/* ═══════════════════════════════════════════════════════════
   中天科技系統有限公司 — 響應式
   ═══════════════════════════════════════════════════════════ */

@media (max-width: 1240px){
  .container{ padding-inline: 28px; }

  .bento{ grid-template-columns: repeat(2, 1fr); }
  .bcard--lg{ grid-column: span 2; grid-row: auto; }
  .bcard--wide{ grid-column: span 2; }

  .infra-grid{ grid-template-columns: repeat(2, 1fr); }

  .footer-grid{ grid-template-columns: 1.4fr 1fr 1fr; }
  .footer-col--cta{ grid-column: span 3; }
  .footer-col--cta .btn{ max-width: 320px; }

  .case-hero{ gap: 40px; padding: 38px; }
  .case-hero-copy h3{ font-size: 28px; }
}

@media (max-width: 1080px){
  :root{ --nav-h: 70px; }

  .site-nav{ padding-inline: 18px; }
  .nav-logo img{ height: 40px; }
  .nav-menu{
    position: fixed;
    top: 92px;
    left: 18px;
    right: 18px;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 16px;
    border-radius: var(--r-xl);
    background: rgba(255,255,255,.96);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    backdrop-filter: blur(24px) saturate(180%);
    border: 1px solid rgba(255,255,255,.9);
    box-shadow: 0 30px 70px rgba(12,53,121,.18);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-14px) scale(.98);
    transform-origin: top center;
    transition: opacity 380ms var(--ease-elastic), transform 380ms var(--ease-elastic), visibility 380ms;
    max-height: calc(100vh - 130px);
    overflow-y: auto;
  }
  .nav-menu.is-open{ opacity: 1; visibility: visible; transform: none; }
  .nav-menu .nav-link{ padding: 14px 16px; font-size: 16px; width: 100%; }
  .nav-menu .nav-link:hover{ transform: none; background: var(--tech-3); }
  .nav-link::after{ display: none; }

  .nav-item--drop{ width: 100%; }
  .nav-link--btn{ justify-content: space-between; }
  .nav-dropdown{
    position: static;
    width: 100%;
    margin: 4px 0 8px;
    padding: 8px;
    transform: none;
    opacity: 1;
    visibility: visible;
    display: none;
    box-shadow: none;
    border: 0;
    background: #F6FAFE;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }
  .nav-item--drop.is-open .nav-dropdown{ display: block; }
  .nav-item--drop:hover .nav-dropdown{ transform: none; }

  .nav-burger{ display: block; }
  .lang-switch{ display: none; }

  .nav-cta{
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 12px;
    padding: 15px 22px;
    font-size: 16px;
    font-weight: 600;
    color: #fff;
    border-radius: var(--r-pill);
    background: linear-gradient(135deg, var(--brand-2), var(--brand));
    box-shadow: 0 14px 28px rgba(12, 53, 121, 0.24);
  }
  .nav-cta:hover{ box-shadow: 0 18px 36px rgba(0, 160, 233, 0.34); }

  .hero{ padding-top: calc(var(--nav-h) + 76px); }
  .hero-metrics{ grid-template-columns: repeat(2, 1fr); margin-top: 70px; }

  .problems-grid{ grid-template-columns: 1fr; gap: 50px; }
  .case-hero{ grid-template-columns: 1fr; }
  .ai-split{ grid-template-columns: 1fr; gap: 54px; }
  .ai-visual{ max-width: 640px; margin-inline: auto; }
  .ai-copy .sec-sub{ max-width: none; }
  /* 單欄時膠囊標籤略縮 */
  .ai-pill-i{ padding: 6px 12px 6px 10px; font-size: 12px; }
  .contact-grid{ grid-template-columns: 1fr; gap: 52px; }
  .why-bento{ grid-template-columns: repeat(2, 1fr); }
  .wcard--tall{ grid-row: auto; grid-column: span 2; }
  .wcard--wide{ grid-column: span 2; }
  .case-cards{ grid-template-columns: 1fr 1fr; }
  .case-cards .ccard:last-child{ grid-column: span 2; }

