/* about.css (refined) */
:root {
  --card-bg: rgba(255, 255, 255, 0.8);
  --radius: 14px
}

.about-main {
  padding: 80px 5% 80px
}

.about-grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 28px;
  max-width: 1200px;
  margin: 0 auto
}

@media(max-width:1024px) {
  .about-grid {
    grid-template-columns: minmax(280px, 320px) 1fr;
    gap: 24px
  }

  .about-main {
    padding: 70px 4% 70px
  }

  .portrait-frame {
    width: min(300px, 30vw);
    height: min(300px, 30vw)
  }
}

.portrait-frame {
  width: 320px;
  height: 320px;
  max-width: 100%;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid rgba(0, 0, 0, 0.05);
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.1);
  position: relative;
  aspect-ratio: 1
}

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

.portrait-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(120deg, rgba(255, 102, 0, 0.08), rgba(255, 140, 0, 0.08));
  mix-blend-mode: overlay;
  clip-path: polygon(10% 0, 90% 0, 100% 30%, 75% 90%, 25% 100%, 0 70%);
  opacity: 0.95
}

.portrait-tag {
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 8px 12px;
  border-radius: 8px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  color: #fff;
  font-weight: 900
}

.quick-links {
  display: flex;
  gap: 10px;
  margin-top: 12px;
  flex-wrap: wrap
}

.quick-btn {
  display: inline-block;
  padding: 10px 12px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--secondary), var(--primary));
  color: #fff;
  font-weight: 800;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 15px rgba(255, 102, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.2);
  border: none
}

.quick-btn:hover {
  opacity: 1;
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 8px 30px rgba(255, 102, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.3)
}

.quick-btn:focus {
  outline: 2px solid var(--secondary);
  outline-offset: 2px
}

.quick-btn.outline {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
  box-shadow: none
}

.quick-btn.outline:hover {
  background: rgba(255, 102, 0, 0.05);
  box-shadow: 0 8px 30px rgba(255, 102, 0, 0.2);
  transform: translateY(-3px) scale(1.05)
}

.about-card.card {
  padding: 22px;
  border-radius: var(--radius);
  background: var(--card-bg);
  border: 1px solid rgba(0, 0, 0, 0.05);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.05)
}

.card-header .title {
  font-size: 1.25rem;
  font-weight: 900;
  margin-bottom: 4px;
  color: transparent;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text
}

.card-header .subtitle {
  color: var(--muted);
  margin-bottom: 10px;
  font-weight: 700
}

.card-body {
  margin-top: 12px
}

.lead {
  color: var(--text);
  line-height: 1.6;
  margin-bottom: 12px;
  opacity: 0.9
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 12px
}

.contact-grid .muted {
  color: var(--muted);
  font-weight: 600;
  margin-top: 4px
}

.sep {
  border: none;
  height: 1px;
  background: rgba(0, 0, 0, 0.1);
  margin: 12px 0
}

.section-heading {
  color: var(--primary);
  margin-top: 8px;
  margin-bottom: 8px;
  font-weight: 900;
  font-size: 1rem
}

.edu-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 10px
}

.edu-item h4 {
  margin: 0;
  font-size: 1rem;
  color: var(--text);
  font-weight: 800
}

.edu-item .muted {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.5
}

.edu-item ul {
  margin: 8px 0;
  padding-left: 20px
}

.edu-item ul li {
  margin-bottom: 6px;
  line-height: 1.5;
  color: var(--muted)
}

.cert-list {
  margin: 0;
  padding-left: 20px;
  color: var(--text);
  opacity: 0.9
}

.cert-list li {
  margin-bottom: 8px;
  line-height: 1.4
}

.cert-link {
  color: var(--secondary);
  margin-left: 8px;
  text-decoration: underline
}

.highlights p {
  color: var(--text);
  line-height: 1.6;
  margin-top: 8px;
  opacity: 0.9
}

@media(max-width:980px) {
  .about-main {
    padding: 60px 4% 60px
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 28px
  }

  .portrait-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%
  }

  .portrait-frame {
    width: min(280px, 50vw);
    height: min(280px, 50vw);
    max-width: 100%;
    aspect-ratio: 1
  }

  .quick-links {
    justify-content: center;
    margin-top: 20px;
    width: 100%;
    max-width: 500px;
    flex-wrap: wrap
  }

  .quick-btn {
    min-height: 44px;
    flex: 1;
    min-width: 140px;
    max-width: 200px
  }
}

@media(max-width:768px) {
  .about-main {
    padding: 50px 3% 50px
  }

  .portrait-frame {
    width: 240px;
    height: 240px
  }

  .about-card.card {
    padding: 20px
  }

  .card-header .title {
    font-size: 1.15rem
  }

  .card-header .subtitle {
    font-size: 0.9rem
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 12px
  }

  .quick-links {
    gap: 10px
  }

  .quick-btn {
    padding: 12px 16px;
    font-size: 0.9rem
  }
}

@media(max-width:480px) {
  .about-main {
    padding: 40px 3% 40px
  }

  .portrait-frame {
    width: min(200px, 70vw);
    height: min(200px, 70vw);
    aspect-ratio: 1
  }

  .portrait-tag {
    font-size: 0.8rem;
    padding: 6px 10px;
    left: 8px;
    bottom: 8px
  }

  .quick-links {
    flex-direction: column;
    width: 100%;
    gap: 10px;
    max-width: 100%
  }

  .quick-btn {
    width: 100%;
    text-align: center;
    padding: 12px 16px;
    min-height: 48px;
    font-size: 0.9rem
  }

  .about-card.card {
    padding: 18px
  }

  .card-header .title {
    font-size: 1.05rem
  }

  .card-header .subtitle {
    font-size: 0.85rem
  }

  .lead {
    font-size: 0.9rem;
    line-height: 1.6
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 10px
  }

  .contact-grid>div {
    padding: 10px
  }

  .section-heading {
    font-size: 0.9rem;
    margin-top: 12px
  }

  .edu-item h4 {
    font-size: 0.9rem;
    line-height: 1.4
  }

  .edu-item .muted {
    font-size: 0.85rem
  }

  .cert-list {
    font-size: 0.9rem;
    padding-left: 18px
  }

  .cert-list li {
    margin-bottom: 10px;
    line-height: 1.5
  }
}

@media(max-width:360px) {
  .about-main {
    padding: 30px 2% 30px
  }

  .portrait-frame {
    width: min(180px, 75vw);
    height: min(180px, 75vw)
  }

  .about-card.card {
    padding: 16px
  }

  .card-header .title {
    font-size: 1rem
  }
}