.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 44px; padding: 0 18px; border-radius: var(--radius-button);
  border: 1px solid var(--color-line); color: var(--color-text);
  background: rgba(255,255,255,0.05);
  transition: transform var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}
.btn:hover { transform: translateY(-2px); border-color: rgba(101,240,196,0.5); background: rgba(101,240,196,0.08); }
.btn.primary { background: linear-gradient(135deg, var(--color-accent), var(--color-accent-2)); color: #061016; border-color: transparent; font-weight: 800; }
.btn.ghost { background: transparent; }

.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 0; }
.tag { font-size: 0.76rem; color: var(--color-muted); border: 1px solid var(--color-line); padding: 7px 10px; border-radius: 999px; background: rgba(255,255,255,0.035); }
.status-pill { display: inline-flex; color: #071016; background: var(--color-accent); font-weight: 800; font-size: 0.76rem; padding: 7px 11px; border-radius: 999px; }

.feature-card {
  display: grid; grid-template-columns: 1fr 0.86fr; gap: 26px; align-items: stretch;
  border: 1px solid var(--color-line); border-radius: var(--radius-xl);
  background: linear-gradient(135deg, rgba(255,255,255,0.07), rgba(255,255,255,0.025));
  overflow: hidden; box-shadow: var(--shadow-card);
}
.feature-card:nth-child(even) { grid-template-columns: 0.86fr 1fr; }
.feature-card:nth-child(even) .feature-media { order: 2; }
.feature-media { position: relative; min-height: 350px; overflow: hidden; background: var(--color-surface-2); }
.feature-media img { width: 100%; height: 100%; object-fit: cover; transition: transform 700ms ease; }
.feature-card:hover .feature-media img { transform: scale(1.06); }
.feature-media::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent, rgba(7,10,18,0.78)); opacity: 0.85; }
.feature-overlay { position: absolute; left: 22px; right: 22px; bottom: 22px; z-index: 2; display: flex; justify-content: space-between; gap: 16px; align-items: flex-end; }
.feature-number { color: rgba(255,255,255,0.54); font-weight: 900; font-size: 3.1rem; letter-spacing: -0.08em; }
.feature-body { padding: 34px; display: flex; flex-direction: column; justify-content: center; }
.feature-body h3 { font-size: clamp(2rem, 4vw, 3.4rem); letter-spacing: -0.06em; line-height: 0.98; margin: 16px 0 14px; }
.feature-body p { color: var(--color-muted); line-height: 1.7; font-size: 1rem; }
.card-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }

.feature-card--simple,
.feature-card--simple:nth-child(even) {
  grid-template-columns: 1fr;
}

.feature-card--simple .feature-body {
  padding: 38px;
}

.feature-card--simple .feature-body h3 {
  margin-top: 0;
}

.feature-card--simple .card-actions {
  margin-top: 24px;
}

.tool-card {
  min-height: 360px; display: flex; flex-direction: column;
  border: 1px solid var(--color-line); border-radius: var(--radius-lg); overflow: hidden;
  background: rgba(255,255,255,0.045);
  transition: transform var(--transition-normal), border-color var(--transition-normal), background var(--transition-normal);
}
.tool-card:hover { transform: translateY(-8px); border-color: rgba(126,167,255,0.45); background: rgba(255,255,255,0.065); }
.tool-thumb { height: 165px; overflow: hidden; background: var(--color-surface); }
.tool-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 700ms ease; }
.tool-card:hover img { transform: scale(1.06); }
.tool-body { padding: 22px; display: flex; flex-direction: column; flex: 1; }
.tool-body h3 { font-size: 1.45rem; letter-spacing: -0.04em; margin: 12px 0 10px; }
.tool-body p { color: var(--color-muted); line-height: 1.65; margin: 0; }
.tool-body .card-actions { margin-top: auto; padding-top: 22px; }

.info-card { border: 1px solid var(--color-line); border-radius: var(--radius-lg); padding: 26px; background: rgba(255,255,255,0.045); }
.info-card h3 { margin: 0 0 12px; font-size: 1.35rem; letter-spacing: -0.035em; }
.info-card p, .info-card li { color: var(--color-muted); line-height: 1.7; }
.info-card ul { padding-left: 18px; margin: 10px 0 0; }
.cover-box { border: 1px solid var(--color-line); border-radius: var(--radius-xl); overflow: hidden; background: var(--color-surface); box-shadow: var(--shadow-card); }
.cover-box img { width: 100%; min-height: 340px; object-fit: cover; }
.back-link { color: var(--color-muted); display: inline-flex; margin-bottom: 24px; }
.back-link:hover { color: var(--color-text); }

@media (max-width: 900px) {
  .feature-card, .feature-card:nth-child(even) { grid-template-columns: 1fr; }
  .feature-card:nth-child(even) .feature-media { order: 0; }
  .feature-media { min-height: 260px; }
}


.personal-page {
  padding-bottom: 4rem;
}

.personal-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 1.5rem;
  align-items: start;
  margin-top: 1.5rem;
}

.personal-hero-text {
  max-width: 820px;
}

.personal-summary-card {
  position: sticky;
  top: 96px;
}

.personal-section {
  margin-top: 3.5rem;
}

.personal-text-block {
  max-width: 900px;
}

.personal-text-block p {
  color: var(--color-muted);
  font-size: 1.05rem;
  line-height: 1.8;
}

.small-title {
  font-size: clamp(1.8rem, 3vw, 2.7rem);
  margin-bottom: 1rem;
}

.education-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.education-card {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.education-card-head {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.education-code {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 64px;
  height: 64px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: var(--surface-soft);
  color: var(--accent);
  font-weight: 800;
  letter-spacing: 0.08em;
}

.education-card h3 {
  margin: 0;
}

.education-card-head p {
  margin: 0.25rem 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.teaching-highlight {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
}

.teaching-highlight h2 {
  margin: 0.5rem 0 0;
  font-size: clamp(1.6rem, 2.5vw, 2.3rem);
}

.personal-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

@media (max-width: 900px) {
  .personal-hero,
  .teaching-highlight {
    grid-template-columns: 1fr;
  }

  .personal-summary-card {
    position: static;
  }

  .education-grid,
  .personal-card-grid {
    grid-template-columns: 1fr;
  }
}

.teaching-section {
  margin-top: 4rem;
}

.teaching-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: 1rem;
  margin-top: 1.5rem;
  align-items: start;
}

.teaching-main-card {
  min-height: 100%;
}

.teaching-main-card p {
  font-size: 1.03rem;
  line-height: 1.8;
}

.teaching-points {
  display: grid;
  gap: 1rem;
}

.teaching-points .info-card h3 {
  margin-bottom: 0.5rem;
}

@media (max-width: 900px) {
  .teaching-layout {
    grid-template-columns: 1fr;
  }
}