  .tl-nodes{ grid-template-columns: repeat(3, 1fr); gap: 26px 18px; }
  .tl-track{ top: 74px; height: 3px; }

  .float-chip{ display: none; }
  .phone{ width: 168px; }

  .case-hero{ border-radius: var(--r-xl); }
  .form{ padding: 28px 24px; }
}

@media (max-width: 760px){
  body{ font-size: 16px; }

  .container{ padding-inline: 20px; }
  .br-desk{ display: none; }

  .sec-head{ margin-bottom: 40px; }
  .sec-sub{ font-size: 16.5px; }

  .site-nav{ top: 12px; }
  .nav-inner{ padding: 8px 10px 8px 16px; gap: 16px; }
  .nav-logo img{ height: 38px; }
  .nav-actions{ gap: 8px; }
  .nav-actions .btn{ padding: 10px 15px; font-size: 13.5px; }
  .nav-burger{ width: 38px; height: 38px; padding: 11px 8px; }
  .nav-menu{ top: 82px; left: 12px; right: 12px; }

  .hero{ padding: calc(var(--nav-h) + 56px) 0 84px; }
  .hero-title{ font-size: clamp(30px, 8.4vw, 42px); }
  .hero-sub{ font-size: 16.5px; }
  .hero-cta{ gap: 12px; }
  .hero-cta .btn{ width: 100%; }
  .hero-metrics{ grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 56px; }
  .hero-metrics li{ padding: 20px 16px; }
  .hero-metrics b{ font-size: 30px; }
  .hero-metrics i{ font-size: 12.5px; }

  .hero-stage{ margin-top: 52px; }
  .float-chip{ display: none; }
  .phone{ right: -2%; width: 138px; bottom: -6%; }
  .stage-glow{ height: 300px; }

  .partners{ padding: 74px 0 40px; }
  .marquee{ margin-top: 34px; padding: 18px 0 30px; }
  .marquee-track{ animation-duration: 22s; }
  .pcard{ padding: 12px 20px 12px 12px; }
  .pmark{ width: 38px; height: 38px; font-size: 17px; border-radius: 12px; }
  .pname{ font-size: 13.5px; }
  .pname em{ font-size: 8.5px; }

  .services, .problems, .cases, .ai, .process, .why, .infra, .contact{ padding-block: 84px; }

  .bento{ grid-template-columns: 1fr; gap: 18px; }
  .bcard, .bcard--lg, .bcard--wide{ grid-column: span 1; }
  .bcard{ padding: 30px 26px; }
  .bcard--lg{ padding-bottom: 0; }
  .bcard--wide{ flex-direction: column; align-items: flex-start; }
  .bcard--wide .bcard-visual{ width: 100%; }
  .bcard h3{ font-size: 21px; }
  .bcard p{ font-size: 15px; }

  .pain-list li{ padding: 16px 18px; }
  .pain-list b{ font-size: 15.5px; }
  .pain-list i{ font-size: 13.5px; }
  .stack-stage{ min-height: 336px; }
  .stack-group{ width: 100%; height: 336px; }
  .stack-stage::before{ width: 520px; height: 300px; }

  .case-hero{ padding: 24px 20px 30px; gap: 30px; }
  .case-hero-copy h3{ font-size: 24px; }
  .case-hero-copy p{ font-size: 15px; }
  .case-facts{ gap: 22px; }
  .case-facts b{ font-size: 22px; }
  .case-cards{ grid-template-columns: 1fr; }
  .case-cards .ccard:last-child{ grid-column: span 1; }
  .shot-track{ height: 214px; }

  .ai-split{ gap: 42px; }
  .ai-feats{ gap: 15px; margin-top: 28px; }
  .ai-copy .btn{ margin-top: 32px; }
  .mb-grid{ gap: 6px; padding: 6px 7px 7px; }
  .mb-line, .mb-pie{ height: 38px; }

