/* ===== 科晟税务官网 · 公共样式表 ===== */
/* 配色锁定：深蓝 #1B3A6B + 橙 #E8941F，禁用第三种高饱和色 */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --blue:#1B3A6B;--orange:#E8941F;--blue-light:#E8EDF5;
  --blue-pale:#F2F5FA;--gray-dark:#2D3748;--gray:#5A6472;
  --gray-light:#718096;--bg:#F7FAFC;--white:#FFFFFF;
  --border:#E5E8EE;--font-display:'Noto Serif SC',serif;
  --font-body:'Noto Sans SC',sans-serif;--container:1200px;
  --radius:6px;--shadow-card:0 6px 20px rgba(27,58,107,.08);
  --transition:all .2s ease
}
html{scroll-behavior:smooth}
body{font-family:var(--font-body);color:var(--gray-dark);line-height:1.7;font-size:15px;background:var(--white)}
a{color:var(--blue);text-decoration:none;transition:var(--transition)}
a:hover{color:var(--orange)}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}

.container{max-width:var(--container);margin:0 auto;padding:0 20px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}

h1,h2,h3,h4{font-family:var(--font-display);color:var(--blue);line-height:1.3}
h1{font-size:clamp(28px,4vw,48px);font-weight:700}
h2{font-size:clamp(24px,3vw,32px);font-weight:700}
h3{font-size:20px;font-weight:600}
p{margin-bottom:1em}
.text-orange{color:var(--orange)}
.text-blue-light{color:var(--blue-light)}
.text-gray{color:var(--gray)}

.eyebrow{display:inline-block;font-size:14px;color:var(--orange);letter-spacing:2px;text-transform:uppercase;font-weight:600;font-family:var(--font-body);margin-bottom:8px}

.section-title{text-align:center;margin-bottom:60px}
.section-title h2{margin-bottom:12px}
.section-title .underline{display:inline-block;width:48px;height:3px;background:var(--orange);border-radius:2px;margin-top:10px}
.section-title .subtitle{font-size:16px;color:var(--gray);margin-top:14px;max-width:600px;margin-left:auto;margin-right:auto}

/* ===== BUTTONS ===== */
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 32px;border-radius:var(--radius);font-size:15px;font-weight:600;font-family:var(--font-body);cursor:pointer;border:none;transition:var(--transition);text-align:center;line-height:1.4;min-height:48px;min-width:44px}
.btn-primary{background:var(--orange);color:var(--white)}
.btn-primary:hover{background:#d4851b;color:var(--white);transform:translateY(-1px);box-shadow:0 4px 12px rgba(232,148,31,.3)}
.btn-outline{background:transparent;color:var(--blue);border:2px solid var(--blue)}
.btn-outline:hover{background:var(--blue);color:var(--white);transform:translateY(-1px)}
.btn-white{background:var(--white);color:var(--blue);border:2px solid var(--white)}
.btn-white:hover{background:transparent;color:var(--white);transform:translateY(-1px)}
.btn-sm{padding:10px 24px;font-size:14px;min-height:40px}
.btn-lg{padding:16px 40px;font-size:17px;min-height:56px}
.btn-block{width:100%;justify-content:center}

/* ===== CARDS ===== */
.card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:28px 32px;transition:var(--transition)}
.card:hover{border-color:#C9D8EE;box-shadow:var(--shadow-card);transform:translateY(-4px)}
.card .card-icon{width:48px;height:48px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:#FFF5EB;color:var(--orange);margin-bottom:16px;flex-shrink:0}
.card .card-icon svg{width:24px;height:24px}
.card h3{font-size:20px;margin-bottom:10px}
.card p{color:var(--gray);font-size:15px}

