/* ===== 全局 ===== */
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:#f8f9fc;color:#2d3748;line-height:1.6;-webkit-font-smoothing:antialiased;}
a{text-decoration:none;color:inherit;}
img{max-width:100%;display:block;}

/* ===== 光标聚焦框样式 ===== */
input:focus,textarea:focus,select:focus,button:focus{outline:none;}
.nav-link:focus-visible,.download-btn:focus-visible,.feature-card:focus-visible,.tutorial-card:focus-visible,.feedback-action-btn:focus-visible,.query-btn:focus-visible{outline:2px solid #8b5cf6;outline-offset:3px;border-radius:10px;}
input:focus,textarea:focus{box-shadow:0 0 0 3px rgba(139,92,246,0.2),0 0 12px rgba(139,92,246,0.15);border-color:#8b5cf6 !important;}
.query-input:focus{box-shadow:0 0 0 3px rgba(139,92,246,0.2),0 0 12px rgba(139,92,246,0.15);border-color:#8b5cf6;}

/* ===== 顶部导航 ===== */
.top-nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,0.85);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid rgba(0,0,0,0.06);}
.top-nav-inner{max-width:1140px;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;height:64px;}
.nav-logo{font-size:19px;font-weight:800;display:flex;align-items:center;gap:8px;min-width:0;flex:1;}
.nav-logo-icon{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,#667eea,#764ba2);display:flex;align-items:center;justify-content:center;font-size:18px;box-shadow:0 4px 12px rgba(102,126,234,0.35);flex-shrink:0;}
.nav-logo-text{background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0;}
.nav-links{display:flex;gap:4px;align-items:center;}
.nav-link{padding:8px 18px;border-radius:10px;font-size:14px;color:#64748b;transition:all .25s;cursor:pointer;font-weight:500;white-space:nowrap;flex-shrink:0;}
.nav-link:hover{background:#f1f5f9;color:#334155;}
.nav-feedback-btn{background:linear-gradient(135deg,#f59e0b,#f97316);color:#fff !important;padding:9px 20px;border-radius:24px;font-weight:600;box-shadow:0 4px 14px rgba(249,115,22,0.4);position:relative;overflow:hidden;}
.nav-feedback-btn::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,0.3),transparent);animation:shine 3s infinite;}
@keyframes shine{0%{left:-100%;}50%,100%{left:100%;}}

/* ===== Hero区 ===== */
.hero{position:relative;background:linear-gradient(135deg,#1e1b4b 0%,#312e81 40%,#4c1d95 100%);color:#fff;padding:80px 24px 100px;overflow:hidden;}
.hero::before{content:'';position:absolute;top:-200px;right:-200px;width:600px;height:600px;border-radius:50%;background:radial-gradient(circle,rgba(139,92,246,0.3),transparent 70%);}
.hero::after{content:'';position:absolute;bottom:-150px;left:-150px;width:500px;height:500px;border-radius:50%;background:radial-gradient(circle,rgba(59,130,246,0.25),transparent 70%);}
.hero-content{position:relative;z-index:1;max-width:800px;margin:0 auto;text-align:center;}
.hero-badge{display:inline-block;padding:6px 16px;background:rgba(255,255,255,0.12);border:1px solid rgba(255,255,255,0.2);border-radius:20px;font-size:13px;margin-bottom:20px;backdrop-filter:blur(10px);}
.hero h1{font-size:42px;font-weight:800;margin-bottom:16px;letter-spacing:-0.5px;line-height:1.2;word-break:break-word;overflow-wrap:break-word;}
.hero h1 span{background:linear-gradient(135deg,#a5b4fc,#c4b5fd,#f0abfc);-webkit-background-clip:text;-webkit-text-fill-color:transparent;}
.hero p{font-size:17px;opacity:0.85;margin-bottom:36px;max-width:560px;margin-left:auto;margin-right:auto;word-break:break-word;overflow-wrap:break-word;line-height:1.7;white-space:pre-wrap;}
.hero-subtitle-box{margin-bottom:28px;display:flex;flex-direction:column;align-items:center;gap:8px;}
.hero-subtitle-box.hero-subtitle-all{flex-wrap:wrap;flex-direction:row;justify-content:center;}
.subtitle-tag{display:inline-block;padding:8px 20px;border:2px solid rgba(255,255,255,0.35);border-radius:24px;font-size:15px;opacity:0.9;line-height:1.6;word-break:break-word;overflow-wrap:break-word;white-space:pre-wrap;max-width:90%;text-align:center;background:rgba(255,255,255,0.08);backdrop-filter:blur(8px);transition:all .3s;}
.subtitle-tag:hover{border-color:rgba(255,255,255,0.6);background:rgba(255,255,255,0.15);}
.hero-subtitle-rotate .subtitle-tag{display:none;}
.hero-subtitle-rotate .subtitle-tag.active{display:inline-block;animation:fadeIn .6s ease;}
.hero-subtitle-all .subtitle-tag{display:inline-block;}
@keyframes fadeIn{from{opacity:0;transform:translateY(5px);}to{opacity:0.9;transform:translateY(0);}}
.hero-stats{display:flex;justify-content:center;gap:48px;margin-bottom:40px;}
.stat-item{text-align:center;}
.stat-num{font-size:32px;font-weight:800;display:block;background:linear-gradient(135deg,#fff,#c4b5fd);-webkit-background-clip:text;-webkit-text-fill-color:transparent;}
.stat-label{font-size:13px;opacity:0.7;margin-top:2px;}
.hero-download{display:none;}
.hero-quick-nav{display:none;}

