* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "Microsoft YaHei", "PingFang SC", sans-serif; background: #f4f6fa; color: #333; line-height: 1.6; }
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
a { color: #2563eb; text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
header { background: linear-gradient(135deg, #1e3a8a, #3730a3); color: #fff; padding: 20px 0; }
header h1 { font-size: 1.6rem; margin-bottom: 6px; }
header p { opacity: 0.8; font-size: 0.9rem; margin-bottom: 12px; }
nav { display: flex; gap: 20px; flex-wrap: wrap; }
nav a { color: #fff; opacity: 0.75; font-weight: 500; padding: 4px 10px; border-radius: 6px; transition: all 0.2s; }
nav a:hover, nav a.active { opacity: 1; background: rgba(255,255,255,0.15); text-decoration: none; }

/* Main */
main { padding: 40px 20px; }

/* Hero */
.hero { text-align: center; padding: 40px 0; }
.hero h2 { font-size: 2rem; color: #1e3a8a; margin-bottom: 12px; }
.hero p { opacity: 0.7; font-size: 1.05rem; }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; margin: 30px 0; }
.card { background: #fff; border-radius: 12px; padding: 28px; box-shadow: 0 2px 12px rgba(0,0,0,0.07); transition: transform 0.2s; }
.card:hover { transform: translateY(-3px); }
.card h3 { font-size: 1.2rem; margin-bottom: 10px; }
.card p { opacity: 0.75; margin-bottom: 16px; font-size: 0.95rem; }
.btn { display: inline-block; background: #2563eb; color: #fff; padding: 8px 20px; border-radius: 8px; font-size: 0.9rem; transition: background 0.2s; }
.btn:hover { background: #1d4ed8; text-decoration: none; }

/* Quick Links */
.quick-links { margin-top: 50px; }
.quick-links h3 { font-size: 1.3rem; color: #1e3a8a; margin-bottom: 16px; }
.link-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.link-item { background: #fff; border-radius: 10px; padding: 20px; border-left: 4px solid #2563eb; box-shadow: 0 1px 6px rgba(0,0,0,0.05); }
.link-item p { margin: 6px 0 12px; opacity: 0.8; }
.link-item a { font-weight: 600; }

/* Page titles */
.page-title { font-size: 1.8rem; color: #1e3a8a; margin-bottom: 8px; }
.page-desc { opacity: 0.7; margin-bottom: 30px; }

/* Tutorial list */
.tutorial-list { display: flex; flex-direction: column; gap: 20px; }
.tutorial-card { background: #fff; border-radius: 12px; padding: 24px; box-shadow: 0 2px 10px rgba(0,0,0,0.06); }
.tutorial-card h3 { margin: 10px 0; color: #1e3a8a; }
.tutorial-card p { opacity: 0.8; margin-bottom: 14px; }
.tag { display: inline-block; background: #dbeafe; color: #1d4ed8; padding: 2px 10px; border-radius: 20px; font-size: 0.8rem; }

/* Links grid */
.links-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; margin-bottom: 30px; }
.link-card { background: #fff; border-radius: 12px; padding: 28px; box-shadow: 0 2px 12px rgba(0,0,0,0.07); }
.link-card h3 { margin: 10px 0; color: #1e3a8a; }
.link-card p { opacity: 0.75; margin-bottom: 18px; }
.platform { display: inline-block; padding: 2px 10px; border-radius: 20px; font-size: 0.8rem; font-weight: 600; }
.platform.ali { background: #fef3c7; color: #b45309; }
.platform.tencent { background: #dbeafe; color: #1d4ed8; }
.notice { background: #fffbeb; border: 1px solid #fcd34d; border-radius: 10px; padding: 16px 20px; color: #92400e; }

/* Messages */
.msg-form { background: #fff; border-radius: 12px; padding: 24px; margin-bottom: 30px; box-shadow: 0 2px 10px rgba(0,0,0,0.06); }
.msg-form input, .msg-form textarea { width: 100%; padding: 12px; border: 1px solid #e5e7eb; border-radius: 8px; font-size: 0.95rem; font-family: inherit; margin-bottom: 12px; }
.msg-form textarea { height: 100px; resize: vertical; }
.msg-list { display: flex; flex-direction: column; gap: 14px; }
.msg-item { background: #fff; border-radius: 10px; padding: 18px 20px; box-shadow: 0 1px 6px rgba(0,0,0,0.05); }
.msg-header { display: flex; justify-content: space-between; margin-bottom: 8px; }
.msg-name { font-weight: 600; color: #1e3a8a; }
.msg-time { color: #9ca3af; font-size: 0.85rem; }
.msg-content { opacity: 0.85; }
.empty { text-align: center; opacity: 0.5; padding: 40px; }

/* Footer */
footer { background: #1e3a8a; color: rgba(255,255,255,0.6); text-align: center; padding: 20px 0; margin-top: 60px; font-size: 0.85rem; }
footer .footer-stats { margin-top: 6px; font-size: 0.8rem; opacity: 0.7; }