/* ===== RESET ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:5rem}
body{min-height:100vh;line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
img,picture,video,canvas,svg{display:block;max-width:100%}
input,button,textarea,select{font:inherit}
h1,h2,h3,h4,h5,h6{overflow-wrap:break-word;text-wrap:pretty}
p{text-wrap:pretty}
ul,ol{list-style:none}
a{text-decoration:none;color:inherit}
button{cursor:pointer;border:none;background:none}
:focus-visible{outline:3px solid #E84D39;outline-offset:2px;border-radius:4px}

/* ===== VARIABLES ===== */
:root{
  --cream-bg:#F5F0E8;
  --deep-brown:#2D2A24;
  --red-orange:#E84D39;
  --deep-blue:#1B3A5C;
  --white-card:#FFFFFF;
  --silver-border:#C0C0C0;
  --light-gray-bg:#F0EDE5;
  --black-high:#111111;
  --font-heading:'Montserrat','Helvetica Neue',Arial,sans-serif;
  --font-body:'Inter','Noto Sans SC','PingFang SC','Microsoft YaHei',sans-serif;
  --font-accent:'Oswald','Impact','Helvetica Neue',sans-serif;
  --header-h:4.25rem;
  --max-w:1280px;
  --gap:1.5rem;
  --radius-sm:8px;
  --radius-md:16px;
  --radius-lg:40px;
  --shadow-float:0 8px 32px rgba(45,42,36,0.10);
  --shadow-card:0 4px 16px rgba(45,42,36,0.06);
  --transition:0.3s cubic-bezier(0.22,1,0.36,1);
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{transition-duration:0s!important;animation-duration:0s!important}
}

/* ===== BASE TYPOGRAPHY ===== */
body{
  font-family:var(--font-body);
  font-weight:400;
  color:var(--deep-brown);
  background:var(--cream-bg);
}
::selection{background:var(--red-orange);color:#fff}
h1,h2,h3,h4{font-family:var(--font-heading);font-weight:800;letter-spacing:-0.02em;line-height:1.15}
h1{font-size:clamp(2.2rem,6vw,3.8rem)}
h2{font-size:clamp(1.6rem,4vw,2.6rem)}
h3{font-size:clamp(1.2rem,2.5vw,1.6rem)}
h4{font-size:1.1rem}
.accent-text{font-family:var(--font-accent);text-transform:uppercase;letter-spacing:0.04em}

/* ===== SKIP LINK ===== */
.skip-link{
  position:fixed;top:-100%;left:1rem;z-index:10000;
  background:var(--deep-blue);color:#fff;padding:0.75rem 1.5rem;
  border-radius:var(--radius-sm);font-weight:600;
  transition:top 0.2s;
}
.skip-link:focus{top:1rem}

/* ===== PROGRESS BAR ===== */
.progress-bar{
  position:fixed;top:0;left:0;z-index:9999;
  width:100%;height:4px;background:transparent;pointer-events:none;
}
.progress-bar__fill{
  display:block;height:100%;width:0%;
  background:linear-gradient(90deg,var(--red-orange),var(--deep-blue));
  transition:width 0.15s ease-out;
}

/* ===== SITE HEADER ===== */
.site-header{
  position:sticky;top:4px;z-index:9990;
  width:100%;padding:0.5rem 0;
  background:rgba(245,240,232,0.88);
  backdrop-filter:blur(16px) saturate(1.1);
  -webkit-backdrop-filter:blur(16px) saturate(1.1);
  border-bottom:1px solid rgba(192,192,192,0.3);
  transition:box-shadow var(--transition);
}
.site-header[data-scrolled]{box-shadow:var(--shadow-float)}
.header__inner{
  max-width:var(--max-w);margin:0 auto;padding:0 var(--gap);
  display:flex;align-items:center;justify-content:space-between;
  min-height:3rem;
}
.header__brand{flex-shrink:0}
.header__logo{
  font-family:var(--font-heading);font-weight:800;font-size:1.35rem;
  color:var(--deep-brown);letter-spacing:-0.02em;display:flex;align-items:baseline;gap:0.4rem;
}
.header__logo-tag{
  font-family:var(--font-accent);font-weight:400;font-size:0.7rem;
  color:var(--red-orange);text-transform:uppercase;letter-spacing:0.08em;
}
.header__nav{
  display:flex;align-items:center;gap:1.2rem;
}
.nav__list{display:flex;align-items:center;gap:0.2rem;flex-wrap:wrap}
.nav__link{
  display:inline-block;padding:0.45rem 1rem;
  font-family:var(--font-body);font-weight:500;font-size:0.875rem;
  color:var(--deep-brown);border-radius:var(--radius-lg);
  transition:background var(--transition),color var(--transition);
  white-space:nowrap;
}
.nav__link:hover,.nav__link:focus-visible{background:rgba(232,77,57,0.12);color:var(--red-orange)}
.nav__link[aria-current="page"]{
  background:var(--deep-blue);color:#fff;font-weight:600;
  box-shadow:0 2px 8px rgba(27,58,92,0.25);
}
.nav__focus-wrap{display:flex;align-items:center;padding-left:0.8rem;border-left:1px solid var(--silver-border)}
.nav__focus-toggle{
  display:flex;align-items:center;gap:0.5rem;
  font-family:var(--font-accent);font-size:0.7rem;text-transform:uppercase;letter-spacing:0.06em;
  color:var(--deep-brown);padding:0.3rem 0.6rem;border-radius:var(--radius-lg);
  transition:background var(--transition);
}
.nav__focus-toggle:hover{background:rgba(232,77,57,0.08)}
.toggle__label{line-height:1}
.toggle__track{
  display:inline-block;width:36px;height:20px;
  background:var(--silver-border);border-radius:10px;
  position:relative;transition:background var(--transition);
}
.toggle__thumb{
  display:block;width:16px;height:16px;border-radius:50%;
  background:var(--white-card);box-shadow:0 1px 4px rgba(0,0,0,0.18);
  position:absolute;top:2px;left:2px;
  transition:transform var(--transition),background var(--transition);
}
[aria-pressed="true"] .toggle__track{background:var(--red-orange)}
[aria-pressed="true"] .toggle__thumb{transform:translateX(16px);background:#fff}

