/* ==================== 智慧园区页面 (solution-smart-park.css) ==================== */
/* 依赖 base.css + pages.css · 仅页面独有组件 */

/* ==================== Architecture Stack ==================== */
.arch-stack { max-width: 860px; margin: 3rem auto 0; display: flex; flex-direction: column; gap: 1.25rem; }
.arch-layer { padding: 2rem 2.5rem; border-radius: 14px; transition: all .25s; position: relative; }
.arch-layer:hover { transform: translateY(-3px); }
.arch-layer--l0 { background: var(--white); border: 2px solid var(--gray-200); box-shadow: 0 4px 16px rgba(0,0,0,.04); }
.arch-layer--l1 { background: var(--white); border: 2px solid rgba(214,0,15,.15); box-shadow: 0 4px 16px rgba(214,0,15,.04); }
.arch-layer--l2 { background: var(--gray-50); border: 2px solid var(--gray-300); box-shadow: 0 4px 16px rgba(0,0,0,.04); }
.arch-layer__tag { font-size: .7rem; font-weight: 700; letter-spacing: .1em; padding: .2rem .6rem; border-radius: 4px; display: inline-block; margin-bottom: .8rem; }
.arch-layer--l0 .arch-layer__tag { background: var(--gray-50); color: var(--text-dark-soft); }
.arch-layer--l1 .arch-layer__tag { background: var(--primary-soft); color: var(--primary); }
.arch-layer--l2 .arch-layer__tag { background: var(--gray-100); color: var(--text-dark-soft); }
.arch-layer__title { font-size: 1.15rem; font-weight: 700; margin-bottom: .4rem; }
.arch-layer__desc { font-size: .88rem; line-height: 1.75; opacity: .8; }
.arch-layer__items { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1rem; }
.arch-layer__item { padding: .35rem .75rem; border-radius: 6px; font-size: .8rem; font-weight: 500; }
.arch-layer--l0 .arch-layer__item { background: var(--gray-50); color: var(--text-dark-soft); border: 1px solid var(--gray-100); }
.arch-layer--l1 .arch-layer__item { background: var(--primary-soft); color: var(--primary); border: 1px solid rgba(214,0,15,.12); }
.arch-layer--l2 .arch-layer__item { background: var(--gray-100); color: var(--text-dark-soft); border: 1px solid var(--gray-200); }

/* ==================== AI Assistants (simple) ==================== */
.ai-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; margin-top: 3rem; }
.ai-card { padding: 2rem 1.75rem; border-radius: 14px; background: var(--white); border: 1px solid var(--gray-200); transition: all .3s; }
.ai-card:hover { border-color: rgba(214,0,15,.15); box-shadow: 0 8px 32px rgba(214,0,15,.06); transform: translateY(-3px); }
.ai-card__icon { width: 44px; height: 44px; border-radius: 10px; display: flex; align-items: center; justify-content: center; margin-bottom: .8rem; }
.ai-card__name { font-size: 1rem; font-weight: 700; color: var(--text-dark); margin-bottom: .4rem; }
.ai-card__desc { font-size: .85rem; color: var(--text-dark-soft); line-height: 1.7; }
.ai-card__example { font-size: .8rem; color: var(--primary); margin-top: .8rem; padding: .5rem .75rem; background: var(--primary-soft); border-radius: 6px; }

/* ==================== Pre-requisites ==================== */
.prereq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; max-width: 800px; margin: 3rem auto 0; }
.prereq-card { padding: 2rem 1.75rem; border-radius: 12px; background: var(--white); border: 1px solid var(--gray-200); text-align: left; transition: all .25s; }
.prereq-card:hover { border-color: var(--primary); box-shadow: 0 8px 32px rgba(214,0,15,.06); transform: translateY(-3px); }
.prereq-card__tag { font-size: .72rem; font-weight: 700; letter-spacing: .1em; margin-bottom: .8rem; color: var(--primary); }
.prereq-card__title { font-size: 1.05rem; font-weight: 700; color: var(--text-dark); margin-bottom: .5rem; }
.prereq-card__desc { font-size: .85rem; color: var(--text-dark-soft); line-height: 1.75; }
.prereq-card__desc a { color: var(--primary); font-weight: 600; }
.prereq-card__desc a:hover { text-decoration: underline; }

/* ==================== Metrics (4-col) ==================== */
.metrics-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem; margin-top: 3rem; }
.metric-item { padding: 2rem 1.5rem; border-radius: 12px; background: var(--white); border: 1px solid var(--gray-200); text-align: center; transition: all .25s; }
.metric-item:hover { border-color: var(--primary); box-shadow: 0 8px 32px rgba(214,0,15,.06); transform: translateY(-3px); }
.metric-item__val { font-size: 2.2rem; font-weight: 700; font-family: 'DM Sans', sans-serif; color: var(--primary); line-height: 1; }
.metric-item__val span { font-size: .85rem; font-weight: 500; color: var(--text-dark-muted); }
.metric-item__label { font-size: .88rem; color: var(--text-dark); margin-top: .5rem; font-weight: 500; }
.metric-item__desc { font-size: .78rem; color: var(--text-dark-muted); margin-top: .35rem; }

/* ==================== Responsive ==================== */
@media (max-width: 768px) {
  .arch-layer { padding: 1.5rem 1.5rem; }
  .ai-grid { grid-template-columns: 1fr; }
  .prereq-grid { grid-template-columns: 1fr; }
  .metrics-row { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .metrics-row { grid-template-columns: 1fr; }
}