:root { --primary: #2196f3; --dark: #2c3e50; --bg: #f0f2f5; --white: #ffffff; --gray: #95a5a6; }
* { box-sizing: border-box; }
body { font-family: 'Inter', sans-serif; background: var(--bg); margin: 0; color: var(--dark); }
.container { max-width: 1000px; margin: 0 auto; padding: 20px; }

header { background: var(--white); padding: 15px 25px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.05); margin-bottom: 15px; }
.header-content { display: grid; grid-template-columns: 1fr 1.5fr 1.5fr; align-items: center; gap: 20px; }

.profile-info h1 { font-size: 1.4rem; margin: 0; color: var(--primary); }
.subtitle { font-size: 0.85rem; color: var(--gray); margin: 5px 0; }
.social-mini a { color: var(--dark); margin-right: 10px; font-size: 1.1rem; text-decoration: none; }

.stats-wrapper { display: flex; justify-content: space-around; border-left: 1px solid #eee; border-right: 1px solid #eee; }
.stat-box { text-align: center; }
.stat-label { display: block; font-size: 0.7rem; text-transform: uppercase; color: var(--gray); }
.stat-val { font-size: 1.2rem; font-weight: 700; color: var(--dark); }
.chart-mini { height: 100px; width: 100%; position: relative; }

.sticky-wrapper { position: sticky; top: 10px; z-index: 100; margin-bottom: 15px; }
.controls-area { background: rgba(255, 255, 255, 0.95); backdrop-filter: blur(10px); padding: 10px; border-radius: 8px; display: flex; gap: 10px; box-shadow: 0 4px 15px rgba(0,0,0,0.05); border: 1px solid rgba(0,0,0,0.05); }
.search-box, .filter-box { flex: 1; position: relative; }
input, select { width: 100%; padding: 10px 15px 10px 35px; border: 1px solid #ddd; border-radius: 6px; outline: none; font-size: 0.9rem; }
input:focus-visible, select:focus-visible { outline: 2px solid var(--primary); }
.search-box i { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: #aaa; }

.table-container { background: var(--white); border-radius: 10px; overflow-x: auto; box-shadow: 0 2px 5px rgba(0,0,0,0.03); }
table { width: 100%; border-collapse: collapse; min-width: 600px; }
th { background: #f8f9fa; padding: 12px 15px; text-align: left; font-size: 0.85rem; color: #666; font-weight: 600; cursor: pointer; user-select: none; }
th:hover { background: #eef; color: var(--primary); }
td { padding: 10px 15px; border-bottom: 1px solid #f1f1f1; font-size: 0.9rem; vertical-align: middle; }
tr:hover { background: #f9fbfc; }

.rating-badge { padding: 3px 8px; border-radius: 4px; font-weight: 700; font-size: 0.8rem; }
.lvl-newbie { background: #eee; color: #666; }
.lvl-green { background: #e8f5e9; color: #2e7d32; }
.lvl-cyan { background: #e0f7fa; color: #00838f; }
.lvl-blue { background: #e3f2fd; color: #1565c0; }
.lvl-violet { background: #f3e5f5; color: #7b1fa2; }
.tag { font-size: 0.75rem; background: #f1f1f1; padding: 2px 6px; border-radius: 4px; color: #555; margin-right: 4px; display: inline-block; margin-bottom: 2px;}

.center-align { text-align: center; }
.action-btn { display: inline-flex; align-items: center; gap: 5px; text-decoration: none; padding: 4px 8px; border-radius: 4px; font-size: 0.75rem; font-weight: 600; transition: 0.2s; }
.btn-problem { background: #fff; border: 1px solid #ddd; color: #555; margin-right: 5px; }
.btn-problem:hover { border-color: var(--dark); color: var(--dark); }
.btn-sol { background: var(--primary); color: white; border: 1px solid var(--primary); }
.btn-sol:hover { background: #1976d2; }

footer { text-align: center; margin-top: 30px; padding: 20px; color: #888; font-size: 0.85rem; }
.footer-links a { color: var(--primary); text-decoration: none; margin: 0 5px; font-weight: 500; }
.footer-links a:hover { text-decoration: underline; }

@media (max-width: 1024px) { .header-content { grid-template-columns: 1fr 1fr; } }
@media (max-width: 700px) { .header-content { grid-template-columns: 1fr; text-align: center; gap: 10px; } .stats-wrapper { margin: 10px 0; } .controls-area { flex-direction: column; } }