/* ============================================================
   04 产品功能展示 · CAPABILITIES
   选择器全部以 #features 开头 · 仅使用 tokens.css 变量
   所有界面为静态高保真视觉展示，无真实交互
   ============================================================ */

/* ============================================================
   功能块通用布局（图文左右，editorial 错落）
   ============================================================ */
#features .feat-block {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  align-items: center;
  gap: clamp(2rem, 5vw, 4.5rem);
  margin-bottom: clamp(4rem, 9vw, 7rem);
}
#features .feat-block:last-child { margin-bottom: 0; }

/* 反向布局：界面在左，文案在右 */
#features .feat-block--reverse .feat-copy { order: 2; }
#features .feat-block--reverse .feat-ui { order: 1; }

/* —— 文案列 —— */
#features .feat-copy { position: relative; }
#features .feat-idx {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.4rem, 5vw, 4rem);
  color: transparent;
  -webkit-text-stroke: 1px var(--line-bright);
  line-height: 1;
  margin-bottom: 0.6rem;
}
#features .feat-title {
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  color: var(--text);
  margin-bottom: 1.2rem;
}
#features .feat-lead {
  font-size: var(--fs-lead);
  color: var(--text);
  line-height: 1.6;
  margin-bottom: 1.2rem;
  padding-left: 1rem;
  border-left: 2px solid var(--cyan);
}
#features .feat-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}
#features .feat-list li {
  position: relative;
  padding-left: 1.5rem;
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--text-dim);
}
#features .feat-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 6px;
  height: 6px;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan-glow);
  transform: rotate(45deg);   /* 菱形刻度点 */
}

/* ============================================================
   静态界面容器（窗口母题）
   ============================================================ */
#features .feat-ui {
  background: var(--ink);
  border: 1px solid var(--line);
  overflow: hidden;
}

/* —— 窗口顶栏 —— */
#features .feat-ui-bar {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.7rem 1rem;
  background: var(--ink-2);
  border-bottom: 1px solid var(--line);
}
#features .feat-ui-dots { display: inline-flex; gap: 0.4rem; }
#features .feat-ui-dots i {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--line-bright);
}
#features .feat-ui-name {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--text-mute);
}
#features .feat-ui-badge {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
  padding: 0.15em 0.6em;
  border: 1px solid var(--cyan-deep);
  border-radius: var(--radius);
}

/* ============================================================
   5.1 深度研究 Agent —— Chat 布局
   ============================================================ */
#features .feat-chat {
  display: grid;
  grid-template-columns: 1fr 0.85fr;
  min-height: 320px;
}

/* —— 对话线程 —— */
#features .feat-chat-thread {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  padding: 1.2rem;
  border-right: 1px solid var(--line);
}
#features .feat-bubble {
  max-width: 88%;
  padding: 0.7rem 0.95rem;
  font-size: 0.85rem;
  line-height: 1.5;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
}
#features .feat-bubble--user {
  align-self: flex-end;
  background: var(--ink-3);
  color: var(--text);
  border-bottom-right-radius: 2px;
}
#features .feat-bubble--ai {
  align-self: flex-start;
  background: var(--cyan-soft);
  border-color: var(--cyan-deep);
  color: var(--text-dim);
  border-bottom-left-radius: 2px;
}
#features .feat-bubble-cite {
  display: block;
  margin-top: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
}
/* 打字中省略点 */
#features .feat-bubble--typing {
  display: inline-flex;
  gap: 0.3rem;
  align-items: center;
  padding: 0.9rem 1rem;
}
#features .feat-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  opacity: 0.4;
  animation: feat-typing 1.2s ease-in-out infinite;
}
#features .feat-dot:nth-child(2) { animation-delay: 0.2s; }
#features .feat-dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes feat-typing {
  0%, 60%, 100% { opacity: 0.35; transform: translateY(0); }
  30% { opacity: 1; transform: translateY(-3px); }
}

/* —— 配置面板 —— */
#features .feat-config {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  padding: 1.2rem;
  background: var(--ink-2);
}
#features .feat-config-title {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-mute);
}
#features .feat-field {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
}
#features .feat-field--col {
  flex-direction: column;
  align-items: stretch;
  gap: 0.5rem;
}
#features .feat-field-k {
  font-size: 0.78rem;
  color: var(--text-dim);
}
#features .feat-field-k b {
  font-family: var(--font-mono);
  color: var(--cyan);
  font-weight: 500;
}