/* ===== NAVIGATION ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:1000;transition:var(--transition)}
.nav-transparent{background:transparent}
.nav-solid{background:var(--white);box-shadow:0 1px 4px rgba(27,58,107,.06)}
.nav-solid .nav-inner{border-bottom:1px solid var(--border)}
.nav-inner{max-width:var(--container);margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between;height:72px}
.nav-logo{display:flex;align-items:center;gap:12px}
.nav-logo img{height:40px;width:auto}
.nav-logo span{font-family:var(--font-display);font-size:18px;font-weight:700;color:var(--white);transition:var(--transition)}
.nav-solid .nav-logo span{color:var(--blue)}
.nav-links{display:flex;align-items:center;gap:36px}
.nav-links a{font-size:15px;font-weight:500;color:rgba(255,255,255,.9);transition:var(--transition);position:relative}
.nav-solid .nav-links a{color:var(--gray-dark)}
.nav-links a:hover,.nav-links a.active{color:var(--orange)}
.nav-links a::after{content:'';position:absolute;bottom:-4px;left:0;width:0;height:2px;background:var(--orange);transition:var(--transition)}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.nav-cta{padding:10px 24px !important;background:var(--orange) !important;color:var(--white) !important;border-radius:var(--radius) !important}
.nav-cta::after{display:none !important}
.nav-cta:hover{background:#d4851b !important;transform:translateY(-1px)}
.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px;background:none;border:none}
.hamburger span{display:block;width:24px;height:2px;background:var(--white);transition:var(--transition)}
.nav-solid .hamburger span{background:var(--blue)}
.mobile-menu{display:none;position:fixed;top:0;right:0;width:300px;height:100vh;background:var(--white);z-index:999;flex-direction:column;padding:80px 32px 32px;transform:translateX(100%);transition:transform .3s ease;box-shadow:-4px 0 20px rgba(0,0,0,.1)}
.mobile-menu.open{transform:translateX(0)}
.mobile-menu a{display:block;padding:16px 0;font-size:16px;font-weight:500;color:var(--gray-dark);border-bottom:1px solid var(--border)}
.mobile-menu a:hover{color:var(--orange)}

/* ===== PAGE HEADER (内页头图) ===== */
.page-header{position:relative;padding:150px 0 80px;background:var(--blue);color:var(--white);overflow:hidden}
.page-header-bg{position:absolute;inset:0;z-index:0}
.page-header-bg img{width:100%;height:100%;object-fit:cover;opacity:.18}
.page-header::after{content:'';position:absolute;inset:0;z-index:0;background:linear-gradient(125deg,rgba(15,39,80,.88) 0%,rgba(27,58,107,.78) 100%);pointer-events:none}
.page-header .deco{position:absolute;inset:0;z-index:1;overflow:hidden;pointer-events:none}
.page-header .deco::before,.page-header .deco::after{content:'';position:absolute;border:1px solid rgba(255,255,255,.12);border-radius:50%}
.page-header .deco::before{width:360px;height:360px;top:-90px;right:-70px}
.page-header .deco::after{width:240px;height:240px;bottom:-60px;left:-50px}
.page-header .container{position:relative;z-index:1}
.page-header .breadcrumb{font-size:14px;color:rgba(255,255,255,.6);margin-bottom:14px}
.page-header .breadcrumb a{color:rgba(255,255,255,.7)}
.page-header .breadcrumb a:hover{color:var(--orange)}
.page-header h1{color:var(--white);font-size:clamp(30px,4vw,44px);margin-bottom:14px}
.page-header p{color:var(--blue-light);font-size:17px;max-width:720px;line-height:1.8}

/* ===== TIMELINE ===== */
.timeline{position:relative;max-width:860px;margin:0 auto;padding:20px 0}
.timeline::before{content:'';position:absolute;left:50%;top:0;bottom:0;width:2px;background:var(--border);transform:translateX(-50%)}
.timeline-item{position:relative;width:50%;padding:18px 44px}
.timeline-item:nth-child(odd){left:0;text-align:right}
.timeline-item:nth-child(even){left:50%}
.timeline-item .tl-year{font-size:24px;font-weight:600;color:var(--blue);font-family:var(--font-display)}
.timeline-item .tl-title{font-size:16px;font-weight:600;color:var(--orange);margin:4px 0 6px}
.timeline-item .tl-desc{font-size:15px;color:var(--gray);line-height:1.7}
.timeline-item::before{content:'';position:absolute;top:26px;width:12px;height:12px;border-radius:50%;background:var(--orange);box-shadow:0 0 0 4px rgba(232,148,31,.18);z-index:1}
.timeline-item:nth-child(odd)::before{right:-6px}
.timeline-item:nth-child(even)::before{left:-6px}

/* ===== HONOR GRID ===== */
.honor-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.honor-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:28px 24px;text-align:center;transition:var(--transition)}
.honor-card:hover{border-color:#C9D8EE;box-shadow:var(--shadow-card);transform:translateY(-4px)}
.honor-card .honor-icon{width:56px;height:56px;margin:0 auto 16px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:#FFF5EB;color:var(--orange)}
.honor-card .honor-icon svg{width:28px;height:28px}
.honor-card h3{font-size:17px;margin-bottom:8px}
.honor-card .honor-level{display:inline-block;font-size:13px;color:var(--orange);background:#FFF5EB;padding:3px 12px;border-radius:20px;font-weight:600}

