/* ==========================================================================
   components.css — 区块与组件
   顺序：状态栏 → 终端首屏 → 关于我 → 能力链路 → 数字 → 项目 → 方法 → 适合谁 → 联系 → 页脚
   ========================================================================== */

/* ---------------------------------------------------------------- 按钮 */

.btn {
  --btn-pad: 0 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px; /* 触摸目标 ≥ 44px */
  padding: var(--btn-pad);
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-hairline);
  color: var(--color-text);
  background: transparent;
  cursor: pointer;
  transition: transform var(--dur-fast) ease-out, box-shadow var(--dur-base) var(--ease-out),
    background-color var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out);
}

/* 主按钮：青绿实底 + 近黑字，全站唯一的实心强调色块 */
.btn--primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #04120c;
  font-weight: 700;
  box-shadow: 0 6px 24px -12px rgba(0, 245, 160, 0.8);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px -14px rgba(0, 245, 160, 0.95);
}

.btn--primary:active {
  transform: translateY(0);
}

/* 次按钮：描边 + 悬停时背景擦过 */
.btn--ghost {
  position: relative;
  overflow: hidden;
  color: var(--color-muted);
}

.btn--ghost::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(0, 245, 160, 0.16), transparent);
  transform: translateX(-101%);
  transition: transform var(--dur-base) var(--ease-out);
}

.btn--ghost:hover::before {
  transform: translateX(0);
}

.btn--ghost:hover {
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn__arrow {
  font-family: var(--font-mono);
  transition: transform var(--dur-fast) ease-out;
}

.btn--ghost:hover .btn__arrow {
  transform: translateY(3px);
}

/* ---------------------------------------------------------------- 顶部状态条 */

.statusbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 12px;
  height: 46px;
  /* 与 1080 版心左右对齐，而不是贴屏幕边 */
  padding-inline: max(var(--gutter), calc((100% - var(--measure-wide)) / 2));
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-muted);
  background: rgba(6, 9, 11, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-hairline);
}

.statusbar__id {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-text);
}

/* 状态灯：工业感小圆点，缓慢呼吸 */
.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 10px rgba(0, 245, 160, 0.9);
  animation: breathe 3.2s var(--ease-out) infinite;
}

@keyframes breathe {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.statusbar__sep {
  padding-left: 12px;
  border-left: 1px solid var(--color-hairline);
  color: var(--color-muted);
}

.statusbar__open {
  margin-left: auto;
  color: var(--color-accent);
  border: 1px solid var(--color-border-soft);
  border-radius: 999px;
  padding: 3px 10px;
  letter-spacing: 0.1em;
}

/* ---------------------------------------------------------------- 首屏 · 终端 */

.hero {
  padding-top: clamp(40px, 9vw, 96px);
  padding-bottom: var(--space-4);
}

/* 首屏两栏：左边终端，右边页码索引（只在宽屏出现） */
.hero__grid {
  display: grid;
  gap: 36px;
}

/* 非对称：桌面端左边缘故意冲出栅格；手机上不出格，避免圆角被屏幕裁掉 */
.terminal {
  position: relative;
  margin-left: 0;
  border: 1px solid var(--color-edge);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(17, 26, 29, 0.96), rgba(13, 18, 21, 0.92));
  box-shadow: var(--glow-strong), var(--shadow-3);
  overflow: hidden;
}

/* 顶部青绿细光带 */
.terminal::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  opacity: 0.8;
}

.terminal__bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-hairline);
  background: rgba(0, 0, 0, 0.24);
}

.terminal__dots {
  display: inline-flex;
  gap: 6px;
}

.terminal__dots i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--color-hairline);
}

.terminal__dots i:first-child {
  background: rgba(0, 245, 160, 0.55);
}

.terminal__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--color-muted);
}

.terminal__body {
  padding: clamp(24px, 6vw, 48px) clamp(20px, 5.5vw, 44px) clamp(28px, 7vw, 56px);
}

