:root{--color-bg: #f7f8fa;--color-surface: #ffffff;--color-border: #e2e5ea;--color-text: #1a1d23;--color-text-secondary: #666e7d;--color-primary: #2757e8;--color-primary-hover: #1d45c4;--color-danger: #d92d20;--color-success: #12805c;--color-warning: #b25e09;--radius: 10px;--shadow-sm: 0 1px 2px rgba(16, 24, 40, .06);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--color-bg);color:var(--color-text)}a{color:var(--color-primary)}h1,h2,h3{margin:0 0 .5em;font-weight:600}.app-shell{display:flex;flex-direction:column;min-height:100%}.topbar{display:flex;align-items:center;gap:24px;padding:0 20px;height:56px;background:var(--color-surface);border-bottom:1px solid var(--color-border);position:sticky;top:0;z-index:10}.topbar-brand{font-weight:700;font-size:17px;white-space:nowrap}.topbar-nav{display:flex;gap:4px;flex:1;overflow-x:auto}.nav-link{padding:8px 12px;border-radius:8px;color:var(--color-text-secondary);text-decoration:none;font-size:14px;white-space:nowrap}.nav-link:hover{background:var(--color-bg);color:var(--color-text)}.nav-link-active{background:#ebf0fe;color:var(--color-primary);font-weight:600}.topbar-right{display:flex;align-items:center;gap:12px;white-space:nowrap}.topbar-user{font-size:14px;color:var(--color-text-secondary)}.fencer-select{font-size:13px;padding:4px 8px;border-radius:6px;border:1px solid var(--color-border);background:var(--color-surface)}.app-main{flex:1;width:100%;max-width:1080px;margin:0 auto;padding:24px 20px 64px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:9px 16px;border-radius:8px;border:1px solid transparent;font-size:14px;font-weight:600;cursor:pointer;background:var(--color-primary);color:#fff}.btn:hover{background:var(--color-primary-hover)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{background:var(--color-surface);color:var(--color-text);border-color:var(--color-border)}.btn-secondary:hover{background:var(--color-bg)}.btn-ghost{background:transparent;color:var(--color-text-secondary);border-color:var(--color-border)}.btn-ghost:hover{background:var(--color-bg)}.btn-danger{background:var(--color-danger)}.btn-danger:hover{background:#b3261e}.btn-sm{padding:5px 10px;font-size:13px}input[type=text],input[type=email],input[type=password],input[type=number],select,textarea{width:100%;padding:9px 12px;border-radius:8px;border:1px solid var(--color-border);font-size:14px;background:var(--color-surface);color:var(--color-text);font-family:inherit}input:focus,select:focus,textarea:focus{outline:2px solid var(--color-primary);outline-offset:0}label{display:block;font-size:13px;font-weight:600;margin-bottom:6px;color:var(--color-text-secondary)}.field{margin-bottom:16px}.centered-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}.auth-card{width:100%;max-width:380px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);padding:32px;box-shadow:var(--shadow-sm)}.auth-card h1{font-size:20px;text-align:center;margin-bottom:24px}.auth-links{margin-top:16px;text-align:center;font-size:13px;color:var(--color-text-secondary)}.page-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;gap:12px;flex-wrap:wrap}.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow-sm);margin-bottom:20px}.card h2{font-size:16px}.grid{display:grid;gap:16px}.grid-2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}.grid-3{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}.empty-state{text-align:center;color:var(--color-text-secondary);padding:48px 16px}.error-text{color:var(--color-danger);font-size:13px;margin-top:8px}.success-text{color:var(--color-success);font-size:13px;margin-top:8px}.badge{display:inline-flex;align-items:center;padding:2px 8px;border-radius:999px;font-size:12px;font-weight:600;background:var(--color-bg);color:var(--color-text-secondary)}.badge-success{background:#e6f4ef;color:var(--color-success)}.badge-warning{background:#fbf0e2;color:var(--color-warning)}.badge-danger{background:#fbe9e8;color:var(--color-danger)}.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}.video-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);overflow:hidden;cursor:pointer;text-decoration:none;color:inherit;display:block}.video-thumb{width:100%;aspect-ratio:16 / 9;background:#dde1e8;object-fit:cover;display:block}.video-card-body{padding:12px 14px}.video-card-title{font-weight:600;font-size:14px;margin-bottom:4px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.video-card-meta{font-size:12px;color:var(--color-text-secondary);display:flex;justify-content:space-between}.progress-bar-track{width:100%;height:6px;border-radius:999px;background:var(--color-border);overflow:hidden}.progress-bar-fill{height:100%;background:var(--color-primary)}.list-row{display:flex;align-items:center;justify-content:space-between;padding:12px 0;border-bottom:1px solid var(--color-border)}.list-row:last-child{border-bottom:none}.coaching-moment{border-left:3px solid var(--color-border);padding:8px 12px;margin-bottom:8px;border-radius:0 6px 6px 0;background:var(--color-bg)}.coaching-moment-good{border-left-color:var(--color-success)}.coaching-moment-improve{border-left-color:var(--color-warning)}