/* ===== 关于页样式 ===== */

/* 复用 list.css 的 page-banner */
.page-banner {
  height: 260px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.page-banner-bg {
  position: absolute; inset: 0;
  background-size: cover;
  background-position: center;
  transform: scale(1.05);
}
.page-banner-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to bottom, rgba(44,28,15,.5), rgba(139,26,26,.6));
}
.page-banner-content {
  position: relative; text-align: center; color: var(--white);
}
.page-banner-content h1 {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  letter-spacing: 6px;
  font-weight: 700;
  text-shadow: 0 2px 10px rgba(0,0,0,.4);
}
.page-banner-content p {
  font-family: var(--font-serif);
  letter-spacing: 4px;
  color: var(--gold-light);
  margin-bottom: .5rem;
}
.breadcrumb { background: transparent; padding: 0; }
.breadcrumb-item+.breadcrumb-item::before { color: rgba(255,255,255,.5); }

/* ===== 平台介绍 ===== */
.about-img-wrap {
  position: relative;
  display: inline-block;
  width: 100%;
}
.about-img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: 0 15px 40px rgba(0,0,0,.15);
  position: relative; z-index: 1;
}
.about-img-deco {
  position: absolute;
  top: 20px; left: -15px;
  width: 100%; height: 100%;
  border: 3px solid var(--gold);
  border-radius: var(--radius-lg);
  z-index: 0;
}
.about-text h3.about-subtitle {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  color: var(--primary);
  letter-spacing: 3px;
  margin-bottom: 1.2rem;
}
.about-text p {
  font-family: var(--font-serif);
  line-height: 2.1;
  color: var(--ink);
  font-size: .95rem;
  text-indent: 2em;
  margin-bottom: 1rem;
}

/* ===== 特色卡片 ===== */
.features-section { background: var(--paper-dark); }
.feature-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  border: 1px solid rgba(201,168,76,.2);
  transition: transform .3s, box-shadow .3s;
  height: 100%;
}
.feature-card:hover { transform: translateY(-6px); box-shadow: 0 12px 30px var(--shadow); }
.feature-icon {
  width: 64px; height: 64px;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 1.2rem;
  border: 3px solid var(--gold);
}
.feature-icon i { color: var(--gold-light); font-size: 1.6rem; }
.feature-card h5 {
  font-family: var(--font-serif);
  color: var(--primary);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: .8rem;
}
.feature-card p {
  font-family: var(--font-serif);
  font-size: .85rem;
  color: var(--ink-light);
  line-height: 1.8;
  margin: 0;
}

/* ===== 技术徽章 ===== */
.tech-badge {
  background: var(--white);
  border: 1px solid rgba(201,168,76,.3);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1rem;
  text-align: center;
  transition: all .3s;
}
.tech-badge:hover {
  border-color: var(--primary);
  box-shadow: 0 5px 20px var(--shadow);
  transform: translateY(-3px);
}
.tech-badge i { font-size: 2rem; color: var(--primary); display: block; margin-bottom: .5rem; }
.tech-badge span { font-family: var(--font-serif); font-size: .85rem; color: var(--ink); letter-spacing: 1px; }

/* ===== 联系表单 ===== */
.contact-section { background: var(--paper-dark); }
.contact-form-wrap {
  background: var(--white);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(201,168,76,.2);
  padding: 2.5rem;
  box-shadow: 0 8px 30px rgba(0,0,0,.06);
}
.form-label-custom {
  font-family: var(--font-serif);
  font-size: .88rem;
  color: var(--ink);
  display: block;
  margin-bottom: .4rem;
  letter-spacing: .5px;
}
.form-input-custom {
  width: 100%;
  border: 1.5px solid rgba(139,26,26,.2);
  border-radius: var(--radius);
  padding: .65rem 1rem;
  font-family: var(--font-serif);
  font-size: .9rem;
  color: var(--ink);
  background: var(--paper);
  transition: border-color .2s;
  outline: none;
}
.form-input-custom:focus { border-color: var(--primary); }
textarea.form-input-custom { resize: vertical; min-height: 120px; }
select.form-input-custom { cursor: pointer; }
.field-error {
  font-size: .78rem;
  color: #dc3545;
  font-family: var(--font-serif);
  margin-top: .3rem;
}
.btn-submit {
  display: inline-flex;
  align-items: center;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: var(--paper);
  border: none;
  border-radius: 25px;
  padding: .7rem 2.5rem;
  font-family: var(--font-serif);
  font-size: .95rem;
  letter-spacing: 2px;
  cursor: pointer;
  transition: all .3s;
  box-shadow: 0 4px 15px rgba(139,26,26,.3);
}
.btn-submit:hover { background: linear-gradient(135deg, var(--gold), var(--gold-light)); color: var(--ink); }
.alert-success-custom {
  background: rgba(123,160,91,.12);
  border: 1px solid var(--celadon);
  color: var(--celadon);
  border-radius: var(--radius);
  padding: .8rem 1.2rem;
  font-family: var(--font-serif);
  font-size: .9rem;
  margin-bottom: 1.2rem;
}

@media (max-width: 768px) {
  .about-img-deco { display: none; }
  .contact-form-wrap { padding: 1.5rem; }
}