/* 命令行 */
.terminal__cmd {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: clamp(16px, 4vw, 28px);
}

.terminal__cmd .prompt {
  color: var(--color-accent);
}

/* 光标：方块闪烁 */
.caret {
  display: inline-block;
  width: 9px;
  height: 1.05em;
  translate: 0 2px;
  background: var(--color-accent);
  animation: blink 1.1s steps(1, end) infinite;
}

@keyframes blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

/* 名字：降为"命令回显"的中等体量，把最大字号让给宣言 */
.hero__name {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4.4vw, 2rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin-bottom: clamp(8px, 1.6vw, 14px);
  color: #c6d1d2;
}

/* 一句话介绍：全页最大字号，视觉主角，永远两行 */
.hero__line {
  font-family: var(--font-display);
  font-size: clamp(2.125rem, 9.4vw, 5rem);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.04em;
  margin-bottom: clamp(20px, 4vw, 32px);
  color: var(--color-text);
}

/* 一句话介绍：分成两段，手机上各占一行，不在词中间断行 */
.hero__seg {
  display: block;
}

.hero__seg--grad {
  background: linear-gradient(96deg, var(--color-accent) 10%, var(--color-accent-2) 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* 平台/能力补充行 */
.hero__meta {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.06em;
  color: var(--color-muted);
  line-height: 2;
  margin-bottom: clamp(24px, 6vw, 36px);
}

.hero__meta b {
  color: var(--color-text);
  font-weight: 400;
}

.hero__meta .bar {
  color: rgba(0, 245, 160, 0.5);
  padding-inline: 6px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 首屏右侧页码索引：宽屏才有，用信息填满空白而不是装饰 */
.index {
  display: none;
}

.index__label {
  display: block;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-edge);
}

.index__list {
  display: grid;
}

.index__link {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-hairline);
  font-size: 14px;
  color: var(--color-muted);
  transition: color var(--dur-fast) ease-out, border-color var(--dur-fast) ease-out;
}

.index__link:hover,
.index__link:focus-visible {
  color: var(--color-text);
  border-bottom-color: var(--color-border);
}

.index__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(0, 245, 160, 0.55);
  font-variant-numeric: tabular-nums;
}

/* ---------------------------------------------------------------- 关于我 */

.about__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.about__para {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 12px;
  align-items: start;
  font-size: var(--fs-body);
  color: #b9c6c7;
}

.about__para span.num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  opacity: 0.75;
  padding-top: 6px;
  font-variant-numeric: tabular-nums;
}

/* 关于我里的那句"我不相信灵感"做一个引言块 */
.quote {
  position: relative;
  margin-top: var(--space-4);
  padding: 4px 0 4px 24px;
  font-size: clamp(1.0625rem, 2.2vw, 1.375rem);
  line-height: 1.65;
  color: var(--color-text);
}

/* 用一条渐隐竖线代替整条亮绿边，安静一点 */
.quote::before {
  content: "";
  position: absolute;
  left: 0;
  top: 2px;
  bottom: 2px;
  width: 2px;
  background: linear-gradient(
    to bottom,
    var(--color-accent),
    rgba(0, 245, 160, 0.08)
  );
}

/* ---------------------------------------------------------------- 发光描边卡片（通用） */

.card {
  --mx: 50%;
  --my: 50%;
  position: relative;
  padding: var(--space-4);
  border: 1px solid var(--color-edge);
  border-radius: var(--radius-md);
  background: linear-gradient(165deg, rgba(17, 26, 29, 0.9), rgba(10, 14, 16, 0.9));
  box-shadow: var(--shadow-2);
  transition: border-color var(--dur-base) var(--ease-out),
    box-shadow var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out);
  overflow: hidden;
}

/* 光标跟随高光：盖在卡片面上、压在文字下方 */
.card::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0;
  background: radial-gradient(
    220px circle at var(--mx) var(--my),
    rgba(0, 245, 160, 0.16),
    transparent 62%
  );
  transition: opacity var(--dur-base) var(--ease-out);
}