/* —— 静态 toggle 开关 —— */
#features .feat-toggle {
  flex: 0 0 auto;
  width: 34px; height: 18px;
  border-radius: 10px;
  background: var(--ink-3);
  border: 1px solid var(--line-bright);
  position: relative;
  transition: background 0.3s var(--ease);
}
#features .feat-toggle i {
  position: absolute;
  top: 2px; left: 2px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--text-mute);
  transition: transform 0.3s var(--ease), background 0.3s var(--ease);
}
#features .feat-toggle--on {
  background: var(--cyan-soft);
  border-color: var(--cyan);
}
#features .feat-toggle--on i {
  transform: translateX(16px);
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan-glow);
}

/* —— 静态 slider 滑块 —— */
#features .feat-slider {
  display: block;
  height: 4px;
  border-radius: 2px;
  background: var(--ink-3);
  border: 1px solid var(--line);
  position: relative;
}
#features .feat-slider i {
  position: absolute;
  inset: 0 auto 0 0;
  width: var(--val, 50%);
  background: var(--cyan);
  border-radius: 2px;
  box-shadow: 0 0 8px var(--cyan-glow);
}
#features .feat-slider i::after {
  content: "";
  position: absolute;
  right: -6px; top: 50%;
  width: 11px; height: 11px;
  transform: translateY(-50%);
  border-radius: 50%;
  background: var(--text);
  border: 2px solid var(--cyan);
}

/* —— 迷你知识图谱 —— */
#features .feat-graph {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: auto;
  padding-top: 0.85rem;
  border-top: 1px solid var(--line);
}
#features .feat-graph-svg {
  width: 100%;
  height: auto;
  background: var(--ink);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
#features .feat-graph-svg circle[fill="var(--cyan)"] {
  filter: drop-shadow(0 0 6px var(--cyan-glow));
}
/* 双视图切换标签（静态态） */
#features .feat-viewswitch {
  display: inline-flex;
  align-self: flex-start;
  border: 1px solid var(--line-bright);
  border-radius: var(--radius);
  overflow: hidden;
}
#features .feat-viewswitch b {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--text-mute);
  padding: 0.25em 0.7em;
}
#features .feat-viewswitch b.is-active {
  background: var(--cyan-soft);
  color: var(--cyan);
}

/* ============================================================
   5.2 深度报告生成 —— 公式 + 比选表
   ============================================================ */
#features .feat-report {
  padding: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
}

/* —— 公式卡片（LaTeX 质感） —— */
#features .feat-formula {
  position: relative;
  padding: 1.4rem 1.2rem 1.2rem;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
#features .feat-formula-tag {
  position: absolute;
  top: -0.7rem; left: 1rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
  background: var(--ink);
  padding: 0.1em 0.6em;
  border: 1px solid var(--cyan-deep);
  border-radius: var(--radius);
}
#features .feat-eq {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  color: var(--text);
  padding: 0.5rem 0;
}
#features .feat-eq + .feat-eq {
  border-top: 1px dashed var(--line);
}
#features .feat-eq-var {
  font-style: italic;         /* 变量斜体，数学排版惯例 */
  color: var(--text);
}
#features .feat-eq-var sub {
  font-style: normal;
  font-size: 0.65em;
}
#features .feat-eq-op { color: var(--text-mute); }
#features .feat-eq-dot { color: var(--cyan); }

/* —— 分式排版 —— */
#features .feat-frac {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  vertical-align: middle;
  font-style: italic;
  line-height: 1.05;
}
#features .feat-frac-bar {
  width: 100%;
  min-width: 2.2ch;
  height: 1px;
  background: var(--text);
  margin: 0.15em 0;
}
#features .feat-frac-n,
#features .feat-frac-d { padding: 0 0.3em; }
#features .feat-frac-d sub { font-style: normal; font-size: 0.65em; }

/* —— 多模型比选表（斑马纹 + 推荐行高亮） —— */
#features .feat-table-cap {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-mute);
  margin-bottom: 0.6rem;
}
#features .feat-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}
#features .feat-table th,
#features .feat-table td {
  text-align: left;
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--line);
  color: var(--text-dim);
  font-weight: 400;
}
#features .feat-table thead th {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-mute);
  background: var(--ink-3);
}
#features .feat-table tbody th {
  color: var(--text);
  font-weight: 500;
}
/* 斑马纹：奇偶行交替 */
#features .feat-table tbody tr:nth-child(odd)  { background: var(--ink-2); }
#features .feat-table tbody tr:nth-child(even) { background: var(--ink-3); }
/* 推荐行电光青高亮 */
#features .feat-row--rec { background: var(--cyan-soft) !important; }
#features .feat-row--rec th,
#features .feat-row--rec td {
  color: var(--text);
  border-color: var(--cyan-deep);
}
#features .feat-rec-mark {
  display: inline-block;
  margin-left: 0.4em;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  color: var(--void);
  background: var(--cyan);
  padding: 0.1em 0.5em;
  border-radius: var(--radius);
  vertical-align: middle;
}