  .tl-nodes{ grid-template-columns: 1fr 1fr; gap: 30px 14px; }
  .tl-track{ display: none; }
  .tl-dot{ width: 60px; height: 60px; border-radius: 20px; }
  .tl-ico .ico--3d{ width: 34px; height: 34px; }
  .tl-node h3{ font-size: 15.5px; margin-top: 16px; }
  .tl-node p{ font-size: 13px; }

  .why-bento{ grid-template-columns: 1fr; gap: 18px; }
  .wcard--tall, .wcard--wide{ grid-column: span 1; }
  .wcard{ padding: 30px 26px; }
  .wcard--wide{ flex-direction: column; align-items: flex-start; }
  .wcard-num{ font-size: 56px; }

  .infra-grid{ grid-template-columns: 1fr; gap: 18px; }
  .icard{ padding: 28px 24px; }

  .contact-grid{ gap: 44px; }
  .form{ padding: 24px 18px; border-radius: var(--r-xl); }
  .form-row{ grid-template-columns: 1fr; gap: 0; }
  .faq-item summary{ padding: 18px 18px; font-size: 15.5px; }
  .faq-body > p{ padding-inline: 18px; font-size: 14.5px; }
  .faq-item[open] .faq-body > p{ padding: 0 18px 20px; }

  .footer{ padding: 68px 0 26px; }
  .footer-grid{ grid-template-columns: 1fr 1fr; gap: 34px 24px; }
  .footer-brand{ grid-column: span 2; }
  .footer-col--cta{ grid-column: span 2; }
  .footer-col--cta .btn{ max-width: none; }
  .footer-bottom{ flex-direction: column; align-items: flex-start; margin-top: 44px; }
  .footer-bottom ul{ gap: 18px; flex-wrap: wrap; }

  /* 右下角兩顆浮動按鈕：WhatsApp 在下、返回頂部在上，間距 16px */
  .wa-float{ right: 20px; bottom: 20px; width: 52px; height: 52px; }
  .wa-ico{ width: 26px; height: 26px; }
  .to-top{ right: 20px; bottom: 88px; width: 48px; height: 48px; }
  .toast{ left: 20px; right: 20px; bottom: 84px; transform: translateY(16px); text-align: center; }
  .toast.is-show{ transform: translateY(0); }
}

@media (max-width: 460px){
  .hero-metrics{ grid-template-columns: 1fr; }
  .tl-nodes{ grid-template-columns: 1fr; }
  .phone{ display: none; }
  .case-facts{ flex-direction: column; gap: 14px; }
  .footer-grid{ grid-template-columns: 1fr; }
  .footer-brand, .footer-col--cta{ grid-column: span 1; }
  .hero-badge{ font-size: 13px; padding: 8px 18px 8px 10px; }
  .hero-badge-dots i{ width: 19px; height: 19px; }
}

@media (max-width: 560px){
  /* 僅保留圓形閃電徽章（<picture> 已切換至 logo-mark.png），不遮擋漢堡菜單 */
  .nav-logo img{ height: 34px; }
  .nav-actions .btn{ display: none; }
  .nav-burger{ width: 36px; height: 36px; }
  .hero-badge{ font-size: 13.5px; }

  /* MacBook：螢幕改為兩欄，儀表盤與工作流佔滿整行 */
  .mb-grid{ grid-template-columns: 1fr 1fr; grid-template-rows: auto auto auto; }
  .mb-cell--dash{ grid-column: 1 / -1; }
  .mb-charts{ grid-template-columns: 1.6fr 1fr; }
  .mb-screen{ padding: 7px 7px 10px; }

  /* 膠囊標籤：縮小並收攏，避免遮擋螢幕內容 */
  .ai-pill-i{ padding: 5px 10px 5px 8px; font-size: 10.5px; gap: 4px; }
  .ai-pill-i .ico{ width: 10px; height: 10px; }
  .ai-pill--chat .ai-pill-i{ top: 20%; }
  .ai-pill--kb .ai-pill-i{ top: 6%; }
  .ai-pill--dash .ai-pill-i{ top: 62%; }
}