/* ===== HAMBURGER ===== */
.header__nav-toggle{
  display:none;flex-direction:column;justify-content:center;gap:5px;
  width:40px;height:40px;padding:8px;border-radius:var(--radius-sm);
  background:transparent;transition:background var(--transition);
}
.header__nav-toggle:hover{background:rgba(232,77,57,0.10)}
.hamburger-line{
  display:block;width:100%;height:2.5px;
  background:var(--deep-brown);border-radius:2px;
  transition:transform var(--transition),opacity var(--transition);
}
[data-nav-toggle][aria-expanded="true"] .hamburger-line:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
[data-nav-toggle][aria-expanded="true"] .hamburger-line:nth-child(2){opacity:0}
[data-nav-toggle][aria-expanded="true"] .hamburger-line:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}

/* ===== MOBILE NAV ===== */
@media(max-width:820px){
  .header__nav-toggle{display:flex}
  .header__nav{
    position:fixed;top:calc(var(--header-h) + 4px);left:0;right:0;z-index:9980;
    flex-direction:column;align-items:stretch;gap:0;
    background:rgba(245,240,232,0.97);backdrop-filter:blur(20px);
    padding:1rem var(--gap) 1.5rem;
    border-bottom:2px solid var(--red-orange);
    box-shadow:var(--shadow-float);
    transform:translateY(-110%);opacity:0;visibility:hidden;
    transition:transform 0.35s ease,opacity 0.3s ease,visibility 0.3s;
  }
  .header__nav[data-open]{
    transform:translateY(0);opacity:1;visibility:visible;
  }
  .nav__list{
    flex-direction:column;gap:0.25rem;width:100%;
  }
  .nav__link{
    display:block;width:100%;padding:0.7rem 1rem;
    font-size:1rem;border-radius:var(--radius-sm);
  }
  .nav__focus-wrap{
    border-left:none;padding-left:0;padding-top:0.6rem;margin-top:0.4rem;
    border-top:1px solid var(--silver-border);justify-content:flex-start;
  }
  .nav__focus-toggle{padding:0.5rem 0.8rem}
}

/* ===== SITE FOOTER ===== */
.site-footer{
  background:var(--deep-blue);color:rgba(255,255,255,0.90);
  padding:3rem 0 1.5rem;margin-top:4rem;
  border-top:4px solid var(--red-orange);
}
.footer__inner{
  max-width:var(--max-w);margin:0 auto;padding:0 var(--gap);
  display:grid;grid-template-columns:1fr 2fr;gap:2.5rem 3rem;
}
.footer__brand{display:flex;flex-direction:column;gap:0.5rem}
.footer__logo{
  font-family:var(--font-heading);font-weight:800;font-size:1.6rem;
  color:#fff;letter-spacing:-0.02em;
}
.footer__tagline{
  font-family:var(--font-accent);font-size:0.8rem;text-transform:uppercase;
  color:var(--silver-border);letter-spacing:0.06em;line-height:1.4;
}
.footer__info{display:flex;flex-direction:column;gap:1.2rem}
.footer__contact{display:flex;flex-direction:column;gap:0.4rem}
.footer__contact-item{
  font-size:0.9rem;line-height:1.5;display:flex;align-items:center;gap:0.4rem;
}
.contact__icon{font-size:0.85rem;opacity:0.7;width:1.2rem;text-align:center}
.footer__link--inline{color:var(--silver-border);text-decoration:underline;text-underline-offset:3px}
.footer__link--inline:hover{color:#fff}
.footer__links{
  display:flex;align-items:center;gap:0.6rem;flex-wrap:wrap;
  padding-top:0.4rem;border-top:1px solid rgba(192,192,192,0.2);
}
.footer__link{
  font-size:0.85rem;color:var(--silver-border);
  transition:color var(--transition);padding:0.2rem 0;
}
.footer__link:hover{color:#fff;text-decoration:underline;text-underline-offset:3px}
.footer__link-sep{color:rgba(192,192,192,0.3);font-size:0.75rem}
.footer__bottom{
  grid-column:1/-1;
  display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;
  gap:0.8rem;padding-top:1.5rem;margin-top:0.8rem;
  border-top:1px solid rgba(192,192,192,0.15);
}
.footer__icp{font-size:0.8rem;color:rgba(192,192,192,0.6)}
.footer__copyright{font-size:0.78rem;color:rgba(192,192,192,0.5);line-height:1.4}

