/* ========================================
   杨钦宇 · YYYQYYY - 个人主页
   耀月银白 · 星星微动 · 专业严谨
   ======================================== */

/* ---------- CSS 变量 ---------- */
:root {
  --silver-50: #f8f9fa;
  --silver-100: #e9ecef;
  --silver-200: #dee2e6;
  --silver-300: #ced4da;
  --silver-400: #adb5bd;
  --silver-500: #6c757d;
  --silver-600: #495057;
  --silver-700: #343a40;
  --silver-800: #212529;

  --blue-400: #60a5fa;
  --blue-500: #4a90d9;
  --blue-600: #3b82f6;

  --text-primary: var(--silver-800);
  --text-secondary: var(--silver-600);
  --text-muted: var(--silver-400);
  --bg-body: var(--silver-50);
  --bg-card: rgba(255, 255, 255, 0.78);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.05), 0 2px 8px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.07), 0 4px 16px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.1);
  --radius-sm: 8px;
  --radius: 16px;
  --radius-lg: 24px;
  --transition: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- 重置 ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', sans-serif;
  color: var(--text-primary);
  line-height: 1.7;
  background: var(--bg-body);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; transition: var(--transition); }
img { max-width: 100%; height: auto; display: block; }

::selection { background: rgba(74, 144, 217, 0.15); color: var(--blue-600); }

/* ========== 星星背景 Canvas ========== */
#starsCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* ========== 进度条 ========== */
#progressBar {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--blue-400), var(--silver-400));
  z-index: 1001;
  transition: width 0.1s linear;
}

/* ========== 导航栏 ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 5%;
  height: 70px;
  background: rgba(248, 249, 250, 0.75);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(222, 226, 230, 0.5);
  z-index: 1000;
  transition: var(--transition);
}

.nav-brand {
  font-family: 'Noto Serif SC', serif;
  font-size: 1.4rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--silver-700), var(--blue-500));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 0.08em;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 4px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 8px 20px;
  border-radius: 100px;
  transition: var(--transition);
  position: relative;
}

.nav-links a::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 100px;
  background: rgba(74, 144, 217, 0.08);
  opacity: 0;
  transform: scale(0.85);
  transition: var(--transition);
  z-index: -1;
}

.nav-links a:hover::before,
.nav-links a.active::before {
  opacity: 1;
  transform: scale(1);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--blue-500);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  transition: var(--transition);
}

.nav-toggle:hover { background: var(--silver-100); }

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ========== 通用 Section ========== */
.section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 100px 5% 60px;
  position: relative;
  z-index: 1;
}

.section-container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
}

.section-title {
  font-family: 'Noto Serif SC', serif;
  font-size: clamp(2rem, 4vw, 2.4rem);
  font-weight: 600;
  color: var(--text-primary);
  text-align: center;
  margin-bottom: 48px;
  letter-spacing: 0.02em;
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: 56px;
  height: 3px;
  background: linear-gradient(90deg, var(--blue-400), var(--silver-400));
  border-radius: 2px;
}

/* ========== 首页 ========== */
.hero-section {
  background: linear-gradient(180deg, var(--silver-50) 0%, var(--silver-100) 100%);
}

.hero-content {
  text-align: center;
  position: relative;
  max-width: 700px;
}

.hero-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(74, 144, 217, 0.1) 0%, transparent 65%);
  border-radius: 50%;
  animation: glowPulse 5s ease-in-out infinite;
}

@keyframes glowPulse {
  0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.5; }
  50% { transform: translate(-50%, -50%) scale(1.12); opacity: 0.8; }
}

.hero-name {
  font-family: 'Noto Serif SC', serif;
  font-size: clamp(3rem, 8vw, 5rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 24px;
  position: relative;
  z-index: 1;
  letter-spacing: 0.06em;
  line-height: 1.2;
}

.hero-tags {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 36px;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

.hero-tag {
  padding: 8px 22px;
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(74, 144, 217, 0.15);
  border-radius: 100px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.hero-tag:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: rgba(74, 144, 217, 0.3);
}