/* 卡片内所有内容抬到高光之上 */
.card > * {
  position: relative;
  z-index: 1;
}

.card:hover,
.card:focus-within {
  border-color: var(--color-border);
  box-shadow: var(--glow-soft), var(--shadow-2);
  transform: translateY(-3px);
}

.card:hover::after,
.card:focus-within::after {
  opacity: 1;
}

.card__index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(0, 245, 160, 0.7);
  font-variant-numeric: tabular-nums;
}

.card__title {
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-block: 10px 10px;
}

.card__text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-muted);
}

/* ---------------------------------------------------------------- 【待补充】占位
   刻意做得醒目：虚线圈 + 青绿字，一眼能看出"这里还没填"
   ------------------------------------------------------------------ */

.ph {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--color-accent);
  background: rgba(0, 245, 160, 0.1);
  border: 1px dashed rgba(0, 245, 160, 0.55);
  border-radius: 4px;
  padding: 1px 8px;
  vertical-align: 1px;
  white-space: nowrap;
}

/* 整块待补充的虚线底卡 */
.ph-block {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 18px;
  border: 1px dashed rgba(0, 245, 160, 0.35);
  border-radius: var(--radius-md);
  background: rgba(0, 245, 160, 0.03);
  font-size: 14px;
  color: var(--color-muted);
}

/* ---------------------------------------------------------------- 头像 */

.avatar {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--color-border);
  box-shadow: 0 0 0 3px rgba(0, 245, 160, 0.08), 0 0 18px -6px rgba(0, 245, 160, 0.7);
  background: var(--color-surface-2);
}

/* 关于我标题旁的头像：与标题成组，尺寸随屏幕收敛，不抢标题 */
.avatar--lg {
  width: 48px;
  height: 48px;
  border-width: 1px;
  box-shadow: 0 0 0 3px rgba(0, 245, 160, 0.07), var(--glow-soft);
  flex: none;
}

/* 状态条里的小头像 */
.avatar--xs {
  width: 22px;
  height: 22px;
  box-shadow: none;
}

/* ---------------------------------------------------------------- 学员评价 */

.reviews {
  display: grid;
  gap: 14px;
}

.review {
  display: grid;
  gap: 10px;
  align-content: start;
}

.review__mark {
  font-family: var(--font-display);
  font-size: 34px;
  line-height: 0.6;
  color: rgba(0, 245, 160, 0.5);
  height: 18px;
}

.review__text {
  font-size: 15px;
  line-height: 1.85;
  color: #cfdadb;
}

.review__who {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  padding-top: 4px;
  border-top: 1px dashed var(--color-hairline);
}

.reviews__hint {
  margin-top: var(--space-4);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--color-muted);
}

/* ---------------------------------------------------------------- 能力链路 */

.chain {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chain__item {
  position: relative;
  padding-left: 34px;
}

/* 左侧竖向连线：把四步串成一条链路 */
.chain__item::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 18px;
  bottom: -14px;
  width: 1px;
  background: linear-gradient(
    to bottom,
    var(--color-border),
    rgba(0, 245, 160, 0.06)
  );
}

.chain__item:last-child::before {
  display: none;
}

/* 节点小方点 */
.chain__item::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 22px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--color-accent);
  background: var(--color-bg);
  box-shadow: 0 0 12px rgba(0, 245, 160, 0.6);
  transform: rotate(45deg);
}

.chain__step {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--color-muted);
}

.chain__name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-block: 2px 6px;
}

.chain__desc {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--color-muted);
}

.chain__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.tag {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  border: 1px solid var(--color-hairline);
  border-radius: 3px;
  color: var(--color-muted);
}

.tags--end {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: var(--space-4);
}

/* 链路结束语 */
.chain__closing {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px dashed var(--color-hairline);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
}

