:root{
  --bg:#f4f1ea;
  --bg-2:#edf3f1;
  --paper:#fffdf7;
  --paper-2:#f8f4ea;
  --surface:#ffffff;
  --surface-soft:#f7fbfa;
  --ink:#172130;
  --ink-2:#253446;
  --muted:#56677a;
  --muted-2:#6e7d8e;
  --navy:#10243c;
  --navy-2:#173654;
  --teal:#1e5963;
  --teal-2:#2b7480;
  --gold:#b9822d;
  --gold-soft:#f5e7ca;
  --line:#d8dfdf;
  --line-strong:#bccaca;
  --shadow:0 18px 48px rgba(23,33,48,.10);
  --shadow-soft:0 10px 28px rgba(23,33,48,.07);
  --radius:20px;
  --radius-sm:14px;
  --measure:72ch;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;text-size-adjust:100%}
html,body{margin:0;padding:0}
body{
  font:16px/1.72 "Atkinson Hyperlegible","Aptos","IBM Plex Sans","Segoe UI",sans-serif;
  color:var(--ink);
  background:
    radial-gradient(circle at 10% -8%, rgba(43,116,128,.16) 0 15rem, transparent 28rem),
    radial-gradient(circle at 92% 8%, rgba(185,130,45,.14) 0 11rem, transparent 24rem),
    linear-gradient(180deg,var(--bg) 0%,#f8faf8 46%,#eef4f3 100%);
  min-height:100vh;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  opacity:.34;
  background-image:
    linear-gradient(rgba(23,33,48,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23,33,48,.035) 1px, transparent 1px);
  background-size:44px 44px;
  mask-image:linear-gradient(180deg,rgba(0,0,0,.7),transparent 70%);
}

.wrap{width:min(1120px,calc(100% - 36px));margin-inline:auto;padding-inline:0}
a{color:var(--teal);text-underline-offset:.18em}
a:hover{color:var(--navy)}
img,svg{max-width:100%;height:auto}
::selection{background:#dcefe9;color:var(--ink)}

header{
  position:sticky;
  top:0;
  z-index:60;
  padding:.7rem 0 .8rem;
  background:rgba(244,241,234,.86);
  backdrop-filter:blur(18px);
  border-bottom:1px solid rgba(188,202,202,.62);
}
.topbar{
  min-height:62px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  background:linear-gradient(135deg,rgba(255,253,247,.98),rgba(247,251,250,.96));
  border:1px solid rgba(188,202,202,.88);
  border-bottom:0;
  border-radius:22px 22px 0 0;
  padding:.62rem .95rem .48rem;
  box-shadow:0 10px 28px rgba(23,33,48,.08);
}
.brand{display:inline-flex;align-items:center;text-decoration:none;min-width:0}
.brand img{display:block;height:42px;width:auto;filter:drop-shadow(0 3px 8px rgba(23,33,48,.08))}
.topbar-call{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:42px;
  padding:.6rem 1rem;
  border-radius:999px;
  background:var(--navy);
  border:1px solid rgba(255,255,255,.16);
  color:#fff;
  text-decoration:none;
  font-weight:800;
  letter-spacing:.01em;
  box-shadow:0 12px 28px rgba(16,36,60,.22);
  white-space:nowrap;
}
.topbar-call:hover{background:var(--teal);color:#fff}
nav.wrap{
  display:flex;
  align-items:center;
  gap:.3rem;
  flex-wrap:wrap;
  padding:.54rem .78rem .68rem;
  background:rgba(255,253,247,.98);
  border:1px solid rgba(188,202,202,.88);
  border-top:0;
  border-radius:0 0 22px 22px;
  box-shadow:0 14px 30px rgba(23,33,48,.08);
}
nav a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:.46rem .72rem;
  border-radius:999px;
  color:#334457;
  text-decoration:none;
  font-size:.94rem;
  font-weight:760;
  border:1px solid transparent;
}
nav a:hover,
nav a:focus-visible{background:#edf4f2;color:var(--navy);border-color:#d4e1de;outline:none}
.lang-switcher{
  margin-left:auto;
  min-height:40px;
  border:1px solid #c8d4d2;
  background:#fff;
  color:var(--ink);
  border-radius:999px;
  padding:.5rem .9rem;
  font:750 .92rem/1.2 "Atkinson Hyperlegible","Aptos",sans-serif;
}
.lang-switcher:focus{outline:none;border-color:var(--teal);box-shadow:0 0 0 4px rgba(30,89,99,.14)}

