/* ============================================
   黄瓜君 Personal Resume — Cyber Dark Theme
   ============================================ */

/* --- Design Tokens --- */
:root {
  /* Core Colors */
  --bg-primary: #0a0a0f;
  --bg-secondary: #121218;
  --bg-card: rgba(18, 18, 30, 0.75);
  --bg-card-hover: rgba(25, 25, 45, 0.85);

  /* Accent — Cucumber Green / Electric Cyan */
  --accent-green: #39ff14;
  --accent-cyan: #00e5ff;
  --accent-green-dim: rgba(57, 255, 20, 0.15);
  --accent-cyan-dim: rgba(0, 229, 255, 0.12);
  --accent-gradient: linear-gradient(135deg, #39ff14 0%, #00e5ff 100%);

  /* Text */
  --text-primary: #e8e8ec;
  --text-secondary: #9a9aae;
  --text-dim: #5c5c72;

  /* Glass */
  --glass-border: rgba(57, 255, 20, 0.12);
  --glass-border-hover: rgba(57, 255, 20, 0.3);
  --glass-backdrop: blur(18px);

  /* Spacing */
  --section-pad: clamp(60px, 10vw, 120px);
  --card-radius: 16px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb {
  background: var(--accent-green-dim);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(57, 255, 20, 0.35);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0 40px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(10, 10, 15, 0.7);
  backdrop-filter: var(--glass-backdrop);
  border-bottom: 1px solid var(--glass-border);
  transition: all 0.4s var(--ease-out);
}

.nav.scrolled {
  background: rgba(10, 10, 15, 0.92);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav__logo img {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 2px solid var(--accent-green);
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.3);
}

.nav__logo span {
  font-size: 1.1rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav__links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav__links a {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  position: relative;
  transition: color 0.3s var(--ease-out);
}

.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: width 0.3s var(--ease-out);
}

.nav__links a:hover {
  color: var(--accent-green);
}

.nav__links a:hover::after {
  width: 100%;
}

/* --- Particle Canvas --- */
#particle-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* --- Sections Common --- */
.section {
  position: relative;
  z-index: 1;
  padding: var(--section-pad) 40px;
  max-width: 1200px;
  margin: 0 auto;
}

.section__label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent-green);
  margin-bottom: 16px;
}

.section__label::before {
  content: '';
  width: 24px;
  height: 2px;
  background: var(--accent-gradient);
}

.section__title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 64px;
}

.hero__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  width: 100%;
  max-width: 1200px;
}

.hero__text {
  z-index: 1;
}

.hero__greeting {
  font-size: 1rem;
  font-weight: 500;
  color: var(--accent-cyan);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 12px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s var(--ease-out) 0.2s forwards;
}

.hero__name {
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 900;
  line-height: 1.05;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeUp 0.8s var(--ease-out) 0.4s forwards;
}

.hero__title {
  font-size: clamp(1.2rem, 2.5vw, 1.6rem);
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 28px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s var(--ease-out) 0.6s forwards;
}

.hero__desc {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-secondary);
  max-width: 540px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s var(--ease-out) 0.8s forwards;
}

.hero__desc p {
  margin-bottom: 14px;
}

.hero__desc strong {
  color: var(--accent-green);
  font-weight: 600;
}

.hero__visual {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  opacity: 0;
  transform: scale(0.85);
  animation: scaleIn 1s var(--ease-spring) 0.5s forwards;
}

.hero__avatar-wrapper {
  position: relative;
  width: 340px;
  height: 340px;
}

.hero__avatar {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 3px solid var(--accent-green);
  box-shadow:
    0 0 40px rgba(57, 255, 20, 0.2),
    0 0 80px rgba(57, 255, 20, 0.08),
    inset 0 0 40px rgba(57, 255, 20, 0.05);
}

.hero__avatar-ring {
  position: absolute;
  top: -12px;
  left: -12px;
  right: -12px;
  bottom: -12px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  animation: ringPulse 4s ease-in-out infinite;
}

.hero__avatar-ring:nth-child(3) {
  top: -24px;
  left: -24px;
  right: -24px;
  bottom: -24px;
  animation-delay: 1s;
  opacity: 0.5;
}

