/* Apple-style design system — 2026 AI 模型月報
   Palette: #000 / #f5f5f7 / #1d1d1f / Apple Blue #0071e3
   Typography: system-ui (SF Pro substitute), negative tracking at every size. */

:root{
  /* ★ 2026-09-24 用戶要求「顏色柔和啲」：深底由純黑改深藍灰，主色由 Apple 藍改柔和藍 */
  --bg-light:#f6f7fa;
  --bg-dark:#171a20;
  --ink:#23262b;
  --ink-80:rgba(35,38,43,.82);
  --ink-48:rgba(35,38,43,.52);
  --blue:#3b76d1;
  --link:#2f6ac0;
  --link-dark:#8fb8ee;
  --surface-dark:#232830;
  --surface-dark-2:#1c2027;
  --line:rgba(28,45,80,.10);
  --shadow:0 6px 24px rgba(28,45,80,.10);
  --maxw:980px;
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue","Microsoft JhengHei","PingFang HK","Noto Sans TC",Arial,sans-serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;font-family:var(--font);color:var(--ink);background:var(--bg-light);
  font-size:17px;line-height:1.47;letter-spacing:-.374px;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:var(--link);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}
.wrap-wide{max-width:1180px;margin:0 auto;padding:0 22px}

/* ---------- nav (glass) ---------- */
nav{
  position:sticky;top:0;z-index:50;height:48px;display:flex;align-items:center;
  background:rgba(0,0,0,.8);backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
}
nav .wrap-wide{display:flex;align-items:center;gap:22px;width:100%}
nav a{color:#fff;font-size:12px;letter-spacing:-.12px;opacity:.86}
nav a:hover{opacity:1;text-decoration:none}
nav .brand{font-weight:600;font-size:14px;letter-spacing:-.2px}
nav .lang{margin-left:auto;color:#fff;font-size:12px;opacity:.7}

/* ---------- sections ---------- */
section{padding:88px 0}
section.dark{background:var(--bg-dark);color:#fff}
section.dark a{color:var(--link-dark)}
section.light{background:var(--bg-light);color:var(--ink)}
section.white{background:#fff;color:var(--ink)}
section.tight{padding:56px 0}

.eyebrow{font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-48);margin:0 0 14px}
section.dark .eyebrow{color:rgba(255,255,255,.5)}
h1{font-size:56px;line-height:1.07;letter-spacing:-.28px;font-weight:600;margin:0 0 18px}
h2{font-size:40px;line-height:1.1;letter-spacing:-.24px;font-weight:600;margin:0 0 16px}
h3{font-size:28px;line-height:1.14;letter-spacing:.196px;font-weight:600;margin:0 0 10px}
h4{font-size:21px;line-height:1.19;letter-spacing:.231px;font-weight:600;margin:0 0 8px}
p{margin:0 0 14px;color:var(--ink-80)}
section.dark p{color:rgba(255,255,255,.86)}
.lead{font-size:21px;line-height:1.4;font-weight:400;letter-spacing:.12px}
.center{text-align:center}
.en{display:block;font-size:14px;line-height:1.43;letter-spacing:-.224px;color:var(--ink-48);margin-top:4px;font-weight:400}
section.dark .en{color:rgba(255,255,255,.55)}
.lead .en{font-size:15px;margin-top:6px}
h1 .en,h2 .en{font-size:.42em;line-height:1.3;letter-spacing:-.1px;margin-top:10px;font-weight:400}

/* ---------- pills & buttons ---------- */
.pill{
  display:inline-block;border:1px solid currentColor;border-radius:980px;
  padding:9px 20px;font-size:14px;letter-spacing:-.224px;margin:8px 10px 0 0;
}
.pill:hover{text-decoration:none;opacity:.75}
.pill.solid{background:var(--blue);border-color:var(--blue);color:#fff}
.pill.solid:hover{background:#0077ed;opacity:1}

/* ---------- grids ---------- */
.grid{display:grid;gap:18px}
.grid > *{min-width:0}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}
.g3{grid-template-columns:repeat(3,minmax(0,1fr))}
.g4{grid-template-columns:repeat(4,minmax(0,1fr))}

