/* Skills 区块样式升级 - 3D 地形背景 + 交互式技能图谱 */

.skills-section {
  position: relative;
  background: var(--ink-2);
  color: var(--text-light);
  padding: clamp(72px, 11vw, 140px) var(--gutter);
  overflow: hidden;
}

/* 地形背景 Canvas */
.terrain-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.7;
}

.skills-section .sec-inner {
  position: relative;
  z-index: 1;
}

/* 区块头部 */
.skills-header {
  margin-bottom: clamp(40px, 6vw, 64px);
}

.skills-header .sec-no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--steel);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.skills-header h2 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(38px, 5.5vw, 64px);
  line-height: 1.1;
  letter-spacing: -.02em;
  margin: 0;
}

.skills-header .subtitle {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--steel);
}

.skills-lead {
  margin-top: 16px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-light-2);
  max-width: 52ch;
}

/* 技能组网格 */
.skill-groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 48px 56px;
}

.skill-group {
  position: relative;
  padding: 24px;
  background: rgba(237, 232, 222, .02);
  border: 1px solid rgba(237, 232, 222, .08);
  border-radius: 2px;
  transition: border-color .3s, background .3s;
}

.skill-group:hover {
  background: rgba(237, 232, 222, .04);
  border-color: rgba(237, 232, 222, .14);
}

.skill-group::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 0;
  background: var(--gold);
  transition: height .35s var(--ease);
}

.skill-group:hover::before {
  height: 100%;
}

.skill-group h3 {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--steel);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--ink-line);
  margin-bottom: 18px;
  text-transform: uppercase;
}

.skill-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip {
  position: relative;
  min-height: 42px;
  padding: 0 18px;
  font-size: 14px;
  border: 1px solid var(--ink-line);
  border-radius: 21px;
  color: var(--text-light);
  background: rgba(11, 16, 21, .3);
  transition: border-color .25s, background .25s, color .25s, transform .2s var(--ease);
  cursor: pointer;
}

.chip::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: 21px;
  padding: 1px;
  background: linear-gradient(135deg, var(--gold) 0%, transparent 50%);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity .25s;
}

.chip:hover {
  border-color: var(--gold);
  background: rgba(223, 166, 106, .08);
  transform: translateY(-2px);
}

.chip:hover::before {
  opacity: 1;
}

.chip.is-on,
.chip[aria-pressed="true"] {
  border-color: var(--gold);
  color: var(--gold);
  background: rgba(223, 166, 106, .12);
}

.chip.is-pinned {
  border-color: var(--gold);
  color: var(--gold);
  background: rgba(223, 166, 106, .18);
  box-shadow: 0 0 0 3px rgba(223, 166, 106, .15);
}

.chip:active {
  transform: translateY(0);
}

/* 技能结果面板 */
.skill-result {
  margin-top: 56px;
  min-height: 96px;
  padding: 28px 32px;
  border: 1px solid var(--ink-line);
  background: rgba(11, 16, 21, .5);
  border-radius: 2px;
  font-size: 15px;
  color: var(--text-light-2);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.skill-result .lbl {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--steel);
  margin-right: 16px;
  margin-bottom: 12px;
}

.skill-result a,
.skill-result button {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  margin: 0 16px 8px 0;
  padding: 0 4px;
  border-bottom: 1px solid rgba(223, 166, 106, .6);
  color: var(--text-light);
  transition: color .2s, border-color .2s;
}

.skill-result a:hover,
.skill-result button:hover {
  color: var(--gold);
  border-color: var(--gold);
}

/* 响应式 */
@media (max-width: 820px) {
  .skill-groups {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .skill-group {
    padding: 20px;
  }

  .skill-result {
    padding: 20px 24px;
  }
}

/* 减少动态 */
.reduce-motion .chip,
.reduce-motion .skill-group,
.reduce-motion .skill-group::before {
  transition: none;
}