/*
 * [INPUT]: index.html 与 app.js 的语义类名，base.css 的主题变量。
 * [OUTPUT]: 断点适配、首页原生表格单元格间距、共享手机导航与减少动态效果策略。
 * [POS]: dist 样式模块 responsive，由 styles.css 按依赖顺序加载。
 * [PROTOCOL]: 变更时更新此头部，然后检查 CLAUDE.md
 */
@media (min-width: 1441px) {
  .section-shell,
  .site-footer {
    max-width: 1280px;
    width: 88.9%;
  }
}
@media (max-width: 1350px) {
  .site-footer {
    margin: 0 5.55%;
  }
  .demo-grid {
    grid-template-columns: 1fr 105px 1fr;
    gap: 20px;
    padding: 25px 24px;
  }
  .mini-core:before,
  .mini-core:after {
    width: 25px;
  }
  .use-card {
    padding: 23px 20px;
  }
  .use-card h3 {
    font-size: 15px;
  }
  .difference-inner {
    gap: 55px;
  }
}
@media (max-width: 1050px) {
  .hero-actions {
    gap: 15px;
  }
  .hero-actions .button {
    font-size: 12px;
    gap: 14px;
  }
  .hero-actions .text-link {
    font-size: 12px;
    gap: 9px;
  }
  .hero-visual {
    min-height: 480px;
  }
  .intro {
    gap: 55px;
  }
  .intro h2,
  .section-heading h2 {
    font-size: 38px;
  }
  .use-cases {
    grid-template-columns: repeat(2, 1fr);
  }
  .use-card:nth-child(2) {
    border-right: 0;
  }
  .use-card:nth-child(-n + 2) {
    border-bottom: 1px solid #2a3623;
  }
  .case-diagram {
    height: 135px;
  }
  .use-card h3 {
    font-size: 17px;
  }
  .difference-inner {
    gap: 38px;
    grid-template-columns: 0.85fr 1.15fr;
  }
  .difference-copy h2 {
    font-size: 36px;
  }
  .metrics > div {
    padding-left: 20px;
  }
  .metric-value {
    font-size: 30px;
  }
  .metric-value > span {
    font-size: 17px;
  }
  .closing h2 {
    font-size: 36px;
  }
}
@media (max-width: 800px) {
  .hero-visual {
    min-height: 480px;
  }
  .engine-core .engine-word {
    font-size: 70px;
  }
  .data-chip {
    padding: 9px;
    gap: 5px;
    font-size: 9px;
  }
  .data-chip small {
    font-size: 7px;
  }
  .chip-icon {
    font-size: 16px;
  }
  .output-chip {
    right: 3%;
    top: 65%;
  }
  .input-chip {
    left: 3%;
    top: 24%;
  }
  .data-chip em {
    font-size: 8px;
  }
  .metrics {
    gap: 20px;
  }
  .metrics > div {
    padding-left: 15px;
  }
  .metric-value {
    font-size: 27px;
  }
  .metric-value > span {
    font-size: 15px;
  }
  .metrics p {
    font-size: 11px;
  }
  .intro {
    padding-block: 80px;
    gap: 45px;
  }
  .intro-body .lead {
    font-size: 22px;
  }
  .intro-body > p:not(.lead) {
    font-size: 1rem;
  }
  .section-heading {
    gap: 25px;
  }
  .section-heading h2 {
    font-size: 32px;
  }
  .section-heading .section-description {
    font-size: 1rem;
  }
  .demo-grid {
    grid-template-columns: 1fr 75px 1fr;
    gap: 15px;
    padding: 24px 18px;
  }
  .mini-core {
    width: 50px;
    height: 50px;
    line-height: 50px;
    font-size: 36px;
    border-radius: 12px;
  }
  .mini-core:before,
  .mini-core:after {
    width: 16px;
    top: 25px;
  }
  .message-card {
    padding: 13px;
  }
  .message-card p {
    font-size: 1rem;
  }
  .result-code {
    font-size: 9px;
    line-height: 1.9;
  }
  .result-summary {
    font-size: 0.875rem;
  }
  .demo-footer {
    padding: 16px 18px;
  }
  .demo-footer > p {
    font-size: 10px;
  }
  .playground-toolbar {
    padding: 12px 18px;
  }
  .scenario-tabs button {
    padding: 7px 13px;
  }
  .demo-badge {
    font-size: 9px;
  }
  .workflow-notes {
    gap: 22px;
  }
  .workflow-notes > div {
    grid-template-columns: 23px 1fr;
    gap: 10px;
  }
  .workflow-notes p {
    font-size: 0.875rem;
  }
  .difference-inner {
    grid-template-columns: 1fr;
    padding-block: 65px;
    gap: 40px;
  }
  .difference-copy {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 40px;
  }
  .difference-copy .eyebrow {
    grid-column: 1/-1;
  }
  .difference-copy .section-description {