/* ---------- cards ---------- */
/* ★ 2026-09-24：白色 section 上嘅卡要有可見邊界（之前白卡喺白底＝睇唔到邊格打邊格） */
.card{
  background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px;
  box-shadow:0 2px 10px rgba(28,45,80,.05);
}
section.white .card{background:#f7f8fb;border-color:rgba(28,45,80,.09);box-shadow:none}
section.dark .card{background:var(--surface-dark);border-color:rgba(255,255,255,.09);color:#fff}
section.dark .card p{color:rgba(255,255,255,.82)}
.card.plain{background:#fff;box-shadow:var(--shadow)}
section.dark .card.plain{background:var(--surface-dark)}
.card h4{margin-bottom:6px}
.num{font-size:12px;font-weight:600;color:var(--blue);letter-spacing:.04em;display:block;margin-bottom:8px}

/* ---------- figures / concept graphics ---------- */
figure{margin:0}
.shot{
  margin:26px 0 0;background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;
  box-shadow:0 4px 18px rgba(28,45,80,.06);
}
.shot img{width:100%;height:auto;display:block}
.shot figcaption{font-size:13px;color:var(--ink-48);padding:12px 16px;border-top:1px solid var(--line);background:#fbfcfe}

/* ---------- tier strip ---------- */
.tier{border-radius:12px;padding:26px;background:#fff}
.tier h4{font-size:21px}
.tier .big{font-size:34px;font-weight:600;letter-spacing:-.4px;line-height:1.1;margin:6px 0 12px}
.tier ul{margin:10px 0 0;padding-left:18px}
.tier li{margin:6px 0;color:var(--ink-80);font-size:15px}
section.dark .tier{background:var(--surface-dark)}
section.dark .tier li{color:rgba(255,255,255,.84)}

/* ---------- month timelines ---------- */
.month{margin-top:34px}
.month-head{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;margin-bottom:6px}
.month-head h3{margin:0}
.month-head span{font-size:13px;color:var(--ink-48)}
section.dark .month-head span{color:rgba(255,255,255,.5)}
table.spec{width:100%;border-collapse:collapse;margin:12px 0 4px;font-size:14px;letter-spacing:-.1px}
table.spec th,table.spec td{text-align:left;padding:8px 10px 8px 0;vertical-align:top;border-bottom:1px solid rgba(0,0,0,.09)}
section.dark table.spec th,section.dark table.spec td{border-bottom-color:rgba(255,255,255,.14)}
table.spec th{font-weight:600;width:34%;color:var(--ink);font-size:13px}
section.dark table.spec th{color:#fff}
table.spec td{color:var(--ink-80)}
section.dark table.spec td{color:rgba(255,255,255,.82)}
.tag{
  display:inline-block;font-size:11px;letter-spacing:.02em;border-radius:980px;
  padding:3px 10px;margin:0 6px 6px 0;background:rgba(0,0,0,.06);color:var(--ink-80);
}
section.dark .tag{background:rgba(255,255,255,.12);color:#fff}
.tag.blue{background:rgba(0,113,227,.12);color:#0058b0}
.tag.warn{background:rgba(255,149,0,.16);color:#8a4b00}
.src{font-size:12px;color:var(--ink-48);letter-spacing:-.12px;margin-top:8px}
section.dark .src{color:rgba(255,255,255,.45)}

/* ---------- steps ---------- */
ol.steps{padding-left:0;counter-reset:s;list-style:none;margin:14px 0 0}
ol.steps li{counter-increment:s;position:relative;padding-left:42px;margin:14px 0;color:var(--ink-80)}
section.dark ol.steps li{color:rgba(255,255,255,.86)}
ol.steps li::before{
  content:counter(s);position:absolute;left:0;top:1px;width:26px;height:26px;border-radius:50%;
  background:var(--blue);color:#fff;font-size:13px;font-weight:600;display:flex;align-items:center;justify-content:center;
}
code,kbd{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;font-size:13px}
pre{
  background:#1d1d1f;color:#f5f5f7;border-radius:8px;padding:14px 16px;overflow-x:auto;
  font-size:13px;line-height:1.6;margin:10px 0;
}
pre code{white-space:pre-wrap;word-break:break-word}
.kbd{background:rgba(0,0,0,.06);border-radius:6px;padding:2px 6px;font-size:13px}
section.dark .kbd{background:rgba(255,255,255,.12)}

/* ---------- details / faq ---------- */
details{border-bottom:1px solid rgba(0,0,0,.12);padding:16px 0}
details summary{cursor:pointer;font-size:19px;font-weight:600;letter-spacing:-.2px;list-style:none}
details summary::-webkit-details-marker{display:none}
details summary::after{content:"＋";float:right;color:var(--ink-48);font-weight:400}
details[open] summary::after{content:"－"}
details .en{margin-top:2px}

