/* tiku.html 专属布局 */

.hero-tiku { position: relative; overflow: hidden; background: var(--paper-2); }
.hero-wrap { display: grid; grid-template-columns: 0.95fr 1.05fr; gap: 40px; align-items: center; padding-top: 96px; padding-bottom: 70px; }
.hero-text h1 { font-size: 40px; line-height: 1.25; color: var(--ink-900); margin: 14px 0 18px; }
.hero-media img { width: 100%; height: auto; border-radius: 16px; box-shadow: 0 18px 40px rgba(21,50,56,.16); }
.ph-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 10px; }
.ph-bg { position: absolute; inset: auto 0 0 0; height: 220px; pointer-events: none; }
.ph-bg svg { width: 100%; height: 100%; display: block; }

.split { line-height: 0; font-size: 0; overflow: hidden; }
.split svg { display: block; width: 100%; height: 56px; }

/* 科目 */
.subj { margin-top: 24px; }
.subj .card { padding: 24px; }
.subj h3 { margin: 12px 0 10px; color: var(--ink-900); }
.subj p { color: var(--ink-500); line-height: 1.85; margin: 0; }

.media-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 26px; }
.media-row.single { grid-template-columns: 1fr; max-width: 760px; margin-left: auto; margin-right: auto; }
.media-row img { width: 100%; height: auto; border-radius: 14px; }

/* 练习方式 */
.mode { margin-top: 24px; }
.mode .card { padding: 24px; }
.mode h3 { margin: 0 0 10px; color: var(--ink-900); }
.mode p { color: var(--ink-500); line-height: 1.8; margin: 0; }

/* 题型示例 */
.qtype { margin-top: 24px; }
.qtype .card { padding: 22px; }
.qtype h3 { margin: 12px 0 10px; color: var(--ink-900); font-size: 17px; line-height: 1.5; }
.qtype p { color: var(--ink-500); line-height: 1.8; margin: 0; }

/* 错题整理 */
.err-box { max-width: 820px; margin: 22px auto 0; }
.err-list { margin: 0; padding-left: 0; list-style: none; counter-reset: err; }
.err-list li { counter-increment: err; position: relative; padding: 16px 18px 16px 58px; background: #fff; border-radius: 12px; margin-bottom: 12px; color: var(--ink-500); line-height: 1.8; }
.err-list li::before { content: counter(err); position: absolute; left: 16px; top: 16px; width: 28px; height: 28px; border-radius: 50%; background: var(--green-100); color: var(--green-500); display: flex; align-items: center; justify-content: center; font-weight: 700; }

/* 刷题计划条 */
.plan-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 24px; }
.plan-item { background: #fff; border-radius: 12px; padding: 20px; border-top: 4px solid var(--green-500); }
.plan-item:nth-child(2) { border-top-color: var(--blue-500); }
.plan-item:nth-child(3) { border-top-color: var(--yellow-400); }
.plan-item:nth-child(4) { border-top-color: var(--ink-700); }
.plan-wk { display: inline-block; font-weight: 700; color: var(--ink-900); margin-bottom: 8px; }
.plan-item p { color: var(--ink-500); line-height: 1.8; margin: 0; font-size: 14px; }

/* 相关推荐 */
.rel-links { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 18px; }
.rel-links a { padding: 10px 18px; border-radius: 999px; background: #fff; border: 1px solid var(--blue-100); color: var(--ink-700); font-size: 14px; transition: all .2s ease; }
.rel-links a:hover { background: var(--blue-50); border-color: var(--blue-500); color: var(--blue-500); }

@media (max-width: 768px) {
  .hero-wrap { grid-template-columns: 1fr; gap: 26px; padding-top: 84px; }
  .hero-text h1 { font-size: 30px; }
  .media-row { grid-template-columns: 1fr; }
  .plan-strip { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .hero-text h1 { font-size: 25px; }
  .split svg { height: 38px; }
  .ph-bg { height: 130px; }
  .plan-strip { grid-template-columns: 1fr; }
}