:root{--bg-top: #fdf6ef;--bg-bot: #eaf3ee;--surface: #ffffff;--accent: #35a37d;--accent-deep: #2b8a69;--accent-soft: #dff0e8;--client-bubble: #d8efe3;--ai-bubble: #ffffff;--text: #2b3038;--muted: #8b93a1;--danger: #e0674f;--danger-soft: #fdeae5;--line: #ecefee;--shadow: 0 6px 24px rgba(53, 120, 95, .1);font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,system-ui,sans-serif;color:var(--text)}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body{margin:0;height:100%}body{background:linear-gradient(165deg,var(--bg-top),var(--bg-bot));background-attachment:fixed}button{font-family:inherit}input,select{font-family:inherit;font-size:16px}.screen{display:flex;flex-direction:column;height:100vh;max-width:600px;margin:0 auto}.login{align-items:center;justify-content:center;padding:24px}.login-card{background:var(--surface);border-radius:24px;padding:40px 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