main{padding:2rem 0 3.3rem}
.breadcrumbs{
  display:flex;
  flex-wrap:wrap;
  gap:.42rem;
  align-items:center;
  margin:0 0 1rem;
  color:var(--muted-2);
  font-size:.92rem;
}
.breadcrumbs a{color:#405065;text-decoration:none;font-weight:750}
.breadcrumbs a:hover{text-decoration:underline;color:var(--navy)}
.breadcrumbs span:last-child{color:var(--ink-2);font-weight:800}

h1,h2,h3{
  margin:.08rem 0 .76rem;
  color:var(--ink);
  line-height:1.12;
  letter-spacing:-.026em;
  font-family:"Charter","Iowan Old Style","Source Serif 4",Georgia,serif;
  text-wrap:balance;
}
h1{font-size:clamp(2rem,4.8vw,2.95rem);font-weight:760;max-width:13ch}
h2{font-size:clamp(1.38rem,2.4vw,2.05rem);font-weight:750}
h3{font-size:1.08rem;font-weight:760;letter-spacing:-.012em}
p,li{color:var(--muted)}
p{margin:0 0 1rem}
ul,ol{margin-top:.3rem}
main > p,
main > ul,
main > ol,
section > p,
section > ul,
section > ol{max-width:var(--measure)}

.hero{
  position:relative;
  overflow:hidden;
  border:1px solid rgba(23,54,84,.28);
  border-radius:28px;
  padding:clamp(1.2rem,2.3vw,2.15rem);
  background:
    linear-gradient(140deg,rgba(16,36,60,.98) 0%,rgba(20,55,81,.98) 55%,rgba(30,89,99,.94) 100%);
  box-shadow:0 26px 70px rgba(16,36,60,.22);
  isolation:isolate;
}
.hero::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:-1;
  background:
    linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 1px),
    linear-gradient(rgba(255,255,255,.055) 1px,transparent 1px),
    radial-gradient(circle at 82% 14%,rgba(246,231,196,.22),transparent 22rem);
  background-size:56px 56px,56px 56px,auto;
  opacity:.72;
}
.hero::after{
  content:"";
  position:absolute;
  right:-5.2rem;
  bottom:-6.2rem;
  width:17rem;
  height:17rem;
  border-radius:50%;
  border:42px solid rgba(255,255,255,.065);
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.08);
  pointer-events:none;
}
.hero-premium{padding:clamp(1.28rem,2.6vw,2.3rem)}
.hero-split{
  display:grid;
  grid-template-columns:minmax(0,1.08fr) minmax(290px,.72fr);
  gap:clamp(1rem,2.4vw,1.55rem);
  align-items:start;
}
.hero-main{display:flex;flex-direction:column;gap:.2rem;position:relative;z-index:1}
.hero-main h1,
.hero-main h2,
.hero-main h3{color:#fffdf7}
.hero-main h1{max-width:12.8ch;margin-top:.25rem}
.hero-main p,
.hero-main li,
.hero-main .eyebrow,
.hero-main .small{color:rgba(245,248,247,.9)}
.hero-main > p:not(.eyebrow):first-of-type{font-size:1.02rem;line-height:1.72;max-width:58ch}
.eyebrow{
  display:inline-flex;
  align-self:flex-start;
  align-items:center;
  gap:.5rem;
  margin:0 0 .55rem;
  color:#f5e7ca;
  font-size:.74rem;
  font-weight:850;
  letter-spacing:.15em;
  text-transform:uppercase;
}
.eyebrow::before{content:"";width:2.2rem;height:1px;background:currentColor;opacity:.8}
.hero-panel{
  position:relative;
  z-index:1;
  padding:1.05rem;
  border-radius:22px;
  background:linear-gradient(180deg,rgba(255,253,247,.98),rgba(246,249,248,.98));
  border:1px solid rgba(255,255,255,.68);
  box-shadow:0 22px 48px rgba(7,17,29,.20);
}
.hero-panel h2,.hero-panel h3{font-size:1.04rem;margin-bottom:.55rem;color:var(--ink)}
.hero-panel p{font-size:.94rem;line-height:1.63}
.hero-points{list-style:none;padding:0;margin:0;display:grid;gap:.7rem}
.hero-points li{
  position:relative;
  padding:.78rem .84rem .78rem 1rem;
  border-radius:16px;
  background:#fff;
  border:1px solid #dce6e4;
  color:#435469;
}
.hero-points li::before{
  content:"";
  position:absolute;
  inset:.78rem auto auto 0;
  width:4px;
  height:2.3rem;
  border-radius:999px;
  background:linear-gradient(180deg,var(--gold),var(--teal));
}
.hero-points strong{display:block;margin-bottom:.18rem;color:var(--ink)}
.hero-mini-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.7rem;margin-top:.85rem}
.hero-mini-grid article{
  padding:.82rem .86rem;
  border-radius:16px;
  background:#f6faf9;
  border:1px solid #dce6e4;
}
.hero-mini-grid h3{margin:0 0 .3rem;font-family:"Atkinson Hyperlegible","Aptos",sans-serif;font-size:.95rem;letter-spacing:0}
.hero-mini-grid p{margin:0;font-size:.94rem}