/* ===== 下载按钮 ===== */
.download-section{max-width:900px;margin:-50px auto 0;padding:0 24px;position:relative;z-index:2;}
.download-buttons{display:flex;flex-wrap:wrap;gap:16px;justify-content:center;}
.download-btn{display:inline-flex;align-items:center;gap:12px;padding:18px 36px;border-radius:16px;font-size:16px;font-weight:700;color:#fff;cursor:pointer;transition:all .3s;box-shadow:0 8px 24px rgba(0,0,0,0.18);border:none;position:relative;overflow:hidden;}
.download-btn::after{content:'';position:absolute;top:0;left:0;right:0;height:50%;background:linear-gradient(180deg,rgba(255,255,255,0.2),transparent);}
.download-btn:hover{transform:translateY(-3px);box-shadow:0 14px 36px rgba(0,0,0,0.25);}
.download-btn:active{transform:translateY(-1px);}
.download-btn .btn-icon{font-size:24px;position:relative;z-index:1;}
.download-btn .btn-text{text-align:left;position:relative;z-index:1;}
.download-btn .btn-title{font-size:17px;font-weight:700;line-height:1.2;}
.download-btn .btn-sub{font-size:12px;opacity:0.85;font-weight:400;}

/* ===== 通用区块 ===== */
.section-wrap{max-width:1140px;margin:0 auto;padding:70px 24px;}
.section-title-wrap{text-align:center;margin-bottom:40px;}
.section-tag{display:inline-block;padding:5px 14px;background:#eef2ff;color:#667eea;border-radius:20px;font-size:12px;font-weight:600;margin-bottom:12px;letter-spacing:1px;}
.section-title{font-size:30px;font-weight:800;color:#1e293b;letter-spacing:-0.3px;}
.section-subtitle{font-size:15px;color:#94a3b8;margin-top:8px;}

