:root {
  --sidebar-bg: #0f2e52;
  --sidebar-text: #a0b8d8;
  --sidebar-active: #ffffff;
  --accent: #e0b83d;
  --accent2: #c9a02a;
  --accent3: #f0d04a;
  --accent4: #b09028;
  --card-bg: rgba(240,245,252,0.85);
  --block-bg: rgba(230,240,250,0.65);
  --tag-bg: rgba(224,184,61,0.14);
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
  --shadow-hover: 0 8px 30px rgba(0,0,0,0.15);
  --radius: 12px;
  --sidebar-width: 280px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; height: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: #2c2c2c;
  line-height: 1.7;
  height: 100%;
  overflow: hidden;
  background: #0c2340;
}

/* ===== Background Slideshow ===== */
.bg-slideshow {
  position: fixed;
  top: 0; left: var(--sidebar-width); right: 0; bottom: 0;
  z-index: 0;
}

.bg-slideshow .bg-img {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transition: opacity 1.5s ease-in-out;
  filter: blur(1px) brightness(0.92) saturate(0.95);
}

.bg-slideshow .bg-img.show { opacity: 0.3; }

.bg-slideshow::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(10,25,50,0.10);
  pointer-events: none;
}

/* ===== Sidebar ===== */
.sidebar {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  display: flex;
  flex-direction: column;
  padding: 40px 30px;
  z-index: 100;
  overflow-y: auto;
  scrollbar-width: none;
}

.sidebar::-webkit-scrollbar { width: 0; height: 0; display: none; }

.sidebar-header { margin-bottom: 36px; }

.sidebar-header .name {
  font-size: 26px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 2px;
}

.sidebar-header .subtitle {
  font-size: 13px;
  color: var(--sidebar-text);
  margin-top: 6px;
  line-height: 1.5;
}

.sidebar-header .badge {
  display: inline-block;
  margin-top: 12px;
  padding: 4px 12px;
  font-size: 12px;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 20px;
  letter-spacing: 1px;
}

.sidebar-header .contact {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.sidebar-header .contact a {
  font-size: 15px;
  color: #a0b5cc;
  text-decoration: none;
  transition: color 0.2s;
  display: flex;
  align-items: center;
  gap: 8px;
}

.sidebar-header .contact a:hover { color: #ffffff; }

.sidebar-header .contact .icon {
  width: 18px;
  text-align: center;
  font-size: 15px;
}

.nav-section { margin-bottom: 24px; }

.nav-section-title {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: #5a7a9a;
  margin-bottom: 10px;
  padding-left: 4px;
}

.nav-list { list-style: none; }
.nav-list li { margin-bottom: 2px; }

.nav-list a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--sidebar-text);
  text-decoration: none;
  border-radius: 6px;
  transition: all 0.2s;
}

.nav-list a:hover { color: #ffffff; background: rgba(255,255,255,0.08); }

.nav-list a.active {
  color: var(--sidebar-active);
  background: rgba(224,184,61,0.22);
  font-weight: 600;
}

.nav-list a.sub { padding-left: 24px; font-size: 13px; }

.sidebar-footer {
  margin-top: auto;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.08);
  font-size: 12px;
  color: #666;
}

.sidebar-footer a { color: var(--accent); text-decoration: none; }
.sidebar-footer a:hover { text-decoration: underline; }

/* ===== Main Content ===== */
.main {
  position: fixed;
  top: 0; left: var(--sidebar-width); right: 0; bottom: 0;
  overflow-y: overlay;
  overflow-x: hidden;
  padding: 48px 52px 48px 52px;
  z-index: 1;
}

/* Completely hide scrollbar */
.main { scrollbar-width: none; }
.main::-webkit-scrollbar { width: 0; height: 0; display: none; }

.section {
  margin-bottom: 64px;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.section.visible { opacity: 1; transform: translateY(0); }

.section-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: 1px;
  color: #e8e8e8;
}

.section-divider {
  width: 48px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
  margin-bottom: 32px;
}

/* ===== Hero Card ===== */
.hero-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 36px 40px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.hero-card .intro { font-size: 15px; color: #4a5568; margin-bottom: 20px; line-height: 1.8; }

.skill-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 24px; }

.skill-block h4 {
  font-size: 14px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: 1px;
}

.skill-block h4 .dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
}

.skill-block ul { list-style: none; font-size: 14px; color: #5a6a7a; line-height: 2; }
.skill-block ul li::before { content: "▸ "; color: var(--accent); font-size: 10px; }