/* ============================================================
   5.3 专利撰写 —— Stepper + 导出面板
   ============================================================ */
#features .feat-patent { padding: 1.4rem; }

/* —— 横向 Stepper —— */
#features .feat-stepper {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  margin-bottom: 1.6rem;
}
#features .feat-step {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.6rem;
}
/* 连接线（连到下一步） */
#features .feat-step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 7px;                    /* 对齐圆点中心 */
  left: 50%;
  width: 100%;
  height: 1.5px;
  background: var(--line-bright);
  z-index: 0;
}
#features .feat-step-dot {
  position: relative;
  z-index: 1;
  width: 15px; height: 15px;
  border-radius: 50%;
  background: var(--ink-2);
  border: 1.5px solid var(--line-bright);
  transition: all 0.3s var(--ease);
}
#features .feat-step-label {
  font-size: 0.72rem;
  line-height: 1.35;
  color: var(--text-mute);
}
/* 已完成步骤 */
#features .feat-step--done .feat-step-dot {
  background: var(--cyan-deep);
  border-color: var(--cyan);
}
#features .feat-step--done::after { background: var(--cyan-deep); }
#features .feat-step--done .feat-step-label { color: var(--text-dim); }
/* 当前步骤（高亮 + 光环） */
#features .feat-step--current .feat-step-dot {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-soft), 0 0 12px var(--cyan-glow);
}
#features .feat-step--current .feat-step-label {
  color: var(--cyan);
  font-weight: 500;
}

/* —— 底部：BOM + 导出 —— */
#features .feat-patent-body {
  display: grid;
  grid-template-columns: 1fr 0.8fr;
  gap: 1rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
}
#features .feat-bom {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
#features .feat-bom-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
#features .feat-bom-list li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.76rem;
  color: var(--text-dim);
  padding: 0.4rem 0.6rem;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
#features .feat-bom-id {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--cyan);
  padding: 0.1em 0.45em;
  border: 1px solid var(--cyan-deep);
  border-radius: var(--radius);
}
#features .feat-bom-rel {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-mute);
}

/* —— 导出面板 —— */
#features .feat-export {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  padding: 0.9rem;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
#features .feat-file {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.76rem;
  color: var(--text);
}
#features .feat-file svg { width: 20px; height: 20px; flex: 0 0 auto; }
#features .feat-export-btns { display: flex; gap: 0.5rem; margin-top: auto; }
#features .feat-btn {
  flex: 1;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.5em 0.6em;
  border: 1px solid var(--line-bright);
  border-radius: var(--radius);
  color: var(--text-dim);
}
#features .feat-btn--primary {
  border-color: var(--cyan);
  color: var(--cyan);
  background: var(--cyan-soft);
}

/* ============================================================
   响应式 —— 平板/手机
   ============================================================ */
@media (max-width: 900px) {
  /* 图文转单列：文案在上、界面在下（含反向块归位） */
  #features .feat-block,
  #features .feat-block--reverse {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  #features .feat-block--reverse .feat-copy,
  #features .feat-block--reverse .feat-ui { order: 0; }
}

@media (max-width: 768px) {
  /* Chat：对话与配置转竖排 */
  #features .feat-chat { grid-template-columns: 1fr; }
  #features .feat-chat-thread {
    border-right: none;
    border-bottom: 1px solid var(--line);
  }

  /* 配置面板：手机下收紧字段间距与内边距，提升演示面板的从容感 */
  #features .feat-config {
    gap: 0.6rem;
    padding: 1rem;
  }

  /* 专利底部 BOM/导出转竖排 */
  #features .feat-patent-body { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  /* Stepper 转竖向流程 */
  #features .feat-stepper {
    grid-template-columns: 1fr;
    gap: 0;
    padding-left: 0;
  }
  #features .feat-step {
    flex-direction: row;
    align-items: center;
    gap: 0.9rem;
    text-align: left;
    padding: 0.5rem 0;
  }
  /* 横线转竖线 */
  #features .feat-step:not(:last-child)::after {
    top: 15px;
    left: 7px;
    width: 1.5px;
    height: 100%;
  }
  #features .feat-step-label { flex: 1; }

  /* 比选表横向滚动，防窄屏挤压 */
  #features .feat-table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  #features .feat-table { min-width: 420px; }
}

/* 极窄屏：隐藏迷你知识图谱，呼应 hero 手机隐藏示波曲线的降级策略，
   降低信息密度、保持从容感（图谱为锦上添花的演示装饰，非核心信息） */
@media (max-width: 480px) {
  #features .feat-graph { display: none; }
}

/* ============================================================
   动效偏好 —— 关闭打字动画
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  #features .feat-dot { animation: none; }
}