.hero-motto {
  font-family: 'Noto Serif SC', serif;
  font-size: clamp(1.1rem, 2.5vw, 1.3rem);
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 48px;
  position: relative;
  z-index: 1;
  padding: 20px 32px;
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  border-radius: var(--radius);
  border: 1px solid rgba(74, 144, 217, 0.08);
  display: inline-block;
}

.hero-motto i {
  color: var(--blue-400);
  margin: 0 10px;
  font-size: 0.9rem;
  opacity: 0.7;
}

.scroll-btn {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.85rem;
  transition: var(--transition);
  position: relative;
  z-index: 1;
}

.scroll-btn:hover {
  color: var(--blue-500);
  transform: translateY(5px);
}

.scroll-btn i {
  animation: bounceDown 2.5s ease-in-out infinite;
}

@keyframes bounceDown {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
  40% { transform: translateY(8px); }
  60% { transform: translateY(4px); }
}

/* ========== 个人简介 ========== */
.profile-section {
  background: var(--silver-50);
}

.profile-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.profile-card {
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(222, 226, 230, 0.6);
  transition: var(--transition);
  opacity: 0;
  transform: translateY(30px);
}

.profile-card.visible {
  animation: cardIn 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.profile-card:nth-child(1).visible { animation-delay: 0s; }
.profile-card:nth-child(2).visible { animation-delay: 0.12s; }
.profile-card:nth-child(3).visible { animation-delay: 0.24s; }

@keyframes cardIn {
  to { opacity: 1; transform: translateY(0); }
}

.profile-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(74, 144, 217, 0.15);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(74, 144, 217, 0.12), rgba(173, 181, 189, 0.12));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--blue-500);
  font-size: 1.2rem;
  flex-shrink: 0;
  transition: var(--transition);
}

.profile-card:hover .card-icon {
  transform: scale(1.1) rotate(-5deg);
  background: linear-gradient(135deg, rgba(74, 144, 217, 0.18), rgba(173, 181, 189, 0.18));
}

.card-title {
  font-family: 'Noto Serif SC', serif;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
}

.card-content p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.8;
  margin-bottom: 16px;
}

.achievement-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(74, 144, 217, 0.07);
  border-radius: 100px;
  font-size: 0.85rem;
  color: var(--blue-500);
  margin: 0 8px 8px 0;
  transition: var(--transition);
}

.achievement-badge:hover {
  background: rgba(74, 144, 217, 0.14);
  transform: translateX(3px);
}

.card-images {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}

.cert-img {
  width: calc(50% - 5px);
  height: 110px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.cert-img:hover {
  transform: scale(1.03);
  box-shadow: var(--shadow-md);
}

/* 爱好卡片 */
.hobby-grid {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}

.hobby-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 14px 18px;
  background: rgba(74, 144, 217, 0.05);
  border-radius: var(--radius);
  flex: 1;
  transition: var(--transition);
}

.hobby-item:hover {
  background: rgba(74, 144, 217, 0.1);
  transform: translateY(-3px);
}

.hobby-item i {
  font-size: 1.4rem;
  color: var(--blue-500);
}

.hobby-item span {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.hobby-images {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.hobby-img {
  width: 100%;
  height: 90px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.hobby-img:hover {
  transform: scale(1.05);
}

/* ========== 实践与学业 ========== */
.practice-section {
  background: linear-gradient(180deg, var(--silver-100) 0%, var(--silver-50) 100%);
}

.practice-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
}

.subsection-title {
  font-family: 'Noto Serif SC', serif;
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.subsection-title i {
  color: var(--blue-400);
}

.practice-card,
.academic-card,
.awards-section,
.skills-section {
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(222, 226, 230, 0.6);
  transition: var(--transition);
  opacity: 0;
  transform: translateY(24px);
}

.practice-card.visible,
.academic-card.visible,
.awards-section.visible,
.skills-section.visible {
  animation: cardIn 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.practice-card:hover,
.academic-card:hover,
.awards-section:hover,
.skills-section:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(74, 144, 217, 0.12);
}

.practice-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.practice-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(74, 144, 217, 0.12), rgba(173, 181, 189, 0.12));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--blue-500);
  font-size: 1.1rem;
  flex-shrink: 0;
}

.practice-title h4 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.practice-role {
  font-size: 0.85rem;
  color: var(--blue-500);
}