    margin: 4px 0 0;
  }
  .difference-note {
    grid-column: 1/-1;
    margin-top: 20px;
  }
  .closing h2 {
    font-size: 32px;
  }
  .footer-bottom {
    flex-wrap: wrap;
    gap: 10px 20px;
  }
  .footer-bottom > p {
    order: 3;
    flex-basis: 100%;
  }
}
@media (max-width: 650px) {
  .hero-visual {
    min-height: 400px;
  }
  .engine-core .engine-word {
    font-size: 80px;
  }
  .data-chip {
    font-size: 10px;
    padding: 11px;
    gap: 8px;
  }
  .data-chip small {
    font-size: 8px;
  }
  .input-chip {
    left: 5%;
    top: 24%;
  }
  .output-chip {
    top: 64%;
    right: 4%;
  }
  .hero-actions .button {
    font-size: 13px;
  }
  .hero-actions .text-link {
    font-size: 12px;
  }
  .metrics {
    grid-template-columns: repeat(2, 1fr);
    padding-top: 35px;
    gap: 26px 16px;
  }
  .metrics > div {
    padding-left: 20px;
  }
  .metrics > div:nth-child(3) {
    padding-left: 0;
    border: 0;
  }
  .metric-value {
    font-size: 32px;
  }
  .metric-value > span {
    font-size: 18px;
  }
  .metrics p {
    font-size: 12px;
  }
  .metrics .source-note {
    font-size: 10px;
    margin-top: 0;
    line-height: 1.8;
  }
  .intro {
    grid-template-columns: 1fr;
    gap: 33px;
    padding-top: 75px;
    padding-bottom: 75px;
  }
  .intro h2 {
    font-size: 39px;
  }
  .intro-body {
    padding: 0;
  }
  .intro-body .lead {
    font-size: 22px;
  }
  .intro-body > p:not(.lead) {
    font-size: 1rem;
  }
  .intro .eyebrow {
    font-size: 9px;
    margin-bottom: 23px;
  }
  .section-heading {
    display: block;
    margin-bottom: 28px;
  }
  .section-heading h2 {
    font-size: 33px;
  }
  .section-heading .section-description {
    font-size: 1rem;
    margin-top: 20px;
  }
  .playground-section {
    padding-top: 0;
    padding-bottom: 72px;
  }
  .playground-toolbar {
    flex-wrap: wrap;
    padding: 14px 16px;
    gap: 12px;
  }
  .scenario-tabs {
    width: 100%;
    gap: 5px;
  }
  .scenario-tabs button {
    flex: 1;
    padding: 8px 9px;
    font-size: 0.875rem;
  }
  .demo-badge {
    font-size: 10px;
    padding-left: 1px;
  }
  .demo-grid {
    grid-template-columns: 1fr;
    padding: 23px 20px;
    gap: 10px;
  }
  .panel-label {
    font-size: 11px;
  }
  .message-card {
    padding: 17px;
    margin-top: 17px;
  }
  .message-card p {
    font-size: 1rem;
    min-height: 0;
  }
  .questions {
    margin-top: 20px;
  }
  .questions .panel-label {
    font-size: 10px;
  }
  #question-list > div {
    font-size: 12px;
    padding: 6px 0;
  }
  #question-list > div > span {
    font-size: 11px;
  }
  .demo-engine {
    flex-direction: row;
    justify-content: flex-start;
    gap: 14px;
    padding: 28px 0 23px;
    border-bottom: 1px solid #2a3721;
    margin-bottom: 16px;
  }
  .mini-core {
    width: 39px;
    height: 39px;
    line-height: 39px;
    font-size: 29px;
    border-radius: 10px;
  }
  .mini-core:before,
  .mini-core:after {
    display: none;
  }
  .engine-label {
    margin-top: 0;
    font-size: 8px;
    letter-spacing: 2px;
  }
  .process-steps {
    flex-direction: row;
    gap: 8px;
    margin: 0 0 0 auto;
    font-size: 10px;
  }
  .process-steps i {
    height: 1px;
    width: 8px;
  }
  .result-top {
    margin-top: 17px;
    font-size: 11px;
  }
  #copy-result {
    font-size: 11px;
  }
  .result-code {
    font-size: 12px;
    line-height: 1.85;
    min-height: 0;
    margin-top: 12px;
  }
  .result-summary {
    font-size: 0.875rem;
    padding-top: 16px;
  }
  .demo-footer {
    flex-direction: column-reverse;
    align-items: stretch;
    gap: 15px;
    padding: 17px 20px;
  }
  .demo-footer .button {
    font-size: 13px;
    padding: 13px;
  }
  .demo-footer > p {
    font-size: 10px;
    line-height: 1.7;
    text-align: center;
