/* ===== 酷睿奇打字 - 科技蓝主题 ===== */
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;color:#1e293b;line-height:1.6;min-height:100vh;background:#e8f4f8}

/* 页面主容器 */
.container{max-width:1100px;margin:0 auto;padding:0 20px}
.page-bg{background:#e8f4f8;min-height:calc(100vh - 60px);padding:28px 0}
.main-layout{display:block}
.main-content{background:#fff;border-radius:20px;padding:28px 32px 32px;box-shadow:0 12px 40px rgba(0,0,0,0.18);min-height:600px}

/* 导航栏 */
.navbar{background:#1e3a5f;height:60px;display:flex;align-items:center;justify-content:space-between;padding:0 32px;position:sticky;top:0;z-index:100;box-shadow:0 2px 12px rgba(30,58,95,0.3)}
.nav-brand{display:flex;align-items:center;gap:10px;font-size:1.15rem;font-weight:800;color:#fff;text-decoration:none}
.nav-brand i{font-size:1.3rem;color:#60a5fa}
.nav-links{display:flex;gap:6px}
.nav-links a{padding:6px 16px;border-radius:8px;color:#94a3b8;text-decoration:none;font-size:0.9rem;font-weight:500;transition:.15s}
.nav-links a:hover{color:#fff;background:rgba(255,255,255,0.1)}
.nav-links a.active{color:#fff;background:rgba(96,165,250,0.2);font-weight:700}
.nav-user{display:flex;align-items:center;gap:14px}
.nav-points{background:#2563eb;color:#fff;padding:5px 14px;border-radius:20px;font-size:0.85rem;font-weight:700;box-shadow:0 0 12px rgba(37,99,235,0.4)}
.btn-login{height:32px;padding:0 20px;border:1.5px solid #60a5fa;background:transparent;color:#60a5fa;border-radius:8px;font-size:0.85rem;font-weight:600;cursor:pointer;transition:.2s}
.btn-login:hover{background:#60a5fa;color:#1e3a5f}

/* 用户菜单 */
.nav-user-menu{position:relative;display:none}
.nav-username{
    display:flex;align-items:center;gap:8px;
    padding:4px 12px 4px 4px;border-radius:24px;
    background:rgba(255,255,255,0.1);color:#fff;font-size:0.9rem;font-weight:600;
    cursor:pointer;transition:all .2s
}
.nav-user-menu.active .nav-username,.nav-user-menu:hover .nav-username{background:rgba(255,255,255,0.2)}
.nav-avatar{
    width:32px;height:32px;border-radius:50%;
    background:linear-gradient(135deg,#60a5fa,#3b82f6);
    display:flex;align-items:center;justify-content:center;
    font-size:0.85rem;font-weight:800;color:#fff;
    flex-shrink:0
}
.nav-username i{font-size:0.65rem;color:rgba(255,255,255,0.7)}
.dropdown-menu{
    position:absolute;top:calc(100% + 6px);right:0;
    background:#fff;border-radius:14px;
    box-shadow:0 12px 36px rgba(0,0,0,0.18);
    border:1px solid rgba(0,0,0,0.05);
    min-width:160px;padding:8px 0;
    display:none;z-index:50;pointer-events:auto
}
.dropdown-menu.show{display:block}
.dropdown-menu::before{
    content:'';position:absolute;top:-6px;right:20px;
    width:12px;height:12px;background:#fff;transform:rotate(45deg);
    border-left:1px solid rgba(0,0,0,0.05);border-top:1px solid rgba(0,0,0,0.05)
}
.dropdown-menu a,.dropdown-menu button{
    display:block;width:100%;text-align:left;padding:10px 18px;color:#475569;font-size:0.88rem;font-weight:500;
    text-decoration:none;transition:all .15s;border:none;background:none;cursor:pointer
}
.dropdown-menu a:hover,.dropdown-menu button:hover{background:#f8fafc;color:#2563eb}
.dropdown-menu a i,.dropdown-menu button i{width:18px;text-align:center;margin-right:8px;color:#94a3b8}
.dropdown-menu a:hover i,.dropdown-menu button:hover i{color:#2563eb}
.dropdown-divider{height:1px;background:#e2e8f0;margin:6px 10px}

/* 背景区 */
.page-bg{background:#93c5fd;min-height:calc(100vh - 60px);position:relative;overflow:hidden;padding:40px 24px 80px}

/* 主布局 */
.container{max-width:1200px;margin:0 auto}
.main-layout{display:grid;grid-template-columns:1fr 280px;gap:24px}

/* 课程卡片 */
.courses-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.course-card{background:#fff;border-radius:16px;border:1px solid #dbeafe;box-shadow:0 4px 16px rgba(37,99,235,0.08);overflow:hidden;cursor:pointer;transition:all .25s;text-decoration:none;color:inherit;display:block}
.course-card:hover{transform:translateY(-6px);box-shadow:0 12px 32px rgba(37,99,235,0.2);border-color:#93c5fd}
.course-img-wrap{width:calc(100% + 24px);aspect-ratio:16/10;border-radius:16px 16px 12px 12px;overflow:hidden;margin:-12px -12px 12px -12px;display:flex;align-items:center;justify-content:center;position:relative}
.course-bottom{display:flex;align-items:flex-start;justify-content:space-between;padding:12px}
.course-info{flex:1;min-width:0}
.course-title{font-size:16px;font-weight:700;color:#1e293b;margin-bottom:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;transition:color .3s}
.course-card:hover .course-title{color:#2563eb}
.course-desc{font-size:13px;color:#94a3af;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.course-progress{text-align:right;flex-shrink:0;margin-left:12px}
.course-count{font-size:14px;font-weight:600;color:#64748b;margin-bottom:5px}
.progress-track{width:80px;height:5px;background:#e2e8f0;border-radius:3px;overflow:hidden;margin-left:auto}
.progress-fill{height:100%;background:#2563eb;border-radius:3px}

/* 边栏 */
.sidebar{display:flex;flex-direction:column;gap:16px}
.side-card{background:#fff;border-radius:16px;padding:18px;box-shadow:0 4px 20px rgba(37,99,235,0.08);border:1px solid #dbeafe}
.side-card h3{font-size:0.95rem;font-weight:700;color:#1e293b;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.stat-mini{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.stat-box{text-align:center;padding:12px 8px;background:#eff6ff;border-radius:10px}
.stat-box .num{font-size:1.2rem;font-weight:800;color:#2563eb}
.stat-box .label{font-size:0.72rem;color:#64748b;margin-top:2px}
.rank-row{display:flex;align-items:center;gap:10px;padding:7px 0}
.rank-num{width:26px;height:26px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:0.78rem;font-weight:700;background:#e2e8f0;color:#64748b}
.rank-num.gold{background:linear-gradient(135deg,#fcd34d,#f59e0b);color:#fff}
.rank-num.silver{background:linear-gradient(135deg,#e5e7eb,#9ca3af);color:#fff}
.rank-num.bronze{background:linear-gradient(135deg,#fed7aa,#d97706);color:#fff}
.rank-name{flex:1;font-size:0.88rem;color:#1e293b}
.rank-score{font-size:0.85rem;color:#2563eb;font-weight:700}

/* 响应式 */
@media(max-width:1024px){.main-layout{grid-template-columns:1fr}.sidebar{display:none}}
@media(max-width:768px){.courses-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.courses-grid{grid-template-columns:1fr}}