.trust-strip{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:.7rem;
  margin:1rem 0 0;
  padding:0;
  background:transparent;
  border:0;
  border-radius:0;
  box-shadow:none;
}
.trust-strip::after{display:none}
.trust-strip span{
  min-height:82px;
  display:flex;
  align-items:center;
  padding:.9rem .95rem;
  border-radius:18px;
  background:rgba(255,253,247,.92);
  border:1px solid rgba(188,202,202,.78);
  color:#35475b;
  font-size:.88rem;
  font-weight:800;
  box-shadow:var(--shadow-soft);
}

section{
  position:relative;
  overflow:hidden;
  margin:1.1rem 0;
  padding:clamp(1.18rem,2.2vw,1.7rem);
  border-radius:24px;
  background:rgba(255,253,247,.96);
  border:1px solid rgba(188,202,202,.82);
  box-shadow:var(--shadow-soft);
}
section::before{
  content:"";
  position:absolute;
  inset:0 auto 0 0;
  width:5px;
  background:linear-gradient(180deg,var(--teal),rgba(43,116,128,.10));
  opacity:.8;
}
section::after{
  content:"";
  position:absolute;
  top:-5rem;
  right:-5rem;
  width:13rem;
  height:13rem;
  border-radius:50%;
  background:radial-gradient(circle,rgba(30,89,99,.10),rgba(30,89,99,0) 70%);
  pointer-events:none;
}
section > *{position:relative;z-index:1}
section ul,section ol{padding-left:1.25rem}
section li+li{margin-top:.46rem}
.section-kicker{
  display:inline-flex;
  align-items:center;
  gap:.55rem;
  margin:0 0 .72rem;
  color:#667789;
  font-size:.75rem;
  font-weight:850;
  letter-spacing:.145em;
  text-transform:uppercase;
}
.section-kicker::before{content:"";width:2.1rem;height:1px;background:var(--gold)}

.editorial-note{
  background:linear-gradient(135deg,#fffdf7 0%,#f1f7f5 100%);
  border-color:#d4dedb;
}
.editorial-note::before{background:linear-gradient(180deg,var(--gold),var(--teal))}
.editorial-note__disclaimer{margin-bottom:0;color:#2b3b4f;font-weight:760}