/* ===== 特色卡片 ===== */
.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.feature-card{background:#fff;border-radius:18px;padding:26px 22px;box-shadow:0 2px 12px rgba(0,0,0,0.05);transition:all .35s cubic-bezier(.4,0,.2,1);border:1px solid rgba(0,0,0,0.04);display:flex;flex-direction:column;gap:12px;position:relative;overflow:hidden;}
.feature-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--card-accent,#667eea),transparent);opacity:0;transition:opacity .3s;}
.feature-card:hover{transform:translateY(-6px);box-shadow:0 16px 40px rgba(0,0,0,0.1);}
.feature-card:hover::before{opacity:1;}
.feature-card-link{cursor:pointer;}
.feature-head{display:flex;align-items:center;gap:12px;}
.feature-icon{font-size:28px;width:48px;height:48px;display:flex;align-items:center;justify-content:center;border-radius:14px;background:var(--icon-bg,#eef2ff);flex-shrink:0;}
.feature-title{font-size:var(--title-font-size,17px);font-family:var(--title-font-family,inherit);font-weight:700;margin:0;flex:1;min-width:0;color:var(--title-color,#1e293b);}
.feature-desc{font-size:var(--desc-font-size,13.5px);font-family:var(--desc-font-family,inherit);line-height:1.7;margin:0;color:var(--desc-color,var(--text-color,#64748b));white-space:pre-wrap;word-break:break-word;}
.feature-note{font-size:11.5px;color:#94a3b8;line-height:1.5;margin:0;padding-top:10px;border-top:1px dashed #e2e8f0;display:flex;align-items:center;gap:5px;}
.feature-note::before{content:'💡';font-size:12px;}

/* ===== 截图轮播 ===== */
.intro-section{background:#fff;border-top:1px solid #f1f5f9;border-bottom:1px solid #f1f5f9;}
.intro-carousel{position:relative;border-radius:20px;overflow:hidden;box-shadow:0 20px 60px rgba(0,0,0,0.12);max-width:900px;margin:0 auto;}
.intro-carousel-inner{display:flex;transition:transform .6s cubic-bezier(.4,0,.2,1);}
.intro-slide{min-width:100%;}
.intro-slide img{width:100%;height:auto;object-fit:cover;}
.intro-dots{display:flex;justify-content:center;gap:8px;margin-top:24px;}
.intro-dot{width:10px;height:10px;border-radius:50%;background:#cbd5e1;cursor:pointer;transition:all .3s;}
.intro-dot.active{background:#667eea;width:28px;border-radius:5px;}

/* ===== 教程入口 ===== */
.tutorials-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;}
.tutorial-card{background:#fff;border-radius:16px;padding:24px 20px;text-align:center;box-shadow:0 2px 10px rgba(0,0,0,0.04);transition:all .3s;cursor:pointer;border:1px solid rgba(0,0,0,0.04);}
.tutorial-card:hover{transform:translateY(-4px);box-shadow:0 12px 30px rgba(0,0,0,0.1);border-color:#c7d2fe;}
.tutorial-icon{font-size:36px;margin-bottom:10px;display:inline-block;width:64px;height:64px;line-height:64px;border-radius:18px;background:linear-gradient(135deg,#eef2ff,#e0e7ff);}
.tutorial-brand{font-size:16px;font-weight:700;color:#1e293b;}
.tutorial-cat{font-size:12px;color:#94a3b8;margin-top:4px;}

/* ===== 反馈区 ===== */
.feedback-section{background:linear-gradient(135deg,#1e1b4b 0%,#312e81 50%,#4c1d95 100%);color:#fff;padding:70px 24px;position:relative;overflow:hidden;}
.feedback-section::before{content:'';position:absolute;top:0;left:50%;transform:translateX(-50%);width:800px;height:400px;background:radial-gradient(ellipse,rgba(139,92,246,0.3),transparent 70%);}
.feedback-inner{max-width:800px;margin:0 auto;position:relative;z-index:1;text-align:center;}
.feedback-section .section-title{color:#fff;}
.feedback-section .section-subtitle{color:rgba(255,255,255,0.7);}
.feedback-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-top:32px;}
.feedback-action-btn{padding:16px 36px;border-radius:14px;font-size:15px;font-weight:700;cursor:pointer;transition:all .3s;border:none;display:inline-flex;align-items:center;gap:8px;}
.btn-primary-white{background:#fff;color:#4c1d95;box-shadow:0 8px 24px rgba(0,0,0,0.2);}
.btn-primary-white:hover{transform:translateY(-2px);box-shadow:0 12px 32px rgba(0,0,0,0.3);}
.btn-outline-white{background:transparent;color:#fff;border:2px solid rgba(255,255,255,0.4);}
.btn-outline-white:hover{background:rgba(255,255,255,0.1);border-color:#fff;}

