:root{--ink:#1d2957;--muted:#64708d;--paper:#faf9f5;--line:#e7e5dd;--orange:#ff8b58;--blue:#88b5d9;--mint:#9ccfbb;--shadow:0 12px 34px rgba(29,41,87,.09)}*{box-sizing:border-box}body{margin:0;background:#e9edf1;color:var(--ink);font-family:Inter,"PingFang SC","Microsoft YaHei",sans-serif}.app-shell{position:relative;margin:0 auto;min-height:100vh;max-width:480px;padding:26px 20px 118px;background:var(--paper);overflow:hidden}.topbar,.section-header,.card-head,.profile-intro,.post-user,.coach-header,.coach-header>div{display:flex;align-items:center}.topbar,.section-header{justify-content:space-between}.brand{display:flex;gap:9px;align-items:center;font-size:18px;letter-spacing:-.4px}.brand 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