.practice-content p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
}

.practice-image {
  margin-top: 14px;
}

.practice-image img {
  width: 100%;
  height: 170px;
  object-fit: cover;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.practice-image img:hover {
  transform: scale(1.02);
}

/* 学业 */
.academic-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.academic-header i {
  font-size: 1.8rem;
  color: var(--blue-400);
}

.academic-header h4 {
  font-size: 1.05rem;
  font-weight: 600;
}

.academic-header p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.academic-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.awards-section h4,
.skills-section h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
}

.awards-section h4 i { color: var(--blue-400); }
.skills-section h4 i { color: var(--blue-400); }

.award-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(222, 226, 230, 0.4);
  transition: var(--transition);
}

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

.award-item:hover {
  transform: translateX(6px);
}

.award-icon {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: rgba(74, 144, 217, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--blue-500);
  flex-shrink: 0;
}

.award-name {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  background: rgba(74, 144, 217, 0.08);
  border-radius: 100px;
  font-size: 0.85rem;
  color: var(--blue-500);
  transition: var(--transition);
}

.skill-tag:hover {
  background: rgba(74, 144, 217, 0.15);
  transform: translateY(-2px);
}

/* ========== 联系页 ========== */
.contact-section {
  background: linear-gradient(180deg, var(--silver-50) 0%, var(--silver-100) 100%);
  min-height: 70vh;
}

.contact-content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.contact-title {
  font-family: 'Noto Serif SC', serif;
  font-size: clamp(2rem, 4vw, 2.4rem);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.contact-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 44px;
}

.contact-grid {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 24px 28px;
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(222, 226, 230, 0.6);
  transition: var(--transition);
}

.contact-item:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
  border-color: rgba(74, 144, 217, 0.15);
}

.contact-icon {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(74, 144, 217, 0.12), rgba(173, 181, 189, 0.12));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--blue-500);
  font-size: 1.3rem;
  flex-shrink: 0;
  transition: var(--transition);
}

.contact-item:hover .contact-icon {
  transform: scale(1.1);
}

.contact-info {
  text-align: left;
}

.contact-label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.contact-value {
  font-size: 1.05rem;
  color: var(--text-primary);
  font-weight: 500;
  transition: var(--transition);
}

.contact-value:hover {
  color: var(--blue-500);
}

/* ========== 页脚 ========== */
.footer {
  background: linear-gradient(135deg, var(--silver-800), #1a1f2e);
  color: var(--silver-400);
  text-align: center;
  padding: 32px 20px;
  font-size: 0.85rem;
  position: relative;
  z-index: 1;
}

.footer p {
    margin-bottom: 8px;
}

.tech-support {
    font-size: 0.85rem !important;
    color: var(--text-muted) !important;
}

.tech-support a {
    color: var(--blue-400);
    transition: color 0.3s;
}

.tech-support a:hover {
    color: var(--blue-500);
    text-decoration: underline;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(74, 144, 217, 0.2), transparent);
}

/* ========== 滚动条 ========== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--silver-100); }
::-webkit-scrollbar-thumb { background: linear-gradient(180deg, var(--blue-300), var(--silver-300)); border-radius: 3px; }

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .profile-grid { grid-template-columns: repeat(2, 1fr); }
  .practice-layout { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .navbar { padding: 0 20px; }

  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(248, 249, 250, 0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 16px;
    gap: 4px;
    border-bottom: 1px solid var(--silver-200);
    transform: translateY(-150%);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-md);
  }

  .nav-links.open { transform: translateY(0); }
  .nav-toggle { display: flex; }

  .hero-name { font-size: 2.8rem; }
  .profile-grid { grid-template-columns: 1fr; }

  .section-title { font-size: 1.8rem; }
  .practice-card, .academic-card, .awards-section, .skills-section { padding: 22px; }
}

@media (max-width: 480px) {
  .hero-name { font-size: 2.2rem; }
  .hero-tags { flex-direction: column; align-items: center; }
  .card-images { flex-direction: column; }
  .cert-img { width: 100%; }
  .hobby-grid { flex-direction: column; }
  .contact-item { flex-direction: column; text-align: center; }
  .contact-info { text-align: center; }
  .section { padding: 80px 20px; }
}