:root{--bg:#f5f7fa;--surface:#fff;--surface-2:#f9fafb;--border:#e5e7eb;--border-strong:#d1d5db;--text:#111827;--text-soft:#374151;--muted:#6b7280;--muted-soft:#9ca3af;--primary:#2563eb;--primary-hover:#1d4ed8;--primary-soft:#eff6ff;--success:#047857;--success-soft:#ecfdf5;--warn:#b45309;--warn-soft:#fffbeb;--danger:#b91c1c;--danger-soft:#fef2f2;--info:#0369a1;--info-soft:#f0f9ff;--shadow-sm:0 1px 2px rgba(15,23,42,.04);--shadow-md:0 1px 3px rgba(15,23,42,.06),0 1px 2px rgba(15,23,42,.04)}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Pretendard,Apple SD Gothic Neo,Noto Sans KR,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}main{max-width:880px;margin:0 auto;padding:40px 20px 80px}.hero{margin-bottom:28px}.hero h1{font-size:26px;margin:0 0 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(max-width:640px){main{padding:28px 16px 60px}.hero h1{font-size:22px}.clock-row{grid-template-columns:1fr}.form{flex-direction:column}.field input[type=datetime-local],.field input[type=text],.form input[type=text]{width:100%}.form-actions{justify-content:stretch}.btn-primary{padding:12px 18px;width:100%}.result-grid{grid-template-columns:1fr}.confidence-row,.countdown-header{flex-direction:column;align-items:flex-start}.countdown-number{font-size:clamp(36px,12vw,56px)}.click-guidance-grid{grid-template-columns:1fr}.ad-slot{min-height:72px}}