/* ===== 编号查询 ===== */
.query-section{max-width:560px;margin:-30px auto 0;padding:0 24px;position:relative;z-index:2;}
.query-box{background:#fff;border-radius:20px;padding:32px;box-shadow:0 12px 40px rgba(0,0,0,0.1);text-align:center;}
.query-box h3{font-size:18px;font-weight:700;margin-bottom:6px;color:#1e293b;}
.query-box p{font-size:13px;color:#94a3b8;margin-bottom:20px;}
.query-input-row{display:flex;gap:10px;}
.query-input{flex:1;padding:14px 18px;border:2px solid #e2e8f0;border-radius:12px;font-size:16px;outline:none;transition:border-color .2s;font-family:inherit;}
.query-input:focus{border-color:#667eea;box-shadow:0 0 0 3px rgba(102,126,234,0.1);}
.query-btn{padding:14px 28px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:12px;font-size:15px;font-weight:700;cursor:pointer;transition:all .2s;}
.query-btn:hover{transform:translateY(-1px);box-shadow:0 6px 16px rgba(102,126,234,0.4);}

/* ===== 页脚 ===== */
.footer{background:#0f172a;color:#64748b;padding:32px 24px;text-align:center;font-size:13px;margin-top:60px;}
.footer a{color:#818cf8;}

/* ===== 反馈提交页/查询页 ===== */
.page-container{max-width:680px;margin:40px auto;padding:0 24px;}
.page-card{background:#fff;border-radius:20px;padding:36px;box-shadow:0 4px 24px rgba(0,0,0,0.06);}
.page-title{font-size:24px;font-weight:800;margin-bottom:6px;color:#1e293b;}
.page-desc{font-size:14px;color:#94a3b8;margin-bottom:28px;}
.form-group{margin-bottom:20px;}
.form-label{display:block;font-size:14px;font-weight:600;color:#475569;margin-bottom:8px;}
.form-input{width:100%;padding:13px 16px;border:2px solid #e2e8f0;border-radius:12px;font-size:14px;outline:none;transition:all .2s;font-family:inherit;}
.form-input:focus{border-color:#667eea;box-shadow:0 0 0 3px rgba(102,126,234,0.1);}
textarea.form-input{resize:vertical;min-height:110px;}
.form-hint{font-size:12px;color:#94a3b8;margin-top:6px;}
.submit-btn{width:100%;padding:15px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:12px;font-size:16px;font-weight:700;cursor:pointer;transition:all .3s;}
.submit-btn:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(102,126,234,0.4);}
.submit-btn:disabled{opacity:0.6;cursor:not-allowed;transform:none;}

.upload-area{border:2px dashed #cbd5e1;border-radius:14px;padding:28px;text-align:center;cursor:pointer;transition:all .2s;}
.upload-area:hover{border-color:#667eea;background:#f8faff;}
.upload-area-icon{font-size:36px;margin-bottom:8px;}
.upload-area-text{font-size:14px;color:#94a3b8;}
.upload-preview{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px;}
.upload-preview-item{position:relative;width:84px;height:84px;border-radius:10px;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,0.1);}
.upload-preview-item img{width:100%;height:100%;object-fit:cover;}
.upload-preview-remove{position:absolute;top:4px;right:4px;width:22px;height:22px;background:rgba(0,0,0,0.6);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:13px;cursor:pointer;}

.progress-bar{width:100%;height:6px;background:#f1f5f9;border-radius:3px;overflow:hidden;margin-top:12px;display:none;}
.progress-bar-fill{height:100%;background:linear-gradient(90deg,#667eea,#764ba2);width:0%;transition:width .3s;}

.success-box{text-align:center;padding:20px 0;}
.success-icon{font-size:64px;margin-bottom:16px;}
.success-code{font-size:40px;font-weight:800;color:#667eea;letter-spacing:6px;margin:16px 0;font-family:monospace;}
.success-tip{font-size:14px;color:#94a3b8;}