.hero__avatar-ring:nth-child(4) {
  top: -36px;
  left: -36px;
  right: -36px;
  bottom: -36px;
  animation-delay: 2s;
  opacity: 0.3;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 32px;
  padding: 14px 32px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--bg-primary);
  background: var(--accent-gradient);
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.3s var(--ease-out);
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s var(--ease-out) 1s forwards;
  text-decoration: none;
}

.hero__cta:hover {
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 8px 30px rgba(57, 255, 20, 0.3);
}

.hero__actions {
  display: flex;
  gap: 16px;
  margin-top: 32px;
  flex-wrap: wrap;
}

.hero__actions .hero__cta {
  margin-top: 0;
}

.hero__cta--secondary {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-backdrop);
}

.hero__cta--secondary:hover {
  border-color: var(--accent-green);
  color: var(--accent-green);
  box-shadow: 0 8px 30px rgba(57, 255, 20, 0.15);
}

.hero__cta svg {
  width: 18px;
  height: 18px;
  transition: transform 0.3s var(--ease-out);
}

.hero__cta:hover svg {
  transform: translateY(3px);
}

/* --- Skills Section --- */
.skills {
  padding-bottom: 40px;
}

.skills__categories {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
  justify-content: center;
}

.skills__cat-btn {
  padding: 8px 20px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.3s var(--ease-out);
  backdrop-filter: var(--glass-backdrop);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.skills__cat-btn:hover,
.skills__cat-btn.active {
  color: var(--accent-green);
  border-color: var(--accent-green);
  background: var(--accent-green-dim);
  box-shadow: 0 0 20px rgba(57, 255, 20, 0.1);
}

.skills__cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  padding: 40px 0;
  perspective: 800px;
}

.skill-tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  backdrop-filter: var(--glass-backdrop);
  cursor: default;
  transition: all 0.4s var(--ease-spring);
  position: relative;
  overflow: hidden;
}

.skill-tag::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(57, 255, 20, 0.06), transparent);
  transition: left 0.6s var(--ease-out);
}

.skill-tag:hover::before {
  left: 100%;
}

.skill-tag:hover {
  transform: translateY(-4px) scale(1.05);
  border-color: var(--glass-border-hover);
  box-shadow:
    0 8px 32px rgba(57, 255, 20, 0.12),
    0 0 0 1px rgba(57, 255, 20, 0.1);
}

.skill-tag img {
  width: 22px;
  height: 22px;
  border-radius: 4px;
}

.skill-tag__level {
  position: absolute;
  top: -40px;
  left: 50%;
  transform: translateX(-50%);
  padding: 4px 12px;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--bg-primary);
  background: var(--accent-green);
  border-radius: 6px;
  white-space: nowrap;
  opacity: 0;
  transition: all 0.3s var(--ease-spring);
  pointer-events: none;
}

.skill-tag:hover .skill-tag__level {
  top: -32px;
  opacity: 1;
}

/* --- Projects Section --- */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-top: 40px;
}

.project-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--card-radius);
  overflow: hidden;
  backdrop-filter: var(--glass-backdrop);
  transition: all 0.5s var(--ease-out);
  cursor: pointer;
}

.project-card:hover {
  border-color: var(--glass-border-hover);
  transform: translateY(-6px);
  box-shadow:
    0 20px 60px rgba(0, 0, 0, 0.5),
    0 0 40px rgba(57, 255, 20, 0.06);
}

.project-card__image {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-bottom: 1px solid var(--glass-border);
  transition: transform 0.6s var(--ease-out);
}

.project-card:hover .project-card__image {
  transform: scale(1.05);
}

.project-card__image-wrapper {
  overflow: hidden;
  position: relative;
}

.project-card__image-wrapper::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: linear-gradient(transparent, var(--bg-card));
  pointer-events: none;
}

.project-card__body {
  padding: 24px;
}

.project-card__number {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 8px;
}

.project-card__title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.35;
}

.project-card__desc {
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.project-card__tag {
  padding: 4px 12px;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent-green);
  background: var(--accent-green-dim);
  border-radius: 50px;
  letter-spacing: 0.3px;
}

/* Expanded Project Card (modal overlay) */
.project-card__expanded {
  display: none;
}

/* --- Footer --- */
.footer {
  position: relative;
  z-index: 1;
  padding: 40px;
  text-align: center;
  border-top: 1px solid var(--glass-border);
}

