* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Segoe UI', system-ui, sans-serif; max-width: 1100px; margin: 0 auto; padding: 2rem 1.5rem; background: #f5f7fa; color: #1a2332; line-height: 1.7; }
h1 { font-size: 1.8rem; border-bottom: 3px solid #1a73e8; padding-bottom: .5rem; }
h2 { font-size: 1.3rem; color: #1a73e8; margin-top: 2.5rem; border-left: 4px solid #1a73e8; padding-left: .7rem; }
h3 { font-size: 1.1rem; margin-top: 1.8rem; color: #1a2332; }
h4 { font-size: 1rem; color: #444; margin: 1rem 0 .3rem; }
hr { border: none; border-top: 1px solid #dce1e8; margin: 2rem 0; }
p { margin: .5rem 0; }
table { border-collapse: collapse; width: 100%; margin: 1rem 0; font-size: .9rem; }
th, td { border: 1px solid #dce1e8; padding: .5rem .7rem; text-align: left; vertical-align: top; }
th { background: #1a2332; color: #fff; font-weight: 600; }
tr:nth-child(even) { background: #f0f2f5; }
ul, ol { padding-left: 1.2rem; }
li { margin-bottom: .3rem; }
code { background: #e8ecf1; padding: .15rem .4rem; border-radius: 3px; font-size: .85rem; }
pre { background: #1a2332; color: #f0f2f5; padding: 1rem; border-radius: 6px; overflow-x: auto; font-size: .82rem; }
pre code { background: transparent; color: inherit; padding: 0; }
a { color: #1a73e8; text-decoration: none; }
a:hover { text-decoration: underline; }
.tag { display: inline-block; padding: .15rem .6rem; border-radius: 3px; font-size: .75rem; font-weight: 600; margin-right: .3rem; }
.tag-green { background: #2d6a4f; color: #fff; }
.tag-amber { background: #e65100; color: #fff; }
.tag-red { background: #b71c1c; color: #fff; }
.tag-blue { background: #1a73e8; color: #fff; }
.tag-gray { background: #6c757d; color: #fff; }
.note { background: #fff3cd; border-left: 4px solid #ffc107; padding: .7rem 1rem; margin: 1rem 0; border-radius: 4px; }
.note-info { background: #d1ecf1; border-left-color: #17a2b8; }
.note-success { background: #d4edda; border-left-color: #28a745; }
.note-danger { background: #f8d7da; border-left-color: #dc3545; }
.note-amber { background: #fff3cd; border-left-color: #e65100; }
.top-nav { display: flex; gap: .5rem; margin: 1rem 0; flex-wrap: wrap; border-bottom: 2px solid #dce1e8; padding-bottom: .8rem; }
.top-nav a { padding: .4rem 1rem; border-radius: 6px; background: #e8ecf1; font-size: .85rem; font-weight: 600; }
.top-nav a:hover { background: #1a73e8; color: #fff; text-decoration: none; }
.top-nav a.current { background: #1a2332; color: #fff; }
.breadcrumb { font-size: .85rem; color: #6c757d; margin: .5rem 0; }
.breadcrumb a { color: #1a73e8; }
.breadcrumb a:hover { text-decoration: underline; }
.flow { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: .5rem; margin: 1.5rem 0; padding: 1rem; background: #fff; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,.08); }
.flow-box { background: #1a2332; color: #fff; padding: .6rem 1rem; border-radius: 6px; font-size: .85rem; text-align: center; min-width: 100px; }
.flow-box .sub { font-size: .7rem; color: #8a9bb5; }
.flow-arrow { font-size: 1.3rem; color: #1a73e8; font-weight: 700; }
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 1rem; margin: 1rem 0; }
.gal-item { background: #fff; border-radius: 6px; overflow: hidden; box-shadow: 0 1px 4px rgba(0,0,0,.08); }
.gal-item img { width: 100%; height: 140px; object-fit: cover; display: block; }
.gal-item .cap { padding: .4rem .6rem; font-size: .8rem; color: #333; }
.gal-item .cap small { color: #999; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 1rem 0; }
@media (max-width: 700px) { body { padding: 1rem; } .flow { flex-direction: column; } .flow-arrow { transform: rotate(90deg); } .grid-2 { grid-template-columns: 1fr; } }
.hero { text-align: center; padding: 3rem 1rem; background: linear-gradient(135deg, #1a2332 0%, #1a73e8 100%); color: #fff; border-radius: 12px; margin: 1rem 0; }
.hero h1 { font-size: 2.2rem; border: none; padding: 0; }
.hero p { font-size: 1.1rem; opacity: .9; margin-top: .5rem; }
.section-card { background: #fff; border-radius: 8px; padding: 1.5rem; box-shadow: 0 2px 8px rgba(0,0,0,.06); margin: 1.5rem 0; }
.section-card h2 { margin-top: 0; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 1rem; margin: 1rem 0; }
.stat-card { background: #fff; border-radius: 8px; padding: 1rem; box-shadow: 0 2px 6px rgba(0,0,0,.06); text-align: center; }
.stat-card .num { font-size: 1.6rem; font-weight: 700; color: #1a73e8; }
.stat-card .label { font-size: .8rem; color: #666; }
.problem-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1rem; margin: 1rem 0; }
.prob-card { background: #fff; border-radius: 8px; padding: 1rem; box-shadow: 0 1px 4px rgba(0,0,0,.08); border-top: 4px solid #1a73e8; }
.prob-card .title { font-weight: 700; font-size: .95rem; }
.prob-card .desc { font-size: .82rem; color: #555; margin-top: .3rem; }
.prob-card .meta { font-size: .75rem; color: #999; margin-top: .5rem; }
.footer { text-align: center; color: #999; font-size: .8rem; padding-top: 2rem; margin-top: 2rem; border-top: 1px solid #dce1e8; }