/* ---------- footer ---------- */
footer{background:var(--bg-light);padding:52px 0 70px;font-size:13px;color:var(--ink-48);letter-spacing:-.12px}
footer a{color:var(--link)}
footer .flinks{display:flex;flex-wrap:wrap;gap:22px;margin:18px 0}
.disclaimer{margin-top:24px;font-size:12px;line-height:1.6;color:var(--ink-48)}

/* ---------- responsive ---------- */
@media (max-width:834px){
  h1{font-size:40px}
  h2{font-size:32px}
  h3{font-size:24px}
  section{padding:64px 0}
  .g3,.g4{grid-template-columns:repeat(2,minmax(0,1fr))}
  nav .wrap-wide{gap:14px;overflow-x:auto}
  nav .lang{display:none}
}
@media (max-width:560px){
  body{font-size:16px}
  h1{font-size:32px;letter-spacing:-.2px}
  h2{font-size:26px}
  .lead{font-size:18px}
  .g2,.g3,.g4{grid-template-columns:minmax(0,1fr)}
  section{padding:52px 0}
  .wrap,.wrap-wide{padding:0 18px}
  table.spec th{width:40%}
}

/* ---------- 「同月其他發布」精簡清單 ---------- */
.morebox{margin-top:26px;background:#fff;border-radius:12px;padding:22px 26px}
section.dark .morebox{background:var(--surface-dark)}
.morebox h4{margin-bottom:12px}
.morelist{margin:0;padding-left:20px}
.morelist li{margin:8px 0;color:var(--ink-80);font-size:15px;line-height:1.42}
section.dark .morelist li{color:rgba(255,255,255,.84)}
.morelist strong{font-weight:600}
.morelist .en{font-size:13px;margin-top:1px}

/* ---------- 320px 防溢出（實測 2026-09-23：長網址／連續英數唔識斷行） ---------- */
.src,.src a{word-break:break-all;overflow-wrap:anywhere}
.card,.tier,.morebox,table.spec td,.morelist li,.lead,.en,footer p{overflow-wrap:anywhere}
code,pre code{overflow-wrap:anywhere;word-break:break-word}

/* ---------- 聯絡區 ---------- */
.contactbox{background:var(--surface-dark);border-radius:12px;padding:26px}
.pillrow{margin:6px 0 14px}
#contact .card h4{margin-bottom:8px}

/* ---------- whynoideas 服務頁專用 ---------- */
.hero-line{display:flex;flex-wrap:wrap;gap:10px;margin-top:8px}
.stepnum{display:flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:50%;
  background:var(--blue);color:#fff;font-weight:600;font-size:15px;margin-bottom:12px}
.qbox{background:#fff;border-radius:12px;padding:24px}
section.dark .qbox{background:var(--surface-dark)}
.qbox h4{margin-bottom:8px}
.factline{display:flex;gap:12px;align-items:flex-start;margin:14px 0}
.factline .dot{flex:0 0 8px;height:8px;border-radius:50%;background:var(--blue);margin-top:8px}
.factline p{margin:0}
.cta{background:linear-gradient(180deg,#4c84d6 0%,#3a6fc4 100%);color:#fff;border-radius:16px;padding:34px;text-align:center;
  box-shadow:0 8px 26px rgba(40,70,130,.18)}
.cta h3{color:#fff}
.cta p{color:rgba(255,255,255,.9)}
/* ★ 2026-09-24 用戶反映「睇唔到邊一格打邊一格」：
   藍底上嘅 .pill 用咗 a{color:var(--link)} ＝藍字藍框藍底，完全分唔開。
   下面把 CTA 內嘅按鈕改成「白色實心主掣 + 半透明白框次掣」，每格有明顯邊界。 */
.cta .pill{
  border:1px solid rgba(255,255,255,.72);
  background:rgba(255,255,255,.12);
  color:#fff;
  font-weight:500;
  padding:11px 22px;
  margin:8px 6px 0;
}
.cta .pill:hover{background:rgba(255,255,255,.24);opacity:1}
.cta .pill.solid{
  background:#fff;border-color:#fff;color:var(--blue);font-weight:600;
}
.cta .pill.solid:hover{background:#eef4ff;opacity:1}
.cta .legal{color:rgba(255,255,255,.78)}
.cta .limit{border-color:rgba(255,255,255,.65)}
.limit{display:inline-block;font-size:12px;letter-spacing:.04em;border:1px solid rgba(255,255,255,.5);
  border-radius:980px;padding:4px 12px;margin-bottom:14px}
.legal{font-size:12px;color:var(--ink-48);line-height:1.6}