff;
  color: var(--text);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.lang-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (max-width: 768px) {
  .nav-right {
    gap: 0.7rem;
  }

  .lang-btn {
    padding: 0.3rem 0.6rem;
    font-size: 0.8rem;
  }
}

/* 尊重使用者的「減少動態效果」偏好設定 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}