/* 杜瑜杰个人简历 — 设计 token 与全局 */
:root {
  --color-bg: #fafafa;
  --color-bg-section: #fff;
  --color-text: #1a1a1a;
  --color-text-muted: #666;
  --color-border: #e5e5e5;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --font-sans: "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "SF Mono", Menlo, monospace;
  --space-unit: 8px;
  --space-xs: calc(var(--space-unit) * 1);
  --space-sm: calc(var(--space-unit) * 2);
  --space-md: calc(var(--space-unit) * 3);
  --space-lg: calc(var(--space-unit) * 5);
  --space-xl: calc(var(--space-unit) * 8);
  --space-2xl: calc(var(--space-unit) * 12);
  --radius: 6px;
  --transition: 0.2s ease;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

/* 布局 */
.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container-wide {
  max-width: 1000px;
}

.section {
  padding: var(--space-2xl) 0;
  background: var(--color-bg-section);
}

.section:nth-child(even) {
  background: var(--color-bg);
}

.section-title {
  margin: 0 0 var(--space-lg);
  font-size: 1.375rem;
  font-weight: 600;
  letter-spacing: -0.025em;
  color: var(--color-text);
}

/* 顶部导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
}

.brand {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.02em;
  transition: color var(--transition);
}

.brand:hover {
  color: var(--color-accent);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs);
}

.nav-link {
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
}

.nav-link:hover {
  color: var(--color-accent);
  background: rgba(37, 99, 235, 0.06);
}

/* Home Hero */
.section-hero {
  min-height: 88vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--space-2xl) 0 var(--space-xl);
}

.hero-content {
  opacity: 0;
  animation: fadeIn 0.5s ease 0.15s forwards;
}

.hero-inner {
  display: flex;
  align-items: center;
  gap: clamp(2rem, 5vw, 4rem);
}

.hero-left {
  flex: 1;
  min-width: 0;
}

.hero-welcome {
  margin: 0 0 var(--space-sm);
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.hero-title-wrap {
  margin: 0 0 var(--space-sm);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.25;
}

.hero-greeting {
  display: block;
  font-weight: 600;
  color: var(--color-text);
}

.hero-name {
  display: inline-block;
  margin: 2px 0 0;
  font-size: clamp(2rem, 6vw, 3rem);
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.hero-name-en {
  display: block;
  margin-top: 2px;
  font-size: 0.5em;
  font-weight: 500;
  color: var(--color-text-muted);
}

.hero-role {
  margin: 0 0 var(--space-md);
  font-size: 1rem;
  color: var(--color-text-muted);
}

.hero-tagline {
  margin: 0 0 var(--space-lg);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  max-width: 32em;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  cursor: pointer;
  border: none;
  font-family: inherit;
}

.btn-arrow {
  opacity: 0.9;
}

.btn-primary {
  color: #fff;
  background: var(--color-accent);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
}

.btn-secondary {
  color: var(--color-accent);
  background: transparent;
  border: 2px solid var(--color-accent);
}

.btn-secondary:hover {
  background: rgba(37, 99, 235, 0.06);
}

.hero-right {
  flex-shrink: 0;
}

.hero-avatar-wrap {
  position: relative;
  width: clamp(180px, 28vw, 260px);
  height: clamp(180px, 28vw, 260px);
}

.hero-avatar {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  overflow: hidden;
  background: linear-gradient(135deg, #e0e7ff 0%, #fce7f3 100%);
  box-shadow:
    0 0 0 4px rgba(255, 255, 255, 0.9),
    0 0 0 8px rgba(37, 99, 235, 0.12),
    0 12px 40px rgba(37, 99, 235, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
}

.hero-avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-avatar-initial {
  font-size: clamp(3rem, 8vw, 5rem);
  font-weight: 700;
  color: var(--color-accent);
  opacity: 0.9;
}

.hero-avatar-photo {
  position: absolute;
  right: -8%;
  bottom: -5%;
  width: 38%;
  height: auto;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 12px;
  border: 3px solid #fff;
  box-shadow: var(--shadow-md);
  z-index: 2;
}

.scroll-hint {
  margin-top: auto;
  padding-top: var(--space-xl);
  text-align: center;
}

