/* ============================================================
   功能特性页 — 霓虹翠绿赛博 · Neon Emerald Cyber
   独特配色：暗夜黑 → 霓虹绿 → 青柠色
   大图标 + Tab切换 + 渐变边框
   ============================================================ */

.features-page {
  --f-bg: #0a0f0a;
  --f-surface: #0e170e;
  --f-card: #121c14;
  --f-neon: #00ff88;
  --f-lime: #a8ff3e;
  --f-teal: #00e5a0;
  --f-warn: #ffb800;
  --f-text: #9aada0;
  --f-title: #e0ffe8;
  --f-border: rgba(0,255,136,.12);
  --f-glow: rgba(0,255,136,.2);
  background: var(--f-bg);
  font-family: 'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;
}

/* ---------- 全页面扫描线效果 ---------- */
.features-page::before {
  content: '';
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    0deg, transparent, transparent 2px,
    rgba(0,255,136,.012) 2px, rgba(0,255,136,.012) 4px
  );
  pointer-events: none;
  z-index: 9999;
}

/* ---------- Hero ---------- */
.ft-hero {
  padding: 120px 20px 60px;
  text-align: center;
  position: relative;
}
.ft-hero::after {
  content: '';
  position: absolute;
  bottom: 0; left: 50%; transform: translateX(-50%);
  width: 600px; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,255,136,.3), transparent);
}
.ft-hero__chip {
  display: inline-block;
  margin-bottom: 20px;
  padding: 5px 18px;
  font-family: 'Fira Code', monospace;
  font-size: 12px;
  letter-spacing: .15em;
  color: #00ff88;
  border: 1px solid rgba(0,255,136,.3);
  border-radius: 2px;
  background: rgba(0,255,136,.05);
}
.ft-hero__title {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 900;
  color: var(--f-title);
  margin-bottom: 14px;
  text-shadow: 0 0 60px rgba(0,255,136,.15);
}
.ft-hero__title em {
  font-style: normal;
  color: var(--f-neon);
  text-shadow: 0 0 30px rgba(0,255,136,.4);
}
.ft-hero__desc {
  font-size: 17px;
  color: #6a8a70;
  max-width: 560px;
  margin: 0 auto;
}

/* ---------- Tab导航 — 横向不等宽 ---------- */
.ft-tabs {
  max-width: 1200px;
  margin: 0 auto 20px;
  padding: 0 20px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2px;
}
.ft-tab-btn {
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 700;
  color: #5a7a60;
  background: transparent;
  border: 1px solid transparent;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all .3s;
  font-family: 'Fira Code', monospace;
  letter-spacing: .05em;
  position: relative;
}
.ft-tab-btn:hover { color: #a0ffc0; }
.ft-tab-btn--active {
  color: var(--f-neon);
  border-bottom-color: var(--f-neon);
  text-shadow: 0 0 20px rgba(0,255,136,.5);
}

/* ---------- Tab内容区 ---------- */
.ft-tab-contents {
  max-width: 1100px;
  margin: 0 auto 80px;
  padding: 0 20px;
}
.ft-tab-content {
  display: none;
  animation: ftFadeIn .4s ease;
}
.ft-tab-content--active { display: block; }
@keyframes ftFadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.ft-detail {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  align-items: start;
  padding: 48px 40px;
  background: var(--f-card);
  border: 1px solid var(--f-border);
  border-radius: 16px;
  position: relative;
  overflow: hidden;
}
.ft-detail::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--f-neon), var(--f-teal));
  border-radius: 4px 0 0 4px;
}
@media (max-width: 768px) {
  .ft-detail { grid-template-columns: 1fr; gap: 28px; padding: 32px 24px; }
}

/* 左侧大图标区 */
.ft-detail__icon-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}
.ft-detail__icon {
  width: 140px;
  height: 140px;
  border-radius: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 72px;
  background: linear-gradient(135deg, rgba(0,255,136,.12), rgba(0,229,160,.04));
  border: 2px solid rgba(0,255,136,.2);
  box-shadow: 0 0 48px rgba(0,255,136,.08);
  transition: transform .3s;
}
.ft-detail:hover .ft-detail__icon { transform: scale(1.05); }
.ft-detail__icon-label {
  font-family: 'Fira Code', monospace;
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--f-neon);
  text-transform: uppercase;
}

/* 右侧信息区 */
.ft-detail__info h3 {
  font-size: 28px;
  font-weight: 800;
  color: var(--f-title);
  margin-bottom: 12px;
}
.ft-detail__info > p {
  font-size: 15px;
  color: #7a9a80;
  margin-bottom: 24px;
  line-height: 1.7;
}
.ft-detail__list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px 32px;
  list-style: none;
  padding: 0;
}
@media (max-width: 500px) {
  .ft-detail__list { grid-template-columns: 1fr; }
}
.ft-detail__list li {
  font-size: 14px;
  color: #8a9a8a;
  padding: 10px 0;
  border-bottom: 1px solid rgba(0,255,136,.06);
  display: flex;
  align-items: center;
  gap: 10px;
}
.ft-detail__list li::before {
  content: '▸';
  color: var(--f-neon);
  font-size: 12px;
  flex-shrink: 0;
}

/* ---------- CTA底部 ---------- */
.ft-cta {
  text-align: center;
  padding: 72px 20px;
  background: linear-gradient(180deg, transparent, rgba(0,255,136,.03), transparent);
  border-top: 1px solid rgba(0,255,136,.08);
}
.ft-cta__title {
  font-size: 30px;
  font-weight: 800;
  color: var(--f-title);
  margin-bottom: 10px;
}
.ft-cta__desc {
  color: #6a8a70;
  margin-bottom: 28px;
}
.ft-cta__btn {
  display: inline-block;
  padding: 15px 40px;
  font-size: 16px;
  font-weight: 700;
  color: #0a0f0a;
  background: linear-gradient(135deg, var(--f-neon), var(--f-teal));
  border-radius: 4px;
  text-decoration: none;
  transition: all .3s;
  box-shadow: 0 8px 32px rgba(0,255,136,.25);
}
.ft-cta__btn:hover {
  box-shadow: 0 12px 44px rgba(0,255,136,.4);
  transform: translateY(-2px);
}