.summary-shell{display:grid;grid-template-columns:minmax(0,1.26fr) minmax(270px,.82fr);gap:1rem;align-items:start}
.summary-panel,
.process-card,
.problem-card,
.card-link,
.question-link,
.lead-list article,
.card,
.callout,
.form-card,
.info-card,
.official-context,
.visual-figure,
.article-visual{
  border:1px solid #d9e4e2;
  border-radius:18px;
  background:#fff;
}
.summary-panel{padding:1rem 1rem 1.05rem;background:linear-gradient(180deg,#ffffff,#f7fbfa)}
.summary-panel h3{margin:0 0 .55rem;font-family:"Atkinson Hyperlegible","Aptos",sans-serif;letter-spacing:0}
.summary-panel ul{margin:.28rem 0 0;padding-left:1.1rem}
.summary-panel li{color:#405269}

.grid-cards,.quick-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.85rem}
.quick-links{margin-top:.85rem}
.process-grid,.problem-grid,.question-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.85rem;margin-top:1rem}
.process-grid{margin:1rem 0 1.15rem}
.process-card,.problem-card,.lead-list article,.card{padding:1rem}
.process-card,.problem-card{
  background:linear-gradient(180deg,#fff 0%,#f8fbfa 100%);
  box-shadow:0 8px 18px rgba(23,33,48,.045);
}
.process-card h3,.problem-card h3,.lead-list h3,.card h3{font-family:"Atkinson Hyperlegible","Aptos",sans-serif;letter-spacing:-.01em}
.process-card p,.problem-card p,.lead-list p{margin:0}
.card-link,
.question-link{
  display:block;
  text-decoration:none;
  padding:1rem;
  color:inherit;
  transition:transform .16s ease,box-shadow .16s ease,border-color .16s ease,background .16s ease;
}
.question-link{display:flex;flex-direction:column;gap:.35rem;min-height:100%}
.card-link h3,.question-link strong,.lead-list h3{margin:0 0 .35rem;color:var(--ink)}
.card-link p,.question-link span{margin:0;color:#56677a}
.card-link:hover,
.question-link:hover{
  transform:translateY(-2px);
  border-color:#a9bfbd;
  background:#fbfdfc;
  box-shadow:0 16px 30px rgba(23,33,48,.09);
}
.lead-list{display:grid;gap:.68rem;margin-top:1rem}

.official-context{
  padding:1.05rem;
  background:linear-gradient(135deg,#edf6f3 0%,#fffdf7 100%);
  border-color:#cfe0dc;
  box-shadow:0 12px 28px rgba(23,33,48,.06);
}
.official-context ul{margin:.75rem 0 0;padding-left:1.2rem}
.official-context li+li{margin-top:.45rem}
.official-context a{font-weight:800}

.cta{display:flex;gap:.7rem;flex-wrap:wrap;margin-top:.9rem}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.42rem;
  min-height:44px;
  padding:.7rem 1.05rem;
  border-radius:999px;
  background:linear-gradient(135deg,var(--teal),var(--navy));
  color:#fff;
  text-decoration:none;
  font-weight:850;
  border:1px solid rgba(255,255,255,.14);
  box-shadow:0 12px 28px rgba(16,36,60,.18);
}
.btn:hover{background:linear-gradient(135deg,var(--navy),#0b1a2c);color:#fff}
.btn.alt{background:#fffdf7;color:var(--navy);border:1px solid #d1dcd9;box-shadow:none}
.btn.alt:hover{background:#f5eee0;color:var(--navy)}
.hero .btn{background:#fffdf7;color:var(--navy);box-shadow:0 12px 24px rgba(0,0,0,.18)}
.hero .btn.alt{background:rgba(255,255,255,.08);color:#fff;border-color:rgba(255,255,255,.32)}
.hero .btn:hover{background:#f5e7ca;color:var(--navy)}
.hero .btn.alt:hover{background:rgba(255,255,255,.16);color:#fff}

.callout{
  padding:1rem 1.05rem;
  background:linear-gradient(135deg,#fffdf7,#f3faf7);
  border-left:5px solid var(--teal);
}
.small{font-size:.92rem;color:#6a7888}
.hero .small{font-size:.9rem;color:rgba(255,255,255,.78)}