.scroll-hint-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition);
}

.scroll-hint-link:hover {
  color: var(--color-accent);
}

.scroll-hint-arrow {
  font-size: 1rem;
  opacity: 0.8;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* About */
.about-basic {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.about-basic-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.9375rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.about-basic-item:hover {
  border-color: rgba(37, 99, 235, 0.25);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.06);
}

.about-basic-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  color: var(--color-accent);
  background: rgba(37, 99, 235, 0.08);
  border-radius: 10px;
}

.about-basic-icon svg {
  width: 20px;
  height: 20px;
}

.about-basic-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.about-basic-label {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

.about-basic-value {
  font-weight: 500;
  color: var(--color-text);
}

.about-sections {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.about-section h3 {
  margin: 0 0 var(--space-xs);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
}

.about-section p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* Education */
.education-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.education-card {
  padding: var(--space-lg);
  background: var(--color-bg);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.education-card h3 {
  margin: 0 0 var(--space-xs);
  font-size: 1.0625rem;
  font-weight: 600;
}

.education-meta {
  margin: 0 0 var(--space-md);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.education-courses-wrap {
  margin-top: var(--space-sm);
}

.education-courses-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0;
  font-size: 0.875rem;
  color: var(--color-accent);
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  transition: opacity var(--transition);
}

.education-courses-toggle:hover {
  opacity: 0.85;
}

.education-courses {
  margin: var(--space-sm) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: var(--space-xs);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.education-courses .course-item-more {
  display: none;
}

/* Awards — 时间轴 + 等级徽章 + 卡片 */
.awards-content {
  margin-top: var(--space-2xl);
}

.awards-showcase {
  position: relative;
  padding: var(--space-xl) 0 var(--space-xl) 14px;
}

.awards-showcase::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  border-radius: 4px;
  background: linear-gradient(180deg, var(--color-accent) 0%, rgba(37, 99, 235, 0.35) 100%);
  opacity: 0.95;
}

.awards-title {
  font-size: 1.25rem;
  margin-bottom: var(--space-lg);
  padding-left: var(--space-md);
}

.awards-groups {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.award-group {
  margin: 0;
}

.award-group-title {
  margin: 0 0 var(--space-md);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding-left: var(--space-md);
}

.award-cards {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.award-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-bg-section);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  border-left: 3px solid var(--color-accent);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-left-color 0.2s ease;
  animation: awardCardIn 0.5s ease backwards;
}

.award-card:hover {
  transform: translateX(4px);
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.1);
  border-left-color: var(--color-accent);
}

.award-card-year {
  flex-shrink: 0;
  min-width: 4.5em;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.02em;
}

.award-card-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-xs);
}

.award-card-name {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
}

.award-card-note {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  font-style: italic;
}

.award-badge {
  flex-shrink: 0;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 999px;
  letter-spacing: 0.02em;
}

.award-badge--gold {
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  color: #92400e;
  border: 1px solid #f59e0b;
}

.award-badge--silver {
  background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
  color: #475569;
  border: 1px solid #94a3b8;
}

.award-badge--blue {
  background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
  color: #1e40af;
  border: 1px solid var(--color-accent);
}

.award-badge--accent {
  background: rgba(37, 99, 235, 0.12);
  color: var(--color-accent);
  border: 1px solid rgba(37, 99, 235, 0.3);
}

.award-badge--muted {
  background: var(--color-bg);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

@keyframes awardCardIn {
  from {
    opacity: 0;
    transform: translateX(-12px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* 获奖证书图片展示 */
.awards-gallery {
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.awards-gallery .gallery-title {
  margin: 0 0 var(--space-md);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
}

.awards-gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-md);
  list-style: none;
  margin: 0;
  padding: 0;
}

.awards-gallery-grid .gallery-item {
  margin: 0;
}

.award-thumb {
  display: block;
  position: relative;
  aspect-ratio: 3 / 4;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.award-thumb:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.award-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.award-thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.2) 0%, transparent 40%);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

.award-thumb:hover::after {
  opacity: 1;
}

/* Lightbox 查看大图 */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.lightbox[hidden] {
  display: none !important;
}