  }
  .workflow-notes {
    grid-template-columns: 1fr;
    gap: 25px;
    margin-top: 31px;
  }
  .workflow-notes > div {
    grid-template-columns: 30px 1fr;
    gap: 0 14px;
  }
  .workflow-notes h3 {
    font-size: 0.875rem;
  }
  .workflow-notes p {
    font-size: 0.875rem;
    margin: 7px 0 0;
  }
  .workflow-notes p br {
    display: none;
  }
  .difference-inner {
    padding-block: 65px;
    gap: 30px;
  }
  .difference-copy {
    display: block;
  }
  .difference-copy h2 {
    font-size: 37px;
  }
  .difference-copy .section-description {
    font-size: 1rem;
    margin-top: 22px;
  }
  .difference-copy .eyebrow {
    font-size: 10px;
  }
  .difference-note {
    margin-top: 22px;
  }
  .comparison th,
  .comparison td {
    padding-block: 18px;
    padding-inline: 8px;
  }
  .applications {
    padding-block: 73px;
  }
  .use-cases {
    grid-template-columns: 1fr;
  }
  .use-card {
    padding: 24px 23px;
    border-right: 0;
    border-bottom: 1px solid #2a3623;
  }
  .use-card:nth-child(3) {
    border-bottom: 1px solid #2a3623;
  }
  .case-number {
    font-size: 10px;
  }
  .case-diagram {
    height: 130px;
    margin: 0 0 12px;
  }
  .use-card h3 {
    font-size: 20px;
  }
  .use-card > p {
    font-size: 1rem;
    max-width: 320px;
    margin-bottom: 20px;
  }
  .case-tag {
    font-size: 11px;
  }
  .routing-diagram {
    gap: 15px;
  }
  .flow-box {
    padding: 9px 12px;
  }
  .flow-box.small {
    padding: 3px 13px;
  }
  .realtime-diagram {
    gap: 8px;
  }
  .event-bar {
    width: 7px;
  }
  .data-rows {
    width: 75px;
  }
  .extraction-diagram {
    gap: 20px;
  }
  .matrix {
    grid-template-columns: repeat(3, 27px);
    font-size: 9px;
  }
  .matrix span {
    min-height: 24px;
  }
  .guardrail-diagram {
    gap: 23px;
  }
  .guard-text {
    font-size: 10px;
  }
  .guard-filter {
    font-size: 10px;
    padding: 0 13px;
  }
  .closing {
    padding-block: 56px;
  }
  .closing h2 {
    font-size: 33px;
    line-height: 1.45;
    letter-spacing: -1px;
    max-width: 360px;
    margin: auto;
  }
  .closing h2 span {
    display: block;
  }
  .closing > p:not(.eyebrow) {
    font-size: 13px;
    max-width: 270px;
    margin: 20px auto 28px;
  }
  .closing .button {
    font-size: 13px;
  }
  .closing-hint {
    font-size: 10px;
  }
  .site-footer {
    margin: 0 6%;
  }
  .footer-top {
    gap: 20px;
    padding: 27px 0;
  }
  .footer-top .brand {
    font-size: 29px;
  }
  .footer-top .brand-mark {
    font-size: 36px;
    margin-right: 7px;
  }
  .footer-top > span {
    font-size: 10px;
    max-width: 100px;
  }
  .footer-top > a:last-child {
    font-size: 11px;
  }
  .footer-bottom {
    font-size: 10px;
    row-gap: 14px;
  }
}
@media (max-width: 360px) {
  h1 {
    font-size: clamp(3.3rem, 16.5vw, 4.25rem);
  }
  .hero-actions {
    gap: 13px;
  }
  .hero-actions .button {
    font-size: 12px;
    padding: 13px;
  }
  .hero-actions .text-link {
    font-size: 11px;
  }
  .process-steps {
    gap: 5px;
    font-size: 9px;
  }
  .demo-grid {
    padding-inline: 16px;
  }
  .result-code {
    font-size: 11px;
  }
  .metric-value {
    font-size: 29px;
  }
  .section-heading h2 {
    font-size: 29px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .will-reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---- 手机保留跨页面入口，导航置于品牌行下方 ---- */
@media (max-width: 650px) {
  .site-header {
    height: auto;
    min-height: 76px;
    flex-wrap: wrap;
    padding-top: 17px;
    padding-bottom: 12px;
    gap: 15px;
  }
  .site-header nav {
    display: flex;
    order: 3;
    width: 100%;
    justify-content: space-between;
    gap: 14px;
    font-size: 13px;
    padding: 4px 0;
  }
  .site-header nav a {
    white-space: nowrap;
  }
}