.footer__text {
  font-size: 0.82rem;
  color: var(--text-dim);
  letter-spacing: 0.5px;
}

.footer__text span {
  color: var(--accent-green);
}

/* --- Animations --- */
@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes ringPulse {
  0%, 100% {
    transform: scale(1);
    opacity: 0.3;
  }
  50% {
    transform: scale(1.04);
    opacity: 0.6;
  }
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

/* --- Scroll Reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.8s var(--ease-out);
}

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

/* --- Project Modal --- */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s var(--ease-out);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  max-width: 720px;
  width: 90%;
  max-height: 85vh;
  overflow-y: auto;
  transform: scale(0.9) translateY(20px);
  transition: transform 0.4s var(--ease-spring);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal__image {
  width: 100%;
  height: 280px;
  object-fit: cover;
  border-radius: 20px 20px 0 0;
}

.modal__content {
  padding: 32px;
}

.modal__title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.modal__desc {
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.modal__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.modal__close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: rgba(10, 10, 15, 0.8);
  color: var(--text-primary);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s var(--ease-out);
  backdrop-filter: var(--glass-backdrop);
}

.modal__close:hover {
  border-color: var(--accent-green);
  color: var(--accent-green);
}

/* --- Placeholder images (gradient fallback) --- */
.project-card__image--placeholder {
  width: 100%;
  height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  border-bottom: 1px solid var(--glass-border);
}
.project-card__image--placeholder.grad-1 {
  background: linear-gradient(135deg, #0d1117 0%, #1a3a1a 50%, #0a1a2a 100%);
}
.project-card__image--placeholder.grad-2 {
  background: linear-gradient(135deg, #0d1117 0%, #1a1a3a 50%, #2a0a2a 100%);
}
.project-card__image--placeholder.grad-3 {
  background: linear-gradient(135deg, #0d1117 0%, #3a2a1a 50%, #1a2a0a 100%);
}

/* --- Mobile Nav Toggle --- */
.nav__toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .hero__content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }

  .hero__visual {
    order: -1;
  }

  .hero__avatar-wrapper {
    width: 220px;
    height: 220px;
  }

  .hero__desc {
    margin: 0 auto;
  }

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

  .section {
    padding-left: 20px;
    padding-right: 20px;
  }

  .nav {
    padding: 0 20px;
  }

  .nav__links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: var(--glass-backdrop);
    padding: 20px;
    gap: 16px;
    border-bottom: 1px solid var(--glass-border);
  }

  .nav__links.open {
    display: flex;
  }

  .nav__toggle {
    display: block;
  }
}

@media (max-width: 480px) {
  .hero__name {
    font-size: 2.5rem;
  }

  .hero__avatar-wrapper {
    width: 180px;
    height: 180px;
  }

  .skills__cloud {
    gap: 10px;
  }

  .skill-tag {
    padding: 8px 16px;
    font-size: 0.8rem;
  }
}

/* --- WeChat QR Hover --- */
.wechat-hover-wrapper {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  color: var(--accent-green);
  font-weight: 600;
  transition: all 0.3s var(--ease-out);
}
.wechat-hover-wrapper:hover {
  text-shadow: 0 0 10px rgba(57, 255, 20, 0.4);
}
.wechat-hover-wrapper svg {
  width: 16px;
  height: 16px;
  opacity: 0.8;
  transition: transform 0.3s var(--ease-spring);
}
.wechat-hover-wrapper:hover svg {
  transform: scale(1.2) rotate(5deg);
  opacity: 1;
}
.wechat-qr-popup {
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(15px) scale(0.9);
  opacity: 0;
  pointer-events: none;
  background: var(--bg-card);
  border: 1px solid var(--accent-green);
  padding: 10px;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6), 0 0 20px rgba(57, 255, 20, 0.2);
  transition: all 0.4s var(--ease-spring);
  z-index: 100;
  margin-bottom: 12px;
  width: 180px;
  display: block;
}
.wechat-qr-popup::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border-width: 8px;
  border-style: solid;
  border-color: var(--accent-green) transparent transparent transparent;
}
.wechat-hover-wrapper:hover .wechat-qr-popup {
  opacity: 1;
  pointer-events: all;
  transform: translateX(-50%) translateY(0) scale(1);
}
.wechat-qr-popup img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  display: block;
}