.lightbox.is-open {
  opacity: 1;
  visibility: visible;
}


.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  cursor: pointer;
}

.lightbox-inner {
  position: relative;
  z-index: 1;
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-img {
  max-width: 100%;
  max-height: 85vh;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: var(--radius);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.lightbox-close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  z-index: 2;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  line-height: 1;
  color: #fff;
  background: rgba(255, 255, 255, 0.15);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: background var(--transition);
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.25);
}

/* Projects */
.projects-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.project-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg-section);
  overflow: hidden;
  transition: box-shadow var(--transition);
}

.project-card:hover {
  box-shadow: var(--shadow-sm);
}

.project-card-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  cursor: pointer;
  list-style: none;
  margin: 0;
}

.project-card-header::marker {
  display: none;
}

.project-card-title {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.project-type {
  font-size: 0.75rem;
  padding: 2px var(--space-xs);
  background: var(--color-bg);
  color: var(--color-text-muted);
  border-radius: 4px;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-left: auto;
}

.project-tag {
  font-size: 0.75rem;
  padding: 2px var(--space-xs);
  background: var(--color-bg);
  color: var(--color-text-muted);
  border-radius: 4px;
}

.project-card-body {
  padding: 0 var(--space-lg) var(--space-lg);
  display: none;
}

.project-card.is-open .project-card-body {
  display: block;
  animation: fadeIn 0.25s ease;
}

.project-card-body p,
.project-card-body dl {
  margin: 0 0 var(--space-sm);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.project-card-body dt {
  margin-top: var(--space-sm);
  font-weight: 600;
  font-size: 0.8125rem;
  color: var(--color-text);
}

.project-card-body dt:first-child {
  margin-top: 0;
}

.project-card-body dd {
  margin: 2px 0 0;
}

/* Skills */
.skills-categories {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.skill-category h4 {
  margin: 0 0 var(--space-sm);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
}

.skill-items {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.skill-item {
  font-size: 0.9375rem;
  color: var(--color-text);
}

.skill-item strong {
  font-weight: 500;
}

.skill-item-desc {
  display: block;
  margin-top: 2px;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  font-weight: normal;
}

/* Contact */
.contact-guide {
  margin: 0 0 var(--space-md);
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  font-size: 0.9375rem;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  transition: background var(--transition), border-color var(--transition);
  cursor: pointer;
  font-family: inherit;
}

.contact-link:hover {
  background: var(--color-border);
}

.contact-link.external:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.toast {
  position: fixed;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: var(--space-sm) var(--space-md);
  font-size: 0.875rem;
  color: #fff;
  background: var(--color-text);
  border-radius: var(--radius);
  opacity: 0;
  transition: transform 0.25s ease, opacity 0.25s ease;
  z-index: 20;
  pointer-events: none;
}

.toast.is-visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* Footer */
.site-footer {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.footer-text {
  margin: 0;
}

.back-top {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition);
}

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

/* 区块进入视口淡入 */
.section .container {
  opacity: 0;
  transform: translateY(10px);
}

.section.is-visible .container {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

/* 响应式 */
@media (max-width: 768px) {
  .hero-inner {
    flex-direction: column;
    text-align: center;
  }

  .hero-left {
    order: 1;
  }

  .hero-right {
    order: 0;
  }

  .hero-tagline {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-cta {
    justify-content: center;
  }
}

@media (max-width: 640px) {
  .header-inner {
    padding: var(--space-sm) var(--space-md);
  }

  .nav {
    padding: 0;
  }

  .nav-link {
    padding: var(--space-xs);
    font-size: 0.8125rem;
  }

  .section {
    padding: var(--space-xl) 0;
  }

  .about-basic {
    grid-template-columns: 1fr;
  }

  .section-hero {
    min-height: auto;
    padding: var(--space-xl) 0;
  }

  .hero-avatar-wrap {
    width: 160px;
    height: 160px;
  }

  .hero-cta {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .award-card {
    flex-wrap: wrap;
  }

  .award-badge {
    width: 100%;
    text-align: center;
    margin-top: var(--space-xs);
  }

  .awards-gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
  }

  .project-card-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .project-tags {
    margin-left: 0;
  }
}