.contact-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:1rem;align-items:start}
.form-card,.info-card{padding:1.12rem;box-shadow:0 8px 20px rgba(23,33,48,.05)}
.form-row{display:grid;gap:.38rem;margin-bottom:.85rem}
.form-row label{font-weight:800;color:#2b3b4f;font-size:.92rem}
.form-row input,.form-row textarea,.form-row select{
  width:100%;
  border:1px solid #c8d6d4;
  border-radius:14px;
  padding:.72rem .8rem;
  font:inherit;
  color:var(--ink);
  background:#fff;
}
.form-row textarea{min-height:132px;resize:vertical}
.form-row input:focus,.form-row textarea:focus,.form-row select:focus{outline:none;border-color:var(--teal);box-shadow:0 0 0 4px rgba(30,89,99,.13)}
.notice{border:1px solid #9dd8b5;background:#effbf3;color:#166534;padding:.78rem .9rem;border-radius:14px;margin:.9rem 0;font-weight:750}
.notice.error{border-color:#efb7b7;background:#fff2f2;color:#8b1a1a}

.article-visual,
.visual-figure{
  clear:both;
  width:100%;
  max-width:min(100%,72ch);
  margin:1.05rem auto 0;
  position:relative;
  z-index:0;
  isolation:isolate;
  overflow:hidden;
  box-shadow:0 14px 32px rgba(23,33,48,.08);
  background:#fff;
}
.visual-support-copy{
  margin:.85rem 0 0;
  padding:.78rem .95rem;
  border-left:4px solid var(--teal);
  border-radius:12px;
  background:#f4faf8;
  color:#385261;
  font-size:.96rem;
  line-height:1.62;
}
.article-visual__media{width:100%;max-width:100%;overflow:hidden;background:#edf4f2}
.article-visual img,
.article-visual svg,
.visual-figure img,
.visual-figure svg{display:block;width:100%;max-width:100%;height:auto !important}
.article-visual svg,.visual-figure svg{overflow:hidden}
.article-visual figcaption,.visual-figure figcaption{padding:.82rem 1rem 1rem;color:#657486;font-size:.93rem;line-height:1.62;background:#fffdf7;border-top:1px solid #e2e8e6}
.article-visual *, .visual-figure *{max-width:100%}
.article-visual--compact{max-width:min(100%,56ch)}


.visual-task-panel{
  display:grid;
  grid-template-columns:minmax(0,.95fr) minmax(300px,1.05fr);
  gap:1rem;
  align-items:center;
  padding:1.05rem;
  background:linear-gradient(135deg,#f6fbfa 0%,#fffdf7 100%);
  border:1px solid #d2e1de;
  border-radius:20px;
  box-shadow:0 14px 32px rgba(23,33,48,.07);
}
.visual-task-panel .article-visual{margin:0;max-width:100%}
.visual-task-panel__copy{min-width:0}
.visual-task-panel__copy p:last-child{margin-bottom:0}
.visual-task-panel__chips{display:flex;flex-wrap:wrap;gap:.45rem;margin:.75rem 0 .15rem;padding:0;list-style:none}
.visual-task-panel__chips li{margin:0;padding:.36rem .58rem;border:1px solid #cfdedb;border-radius:999px;background:#fff;color:#385261;font-size:.88rem;font-weight:800}
@media (max-width:760px){.visual-task-panel{grid-template-columns:1fr;padding:.85rem}.visual-task-panel .article-visual{order:2}.visual-task-panel__chips li{font-size:.84rem}}

footer{
  margin-top:2rem;
  background:linear-gradient(135deg,#0e2138,#10243c 55%,#153f49);
  color:#e8efef;
  border-top:1px solid rgba(255,255,255,.12);
}
footer .wrap{padding-top:1.35rem;padding-bottom:1.55rem}
footer p{margin:.42rem 0;color:#e8efef}
footer a{color:#f5e7ca}