/* ---------------------------------------------------------------- 我的数字 */

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--color-hairline);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.stat {
  background: var(--color-surface);
  padding: 22px 14px;
  text-align: center;
}

.stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 8vw, 2.75rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 24px rgba(0, 245, 160, 0.35);
}

.stat__label {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--color-muted);
}

/* ---------------------------------------------------------------- 项目与经历 */

.projects {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.project {
  display: grid;
  gap: 10px;
  height: 100%;
  align-content: start;
}

.project__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.project__name {
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.project__sum {
  font-size: 15px;
  line-height: 1.8;
  color: #c9d5d6;
}

.project__row {
  display: grid;
  grid-template-columns: 62px 1fr;
  gap: 10px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-muted);
}

.project__row dt {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: rgba(0, 245, 160, 0.62);
  padding-top: 3px;
}

/* 项目里的数据高亮 */
.project__row b {
  color: var(--color-text);
  font-weight: 600;
}

/* ---------------------------------------------------------------- 我的方法 */

.method {
  display: grid;
  gap: 12px;
  counter-reset: step;
}

.method__step {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 12px;
  align-items: start;
  padding: 18px 0;
  border-bottom: 1px dashed var(--color-hairline);
}

.method__step:last-child {
  border-bottom: 0;
}

.method__no {
  font-family: var(--font-mono);
  font-size: 1.375rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: rgba(0, 245, 160, 0.26);
  font-variant-numeric: tabular-nums;
}

.method__name {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.method__desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-muted);
}

/* ---------------------------------------------------------------- 适合谁 */

.fit {
  display: grid;
  gap: 12px;
}

.fit__item {
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 12px;
  align-items: start;
  font-size: 15px;
  line-height: 1.75;
  color: #cfdadb;
}

.fit__item i {
  font-style: normal;
  font-family: var(--font-mono);
  color: rgba(0, 245, 160, 0.8);
  font-size: 14px;
  line-height: 1.6;
  padding-top: 3px;
}

/* ---------------------------------------------------------------- 联系 */

.cta {
  --mx: 50%;
  --my: 50%;
  position: relative;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: clamp(24px, 6vw, 48px);
  background:
    radial-gradient(120% 100% at 0% 0%, rgba(0, 245, 160, 0.1), transparent 55%),
    linear-gradient(160deg, rgba(17, 26, 29, 0.95), rgba(10, 14, 16, 0.95));
  box-shadow: var(--glow-soft), var(--shadow-3);
  overflow: hidden;
}

/* 联系区同样有跟随高光 */
.cta::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0;
  background: radial-gradient(
    260px circle at var(--mx) var(--my),
    rgba(0, 245, 160, 0.14),
    transparent 65%
  );
  transition: opacity var(--dur-base) var(--ease-out);
}

.cta:hover::after {
  opacity: 1;
}

.cta > * {
  position: relative;
  z-index: 1;
}

.cta__grid {
  display: grid;
  gap: var(--space-5);
}

.cta__title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 6.5vw, 2.25rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.cta__desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-muted);
  margin-bottom: var(--space-4);
}

.cta__list {
  display: grid;
  gap: 10px;
}

.cta__row {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.24);
  font-size: 14.5px;
  transition: border-color var(--dur-base) var(--ease-out),
    background-color var(--dur-base) var(--ease-out);
}

.cta__row:hover,
.cta__row:focus-visible {
  border-color: var(--color-border);
  background: rgba(0, 245, 160, 0.05);
}

.cta__row .k {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--color-muted);
  min-width: 60px;
}

.cta__row .v {
  color: var(--color-text);
  word-break: break-all;
}

/* 二维码 */
.qr {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  justify-self: center;
}

.qr__frame {
  padding: 8px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-edge);
  background: #eef7f4;
  box-shadow: 0 10px 30px -18px rgba(0, 0, 0, 0.9);
}

.qr__frame img {
  width: min(168px, 44vw);
  height: auto;
  border-radius: 4px;
}