@media(max-width:720px){
  .footer__inner{grid-template-columns:1fr;gap:1.5rem}
  .footer__bottom{flex-direction:column;align-items:flex-start}
}

/* ===== GENERIC UTILITIES ===== */
.page-container{max-width:var(--max-w);margin:0 auto;padding:0 var(--gap)}
.page-section{padding:3rem 0}
.page-section--narrow{padding:2rem 0}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* ===== GRID SPLIT (左右分屏基础) ===== */
.grid-split{
  display:grid;grid-template-columns:1fr 1fr;gap:2.5rem;
}
.grid-split--wide{grid-template-columns:1fr 1.6fr}
.grid-split--narrow{grid-template-columns:1fr 0.9fr}
@media(max-width:820px){
  .grid-split,.grid-split--wide,.grid-split--narrow{grid-template-columns:1fr;gap:1.5rem}
}

/* ===== CONTENT CARD ===== */
.card{
  background:var(--white-card);border-radius:var(--radius-md);
  padding:1.5rem;box-shadow:var(--shadow-card);
  border:1px solid rgba(192,192,192,0.2);
  transition:transform var(--transition),box-shadow var(--transition);
}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-float)}
.card--accent{border-left:4px solid var(--red-orange)}
.card--blue{border-left:4px solid var(--deep-blue)}

/* ===== BUTTONS ===== */
.btn{
  display:inline-flex;align-items:center;gap:0.5rem;
  padding:0.6rem 1.6rem;border-radius:var(--radius-lg);
  font-family:var(--font-body);font-weight:600;font-size:0.9rem;
  transition:background var(--transition),color var(--transition),transform var(--transition);
  cursor:pointer;
}
.btn--primary{background:var(--red-orange);color:#fff;box-shadow:0 4px 12px rgba(232,77,57,0.25)}
.btn--primary:hover{background:#d4402e;transform:translateY(-1px)}
.btn--secondary{background:var(--deep-blue);color:#fff;box-shadow:0 4px 12px rgba(27,58,92,0.25)}
.btn--secondary:hover{background:#152d4a;transform:translateY(-1px)}
.btn--outline{background:transparent;color:var(--deep-brown);border:2px solid var(--deep-brown)}
.btn--outline:hover{background:var(--deep-brown);color:#fff}
.btn--sm{padding:0.4rem 1rem;font-size:0.8rem}

/* ===== BREADCRUMB ===== */
.breadcrumb{
  display:flex;align-items:center;gap:0.3rem;flex-wrap:wrap;
  font-size:0.8rem;color:rgba(45,42,36,0.55);padding:0.5rem 0;
}
.breadcrumb__link{color:var(--deep-blue);text-decoration:underline;text-underline-offset:3px}
.breadcrumb__link:hover{color:var(--red-orange)}
.breadcrumb__sep{color:rgba(45,42,36,0.25);margin:0 0.1rem}

/* ===== TAG / CHIP ===== */
.chip{
  display:inline-flex;align-items:center;
  padding:0.2rem 0.8rem;border-radius:var(--radius-lg);
  font-family:var(--font-accent);font-size:0.7rem;text-transform:uppercase;
  letter-spacing:0.04em;background:var(--light-gray-bg);color:var(--deep-brown);
}
.chip--hot{background:var(--red-orange);color:#fff}
.chip--blue{background:var(--deep-blue);color:#fff}
.chip--silver{background:var(--silver-border);color:var(--deep-brown)}

/* ===== FOCUS MODE (只看重点) ===== */
body[data-focus-mode="true"] .card:not(.card--accent):not(.card--blue){
  opacity:0.4;filter:grayscale(0.6);pointer-events:none;
}
body[data-focus-mode="true"] .card--accent,body[data-focus-mode="true"] .card--blue{
  box-shadow:0 0 0 3px var(--red-orange),var(--shadow-card);
}

/* ===== IMAGE CONTAINER (占位规则) ===== */
.img-frame{
  position:relative;overflow:hidden;border-radius:var(--radius-md);
  background:var(--light-gray-bg);aspect-ratio:16/9;
  display:flex;align-items:center;justify-content:center;
  color:rgba(45,42,36,0.25);font-family:var(--font-accent);font-size:0.8rem;text-transform:uppercase;
}
.img-frame--tall{aspect-ratio:3/4}
.img-frame--wide{aspect-ratio:21/9}
.img-frame img{width:100%;height:100%;object-fit:cover}

/* ===== RESPONSIVE HELPERS ===== */
@media(max-width:480px){
  :root{--gap:1rem}
  .page-section{padding:2rem 0}
}
@media(min-width:821px){.hide-desktop{display:none!important}}
@media(max-width:820px){.hide-mobile{display:none!important}}