:lang(zh-Hans),:lang(zh-Hant),:lang(ja),:lang(ko){font-family:"Noto Sans CJK SC","Noto Sans CJK TC","Noto Sans JP","Noto Sans KR","Atkinson Hyperlegible","Aptos",sans-serif}
:lang(zh-Hans) h1,:lang(zh-Hans) h2,:lang(zh-Hans) h3,
:lang(zh-Hant) h1,:lang(zh-Hant) h2,:lang(zh-Hant) h3,
:lang(ja) h1,:lang(ja) h2,:lang(ja) h3,
:lang(ko) h1,:lang(ko) h2,:lang(ko) h3{font-family:"Noto Serif CJK SC","Noto Serif CJK TC","Noto Serif JP","Noto Serif KR",serif;letter-spacing:0;line-height:1.24}

@media (max-width:980px){
  .hero-split,.summary-shell,.contact-grid{grid-template-columns:1fr}
  .trust-strip,.grid-cards,.quick-links,.process-grid,.problem-grid,.question-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  h1{max-width:18ch}
  .hero-main h1{max-width:16ch}
}

@media (max-width:760px){
  body{font-size:15.5px;line-height:1.68}
  .wrap{width:min(100% - 28px,1120px)}
  header{position:relative;padding:.5rem 0 .65rem}
  .topbar{min-height:58px;border-radius:18px 18px 0 0;padding:.55rem .72rem .42rem}
  .brand img{height:36px}
  .topbar-call{min-height:38px;font-size:.82rem;padding:.5rem .7rem}
  nav.wrap{padding:.52rem .64rem .66rem;border-radius:0 0 18px 18px;gap:.24rem}
  nav a{min-height:36px;font-size:.91rem;padding:.38rem .55rem}
  .lang-switcher{margin-left:0;width:100%;margin-top:.35rem;border-radius:14px}
  main{padding-top:1.1rem;padding-bottom:2rem}
  h1{font-size:clamp(1.78rem,8.4vw,2.34rem)}
  h2{font-size:clamp(1.32rem,6vw,1.72rem)}
  section,.hero{padding:1rem;border-radius:18px}
  section::before{width:4px}
  .hero{box-shadow:0 18px 40px rgba(16,36,60,.18)}
  .hero-main h1{max-width:100%}
  .trust-strip,.hero-mini-grid,.grid-cards,.quick-links,.process-grid,.problem-grid,.question-grid,.contact-grid{grid-template-columns:1fr}
  .trust-strip{margin:.8rem 0 0}
  .trust-strip span{min-height:auto}
  .article-visual,.visual-figure{margin:1rem auto 0;border-radius:16px}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
}

/* GPT-5.5 theme refinement: keep the authority look without oversized headline blocks. */
html,body{max-width:100%;overflow-x:hidden}
header,.wrap,.hero,.hero-main,.hero-panel,section,nav.wrap,.topbar{min-width:0}
h1{font-size:clamp(1.86rem,3.4vw,2.48rem);max-width:24ch;overflow-wrap:break-word}
.hero-main h1{max-width:22ch}
.hero-split{grid-template-columns:minmax(0,1.2fr) minmax(280px,.8fr)}
@media (max-width:760px){
  .wrap{width:calc(100% - 28px);max-width:calc(100% - 28px)}
  .topbar{gap:.45rem;align-items:center}
  .brand img{height:32px}
  .topbar-call{font-size:.76rem;min-height:36px;padding:.44rem .6rem;box-shadow:none}
  h1{font-size:clamp(1.68rem,7.2vw,2.08rem);max-width:100%;line-height:1.16}
  .hero-main h1{max-width:100%}
}

@media (max-width:980px){
  .hero-split,.summary-shell,.contact-grid{grid-template-columns:1fr}
}
@media (max-width:760px){
  .hero-split,.summary-shell,.contact-grid{grid-template-columns:1fr}
  .trust-strip,.hero-mini-grid,.grid-cards,.quick-links,.process-grid,.problem-grid,.question-grid{grid-template-columns:1fr}
}