.result-item{background:#f8fafc;border-radius:14px;padding:18px;margin-bottom:14px;border:1px solid #f1f5f9;}
.result-label{font-size:12px;color:#94a3b8;margin-bottom:5px;font-weight:600;text-transform:uppercase;letter-spacing:0.5px;}
.result-content{font-size:14px;color:#334155;line-height:1.7;}
.result-status{display:inline-block;padding:5px 14px;border-radius:20px;font-size:12px;font-weight:700;}
.status-pending{background:#fef3c7;color:#b45309;}
.status-replied{background:#d1fae5;color:#047857;}
.result-images{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px;}
.result-image-link{display:inline-flex;align-items:center;gap:5px;padding:7px 14px;background:#eef2ff;color:#667eea;border-radius:8px;font-size:13px;font-weight:500;}
.result-image-link:hover{background:#667eea;color:#fff;}

/* ===== 响应式：平板 ===== */
@media (max-width: 960px){
    .features-grid{grid-template-columns:repeat(2,1fr);}
    .tutorials-grid{grid-template-columns:repeat(2,1fr);}
    .hero h1{font-size:34px;}
}

/* ===== 响应式：手机 ===== */
@media (max-width: 640px){
    .top-nav-inner{height:56px;padding:0 16px;justify-content:center;}
    .nav-logo{display:none;}
    .nav-links{gap:12px;width:100%;justify-content:center;}
    .nav-link{padding:8px 20px;font-size:14px;border:2px solid #667eea;border-radius:24px;color:#667eea;font-weight:600;background:#fff;}
    .nav-feedback-btn{padding:8px 20px;font-size:14px;border:2px solid #f59e0b;border-radius:24px;background:linear-gradient(135deg,#f59e0b,#f97316);color:#fff !important;font-weight:600;}
    .hero{padding:36px 16px 50px;}
    .hero-badge{font-size:11px;padding:5px 12px;margin-bottom:14px;}
    .hero h1{font-size:24px;line-height:1.3;}
    .hero p{font-size:13px;margin-bottom:20px;line-height:1.6;}
    .hero-subtitle-rotate{margin-bottom:20px;}
    .hero-subtitle-item{font-size:13px;line-height:1.6;}
    .hero-stats{gap:20px;margin-bottom:24px;}
    .stat-num{font-size:22px;}
    .stat-label{font-size:10px;}
    .hero-download{display:block;margin-bottom:24px;}
    .hero-quick-nav{display:flex;gap:12px;justify-content:center;margin-bottom:8px;}
    .hero-quick-btn{padding:10px 20px;border-radius:24px;font-size:14px;font-weight:600;border:2px solid rgba(255,255,255,0.5);color:#fff;background:rgba(255,255,255,0.1);backdrop-filter:blur(10px);white-space:nowrap;}
    .hero-quick-btn-orange{border-color:#f59e0b;background:linear-gradient(135deg,#f59e0b,#f97316);}
    .hero-download .download-btn{width:100%;justify-content:center;padding:15px 24px;font-size:15px;}
    .download-section{display:none;}
    .download-buttons{flex-direction:column;align-items:stretch;gap:10px;}
    .download-btn{justify-content:center;padding:16px 24px;font-size:15px;}
    .section-wrap{padding:48px 16px;}
    .section-title{font-size:24px;}
    .features-grid{grid-template-columns:1fr;gap:14px;}
    .feature-card{padding:20px 18px;}
    .feature-icon{width:42px;height:42px;font-size:22px;}
    .feature-title{font-size:var(--title-font-size,15px);}
    .feature-desc{font-size:var(--desc-font-size,13px);}
    .tutorials-grid{grid-template-columns:repeat(2,1fr);gap:12px;}
    .tutorial-card{padding:18px 12px;}
    .tutorial-icon{width:52px;height:52px;line-height:52px;font-size:26px;}
    .tutorial-brand{font-size:14px;}
    .feedback-section{padding:50px 16px;}
    .feedback-actions{flex-direction:column;}
    .feedback-action-btn{width:100%;justify-content:center;}
    .query-section{padding:0 16px;}
    .query-box{padding:24px 20px;}
    .query-input-row{flex-direction:column;}
    .page-container{padding:0 16px;margin:24px auto;}
    .page-card{padding:24px 20px;}
    .success-code{font-size:32px;letter-spacing:4px;}
}