/* ===== Project Card ===== */
.project-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 32px;
  overflow: hidden;
  transition: box-shadow 0.3s;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

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

.project-header { padding: 28px 32px 0; }

.project-header h3 { font-size: 21px; font-weight: 700; margin-bottom: 6px; }

.project-header h3 .icon { margin-right: 6px; }

.project-header .project-subtitle {
  font-size: 16px;
  font-weight: 500;
  color: #4a5568;
  margin-bottom: 12px;
  line-height: 1.5;
}

.project-header .project-subtitle .sep { color: #bbb; margin: 0 6px; }

.project-body { display: flex; gap: 32px; padding: 20px 32px 32px; align-items: flex-start; }

/* ===== Gallery ===== */
.project-gallery { flex-shrink: 0; width: 300px; }

.gallery-main {
  width: 300px; height: 300px;
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  margin-bottom: 10px;
  background: #f2f6fb;
  position: relative;
}

.gallery-main img {
  width: 100%; height: 100%;
  object-fit: contain;
  transition: opacity 0.5s ease;
  position: absolute;
  top: 0; left: 0;
  opacity: 0;
}

.gallery-main img.show { opacity: 1; position: relative; }
.gallery-main:hover img.show { transform: scale(1.03); }

.gallery-thumbs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.gallery-thumbs::-webkit-scrollbar { height: 4px; }
.gallery-thumbs::-webkit-scrollbar-thumb { background: #ccc; border-radius: 2px; }

.gallery-thumbs img {
  width: 56px; height: 56px;
  object-fit: contain;
  border-radius: 6px;
  cursor: pointer;
  border: 2px solid transparent;
  transition: border-color 0.2s;
  flex-shrink: 0;
  background: #f2f6fb;
}

.gallery-thumbs img.active { border-color: var(--accent); }

/* ===== Project Text ===== */
.project-desc { flex: 1; font-size: 14px; color: #333; line-height: 1.9; }

.project-desc .highlight {
  font-size: 15px;
  font-weight: 600;
  color: #8f6f15;
  margin-bottom: 14px;
  padding: 10px 14px;
  background: rgba(201,162,39,0.10);
  border-radius: 8px;
  border-left: 3px solid var(--accent);
}

/* Detail sub-cards */
.detail-block {
  background: var(--block-bg);
  border-radius: 8px;
  padding: 14px 16px;
  margin-bottom: 12px;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border-left: 3px solid transparent;
}

.detail-block.c1 { border-left-color: var(--accent); }
.detail-block.c2 { border-left-color: var(--accent2); }
.detail-block.c3 { border-left-color: var(--accent3); }
.detail-block.c4 { border-left-color: var(--accent4); }

.detail-block h5 {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 4px;
  color: #1a1a1a;
}

.detail-block ul { margin: 4px 0 0 14px; list-style: none; }
.detail-block ul li { font-size: 13px; color: #4a5568; line-height: 1.8; }
.detail-block ul li::before { content: "▹ "; color: var(--accent); font-size: 10px; }

.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }

.tag {
  font-size: 12px;
  padding: 4px 12px;
  background: var(--tag-bg);
  border-radius: 20px;
  color: #555;
  letter-spacing: 1px;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.project-links { display: flex; gap: 16px; margin-top: 16px; }

.project-links a {
  font-size: 13px;
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.project-links a:hover { color: #a88a2a; text-decoration: underline; }

/* ===== Image Modal ===== */
.modal {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.85);
  z-index: 999;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.modal.show { display: flex; }

.modal img {
  max-width: 90vw;
  max-height: 90vh;
  border-radius: 8px;
  cursor: default;
  transition: opacity 0.3s ease;
}

.modal-close {
  position: fixed;
  top: 24px; right: 32px;
  font-size: 32px;
  color: #fff;
  cursor: pointer;
  z-index: 1000;
  opacity: 0.7;
  transition: opacity 0.2s;
}

.modal-close:hover { opacity: 1; }

/* ===== Responsive ===== */
@media (max-width: 800px) {
  body { flex-direction: column; overflow: auto; }
  .sidebar { position: relative; width: 100%; padding: 24px 20px; }
  .main { position: relative; left: 0; }
  .bg-slideshow { left: 0; }
  .project-body { flex-direction: column; }
  .project-gallery { width: 100%; }
  .gallery-main { width: 100%; height: 250px; }
  .skill-grid { grid-template-columns: 1fr; }
}