@media (max-width: 420px){
  .nav-logo img{ height: 32px; }
  .hero-title{ font-size: clamp(26px, 8vw, 34px); }
  .sec-title{ font-size: clamp(26px, 7.6vw, 34px); }

  /* 螢幕已很小，維持兩欄比單欄更可讀（單欄四段會被下緣裁切） */
  .mb-line, .mb-pie{ height: 34px; }
  .mb-top em{ font-size: 9.5px; }

  .ai-pill-i{ padding: 4px 9px 4px 7px; font-size: 10px; }
  .ai-pill-i .ico{ width: 9px; height: 9px; }
  .ai-pill--dash .ai-pill-i{ top: 58%; }
}

/* 觸控裝置：略過 hover 專屬動效，避免殘留狀態 */
@media (hover: none){
  .bcard:hover, .wcard:hover, .icard:hover, .ccard:hover, .pcard:hover{ transform: none; }
  .case-hero-visual:hover .case-laptop{ animation-play-state: running; }
  .case-hover-cta{ display: none; }
}

/* 窄屏：取消扇形展開，改為直列卡片，保留入場與漂浮節奏 */
@media (max-width: 700px){
  .stack-stage{ display: block; min-height: 0; }
  .stack-stage::before{ display: none; }
  .stack-group{
    position: static;
    display: grid;
    gap: 14px;
    width: auto;
    height: auto;
  }
  .stack-card{
    position: static;
    width: auto;
    height: auto;
    margin: 0;
  }
  .stack-card:nth-child(n){ --fx: 0px; --fy: 0px; --rot: 0deg; --cd: 0ms; }
  .js .stack-card{ transform: translate3d(0, 48px, 0) scale(.96); }
  .js .stack-group.is-in .stack-float{
    animation: none;
    transform: none;
  }
  .scard{ height: auto; padding: 22px 24px 20px; }
  .scard-num{ right: 20px; top: 22px; font-size: 22px; transform: none; }
  .scard h3{ font-size: 17px; }
  .scard p{ font-size: 13.5px; }
  .stack-note{ margin-top: 22px; }
}

/* 極窄屏（置於檔尾以確保覆蓋）：壓縮螢幕 UI，
   讓「智能客服／知識庫／商業助手／工作流自動化」四個面板在矮螢幕內仍完整呈現 */
@media (max-width: 460px){
  /* 矮螢幕略加高（16:13.2），讓四個面板完整呈現 */
  .mb-lid{ aspect-ratio: 16 / 13.2; }
  .mb-top{ padding: 3px 7px; }
  .mb-top em{ font-size: 9px; }
  .mb-live{ padding: 1px 6px; font-size: 8.5px; }
  .mb-grid{ gap: 3px; padding: 4px 5px 6px; }
  .mb-cell{ padding: 2px 4px 3px; gap: 2px; }
  .mb-cell-t{ font-size: 7.5px; }
  .mb-bub{ padding: 3px 6px; font-size: 8.5px; line-height: 1.45; }
  .mb-bub--done{ display: none; }                    /* 省略第三顆氣泡 */
  .mb-search{ padding: 4px 6px; font-size: 8.5px; }
  .mb-ai-tag{ padding: 2px 6px; font-size: 8px; }
  .mb-file{ padding: 3px 5px; font-size: 8px; }
  .mb-file-ico{ width: 11px; height: 11px; }
  .mb-files .mb-file:nth-child(2){ display: none; }  /* 省略第二個檔案 */
  .mb-metric b{ font-size: 11px; }
  .mb-metric i.mb-delta{ display: none; }            /* 省略增長標註 */
  .mb-charts{ grid-template-columns: 1.6fr 1fr; gap: 5px; }
  .mb-line, .mb-pie{ height: 26px; }
  .mb-flow{ gap: 3px; }
  .mb-node{ padding: 3px 5px; font-size: 8.5px; }
}