.qr__cap {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--color-muted);
}

/* ---------------------------------------------------------------- 页脚 */

.footer {
  padding-block: var(--space-5) var(--space-6);
  border-top: 1px solid var(--color-hairline);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--color-muted);
  text-transform: uppercase;
}

.footer__sig {
  color: rgba(0, 245, 160, 0.55);
}

/* ==========================================================================
   桌面端：≥ 900px 放大构成，保持非对称
   ========================================================================== */

@media (min-width: 900px) {
  /* 桌面端首屏撑满一屏并垂直居中，避免上浮在小块区域里 */
  .hero {
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: calc(100vh - 46px);
    padding-top: var(--space-6);
    padding-bottom: var(--space-6);
  }

  /* 桌面端宣言保持两行，字号拉满才有冲击力 */
  .hero__seg {
    display: block;
  }

  .terminal {
    margin-left: 0;
  }

  .terminal__body {
    padding: 52px 56px 56px;
  }

  /* 首屏补充信息行 */
  .hero__meta {
    font-size: 13px;
  }

  .chain {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }

  /* 桌面端链路改为横向：连线在上方，标签在线之上，不再压线 */
  .chain__item {
    padding-left: 0;
    padding-top: 46px;
  }

  .chain__item::before {
    left: 20px;
    right: -24px;
    top: 24px;
    bottom: auto;
    width: auto;
    height: 1px;
    background: linear-gradient(to right, var(--color-edge-strong), rgba(232, 241, 242, 0.04));
  }

  .chain__item::after {
    left: 14px;
    top: 19px;
  }

  .chain__step {
    position: absolute;
    top: 0;
    left: 0;
    right: auto;
  }

  /* 四列描述底部齐平，标签行也对齐 */
  .chain__desc {
    min-height: 76px;
  }

  .projects {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    align-items: stretch;
    gap: 16px;
  }

  /* 学员评价三栏 */
  .reviews {
    grid-template-columns: repeat(3, 1fr);
    align-items: stretch;
    gap: 16px;
  }

  /* 三栏等高，避免参差；手机上不设最小高度，免得空卡占屏 */
  .review {
    min-height: 168px;
  }

  /* 第一个项目占满两列，做成主推 */
  .projects > .project:first-child {
    grid-column: 1 / -1;
  }

  .method {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .method__step {
    grid-template-columns: 1fr;
    gap: 8px;
    border-bottom: 0;
    border-top: 1px solid var(--color-hairline);
    padding-top: 20px;
  }

  .cta__grid {
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: var(--space-6);
  }

  .qr {
    justify-self: end;
  }
}

/* 窄屏收紧按钮内边距：保证两个按钮能并排，不各占一行 */
@media (max-width: 400px) {
  .btn {
    --btn-pad: 0 18px;
    font-size: 13.5px;
  }

  .hero__actions {
    gap: 10px;
  }
}

/* ==========================================================================
   细屏兜底：≤ 360px 收紧间距
   ========================================================================== */

@media (max-width: 360px) {
  .hero__actions .btn {
    flex: 1 1 100%;
  }

  .about__para {
    grid-template-columns: 26px 1fr;
  }
}

/* ==========================================================================
   宽屏（≥ 1080px）：首屏切成两栏，右侧放页码索引
   用信息填满空白，而不是加装饰
   ========================================================================== */

@media (min-width: 1080px) {
  .hero__grid {
    grid-template-columns: minmax(0, 1fr) 236px;
    gap: 52px;
    align-items: end;
  }

  .index {
    display: block;
    padding-bottom: 2px;
  }

  .terminal__body {
    padding: 56px 64px 60px;
  }
}

@media (min-width: 640px) {
  .avatar--lg {
    width: 60px;
    height: 60px;
  }
}

@media (min-width: 1080px) {
  /* 数字条与项目卡同宽，保持一套栅格；靠更大字号充实空间 */
  .stat {
    padding: 34px 20px;
  }

  .stat__num {
    font-size: 3.5rem;
  }
}