/* ===== PRINCIPLE ===== */
.principle-words{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:48px}
.principle-word{background:var(--blue);color:var(--white);border-radius:var(--radius);padding:32px 20px;text-align:center}
.principle-word span{font-family:var(--font-display);font-size:24px;font-weight:700;display:block}
.principle-list{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.principle-item{background:var(--bg);border-radius:var(--radius);padding:24px 28px;border-left:3px solid var(--orange)}
.principle-item h4{font-size:17px;margin-bottom:8px}
.principle-item p{font-size:14px;color:var(--gray);margin:0}

/* ===== CTA SECTION ===== */
.cta-section{padding:100px 0;background:var(--blue);color:var(--white);text-align:center}
.cta-section h2{color:var(--white);margin-bottom:16px}
.cta-section p{font-size:17px;color:var(--blue-light);max-width:600px;margin:0 auto 32px;line-height:1.8}
.cta-section .actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.cta-meta{margin-top:24px;font-size:14px;color:rgba(255,255,255,.5)}

/* ===== FOOTER ===== */
.footer{background:var(--gray-dark);color:rgba(255,255,255,.7);padding:60px 0 0}
.footer-main{display:grid;grid-template-columns:repeat(3,1fr);gap:48px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.1)}
.footer-col h4{color:var(--white);font-size:15px;font-family:var(--font-body);margin-bottom:16px}
.footer-col a{display:block;color:rgba(255,255,255,.6);font-size:14px;padding:6px 0;transition:var(--transition)}
.footer-col a:hover{color:var(--orange)}
.footer-bottom{padding:20px 0;text-align:center;font-size:13px;color:rgba(255,255,255,.4)}


/* ===== GENERIC CONTENT BLOCK ===== */
.content-block{padding:100px 0}
.content-block.alt{background:var(--bg)}
.content-block.white{background:var(--white)}
.rich-text{max-width:760px;margin:0 auto}
.rich-text p{color:var(--gray);font-size:15px;line-height:1.9;margin-bottom:1.1em}
.rich-text p strong{color:var(--gray-dark)}

/* ===== ABOUT INTRO (文字 + 视频) ===== */
.intro-grid{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:48px;align-items:start}
.intro-grid>*{min-width:0}
.intro-grid .rich-text{max-width:none;margin:0}
.intro-media{position:sticky;top:96px}
.intro-media video{width:100%;aspect-ratio:960/544;display:block;border-radius:var(--radius);background:#0F2647;box-shadow:0 10px 30px rgba(27,58,107,.18)}
.intro-media .video-caption{margin:12px 0 0;font-size:13px;color:var(--gray-light);text-align:center}

/* ===== ANIMATIONS ===== */
@keyframes fadeUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
.animate-in{animation:fadeUp .6s ease-out backwards}
.delay-1{animation-delay:.1s}.delay-2{animation-delay:.2s}.delay-3{animation-delay:.3s}
.delay-4{animation-delay:.4s}.delay-5{animation-delay:.5s}.delay-6{animation-delay:.6s}
.delay-7{animation-delay:.7s}

/* ===== RESPONSIVE ===== */
@media(max-width:1140px){
  .intro-grid{gap:32px}
}
@media(max-width:1024px){
  .honor-grid{grid-template-columns:repeat(2,1fr)}
  .principle-words{grid-template-columns:repeat(2,1fr)}
  .principle-list{grid-template-columns:1fr}
  .footer-main{grid-template-columns:1fr 1fr}
  .intro-grid{grid-template-columns:minmax(0,1fr) minmax(0,.94fr)}
}
@media(max-width:768px){
  .nav-links{display:none}
  .hamburger{display:flex}
  .mobile-menu{display:flex}
  .page-header{padding:120px 0 56px}
  .content-block{padding:60px 0}
  .timeline::before{left:20px}
  .timeline-item{width:100%;left:0 !important;text-align:left !important;padding:16px 0 16px 48px}
  .timeline-item::before{left:14px !important;right:auto !important}
  .honor-grid{grid-template-columns:1fr}
  .principle-words{grid-template-columns:1fr 1fr}
  .footer-main{grid-template-columns:1fr;gap:32px}
  .intro-grid{grid-template-columns:1fr;gap:28px}
  .intro-media{position:static}
  .cta-section .actions{flex-direction:column;align-items:center}
}
@media(max-width:640px){
  .principle-words{grid-template-columns:1fr}
  .btn{width:100%;justify-content:center}
}