/* ============================================================
   星烁艺雕主站 V3 · base.css
   设计令牌 / reset / 导航 / Hero / 信任数字带 / 按钮
   配色 V2：明亮有活力，禁炭黑禁死气沉沉（大哥20261017亲定）
   ============================================================ */
:root{
  --primary:#2374D9; --primary-light:#5297F2; --primary-bg:#E8F1FD;
  --primary-dark:#185BB3; --primary-deep:#0F3E74;
  --accent:#FF7D33; --accent-light:#FFEADC; --accent-dark:#E6631A;
  --white:#fff; --text-main:#1D2939; --text-secondary:#475467;
  --text-muted:#667085; --border:#EEF1F5; --bg-light:#F7F9FC;
  --shadow-sm:0 2px 12px rgba(16,40,80,.06);
  --shadow-md:0 12px 36px rgba(35,116,217,.10);
  --shadow-lg:0 24px 60px rgba(16,50,100,.14);
  --radius:16px; --radius-lg:22px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:Inter,-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;background:var(--white);color:var(--text-main);line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{text-decoration:none;color:inherit}
ul{list-style:none}
img{display:block;max-width:100%}
.container{max-width:1200px;margin:0 auto;padding:0 40px}
.section{padding:96px 0}
.bg-light{background:var(--bg-light)}

/* ===== 通用板块头 ===== */
.section-header{text-align:center;max-width:720px;margin:0 auto 56px}
.section-tag{display:inline-block;background:var(--primary-bg);color:var(--primary);padding:7px 20px;border-radius:20px;font-size:14px;font-weight:600;margin-bottom:18px;letter-spacing:.5px}
.section-title{font-size:38px;font-weight:800;margin-bottom:16px;color:var(--text-main);letter-spacing:.5px;line-height:1.3}
.section-desc{font-size:17px;color:var(--text-secondary);line-height:1.85}

/* ===== 按钮 ===== */
.btn{display:inline-flex;align-items:center;gap:9px;padding:15px 34px;border-radius:12px;font-size:16px;font-weight:600;transition:all .3s;cursor:pointer;border:none;white-space:nowrap}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 6px 18px rgba(255,125,51,.32)}
.btn-primary:hover{background:var(--accent-dark);transform:translateY(-2px);box-shadow:0 10px 26px rgba(255,125,51,.42)}
.btn-secondary{background:#fff;color:var(--primary);border:2px solid var(--primary);box-shadow:var(--shadow-sm)}
.btn-secondary:hover{background:var(--primary-bg);transform:translateY(-2px)}
.btn-ghost{background:rgba(35,116,217,.08);color:var(--primary)}
.btn-ghost:hover{background:var(--primary-bg)}
.btn-lg{padding:18px 46px;font-size:17px}

/* ===== 导航 ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(255,255,255,.9);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);padding:16px 40px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid transparent;transition:all .3s}
.nav.scrolled{box-shadow:0 2px 20px rgba(16,40,80,.08);padding:11px 40px;background:rgba(255,255,255,.96)}
.logo{font-size:25px;font-weight:800;color:var(--primary);letter-spacing:1px}
.logo span{color:var(--accent)}
.nav-links{display:flex;gap:32px;align-items:center}
.nav-links a{color:var(--text-secondary);font-size:15px;font-weight:500;transition:color .3s;position:relative}
.nav-links a:not(.nav-cta)::after{content:'';position:absolute;bottom:-5px;left:0;width:0;height:2px;background:var(--accent);border-radius:2px;transition:width .3s}
.nav-links a:not(.nav-cta):hover{color:var(--primary)}
.nav-links a:not(.nav-cta):hover::after{width:100%}
.nav-cta{background:var(--accent);color:#fff!important;padding:10px 24px;border-radius:9px;font-weight:600}
.nav-cta::after{display:none}
.nav-cta:hover{background:var(--accent-dark)}
.nav-toggle{display:none;background:none;border:none;font-size:24px;color:var(--primary);cursor:pointer;line-height:1}

/* ===== Hero ===== */
.hero{position:relative;min-height:680px;background:url(../images/hero_bg.png) center/cover no-repeat;display:flex;align-items:center;padding:110px 0 70px}
/* 左实右透明白渐变遮罩：保证左侧文字清晰、右侧露出实景 */
.hero::before{content:'';position:absolute;inset:0;background:linear-gradient(90deg,rgba(255,255,255,.97) 0%,rgba(255,255,255,.88) 34%,rgba(255,255,255,.55) 56%,rgba(255,255,255,.12) 76%,rgba(255,255,255,0) 100%)}
.hero-content{position:relative;z-index:2;width:100%}
.hero-left{max-width:600px;animation:fadeInLeft .8s ease-out}
.hero-badge{display:inline-flex;align-items:center;gap:9px;background:rgba(255,255,255,.9);border:1px solid rgba(35,116,217,.22);padding:9px 20px;border-radius:30px;font-size:14px;color:var(--primary);margin-bottom:26px;font-weight:600;box-shadow:var(--shadow-sm)}
.hero-badge::before{content:'';width:8px;height:8px;background:var(--accent);border-radius:50%;animation:pulse 2s infinite}
.hero-title{font-size:50px;font-weight:800;line-height:1.26;margin-bottom:22px;color:var(--text-main);letter-spacing:1px}
.hero-title .hl{color:var(--primary)}
.hero-title .hc{color:var(--accent)}
.hero-subtitle{font-size:18px;color:var(--text-secondary);margin-bottom:30px;max-width:540px;line-height:1.9}
.hero-stats{display:flex;gap:44px;margin-bottom:36px}
.stat-num{font-size:40px;font-weight:800;color:var(--primary);line-height:1.1}
.stat-num .accent{color:var(--accent)}
.stat-text{font-size:14px;color:var(--text-muted);margin-top:6px}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap}
.hero-trust{display:flex;gap:22px;margin-top:30px;flex-wrap:wrap}
.hero-trust span{font-size:13.5px;color:var(--text-muted);display:inline-flex;align-items:center;gap:7px}
.hero-trust svg{width:17px;height:17px;stroke:var(--primary);fill:none;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}

/* ===== 信任数字带 ===== */
.trustband{background:linear-gradient(120deg,var(--primary) 0%,var(--primary-dark) 100%);padding:0}
.trust-grid{display:grid;grid-template-columns:repeat(4,1fr)}
.trust-item{text-align:center;padding:44px 20px;color:#fff;position:relative}
.trust-item:not(:last-child)::after{content:'';position:absolute;right:0;top:50%;transform:translateY(-50%);height:46px;width:1px;background:rgba(255,255,255,.18)}
.trust-num{font-size:42px;font-weight:800;line-height:1;margin-bottom:10px}
.trust-num .u{font-size:22px;font-weight:700;margin-left:1px}
.trust-num .orange{color:#FFB36E}
.trust-label{font-size:14.5px;opacity:.92}

@keyframes fadeInLeft{from{opacity:0;transform:translateX(-40px)}to{opacity:1;transform:translateX(0)}}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.45;transform:scale(.85)}}
.fade-section{opacity:0;transform:translateY(38px);transition:opacity .8s ease-out,transform .8s ease-out}
.fade-section.visible{opacity:1;transform:translateY(0)}